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：

ini 复制代码

/*
 * 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：

ini 复制代码

/*
 * 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：

kotlin 复制代码

/*
 * 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：

ini 复制代码

/*
 * 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：

csharp 复制代码

/*
 * 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：

kotlin 复制代码

/*
 * 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；$
$事件回调\]支持网络状态、buffer状态等回调；$
$音频格式\]支持AAC/PCMA/PCMU；$
$H.264硬解码\]Windows/Android/iOS支持特定机型H.264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 TCP/UDP自动切换\]支持RTSP TCP、UDP模式自动切换；$
$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；$
$首屏秒开\]支持首屏秒开模式；$
$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；$
$实时静音\]支持播放过程中，实时静音/取消静音；$
$实时快照\]支持播放过程中截取当前播放画面；$
$渲染角度\]支持0°，90°，180°和270°四个视频画面渲染角度设置；$
$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)；$
$解码前视频数据回调\]支持H.264/H.265数据回调；$
$解码前音频数据回调\]支持AAC/PCMA/PCMU数据回调；$
$扩展录像功能\]完美支持和录像SDK组合使用。$