Android平台如何实现多路低延迟RTSP|RTMP播放？

技术背景

实际上，我们在2015年做Android平台RTSP、RTMP播放模块的时候，第一版就支持了多实例播放，因为SDK设计比较灵活，做个简单的player实例封装即可实现多实例播放（Android Unity的就有多路demo），所以官方一直没有正式demo，本次也是有个开发者提到，希望测试下我们多路播放的效果，自己又不想做封装，索性给做个版本。

技术实现

废话不多说，先上图：

我们针对的功能展示，主要是播放和录像这块，先说播放：

/** SmartPlayer.java* Author: https://daniusdk.com* Created by DaniuLive on 2015/09/26.*/
class ButtonPlayback1Listener implements View.OnClickListener {public void onClick(View v) {if (stream_player_1_.is_playing()) {Log.i(TAG, "Stop player1..");boolean iRet = stream_player_1_.StopPlayer();if (!iRet) {Log.e(TAG, "Call StopPlayer failed..");return;}stream_player_1_.try_release();btn_playback1.setText("开始播放1");SetViewVisibility(surface_view_1_);} else {Log.i(TAG, "Start playback stream1++");int play_buffer = 0;int is_using_tcp = 0;if(!stream_player_1_.OpenPlayerHandle(playback_url_1_, play_buffer, is_using_tcp))return;stream_player_1_.SetView(surface_view_1_);boolean is_mute = false;boolean iPlaybackRet = stream_player_1_.StartPlayer(isHardwareDecoder, is_enable_hardware_render_mode, is_mute);if (!iPlaybackRet) {Log.e(TAG, "Call StartPlayer failed..");return;}btn_playback1.setText("停止播放1");}}
}

对应的OpenPlayerHandle()实现如下：

/** LibPlayerWrapper.java.java* Author: https://daniusdk.com*/
public boolean OpenPlayerHandle(String playback_url, int play_buffer, int is_using_tcp) {if (check_native_handle())return true;if(!isValidRtspOrRtmpUrl(playback_url))return false;long handle = lib_player_.SmartPlayerOpen(application_context());if (0==handle) {Log.e(TAG, "sdk open failed!");return false;}lib_player_.SetSmartPlayerEventCallbackV2(handle, new EventHandleV2());lib_player_.SmartPlayerSetBuffer(handle, play_buffer);// set report download speed(默认2秒一次回调 用户可自行调整report间隔)lib_player_.SmartPlayerSetReportDownloadSpeed(handle, 1, 4);boolean isFastStartup = true;lib_player_.SmartPlayerSetFastStartup(handle, isFastStartup ? 1 : 0);//设置RTSP超时时间int rtsp_timeout = 10;lib_player_.SmartPlayerSetRTSPTimeout(handle, rtsp_timeout);//设置RTSP TCP/UDP模式自动切换int is_auto_switch_tcp_udp = 1;lib_player_.SmartPlayerSetRTSPAutoSwitchTcpUdp(handle, is_auto_switch_tcp_udp);lib_player_.SmartPlayerSaveImageFlag(handle, 1);// It only used when playback RTSP stream..lib_player_.SmartPlayerSetRTSPTcpMode(handle, is_using_tcp);lib_player_.DisableEnhancedRTMP(handle, 0);lib_player_.SmartPlayerSetUrl(handle, playback_url);set(handle);return true;
}

对应的开始播放、停止播放设计：

/** LibPlayerWrapper.java* Author: https://daniusdk.com*/
public boolean StartPlayer(boolean is_hardware_decoder, boolean is_enable_hardware_render_mode, boolean is_mute) {if (is_playing()) {Log.e(TAG, "already playing, native_handle:" + get());return false;}SetPlayerParam(is_hardware_decoder, is_enable_hardware_render_mode, is_mute);int ret = lib_player_.SmartPlayerStartPlay(get());if (ret != OK) {Log.e(TAG, "call StartPlay failed, native_handle:" + get() + ", ret:" + ret);return false;}write_lock_.lock();try {this.is_playing_ = true;} finally {write_lock_.unlock();}Log.i(TAG, "call StartPlayer OK, native_handle:" + get());return true;
}public boolean StopPlayer() {if (!check_native_handle())return false;if (!is_playing()) {Log.w(TAG, "it's not playing, native_handle:" + get());return false;}boolean is_need_call = false;write_lock_.lock();try {if (this.is_playing_) {this.is_playing_ = false;is_need_call = true;}} finally {write_lock_.unlock();}if (is_need_call)lib_player_.SmartPlayerStopPlay(get());return true;
}

录像设计：

/** SmartPlayer.java* Author: https://daniusdk.com*/
class ButtonRecorder1Listener implements View.OnClickListener {public void onClick(View v) {if (stream_player_1_.is_recording()) {Log.i(TAG, "Stop recorder1..");boolean iRet = stream_player_1_.StopRecorder();if (!iRet) {Log.e(TAG, "Call StopRecorder failed..");return;}stream_player_1_.try_release();btn_recorder1.setText("开始录像1");} else {Log.i(TAG, "Start recorder stream1++");int play_buffer = 0;int is_using_tcp = 0;if(!stream_player_1_.OpenPlayerHandle(playback_url_1_, play_buffer, is_using_tcp))return;stream_player_1_.ConfigRecorderParam(recDir, 400, 1, 1, 1);boolean iRecRet = stream_player_1_.StartRecorder();if (!iRecRet) {Log.e(TAG, "Call StartRecorder failed..");return;}btn_recorder1.setText("停止录像1");}}
}

录像参数配置选项：

/** LibPlayerWrapper.java* Author: https://daniusdk.com*/
public boolean ConfigRecorderParam(String rec_dir, int file_max_size, int is_transcode_aac,int is_record_video, int is_record_audio) {if(!check_native_handle())return false;if (null == rec_dir || rec_dir.isEmpty())return false;int ret = lib_player_.SmartPlayerCreateFileDirectory(rec_dir);if (ret != 0) {Log.e(TAG, "Create record dir failed, path:" + rec_dir);return false;}if (lib_player_.SmartPlayerSetRecorderDirectory(get(), rec_dir) != 0) {Log.e(TAG, "Set record dir failed , path:" + rec_dir);return false;}if (lib_player_.SmartPlayerSetRecorderFileMaxSize(get(),file_max_size) != 0) {Log.e(TAG, "SmartPlayerSetRecorderFileMaxSize failed.");return false;}lib_player_.SmartPlayerSetRecorderAudioTranscodeAAC(get(), is_transcode_aac);// 更细粒度控制录像的, 一般情况无需调用lib_player_.SmartPlayerSetRecorderVideo(get(), is_record_video);lib_player_.SmartPlayerSetRecorderAudio(get(), is_record_audio);return true;
}

开始录像、结束录像：

/** LibPlayerWrapper.java* Author: https://daniusdk.com*/
public boolean StartRecorder() {if (is_recording()) {Log.e(TAG, "already recording, native_handle:" + get());return false;}int ret = lib_player_.SmartPlayerStartRecorder(get());if (ret != OK) {Log.e(TAG, "call SmartPlayerStartRecorder failed, native_handle:" + get() + ", ret:" + ret);return false;}write_lock_.lock();try {this.is_recording_ = true;} finally {write_lock_.unlock();}Log.i(TAG, "call SmartPlayerStartRecorder OK, native_handle:" + get());return true;
}public boolean StopRecorder() {if (!check_native_handle())return false;if (!is_recording()) {Log.w(TAG, "it's not recording, native_handle:" + get());return false;}boolean is_need_call = false;write_lock_.lock();try {if (this.is_recording_) {this.is_recording_ = false;is_need_call = true;}} finally {write_lock_.unlock();}if (is_need_call)lib_player_.SmartPlayerStopRecorder(get());return true;
}

总结

说了这么多，以RTSP播放为例，大概说下实现的功能：

• [支持播放协议]高稳定、超低延迟、业内首屈一指的RTSP直播播放器SDK；
•  [多实例播放]支持多实例播放；
•  [事件回调]支持网络状态、buffer状态等回调；
•  [视频格式]支持H.265、H.264，此外，还支持RTSP MJPEG播放；
•  [音频格式]支持AAC/PCMA/PCMU；
•  [H.264/H.265软解码]支持H.264/H.265软解；
•  [H.264硬解码]Windows/Android/iOS支持特定机型H.264硬解；
•  [H.265硬解]Windows/Android/iOS支持特定机型H.265硬解；
•  [H.264/H.265硬解码]Android支持设置Surface模式硬解和普通模式硬解码；
•  [RTSP模式设置]支持RTSP TCP/UDP模式设置；
•  [RTSP TCP/UDP自动切换]支持RTSP TCP、UDP模式自动切换；
•  [RTSP超时设置]支持RTSP超时时间设置，单位：秒；
•  [RTSP 401认证处理]支持上报RTSP 401事件，如URL携带鉴权信息，会自动处理；
•  [缓冲时间设置]支持buffer time设置；
•  [首屏秒开]支持首屏秒开模式；
•  [复杂网络处理]支持断网重连等各种网络环境自动适配；
•  [快速切换URL]支持播放过程中，快速切换其他URL，内容切换更快；
•  [音视频多种render机制]Android平台，视频：surfaceview/OpenGL ES，音频：AudioTrack/OpenSL ES；
•  [实时静音]支持播放过程中，实时静音/取消静音；
•  [实时音量调节]支持播放过程中实时调节音量；
•  [实时快照]支持播放过程中截取当前播放画面；
•  [只播关键帧]Windows平台支持实时设置是否只播放关键帧；
•  [渲染角度]支持0°，90°，180°和270°四个视频画面渲染角度设置；
•  [渲染镜像]支持水平反转、垂直反转模式设置；
•  [等比例缩放]支持图像等比例缩放绘制(Android设置surface模式硬解模式不支持)；
•  [实时下载速度更新]支持当前下载速度实时回调(支持设置回调时间间隔)；
•  [解码前视频数据回调]支持H.264/H.265数据回调；
•  [解码后视频数据回调]支持解码后YUV/RGB数据回调；
•  [解码前音频数据回调]支持AAC/PCMA/PCMU数据回调；
•  [音视频自适应]支持播放过程中，音视频信息改变后自适应；
•  [扩展录像功能]完美支持和录像SDK组合使用。

上面只是简单的播放、录像的演示，除此之外，大牛直播SDK的RTSP、RTMP播放器海康实现播放缓冲设置、软硬解码设置、实时快照、实时音量调节、实时解码后数据回调等。毫秒级延迟，完全满足对延迟、稳定性要求苛刻的场景下。感兴趣的开发者，可以单独和我沟通。