如何实现Android端获取RTSP|RTMP流转推RTMP

技术背景

最近不少开发者找到我们，他们在做智能家居等传统行业时，希望实现在Android板件拉取本地的RTSP或RTMP流，然后对外推送RTMP出去，亦或内部启个轻量级RTSP服务，提供个对外对接的媒介URL，简单来说，设计架构图如下：

基于上诉诉求，我们以大牛直播SDK （官方）Android端的 SmartRelayDemoV2 工程为例，大概介绍下相关实现。

整体设计

1. 拉流：通过RTSP|RTMP直播播放SDK的数据回调接口，拿到音视频数据；

2. 转推：通过RTMP直播推送SDK的编码后数据输入接口，把回调上来的数据，传给RTMP直播推送模块，实现RTSP|RTMP数据流到RTMP服务器的转发；

3. 录像：如果需要录像，借助RTSP|RTMP直播播放SDK，拉到音视频数据后，直接存储MP4文件即可；

4. 快照：如果需要实时快照，拉流后，解码调用播放端快照接口，生成快照，因为快照涉及到video数据解码，如无必要，可不必开启，不然会额外消耗性能。

5. 拉流预览：如需预览拉流数据，只要调用播放端的播放接口，即可实现拉流数据预览；

6. 数据转AAC后转发：考虑到好多监控设备出来的音频可能是PCMA/PCMU的，如需要更通用的音频格式，可以转AAC后，在通过RTMP推送；

7. 转推RTMP实时静音：只需要在传audio数据的地方，加个判断即可；

8. 拉流速度反馈：通过RTSP播放端的实时码率反馈event，拿到实时带宽占用即可；

9. 整体网络状态反馈：考虑到有些摄像头可能会临时或异常关闭，RTMP服务器亦是，可以通过推拉流的event回调状态，查看那整体网络情况，如此界定：是拉不到流，还是推不到RTMP服务器；

10. 数据注入轻量级RTSP服务：拉流的数据，注入轻量级RTSP服务，对外提供RTSP URL。

先上图

Demo主要实现了以下几个功能点展示：

1. 设置RTMP、RTSP拉流的URL；

2. 设置转推RTMP的URL；

3. 实时播放|录像过程中，实时静音、实施快照；

4. 实时播放；

5. 实时录像；

6. 拉取的流数据，实时转推，对应“开始推流”；

7. 拉取的流数据，注入轻量级RTSP服务，启动服务后，发布RTSP流，对外提供可访问的RTSP URL。

注意：以上播放、录像、转推RTMP、注入轻量级RTSP服务四者是可单独工作，也可随时启动或停止相关功能，互不影响。

相关代码实现

开始拉流

拉流的目的，主要是启动数据回调，注意：拉流并不是直接播放出来窗口，只是拿数据，如果需要本地预览拉流数据，可以点击“开始播放”。

注意：“开始推流”和“发布RTSP流”之前，一定要先“开始拉流”，拿到音视频数据。

 private boolean StartPull(){if ( isPulling )return false;if (!OpenPullHandle())return false;libPlayer.SmartPlayerSetAudioDataCallback(playerHandle, new PlayerAudioDataCallback());libPlayer.SmartPlayerSetVideoDataCallback(playerHandle, new PlayerVideoDataCallback());int is_pull_trans_code  = 1;libPlayer.SmartPlayerSetPullStreamAudioTranscodeAAC(playerHandle, is_pull_trans_code);int startRet = libPlayer.SmartPlayerStartPullStream(playerHandle);if (startRet != 0) {Log.e(TAG, "Failed to start pull stream!");if(!isPlaying && !isRecording && isPushing && !isRTSPPublisherRunning){libPlayer.SmartPlayerClose(playerHandle);playerHandle = 0;}return false;}isPulling = true;return true;}

这里调到OpenPullHandle()封装，其实就是启动调研Player的Open()接口，获取到player handle，然后设置一下基础数据接口，比如event callback，buffer time，TCP/UDP模式、拉流的URL等；

 private boolean OpenPullHandle(){if (playerHandle != 0) {return true;}playbackUrl = "rtsp://admin:daniulive12345@192.168.0.120:554/h265/ch1/main/av_stream";if (playbackUrl == null) {Log.e(TAG, "playback URL with NULL...");return false;}playerHandle = libPlayer.SmartPlayerOpen(myContext);if (playerHandle == 0) {Log.e(TAG, "playerHandle is nil..");return false;}libPlayer.SetSmartPlayerEventCallbackV2(playerHandle,new EventHandePlayerV2());libPlayer.SmartPlayerSetBuffer(playerHandle, playBuffer);// set report download speed// libPlayer.SmartPlayerSetReportDownloadSpeed(playerHandle, 1, 5);//设置RTSP超时时间int rtsp_timeout = 12;libPlayer.SmartPlayerSetRTSPTimeout(playerHandle, rtsp_timeout);//设置RTSP TCP/UDP模式自动切换int is_auto_switch_tcp_udp = 1;libPlayer.SmartPlayerSetRTSPAutoSwitchTcpUdp(playerHandle, is_auto_switch_tcp_udp);libPlayer.SmartPlayerSaveImageFlag(playerHandle, 1);// It only used when playback RTSP stream..//libPlayer.SmartPlayerSetRTSPTcpMode(playerHandle, 1);libPlayer.SmartPlayerSetUrl(playerHandle, playbackUrl);return true;}

停止拉流

 private void StopPull(){if ( !isPulling )return;libPlayer.SmartPlayerStopPullStream(playerHandle);if ( !isPlaying && !isRecording && !isPushing && !isRTSPPublisherRunning){libPlayer.SmartPlayerClose(playerHandle);playerHandle = 0;}isPulling = false;}

开始播放

 private boolean StartPlay(){if (!OpenPullHandle())return false;// 如果第二个参数设置为null，则播放纯音频libPlayer.SmartPlayerSetSurface(playerHandle, sSurfaceView);libPlayer.SmartPlayerSetRenderScaleMode(playerHandle, 1);// External Render test// libPlayer.SmartPlayerSetExternalRender(playerHandle, new// RGBAExternalRender());// libPlayer.SmartPlayerSetExternalRender(playerHandle, new// I420ExternalRender());libPlayer.SmartPlayerSetFastStartup(playerHandle, isFastStartup ? 1 : 0);libPlayer.SmartPlayerSetAudioOutputType(playerHandle, 1);if (isMute) {libPlayer.SmartPlayerSetMute(playerHandle, isMute ? 1: 0);}if (isHardwareDecoder){int isSupportHevcHwDecoder = libPlayer.SetSmartPlayerVideoHevcHWDecoder(playerHandle, 1);int isSupportH264HwDecoder = libPlayer.SetSmartPlayerVideoHWDecoder(playerHandle, 1);Log.i(TAG, "isSupportH264HwDecoder: " + isSupportH264HwDecoder + ", isSupportHevcHwDecoder: " + isSupportHevcHwDecoder);}libPlayer.SmartPlayerSetLowLatencyMode(playerHandle, isLowLatency ? 1: 0);libPlayer.SmartPlayerSetRotation(playerHandle, rotate_degrees);int iPlaybackRet = libPlayer.SmartPlayerStartPlay(playerHandle);if (iPlaybackRet != 0) {Log.e(TAG, "StartPlay failed!");if ( !isPulling && !isRecording && !isPushing && !isRTSPPublisherRunning){libPlayer.SmartPlayerClose(playerHandle);playerHandle = 0;}return false;}isPlaying = true;return true;}

停止播放

 private void StopPlay(){if ( !isPlaying )return;isPlaying = false;libPlayer.SmartPlayerStopPlay(playerHandle);if ( !isPulling && !isRecording && !isPushing && !isRTSPPublisherRunning){libPlayer.SmartPlayerClose(playerHandle);playerHandle = 0;}}

开始录像

 private boolean StartRecorder(){if (!OpenPullHandle())return false;ConfigRecorderFuntion();int iRecRet = libPlayer.SmartPlayerStartRecorder(playerHandle);if (iRecRet != 0) {Log.e(TAG, "StartRecorder failed!");if ( !isPulling &&!isPlaying && !isPushing && !isRTSPPublisherRunning){libPlayer.SmartPlayerClose(playerHandle);playerHandle = 0;}return false;}isRecording = true;return true;}

停止录像

 private void StopRecorder(){if ( !isRecording )return;isRecording = false;libPlayer.SmartPlayerStopRecorder(playerHandle);if ( !isPlaying && !isPulling && !isPushing && !isRTSPPublisherRunning){libPlayer.SmartPlayerClose(playerHandle);playerHandle = 0;}}

开始推流

 private boolean StartPush(){if (isPushing)return false;relayStreamUrl = "rtmp://192.168.0.211:1935/hls/stream1";if (relayStreamUrl == null) {Log.e(TAG, "StartPush URL is null...");return false;}if (!OpenPushHandle())return false;if ( libPublisher.SmartPublisherSetURL(publisherHandle, relayStreamUrl) != 0 ){Log.e(TAG, "StartPush failed!");}int startRet = libPublisher.SmartPublisherStartPublisher(publisherHandle);if( startRet != 0){Log.e(TAG, "Failed to call StartPublisher!");if(isRTSPPublisherRunning){libPublisher.SmartPublisherClose(publisherHandle);publisherHandle = 0;}return false;}isPushing = true;return true;}

开始推流调到了OpenPushHandle()封装，具体代码如下：

 private boolean OpenPushHandle(){if(publisherHandle != 0){return true;}int audio_opt = 2;int video_opt = 2;int videoWidth = 640;int videoHeight  = 480;publisherHandle = libPublisher.SmartPublisherOpen(myContext, audio_opt, video_opt,videoWidth, videoHeight);if (publisherHandle == 0 ){Log.e(TAG, "OpenPushHandle failed!");return false;}Log.i(TAG, "publisherHandle=" + publisherHandle);libPublisher.SetSmartPublisherEventCallbackV2(publisherHandle, new EventHandePublisherV2());return true;}

停止推流

 public void StopPush(){if (!isPushing)return;isPushing = false;libPublisher.SmartPublisherStopPublisher(publisherHandle);if(!isRTSPPublisherRunning && !isRTSPServiceRunning){libPublisher.SmartPublisherClose(publisherHandle);publisherHandle = 0;}}

启动RTSP服务

 //启动/停止RTSP服务class ButtonRtspServiceListener implements OnClickListener {public void onClick(View v) {if (isRTSPServiceRunning) {stopRtspService();btnRtspService.setText("启动RTSP服务");btnRtspPublisher.setEnabled(false);isRTSPServiceRunning = false;return;}if(!OpenPushHandle()){return;}Log.i(TAG, "onClick start rtsp service..");rtsp_handle_ = libPublisher.OpenRtspServer(0);if (rtsp_handle_ == 0) {Log.e(TAG, "创建rtsp server实例失败! 请检查SDK有效性");} else {int port = 8554;if (libPublisher.SetRtspServerPort(rtsp_handle_, port) != 0) {libPublisher.CloseRtspServer(rtsp_handle_);rtsp_handle_ = 0;Log.e(TAG, "创建rtsp server端口失败! 请检查端口是否重复或者端口不在范围内!");}//String user_name = "admin";//String password = "12345";//libPublisher.SetRtspServerUserNamePassword(rtsp_handle_, user_name, password);//一般来说单播网络设备支持的好，wifi组播很多路由器不支持，默认单播模式；如需使用组播模式，确保设备支持后，打开注释代码测试即可/*boolean is_enable_multicast = true;if(is_enable_multicast){int is_multicast = 1;libPublisher.SetRtspServerMulticast(rtsp_handle_, is_multicast);boolean is_enable_ssm_multicast = true;String multicast_address = "";if(is_enable_ssm_multicast){multicast_address = MakeSSMMulticastAddress();}else{multicast_address = MakeMulticastAddress();}Log.i(TAG, "is_enable_ssm_multicast:" + is_enable_ssm_multicast + " multiAddr: " + multicast_address);libPublisher.SetRtspServerMulticastAddress(rtsp_handle_, multicast_address);}*/if (libPublisher.StartRtspServer(rtsp_handle_, 0) == 0) {Log.i(TAG, "启动rtsp server 成功!");} else {libPublisher.CloseRtspServer(rtsp_handle_);rtsp_handle_ = 0;Log.e(TAG, "启动rtsp server失败! 请检查设置的端口是否被占用!");}btnRtspService.setText("停止RTSP服务");btnRtspPublisher.setEnabled(true);isRTSPServiceRunning = true;}}}

停止RTSP服务

 //停止RTSP服务private void stopRtspService() {if(!isRTSPServiceRunning)return;if (libPublisher != null && rtsp_handle_ != 0) {libPublisher.StopRtspServer(rtsp_handle_);libPublisher.CloseRtspServer(rtsp_handle_);rtsp_handle_ = 0;}if(!isPushing){libPublisher.SmartPublisherClose(publisherHandle);publisherHandle = 0;}isRTSPServiceRunning = false;}

开始发布RTSP流

 private boolean StartRtspStream(){if (isRTSPPublisherRunning)return false;String rtsp_stream_name = "stream1";libPublisher.SetRtspStreamName(publisherHandle, rtsp_stream_name);libPublisher.ClearRtspStreamServer(publisherHandle);libPublisher.AddRtspStreamServer(publisherHandle, rtsp_handle_, 0);if (libPublisher.StartRtspStream(publisherHandle, 0) != 0){Log.e(TAG, "调用发布rtsp流接口失败!");if (!isPushing){libPublisher.SmartPublisherClose(publisherHandle);publisherHandle = 0;}return false;}isRTSPPublisherRunning = true;return true;}

停止发布RTSP流

 //停止发布RTSP流private void stopRtspPublisher(){if(!isRTSPPublisherRunning)return;if (libPublisher != null) {libPublisher.StopRtspStream(publisherHandle);}if (!isPushing && !isRTSPServiceRunning){libPublisher.SmartPublisherClose(publisherHandle);publisherHandle = 0;}isRTSPPublisherRunning = false;}

获取RTSP连接会话数

 //当前RTSP会话数弹出框private void PopRtspSessionNumberDialog(int session_numbers) {final EditText inputUrlTxt = new EditText(this);inputUrlTxt.setFocusable(true);inputUrlTxt.setEnabled(false);String session_numbers_tag = "RTSP服务当前客户会话数: " + session_numbers;inputUrlTxt.setText(session_numbers_tag);AlertDialog.Builder builderUrl = new AlertDialog.Builder(this);builderUrl.setTitle("内置RTSP服务").setView(inputUrlTxt).setNegativeButton("确定", null);builderUrl.show();}//获取RTSP会话数class ButtonGetRtspSessionNumbersListener implements OnClickListener {public void onClick(View v) {if (libPublisher != null && rtsp_handle_ != 0) {int session_numbers = libPublisher.GetRtspServerClientSessionNumbers(rtsp_handle_);Log.i(TAG, "GetRtspSessionNumbers: " + session_numbers);PopRtspSessionNumberDialog(session_numbers);}}};

总结

以上是大概的流程，感兴趣的开发者可自行参考。