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。
代码语言：javascript复制 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；
代码语言：javascript复制 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
代码语言：javascript复制 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
代码语言：javascript复制 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
代码语言：javascript复制 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
代码语言：javascript复制 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
代码语言：javascript复制 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
代码语言：javascript复制 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：
代码语言：javascript复制 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
代码语言：javascript复制 public void StopPush()
{
if (!isPushing)
return;
isPushing = false;
libPublisher.SmartPublisherStopPublisher(publisherHandle);
if(!isRTSPPublisherRunning && !isRTSPServiceRunning)
{
libPublisher.SmartPublisherClose(publisherHandle);
publisherHandle = 0;
}
}启动RTSP服务
代码语言：javascript复制 //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
代码语言：javascript复制 //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
代码语言：javascript复制 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
代码语言：javascript复制 //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
代码语言：javascript复制 //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。
