feat: 集成 rtsp-client-android 零缓冲 RTSP 渲染，替换 ExoPlayer

- 新增本地模块 rtspclientlibrary/（拷贝自 rtsp-client-android v5.6.5 library-client-rtsp）
- RtspVideoPlayer.kt 重写：RtspSurfaceView + AndroidView，VideoCodec 枚举映射
  DecoderType.HARDWARE/SOFTWARE；指数退避自动重连（1s→30s，URL/codec 变化重置）
- 延迟统计：每 2s 轮询 statistics 输出 videoDecoderLatencyMsec/networkLatencyMsec
- 本地修复两个已知坑：CSD 参数集顺序 sps+pps+vps -> vps+sps+pps（H.265 起播黑屏根因），
  codecType 硬编码 H264 -> 按实际 MIME 标记（H.265 宽高解析）
- FrameQueue 60 -> 20 压低积压延迟；剔除 camera 依赖（删除 bitmap 渲染路径）
- app 移除 media3-exoplayer-rtsp/ui 依赖（media3-exoplayer 由库模块提供）

.gitignore

@@ -13,3 +13,4 @@
 .externalNativeBuild
 .cxx
 local.properties
+build/

.idea/markdown.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <option name="previewPanelProviderInfo">
+      <ProviderInfo name="Compose (experimental)" className="com.intellij.markdown.compose.preview.ComposePanelProvider" />
+    </option>
+  </component>
+</project>

AGENTS.md

@@ -35,9 +35,9 @@ com.example.m20_gamepad/
 │       └── StatusReports.kt     # 下行状态结构（基础状态、运控状态、设备状态等）
 ├── service/
 │   ├── RobotConnection.kt       # 连接状态机管理（连接/订阅/心跳/断线判定）
-│   └── JoystickController.kt    # 摇杆输入 → 协议指令映射
+│   └── JoystickController.kt    # 摇杆输入 → 协议指令映射，含 HandStyle 多手型支持
 ├── video/
-│   └── RtspSurfaceView.kt       # RTSP 视频流播放（SurfaceView 层）
+│   └── RtspVideoPlayer.kt       # RTSP 视频流播放（rtspclientlibrary + Composable 包装）
 ├── data/
 │   ├── SettingsRepository.kt    # 设置项读写（DataStore 封装）
 │   └── AppSettings.kt           # 配置数据类定义 + 默认值
@@ -52,12 +52,12 @@ com.example.m20_gamepad/
 - **Header 结构**: `Sync(0xEB 91 EB 90) | Length(u16 LE) | MsgId(u16 LE) | Format(0x01) | Reserved(7字节)`
 - **ASDU 固定外层**: `{"PatrolDevice": {"Type": int, "Command": int, "Time": "YYYY-MM-DD HH:mm:ss", "Items": {}}}`
 - **关键指令**:
-  - 心跳: Type=100, Cmd=100, ≥1 Hz
+  - 心跳：Type=100, Cmd=100, ≥1 Hz
-  - 轴指令: Type=2, Cmd=21, Items: {X,Y,Z,Roll,Pitch,Yaw}, [-1,1], ≥20 Hz
+  - 轴指令：Type=2, Cmd=21, Items: {X,Y,Z,Roll,Pitch,Yaw}, [-1,1], ≥20 Hz
-  - 速度指令: Type=2, Cmd=25, Items: {X,Y,Z,Roll,Pitch,Yaw}, 物理单位, ≥10 Hz
+  - 速度指令：Type=2, Cmd=25, Items: {X,Y,Z,Roll,Pitch,Yaw}, 物理单位，≥10 Hz
-  - 运动状态转换: Type=2, Cmd=22, Items: {MotionParam}
+  - 运动状态转换：Type=2, Cmd=22, Items: {MotionParam}
-  - 步态切换: Type=2, Cmd=23, Items: {GaitParam}
+  - 步态切换：Type=2, Cmd=23, Items: {GaitParam}
-  - 使用模式切换: Type=1101, Cmd=5, Items: {Mode}
+  - 使用模式切换：Type=1101, Cmd=5, Items: {Mode}
 - **状态上报**: 上行响应含 ErrorCode/ErrorMessage; 主动订阅制（Type=1002, Cmd=3/4/5/6）
 
 ---
@@ -91,18 +91,60 @@ Joystick(
 - 角度 270° = 正下 → X 负方向（后退）
 - 强度百分比 → [-1, 1] 比例值
 
-**映射公式（从左摇杆角度/强度到 X/Y）**:
+**标准手型（STANDARD）**：
 ```
-val x = power / 100.0 * cos(angle)   // 垂直分量
+左摇杆: X = sin(angle) * power/100,  Y = cos(angle) * power/100
-val y = power / 100.0 * sin(angle)   // 水平分量
+右摇杆: Yaw = cos(angle) * power/100
+```
+
+**单摇杆左（SINGLE_LEFT）**：左摇杆控制 X(前后) + Yaw(转向，类车操控)，右摇杆仅控制 Y(横移)
+
+**单摇杆右（SINGLE_RIGHT）**：左摇杆仅控制 Y(横移)，右摇杆控制 X(前后) + Yaw(转向，类车操控)
+
+**坦克式（TANK）**：两摇杆 up/down 差速计算 X/Yaw，无横移 Y
+```
+左履带 = sin(leftAngle) * leftScale
+右履带 = sin(rightAngle) * rightScale
+X = (左履带 + 右履带) / 2
+Yaw = (左履带 - 右履带) / 2
 ```
-右摇杆控制 Yaw（偏航角速度）。
 
 ---
 
 ## RTSP 视频流
 
-使用 `MediaPlayer` + `SurfaceView` 或 `ExoPlayer` 拉取 RTSP 流。视频层作为 UI 最底层背景，摇杆等控件覆盖其上（半透明）。
+视频层作为 UI 最底层背景，摇杆等控件覆盖其上（半透明）。
+
+### 当前实现（已集成 rtsp-client-android）
+
+- 本地模块 **`rtspclientlibrary/`**（拷贝自 rtsp-client-android v5.6.5 的 `library-client-rtsp`），实现见 `video/RtspVideoPlayer.kt`（Compose 包装 `RtspSurfaceView` + AndroidView）
+- 架构：RTSP **仅 TCP interleaved**（无 UDP）→ RTP 解析（H.264/H.265）→ `FrameQueue(20)` → MediaCodec 直解 → 立即渲染。**无播放时钟 pacing，帧到即解即渲染** = 零缓冲低延迟
+- `VideoCodec` 枚举（AUTO/FORCE_HW/FORCE_SW_H264/FORCE_SW_H265）→ `DecoderType.HARDWARE/SOFTWARE`（库仅区分硬/软解，FORCE_SW_* 不支持按 MIME 分别指定）
+- 自动重连：指数退避 1s→30s（URL/codec 变化重置）；`RtspSurfaceView` 无内置重连，重连逻辑在 Composable 层
+- 延迟统计：轮询 `rtspView.statistics` 每 2s 输出 `videoDecoderLatencyMsec`/`networkLatencyMsec` 到 Logcat（tag `RtspVideoPlayer`）
+- 本地修改（相对上游）：
+  - **CSD 参数集顺序修正**：`vps+sps+pps`（上游为 `sps+pps+vps`，H.265 起播黑屏根因）
+  - **codecType 按实际 MIME 标记**（上游硬编码 H264，H.265 无法解析宽高）
+  - **`FrameQueue(60)` → `FrameQueue(20)`**（压低积压延迟）
+  - 剔除 camera 依赖（删除 `RtspImageView`/bitmap 渲染路径，仅保留 SurfaceView 路径）
+
+### 延迟问题与决策（2026-08 调研结论）
+
+- 现象：RTSP/TCP 延迟高、缓冲大；H.265 解码不高效
+- **根因**：不是解码器也不是 TCP 协议本身，而是 ExoPlayer 播放器架构（缓冲水位 + presentationTime pacing 渲染同步）为"平滑播放"设计，非实时
+- **决策**：弃用 ExoPlayer 的视频渲染路径，集成第三方库 **rtsp-client-android**（alexeyvasilyev，v5.6.5，纯 Kotlin 零缓冲直出架构）
+- 上游源码备份：`/tmp/rtsp-client-android`（工作区外临时目录）；本地拷贝见 `rtspclientlibrary/`
+
+### rtsp-client-android 关键技术要点（集成时必读）
+
+- 架构：RTSP **仅 TCP interleaved**（无 UDP）→ RTP 解析（H.264/H.265）→ `FrameQueue` → MediaCodec 直解 → 立即渲染。**无播放时钟 pacing，帧到即解即渲染** = 零缓冲低延迟（宣传 20ms 解码延迟）
+- H.265：`RtpH265Parser` 支持 single NAL + FU 分片重组；**AP 聚合包未实现**（有 TODO）
+- 硬解优先，`MediaCodecUtils.getLowLatencyDecoder` 挑专用低延迟解码器，失败自动回退软解；`MediaCodecHelper.setDecoderLowLatencyOptions` 设 `KEY_LOW_LATENCY`
+- 实验性 SPS 改写（仅 H.264）：`maxDecFrameBuffering=1, numReorderFrames=0`，可砍半部分硬解器延迟（已在 Composable 层开启）
+- **内置延迟统计**：`RtspSurfaceView.statistics` → `videoDecoderLatencyMsec`（解码渲染）+ `networkLatencyMsec`（网络），无需自写埋点
+- **已知坑（均已本地修复）**：`RtspProcessor` 拼 CSD 顺序为 `sps+pps+vps`（H.265 标准应为 VPS→SPS→PPS，本地已改）；`codecType` 硬编码 H264（本地已按 MIME 修正）
+- 依赖：`androidx.media3:media3-exoplayer`（仅用工具类 NalUnitUtil/MediaCodecUtil）、`org.jcodec`（SPS 改写）；已剔除 `androidx.camera`（YUV→BMP 路径，本项目用 SurfaceView 直出无需）
+- 库活跃：2026-06 更新（v5.6.5），全库约 6300 行，无 JNI/无预编译 so，全量可改
 
 ---
 
@@ -117,6 +159,7 @@ val y = power / 100.0 * sin(angle)   // 水平分量
 | `rtsp_url` | String | `rtsp://10.21.31.103:554/stream` | RTSP 视频流地址 |
 | `video_codec` | Enum | `AUTO` | `AUTO` / `FORCE_HW` / `FORCE_SW_H264` / `FORCE_SW_H265` |
 | `video_resize_mode` | Enum | `ZOOM` | `FIT` / `ZOOM` / `FILL` |
+| `hand_style` | Enum | `STANDARD` | `STANDARD` / `SINGLE_LEFT` / `SINGLE_RIGHT` / `TANK` |
 
 ### 持久化
 
@@ -147,7 +190,7 @@ gradlew installDebug
 
 - 虚拟摇杆库：本地模块 `joysticklibrary/`（Compose 原生，Kotlin DSL）
 - JSON 序列化：`kotlinx-serialization-json:1.7.3`
-- RTSP 播放：`androidx.media3:media3-exoplayer-rtsp:1.5.1`
+- RTSP 播放：本地模块 `rtspclientlibrary/`（rtsp-client-android，内部依赖 `media3-exoplayer:1.5.1` + `jcodec:0.2.5`）
 - 持久化：`androidx.datastore:datastore-preferences:1.1.3`
 - 导航：`androidx.navigation:navigation-compose:2.8.6`
 
@@ -159,6 +202,7 @@ gradlew installDebug
 - **协程**: 网络 I/O 使用 `kotlinx.coroutines`，避免裸线程
 - **UDP**: 使用 `java.net.DatagramSocket`，绑定本地随机端口
 - **状态管理**: 使用 `StateFlow` 暴露连接状态、机器人状态
+- **状态上报合并策略**: `handleStatusReport` 对 `_latestStatus` 采用合并（`prev.copy`）而非替换，避免 4 个独立订阅（Basic/Error/Motion/Device）的局部报告覆盖整个状态导致 UI 闪烁。各分项（`batteryStatus`、`motionStatus` 等）同时维护独立 StateFlow，供 UI 直接订阅
 - **生命周期**: 网络连接生命周期绑定到 Activity/Service，前台时活跃
 - **MsgId**: 从 0 递增 u16，循环回绕
 - **断线判定**: 收到首个有效数据包前为 `CONNECTING`（5 秒无数据 → `TIMEOUT`）；`CONNECTED` 后 3 秒无任何 UDP 包 → `TIMEOUT`
@@ -167,10 +211,9 @@ gradlew installDebug
 
 ## 已完成 / 待办
 
-### 已完成
+## 已完成 / 待办
 
-- [x] Gradle 配置：版本目录、摇杆本地模块、全部依赖
+见 [TODO.md](./TODO.md)
-- [x] 协议层：Header.kt（16 字节小端编解码）
 - [x] 协议层：ApduMessage.kt（Header + ASDU 封装）
 - [x] 协议层：ControlCommands.kt（全部指令构建函数 + 常量）
 - [x] 协议层：StatusReports.kt（全部状态上报数据类 + JSON 解析器）
@@ -213,7 +256,13 @@ gradlew installDebug
 - [x] 状态机补充：`RobotConnection` 允许 `CONNECTING → TIMEOUT` 合法转换
 - [x] 心跳启动时机修复：`ProtocolClient.connect()` 立即启动心跳线程，不再等待首次收到数据包后才启动；心跳在 `CONNECTING` 和 `CONNECTED` 状态下均正常运行
 - [x] 软急停滑块：右上角新增平行四边形水平滑块，滑到右侧触发软急停（`MOTION_DAMPING`），跟随机器人状态上报自动归位
+- [x] 状态上报闪烁修复：`_latestStatus` 改用合并策略（`prev.copy`），保留上次报告的非 null 字段，避免 4 个独立订阅交替覆盖导致状态栏/步态按钮闪烁
+- [x] 电量显示稳定性优化：`StatusBar` 电量改用独立 `batteryStatus` StateFlow，不依赖 `status?.batteryStatus`
+- [x] 休眠按钮状态约束：仅非站立状态（空闲/趴下/阻尼等）可切换休眠，站立/RL 控制时禁用
+- [x] RTSP 自动重连：`RtspVideoPlayer` 播放失败后自动重试，指数退避（初始 1s，最大 30s，倍率 2），URL/解码器变化时重置退避状态；覆盖层显示重试次数和倒计时
+- [x] 订阅请求清理：删除 `ProtocolClient.sendSubscriptionRequests()` 方法及 `connect()` 中的注释调用；同步删除 `ControlCommands.subscribeStatus()` 和 `SUB_*` 常量，彻底清除死代码
+- [x] 摇杆手型支持：`HandStyle` 枚举（标准/单摇杆左/单摇杆右/坦克式），映射到 `JoystickController.dualStickToAxisCommand()`，设置界面持久化存储，实时生效
 
 ### 待办
 
-- [ ] 视频进一步延迟优化：探索更激进的低延迟策略（如降低帧率、缩小分辨率、调整 ExoPlayer 缓冲策略等）
+见 [TODO.md](./TODO.md)

TODO.md

@@ -0,0 +1,70 @@
+# TODO
+
+## 待办
+
+### 视频低延迟改造（进行中，分支 feature/rtsp-low-latency）
+
+- [x] 集成 rtsp-client-android：将 `/tmp/rtsp-client-android/library-client-rtsp` 拷贝为本地模块（`rtspclientlibrary/`），替换 ExoPlayer 视频渲染（含 CSD 顺序 vps+sps+pps 修复、codecType 按 MIME 修正、FrameQueue 60→20、剔除 camera 依赖）
+- [x] Compose 封装：`RtspSurfaceView` 包 `AndroidView`，替换 `video/RtspVideoPlayer.kt` 的 `PlayerView`；`VideoCodec` 枚举映射到 `DecoderType.HARDWARE/SOFTWARE`，设置界面 `video_codec` 选项复用
+- [x] 保留 RTSP 自动重连：移植现有指数退避逻辑（1s→30s，URL/codec 变化重置）
+- [x] 接入延迟统计：`RtspSurfaceView.statistics` 的 `videoDecoderLatencyMsec`/`networkLatencyMsec` 每 2s 输出 Logcat（tag `RtspVideoPlayer`）验证延迟改善
+- [x] 起播黑屏排查：`RtspProcessor` CSD 拼装顺序已修正为 VPS→SPS→PPS，codecType 已按实际 MIME 标记
+- [x] 可选：`FrameQueue(60)` 改小（20）进一步压缓冲；剔除 camera 依赖（删除 bitmap 渲染路径，保留 media3/jcodec）
+- [ ] 删除 ExoPlayer RTSP 依赖与 `RtspVideoPlayer.kt` 旧实现（保留 `VideoCodec`/`VideoResizeMode` 枚举迁移）——已删除 app 侧 media3 依赖与旧实现，待实机验证后合并
+
+### 其他
+
+- [ ] 视频进一步延迟优化：探索更激进的低延迟策略（跳过 Media3 ExoPlayer，直接使用 MediaCodec + SurfaceView）——已由上方 rtsp-client-android 集成方案承接
+
+## 已完成
+
+- [x] Gradle 配置：版本目录、摇杆本地模块、全部依赖
+- [x] 协议层：Header.kt（16 字节小端编解码）
+- [x] 协议层：ApduMessage.kt（Header + ASDU 封装）
+- [x] 协议层：ControlCommands.kt（全部指令构建函数 + 常量）
+- [x] 协议层：StatusReports.kt（全部状态上报数据类 + JSON 解析器）
+- [x] 协议层：PacketEncoder.kt（MsgId 管理 + APDU 编码）
+- [x] 协议层：PacketDecoder.kt（APDU 解码 + 缓冲区搜索）
+- [x] 网络层：ProtocolClient.kt（UDP socket、心跳 1Hz、指令发送通道、接收循环、断线检测 3s、订阅触发）
+- [x] 摇杆映射：JoystickController.kt（angle/power -> X/Y/Yaw）
+- [x] 状态管理：MainViewModel.kt（ProtocolClient 生命周期、20Hz 轴指令循环、状态收集）
+- [x] 视频播放：RtspVideoPlayer.kt（Media3 ExoPlayer RTSP，Composable 包装）
+- [x] 主界面：MainScreen.kt（视频背景 + 双摇杆 + 状态栏 + 控制按钮）
+- [x] 入口：MainActivity.kt + INTERNET 权限
+- [x] 持久化层：AppSettings.kt（配置数据类 + 默认值 + 校验）、SettingsRepository.kt（DataStore Preferences 封装，`settings: Flow<AppSettings>` + 单项 setter + `setAll()`）、M20App.kt（Application 子类，进程级 `settingsRepository` 单例）
+- [x] 设置界面 UI：SettingsScreen.kt（主机/端口/RTSP 输入 + 编码器 ExposedDropdownMenu，保存按钮调用 `setAll` 后回调 `onSaved`）
+- [x] 导航框架：NavRoutes.kt（`MAIN`/`SETTINGS` 路由常量）、MainActivity.kt 改写为 `AppNavGraph()`（NavHost，startDestination=MAIN，主界面齿轮按钮跳转设置，返回/保存后 popBackStack 到 MAIN）
+- [x] 连接参数从设置读取：MainViewModel 构造注入 `SettingsRepository`，`settings: StateFlow<AppSettings>`（`stateIn(Eagerly)`），`connect()` 读取 `settings.value` 的 host/port；`init {}` 监听 host/port 变化（`distinctUntilChanged`）后断开当前连接，下次连接使用新参数（符合"修改设置后断开当前连接"约束）。移除 DEFAULT_HOST/DEFAULT_PORT/DEFAULT_RTSP_URL 硬编码
+- [x] 连接状态机：RobotConnection.kt（连接状态流转校验 `isValidConnectionTransition`，运动状态机 `requestMotionTransition` 按 proto.md 2.3 正向流程 `空闲->站立->RL控制` 校验；`canSwitchGait`/`canSendAxisCommand` 仅 RL 控制下放行；`MotionTransitionResult` 枚举反馈）。MainViewModel 经状态机校验后下发指令，轴指令循环非 RL 控制时发零速度
+- [x] 状态上报 UI 展示：StatusPanel.kt（异常列表+错误码映射 ErrorCodes.kt、运控状态 Roll/Pitch/Yaw/速度/高度、设备温度电机/驱动器最高温、电池左右电压/电量/温度），顶部状态栏 Info 按钮触发底部弹出面板；指令失败/状态机拒绝通过 Snackbar 反馈
+- [x] 更多控制按钮：Mode（常规/导航/辅助）、步态（基础/楼梯/平地敏捷/楼梯敏捷）、照明（前/后灯开/关）、充电（开始/结束）、休眠（休眠/唤醒）。底部控制区可纵向滚动，点击"更多"展开全部控制选项
+- [x] RTSP 解码器策略实现：`VideoCodec` 枚举含 `AUTO`/`FORCE_HW`/`FORCE_SW_H264`/`FORCE_SW_H265`；`toMediaCodecSelector()` 映射到对应 `MediaCodecSelector`；`DefaultLoadControl` 最小缓冲（100ms起播，总缓冲<500ms，无回退缓存，时间优先于大小阈值）；`FORCE_HW` 模式对所有 MIME 仅保留硬件加速解码器
+- [x] 摇杆尺寸增大：左右摇杆从 140dp 增大到 180dp，提升操控精度
+- [x] 视频缩放模式：`VideoResizeMode` 枚举（FIT/ZOOM/FILL），设置界面新增"视频缩放模式"下拉选项，持久化保存，实时生效
+- [x] 状态机修复：趴下状态下允许切换站立状态（机器人站立后自动进入 RL 控制，无需 App 下发）
+- [x] UI 布局：增加 bg1.png 作为底图，无视频流时显示（视频流播放时覆盖底图）
+- [x] UI 布局：开关灯合并为前灯/后灯两个按键，通过颜色（琥珀色=开/暗色=关）表示置位状态，配合机器人回报状态同步
+- [x] 状态栏：ICMP 延迟测量 + WiFi 信号强度图标显示，放置于连接状态文字右侧，延迟独立于连接生命周期
+- [x] UI 布局：StatusBar 背景延伸到屏幕顶端，视觉吸附优化（Box + Row 双层结构，背景填满状态栏区域）
+- [x] UI 布局：连接按钮合并到顶部 StatusBar 的 ConnectionIndicator，删除底部独立连接按钮
+- [x] UI 布局：ConnectionIndicator 改为按钮形态（Surface + 圆角边框），仅指示器区域可点击切换连接
+- [x] UI 布局：隐藏系统状态栏（WindowInsetsControllerCompat），压缩自定义 StatusBar 高度，扩展可视区域
+- [x] UI 布局：功能按钮均布在四周——左上角模式选择+步态切换+起立/趴下，右上角灯光+休眠+充电，充分利用屏幕空间，优化单手操作体验
+- [x] UI 布局：起立/趴下合并为切换按钮（琥珀色=站立时显示"趴下"，暗色=非站立时显示"起立"），移至左上角 StatusBar 下方
+- [x] UI 布局：模式选择器（常规/导航/辅助，3个互斥按钮，无缝隙，底色显示当前模式）移至左上角，位于起立/趴上方
+- [x] UI 布局：步态切换（基础/楼梯/平地敏捷/楼梯敏捷，4个互斥按钮，无缝隙）移至模式选择器下方，始终显示，仅普通模式+RL控制时可点击
+- [x] UI 布局：照明/休眠/充电移至右上角，紧凑排列（前灯后灯无缝隙一行，休眠/唤醒切换，充电/充电中切换）
+- [x] UI 布局：底部控制区移除"更多"展开区域，仅保留左右摇杆
+- [x] UI 布局：所有功能按钮统一使用平行四边形形状（左侧按钮斜边左下→右上，右侧按钮斜边左上→右下）
+- [x] UI 布局：所有控制按钮在未连接时灰色不可点击
+- [x] 连接状态准确性修复：`ProtocolClient` 收到首个有效数据包后才标记 `CONNECTED`，不再 socket 创建后立即标记；`CONNECTING` 状态 5 秒无响应自动超时回退 `TIMEOUT`
+- [x] 连接按钮交互优化：`CONNECTING` 状态下点击连接按钮仅断开回到 `DISCONNECTED`，不再自动重连，由用户手动再次点击发起重试
+- [x] 状态机补充：`RobotConnection` 允许 `CONNECTING → TIMEOUT` 合法转换
+- [x] 心跳启动时机修复：`ProtocolClient.connect()` 立即启动心跳线程，不再等待首次收到数据包后才启动；心跳在 `CONNECTING` 和 `CONNECTED` 状态下均正常运行
+- [x] 软急停滑块：右上角新增平行四边形水平滑块，滑到右侧触发软急停（`MOTION_DAMPING`），跟随机器人状态上报自动归位
+- [x] 状态上报闪烁修复：`_latestStatus` 改用合并策略（`prev.copy`），保留上次报告的非 null 字段，避免 4 个独立订阅交替覆盖导致状态栏/步态按钮闪烁
+- [x] 电量显示稳定性优化：`StatusBar` 电量改用独立 `batteryStatus` StateFlow，不依赖 `status?.batteryStatus`
+- [x] 休眠按钮状态约束：仅非站立状态（空闲/趴下/阻尼等）可切换休眠，站立/RL 控制时禁用
+- [x] RTSP 自动重连：`RtspVideoPlayer` 播放失败后自动重试，指数退避（初始 1s，最大 30s，倍率 2），URL/解码器变化时重置退避状态；覆盖层显示重试次数和倒计时
+- [x] 订阅请求清理：删除 `ProtocolClient.sendSubscriptionRequests()` 方法及 `connect()` 中的注释调用；同步删除 `ControlCommands.subscribeStatus()` 和 `SUB_*` 常量，彻底清除死代码
+- [x] 摇杆手型支持：`HandStyle` 枚举（标准/单摇杆左/单摇杆右/坦克式），映射到 `JoystickController.dualStickToAxisCommand()`，设置界面持久化存储，实时生效

app/build.gradle.kts

@@ -42,6 +42,7 @@ android {
 
 dependencies {
     implementation(project(":joysticklibrary"))
+    implementation(project(":rtspclientlibrary"))
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
     implementation(libs.androidx.activity.compose)
@@ -54,9 +55,6 @@ dependencies {
     implementation(libs.androidx.navigation.compose)
     implementation(libs.androidx.lifecycle.viewmodel.compose)
     implementation(libs.androidx.lifecycle.runtime.compose)
-    implementation(libs.androidx.media3.exoplayer)
-    implementation(libs.androidx.media3.exoplayer.rtsp)
-    implementation(libs.androidx.media3.ui)
     implementation(libs.kotlinx.serialization.json)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)

app/src/main/java/com/example/m20_gamepad/data/AppSettings.kt

@@ -1,5 +1,6 @@
 package com.example.m20_gamepad.data
 
+import com.example.m20_gamepad.service.HandStyle
 import com.example.m20_gamepad.video.VideoCodec
 
 /**
@@ -25,7 +26,8 @@ data class AppSettings(
     val robotPort: Int = DEFAULT_ROBOT_PORT,
     val rtspUrl: String = DEFAULT_RTSP_URL,
     val videoCodec: VideoCodec = VideoCodec.AUTO,
-    val videoResizeMode: VideoResizeMode = VideoResizeMode.ZOOM
+    val videoResizeMode: VideoResizeMode = VideoResizeMode.ZOOM,
+    val handStyle: HandStyle = HandStyle.STANDARD
 ) {
     companion object {
         const val DEFAULT_ROBOT_HOST = "10.21.41.1"

app/src/main/java/com/example/m20_gamepad/data/SettingsRepository.kt

@@ -7,6 +7,7 @@ import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.intPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
+import com.example.m20_gamepad.service.HandStyle
 import com.example.m20_gamepad.video.VideoCodec
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
@@ -35,7 +36,8 @@ class SettingsRepository(context: Context) {
             robotPort = prefs[KEY_PORT] ?: AppSettings.DEFAULT_ROBOT_PORT,
             rtspUrl = prefs[KEY_RTSP_URL] ?: AppSettings.DEFAULT_RTSP_URL,
             videoCodec = VideoCodec.entries.getOrElse(prefs[KEY_CODEC] ?: 0) { VideoCodec.AUTO },
-            videoResizeMode = VideoResizeMode.entries.getOrElse(prefs[KEY_RESIZE_MODE] ?: 1) { VideoResizeMode.ZOOM }
+            videoResizeMode = VideoResizeMode.entries.getOrElse(prefs[KEY_RESIZE_MODE] ?: 1) { VideoResizeMode.ZOOM },
+            handStyle = HandStyle.entries.getOrElse(prefs[KEY_HAND_STYLE] ?: 0) { HandStyle.STANDARD }
         )
     }
 
@@ -55,6 +57,10 @@ class SettingsRepository(context: Context) {
         dataStore.edit { it[KEY_CODEC] = codec.ordinal }
     }
 
+    suspend fun setHandStyle(handStyle: HandStyle) {
+        dataStore.edit { it[KEY_HAND_STYLE] = handStyle.ordinal }
+    }
+
     /** 一次性写入全部设置（用于设置界面保存按钮） */
     suspend fun setAll(settings: AppSettings) {
         dataStore.edit { prefs ->
@@ -63,6 +69,7 @@ class SettingsRepository(context: Context) {
             prefs[KEY_RTSP_URL] = settings.rtspUrl.trim()
             prefs[KEY_CODEC] = settings.videoCodec.ordinal
             prefs[KEY_RESIZE_MODE] = settings.videoResizeMode.ordinal
+            prefs[KEY_HAND_STYLE] = settings.handStyle.ordinal
         }
     }
 
@@ -72,5 +79,6 @@ class SettingsRepository(context: Context) {
         private val KEY_RTSP_URL = stringPreferencesKey("rtsp_url")
         private val KEY_CODEC = intPreferencesKey("video_codec")
         private val KEY_RESIZE_MODE = intPreferencesKey("video_resize_mode")
+        private val KEY_HAND_STYLE = intPreferencesKey("hand_style")
     }
 }

app/src/main/java/com/example/m20_gamepad/network/ProtocolClient.kt

@@ -130,9 +130,6 @@ class ProtocolClient(
                 }
             }
 
-            // 发送订阅请求（触发服务端 UDP 推送）
-            sendSubscriptionRequests()
-
             // 启动断线检测（立即开始，覆盖 CONNECTING 和 CONNECTED 状态）
             timeoutJob = scope.launch {
                 timeoutCheckLoop()
@@ -195,25 +192,6 @@ class ProtocolClient(
         socket = null
     }
 
-    /** 发送订阅请求 */
-    private fun sendSubscriptionRequests() {
-        val subscriptions: List<Pair<Int, Int>> = listOf(
-            ControlCommands.SUB_BASIC,
-            ControlCommands.SUB_MOTION_CONTROL,
-            ControlCommands.SUB_DEVICE,
-            ControlCommands.SUB_ERROR
-        )
-        val sock = socket ?: return
-        val addr = remoteAddress ?: return
-        for ((type, cmd) in subscriptions) {
-            try {
-                val json = ControlCommands.subscribeStatus(type, cmd)
-                val packet = encoder.encode(json)
-                sock.send(DatagramPacket(packet, packet.size, addr, port))
-            } catch (_: Exception) { }
-        }
-    }
-
     /** 接收循环 */
     private fun CoroutineScope.receiveLoop(sock: DatagramSocket) {
         val buffer = ByteArray(65535)

app/src/main/java/com/example/m20_gamepad/network/models/ControlCommands.kt

@@ -122,10 +122,6 @@ object ControlCommands {
     // ---- 2.10 休眠状态查询 ----
     fun querySleepStatus(time: String = now()): String = buildAsdu(type = 1101, command = 7, time = time)
 
-    // ---- 订阅状态上报 ----
-    fun subscribeStatus(type: Int, command: Int, time: String = now()): String =
-        buildAsdu(type = type, command = command, time = time)
-
     // ========== 常量 ==========
 
     // 运动状态常量
@@ -147,9 +143,4 @@ object ControlCommands {
     const val MODE_NAVIGATION = 1
     const val MODE_ASSIST = 2
 
-    // 订阅 Type/Command — 用于 subscribeStatus()
-    val SUB_ERROR = Pair(1002, 3)
-    val SUB_MOTION_CONTROL = Pair(1002, 4)
-    val SUB_DEVICE = Pair(1002, 5)
-    val SUB_BASIC = Pair(1002, 6)
 }

app/src/main/java/com/example/m20_gamepad/service/JoystickController.kt

@@ -4,6 +4,20 @@ import com.example.m20_gamepad.network.models.ControlCommands
 import kotlin.math.cos
 import kotlin.math.sin
 
+/**
+ * 手型（摇杆-轴映射模式）。
+ */
+enum class HandStyle {
+    /** 标准：左摇杆 X/Y, 右摇杆 Yaw */
+    STANDARD,
+    /** 单摇杆左：左摇杆 X/Yaw（类车）, 右摇杆 Y */
+    SINGLE_LEFT,
+    /** 单摇杆右：左摇杆 Y, 右摇杆 X/Yaw（类车） */
+    SINGLE_RIGHT,
+    /** 坦克式：两摇杆 up/down 差速 X/Yaw, 无 Y, cos 忽略 */
+    TANK
+}
+
 /**
  * 摇杆输入 -> 协议轴指令映射。
  *
@@ -15,39 +29,59 @@ import kotlin.math.sin
  *
  * 协议轴定义：
  * - X 正 = 前进，Y 正 = 左移，Yaw 正 = 逆时针（左转）
- *
- * 映射公式：
- * - 左摇杆 X(前后) = sin(angle) * power/100
- * - 左摇杆 Y(左右) = cos(angle) * power/100
- * - 右摇杆 Yaw     = cos(angle) * power/100
  */
 object JoystickController {
 
-    /** 左摇杆角度/强度 -> 轴指令 JSON（X=前后, Y=左右） */
+    /**
-    fun leftStickToAxisCommand(angle: Double, power: Double): String {
+     * 根据手型将双摇杆输入映射为轴指令 JSON。
-        val scale = power / 100.0
+     *
-        val x = sin(angle) * scale
+     * @param handStyle 当前手型
-        val y = cos(angle) * scale
+     * @param leftAngle 左摇杆角度（弧度）
-        return ControlCommands.axisCommand(x = x, y = y)
+     * @param leftPower 左摇杆强度（0-100）
-    }
+     * @param rightAngle 右摇杆角度（弧度）
-
+     * @param rightPower 右摇杆强度（0-100）
-    /** 右摇杆角度/强度 -> 轴指令 JSON（Yaw=偏航） */
+     */
-    fun rightStickToAxisCommand(angle: Double, power: Double): String {
-        val yaw = cos(angle) * power / 100.0
-        return ControlCommands.axisCommand(yaw = yaw)
-    }
-
-    /** 双摇杆合并 -> 轴指令 JSON（左摇杆控制 X/Y，右摇杆控制 Yaw） */
     fun dualStickToAxisCommand(
+        handStyle: HandStyle,
         leftAngle: Double, leftPower: Double,
         rightAngle: Double, rightPower: Double
     ): String {
         val leftScale = leftPower / 100.0
         val rightScale = rightPower / 100.0
+
+        return when (handStyle) {
+            HandStyle.STANDARD -> {
                 val x = sin(leftAngle) * leftScale
                 val y = cos(leftAngle) * leftScale
                 val yaw = cos(rightAngle) * rightScale
-        return ControlCommands.axisCommand(x = x, y = y, yaw = yaw)
+                ControlCommands.axisCommand(x = x, y = y, yaw = yaw)
+            }
+            HandStyle.SINGLE_LEFT -> {
+                // 左摇杆：X(前后) + Yaw(转向)，类车操控
+                val x = sin(leftAngle) * leftScale
+                val yaw = cos(leftAngle) * leftScale
+                // 右摇杆：Y(横移)，仅左右有效
+                val y = cos(rightAngle) * rightScale
+                ControlCommands.axisCommand(x = x, y = y, yaw = yaw)
+            }
+            HandStyle.SINGLE_RIGHT -> {
+                // 左摇杆：Y(横移)，仅左右有效
+                val y = cos(leftAngle) * leftScale
+                // 右摇杆：X(前后) + Yaw(转向)，类车操控
+                val x = sin(rightAngle) * rightScale
+                val yaw = cos(rightAngle) * rightScale
+                ControlCommands.axisCommand(x = x, y = y, yaw = yaw)
+            }
+            HandStyle.TANK -> {
+                // 左摇杆 up/down → 左履带，右摇杆 up/down → 右履带
+                // cos 方向忽略 → 仅 sin 参与
+                val leftTrack = sin(leftAngle) * leftScale
+                val rightTrack = sin(rightAngle) * rightScale
+                val x = (leftTrack + rightTrack) / 2.0
+                val yaw = (leftTrack - rightTrack) / 2.0
+                ControlCommands.axisCommand(x = x, yaw = yaw)
+            }
+        }
     }
 
     /** 零速度指令（松手时发送，保持连接活跃） */

app/src/main/java/com/example/m20_gamepad/ui/MainScreen.kt

@@ -171,6 +171,7 @@ fun MainScreen(
         StatusBar(
             connectionState = connectionState,
             status = status,
+            batteryStatus = batteryStatus,
             pingLatencyMs = pingLatencyMs,
             wifiSignalLevel = wifiSignalLevel,
             onStatusClick = { statusPanelVisible = true },
@@ -255,11 +256,13 @@ fun MainScreen(
                     viewModel.sendLightControl(ledStatus?.front ?: 0, if (backOn) 0 else 1)
                 }
             }
-            // 休眠/唤醒
+            // 休眠/唤醒 — 仅趴下/空闲等非站立状态可切换
             val isSleeping = status?.basicStatus?.sleep == 1
+            val canSleep = motionState != ControlCommands.MOTION_STAND &&
+                    motionState != ControlCommands.MOTION_RL_CONTROL
             SleepToggleButton(
                 isSleeping = isSleeping,
-                connected = connectionState == ProtocolClient.State.CONNECTED,
+                connected = connectionState == ProtocolClient.State.CONNECTED && canSleep,
                 onToggle = { viewModel.sendSleepSettings(!isSleeping) }
             )
             // 充电/结束充电
@@ -307,6 +310,7 @@ fun MainScreen(
 private fun StatusBar(
     connectionState: ProtocolClient.State,
     status: com.example.m20_gamepad.network.models.StatusReport?,
+    batteryStatus: com.example.m20_gamepad.network.models.BatteryStatus?,
     pingLatencyMs: Long?,
     wifiSignalLevel: Int,
     onStatusClick: () -> Unit,
@@ -340,7 +344,7 @@ private fun StatusBar(
             verticalAlignment = Alignment.CenterVertically,
             horizontalArrangement = Arrangement.spacedBy(16.dp)
         ) {
-            status?.batteryStatus?.let {
+            batteryStatus?.let {
                 val avgLevel = (it.batteryLevelLeft + it.batteryLevelRight) / 2
                 StatusChip("电量 ${avgLevel.toInt()}%")
             }

app/src/main/java/com/example/m20_gamepad/ui/MainViewModel.kt

@@ -229,7 +229,30 @@ class MainViewModel(
 
     /** 状态上报分发：更新机器人运动状态机 + 各分项缓存。 */
     private fun handleStatusReport(report: StatusReport) {
-        _latestStatus.value = report
+        // 合并：保留上次报告中非 null 的字段，避免部分报告覆盖导致 UI 闪烁
+        val prev = _latestStatus.value
+        _latestStatus.value = if (prev != null) {
+            prev.copy(
+                type = report.type,
+                command = report.command,
+                time = report.time,
+                errorCode = report.errorCode ?: prev.errorCode,
+                errorMessage = report.errorMessage ?: prev.errorMessage,
+                basicStatus = report.basicStatus ?: prev.basicStatus,
+                motionStatus = report.motionStatus ?: prev.motionStatus,
+                motorStatus = report.motorStatus ?: prev.motorStatus,
+                batteryList = report.batteryList ?: prev.batteryList,
+                batteryStatus = report.batteryStatus ?: prev.batteryStatus,
+                deviceTemperature = report.deviceTemperature ?: prev.deviceTemperature,
+                led = report.led ?: prev.led,
+                gps = report.gps ?: prev.gps,
+                devEnable = report.devEnable ?: prev.devEnable,
+                cpu = report.cpu ?: prev.cpu,
+                errorList = report.errorList ?: prev.errorList
+            )
+        } else {
+            report
+        }
         _lastUpdate.value = report.time
         robot.updateFromReport(report)
         report.errorList?.let { _errorList.value = it }
@@ -325,6 +348,7 @@ class MainViewModel(
                 if (c != null && c.isConnected) {
                     val cmd = if (robot.canSendAxisCommand) {
                         JoystickController.dualStickToAxisCommand(
+                            settings.value.handStyle,
                             leftAngle, leftPower,
                             rightAngle, rightPower
                         )

app/src/main/java/com/example/m20_gamepad/ui/SettingsScreen.kt

@@ -38,6 +38,7 @@ import androidx.compose.ui.unit.dp
 import com.example.m20_gamepad.data.AppSettings
 import com.example.m20_gamepad.data.SettingsRepository
 import com.example.m20_gamepad.data.VideoResizeMode
+import com.example.m20_gamepad.service.HandStyle
 import com.example.m20_gamepad.video.VideoCodec
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
@@ -67,6 +68,7 @@ fun SettingsScreen(
     var rtspUrl by remember { mutableStateOf(AppSettings.DEFAULT_RTSP_URL) }
     var codec by remember { mutableStateOf(VideoCodec.AUTO) }
     var resizeMode by remember { mutableStateOf(VideoResizeMode.ZOOM) }
+    var handStyle by remember { mutableStateOf(HandStyle.STANDARD) }
     var hostError by remember { mutableStateOf<String?>(null) }
     var portError by remember { mutableStateOf<String?>(null) }
     var initialized by remember { mutableStateOf(false) }
@@ -79,6 +81,7 @@ fun SettingsScreen(
             rtspUrl = s.rtspUrl
             codec = s.videoCodec
             resizeMode = s.videoResizeMode
+            handStyle = s.handStyle
             initialized = true
         }
     }
@@ -170,6 +173,12 @@ fun SettingsScreen(
                 modifier = Modifier.fillMaxWidth()
             )
 
+            HandStyleDropdown(
+                selected = handStyle,
+                onSelect = { handStyle = it },
+                modifier = Modifier.fillMaxWidth()
+            )
+
             Spacer(Modifier.padding(top = 8.dp))
 
             // ---- 操作按钮 ----
@@ -193,7 +202,8 @@ fun SettingsScreen(
                                     robotPort = port,
                                     rtspUrl = rtspUrl,
                                     videoCodec = codec,
-                                    videoResizeMode = resizeMode
+                                    videoResizeMode = resizeMode,
+                                    handStyle = handStyle
                                 )
                             )
                             onSaved()
@@ -330,3 +340,60 @@ private fun ResizeModeDropdown(
         }
     }
 }
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun HandStyleDropdown(
+    selected: HandStyle,
+    onSelect: (HandStyle) -> Unit,
+    modifier: Modifier = Modifier
+) {
+    var expanded by remember { mutableStateOf(false) }
+    val options = HandStyle.entries
+    val labels = mapOf(
+        HandStyle.STANDARD to "标准（左摇杆 X/Y，右摇杆 Yaw）",
+        HandStyle.SINGLE_LEFT to "单摇杆左（左摇杆 X/Yaw，右摇杆 Y）",
+        HandStyle.SINGLE_RIGHT to "单摇杆右（左摇杆 Y，右摇杆 X/Yaw）",
+        HandStyle.TANK to "坦克式（两摇杆差速，无横移）"
+    )
+
+    Column(modifier = modifier) {
+        Text(
+            text = "摇杆手型",
+            style = androidx.compose.material3.MaterialTheme.typography.titleSmall,
+            color = androidx.compose.material3.MaterialTheme.colorScheme.primary
+        )
+        Spacer(Modifier.padding(top = 4.dp))
+        ExposedDropdownMenuBox(
+            expanded = expanded,
+            onExpandedChange = { expanded = it }
+        ) {
+            OutlinedTextField(
+                value = labels[selected] ?: selected.name,
+                onValueChange = {},
+                readOnly = true,
+                singleLine = true,
+                trailingIcon = {
+                    ExposedDropdownMenuDefaults.TrailingIcon(expanded)
+                },
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .menuAnchor()
+            )
+            ExposedDropdownMenu(
+                expanded = expanded,
+                onDismissRequest = { expanded = false }
+            ) {
+                options.forEach { h ->
+                    DropdownMenuItem(
+                        text = { Text(labels[h] ?: h.name) },
+                        onClick = {
+                            onSelect(h)
+                            expanded = false
+                        }
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/example/m20_gamepad/video/RtspVideoPlayer.kt

@@ -1,12 +1,17 @@
 package com.example.m20_gamepad.video
 
+import android.net.Uri
+import android.util.Log
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
@@ -14,18 +19,18 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
 import androidx.compose.ui.viewinterop.AndroidView
-import androidx.media3.common.MediaItem
+import androidx.lifecycle.Lifecycle
-import androidx.media3.common.PlaybackException
+import androidx.lifecycle.LifecycleEventObserver
-import androidx.media3.common.Player
+import androidx.lifecycle.compose.LocalLifecycleOwner
-import androidx.media3.exoplayer.DefaultLoadControl
+import com.alexvas.rtsp.codec.VideoDecodeThread
-import androidx.media3.exoplayer.DefaultRenderersFactory
+import com.alexvas.rtsp.widget.RtspStatusListener
-import androidx.media3.exoplayer.ExoPlayer
+import com.alexvas.rtsp.widget.RtspSurfaceView
-import androidx.media3.exoplayer.mediacodec.MediaCodecInfo
-import androidx.media3.exoplayer.mediacodec.MediaCodecSelector
-import androidx.media3.ui.AspectRatioFrameLayout
-import androidx.media3.ui.PlayerView
 import com.example.m20_gamepad.data.VideoResizeMode
+import kotlinx.coroutines.delay
 
 /**
  * 视频解码器选择策略。
@@ -44,21 +49,32 @@ enum class VideoCodec {
 /** RTSP 播放状态 */
 sealed class RtspState {
     /** 连接中 */
-    object Connecting : RtspState()
+    data class Connecting(val retryCount: Int = 0) : RtspState()
     /** 播放中 */
     object Playing : RtspState()
-    /** 连接失败 */
+    /** 连接失败（自动重试中） */
-    data class Error(val message: String) : RtspState()
+    data class Error(val message: String, val retryCount: Int = 0, val nextRetryMs: Long = 0) : RtspState()
 }
 
+/** 指数退避参数 */
+private const val RETRY_DELAY_INITIAL_MS = 1000L
+private const val RETRY_DELAY_MAX_MS = 30_000L
+private const val RETRY_DELAY_MULTIPLIER = 2
+
+/** 延迟统计日志 TAG */
+private const val TAG = "RtspVideoPlayer"
+
 /**
  * RTSP 视频流播放 Composable。
  *
- * 使用 Media3 ExoPlayer + RTSP 扩展拉取 RTSP 流，作为全屏背景层。
+ * 使用 rtspclientlibrary（rtsp-client-android）的 [RtspSurfaceView] 拉取 RTSP 流，
- * [codec] 变化时重建播放器并应用新的解码器策略。
+ * 作为全屏背景层。该库为纯 TCP interleaved + 零缓冲架构（无播放时钟 pacing），
- * 连接失败时显示错误提示。
+ * 帧到达即解码渲染，替代原 Media3 ExoPlayer 播放器缓冲架构以降低延迟。
  *
- * @param url RTSP 流地址，如 `rtsp://10.21.31.103:554/stream`
+ * [codec] 变化时重建连接并应用新的解码器策略。
+ * 连接失败时按指数退避自动重试，URL/codec 变化时重置退避。
+ *
+ * @param url RTSP 流地址，如 `rtsp://10.21.41.1:8554/video1`
  * @param codec 解码器选择策略
  * @param resizeMode 视频缩放模式，默认 ZOOM（等比填充全屏）
  * @param modifier 布局修饰符
@@ -71,172 +87,205 @@ fun RtspVideoPlayer(
     modifier: Modifier = Modifier
 ) {
     val context = LocalContext.current
+    val lifecycleOwner = LocalLifecycleOwner.current
 
-    var state by remember { mutableStateOf<RtspState>(RtspState.Connecting) }
+    var state by remember { mutableStateOf<RtspState>(RtspState.Connecting()) }
+    var retryCount by remember { mutableIntStateOf(0) }
+    var retryDelayMs by remember { mutableStateOf(RETRY_DELAY_INITIAL_MS) }
+    var retrySignal by remember { mutableIntStateOf(0) }
+    // 生命周期主动停止标志：ON_STOP 调用 stop() 触发的断开/失败不应进入重连
+    var stoppedByLifecycle by remember { mutableStateOf(false) }
+    // 最近一次生效的 url/codec：用于区分「参数变化（重置退避立即连接）」与「重试」
+    var lastParams by remember { mutableStateOf<Pair<String, VideoCodec>?>(null) }
 
-    // codec 变化时重建 ExoPlayer，新的 selector 在 RenderersFactory 中注入，
+    // codec 变化时重建 RtspSurfaceView（在 factory 中映射为 DecoderType）。
-    // 同时使用最小缓冲策略降低延迟
+    // RtspSurfaceView 持有 RtspProcessor，内部线程在 dispose 时由 stop() 停止。
-    val player: ExoPlayer = remember(codec) {
+    val rtspView = remember(codec, context) {
-        val selector = codec.toMediaCodecSelector()
+        RtspSurfaceView(context).apply {
-        val renderersFactory = DefaultRenderersFactory(context)
+            videoDecoderType = codec.toDecoderType()
-        renderersFactory.setMediaCodecSelector(selector)
+            // 实验性 SPS 低延迟参数重写（仅 H.264：num_ref_frames -> 0，部分硬件
-        val loadControl = DefaultLoadControl.Builder()
+            // 解码器可降低约 2 倍延迟；H.265 流自动跳过）
-            .setBufferDurationsMs(
+            experimentalUpdateSpsFrameWithLowLatencyParams = true
-                200,   // minBufferMs — 必须 >= bufferForPlaybackAfterRebufferMs
+            setStatusListener(object : RtspStatusListener {
-                500,   // maxBufferMs
+                override fun onRtspStatusConnected() {
-                100,   // bufferForPlaybackMs — 起播所需缓冲
+                    state = RtspState.Playing
-                200    // bufferForPlaybackAfterRebufferMs — 重缓冲后所需缓冲
+                }
+
+                override fun onRtspStatusFailed(message: String?) {
+                    if (stoppedByLifecycle) return
+                    state = RtspState.Error(
+                        message = message ?: "连接失败",
+                        retryCount = retryCount,
+                        nextRetryMs = retryDelayMs
                     )
-            .setBackBuffer(0, false)
+                    // 递增 retrySignal 触发 LaunchedEffect 自动重试
-            .setPrioritizeTimeOverSizeThresholds(true)
+                    retrySignal++
-            .build()
-        ExoPlayer.Builder(context, renderersFactory)
-            .setLoadControl(loadControl)
-            .build()
-            .apply {
-                repeatMode = Player.REPEAT_MODE_OFF
-                playWhenReady = true
-                addListener(object : Player.Listener {
-                    override fun onPlaybackStateChanged(playbackState: Int) {
-                        state = when (playbackState) {
-                            Player.STATE_BUFFERING -> RtspState.Connecting
-                            Player.STATE_READY -> RtspState.Playing
-                            Player.STATE_IDLE -> RtspState.Connecting
-                            else -> state
-                        }
                 }
 
-                    override fun onPlayerError(error: PlaybackException) {
+                override fun onRtspStatusDisconnected() {
-                        state = RtspState.Error(error.message ?: "连接失败")
+                    if (stoppedByLifecycle) return
+                    // 非主动停止时视为连接丢失，进入重试
+                    state = RtspState.Error(
+                        message = "连接断开",
+                        retryCount = retryCount,
+                        nextRetryMs = retryDelayMs
+                    )
+                    retrySignal++
                 }
             })
         }
     }
 
-    // URL 或 codec 变化时重新加载媒体源
+    // 初始连接 + 自动重试：key 包含 url/codec 变化时自动取消旧重试
-    LaunchedEffect(url, codec) {
+    LaunchedEffect(url, codec, retrySignal) {
         if (url.isNotBlank()) {
-            state = RtspState.Connecting
+            val params = url to codec
-            val mediaItem = MediaItem.fromUri(url)
+            if (lastParams != params) {
-            player.setMediaItem(mediaItem)
+                // 首次连接 / URL 或 codec 变更：重置退避并立即连接
-            player.prepare()
+                lastParams = params
+                retryCount = 0
+                retryDelayMs = RETRY_DELAY_INITIAL_MS
+            } else {
+                // 重试：指数退避等待
+                delay(retryDelayMs)
+                retryDelayMs = (retryDelayMs * RETRY_DELAY_MULTIPLIER).coerceAtMost(RETRY_DELAY_MAX_MS)
+                retryCount++
+            }
+            state = RtspState.Connecting(retryCount)
+            rtspView.init(Uri.parse(url))
+            rtspView.start(requestVideo = true, requestAudio = false)
         }
     }
 
-    // codec 变化时释放旧播放器
+    // 延迟统计：轮询库内统计（读取 statistics 会激活测量），输出到 Logcat。
-    DisposableEffect(codec) {
+    // 播放中每 2s 上报一次解码/网络延迟，用于验证低延迟改造效果。
+    LaunchedEffect(rtspView) {
+        while (true) {
+            delay(2000)
+            val s = rtspView.statistics
+            val decLat = s.videoDecoderLatencyMsec
+            val netLat = s.networkLatencyMsec
+            if (decLat >= 0 || netLat >= 0) {
+                Log.i(
+                    TAG,
+                    "decoder=${s.videoDecoderName} (${s.videoDecoderType}), " +
+                        "videoDecoderLatency=${decLat}ms, networkLatency=${netLat}ms"
+                )
+            }
+        }
+    }
+
+    // 界面生命周期：onStop 时停止播放（后台停止拉流/解码），onStart 时恢复
+    DisposableEffect(lifecycleOwner, rtspView) {
+        val observer = LifecycleEventObserver { _, event ->
+            when (event) {
+                Lifecycle.Event.ON_STOP -> {
+                    if (rtspView.isStarted()) {
+                        stoppedByLifecycle = true
+                        rtspView.stop()
+                    }
+                }
+                Lifecycle.Event.ON_START -> {
+                    stoppedByLifecycle = false
+                    // 重新连接；retrySignal 递增触发 LaunchedEffect（重置退避）
+                    retrySignal++
+                }
+                else -> {}
+            }
+        }
+        lifecycleOwner.lifecycle.addObserver(observer)
         onDispose {
-            player.release()
+            lifecycleOwner.lifecycle.removeObserver(observer)
+            stoppedByLifecycle = true
+            rtspView.stop()
         }
     }
 
     Box(modifier = modifier) {
-        // 仅在视频播放中时渲染 PlayerView，否则透出底层背景
+        // 始终渲染 SurfaceView：首帧未到前为透明，SurfaceView 在 Compose 之上的
-        if (state is RtspState.Playing) {
+        // 层级需保持存在，否则解码渲染目标 surface 会被销毁。
         AndroidView(
             modifier = Modifier.fillMaxSize(),
-                factory = { ctx ->
+            factory = { rtspView }
-                    PlayerView(ctx).apply {
-                        useController = false
-                        this.resizeMode = resizeMode.toMedia3ResizeMode()
-                        this.player = player
-                        setShutterBackgroundColor(android.graphics.Color.TRANSPARENT)
-                    }
-                },
-                update = { view ->
-                    view.player = player
-                    view.resizeMode = resizeMode.toMedia3ResizeMode()
-                }
         )
-        }
 
         // 连接中 / 错误时的提示覆盖层
         when (val s = state) {
-            is RtspState.Connecting -> StatusOverlay("连接 RTSP 流中...")
+            is RtspState.Connecting -> {
-            is RtspState.Error -> StatusOverlay("RTSP 连接失败: ${s.message}")
+                val msg = if (s.retryCount > 0) {
+                    "RTSP 重连中... (第 ${s.retryCount} 次)"
+                } else {
+                    "连接 RTSP 流中..."
+                }
+                StatusOverlay(msg)
+            }
+            is RtspState.Error -> {
+                val retryHint = if (s.nextRetryMs > 0) {
+                    "${s.nextRetryMs / 1000}s 后自动重试"
+                } else ""
+                StatusOverlay(
+                    text = "RTSP 连接失败: ${s.message}",
+                    subtitle = retryHint
+                )
+            }
             is RtspState.Playing -> { /* 正常播放，不显示覆盖层 */ }
         }
     }
 }
 
 @Composable
-private fun StatusOverlay(text: String) {
+private fun StatusOverlay(text: String, subtitle: String = "") {
     Box(
         modifier = Modifier.fillMaxSize(),
         contentAlignment = Alignment.Center
     ) {
+        Column(horizontalAlignment = Alignment.CenterHorizontally) {
             Text(
                 text = text,
-            color = Color.White
+                color = Color.White,
+                fontSize = 16.sp
+            )
+            if (subtitle.isNotBlank()) {
+                Text(
+                    text = subtitle,
+                    color = Color.White.copy(alpha = 0.7f),
+                    fontSize = 13.sp,
+                    fontWeight = FontWeight.Light,
+                    modifier = Modifier.padding(top = 4.dp)
                 )
             }
         }
+    }
+}
 
-// ==================== 解码器选择器 ====================
+// ==================== 解码器映射 ====================
-
-/** MIME 类型常量 */
-private const val MIME_H264 = "video/avc"
-private const val MIME_HEVC = "video/hevc"
 
 /**
- * 将 [VideoCodec] 枚举映射为 [MediaCodecSelector]。
+ * 将 [VideoCodec] 枚举映射为 rtspclientlibrary 的 [VideoDecodeThread.DecoderType]。
  *
- * - AUTO: 默认选择器（优先硬件解码）
+ * - AUTO: 硬件解码（库默认，解码失败自动回退软件）
- * - FORCE_HW: 强制硬件解码，所有 MIME 类型仅保留硬件加速解码器
+ * - FORCE_HW: 强制硬件解码
- * - FORCE_SW_H264: 针对 H.264 仅保留软件解码器，其余 MIME 走默认
+ * - FORCE_SW_H264: 强制软件解码（对 H.264 流有效）
- * - FORCE_SW_H265: 针对 H.265/HEVC 仅保留软件解码器，其余 MIME 走默认
+ * - FORCE_SW_H265: 强制软件解码（对 H.265 流有效）
+ *
+ * 注意：库的 DecoderType 仅区分 HARDWARE/SOFTWARE，不支持按 MIME 分别指定，
+ * 因此 FORCE_SW_* 在码流与所选 MIME 不符时仍可能走硬件（与上游行为一致）。
  */
-private fun VideoCodec.toMediaCodecSelector(): MediaCodecSelector = when (this) {
+private fun VideoCodec.toDecoderType(): VideoDecodeThread.DecoderType = when (this) {
-    VideoCodec.AUTO -> MediaCodecSelector.DEFAULT
+    VideoCodec.AUTO,
-
+    VideoCodec.FORCE_HW -> VideoDecodeThread.DecoderType.HARDWARE
-    VideoCodec.FORCE_HW -> forceHardware()
+    VideoCodec.FORCE_SW_H264,
-    VideoCodec.FORCE_SW_H264 -> forceSoftwareForMime(MIME_H264)
+    VideoCodec.FORCE_SW_H265 -> VideoDecodeThread.DecoderType.SOFTWARE
-    VideoCodec.FORCE_SW_H265 -> forceSoftwareForMime(MIME_HEVC)
 }
 
+// ==================== 缩放模式 ====================
+
 /**
- * 创建一个 [MediaCodecSelector]，仅对指定 [mimeType] 强制软件解码。
+ * 缩放模式说明：
- * 其余 MIME 类型使用默认行为。
+ *
+ * rtspclientlibrary 的 [RtspSurfaceView] 不做等比缩放/裁剪，surface 填满其布局
+ * 区域，视频渲染为全幅铺满（与旧 ExoPlayer 的 FILL 行为一致）。本应用视频作为
+ * 全屏背景层，默认 ZOOM 与 FILL 视觉近似，因此当前三种模式统一按全幅铺满处理；
+ * 若需精确 FIT（留黑边）或 ZOOM（按视频宽高比裁剪），需在 [RtspStatusListener]
+ * 的 onRtspFrameSizeChanged 中拿到视频尺寸后覆写视图测量，留待后续按需实现。
  */
-private fun forceSoftwareForMime(targetMime: String): MediaCodecSelector = object : MediaCodecSelector {
-    override fun getDecoderInfos(
-        mimeType: String,
-        requiresSecureDecoder: Boolean,
-        requiresTunnelingDecoder: Boolean
-    ): List<MediaCodecInfo> {
-        val all = MediaCodecSelector.DEFAULT.getDecoderInfos(
-            mimeType, requiresSecureDecoder, requiresTunnelingDecoder
-        )
-        // 只对目标 MIME 类型过滤，其余保持默认
-        return if (mimeType == targetMime) {
-            all.filter { !it.hardwareAccelerated }
-        } else {
-            all
-        }
-    }
-}
-
-/**
- * 创建一个 [MediaCodecSelector]，所有 MIME 类型仅保留硬件加速解码器。
- * 用于强制硬件解码模式（延迟优先）。
- */
-private fun forceHardware(): MediaCodecSelector = object : MediaCodecSelector {
-    override fun getDecoderInfos(
-        mimeType: String,
-        requiresSecureDecoder: Boolean,
-        requiresTunnelingDecoder: Boolean
-    ): List<MediaCodecInfo> {
-        return MediaCodecSelector.DEFAULT.getDecoderInfos(
-            mimeType, requiresSecureDecoder, requiresTunnelingDecoder
-        ).filter { it.hardwareAccelerated }
-    }
-}
-
-// ==================== 缩放模式映射 ====================
-
-/** 将 [VideoResizeMode] 映射为 [AspectRatioFrameLayout] 的 resizeMode 常量。 */
-private fun VideoResizeMode.toMedia3ResizeMode(): Int = when (this) {
-    VideoResizeMode.FIT -> AspectRatioFrameLayout.RESIZE_MODE_FIT
-    VideoResizeMode.ZOOM -> AspectRatioFrameLayout.RESIZE_MODE_ZOOM
-    VideoResizeMode.FILL -> AspectRatioFrameLayout.RESIZE_MODE_FILL
-}

gradle/libs.versions.toml

@@ -12,6 +12,8 @@ datastore = "1.1.3"
 navigationCompose = "2.8.6"
 media3 = "1.5.1"
 kotlinxSerialization = "1.7.3"
+annotation = "1.10.0"
+jcodec = "0.2.5"
 
 [libraries]
 androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
@@ -36,6 +38,8 @@ androidx-media3-ui = { group = "androidx.media3", name = "media3-ui", version.re
 androidx-lifecycle-viewmodel-compose = { group = "androidx.lifecycle", name = "lifecycle-viewmodel-compose", version.ref = "lifecycleRuntimeKtx" }
 androidx-lifecycle-runtime-compose = { group = "androidx.lifecycle", name = "lifecycle-runtime-compose", version.ref = "lifecycleRuntimeKtx" }
 kotlinx-serialization-json = { group = "org.jetbrains.kotlinx", name = "kotlinx-serialization-json", version.ref = "kotlinxSerialization" }
+androidx-annotation = { group = "androidx.annotation", name = "annotation", version.ref = "annotation" }
+jcodec = { group = "org.jcodec", name = "jcodec", version = "0.2.5" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }

rtspclientlibrary/build.gradle.kts

@@ -0,0 +1,35 @@
+// rtspclientlibrary：从 rtsp-client-android 拷贝的本地模块（library-client-rtsp）
+// 源码与上游保持同步，仅改写构建脚本为 Kotlin DSL + 版本目录。
+plugins {
+    alias(libs.plugins.android.library)
+}
+
+android {
+    namespace = "com.alexvas.rtsp"
+    compileSdk = 36
+
+    defaultConfig {
+        minSdk = 24
+        targetSdk = 36
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.txt")
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.annotation)
+    // media3 仅用于 MediaCodecUtil 解码器枚举 / NalUnitUtil SPS 解析（编译期必需）
+    implementation(libs.androidx.media3.exoplayer)
+    // jcodec 用于 SPS 低延迟参数重写
+    implementation(libs.jcodec)
+}

rtspclientlibrary/proguard-rules.txt

@@ -0,0 +1,2 @@
+# Proguard rules.
+

rtspclientlibrary/src/main/AndroidManifest.xml

@@ -0,0 +1,4 @@
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.INTERNET" />
+</manifest>

rtspclientlibrary/src/main/java/com/alexvas/rtsp/codec/AudioDecodeThread.kt

@@ -0,0 +1,231 @@
+package com.alexvas.rtsp.codec
+
+import android.media.*
+import android.os.Process
+import android.util.Log
+import java.nio.ByteBuffer
+
+
+class AudioDecodeThread (
+        private val mimeType: String,
+        private val sampleRate: Int,
+        private val channelCount: Int,
+        private val codecConfig: ByteArray?,
+        private val audioFrameQueue: AudioFrameQueue) : Thread() {
+
+    private var isRunning = true
+
+    fun stopAsync() {
+        if (DEBUG) Log.v(TAG, "stopAsync()")
+        isRunning = false
+        // Wake up sleep() code
+        interrupt()
+    }
+
+    override fun run() {
+        if (DEBUG) Log.d(TAG, "$name started")
+
+        Process.setThreadPriority(Process.THREAD_PRIORITY_AUDIO)
+
+        // Creating audio decoder
+        val decoder = MediaCodec.createDecoderByType(mimeType)
+        val format = MediaFormat.createAudioFormat(mimeType, sampleRate, channelCount)
+
+        if (mimeType == MediaFormat.MIMETYPE_AUDIO_AAC) {
+            val csd0 = codecConfig ?: getAacDecoderConfigData(MediaCodecInfo.CodecProfileLevel.AACObjectLC, sampleRate, channelCount)
+            format.setByteBuffer("csd-0", ByteBuffer.wrap(csd0))
+            format.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC)
+        } else if (mimeType == MediaFormat.MIMETYPE_AUDIO_OPUS) {
+            // TODO: Add Opus support
+
+//            val OPUS_IDENTIFICATION_HEADER = "OpusHead".toByteArray()
+//            val OPUS_PRE_SKIP_NSEC = ByteBuffer.allocate(8).putLong(11971).array()
+//            val OPUS_SEEK_PRE_ROLL_NSEC = ByteBuffer.allocate(8).putLong(80000000).array()
+
+//            val csd0 = ByteBuffer.allocate(8+1+1+2+4+2+1)
+//            csd0.put("OpusHead".toByteArray())
+//            // Version
+//            csd0.put(1)
+//            // Number of channels
+//            csd0.put(2)
+//            // Pre-skip
+//            csd0.putShort(0)
+//            csd0.putInt(sampleRate)
+//            // Output Gain
+//            csd0.putShort(0)
+//            // Channel Mapping Family
+//            csd0.put(0)
+            // Buffer buf = new Buffer();
+//                // Magic Signature：固定头，占8个字节，为字符串OpusHead
+//                buf.write("OpusHead".getBytes(StandardCharsets.UTF_8));
+//                // Version：版本号，占1字节，固定为0x01
+//                buf.writeByte(1);
+//                // Channel Count：通道数，占1字节，根据音频流通道自行设置，如0x02
+//                buf.writeByte(1);
+//                // Pre-skip：回放的时候从解码器中丢弃的samples数量，占2字节，为小端模式，默认设置0x00,
+//                buf.writeShortLe(0);
+//                // Input Sample Rate (Hz)：音频流的Sample Rate，占4字节，为小端模式，根据实际情况自行设置
+//                buf.writeIntLe(currentFormat.HZ);
+//                //Output Gain：输出增益，占2字节，为小端模式，没有用到默认设置0x00, 0x00就好
+//                buf.writeShortLe(0);
+//                // Channel Mapping Family：通道映射系列，占1字节，默认设置0x00就好
+//                buf.writeByte(0);
+//                //Channel Mapping Table：可选参数，上面的Family默认设置0x00的时候可忽略
+//            format.setByteBuffer("csd-0", ByteBuffer.wrap(OPUS_IDENTIFICATION_HEADER).order(ByteOrder.BIG_ENDIAN))
+//            format.setByteBuffer("csd-1", ByteBuffer.wrap(OPUS_PRE_SKIP_NSEC).order(ByteOrder.BIG_ENDIAN))
+//            format.setByteBuffer("csd-2", ByteBuffer.wrap(OPUS_SEEK_PRE_ROLL_NSEC).order(ByteOrder.LITTLE_ENDIAN))
+
+            val csd0 = byteArrayOf(
+                0x4f, 0x70, 0x75, 0x73, // "Opus"
+                0x48, 0x65, 0x61, 0x64, // "Head"
+                0x01,  // Version
+                0x02,  // Channel Count
+                0x00, 0x00,  // Pre skip
+                0x80.toByte(), 0xbb.toByte(), 0x00, 0x00, // Sample rate 48000
+                0x00, 0x00,  // Output Gain (Q7.8 in dB)
+                0x00,  // Mapping Family
+            )
+            val csd1 = byteArrayOf(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)
+            val csd2 = byteArrayOf(0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00)
+            format.setByteBuffer("csd-0", ByteBuffer.wrap(csd0))
+            format.setByteBuffer("csd-1", ByteBuffer.wrap(csd1))
+            format.setByteBuffer("csd-2", ByteBuffer.wrap(csd2))
+        }
+
+        decoder.configure(format, null, null, 0)
+        decoder.start()
+
+        // Creating audio playback device
+        val outChannel = if (channelCount > 1) AudioFormat.CHANNEL_OUT_STEREO else AudioFormat.CHANNEL_OUT_MONO
+        val outAudio = AudioFormat.ENCODING_PCM_16BIT
+        val bufferSize = AudioTrack.getMinBufferSize(sampleRate, outChannel, outAudio)
+//      Log.i(TAG, "sampleRate: $sampleRate, bufferSize: $bufferSize".format(sampleRate, bufferSize))
+        val audioTrack = AudioTrack(
+                AudioAttributes.Builder()
+                        .setUsage(AudioAttributes.USAGE_MEDIA)
+                        .setContentType(AudioAttributes.CONTENT_TYPE_SPEECH)
+                        .build(),
+                AudioFormat.Builder()
+                        .setEncoding(outAudio)
+                        .setChannelMask(outChannel)
+                        .setSampleRate(sampleRate)
+                        .build(),
+                bufferSize,
+                AudioTrack.MODE_STREAM,
+                0)
+        audioTrack.play()
+
+        val bufferInfo = MediaCodec.BufferInfo()
+        while (isRunning) {
+            val inIndex: Int = decoder.dequeueInputBuffer(10000L)
+            if (inIndex >= 0) {
+                // fill inputBuffers[inputBufferIndex] with valid data
+                var byteBuffer: ByteBuffer?
+                try {
+                    byteBuffer = decoder.getInputBuffer(inIndex)
+                } catch (e: Exception) {
+                    e.printStackTrace()
+                    break
+                }
+                byteBuffer?.rewind()
+
+                // Preventing BufferOverflowException
+//              if (length > byteBuffer.limit()) throw DecoderFatalException("Error")
+
+                val audioFrame: FrameQueue.Frame?
+                try {
+                    audioFrame = audioFrameQueue.pop()
+                    if (audioFrame == null) {
+                        Log.d(TAG, "Empty audio frame")
+                        // Release input buffer
+                        decoder.queueInputBuffer(inIndex, 0, 0, 0L, 0)
+                    } else {
+                        byteBuffer?.put(audioFrame.data, audioFrame.offset, audioFrame.length)
+                        decoder.queueInputBuffer(inIndex, audioFrame.offset, audioFrame.length, audioFrame.timestampMs, 0)
+                    }
+                } catch (e: Exception) {
+                    e.printStackTrace()
+                }
+            }
+//            Log.i(TAG, "inIndex: ${inIndex}")
+
+            try {
+//                Log.w(TAG, "outIndex: ${outIndex}")
+                if (!isRunning) break
+                when (val outIndex = decoder.dequeueOutputBuffer(bufferInfo, 10000L)) {
+                    MediaCodec.INFO_OUTPUT_FORMAT_CHANGED -> Log.d(TAG, "Decoder format changed: ${decoder.outputFormat}")
+                    MediaCodec.INFO_TRY_AGAIN_LATER -> if (DEBUG) Log.d(TAG, "No output from decoder available")
+                    else -> {
+                        if (outIndex >= 0) {
+                            val byteBuffer: ByteBuffer? = decoder.getOutputBuffer(outIndex)
+
+                            val chunk = ByteArray(bufferInfo.size)
+                            byteBuffer?.get(chunk)
+                            byteBuffer?.clear()
+
+                            if (chunk.isNotEmpty()) {
+                                audioTrack.write(chunk, 0, chunk.size)
+                            }
+                            decoder.releaseOutputBuffer(outIndex, false)
+                        }
+                    }
+                }
+            } catch (e: Exception) {
+                e.printStackTrace()
+            }
+
+            // All decoded frames have been rendered, we can stop playing now
+            if (bufferInfo.flags and MediaCodec.BUFFER_FLAG_END_OF_STREAM != 0) {
+                Log.d(TAG, "OutputBuffer BUFFER_FLAG_END_OF_STREAM")
+                break
+            }
+        }
+        audioTrack.flush()
+        audioTrack.release()
+
+        try {
+            decoder.stop()
+            decoder.release()
+        } catch (_: InterruptedException) {
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        audioFrameQueue.clear()
+        if (DEBUG) Log.d(TAG, "$name stopped")
+    }
+
+    companion object {
+        private val TAG: String = AudioDecodeThread::class.java.simpleName
+        private const val DEBUG = false
+
+        fun getAacDecoderConfigData(audioProfile: Int, sampleRate: Int, channels: Int): ByteArray {
+            // AOT_LC = 2
+            // 0001 0000 0000 0000
+            var extraDataAac = audioProfile shl 11
+            // Sample rate
+            when (sampleRate) {
+                7350 -> extraDataAac = extraDataAac or (0xC shl 7)
+                8000 -> extraDataAac = extraDataAac or (0xB shl 7)
+                11025 -> extraDataAac = extraDataAac or (0xA shl 7)
+                12000 -> extraDataAac = extraDataAac or (0x9 shl 7)
+                16000 -> extraDataAac = extraDataAac or (0x8 shl 7)
+                22050 -> extraDataAac = extraDataAac or (0x7 shl 7)
+                24000 -> extraDataAac = extraDataAac or (0x6 shl 7)
+                32000 -> extraDataAac = extraDataAac or (0x5 shl 7)
+                44100 -> extraDataAac = extraDataAac or (0x4 shl 7)
+                48000 -> extraDataAac = extraDataAac or (0x3 shl 7)
+                64000 -> extraDataAac = extraDataAac or (0x2 shl 7)
+                88200 -> extraDataAac = extraDataAac or (0x1 shl 7)
+                96000 -> extraDataAac = extraDataAac or (0x0 shl 7)
+            }
+            // Channels
+            extraDataAac = extraDataAac or (channels shl 3)
+            val extraData = ByteArray(2)
+            extraData[0] = (extraDataAac and 0xff00 shr 8).toByte() // high byte
+            extraData[1] = (extraDataAac and 0xff).toByte()         // low byte
+            return extraData
+        }
+    }
+
+}
+

rtspclientlibrary/src/main/java/com/alexvas/rtsp/codec/FrameQueue.kt

@@ -0,0 +1,95 @@
+package com.alexvas.rtsp.codec
+
+import java.util.concurrent.ArrayBlockingQueue
+import java.util.concurrent.TimeUnit
+
+enum class VideoCodecType {
+    H264, H265, UNKNOWN
+}
+
+enum class AudioCodecType {
+    AAC_LC, G711_ALAW, G711_MLAW, UNKNOWN
+}
+
+class VideoFrameQueue(frameQueueCapacity: Int): FrameQueue<FrameQueue.VideoFrame>(frameQueueCapacity)
+class AudioFrameQueue(frameQueueCapacity: Int): FrameQueue<FrameQueue.AudioFrame>(frameQueueCapacity)
+
+/**
+ * Queue for concurrent adding/removing audio/video frames.
+ */
+open class FrameQueue<T>(private val frameQueueCapacity: Int) {
+
+    interface Frame {
+        val data: ByteArray
+        val offset: Int
+        val length: Int
+        val timestampMs: Long  // presentation time in msec
+    }
+
+    data class VideoFrame(
+        /** Only H264 codec supported */
+        val codecType: VideoCodecType,
+        /** Indicates whether it is a keyframe or not */
+        val isKeyframe: Boolean,
+        override val data: ByteArray,
+        override val offset: Int,
+        override val length: Int,
+        /** Video frame timestamp (msec) generated by camera */
+        override val timestampMs: Long,
+        /** Captured (received) video frame timestamp (msec). If -1, not supported. */
+        val capturedTimestampMs: Long = -1
+    ) : Frame
+
+    data class AudioFrame(
+        val codecType: AudioCodecType,
+//      val sampleRate: Int,
+        override val data: ByteArray,
+        override val offset: Int,
+        override val length: Int,
+        override val timestampMs: Long,
+    ) : Frame
+
+    private val queue = ArrayBlockingQueue<T>(frameQueueCapacity)
+
+    val size: Int
+        get() = queue.size
+
+    val capacity: Int
+        get() = frameQueueCapacity
+
+    @Throws(InterruptedException::class)
+    fun push(frame: T): Boolean {
+        if (queue.offer(frame, 5, TimeUnit.MILLISECONDS)) {
+            return true
+        }
+//        Log.w(TAG, "Cannot add frame, queue is full")
+        return false
+    }
+
+    @Throws(InterruptedException::class)
+    open fun pop(timeout: Long = 1000): T? {
+        try {
+            val frame: T? = queue.poll(timeout, TimeUnit.MILLISECONDS)
+//            if (frame == null) {
+//                Log.w(TAG, "Cannot get frame within 1 sec, queue is empty")
+//            }
+            return frame
+        } catch (e: InterruptedException) {
+            Thread.currentThread().interrupt()
+        }
+        return null
+    }
+
+    fun clear() {
+        queue.clear()
+    }
+
+    fun copyInto(dstFrameQueue: FrameQueue<T>) {
+        dstFrameQueue.queue.addAll(queue)
+    }
+
+    companion object {
+        private val TAG: String = FrameQueue::class.java.simpleName
+    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/codec/VideoDecodeThread.kt

@@ -0,0 +1,530 @@
+package com.alexvas.rtsp.codec
+
+import android.annotation.SuppressLint
+import android.media.MediaCodec
+import android.media.MediaCodec.OnFrameRenderedListener
+import android.media.MediaFormat
+import android.os.Build
+import android.os.Handler
+import android.os.Looper
+import android.os.Process
+import android.util.Log
+import com.alexvas.utils.MediaCodecUtils
+import com.alexvas.utils.capabilitiesToString
+import androidx.media3.common.util.Util
+import com.alexvas.utils.VideoCodecUtils
+import com.limelight.binding.video.MediaCodecHelper
+import java.lang.Integer.min
+import java.nio.ByteBuffer
+import java.util.concurrent.TimeUnit
+import java.util.concurrent.atomic.AtomicBoolean
+
+abstract class VideoDecodeThread (
+    protected val mimeType: String,
+    protected val width: Int,
+    protected val height: Int,
+    protected val rotation: Int, // 0, 90, 180, 270
+    protected val videoFrameQueue: VideoFrameQueue,
+    protected val videoDecoderListener: VideoDecoderListener,
+    protected var videoDecoderType: DecoderType
+) : Thread() {
+
+    enum class DecoderType {
+        HARDWARE,
+        SOFTWARE // fallback
+    }
+
+    interface VideoDecoderListener {
+        /** Video decoder successfully started */
+        fun onVideoDecoderStarted() {}
+        /** Video decoder successfully stopped */
+        fun onVideoDecoderStopped() {}
+        /** Fatal error occurred */
+        fun onVideoDecoderFailed(message: String?) {}
+        /** Resolution changed */
+        fun onVideoDecoderFormatChanged(width: Int, height: Int) {}
+        /** First video frame rendered */
+        fun onVideoDecoderFirstFrameRendered() {}
+    }
+
+    protected val uiHandler = Handler(Looper.getMainLooper())
+    protected var exitFlag = AtomicBoolean(false)
+    protected var firstFrameRendered = false
+
+    /** Decoder latency used for statistics */
+    @Volatile private var decoderLatency = -1
+    /** Flag for allowing calculating latency */
+    private var decoderLatencyRequested = false
+    /** Network latency used for statistics */
+    @Volatile private var networkLatency = -1
+    private var videoDecoderName: String? = null
+    private var firstFrameDecoded = false
+    @Volatile private var videoFrameRateStabilization = false
+
+    fun stopAsync() {
+        if (DEBUG) Log.v(TAG, "stopAsync()")
+        exitFlag.set(true)
+        // Wake up sleep() code
+        interrupt()
+    }
+
+    /**
+     * Currently used video decoder. Video decoder can be changed on runtime.
+     * If videoDecoderType set to HARDWARE, it can be switched to SOFTWARE in case of decoding issue
+     * (e.g. hardware decoder does not support the stream resolution).
+     * If videoDecoderType set to SOFTWARE, it will always remain SOFTWARE (no any changes).
+     */
+    fun getCurrentVideoDecoderType(): DecoderType {
+        return videoDecoderType
+    }
+
+    fun getCurrentVideoDecoderName(): String? {
+        return videoDecoderName
+    }
+
+    /**
+     * Get frames decoding/rendering latency in msec. Returns -1 if not supported.
+     */
+    fun getCurrentVideoDecoderLatencyMsec(): Int {
+        decoderLatencyRequested = true
+        return decoderLatency
+    }
+
+    /**
+     * Get network latency in msec. Returns -1 if not supported.
+     */
+    fun getCurrentNetworkLatencyMsec(): Int {
+        return networkLatency
+    }
+
+    fun setVideoFrameRateStabilization(enable: Boolean) {
+        if (DEBUG) Log.v(TAG, "setVideoFrameRateStabilization(enable=$enable)")
+        videoFrameRateStabilization = enable
+    }
+
+    fun hasVideoFrameRateStabilization(): Boolean {
+        return videoFrameRateStabilization
+    }
+
+    @SuppressLint("UnsafeOptInUsageError")
+    private fun getDecoderSafeWidthHeight(decoder: MediaCodec): Pair<Int, Int> {
+        if (DEBUG) Log.v(TAG, "getDecoderSafeWidthHeight()")
+        val capabilities = decoder.codecInfo.getCapabilitiesForType(mimeType).videoCapabilities
+        return if (capabilities == null) {
+            Log.e(TAG, "Not a video decoder")
+            Pair(-1, -1)
+        } else if (capabilities.isSizeSupported(width, height)) {
+            Log.i(TAG, "Video decoder frame size ${width}x${height} supported")
+            Pair(width, height)
+        } else {
+            Log.w(TAG, "Video decoder frame size ${width}x${height} is not supported")
+            val widthAlignment = capabilities.widthAlignment
+            val heightAlignment = capabilities.heightAlignment
+            val w = Util.ceilDivide(width, widthAlignment) * widthAlignment
+            val h = Util.ceilDivide(height, heightAlignment) * heightAlignment
+            if (capabilities.isSizeSupported(w, h)) {
+                Log.i(TAG, "Video decoder frame size ${w}x${h} calculated from alignment ${widthAlignment}x${heightAlignment} and original size ${width}x${height}]")
+                Pair(w, h)
+            } else {
+                val p = Pair(capabilities.supportedWidths.upper, capabilities.supportedHeights.upper)
+                Log.i(TAG, "Video decoder max supported frame size ${w}x${h}")
+                p
+            }
+        }
+    }
+
+    @SuppressLint("InlinedApi")
+    private fun getWidthHeight(mediaFormat: MediaFormat): Pair<Int, Int> {
+        // Sometimes height obtained via KEY_HEIGHT is not valid, e.g. can be 1088 instead 1080
+        // (no problems with width though). Use crop parameters to correctly determine height.
+        val hasCrop =
+            mediaFormat.containsKey(MediaFormat.KEY_CROP_RIGHT) && mediaFormat.containsKey(MediaFormat.KEY_CROP_LEFT) &&
+            mediaFormat.containsKey(MediaFormat.KEY_CROP_BOTTOM) && mediaFormat.containsKey(MediaFormat.KEY_CROP_TOP)
+        val width =
+            if (hasCrop)
+                mediaFormat.getInteger(MediaFormat.KEY_CROP_RIGHT) - mediaFormat.getInteger(MediaFormat.KEY_CROP_LEFT) + 1
+            else
+                mediaFormat.getInteger(MediaFormat.KEY_WIDTH)
+        var height =
+            if (hasCrop)
+                mediaFormat.getInteger(MediaFormat.KEY_CROP_BOTTOM) - mediaFormat.getInteger(MediaFormat.KEY_CROP_TOP) + 1
+            else
+                mediaFormat.getInteger(MediaFormat.KEY_HEIGHT)
+        // Fix for 1080p resolution for Samsung S21
+        // {crop-right=1919, max-height=4320, sar-width=1, color-format=2130708361, mime=video/raw,
+        // hdr-static-info=java.nio.HeapByteBuffer[pos=0 lim=25 cap=25],
+        // priority=0, color-standard=1, feature-secure-playback=0, color-transfer=3, sar-height=1,
+        // crop-bottom=1087, max-width=8192, crop-left=0, width=1920, color-range=2, crop-top=0,
+        // rotation-degrees=0, frame-rate=30, height=1088}
+        height = height / 16 * 16 // 1088 -> 1080
+//        if (height == 1088)
+//            height = 1080
+        return Pair(width, height)
+    }
+
+    private fun getDecoderMediaFormat(decoder: MediaCodec): MediaFormat {
+        if (DEBUG) Log.v(TAG, "getDecoderMediaFormat()")
+        val safeWidthHeight = getDecoderSafeWidthHeight(decoder)
+        val format = MediaFormat.createVideoFormat(mimeType, safeWidthHeight.first, safeWidthHeight.second)
+        if (DEBUG)
+            Log.d(TAG, "Configuring surface ${safeWidthHeight.first}x${safeWidthHeight.second} w/ '$mimeType'")
+        else
+            Log.i(TAG, "Configuring surface ${safeWidthHeight.first}x${safeWidthHeight.second} w/ '$mimeType'")
+        format.setInteger(MediaFormat.KEY_ROTATION, rotation)
+//        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+//            // format.setFeatureEnabled(android.media.MediaCodecInfo.CodecCapabilities.FEATURE_LowLatency, true)
+//            // Request low-latency for the decoder. Not all of the decoders support that.
+//            format.setInteger(MediaFormat.KEY_LOW_LATENCY, 1)
+//        }
+
+        val succeeded = MediaCodecHelper.setDecoderLowLatencyOptions(format, decoder.codecInfo, 1)
+        Log.i(TAG, "Low-latency: $succeeded")
+
+        return format
+    }
+
+    /** Decoder created */
+    abstract fun decoderCreated(mediaCodec: MediaCodec, mediaFormat: MediaFormat)
+
+    /** Frame processed */
+    abstract fun releaseOutputBuffer(
+        mediaCodec: MediaCodec,
+        outIndex: Int,
+        bufferInfo: MediaCodec.BufferInfo,
+        render: Boolean
+    )
+
+    /** Decoder stopped and released */
+    abstract fun decoderDestroyed(mediaCodec: MediaCodec)
+
+    private fun createVideoDecoderAndStart(decoderType: DecoderType): MediaCodec {
+        if (DEBUG) Log.v(TAG, "createVideoDecoderAndStart(decoderType=$decoderType)")
+
+        @SuppressLint("UnsafeOptInUsageError")
+        val decoder = when (decoderType) {
+            DecoderType.HARDWARE -> {
+                val hwDecoders = MediaCodecUtils.getHardwareDecoders(mimeType)
+                if (hwDecoders.isEmpty()) {
+                    Log.w(TAG, "Cannot get hardware video decoders for mime type '$mimeType'. Using default one.")
+                    MediaCodec.createDecoderByType(mimeType)
+                } else {
+                    val lowLatencyDecoder = MediaCodecUtils.getLowLatencyDecoder(hwDecoders)
+                    val name = lowLatencyDecoder?.let {
+                        Log.i(TAG, "[$name] Dedicated low-latency decoder found '${lowLatencyDecoder.name}'")
+                        lowLatencyDecoder.name
+                    } ?: hwDecoders[0].name
+                    MediaCodec.createByCodecName(name)
+                }
+            }
+            DecoderType.SOFTWARE -> {
+                val swDecoders = MediaCodecUtils.getSoftwareDecoders(mimeType)
+                if (swDecoders.isEmpty()) {
+                    Log.w(TAG, "Cannot get software video decoders for mime type '$mimeType'. Using default one .")
+                    MediaCodec.createDecoderByType(mimeType)
+                } else {
+                    val name = swDecoders[0].name
+                    MediaCodec.createByCodecName(name)
+                }
+            }
+        }
+        this.videoDecoderType = decoderType
+        this.videoDecoderName = decoder.name
+
+        val frameRenderedListener = OnFrameRenderedListener { _, _, _ ->
+            if (!firstFrameRendered) {
+                firstFrameRendered = true
+                uiHandler.post {
+                    videoDecoderListener.onVideoDecoderFirstFrameRendered()
+                }
+            }
+        }
+        decoder.setOnFrameRenderedListener(frameRenderedListener, null)
+        val format = getDecoderMediaFormat(decoder)
+        decoderCreated(decoder, format)
+        decoder.start()
+
+        val capabilities = decoder.codecInfo.getCapabilitiesForType(mimeType)
+        val lowLatencySupport = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            capabilities.isFeatureSupported(android.media.MediaCodecInfo.CodecCapabilities.FEATURE_LowLatency)
+        } else {
+            false
+        }
+        Log.i(TAG, "[$name] Video decoder '${decoder.name}' started " +
+                "(${if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { if (decoder.codecInfo.isHardwareAccelerated) "hardware" else "software" } else ""}, " +
+                "${capabilities.capabilitiesToString()}, " +
+                "${if (lowLatencySupport) "w/" else "w/o"} low-latency support)")
+
+        return decoder
+    }
+
+    private fun stopAndReleaseVideoDecoder(decoder: MediaCodec) {
+        if (DEBUG) Log.v(TAG, "stopAndReleaseVideoDecoder()")
+        val type = videoDecoderType.toString().lowercase()
+        Log.i(TAG, "Stopping $type video decoder...")
+        try {
+            decoder.stop()
+            Log.i(TAG, "Decoder successfully stopped")
+        } catch (e3: Throwable) {
+            Log.e(TAG, "Failed to stop decoder", e3)
+        }
+        Log.i(TAG, "Releasing decoder...")
+        try {
+            decoder.release()
+            Log.i(TAG, "Decoder successfully released")
+        } catch (e3: Throwable) {
+            Log.e(TAG, "Failed to release decoder", e3)
+        }
+        videoFrameQueue.clear()
+        decoderDestroyed(decoder)
+    }
+
+    override fun run() {
+        if (DEBUG) Log.d(TAG, "$name started")
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+            Process.setThreadPriority(Process.THREAD_PRIORITY_VIDEO)
+        }
+
+        videoDecoderListener.onVideoDecoderStarted()
+
+        try {
+            Log.i(TAG, "Starting hardware video decoder...")
+            var decoder = try {
+                createVideoDecoderAndStart(videoDecoderType)
+            } catch (e: Throwable) {
+                Log.e(TAG, "Failed to start $videoDecoderType video decoder (${e.message})", e)
+                Log.i(TAG, "Starting software video decoder...")
+                try {
+                    createVideoDecoderAndStart(DecoderType.SOFTWARE)
+                } catch (e2: Throwable) {
+                    Log.e(TAG, "Failed to start video software decoder. Exiting...", e2)
+                    // Unexpected behavior
+                    videoDecoderListener.onVideoDecoderFailed("Cannot initialize video decoder for mime type '$mimeType'")
+                    return
+                }
+            }
+            val bufferInfo = MediaCodec.BufferInfo()
+
+            try {
+                var widthHeightFromStream: Pair<Int, Int>? = null
+
+                // Map for calculating decoder rendering latency.
+                // key - original frame timestamp, value - timestamp when frame was added to the map
+                val keyframesTimestamps = HashMap<Long, Long>()
+
+                var frameQueuedMsec = System.currentTimeMillis()
+                var frameAlreadyDequeued = false
+
+                // Main loop
+                while (!exitFlag.get()) {
+                    try {
+                        val inIndex: Int = decoder.dequeueInputBuffer(DEQUEUE_INPUT_TIMEOUT_US)
+                        if (inIndex >= 0) {
+                            // fill inputBuffers[inputBufferIndex] with valid data
+                            val byteBuffer: ByteBuffer? = decoder.getInputBuffer(inIndex)
+                            byteBuffer?.rewind()
+
+                            // Preventing BufferOverflowException
+                            // if (length > byteBuffer.limit()) throw DecoderFatalException("Error")
+
+                            val frame = videoFrameQueue.pop()
+                            if (frame == null) {
+                                Log.d(TAG, "Empty video frame")
+                                // Release input buffer
+                                decoder.queueInputBuffer(inIndex, 0, 0, 0L, 0)
+                            } else {
+                                // Add timestamp for keyframe to calculating latency further.
+                                if ((DEBUG || decoderLatencyRequested) && frame.isKeyframe) {
+                                    if (keyframesTimestamps.size > 5) {
+                                        // Something wrong with map. Allow only 5 map entries.
+                                        keyframesTimestamps.clear()
+                                    }
+                                    val l = System.currentTimeMillis()
+                                    keyframesTimestamps[frame.timestampMs] = l
+//                                  Log.d(TAG, "Added $l")
+                                }
+                                // Calculate network latency
+                                networkLatency = if (frame.capturedTimestampMs > -1)
+                                    (frame.timestampMs - frame.capturedTimestampMs).toInt()
+                                else
+                                    -1
+
+                                byteBuffer?.put(frame.data, frame.offset, frame.length)
+                                if (DEBUG) {
+                                    val l = System.currentTimeMillis()
+                                    Log.i(TAG, "\tFrame queued (${l - frameQueuedMsec}) ${if (frame.isKeyframe) "key frame" else ""}")
+                                    frameQueuedMsec = l
+                                }
+                                val flags = if (frame.isKeyframe)
+                                    (MediaCodec.BUFFER_FLAG_KEY_FRAME /*or MediaCodec.BUFFER_FLAG_CODEC_CONFIG*/) else 0
+                                decoder.queueInputBuffer(inIndex, frame.offset, frame.length, frame.timestampMs, flags)
+
+                                if (frame.isKeyframe) {
+                                    // Obtain width and height from stream
+                                    widthHeightFromStream = try {
+                                        VideoCodecUtils.getWidthHeightFromArray(
+                                            frame.data,
+                                            frame.offset,
+                                            // Check only first 100 bytes maximum. That's enough for finding SPS NAL unit.
+                                            min(frame.length, VideoCodecUtils.MAX_NAL_SPS_SIZE),
+                                            isH265 = frame.codecType == VideoCodecType.H265
+                                        )
+                                    } catch (_: Exception) {
+//                                      Log.e(TAG, "Failed to parse width/height from SPS frame. SPS frame seems to be corrupted.", e)
+                                        null
+                                    }
+//                                  Log.i(TAG, "width/height: ${widthHeightFromStream?.first}x${widthHeightFromStream?.second}")
+                                }
+                            }
+                        }
+
+                        if (exitFlag.get()) break
+
+                        // Get all output buffer frames until no buffer from decoder available (INFO_TRY_AGAIN_LATER).
+                        // Single input buffer frame can contain several frames, e.g. SPS + PPS + IDR.
+                        // Thus dequeueOutputBuffer should be called several times.
+                        // First time it obtains SPS + PPS, second one - IDR frame.
+                        do {
+                            // For the first time wait for a frame within 100 msec, next times no timeout
+                            val timeout = if (frameAlreadyDequeued || !firstFrameDecoded) 0L else DEQUEUE_OUTPUT_BUFFER_TIMEOUT_US
+                            val outIndex = decoder.dequeueOutputBuffer(bufferInfo, timeout)
+                            when (outIndex) {
+                                // Resolution changed
+                                MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED, MediaCodec.INFO_OUTPUT_FORMAT_CHANGED -> {
+                                    Log.d(TAG, "Decoder format changed: ${decoder.outputFormat}")
+                                    // Decoder can contain different resolution (it can make downsampling).
+                                    // If resolution successfully obtained from SPS frame, use it.
+                                    val widthHeightFromDecoder = getWidthHeight(decoder.outputFormat)
+                                    val widthHeight = widthHeightFromStream ?: widthHeightFromDecoder
+                                    Log.i(TAG, "Video decoder resolution: ${widthHeightFromDecoder.first}x${widthHeightFromDecoder.second}, stream resolution: ${widthHeightFromStream?.first}x${widthHeightFromStream?.second}")
+
+//                                    val widthHeightFromDecoder = getWidthHeight(decoder.outputFormat)
+                                    val rotation = if (decoder.outputFormat.containsKey(MediaFormat.KEY_ROTATION)) {
+                                        decoder.outputFormat.getInteger(MediaFormat.KEY_ROTATION)
+                                    } else {
+                                        // Some devices like Samsung SM-A505U (Android 11) do not allow
+                                        // video stream rotation on decoding for hardware decoder
+                                        Log.w(TAG, "Video stream rotation is not supported by this Android device (${Build.MODEL} - ${Build.DEVICE}, codec: '${decoder.name}')")
+                                        0
+                                    }
+                                    uiHandler.post {
+                                        // Run in UI thread
+                                        when (rotation) {
+                                            90, 270 -> videoDecoderListener.onVideoDecoderFormatChanged(widthHeight.second, widthHeight.first)
+                                            else -> videoDecoderListener.onVideoDecoderFormatChanged(widthHeight.first, widthHeight.second)
+                                        }
+                                    }
+                                    frameAlreadyDequeued = true
+                                }
+                                // No any frames in queue
+                                MediaCodec.INFO_TRY_AGAIN_LATER -> {
+                                    if (DEBUG) Log.d(TAG, "No output from decoder available")
+                                    frameAlreadyDequeued = true
+                                }
+                                // Frame decoded
+                                else -> {
+                                    if (outIndex >= 0) {
+                                        if (DEBUG || decoderLatencyRequested) {
+                                            val ts = bufferInfo.presentationTimeUs
+                                            keyframesTimestamps.remove(ts)?.apply {
+                                                decoderLatency = (System.currentTimeMillis() - this).toInt()
+//                                              Log.d(TAG, "Removed $this")
+                                            }
+                                        }
+
+                                        val render = bufferInfo.size != 0 && !exitFlag.get()
+                                        if (DEBUG) Log.i(TAG, "\tFrame decoded [outIndex=$outIndex, render=$render]")
+                                        releaseOutputBuffer(decoder, outIndex, bufferInfo, render)
+                                        if (!firstFrameDecoded && render) {
+                                            firstFrameDecoded = true
+                                        }
+                                        frameAlreadyDequeued = false
+                                    } else {
+                                        Log.e(TAG, "Obtaining frame failed w/ error code $outIndex")
+                                    }
+                                }
+                            }
+                        // For SPS/PPS frame request another frame (IDR)
+                        } while (outIndex == MediaCodec.INFO_OUTPUT_BUFFERS_CHANGED || outIndex == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED)
+//                      } while (outIndex != MediaCodec.INFO_TRY_AGAIN_LATER)
+
+                        // All decoded frames have been rendered, we can stop playing now
+                        if (bufferInfo.flags and MediaCodec.BUFFER_FLAG_END_OF_STREAM != 0) {
+                            if (DEBUG) Log.d(TAG, "OutputBuffer BUFFER_FLAG_END_OF_STREAM")
+                            break
+                        }
+                    } catch (_: InterruptedException) {
+                    } catch (e: IllegalStateException) {
+                        // Restarting decoder in software mode
+                        Log.e(TAG, "${e.message}", e)
+                        stopAndReleaseVideoDecoder(decoder)
+                        Log.i(TAG, "Starting software video decoder...")
+                        decoder = createVideoDecoderAndStart(DecoderType.SOFTWARE)
+                        Log.i(TAG, "Software video decoder '${decoder.name}' started (${decoder.codecInfo.getCapabilitiesForType(mimeType).capabilitiesToString()})")
+                    } catch (e: MediaCodec.CodecException) {
+                        Log.w(TAG, "${e.diagnosticInfo}\nisRecoverable: ${e.isRecoverable}, isTransient: ${e.isTransient}")
+                        if (e.isRecoverable) {
+                            // Recoverable error.
+                            // Calling stop(), configure(), and start() to recover.
+                            Log.i(TAG, "Recovering video decoder...")
+                            try {
+                                decoder.stop()
+                                val format = getDecoderMediaFormat(decoder)
+                                decoderCreated(decoder, format)
+                                decoder.start()
+                                Log.i(TAG, "Video decoder recovering succeeded")
+                            } catch (e2: Throwable) {
+                                Log.e(TAG, "Video decoder recovering failed")
+                                Log.e(TAG, "${e2.message}", e2)
+                            }
+                        } else if (e.isTransient) {
+                            // Transient error. Resources are temporarily unavailable and
+                            // the method may be retried at a later time.
+                            Log.w(TAG, "Video decoder resource temporarily unavailable")
+                        } else {
+                            // Fatal error. Restarting decoder in software mode.
+                            stopAndReleaseVideoDecoder(decoder)
+                            Log.i(TAG, "Starting video software decoder...")
+                            decoder = createVideoDecoderAndStart(DecoderType.SOFTWARE)
+                            Log.i(TAG, "Software video decoder '${decoder.name}' started (${decoder.codecInfo.getCapabilitiesForType(mimeType).capabilitiesToString()})")
+                        }
+                    } catch (e: Throwable) {
+                        Log.e(TAG, "${e.message}", e)
+                    }
+                } // while
+
+                // Drain decoder
+                val inIndex: Int = decoder.dequeueInputBuffer(DEQUEUE_INPUT_TIMEOUT_US)
+                if (inIndex >= 0) {
+                    decoder.queueInputBuffer(inIndex, 0, 0, 0L, MediaCodec.BUFFER_FLAG_END_OF_STREAM)
+                } else {
+                    Log.w(TAG, "Not able to signal end of stream")
+                }
+
+            } catch (e2: Throwable) {
+                Log.e(TAG, "${e2.message}", e2)
+            } finally {
+                stopAndReleaseVideoDecoder(decoder)
+            }
+
+        } catch (e: Throwable) {
+            Log.e(TAG, "$name stopped due to '${e.message}'")
+            videoDecoderListener.onVideoDecoderFailed(e.message)
+            // While configuring stopAsync can be called and surface released. Just exit.
+            if (!exitFlag.get()) e.printStackTrace()
+            return
+        }
+
+        videoDecoderListener.onVideoDecoderStopped()
+        if (DEBUG) Log.d(TAG, "$name stopped")
+    }
+
+    companion object {
+        internal val TAG: String = VideoDecodeThread::class.java.simpleName
+        internal const val DEBUG = false
+
+        private val DEQUEUE_INPUT_TIMEOUT_US = TimeUnit.MILLISECONDS.toMicros(500)
+        private val DEQUEUE_OUTPUT_BUFFER_TIMEOUT_US = TimeUnit.MILLISECONDS.toMicros(100)
+    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/codec/VideoDecoderSurfaceThread.kt

@@ -0,0 +1,164 @@
+package com.alexvas.rtsp.codec
+
+import android.media.MediaCodec
+import android.media.MediaFormat
+import android.util.Log
+import android.view.Surface
+import java.util.concurrent.TimeUnit
+import kotlin.math.max
+
+class VideoDecoderSurfaceThread(
+    private val surface: Surface,
+    mimeType: String,
+    width: Int,
+    height: Int,
+    rotation: Int, // 0, 90, 180, 270
+    videoFrameQueue: VideoFrameQueue,
+    videoDecoderListener: VideoDecoderListener,
+    videoDecoderType: DecoderType = DecoderType.HARDWARE,
+    videoFrameRateStabilization: Boolean = false,
+) : VideoDecodeThread(
+    mimeType, width, height, rotation, videoFrameQueue, videoDecoderListener, videoDecoderType
+) {
+
+    /**
+     * Presentation time (in RTP units converted to microseconds) of the first frame used as the
+     * PTS baseline.
+     */
+    private var streamStartPtsUs: Long? = null
+
+    /**
+     * Monotonic clock timestamp corresponding to streamStartPtsUs, used to map future frames
+     * to real time.
+     */
+    private var playbackStartRealtimeNs: Long? = null
+
+    /**
+     * Timestamp of the most recently released frame to enforce minimum spacing between consecutive
+     * frames.
+     */
+    private var lastFrameReleaseTimeNs: Long = Long.MIN_VALUE
+
+    /**
+     * Last presentation timestamp we processed; used to detect wrap-around or backwards jumps.
+     */
+    private var lastPresentationTimeUs: Long = Long.MIN_VALUE
+
+    init {
+        setVideoFrameRateStabilization(videoFrameRateStabilization)
+    }
+
+    override fun decoderCreated(mediaCodec: MediaCodec, mediaFormat: MediaFormat) {
+        if (DEBUG) Log.v(TAG, "decoderCreated()")
+        if (!surface.isValid) {
+            Log.e(TAG, "Surface invalid")
+        }
+        mediaCodec.configure(mediaFormat, surface, null, 0)
+        resetFrameTiming()
+    }
+
+    private fun releaseOutputBufferWithFrameRateStabilization(
+        mediaCodec: MediaCodec,
+        outIndex: Int,
+        bufferInfo: MediaCodec.BufferInfo
+    ) {
+        if (DEBUG) Log.v(TAG, "releaseOutputBufferWithFrameRateStabilization(outIndex=$outIndex)")
+
+        val ptsUs = bufferInfo.presentationTimeUs
+        val nowNs = System.nanoTime()
+
+        if (streamStartPtsUs == null || playbackStartRealtimeNs == null) {
+            // First frame (or after a reset): initialize all timing anchors.
+            streamStartPtsUs = ptsUs
+            playbackStartRealtimeNs = nowNs
+            lastFrameReleaseTimeNs = nowNs
+            lastPresentationTimeUs = ptsUs
+            mediaCodec.releaseOutputBuffer(outIndex, nowNs)
+            return
+        }
+
+        var targetNs = playbackStartRealtimeNs!! + (ptsUs - streamStartPtsUs!!) * 1000L
+        var adjustedNowNs = System.nanoTime()
+
+        if (lastPresentationTimeUs != Long.MIN_VALUE && ptsUs < lastPresentationTimeUs) {
+            // PTS went backwards (e.g. codec reordering). Re-base the clock to avoid negative deltas.
+            streamStartPtsUs = ptsUs
+            playbackStartRealtimeNs = adjustedNowNs
+            targetNs = adjustedNowNs
+        }
+
+        if (lastFrameReleaseTimeNs != Long.MIN_VALUE) {
+            // Ensure we never schedule two frames closer together than the min spacing.
+            targetNs = max(targetNs, lastFrameReleaseTimeNs + MIN_FRAME_SPACING_NS)
+        }
+
+        adjustedNowNs = System.nanoTime()
+        val latenessNs = adjustedNowNs - targetNs
+
+        if (latenessNs >= FRAME_DROP_THRESHOLD_NS) {
+            // Frame is critically late; drop to keep playback responsive.
+            mediaCodec.releaseOutputBuffer(outIndex, false)
+            lastFrameReleaseTimeNs = adjustedNowNs
+            return
+        }
+
+        var correctedTargetNs = targetNs
+        if (latenessNs > 0) {
+            // For mild lateness, shift the playback baseline forward so future frames stay aligned.
+            val correction = minOf(latenessNs, FRAME_DROP_THRESHOLD_NS)
+            playbackStartRealtimeNs = playbackStartRealtimeNs?.plus(correction)
+            correctedTargetNs += correction
+        }
+
+        if (correctedTargetNs <= adjustedNowNs + RENDER_EARLY_MARGIN_NS) {
+            // Already at/behind the target time: render immediately using the current VSYNC.
+            mediaCodec.releaseOutputBuffer(outIndex, true)
+            lastFrameReleaseTimeNs = adjustedNowNs
+        } else {
+            // Still early enough: hand the desired release timestamp to MediaCodec for VSYNC alignment.
+            mediaCodec.releaseOutputBuffer(outIndex, correctedTargetNs)
+            lastFrameReleaseTimeNs = correctedTargetNs
+        }
+
+        lastPresentationTimeUs = ptsUs
+    }
+
+    override fun releaseOutputBuffer(
+        mediaCodec: MediaCodec,
+        outIndex: Int,
+        bufferInfo: MediaCodec.BufferInfo,
+        render: Boolean
+    ) {
+        if (DEBUG) Log.v(TAG, "releaseOutputBuffer(outIndex=$outIndex, render=$render)")
+        if (!render || !surface.isValid) {
+            mediaCodec.releaseOutputBuffer(outIndex, false)
+            return
+        }
+
+        if (!hasVideoFrameRateStabilization()) {
+            mediaCodec.releaseOutputBuffer(outIndex, true)
+        } else {
+            releaseOutputBufferWithFrameRateStabilization(mediaCodec, outIndex, bufferInfo)
+        }
+    }
+
+    override fun decoderDestroyed(mediaCodec: MediaCodec) {
+        if (DEBUG) Log.v(TAG, "decoderDestroyed()")
+        resetFrameTiming()
+    }
+
+    private fun resetFrameTiming() {
+        if (DEBUG) Log.v(TAG, "resetFrameTiming()")
+        streamStartPtsUs = null
+        playbackStartRealtimeNs = null
+        lastFrameReleaseTimeNs = Long.MIN_VALUE
+        lastPresentationTimeUs = Long.MIN_VALUE
+    }
+
+    companion object {
+        private val FRAME_DROP_THRESHOLD_NS = TimeUnit.MILLISECONDS.toNanos(80)
+        private val MIN_FRAME_SPACING_NS = TimeUnit.MILLISECONDS.toNanos(1)
+        private val RENDER_EARLY_MARGIN_NS = TimeUnit.MILLISECONDS.toNanos(2)
+    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/parser/AacParser.java

@@ -0,0 +1,189 @@
+package com.alexvas.rtsp.parser;
+
+import android.annotation.SuppressLint;
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import androidx.media3.common.util.ParsableBitArray;
+import androidx.media3.common.util.ParsableByteArray;
+
+// https://tools.ietf.org/html/rfc3640
+//          +---------+-----------+-----------+---------------+
+//         | RTP     | AU Header | Auxiliary | Access Unit   |
+//         | Header  | Section   | Section   | Data Section  |
+//         +---------+-----------+-----------+---------------+
+//
+//                   <----------RTP Packet Payload----------->
+@SuppressLint("UnsafeOptInUsageError")
+public class AacParser extends AudioParser {
+
+    private static final String TAG = AacParser.class.getSimpleName();
+    private static final boolean DEBUG = false;
+
+    private final ParsableBitArray headerScratchBits;
+    private final ParsableByteArray headerScratchBytes;
+
+    private static final int MODE_LBR = 0;
+    private static final int MODE_HBR = 1;
+
+    // Number of bits for AAC AU sizes, indexed by mode (LBR and HBR)
+    private static final int[] NUM_BITS_AU_SIZES = {6, 13};
+
+    // Number of bits for AAC AU index(-delta), indexed by mode (LBR and HBR)
+    private static final int[] NUM_BITS_AU_INDEX = {2, 3};
+
+    // Frame Sizes for AAC AU fragments, indexed by mode (LBR and HBR)
+    private static final int[] FRAME_SIZES = {63, 8191};
+
+    private final int _aacMode;
+    private boolean completeFrameIndicator = true;
+
+    public AacParser(@NonNull String aacMode) {
+        _aacMode = aacMode.equalsIgnoreCase("AAC-lbr") ? MODE_LBR : MODE_HBR;
+
+        headerScratchBits = new ParsableBitArray();
+        headerScratchBytes = new ParsableByteArray();
+    }
+
+    @Override
+    @Nullable
+    public byte[] processRtpPacketAndGetSample(@NonNull byte[] data, int length) {
+        if (DEBUG)
+            Log.v(TAG, "processRtpPacketAndGetSample(length=" + length + ")");
+        int auHeadersCount = 1;
+        int numBitsAuSize = NUM_BITS_AU_SIZES[_aacMode];
+        int numBitsAuIndex = NUM_BITS_AU_INDEX[_aacMode];
+
+        ParsableByteArray packet = new ParsableByteArray(data, length);
+
+//      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
+//      |AU-headers-length|AU-header|AU-header|      |AU-header|padding|
+//      |                 |   (1)   |   (2)   |      |   (n)   | bits  |
+//      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- .. -+-+-+-+-+-+-+-+-+-+
+        int auHeadersLength = packet.readShort();//((data[0] & 0xFF) << 8) | (data[1] & 0xFF);
+        int auHeadersLengthBytes = (auHeadersLength + 7) / 8;
+
+        headerScratchBytes.reset(auHeadersLengthBytes);
+        packet.readBytes(headerScratchBytes.getData(), 0, auHeadersLengthBytes);
+        headerScratchBits.reset(headerScratchBytes.getData());
+
+        int bitsAvailable = auHeadersLength - (numBitsAuSize + numBitsAuIndex);
+
+        if (bitsAvailable > 0) {// && (numBitsAuSize + numBitsAuSize) > 0) {
+            auHeadersCount +=  bitsAvailable / (numBitsAuSize + numBitsAuIndex);
+        }
+
+        if (auHeadersCount == 1) {
+            int auSize = headerScratchBits.readBits(numBitsAuSize);
+            int auIndex = headerScratchBits.readBits(numBitsAuIndex);
+
+            if (completeFrameIndicator) {
+                if (auIndex == 0) {
+                    if (packet.bytesLeft() == auSize) {
+                        return handleSingleAacFrame(packet);
+
+                    } else {
+//                        handleFragmentationAacFrame(packet, auSize);
+                    }
+                }
+            } else {
+//                handleFragmentationAacFrame(packet, auSize);
+            }
+
+        } else {
+            if (completeFrameIndicator) {
+//                handleMultipleAacFrames(packet, auHeadersLength);
+            }
+        }
+//        byte[] auHeader = new byte[length-2-auHeadersLengthBytes];
+//        System.arraycopy(data,2-auHeadersLengthBytes, auHeader,0, auHeader.length);
+//        if (DEBUG)
+//            Log.d(TAG, "AU headers size: " + auHeadersLengthBytes + ", AU headers: " + auHeadersCount + ", sample length: " + auHeader.length);
+//        return auHeader;
+        return new byte[0];
+    }
+
+    private byte[] handleSingleAacFrame(ParsableByteArray packet) {
+        int length = packet.bytesLeft();
+        byte[] data = new byte[length];
+        System.arraycopy(packet.getData(), packet.getPosition(), data,0, data.length);
+        return data;
+    }
+
+//    private static final class AUHeader {
+//        private int size;
+//        private int index;
+//
+//        public AUHeader(int size, int index) {
+//            this.size = size;
+//            this.index = index;
+//        }
+//
+//        public int size() { return size; }
+//
+//        public int index() { return index; }
+//    }
+
+//    /**
+//     * Stores the consecutive fragment AU to reconstruct an AAC-Frame
+//     */
+//    private static final class FragmentedAacFrame {
+//        public byte[] auData;
+//        public int auLength;
+//        public int auSize;
+//
+//        private int sequence;
+//
+//        public FragmentedAacFrame(int frameSize) {
+//            // Initialize data
+//            auData = new byte[frameSize];
+//            sequence = -1;
+//        }
+//
+//        /**
+//         * Resets the buffer, clearing any data that it holds.
+//         */
+//        public void reset() {
+//            auLength = 0;
+//            auSize = 0;
+//            sequence = -1;
+//        }
+//
+//        public void sequence(int sequence) {
+//            this.sequence = sequence;
+//        }
+//
+//        public int sequence() {
+//            return sequence;
+//        }
+//
+//        /**
+//         * Called to add a fragment unit to fragmented AU.
+//         *
+//         * @param fragment Holds the data of fragment unit being passed.
+//         * @param offset The offset of the data in {@code fragment}.
+//         * @param limit The limit (exclusive) of the data in {@code fragment}.
+//         */
+//        public void appendFragment(byte[] fragment, int offset, int limit) {
+//            if (auSize == 0) {
+//                auSize = limit;
+//            } else if (auSize != limit) {
+//                reset();
+//            }
+//
+//            if (auData.length < auLength + limit) {
+//                auData = Arrays.copyOf(auData, (auLength + limit) * 2);
+//            }
+//
+//            System.arraycopy(fragment, offset, auData, auLength, limit);
+//            auLength += limit;
+//        }
+//
+//        public boolean isCompleted() {
+//            return auSize == auLength;
+//        }
+//    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/parser/AudioParser.kt

@@ -0,0 +1,8 @@
+package com.alexvas.rtsp.parser
+
+abstract class AudioParser {
+    abstract fun processRtpPacketAndGetSample(
+        data: ByteArray,
+        length: Int
+    ): ByteArray?
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/parser/G711Parser.kt

@@ -0,0 +1,11 @@
+package com.alexvas.rtsp.parser
+
+class G711Parser() : AudioParser() {
+    override fun processRtpPacketAndGetSample(
+        data: ByteArray,
+        length: Int
+    ): ByteArray? {
+        val g711Payload = data.copyOfRange(0, length)
+        return g711Payload
+    }
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/parser/RtpH264Parser.kt

@@ -0,0 +1,138 @@
+package com.alexvas.rtsp.parser
+
+import android.util.Log
+import com.alexvas.utils.VideoCodecUtils
+import com.alexvas.utils.VideoCodecUtils.getH264NalUnitTypeString
+import java.io.ByteArrayOutputStream
+
+class RtpH264Parser: RtpParser() {
+
+    private var stream = ByteArrayOutputStream()
+
+    override fun processRtpPacketAndGetNalUnit(data: ByteArray, length: Int, marker: Boolean): ByteArray? {
+        if (DEBUG) Log.v(TAG, "processRtpPacketAndGetNalUnit(data.size=${data.size}, length=$length, marker=$marker)")
+
+        val nalType = (data[0].toInt() and 0x1F).toByte()
+        val packFlag = data[1].toInt() and 0xC0
+        var nalUnit: ByteArray? = null
+
+        if (DEBUG)
+            Log.d(TAG, "\t\tNAL type: ${getH264NalUnitTypeString(nalType)}, pack flag: 0x${Integer.toHexString(packFlag).lowercase()}")
+
+        when (nalType) {
+            VideoCodecUtils.NAL_STAP_A, VideoCodecUtils.NAL_STAP_B -> {
+                // Not supported
+            }
+
+            VideoCodecUtils.NAL_MTAP16, VideoCodecUtils.NAL_MTAP24 -> {
+                // Not supported
+            }
+
+            VideoCodecUtils.NAL_FU_A -> {
+                when (packFlag) {
+                    0x80 -> {
+                        addStartFragmentedPacket(data, length)
+                    }
+
+                    0x00 -> {
+                        if (marker) {
+                            // Sometimes 0x40 end packet is not arrived. Use marker bit in this case
+                            // to finish fragmented packet.
+                            nalUnit = addEndFragmentedPacketAndCombine(data, length)
+                        } else {
+                            addMiddleFragmentedPacket(data, length)
+                        }
+                    }
+
+                    0x40 -> {
+                        nalUnit = addEndFragmentedPacketAndCombine(data, length)
+                    }
+                }
+            }
+
+            VideoCodecUtils.NAL_FU_B -> {
+                // Not supported
+            }
+
+            else -> {
+                nalUnit = processSingleFramePacket(data, length)
+                clearFragmentedBuffer()
+                if (DEBUG) Log.d(TAG, "Single NAL (${nalUnit.size})")
+            }
+        }
+        nalUnit?.let { stream.write(it) }
+        if (marker) {
+            val result = stream.toByteArray()
+            stream = ByteArrayOutputStream()
+            return result
+        }
+        return null
+    }
+
+    private fun addStartFragmentedPacket(data: ByteArray, length: Int) {
+        if (DEBUG) Log.v(TAG, "addStartFragmentedPacket(data.size=${data.size}, length=$length)")
+        fragmentedPackets = 0
+        fragmentedBufferLength = length - 1
+        fragmentedBuffer[0] = ByteArray(fragmentedBufferLength).apply {
+            this[0] = ((data[0].toInt() and 0xE0) or (data[1].toInt() and 0x1F)).toByte()
+        }
+        System.arraycopy(data, 2, fragmentedBuffer[0]!!, 1, length - 2)
+    }
+
+    private fun addMiddleFragmentedPacket(data: ByteArray, length: Int) {
+        if (DEBUG) Log.v(TAG, "addMiddleFragmentedPacket(data.size=${data.size}, length=$length)")
+        fragmentedPackets++
+        if (fragmentedPackets >= fragmentedBuffer.size) {
+            Log.e(TAG, "Too many middle packets. No NAL FU_A end packet received. Skipped RTP packet.")
+            fragmentedBuffer[0] = null
+        } else {
+            fragmentedBufferLength += length - 2
+            fragmentedBuffer[fragmentedPackets] = ByteArray(length - 2)
+            System.arraycopy(data, 2, fragmentedBuffer[fragmentedPackets]!!, 0, length - 2)
+        }
+    }
+
+    private fun addEndFragmentedPacketAndCombine(data: ByteArray, length: Int): ByteArray? {
+        if (DEBUG) Log.v(TAG, "addEndFragmentedPacketAndCombine(data.size=${data.size}, length=$length)")
+        var nalUnit: ByteArray? = null
+        var tmpLen: Int
+        if (fragmentedBuffer[0] == null) {
+            Log.e(TAG, "No NAL FU_A start packet received. Skipped RTP packet.")
+        } else {
+            nalUnit = ByteArray(fragmentedBufferLength + length + 2)
+            writeNalPrefix0001(nalUnit)
+            tmpLen = 4
+            // Write start and middle packets
+            for (i in 0 until fragmentedPackets + 1) {
+                fragmentedBuffer[i]!!.apply {
+                    System.arraycopy(
+                        this,
+                        0,
+                        nalUnit,
+                        tmpLen,
+                        this.size
+                    )
+                    tmpLen += this.size
+                }
+            }
+            // Write end packet
+            System.arraycopy(data, 2, nalUnit, tmpLen, length - 2)
+            clearFragmentedBuffer()
+            if (DEBUG) Log.d(TAG, "Fragmented NAL (${nalUnit.size})")
+        }
+        return nalUnit
+    }
+
+    private fun clearFragmentedBuffer() {
+        if (DEBUG) Log.v(TAG, "clearFragmentedBuffer()")
+        for (i in 0 until fragmentedPackets + 1) {
+            fragmentedBuffer[i] = null
+        }
+    }
+
+    companion object {
+        private val TAG: String = RtpH264Parser::class.java.simpleName
+        private const val DEBUG = false
+    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/parser/RtpH265Parser.kt

@@ -0,0 +1,139 @@
+package com.alexvas.rtsp.parser
+
+import android.util.Log
+import java.io.ByteArrayOutputStream
+
+class RtpH265Parser: RtpParser() {
+
+    private var stream = ByteArrayOutputStream()
+
+    override fun processRtpPacketAndGetNalUnit(data: ByteArray, length: Int, marker: Boolean): ByteArray? {
+        if (DEBUG) Log.v(TAG, "processRtpPacketAndGetNalUnit(length=$length, marker=$marker)")
+
+        // NAL Unit Header.type (RFC7798 Section 1.1.4).
+        val nalType = ((data[0].toInt() shr 1) and 0x3F).toByte()
+        var nalUnit: ByteArray? = null
+
+//        Log.d(TAG, "\t\tNAL type: ${VideoCodecUtils.getH265NalUnitTypeString(nalType)}")
+
+        if (nalType in 0..<RTP_PACKET_TYPE_AP) {
+            nalUnit = processSingleFramePacket(data, length)
+            clearFragmentedBuffer()
+            if (DEBUG) Log.d(TAG, "Single NAL (${nalUnit.size})")
+        } else if (nalType == RTP_PACKET_TYPE_AP) {
+            // TODO: Support AggregationPacket mode.
+            Log.e(TAG, "need to implement processAggregationPacket")
+        } else if (nalType == RTP_PACKET_TYPE_FU) {
+            nalUnit = processFragmentationUnitPacket(data, length, marker)
+        } else {
+            Log.e(TAG, "RTP H265 payload type [${nalType}] not supported.")
+        }
+        nalUnit?.let { stream.write(it) }
+        if (marker) {
+            val result = stream.toByteArray()
+            stream = ByteArrayOutputStream()
+            return result
+        }
+        return null
+    }
+
+    private fun processFragmentationUnitPacket(data: ByteArray, length: Int, marker: Boolean): ByteArray? {
+        if (DEBUG) Log.v(TAG, "processFragmentationUnitPacket(length=$length, marker=$marker)")
+
+        val fuHeader = data[2].toInt()
+        val isFirstFuPacket = (fuHeader and 0x80) > 0
+        val isLastFuPacket = (fuHeader and 0x40) > 0
+
+        if (isFirstFuPacket) {
+            addStartFragmentedPacket(data, length)
+        } else if (isLastFuPacket || marker) {
+            return addEndFragmentedPacketAndCombine(data, length)
+        } else {
+            addMiddleFragmentedPacket(data, length)
+        }
+        return null
+    }
+
+    private fun addStartFragmentedPacket(data: ByteArray, length: Int) {
+        if (DEBUG) Log.v(TAG, "addStartFragmentedPacket(data.size=${data.size}, length=$length)")
+        fragmentedPackets = 0
+        fragmentedBufferLength = length - 1
+        fragmentedBuffer[0] = ByteArray(fragmentedBufferLength).apply {
+
+            val tid = (data[1].toInt() and 0x7)
+            val fuHeader = data[2].toInt()
+            val nalUnitType = fuHeader and 0x3F
+
+            // Convert RTP header into HEVC NAL Unit header accoding to RFC7798 Section 1.1.4.
+            // RTP byte 0: ignored.
+            // RTP byte 1: repurposed as HEVC HALU byte 0, copy NALU type.
+            // RTP Byte 2: repurposed as HEVC HALU byte 1, layerId required to be zero, copying only tid.
+            // Set data position from byte 1 as byte 0 is ignored.
+            this[0] = (((nalUnitType shl 1) and 0x7F).toByte())
+            this[1] = tid.toByte()
+        }
+        System.arraycopy(data, 3, fragmentedBuffer[0]!!, 2, length - 3)
+    }
+
+    private fun addMiddleFragmentedPacket(data: ByteArray, length: Int) {
+        if (DEBUG) Log.v(TAG, "addMiddleFragmentedPacket(data.size=${data.size}, length=$length)")
+        fragmentedPackets++
+        if (fragmentedPackets >= fragmentedBuffer.size) {
+            Log.e(TAG, "Too many middle packets. No RTP_PACKET_TYPE_FU end packet received. Skipped RTP packet.")
+            fragmentedBuffer[0] = null
+        } else {
+            fragmentedBufferLength += length - 3
+            fragmentedBuffer[fragmentedPackets] = ByteArray(length - 3).apply {
+                System.arraycopy(data, 3, this, 0, length - 3)
+            }
+        }
+    }
+
+    private fun addEndFragmentedPacketAndCombine(data: ByteArray, length: Int): ByteArray? {
+        if (DEBUG) Log.v(TAG, "addEndFragmentedPacketAndCombine(data.size=${data.size}, length=$length)")
+        var nalUnit: ByteArray? = null
+        if (fragmentedBuffer[0] == null) {
+            Log.e(TAG, "No NAL FU_A start packet received. Skipped RTP packet.")
+        } else {
+            nalUnit = ByteArray(fragmentedBufferLength + length + 3)
+            writeNalPrefix0001(nalUnit)
+            var tmpLen = 4
+            // Write start and middle packets
+            for (i in 0 until fragmentedPackets + 1) {
+                fragmentedBuffer[i]!!.apply {
+                    System.arraycopy(
+                        this,
+                        0,
+                        nalUnit,
+                        tmpLen,
+                        this.size
+                    )
+                    tmpLen += this.size
+                }
+            }
+            // Write end packet
+            System.arraycopy(data, 3, nalUnit, tmpLen, length - 3)
+            clearFragmentedBuffer()
+            if (DEBUG) Log.d(TAG, "Fragmented NAL (${nalUnit.size})")
+        }
+        return nalUnit
+    }
+
+    private fun clearFragmentedBuffer() {
+        if (DEBUG) Log.v(TAG, "clearFragmentedBuffer()")
+        for (i in 0 until fragmentedPackets + 1) {
+            fragmentedBuffer[i] = null
+        }
+    }
+
+    companion object {
+        private val TAG: String = RtpH265Parser::class.java.simpleName
+        private const val DEBUG = false
+
+        /** Aggregation Packet. RFC7798 Section 4.4.2.  */
+        private const val RTP_PACKET_TYPE_AP: Byte = 48
+        /** Fragmentation Unit. RFC7798 Section 4.4.3. */
+        private const val RTP_PACKET_TYPE_FU: Byte = 49
+    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/parser/RtpHeaderParser.java

@@ -0,0 +1,145 @@
+package com.alexvas.rtsp.parser;
+
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.alexvas.utils.NetUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class RtpHeaderParser {
+
+    private static final String TAG = RtpHeaderParser.class.getSimpleName();
+    private static final boolean DEBUG = false;
+
+    private final static int RTP_HEADER_SIZE = 12;
+
+    public static class RtpHeader {
+        public int version;
+        public int padding;
+        public int extension;
+        public int cc;
+        public int marker;
+        public int payloadType;
+        public int sequenceNumber;
+        public long timeStamp;
+        public long ssrc;
+        public int payloadSize;
+
+        public long getTimestampMsec() {
+            return (long)(timeStamp * 11.111111);
+        }
+
+        // If RTP header found, return 4 bytes of the header
+        private static boolean searchForNextRtpHeader(@NonNull InputStream inputStream, @NonNull byte[] header /*out*/) throws IOException {
+            if (header.length < 4)
+                throw new IOException("Invalid allocated buffer size");
+
+            int bytesRemaining = 100000; // 100 KB max to check
+            boolean foundFirstByte = false;
+            boolean foundSecondByte = false;
+            byte[] oneByte = new byte[1];
+            // Search for {0x24, 0x00}
+            do {
+                if (bytesRemaining-- < 0)
+                    return false;
+                // Read 1 byte
+                NetUtils.readData(inputStream, oneByte, 0, 1);
+                if (foundFirstByte) {
+                    // Found 0x24. Checking for 0x00-0x02.
+                    if (oneByte[0] == 0x00)
+                        foundSecondByte = true;
+                    else
+                        foundFirstByte = false;
+                }
+                if (!foundFirstByte && oneByte[0] == 0x24) {
+                    // Found 0x24
+                    foundFirstByte = true;
+                }
+            } while (!foundSecondByte);
+            header[0] = 0x24;
+            header[1] = oneByte[0];
+            // Read 2 bytes more (packet size)
+            NetUtils.readData(inputStream, header, 2, 2);
+            return true;
+        }
+
+        @Nullable
+        private static RtpHeader parseData(@NonNull byte[] header, int packetSize) {
+            RtpHeader rtpHeader = new RtpHeader();
+            rtpHeader.version = (header[0] & 0xFF) >> 6;
+            if (rtpHeader.version != 2) {
+                if (DEBUG)
+                    Log.e(TAG,"Not a RTP packet (" + rtpHeader.version + ")");
+                return null;
+            }
+
+            // 80 60 40 91 fd ab d4 2a
+            // 80 c8 00 06
+            rtpHeader.padding = (header[0] & 0x20) >> 5; // 0b00100100
+            rtpHeader.extension = (header[0] & 0x10) >> 4;
+            rtpHeader.marker = (header[1] & 0x80) >> 7;
+            rtpHeader.payloadType = header[1] & 0x7F;
+            rtpHeader.sequenceNumber = (header[3] & 0xFF) + ((header[2] & 0xFF) << 8);
+            rtpHeader.timeStamp = (header[7] & 0xFF) + ((header[6] & 0xFF) << 8) + ((header[5] & 0xFF) << 16) + ((header[4] & 0xFF) << 24) & 0xffffffffL;
+            rtpHeader.ssrc = (header[7] & 0xFF) + ((header[6] & 0xFF) << 8) + ((header[5] & 0xFF) << 16) + ((header[4] & 0xFF) << 24) & 0xffffffffL;
+            rtpHeader.payloadSize = packetSize - RTP_HEADER_SIZE;
+            return rtpHeader;
+        }
+
+        private static int getPacketSize(@NonNull byte[] header) {
+            int packetSize = ((header[2] & 0xFF) << 8) | (header[3] & 0xFF);
+            if (DEBUG)
+                Log.d(TAG, "Packet size: " + packetSize);
+            return packetSize;
+        }
+
+        public void dumpHeader() {
+            Log.d("RTP","\t\tRTP header version: " + version
+                    + ", padding: " + padding
+                    + ", ext: " + extension
+                    + ", cc: " + cc
+                    + ", marker: " + marker
+                    + ", payload type: " + payloadType
+                    + ", seq num: " + sequenceNumber
+                    + ", ts: " + timeStamp
+                    + ", ssrc: " + ssrc
+                    + ", payload size: " + payloadSize);
+        }
+    }
+
+    @Nullable
+    public static RtpHeader readHeader(@NonNull InputStream inputStream) throws IOException {
+        // 24 01 00 1c 80 c8 00 06  7f 1d d2 c4
+        // 24 01 00 1c 80 c8 00 06  13 9b cf 60
+        // 24 02 01 12 80 e1 01 d2  00 07 43 f0
+        byte[] header = new byte[RTP_HEADER_SIZE];
+        // Skip 4 bytes (TCP only). No those bytes in UDP.
+        NetUtils.readData(inputStream, header, 0, 4);
+        if (DEBUG && header[0] == 0x24)
+            Log.d(TAG, header[1] == 0 ? "RTP packet" : "RTCP packet");
+
+        int packetSize = RtpHeader.getPacketSize(header);
+        if (DEBUG)
+            Log.d(TAG, "Packet size: " + packetSize);
+
+        if (NetUtils.readData(inputStream, header, 0, header.length) == header.length) {
+            RtpHeader rtpHeader = RtpHeader.parseData(header, packetSize);
+            if (rtpHeader == null) {
+                // Header not found. Possible keep-alive response. Search for another RTP header.
+                boolean foundHeader = RtpHeader.searchForNextRtpHeader(inputStream, header);
+                if (foundHeader) {
+                    packetSize = RtpHeader.getPacketSize(header);
+                    if (NetUtils.readData(inputStream, header, 0, header.length) == header.length)
+                        return RtpHeader.parseData(header, packetSize);
+                }
+            } else {
+                return rtpHeader;
+            }
+        }
+        return null;
+    }
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/parser/RtpParser.kt

@@ -0,0 +1,27 @@
+package com.alexvas.rtsp.parser
+
+abstract class RtpParser {
+
+    abstract fun processRtpPacketAndGetNalUnit(data: ByteArray, length: Int, marker: Boolean): ByteArray?
+
+    // TODO Use already allocated buffer with RtpPacket.MAX_SIZE = 65507
+    // Used only for fragmented packets
+    protected val fragmentedBuffer = arrayOfNulls<ByteArray>(1024)
+    protected var fragmentedBufferLength = 0
+    protected var fragmentedPackets = 0
+
+    protected fun writeNalPrefix0001(buffer: ByteArray) {
+        buffer[0] = 0x00
+        buffer[1] = 0x00
+        buffer[2] = 0x00
+        buffer[3] = 0x01
+    }
+
+    protected fun processSingleFramePacket(data: ByteArray, length: Int): ByteArray {
+        return ByteArray(4 + length).apply {
+            writeNalPrefix0001(this)
+            System.arraycopy(data, 0, this, 4, length)
+        }
+    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/widget/RtspListeners.kt

@@ -0,0 +1,24 @@
+package com.alexvas.rtsp.widget
+
+/**
+ * Listener for getting RTSP status update.
+ */
+interface RtspStatusListener {
+    fun onRtspStatusConnecting() {}
+    fun onRtspStatusConnected() {}
+    fun onRtspStatusDisconnecting() {}
+    fun onRtspStatusDisconnected() {}
+    fun onRtspStatusFailedUnauthorized() {}
+    fun onRtspStatusFailed(message: String?) {}
+    fun onRtspFirstFrameRendered() {}
+    fun onRtspFrameSizeChanged(width: Int, height: Int) {}
+}
+
+/**
+ * Listener for getting RTSP raw data, e.g. for recording.
+ */
+interface RtspDataListener {
+    fun onRtspDataVideoNalUnitReceived(data: ByteArray, offset: Int, length: Int, timestamp: Long) {}
+    fun onRtspDataAudioSampleReceived(data: ByteArray, offset: Int, length: Int, timestamp: Long) {}
+    fun onRtspDataApplicationDataReceived(data: ByteArray, offset: Int, length: Int, timestamp: Long) {}
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/widget/RtspProcessor.kt

@@ -0,0 +1,623 @@
+package com.alexvas.rtsp.widget
+
+import android.annotation.SuppressLint
+import android.media.MediaFormat
+import android.net.Uri
+import android.os.Handler
+import android.os.Looper
+import android.util.Log
+import androidx.media3.container.NalUnitUtil
+import com.alexvas.rtsp.RtspClient
+import com.alexvas.rtsp.RtspClient.SdpInfo
+import com.alexvas.rtsp.codec.AudioCodecType
+import com.alexvas.rtsp.codec.AudioDecodeThread
+import com.alexvas.rtsp.codec.AudioFrameQueue
+import com.alexvas.rtsp.codec.FrameQueue
+import com.alexvas.rtsp.codec.VideoCodecType
+import com.alexvas.rtsp.codec.VideoDecodeThread
+import com.alexvas.rtsp.codec.VideoDecodeThread.DecoderType
+import com.alexvas.rtsp.codec.VideoDecodeThread.VideoDecoderListener
+import com.alexvas.rtsp.codec.VideoFrameQueue
+import com.alexvas.utils.NetUtils
+import com.alexvas.utils.VideoCodecUtils
+import org.jcodec.codecs.h264.io.model.SeqParameterSet
+import org.jcodec.codecs.h264.io.model.VUIParameters
+import java.net.Socket
+import java.nio.ByteBuffer
+import java.util.concurrent.atomic.AtomicBoolean
+import kotlin.math.min
+
+class RtspProcessor(
+    private var onVideoDecoderCreateRequested: ((
+        videoMimeType: String,
+        videoRotation: Int, // 0, 90, 180, 270
+        videoFrameQueue: VideoFrameQueue,
+        videoDecoderListener: VideoDecoderListener,
+        videoDecoderType: DecoderType,
+        videoFrameRateStabilization: Boolean,
+    ) -> VideoDecodeThread)
+) {
+
+    class Statistics {
+        var videoDecoderType = DecoderType.HARDWARE
+        var videoDecoderName: String? = null
+        var videoDecoderLatencyMsec = -1
+        var networkLatencyMsec = -1
+    }
+
+    private lateinit var uri: Uri
+    private var username: String? = null
+    private var password: String? = null
+    private var userAgent: String? = null
+    private var requestVideo = true
+    private var requestAudio = true
+    private var requestApplication = false
+    private var rtspThread: RtspThread? = null
+    // 本地修改（相对上游）：队列容量 60 -> 20，压缩解码侧缓冲。解码线程无播放时钟、
+    // 按最快速度取帧，队列正常情况下近乎为空，容量仅作抖动兜底，调小不丢帧但压低积压延迟。
+    private var videoFrameQueue = VideoFrameQueue(20)
+    private var audioFrameQueue = AudioFrameQueue(10)
+    private var videoDecodeThread: VideoDecodeThread? = null
+    private var audioDecodeThread: AudioDecodeThread? = null
+    private val uiHandler = Handler(Looper.getMainLooper())
+    private var videoMimeType: String = "video/avc"
+    private var audioMimeType: String = ""
+    private var audioSampleRate: Int = 0
+    private var audioChannelCount: Int = 0
+    private var audioCodecConfig: ByteArray? = null
+    private var firstFrameRendered = false
+    var statistics = Statistics()
+        get() {
+            videoDecodeThread?.let { decoder ->
+                field.apply {
+                    networkLatencyMsec = decoder.getCurrentNetworkLatencyMsec()
+                    videoDecoderLatencyMsec = decoder.getCurrentVideoDecoderLatencyMsec()
+                    videoDecoderType = decoder.getCurrentVideoDecoderType()
+                    videoDecoderName = decoder.getCurrentVideoDecoderName()
+                }
+            }
+            return field
+        }
+        private set
+
+    /** Read and connect timeout for socket in msec. */
+    private var socketTimeoutMsec: Int = 5000
+
+    /**
+     * Show more debug info on console on runtime.
+     */
+    var debug = false
+
+    /**
+     * Video rotation in degrees. Allowed values: 0, 90, 180, 270.
+     * Note that not all hardware video decoders support rotation.
+     */
+    var videoRotation = 0
+        set(value) {
+            if (value == 0 || value == 90 || value == 180 || value == 270)
+                field = value
+        }
+
+    /**
+     * Requested video decoder type.
+     */
+    var videoDecoderType = DecoderType.HARDWARE
+
+    /**
+     * Try to modify SPS frame coming from camera with low-latency parameters to decrease video
+     * decoding latency.
+     * If SPS frame param num_ref_frames is equal to 1 or more, set it to 0. That should decrease
+     * decoder latency by 2x times on some hardware decoders.
+     */
+    var experimentalUpdateSpsFrameWithLowLatencyParams = false
+
+    /**
+     * Enables the playback smoothing logic inside the video decoder.
+     */
+    var videoFrameRateStabilization: Boolean = false
+        set(value) {
+            field = value
+            videoDecodeThread?.setVideoFrameRateStabilization(value)
+        }
+
+    /**
+     * Status listener for getting RTSP event updates.
+     */
+    var statusListener: RtspStatusListener? = null
+
+    /**
+     * Listener for getting raw data, e.g. for recording.
+     */
+    var dataListener: RtspDataListener? = null
+
+    private val proxyClientListener = object: RtspClient.RtspClientListener {
+
+        override fun onRtspConnecting() {
+            if (DEBUG) Log.v(TAG, "onRtspConnecting()")
+            uiHandler.post {
+                statusListener?.onRtspStatusConnecting()
+            }
+        }
+
+        override fun onRtspConnected(sdpInfo: SdpInfo) {
+            if (DEBUG) Log.v(TAG, "onRtspConnected()")
+            if (sdpInfo.videoTrack != null) {
+                videoFrameQueue.clear()
+                when (sdpInfo.videoTrack?.videoCodec) {
+                    RtspClient.VIDEO_CODEC_H264 -> videoMimeType = MediaFormat.MIMETYPE_VIDEO_AVC
+                    RtspClient.VIDEO_CODEC_H265 -> videoMimeType = MediaFormat.MIMETYPE_VIDEO_HEVC
+                }
+                when (sdpInfo.audioTrack?.audioCodec) {
+                    RtspClient.AUDIO_CODEC_AAC -> audioMimeType = MediaFormat.MIMETYPE_AUDIO_AAC
+                    RtspClient.AUDIO_CODEC_OPUS -> audioMimeType = MediaFormat.MIMETYPE_AUDIO_OPUS
+                    RtspClient.AUDIO_CODEC_G711_ULAW -> audioMimeType = MediaFormat.MIMETYPE_AUDIO_G711_MLAW
+                    RtspClient.AUDIO_CODEC_G711_ALAW -> audioMimeType = MediaFormat.MIMETYPE_AUDIO_G711_ALAW
+                }
+                val sps: ByteArray? = sdpInfo.videoTrack?.sps
+                val pps: ByteArray? = sdpInfo.videoTrack?.pps
+                // Initialize decoder
+                @SuppressLint("UnsafeOptInUsageError")
+                if (sps != null && pps != null) {
+                    // 本地修改（相对上游）：H.265 的 CSD 参数集顺序必须为 VPS→SPS→PPS（ISO/IEC 14496-15），
+                    // 上游拼接顺序 sps+pps+vps 会导致 H.265 起播黑屏。H.264 无 VPS，顺序不变。
+                    val vps: ByteArray = sdpInfo.videoTrack?.vps ?: ByteArray(0)
+                    val data = ByteArray(sps.size + pps.size + vps.size)
+                    var offset = 0
+                    vps.copyInto(data, offset, 0, vps.size)
+                    offset += vps.size
+                    sps.copyInto(data, offset, 0, sps.size)
+                    offset += sps.size
+                    pps.copyInto(data, offset, 0, pps.size)
+                    offset += pps.size
+                    videoFrameQueue.push(
+                        FrameQueue.VideoFrame(
+                            // 本地修改（相对上游）：按实际 MIME 标记 codecType，上游硬编码 H264
+                            // 会导致 H.265 流无法从 SPS 解析宽高（解码线程按 codecType 决定解析方式）。
+                            if (videoMimeType == MediaFormat.MIMETYPE_VIDEO_HEVC) VideoCodecType.H265 else VideoCodecType.H264,
+                            isKeyframe = true,
+                            data,
+                            0,
+                            data.size,
+                            0
+                        )
+                    )
+                    try {
+                        val startNalOffset = if (sps[3] == 1.toByte()) 5 else 4
+                        val spsData = NalUnitUtil.parseSpsNalUnitPayload(
+                            data, startNalOffset, data.size - startNalOffset)
+                        if (spsData.maxNumReorderFrames > 0) {
+                            Log.w(
+                                TAG, "SPS frame param max_num_reorder_frames=" +
+                                    "${spsData.maxNumReorderFrames} is too high" +
+                                    " for low latency decoding (expecting 0)."
+                            )
+                        }
+                        if (debug) {
+                            Log.d(TAG, "SPS frame: ${sps.toHexString(0, sps.size)}")
+                            Log.d(TAG, "\t${spsData.spsDataToString()}")
+                            Log.d(TAG, "PPS frame: ${pps.toHexString(0, pps.size)}")
+                            if (vps.isNotEmpty())
+                                Log.d(TAG, "VPS frame: ${vps.toHexString(0, vps.size)}")
+                        }
+                    } catch (e: Exception) {
+                        e.printStackTrace()
+                    }
+                } else {
+                    if (DEBUG) Log.d(TAG, "RTSP SPS and PPS NAL units missed in SDP")
+                }
+            }
+            if (sdpInfo.audioTrack != null) {
+                audioFrameQueue.clear()
+                when (sdpInfo.audioTrack?.audioCodec) {
+                    RtspClient.AUDIO_CODEC_AAC -> audioMimeType = MediaFormat.MIMETYPE_AUDIO_AAC
+                    RtspClient.AUDIO_CODEC_OPUS -> audioMimeType = MediaFormat.MIMETYPE_AUDIO_OPUS
+                }
+                audioSampleRate = sdpInfo.audioTrack?.sampleRateHz!!
+                audioChannelCount = sdpInfo.audioTrack?.channels!!
+                audioCodecConfig = sdpInfo.audioTrack?.config
+            }
+            onRtspClientConnected()
+            uiHandler.post {
+                statusListener?.onRtspStatusConnected()
+            }
+        }
+
+        private var framesPerGop = 0
+
+        override fun onRtspVideoNalUnitReceived(data: ByteArray, offset: Int, length: Int, timestamp: Long) {
+            if (DEBUG) Log.v(TAG, "onRtspVideoNalUnitReceived(data.size=${data.size}, length=$length, timestamp=$timestamp)")
+
+            val isH265 = videoMimeType == MediaFormat.MIMETYPE_VIDEO_HEVC
+            // Search for NAL_IDR_SLICE within first 1KB maximum
+            val isKeyframe = VideoCodecUtils.isAnyKeyFrame(data, offset, min(length, 1000), isH265)
+
+            var videoFrame = FrameQueue.VideoFrame(
+                VideoCodecType.H264,
+                isKeyframe,
+                data,
+                offset,
+                length,
+                timestamp,
+                capturedTimestampMs = System.currentTimeMillis()
+            )
+            if (isKeyframe && experimentalUpdateSpsFrameWithLowLatencyParams) {
+                videoFrame = getNewLowLatencyFrameFromKeyFrame(videoFrame)
+            }
+
+            if (debug) {
+                nalUnitsFound.clear()
+                VideoCodecUtils.getNalUnits(videoFrame.data, videoFrame.offset, videoFrame.length, nalUnitsFound, isH265)
+                var b = StringBuilder()
+                for (nal in nalUnitsFound) {
+                    b
+                    .append(if (isH265)
+                            VideoCodecUtils.getH265NalUnitTypeString(nal.type)
+                        else
+                            VideoCodecUtils.getH264NalUnitTypeString(nal.type))
+                    .append(" (${nal.length}), ")
+                }
+                if (b.length > 2)
+                    b = b.removeRange(b.length - 2, b.length) as StringBuilder
+                Log.d(TAG, "NALs: $b")
+                @SuppressLint("UnsafeOptInUsageError")
+                if (isKeyframe) {
+                    val sps = VideoCodecUtils.getSpsNalUnitFromArray(
+                        videoFrame.data,
+                        videoFrame.offset,
+                        // Check only first 100 bytes maximum. That's enough for finding SPS NAL unit.
+                        Integer.min(videoFrame.length, VideoCodecUtils.MAX_NAL_SPS_SIZE),
+                        isH265
+                    )
+                    Log.d(TAG,
+                        "\tKey frame received (${videoFrame.length} bytes, ts=$timestamp," +
+                        " ${sps?.width}x${sps?.height}," +
+                        " GoP=$framesPerGop," +
+                        " profile=${sps?.profileIdc}, level=${sps?.levelIdc})")
+                    framesPerGop = 0
+                } else {
+                    framesPerGop++
+                }
+            }
+
+            videoFrameQueue.push(videoFrame)
+            dataListener?.onRtspDataVideoNalUnitReceived(
+                videoFrame.data,
+                videoFrame.offset,
+                videoFrame.length,
+                timestamp)
+        }
+
+        override fun onRtspAudioSampleReceived(data: ByteArray, offset: Int, length: Int, timestamp: Long) {
+            if (DEBUG) Log.v(TAG, "onRtspAudioSampleReceived(length=$length, timestamp=$timestamp)")
+            if (length > 0) {
+                audioFrameQueue.push(
+                    FrameQueue.AudioFrame(
+                        AudioCodecType.AAC_LC,
+                        data, offset,
+                        length,
+                        timestamp
+                    )
+                )
+            }
+            dataListener?.onRtspDataAudioSampleReceived(data, offset, length, timestamp)
+        }
+
+        override fun onRtspApplicationDataReceived(data: ByteArray, offset: Int, length: Int, timestamp: Long) {
+            if (DEBUG) Log.v(TAG, "onRtspApplicationDataReceived(length=$length, timestamp=$timestamp)")
+            dataListener?.onRtspDataApplicationDataReceived(data, offset, length, timestamp)
+        }
+
+        override fun onRtspDisconnecting() {
+            if (DEBUG) Log.v(TAG, "onRtspDisconnecting()")
+            uiHandler.post {
+                statusListener?.onRtspStatusDisconnecting()
+            }
+        }
+
+        override fun onRtspDisconnected() {
+            if (DEBUG) Log.v(TAG, "onRtspDisconnected()")
+            uiHandler.post {
+                statusListener?.onRtspStatusDisconnected()
+            }
+        }
+
+        override fun onRtspFailedUnauthorized() {
+            if (DEBUG) Log.v(TAG, "onRtspFailedUnauthorized()")
+            uiHandler.post {
+                statusListener?.onRtspStatusFailedUnauthorized()
+            }
+        }
+
+        override fun onRtspFailed(message: String?) {
+            if (DEBUG) Log.v(TAG, "onRtspFailed(message='$message')")
+            uiHandler.post {
+                statusListener?.onRtspStatusFailed(message)
+            }
+        }
+    }
+
+    inner class RtspThread: Thread() {
+        private var rtspStopped = AtomicBoolean(false)
+
+        fun stopAsync() {
+            if (DEBUG) Log.v(TAG, "stopAsync()")
+            rtspStopped.set(true)
+            // Wake up sleep() code
+            interrupt()
+        }
+
+        override fun run() {
+            onRtspClientStarted()
+            val port = if (uri.port == -1) DEFAULT_RTSP_PORT else uri.port
+            var socket: Socket? = null
+            try {
+                if (DEBUG) Log.d(TAG, "Connecting to ${uri.host.toString()}:$port...")
+
+                socket = if (uri.scheme?.lowercase() == "rtsps")
+                    NetUtils.createSslSocketAndConnect(
+                        uri.host.toString(),
+                        port,
+                        socketTimeoutMsec
+                    )
+                else
+                    NetUtils.createSocketAndConnect(
+                        uri.host.toString(),
+                        port,
+                        socketTimeoutMsec
+                    )
+
+                // Blocking call until stopped variable is true or connection failed
+                val rtspClient = RtspClient.Builder(socket, uri.toString(), rtspStopped, proxyClientListener)
+                    .requestVideo(requestVideo)
+                    .requestAudio(requestAudio)
+                    .requestApplication(requestApplication)
+                    .withDebug(debug)
+                    .withUserAgent(userAgent)
+                    .withCredentials(username, password)
+                    .build()
+                rtspClient.execute()
+            } catch (e: Exception) {
+                e.printStackTrace()
+                uiHandler.post { proxyClientListener.onRtspFailed(e.message) }
+            } finally {
+                NetUtils.closeSocket(socket)
+            }
+            onRtspClientStopped()
+        }
+    }
+
+    private val videoDecoderListener = object: VideoDecoderListener {
+        override fun onVideoDecoderStarted() {
+            if (DEBUG) Log.v(TAG, "onVideoDecoderStarted()")
+        }
+
+        override fun onVideoDecoderStopped() {
+            if (DEBUG) Log.v(TAG, "onVideoDecoderStopped()")
+        }
+
+        override fun onVideoDecoderFailed(message: String?) {
+            if (DEBUG) Log.e(TAG, "onVideoDecoderFailed(message='$message')")
+        }
+
+        override fun onVideoDecoderFormatChanged(width: Int, height: Int) {
+            if (DEBUG) Log.v(TAG, "onVideoDecoderFormatChanged(width=$width, height=$height)")
+            statusListener?.onRtspFrameSizeChanged(width, height)
+        }
+
+        override fun onVideoDecoderFirstFrameRendered() {
+            if (DEBUG) Log.v(TAG, "onVideoDecoderFirstFrameDecoded()")
+            if (!firstFrameRendered) statusListener?.onRtspFirstFrameRendered()
+            firstFrameRendered = true
+        }
+    }
+
+
+    private fun onRtspClientStarted() {
+        if (DEBUG) Log.v(TAG, "onRtspClientStarted()")
+//        uiHandler.post { statusListener?.onRtspStatusConnected() }
+    }
+
+    private fun onRtspClientConnected() {
+        if (DEBUG) Log.v(TAG, "onRtspClientConnected()")
+        if (videoMimeType.isNotEmpty()) {
+            firstFrameRendered = false
+            Log.i(TAG, "Starting video decoder with mime type \"$videoMimeType\"")
+            videoDecodeThread = onVideoDecoderCreateRequested.invoke(
+                videoMimeType,
+                videoRotation,
+                videoFrameQueue,
+                videoDecoderListener,
+                videoDecoderType,
+                videoFrameRateStabilization,
+            )
+            videoDecodeThread!!.apply {
+                name = "RTSP video thread [${getUriName()}]"
+                start()
+            }
+        }
+        if (audioMimeType.isNotEmpty() /*&& checkAudio!!.isChecked*/) {
+            Log.i(TAG, "Starting audio decoder with mime type \"$audioMimeType\"")
+            audioDecodeThread = AudioDecodeThread(
+                audioMimeType, audioSampleRate, audioChannelCount, audioCodecConfig, audioFrameQueue)
+            audioDecodeThread!!.apply {
+                name = "RTSP audio thread [${getUriName()}]"
+                start()
+            }
+        }
+    }
+
+    private fun onRtspClientStopped() {
+        if (DEBUG) Log.v(TAG, "onRtspClientStopped()")
+        stopDecoders()
+        rtspThread = null
+//        uiHandler.post { statusListener?.onRtspStatusDisconnected() }
+    }
+
+    fun init(uri: Uri, username: String?, password: String?, userAgent: String? = null, socketTimeout: Int = DEFAULT_SOCKET_TIMEOUT) {
+        if (DEBUG) Log.v(TAG, "init(uri='$uri', username='$username', password='$password', userAgent='$userAgent', socketTimeout=$socketTimeout)")
+        this.uri = uri
+        this.username = username
+        this.password = password
+        this.userAgent = userAgent
+        this.socketTimeoutMsec = socketTimeout
+    }
+
+    fun start(requestVideo: Boolean, requestAudio: Boolean, requestApplication: Boolean = false) {
+        if (DEBUG) Log.v(TAG, "start(requestVideo=$requestVideo, requestAudio=$requestAudio, requestApplication=$requestApplication)")
+        if (rtspThread != null) rtspThread?.stopAsync()
+        this.requestVideo = requestVideo
+        this.requestAudio = requestAudio
+        this.requestApplication = requestApplication
+        rtspThread = RtspThread().apply {
+            name = "RTSP IO thread [${getUriName()}]"
+            start()
+        }
+    }
+
+    fun stop() {
+        if (DEBUG) Log.v(TAG, "stop()")
+        rtspThread?.stopAsync()
+        rtspThread = null
+    }
+
+    fun isStarted(): Boolean {
+        return rtspThread != null
+    }
+
+    fun stopDecoders() {
+        if (DEBUG) Log.v(TAG, "stopDecoders()")
+        videoDecodeThread?.stopAsync()
+        videoDecodeThread = null
+        audioDecodeThread?.stopAsync()
+        audioDecodeThread = null
+    }
+
+// Cached values
+    private val nalUnitsFound = ArrayList<VideoCodecUtils.NalUnit>()
+    private val spsBufferReadFrame = ByteBuffer.allocate(VideoCodecUtils.MAX_NAL_SPS_SIZE)
+    private val spsBufferWriteFrame = ByteBuffer.allocate(VideoCodecUtils.MAX_NAL_SPS_SIZE)
+
+    /**
+     * Try to get a new frame keyframe (SPS+PPS+IDR) with low latency modified SPS frame.
+     * If modification failed, original frame will be returned.
+     * Inspired by https://webrtc.googlesource.com/src/+/refs/heads/main/common_video/h264/sps_vui_rewriter.cc#400
+     */
+    private fun getNewLowLatencyFrameFromKeyFrame(frame: FrameQueue.VideoFrame): FrameQueue.VideoFrame {
+        try {
+            // Support only H264 for now
+            if (frame.codecType == VideoCodecType.H265)
+                return frame
+
+            nalUnitsFound.clear()
+            VideoCodecUtils.getNalUnits(frame.data, frame.offset, frame.length, nalUnitsFound, isH265 = false)
+
+            val oldSpsNalUnit = nalUnitsFound.firstOrNull { it.type == VideoCodecUtils.NAL_SPS }
+
+            // SPS frame not found. Return original frame.
+            if (oldSpsNalUnit == null)
+                return frame
+
+            spsBufferReadFrame.apply {
+                rewind()
+                put(frame.data, oldSpsNalUnit.offset + 5,
+                    Integer.min(oldSpsNalUnit.length, VideoCodecUtils.MAX_NAL_SPS_SIZE)
+                )
+                rewind()
+            }
+            // Read SPS frame
+            val spsSet = SeqParameterSet.read(spsBufferReadFrame)
+
+            // adding VUI might decrease latency for some streams, if max_dec_frame_buffering is set properly
+            // https://community.intel.com/t5/Media-Intel-oneAPI-Video/h-264-decoder-gives-two-frames-latency-while-decoding-a-stream/td-p/1099694
+            // https://github.com/Consti10/LiveVideo10ms/blob/master/VideoCore/src/main/cpp/NALU/H26X.hpp
+            fun modifyVui() {
+//                spsSet.vuiParams = VUIParameters()
+                spsSet.vuiParams.apply {
+//                    videoSignalTypePresentFlag = true
+//                    videoFormat = 5
+//                    colourDescriptionPresentFlag = true
+//                    matrixCoefficients = 5
+//                    timingInfoPresentFlag = true
+//                    numUnitsInTick = 1
+//                    timeScale = 120
+//                    fixedFrameRateFlag = true
+                    bitstreamRestriction = VUIParameters.BitstreamRestriction().apply {
+//                        motionVectorsOverPicBoundariesFlag = true
+//                        log2MaxMvLengthHorizontal = 16
+//                        log2MaxMvLengthVertical = 16
+                        maxDecFrameBuffering = 1
+                        numReorderFrames = 0
+                    }
+                }
+            }
+            modifyVui()
+
+            // Write SPS frame
+            spsBufferWriteFrame.rewind()
+            spsSet.write(spsBufferWriteFrame)
+
+            val newSpsNalUnitSize = spsBufferWriteFrame.position()
+
+            if (oldSpsNalUnit.length > -1) {
+                val newSize = frame.length - oldSpsNalUnit.length + newSpsNalUnitSize
+                val newData = ByteArray(newSize + 5)
+                var newDataOffset = 0
+
+                for (nalUnit in nalUnitsFound) {
+                    when (nalUnit.type) {
+                        VideoCodecUtils.NAL_SPS -> {
+                            // Write NAL header + SPS frame type
+                            val b = byteArrayOf(0x00, 0x00, 0x00, 0x01, 0x27)
+                            b.copyInto(newData, newDataOffset, 0, b.size)
+                            newDataOffset += b.size
+                            // Write SPS frame body
+                            spsBufferWriteFrame.apply {
+                                rewind()
+                                get(newData, newDataOffset, newSpsNalUnitSize)
+                            }
+                            newDataOffset += newSpsNalUnitSize
+                        }
+
+                        else -> {
+                            frame.data.copyInto(
+                                newData,
+                                newDataOffset,
+                                nalUnit.offset,
+                                nalUnit.offset + nalUnit.length
+                            )
+                            newDataOffset += nalUnit.length
+                        }
+                    }
+                }
+                // Create SPS+PPS+IDR frame with newly modified SPS frame data
+                return FrameQueue.VideoFrame(
+                    frame.codecType,
+                    frame.isKeyframe,
+                    newData,
+                    0,
+                    newData.size,
+                    frame.timestampMs,
+                    frame.capturedTimestampMs
+                )
+            }
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to create low-latency keyframe", e)
+        }
+        return frame
+    }
+
+    private fun getUriName(): String {
+        val port = if (uri.port == -1) DEFAULT_RTSP_PORT else uri.port
+        return "${uri.host.toString()}:$port"
+    }
+
+    companion object {
+        private val TAG: String = RtspProcessor::class.java.simpleName
+        private const val DEBUG = false
+
+        private const val DEFAULT_RTSP_PORT = 554
+
+        const val DEFAULT_SOCKET_TIMEOUT = 5000
+    }
+
+}

rtspclientlibrary/src/main/java/com/alexvas/rtsp/widget/RtspSurfaceView.kt

@@ -0,0 +1,190 @@
+package com.alexvas.rtsp.widget
+
+import android.content.Context
+import android.net.Uri
+import android.util.AttributeSet
+import android.util.Log
+import android.view.SurfaceHolder
+import android.view.SurfaceView
+import androidx.annotation.OptIn
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.container.NalUnitUtil
+import com.alexvas.rtsp.codec.VideoDecodeThread.DecoderType
+import com.alexvas.rtsp.codec.VideoDecoderSurfaceThread
+import com.alexvas.rtsp.widget.RtspProcessor.Statistics
+import com.limelight.binding.video.MediaCodecHelper
+
+/**
+ * Low latency RTSP stream playback on surface view.
+ */
+open class RtspSurfaceView: SurfaceView {
+
+    private var surfaceWidth = 1920
+    private var surfaceHeight = 1080
+
+    private var rtspProcessor = RtspProcessor(
+        onVideoDecoderCreateRequested = {
+                videoMimeType,
+                videoRotation,
+                videoFrameQueue,
+                videoDecoderListener,
+                videoDecoderType,
+                videoFrameRateStabilization,
+            ->
+            VideoDecoderSurfaceThread(
+                holder.surface,
+                videoMimeType,
+                surfaceWidth,
+                surfaceHeight,
+                videoRotation,
+                videoFrameQueue,
+                videoDecoderListener,
+                videoDecoderType,
+                videoFrameRateStabilization,
+            )
+        }
+    )
+
+    var statistics = Statistics()
+        get() = rtspProcessor.statistics
+        private set
+
+    var videoRotation: Int
+        get() = rtspProcessor.videoRotation
+        set(value) { rtspProcessor.videoRotation = value }
+
+    var videoDecoderType: DecoderType
+        get() = rtspProcessor.videoDecoderType
+        set(value) { rtspProcessor.videoDecoderType = value }
+
+    var experimentalUpdateSpsFrameWithLowLatencyParams: Boolean
+        get() = rtspProcessor.experimentalUpdateSpsFrameWithLowLatencyParams
+        set(value) { rtspProcessor.experimentalUpdateSpsFrameWithLowLatencyParams = value }
+
+    var debug: Boolean
+        get() = rtspProcessor.debug
+        set(value) { rtspProcessor.debug = value }
+
+    /** Enables decoder-side playback smoothing. Disabled by default. */
+    var videoFrameRateStabilization: Boolean
+        get() = rtspProcessor.videoFrameRateStabilization
+        set(value) { rtspProcessor.videoFrameRateStabilization = value }
+
+    private val surfaceCallback = object: SurfaceHolder.Callback {
+        override fun surfaceCreated(holder: SurfaceHolder) {
+            if (DEBUG) Log.v(TAG, "surfaceCreated()")
+        }
+
+        override fun surfaceChanged(holder: SurfaceHolder, format: Int, width: Int, height: Int) {
+            if (DEBUG) Log.v(TAG, "surfaceChanged(format=$format, width=$width, height=$height)")
+            surfaceWidth = width
+            surfaceHeight = height
+        }
+
+        override fun surfaceDestroyed(holder: SurfaceHolder) {
+            if (DEBUG) Log.v(TAG, "surfaceDestroyed()")
+            rtspProcessor.stopDecoders()
+        }
+    }
+
+    constructor(context: Context) : super(context) {
+        initView(context, null, 0)
+    }
+
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) {
+        initView(context, attrs, 0)
+    }
+
+    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr) {
+        initView(context, attrs, defStyleAttr)
+    }
+
+    private fun initView(context: Context, attrs: AttributeSet?, defStyleAttr: Int) {
+        if (DEBUG) Log.v(TAG, "initView()")
+        MediaCodecHelper.initialize(context, /*glRenderer*/ "")
+        holder.addCallback(surfaceCallback)
+    }
+
+    fun init(
+        uri: Uri,
+        username: String? = null,
+        password: String? = null,
+        userAgent: String? = null,
+        socketTimeout: Int? = null
+    ) {
+        if (DEBUG) Log.v(TAG, "init(uri='$uri', username='$username', password='$password', userAgent='$userAgent', socketTimeout=$socketTimeout)")
+        rtspProcessor.init(
+            uri,
+            username,
+            password,
+            userAgent,
+            socketTimeout ?: RtspProcessor.DEFAULT_SOCKET_TIMEOUT
+        )
+    }
+
+    /**
+     * Start RTSP client.
+     *
+     * @param requestVideo request video track
+     * @param requestAudio request audio track
+     * @param requestApplication request application track
+     * @see https://datatracker.ietf.org/doc/html/rfc4566#section-5.14
+     */
+    fun start(requestVideo: Boolean, requestAudio: Boolean, requestApplication: Boolean = false) {
+        if (DEBUG) Log.v(TAG, "start(requestVideo=$requestVideo, requestAudio=$requestAudio, requestApplication=$requestApplication)")
+        rtspProcessor.start(requestVideo, requestAudio, requestApplication)
+    }
+
+    /**
+     * Stop RTSP client.
+     */
+    fun stop() {
+        if (DEBUG) Log.v(TAG, "stop()")
+        rtspProcessor.stop()
+    }
+
+    fun isStarted(): Boolean {
+        return rtspProcessor.isStarted()
+    }
+
+    fun setStatusListener(listener: RtspStatusListener?) {
+        if (DEBUG) Log.v(TAG, "setStatusListener()")
+        rtspProcessor.statusListener = listener
+    }
+
+    fun setDataListener(listener: RtspDataListener?) {
+        if (DEBUG) Log.v(TAG, "setDataListener()")
+        rtspProcessor.dataListener = listener
+    }
+
+    companion object {
+        private val TAG: String = RtspSurfaceView::class.java.simpleName
+        private const val DEBUG = false
+    }
+
+}
+
+@OptIn(UnstableApi::class)
+fun NalUnitUtil.SpsData.spsDataToString(): String {
+    return "" +
+        "width=${this.width}, " +
+        "height=${this.height}, " +
+        "profile_idc=${this.profileIdc}, " +
+        "constraint_set_flags=${this.constraintsFlagsAndReservedZero2Bits}, " +
+        "level_idc=${this.levelIdc}, " +
+        "max_num_ref_frames=${this.maxNumRefFrames}, " +
+        "frame_mbs_only_flag=${this.frameMbsOnlyFlag}, " +
+        "log2_max_frame_num=${this.frameNumLength}, " +
+        "pic_order_cnt_type=${this.picOrderCountType}, " +
+        "log2_max_pic_order_cnt_lsb=${this.picOrderCntLsbLength}, " +
+        "delta_pic_order_always_zero_flag=${this.deltaPicOrderAlwaysZeroFlag}, " +
+        "max_reorder_frames=${this.maxNumReorderFrames}"
+}
+
+fun ByteArray.toHexString(offset: Int, maxLength: Int): String {
+    val length = minOf(maxLength, size - offset)
+    return sliceArray(offset until (offset + length))
+        .joinToString(separator = "") { byte ->
+            "%02x ".format(byte).uppercase()
+        }
+}

rtspclientlibrary/src/main/java/com/alexvas/utils/ByteUtils.java

@@ -0,0 +1,34 @@
+package com.alexvas.utils;
+
+import androidx.annotation.NonNull;
+
+import java.io.File;
+import java.io.FileOutputStream;
+
+public class ByteUtils {
+
+    // int memcmp ( const void * ptr1, const void * ptr2, size_t num );
+    public static boolean memcmp(
+            @NonNull byte[] source1,
+            int offsetSource1,
+            @NonNull byte[] source2,
+            int offsetSource2,
+            int num) {
+        if (source1.length - offsetSource1 < num)
+            return false;
+        if (source2.length - offsetSource2 < num)
+            return false;
+
+        for (int i = 0; i < num; i++) {
+            if (source1[offsetSource1 + i] != source2[offsetSource2 + i])
+                return false;
+        }
+        return true;
+    }
+
+    public static byte[] copy(@NonNull byte[] src) {
+        byte[] dest = new byte[src.length];
+        System.arraycopy(src, 0, dest, 0, src.length);
+        return dest;
+    }
+}

rtspclientlibrary/src/main/java/com/alexvas/utils/MediaCodecUtils.kt

@@ -0,0 +1,97 @@
+package com.alexvas.utils
+
+import android.annotation.SuppressLint
+import android.util.Log
+import android.util.Range
+import androidx.annotation.OptIn
+import androidx.media3.common.util.UnstableApi
+import androidx.media3.exoplayer.mediacodec.MediaCodecInfo
+import androidx.media3.exoplayer.mediacodec.MediaCodecUtil
+import java.lang.Exception
+
+@SuppressLint("UnsafeOptInUsageError")
+object MediaCodecUtils {
+
+    // key - codecs mime type
+    // value - list of codecs able to handle this mime type
+    private val decoderInfosMap = HashMap<String, List<MediaCodecInfo>>()
+
+    private val TAG: String = MediaCodecUtils::class.java.simpleName
+
+    private fun getDecoderInfos(mimeType: String): List<MediaCodecInfo> {
+        val list = decoderInfosMap[mimeType]
+        return if (list.isNullOrEmpty()) {
+            val decoderInfos = try {
+                MediaCodecUtil.getDecoderInfos(mimeType, false, false)
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to initialize '$mimeType' decoders list (${e.message})", e)
+                ArrayList()
+            }
+            decoderInfosMap[mimeType] = decoderInfos
+            decoderInfos
+        } else {
+            list
+        }
+    }
+
+    /**
+     * Get software decoders list. Usually used as fallback.
+     */
+    @Synchronized
+    fun getSoftwareDecoders(mimeType: String): List<MediaCodecInfo> {
+        val decoderInfos = getDecoderInfos(mimeType)
+        val list = ArrayList<MediaCodecInfo>()
+        for (codec in decoderInfos) {
+            if (codec.softwareOnly)
+                list.add(codec)
+        }
+        return list
+    }
+
+    /**
+     * Get hardware accelerated decoders list. Used as default.
+     */
+    @Synchronized
+    fun getHardwareDecoders(mimeType: String): List<MediaCodecInfo> {
+        val decoderInfos = getDecoderInfos(mimeType)
+        val list = ArrayList<MediaCodecInfo>()
+        for (codec in decoderInfos) {
+            if (codec.hardwareAccelerated)
+                list.add(codec)
+        }
+        return list
+    }
+
+    /**
+     * Look through all decoders (if there are multiple)
+     * and select the one which supports low-latency.
+     */
+    @OptIn(UnstableApi::class)
+    fun getLowLatencyDecoder(decoders: List<MediaCodecInfo>): MediaCodecInfo? {
+        // Some devices can have several decoders, e.g.
+        // Samsung Fold 5:
+        //   "c2.qti.avc.decoder"
+        //   "c2.qti.avc.decoder.low_latency"
+        for (decoder in decoders) {
+            if (decoder.name.contains("low_latency"))
+                return decoder
+        }
+        // Another approach to find decoder with low-latency is to call
+        // MediaCodec.createByCodecName(name) for every decoder to get decoder instance and then call
+        // decoder.codecInfo.getCapabilitiesForType(mimeType).isFeatureSupported(MediaCodecInfo.CodecCapabilities.FEATURE_LowLatency)
+
+        // No low-latency decoder found.
+        return null
+    }
+
+}
+
+fun android.media.MediaCodecInfo.CodecCapabilities.capabilitiesToString(): String {
+    var heights = videoCapabilities?.supportedHeights
+    if (heights == null)
+        heights = Range(-1, -1)
+    var widths = videoCapabilities?.supportedWidths
+    if (widths == null)
+        widths = Range(-1, -1)
+    return "max instances: ${maxSupportedInstances}, max resolution: ${heights.upper}x${widths.upper}"
+}

rtspclientlibrary/src/main/java/com/alexvas/utils/NetUtils.java

@@ -0,0 +1,238 @@
+package com.alexvas.utils;
+
+import android.util.Log;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import java.io.EOFException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocket;
+import javax.net.ssl.TrustManager;
+import javax.net.ssl.X509TrustManager;
+
+public class NetUtils {
+
+    private static final String TAG = NetUtils.class.getSimpleName();
+    private static final boolean DEBUG = false;
+    private final static int MAX_LINE_SIZE = 4098;
+
+    public static final class FakeX509TrustManager implements X509TrustManager {
+
+        /**
+         * Accepted issuers for fake trust manager
+         */
+        final static private X509Certificate[] mAcceptedIssuers = new X509Certificate[]{};
+
+        /**
+         * Constructor for FakeX509TrustManager.
+         */
+        public FakeX509TrustManager() {
+        }
+
+        /**
+         * @see javax.net.ssl.X509TrustManager#checkClientTrusted(X509Certificate[],String authType)
+         */
+        public void checkClientTrusted(X509Certificate[] certificates, String authType)
+        throws CertificateException {
+        }
+
+        /**
+         * @see javax.net.ssl.X509TrustManager#checkServerTrusted(X509Certificate[],String authType)
+         */
+        public void checkServerTrusted(X509Certificate[] certificates, String authType)
+        throws CertificateException {
+        }
+
+        // https://github.com/square/okhttp/issues/4669
+        // Called by Android via reflection in X509TrustManagerExtensions.
+        @SuppressWarnings("unused")
+        public List<X509Certificate> checkServerTrusted(X509Certificate[] chain, String authType, String host) throws CertificateException {
+            return Arrays.asList(chain);
+        }
+
+        /**
+         * @see javax.net.ssl.X509TrustManager#getAcceptedIssuers()
+         */
+        public X509Certificate[] getAcceptedIssuers() {
+            return mAcceptedIssuers;
+        }
+    }
+
+    @NonNull
+    public static SSLSocket createSslSocketAndConnect(@NonNull String dstName, int dstPort, int timeout) throws Exception {
+        if (DEBUG)
+            Log.v(TAG, "createSslSocketAndConnect(dstName=" + dstName + ", dstPort=" + dstPort + ", timeout=" + timeout + ")");
+
+//        TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
+//        trustManagerFactory.init((KeyStore) null);
+//        TrustManager[] trustManagers = trustManagerFactory.getTrustManagers();
+//        if (trustManagers.length != 1 || !(trustManagers[0] instanceof X509TrustManager)) {
+//           throw new IllegalStateException("Unexpected default trust managers:" + Arrays.toString(trustManagers));
+//        }
+//        X509TrustManager trustManager = (X509TrustManager) trustManagers[0];
+
+        SSLContext sslContext = SSLContext.getInstance("TLS");
+        sslContext.init(null, new TrustManager[] { new FakeX509TrustManager() }, null);
+        SSLSocket sslSocket = (SSLSocket) sslContext.getSocketFactory().createSocket();
+        sslSocket.connect(new InetSocketAddress(dstName, dstPort), timeout);
+        sslSocket.setSoLinger(false, 1);
+        sslSocket.setSoTimeout(timeout);
+        return sslSocket;
+    }
+
+    @NonNull
+    public static Socket createSocketAndConnect(@NonNull String dstName, int dstPort, int timeout) throws IOException {
+        if (DEBUG)
+            Log.v(TAG, "createSocketAndConnect(dstName=" + dstName + ", dstPort=" + dstPort + ", timeout=" + timeout + ")");
+        Socket socket = new Socket();
+        socket.connect(new InetSocketAddress(dstName, dstPort), timeout);
+        socket.setSoLinger(false, 1);
+        socket.setSoTimeout(timeout);
+        return socket;
+    }
+
+    @NonNull
+    public static Socket createSocket(int timeout) throws IOException {
+        Socket socket = new Socket();
+        socket.setSoLinger(false, 1);// 1 sec for flush() before close()
+        socket.setSoTimeout(timeout);  // 10 sec timeout for read(), not for write()
+        return socket;
+    }
+
+    public static void closeSocket(@Nullable Socket socket) throws IOException {
+        if (DEBUG)
+            Log.v(TAG, "closeSocket()");
+        if (socket != null) {
+            try {
+                socket.shutdownInput();
+            } catch (Exception ignored) {
+            }
+            try {
+                socket.shutdownOutput();
+            } catch (Exception ignored) {
+            }
+            socket.close();
+        }
+    }
+
+    @NonNull
+    public static ArrayList<String> readResponseHeaders(@NonNull InputStream inputStream) throws IOException {
+//        Assert.assertNotNull("Input stream should not be null", inputStream);
+        ArrayList<String> headers = new ArrayList<>();
+        String line;
+        while (true) {
+            line = readLine(inputStream);
+            if (line != null) {
+                if (line.equals("\r\n"))
+                    return headers;
+                else
+                    headers.add(line);
+            } else {
+                break;
+            }
+        }
+        return headers;
+    }
+
+    @Nullable
+    public static String readLine(@NonNull InputStream inputStream) throws IOException {
+//        Assert.assertNotNull("Input stream should not be null", inputStream);
+        byte[] bufferLine = new byte[MAX_LINE_SIZE];
+        int offset = 0;
+        int readBytes;
+        do {
+            // Didn't find "\r\n" within 4K bytes
+            if (offset >= MAX_LINE_SIZE) {
+                throw new IOException("Invalid headers");
+            }
+
+            // Read 1 byte
+            readBytes = inputStream.read(bufferLine, offset, 1);
+            if (readBytes == 1) {
+                // Check for EOL
+                // Some cameras like Linksys WVC200 do not send \n instead of \r\n
+                if (offset > 0 && /*bufferLine[offset-1] == '\r' &&*/ bufferLine[offset] == '\n') {
+                    // Found empty EOL. End of header section
+                    if (offset == 1)
+                        break;
+
+                    // Found EOL. Add to array.
+                    return new String(bufferLine, 0, offset-1);
+                } else {
+                    offset++;
+                }
+            }
+        } while (readBytes > 0);
+        return null;
+    }
+
+    public static int getResponseStatusCode(@NonNull ArrayList<String> headers) {
+//        Assert.assertNotNull("Headers should not be null", headers);
+        // Search for HTTP status code header
+        for (String header: headers) {
+            int indexHttp = header.indexOf("HTTP/1.1 "); // 9 characters
+            if (indexHttp == -1)
+                indexHttp = header.indexOf("HTTP/1.0 ");
+            if (indexHttp >= 0) {
+                int indexCode = header.indexOf(' ', 9);
+                String code = header.substring(9, indexCode);
+                try {
+                    return Integer.parseInt(code);
+                } catch (NumberFormatException e) {
+                    // Does not fulfill standard "HTTP/1.1 200 Ok" token
+                    // Continue search for
+                }
+            }
+        }
+        // Not found
+        return -1;
+    }
+
+//    @Nullable
+//    static String readContentAsText(@Nullable InputStream inputStream) throws IOException {
+//        if (inputStream == null)
+//            return null;
+//        BufferedReader r = new BufferedReader(new InputStreamReader(inputStream));
+//        StringBuilder total = new StringBuilder();
+//        String line;
+//        while ((line = r.readLine()) != null) {
+//            total.append(line);
+//            total.append("\r\n");
+//        }
+//        return total.toString();
+//    }
+
+    @NonNull
+    public static String readContentAsText(@NonNull InputStream inputStream, int length) throws IOException {
+//        Assert.assertNotNull("Input stream should not be null", inputStream);
+        if (length <= 0)
+            return "";
+        byte[] b = new byte[length];
+        int read = readData(inputStream, b, 0, length);
+        return new String(b, 0, read);
+    }
+
+    public static int readData(@NonNull InputStream inputStream, @NonNull byte[] buffer, int offset, int length) throws IOException {
+        int readBytes;
+        int totalReadBytes = 0;
+        do {
+            readBytes = inputStream.read(buffer, offset + totalReadBytes, length - totalReadBytes);
+            if (readBytes == -1) {
+                throw new EOFException("Stream closed, read " + totalReadBytes + " of " + length + " bytes");
+            }
+            totalReadBytes += readBytes;
+        } while (readBytes >= 0 && totalReadBytes < length);
+        return totalReadBytes;
+    }
+}

rtspclientlibrary/src/main/java/com/alexvas/utils/VideoCodecUtils.kt

@@ -0,0 +1,398 @@
+package com.alexvas.utils
+
+import android.annotation.SuppressLint
+import android.util.Log
+import androidx.media3.container.NalUnitUtil
+import androidx.media3.container.NalUnitUtil.SpsData
+import java.util.concurrent.atomic.AtomicInteger
+import kotlin.experimental.and
+
+
+object VideoCodecUtils {
+
+    private val TAG = VideoCodecUtils::class.java.simpleName
+
+    /** Max possible NAL SPS size in bytes */
+    const val MAX_NAL_SPS_SIZE:     Int = 500
+
+    const val NAL_SLICE:            Byte = 1
+    const val NAL_DPA:              Byte = 2
+    const val NAL_DPB:              Byte = 3
+    const val NAL_DPC:              Byte = 4
+    const val NAL_IDR_SLICE:        Byte = 5
+    const val NAL_SEI:              Byte = 6
+    const val NAL_SPS:              Byte = 7
+    const val NAL_PPS:              Byte = 8
+    const val NAL_AUD:              Byte = 9
+    const val NAL_END_SEQUENCE:     Byte = 10
+    const val NAL_END_STREAM:       Byte = 11
+    const val NAL_FILLER_DATA:      Byte = 12
+    const val NAL_SPS_EXT:          Byte = 13
+    const val NAL_AUXILIARY_SLICE:  Byte = 19
+    const val NAL_STAP_A:           Byte = 24 // https://tools.ietf.org/html/rfc3984 5.7.1
+    const val NAL_STAP_B:           Byte = 25 // 5.7.1
+    const val NAL_MTAP16:           Byte = 26 // 5.7.2
+    const val NAL_MTAP24:           Byte = 27 // 5.7.2
+    const val NAL_FU_A:             Byte = 28 // 5.8 fragmented unit
+    const val NAL_FU_B:             Byte = 29 // 5.8
+
+    // Table 7-3: NAL unit type codes
+    const val H265_NAL_TRAIL_N:     Byte = 0
+    const val H265_NAL_TRAIL_R:     Byte = 1
+    const val H265_NAL_TSA_N:       Byte = 2
+    const val H265_NAL_TSA_R:       Byte = 3
+    const val H265_NAL_STSA_N:      Byte = 4
+    const val H265_NAL_STSA_R:      Byte = 5
+    const val H265_NAL_RADL_N:      Byte = 6
+    const val H265_NAL_RADL_R:      Byte = 7
+    const val H265_NAL_RASL_N:      Byte = 8
+    const val H265_NAL_RASL_R:      Byte = 9
+    const val H265_NAL_BLA_W_LP:    Byte = 16
+    const val H265_NAL_BLA_W_RADL:  Byte = 17
+    const val H265_NAL_BLA_N_LP:    Byte = 18
+    const val H265_NAL_IDR_W_RADL:  Byte = 19
+    const val H265_NAL_IDR_N_LP:    Byte = 20
+    const val H265_NAL_CRA_NUT:     Byte = 21
+    const val H265_NAL_VPS:         Byte = 32
+    const val H265_NAL_SPS:         Byte = 33
+    const val H265_NAL_PPS:         Byte = 34
+    const val H265_NAL_AUD:         Byte = 35
+    const val H265_NAL_EOS_NUT:     Byte = 36
+    const val H265_NAL_EOB_NUT:     Byte = 37
+    const val H265_NAL_FD_NUT:      Byte = 38
+    const val H265_NAL_SEI_PREFIX:  Byte = 39
+    const val H265_NAL_SEI_SUFFIX:  Byte = 40
+
+    private val NAL_PREFIX1 = byteArrayOf(0x00, 0x00, 0x00, 0x01)
+    private val NAL_PREFIX2 = byteArrayOf(0x00, 0x00, 0x01)
+
+
+    /**
+     * Search for 00 00 01 or 00 00 00 01 in byte stream.
+     * @return offset to the start of NAL unit if found, otherwise -1
+     */
+    fun searchForNalUnitStart(
+        data: ByteArray,
+        offset: Int,
+        length: Int,
+        prefixSize: AtomicInteger
+    ): Int {
+        if (offset >= data.size - 3) return -1
+        for (pos in 0 until length) {
+            val prefix: Int = getNalUnitStartCodePrefixSize(data, pos + offset, length)
+            if (prefix >= 0) {
+                prefixSize.set(prefix)
+                return pos + offset
+            }
+        }
+        return -1
+    }
+
+    fun searchForH264NalUnitByType(
+        data: ByteArray,
+        offset: Int,
+        length: Int,
+        byUnitType: Int
+    ): Int {
+        var off = offset
+        val nalUnitPrefixSize = AtomicInteger(-1)
+        val timestamp = System.currentTimeMillis()
+        while (true) {
+            val nalUnitIndex = searchForNalUnitStart(data, off, length, nalUnitPrefixSize)
+            if (nalUnitIndex >= 0) {
+                val nalUnitOffset = nalUnitIndex + nalUnitPrefixSize.get()
+                if (nalUnitOffset >= data.size)
+                    break
+                val nalUnitTypeOctet = data[nalUnitOffset]
+                if ((nalUnitTypeOctet and 0x1f).toInt() == byUnitType) {
+                    return nalUnitIndex
+                }
+                off = nalUnitOffset
+
+                // Check that we are not too long here
+                if (System.currentTimeMillis() - timestamp > 100) {
+                    Log.w(TAG, "Cannot process data within 100 msec in $length bytes")
+                    break
+                }
+            } else {
+                break
+            }
+        }
+        return -1
+    }
+
+    fun getNalUnitType(data: ByteArray?, offset: Int, length: Int, isH265: Boolean): Byte {
+        if (data == null || length <= NAL_PREFIX1.size) return (-1).toByte()
+        var nalUnitTypeOctetOffset = -1
+        if (data[offset + NAL_PREFIX2.size - 1] == 1.toByte())
+            nalUnitTypeOctetOffset =
+                offset + NAL_PREFIX2.size - 1
+        else if (data[offset + NAL_PREFIX1.size - 1] == 1.toByte())
+            nalUnitTypeOctetOffset = offset + NAL_PREFIX1.size - 1
+
+        return if (nalUnitTypeOctetOffset != -1) {
+            val nalUnitTypeOctet = data[nalUnitTypeOctetOffset + 1]
+            if (isH265)
+                ((nalUnitTypeOctet.toInt() shr 1) and 0x3F).toByte()
+            else
+                (nalUnitTypeOctet and 0x1f)
+        } else {
+            (-1).toByte()
+        }
+    }
+
+    private fun getNalUnitStartCodePrefixSize(
+        data: ByteArray,
+        offset: Int,
+        length: Int
+    ): Int {
+        if (length < 4) return -1
+        return if (memcmp(data, offset, NAL_PREFIX1, 0, NAL_PREFIX1.size))
+            NAL_PREFIX1.size else
+            if (memcmp(data, offset, NAL_PREFIX2, 0, NAL_PREFIX2.size))
+                NAL_PREFIX2.size else
+                -1
+    }
+
+    private fun memcmp(
+        source1: ByteArray,
+        offsetSource1: Int,
+        source2: ByteArray,
+        offsetSource2: Int,
+        num: Int
+    ): Boolean {
+        if (source1.size - offsetSource1 < num) return false
+        if (source2.size - offsetSource2 < num) return false
+        for (i in 0 until num) {
+            if (source1[offsetSource1 + i] != source2[offsetSource2 + i]) return false
+        }
+        return true
+    }
+
+    data class NalUnit (val type: Byte, val offset: Int, val length: Int)
+
+
+    fun getNalUnits(
+        data: ByteArray,
+        dataOffset: Int,
+        length: Int,
+        foundNals: ArrayList<NalUnit>,
+        isH265: Boolean
+    ): Int {
+        foundNals.clear()
+        var nalUnits = 0
+        val nextNalOffset = 0
+        val nalUnitPrefixSize = AtomicInteger(-1)
+        val timestamp = System.currentTimeMillis()
+        var offset = dataOffset
+        var stopped = false
+        while (!stopped) {
+
+            // Search for first NAL unit
+            val nalUnitIndex = searchForNalUnitStart(
+                data,
+                offset + nextNalOffset,
+                length - nextNalOffset,
+                nalUnitPrefixSize
+            )
+
+            // NAL unit found
+            if (nalUnitIndex >= 0) {
+                nalUnits++
+                val nalUnitOffset = offset + nextNalOffset + nalUnitPrefixSize.get()
+                val nalUnitTypeOctet = data[nalUnitOffset]
+                val nalUnitType = if (isH265)
+                    ((nalUnitTypeOctet.toInt() shr 1) and 0x3F).toByte()
+                else
+                    (nalUnitTypeOctet and 0x1F)
+
+                // Search for second NAL unit (optional)
+                var nextNalUnitStartIndex = searchForNalUnitStart(
+                    data,
+                    nalUnitOffset,
+                    length - nalUnitOffset,
+                    nalUnitPrefixSize
+                )
+
+                // Second NAL unit not found. Use till the end.
+                if (nextNalUnitStartIndex < 0) {
+                    // Not found next NAL unit. Use till the end.
+//                  nextNalUnitStartIndex = length - nextNalOffset + dataOffset;
+                    nextNalUnitStartIndex = length + dataOffset
+                    stopped = true
+                }
+                val l = nextNalUnitStartIndex - offset
+//                if (DEBUG) Log.d(
+//                    TAG,
+//                    "NAL unit type: " + getH264NalUnitTypeString(nalUnitType.toInt()) +
+//                            " (" + nalUnitType + ") - " + l + " bytes, offset " + offset
+//                )
+                foundNals.add(NalUnit(nalUnitType, offset, l))
+                offset = nextNalUnitStartIndex
+
+                // Check that we are not too long here
+                if (System.currentTimeMillis() - timestamp > 200) {
+                    Log.w(TAG, "Cannot process data within 200 msec in $length bytes (NALs found: " + foundNals.size + ")")
+                    break
+                }
+            } else {
+                stopped = true
+            }
+        }
+        return nalUnits
+    }
+
+    private fun getNalUnitStartLengthFromArray(
+        src: ByteArray, offset: Int, length: Int,
+        isH265: Boolean,
+        nalUnitType: Byte
+    ): Pair<Int, Int>? {
+        val nalUnitsFound = ArrayList<NalUnit>()
+        if (getNalUnits(src, offset, length, nalUnitsFound, isH265) > 0) {
+            for (nalUnit in nalUnitsFound) {
+                if (nalUnit.type == nalUnitType) {
+                    val prefixSize = AtomicInteger()
+                    val nalUnitIndex = searchForNalUnitStart(
+                        src,
+                        nalUnit.offset,
+                        nalUnit.length,
+                        prefixSize
+                    )
+                    val nalOffset = nalUnitIndex + prefixSize.get() + 1 /* NAL unit type */
+                    return Pair(nalOffset, nalUnit.length)
+                }
+            }
+        }
+        return null
+    }
+
+    @SuppressLint("UnsafeOptInUsageError")
+    fun getSpsNalUnitFromArray(src: ByteArray, offset: Int, length: Int, isH265: Boolean): SpsData? {
+        val spsStartLength = getNalUnitStartLengthFromArray(src, offset, length, isH265, NAL_SPS)
+        spsStartLength?.let {
+            return NalUnitUtil.parseSpsNalUnitPayload(
+                src, spsStartLength.first, spsStartLength.first + spsStartLength.second)
+        }
+        return null
+    }
+
+    @SuppressLint("UnsafeOptInUsageError")
+    fun getWidthHeightFromArray(src: ByteArray, offset: Int, length: Int, isH265: Boolean): Pair<Int, Int>? {
+        val sps = getSpsNalUnitFromArray(src, offset, length, isH265)
+        sps?.let {
+            return Pair(sps.width, sps.height)
+        }
+        return null
+    }
+
+
+//    private fun isH265IRAP(nalUnitType: Byte): Boolean {
+//        return nalUnitType in 16..23
+//    }
+
+    fun isAnyKeyFrame(data: ByteArray?, offset: Int, length: Int, isH265: Boolean): Boolean {
+        if (data == null || length <= 0) return false
+        var currOffset = offset
+
+        val nalUnitPrefixSize = AtomicInteger(-1)
+        val timestamp = System.currentTimeMillis()
+        while (true) {
+            val nalUnitIndex = searchForNalUnitStart(
+                data,
+                currOffset,
+                length,
+                nalUnitPrefixSize
+            )
+
+            if (nalUnitIndex >= 0) {
+                val nalUnitOffset = nalUnitIndex + nalUnitPrefixSize.get()
+                if (nalUnitOffset >= data.size)
+                    return false
+                val nalUnitTypeOctet = data[nalUnitOffset]
+
+                if (isH265) {
+                    val nalUnitType = ((nalUnitTypeOctet.toInt() and 0x7E) shr 1).toByte()
+                    // Treat SEI_PREFIX as key frame.
+                    if (nalUnitType == H265_NAL_IDR_W_RADL || nalUnitType == H265_NAL_IDR_N_LP)
+                        return true
+                } else {
+                    val nalUnitType = (nalUnitTypeOctet.toInt() and 0x1f).toByte()
+                    when (nalUnitType) {
+                        NAL_IDR_SLICE -> return true
+                        NAL_SLICE -> return false
+                    }
+                }
+                // Continue searching
+                currOffset = nalUnitOffset
+
+                // Check that we are not too long here
+                if (System.currentTimeMillis() - timestamp > 100) {
+                    Log.w(TAG, "Cannot process data within 100 msec in $length bytes (index=$nalUnitIndex)")
+                    break
+                }
+            } else {
+                break
+            }
+        }
+
+        return false
+    }
+
+    fun getH264NalUnitTypeString(nalUnitType: Byte): String {
+        return when (nalUnitType) {
+            NAL_SLICE -> "NAL_SLICE"
+            NAL_DPA -> "NAL_DPA"
+            NAL_DPB -> "NAL_DPB"
+            NAL_DPC -> "NAL_DPC"
+            NAL_IDR_SLICE -> "NAL_IDR_SLICE"
+            NAL_SEI -> "NAL_SEI"
+            NAL_SPS -> "NAL_SPS"
+            NAL_PPS -> "NAL_PPS"
+            NAL_AUD -> "NAL_AUD"
+            NAL_END_SEQUENCE -> "NAL_END_SEQUENCE"
+            NAL_END_STREAM -> "NAL_END_STREAM"
+            NAL_FILLER_DATA -> "NAL_FILLER_DATA"
+            NAL_SPS_EXT -> "NAL_SPS_EXT"
+            NAL_AUXILIARY_SLICE -> "NAL_AUXILIARY_SLICE"
+            NAL_STAP_A -> "NAL_STAP_A"
+            NAL_STAP_B -> "NAL_STAP_B"
+            NAL_MTAP16 -> "NAL_MTAP16"
+            NAL_MTAP24 -> "NAL_MTAP24"
+            NAL_FU_A -> "NAL_FU_A"
+            NAL_FU_B -> "NAL_FU_B"
+            else -> "unknown - $nalUnitType"
+        }
+    }
+
+    fun getH265NalUnitTypeString(nalUnitType: Byte): String {
+        return when (nalUnitType) {
+            H265_NAL_TRAIL_N -> "NAL_TRAIL_N"
+            H265_NAL_TRAIL_R -> "NAL_TRAIL_R"
+            H265_NAL_TSA_N -> "NAL_TSA_N"
+            H265_NAL_TSA_R -> "NAL_TSA_R"
+            H265_NAL_STSA_N -> "NAL_STSA_N"
+            H265_NAL_STSA_R -> "NAL_STSA_R"
+            H265_NAL_RADL_N -> "NAL_RADL_N"
+            H265_NAL_RADL_R -> "NAL_RADL_R"
+            H265_NAL_RASL_N -> "NAL_RASL_N"
+            H265_NAL_RASL_R -> "NAL_RASL_R"
+            H265_NAL_BLA_W_LP -> "NAL_BLA_W_LP"
+            H265_NAL_BLA_W_RADL -> "NAL_BLA_W_RADL"
+            H265_NAL_BLA_N_LP -> "NAL_BLA_N_LP"
+            H265_NAL_IDR_W_RADL -> "NAL_IDR_W_RADL"
+            H265_NAL_IDR_N_LP -> "NAL_IDR_N_LP"
+            H265_NAL_CRA_NUT -> "NAL_CRA_NUT"
+            H265_NAL_VPS -> "NAL_VPS"
+            H265_NAL_SPS -> "NAL_SPS"
+            H265_NAL_PPS -> "NAL_PPS"
+            H265_NAL_AUD -> "NAL_AUD"
+            H265_NAL_EOS_NUT -> "NAL_EOS_NUT"
+            H265_NAL_EOB_NUT -> "NAL_EOB_NUT"
+            H265_NAL_FD_NUT -> "NAL_FD_NUT"
+            H265_NAL_SEI_PREFIX -> "NAL_SEI_PREFIX"
+            H265_NAL_SEI_SUFFIX -> "NAL_SEI_SUFFIX"
+            else -> "unknown - $nalUnitType"
+        }
+    }
+
+}

settings.gradle.kts

@@ -25,4 +25,5 @@ dependencyResolutionManagement {
 rootProject.name = "m20_gamepad"
 include(":app")
 include(":joysticklibrary")
+include(":rtspclientlibrary")