技术背景
我们在做内网环境的一对一音视频互动的时候，遇到这样的技术诉求：如智能硬件场景下（比如操控智能硬件），纯内网环境，如何不要单独部署RTMP或类似流媒体服务，实现一对一音视频互动。
目前大多数场景，是走RTMP或WebRTC，无一例外的需要部署流媒体服务，如果纯内网环境下，实际上是考虑，两个终端同时开启轻量级RTSP服务，然后相互拉取对方回调上来的RTSP URL，通过回音消除等，实现智能化场景的一对一音视频互动。
技术实现
为此，我们在大牛直播SDK之前一对一互动demo基础上，添加了轻量级RTSP服务模块，上面系播放端，下面是轻量级RTSP服务。如果需要一对一互动，只要先点击启动RTSP服务，然后再发布RTSP流即可回调上来可以拉流的RTSP URL，回上来的URL，可以通过其他技术逻辑，通知给对方终端。
双方获取到对方的RTSP URL后，开始播放即可。
对应的代码如下：
//Author: daniusdk.com
//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;
}
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);
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;
}
}
}发布RTSP流：
//发布/停止RTSP流
class ButtonRtspPublisherListener implements OnClickListener {
public void onClick(View v) {
if (isRTSPPublisherRunning) {
stopRtspPublisher();
if (!isPushingRtmp) {
ConfigControlEnable(true);
}
btnRtspPublisher.setText("发布RTSP流");
btnGetRtspSessionNumbers.setEnabled(false);
btnRtspService.setEnabled(true);
isRTSPPublisherRunning = false;
return;
}
Log.i(TAG, "onClick start rtsp publisher..");
if (!isPushingRtmp) {
InitPusherAndSetConfig();
}
if (publisherHandle == 0) {
Log.e(TAG, "Start rtsp publisher, publisherHandle is null..");
return;
}
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!");
return;
}
if (!isPushingRtmp) {
if (pushType == 0 || pushType == 1) {
CheckInitAudioRecorder(); //enable pure video publisher..
}
ConfigControlEnable(false);
}
startLayerPostThread();
btnRtspPublisher.setText("停止RTSP流");
btnGetRtspSessionNumbers.setEnabled(true);
btnRtspService.setEnabled(false);
isRTSPPublisherRunning = true;
}
}获取RTSP流会话链接数：
//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);
}
}
}相关Event状态回调设计如下：
class EventHandlePublisherV2 implements NTSmartEventCallbackV2 {
@Override
public void onNTSmartEventCallbackV2(long handle, int id, long param1, long param2, String param3, String param4, Object param5) {
Log.i(TAG, "EventHandlePublisherV2: handle=" + handle + " id:" + id);
String publisher_event = "";
switch (id) {
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_STARTED:
publisher_event = "开始..";
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTING:
publisher_event = "连接中..";
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTION_FAILED:
publisher_event = "连接失败..";
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CONNECTED:
publisher_event = "连接成功..";
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_DISCONNECTED:
publisher_event = "连接断开..";
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_STOP:
publisher_event = "关闭..";
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RECORDER_START_NEW_FILE:
publisher_event = "开始一个新的录像文件 : " + param3;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_ONE_RECORDER_FILE_FINISHED:
publisher_event = "已生成一个录像文件 : " + param3;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_SEND_DELAY:
publisher_event = "发送时延: " + param1 + " 帧数:" + param2;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CAPTURE_IMAGE:
publisher_event = "快照: " + param1 + " 路径：" + param3;
if (param1 == 0) {
publisher_event = publisher_event + "截取快照成功..";
} else {
publisher_event = publisher_event + "截取快照失败..";
}
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RTSP_URL:
publisher_event = "RTSP服务URL: " + param3;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUSH_RTSP_SERVER_RESPONSE_STATUS_CODE:
publisher_event = "RTSP status code received, codeID: " + param1 + ", RTSP URL: " + param3;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUSH_RTSP_SERVER_NOT_SUPPORT:
publisher_event = "服务器不支持RTSP推送, 推送的RTSP URL: " + param3;
break;
}
String str = "当前回调状态：" + publisher_event;
Log.i(TAG, str);
Message message = new Message();
message.what = PUBLISHER_EVENT_MSG;
message.obj = publisher_event;
handler_.sendMessage(message);
}
}如果需要播放对方的RTSP URL：
btnPlaybackStartStopPlayback.setOnClickListener(new Button.OnClickListener() {
// @Override
public void onClick(View v) {
if (isPlaybackViewStarted) {
Log.i(PLAY_TAG, "Stop playback stream++");
btnPlaybackStartStopPlayback.setText("开始播放 ");
//btnPopInputText.setEnabled(true);
btnPlaybackPopInputUrl.setEnabled(true);
btnPlaybackHardwareDecoder.setEnabled(true);
btnPlaybackSetPlayBuffer.setEnabled(true);
btnPlaybackFastStartup.setEnabled(true);
if (playerHandle != 0) {
libPlayer.SmartPlayerStopPlay(playerHandle);
}
releasePlayerHandle();
isPlaybackViewStarted = false;
Log.i(PLAY_TAG, "Stop playback stream--");
} else {
Log.i(PLAY_TAG, "Start playback stream++");
playerHandle = libPlayer.SmartPlayerOpen(curContext);
if (playerHandle == 0) {
Log.e(PLAY_TAG, "surfaceHandle with nil..");
return;
}
libPlayer.SetSmartPlayerEventCallbackV2(playerHandle,
new EventHandlePlayerV2());
libPlayer.SmartPlayerSetSurface(playerHandle, playerSurfaceView); //if set the second param with null, it means it will playback audio only..
// libPlayer.SmartPlayerSetSurface(playerHandle, null);
libPlayer.SmartPlayerSetRenderScaleMode(playerHandle, 1);
// External Render test
//libPlayer.SmartPlayerSetExternalRender(playerHandle, new RGBAExternalRender());
//libPlayer.SmartPlayerSetExternalRender(playerHandle, new I420ExternalRender());
libPlayer.SmartPlayerSetExternalAudioOutput(playerHandle, new PlayerExternalPcmOutput());
libPlayer.SmartPlayerSetAudioOutputType(playerHandle, 1);
libPlayer.SmartPlayerSetBuffer(playerHandle, playbackBuffer);
libPlayer.SmartPlayerSetFastStartup(playerHandle, isPlaybackFastStartup ? 1 : 0);
if (isPlaybackMute) {
libPlayer.SmartPlayerSetMute(playerHandle, isPlaybackMute ? 1 : 0);
}
if (isPlaybackHardwareDecoder) {
int isSupportHevcHwDecoder = libPlayer.SetSmartPlayerVideoHevcHWDecoder(playerHandle, 1);
int isSupportH264HwDecoder = libPlayer
.SetSmartPlayerVideoHWDecoder(playerHandle, 1);
Log.i(TAG, "isSupportH264HwDecoder: " + isSupportH264HwDecoder + ", isSupportHevcHwDecoder: " + isSupportHevcHwDecoder);
}
;
if (playbackUrl == null) {
Log.e(PLAY_TAG, "playback URL with NULL...");
return;
}
libPlayer.SmartPlayerSetAudioVolume(playerHandle, curAudioVolume);
libPlayer.SmartPlayerSetUrl(playerHandle, playbackUrl);
int iPlaybackRet = libPlayer.SmartPlayerStartPlay(playerHandle);
if (iPlaybackRet != 0) {
releasePlayerHandle();
Log.e(PLAY_TAG, "StartPlayback stream failed..");
return;
}
btnPlaybackStartStopPlayback.setText("停止播放");
btnPlaybackPopInputUrl.setEnabled(false);
btnPlaybackHardwareDecoder.setEnabled(false);
btnPlaybackSetPlayBuffer.setEnabled(false);
btnPlaybackFastStartup.setEnabled(false);
isPlaybackViewStarted = true;
Log.i(PLAY_TAG, "Start playback stream--");
}
}
});技术总结
Android平台一对一互动，纯内网环境下，不部署单独的流媒体服务器，走轻量级RTSP服务真的非常方便，感兴趣的开发者可以尝试看看。
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