Android平台轻量级RTSP服务模块二次封装版调用说明

技术背景

在前面的blog，我们发布了Android平台轻量级RTSP服务模块的技术对接说明，好多开发者希望，更黑盒的对接轻量级RTSP服务这块，专注于自身业务逻辑。为此，我们针对Android平台轻量级RTSP服务模块，做了更进一步的封装（LibPublisherWrapper.java）。

技术对接

本文还是以大牛直播SDK Android平台Camera2Demo为例，如果需要测试轻量级RTSP服务模块，分两步：首先启动RTSP服务，RTSP服务启动后，发布RTSP即可，在此之前，可选择设置视频分辨率、软硬编码类型，音频编码类型等，如需关闭轻量级RTSP服务，先停止发布RTSP流，再停止RTSP服务。

onCreate()的时候，调用LibPublisherWrapper的initialize_sdk()：

scss 复制代码

/*
 * MainActivity.java
 * Author: daniusdk.com
 */
@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.activity_main);
	
	...

	context_ = this.getApplicationContext();
	
	libPublisher = new SmartPublisherJniV2();

	LibPublisherWrapper.RTSPServer.initialize_sdk(libPublisher, context_);
}

对应封装代码如下：

typescript 复制代码

public static boolean initialize_sdk(SmartPublisherJniV2 lib_publisher, android.content.Context context) {
	return sdk_context_.initialize(lib_publisher, context);
}

initalize()具体实现如下：

ini 复制代码

/*
 * LibPublisherWrapper.java
 * Author: daniusdk.com
 */
public boolean initialize(SmartPublisherJniV2 lib_publisher, android.content.Context context) {
	if (initialized_)
		return initialized_result_;

	if (null == lib_publisher)
		return false;

	if (null == context)
		return false;

	synchronized (this) {
		if (initialized_)
			return initialized_result_;

		try {
			int sdk_ret = lib_publisher.InitRtspServer(context);
			if (0 == sdk_ret)
				initialized_result_ = true;
			else {
				initialized_result_ = false;
				Log.e(TAG, "call sdk InitRtspServer failed, ret:" + sdk_ret);
			}
		} catch (Exception e) {
			initialized_result_ = false;
			Log.e(TAG, "call sdk InitRtspServer Exception:", e);
		}

		initialized_ = true;
		return initialized_result_;
	}
}

启动、停止RTSP服务：

ini 复制代码

//启动/停止RTSP服务
class ButtonRtspServiceListener implements View.OnClickListener {
	public void onClick(View v) {
		if (!rtsp_server_.empty()) {
			rtsp_server_.reset();
			btnRtspService.setText("启动RTSP服务");
			btnRtspPublisher.setEnabled(false);
			return;
		}

		Log.i(TAG, "onClick start rtsp service..");

		int port = 8554;
		String user_name = null;
		String password = null;
		LibPublisherWrapper.RTSPServer.Handle server_handle = LibPublisherWrapper.RTSPServer.create_and_start_server(libPublisher,
				port, user_name, password);

		if (null == server_handle) {
			Log.e(TAG, "启动rtsp server失败! 请检查设置的端口是否被占用!");
			return;
		}

		rtsp_server_.reset(server_handle);

		btnRtspService.setText("停止RTSP服务");
		btnRtspPublisher.setEnabled(true);
	}
}

发布、停止RTSP流：

scss 复制代码

//发布/停止RTSP流
class ButtonRtspPublisherListener implements View.OnClickListener {
	public void onClick(View v) {
		if (stream_publisher_.is_rtsp_publishing()) {
			stopRtspPublisher();

			btnRtspPublisher.setText("发布RTSP流");
			btnGetRtspSessionNumbers.setEnabled(false);
			btnRtspService.setEnabled(true);
			return;
		}

		Log.i(TAG, "onClick start rtsp publisher..");

		InitAndSetConfig();

		String rtsp_stream_name = "stream1";
		stream_publisher_.SetRtspStreamName(rtsp_stream_name);
		stream_publisher_.ClearRtspStreamServer();

		stream_publisher_.AddRtspStreamServer(rtsp_server_.get_native());

		if (!stream_publisher_.StartRtspStream()) {
			stream_publisher_.try_release();
			Log.e(TAG, "调用发布rtsp流接口失败!");
			return;
		}

		startAudioRecorder();
		startLayerPostThread();

		btnRtspPublisher.setText("停止RTSP流");
		btnGetRtspSessionNumbers.setEnabled(true);
		btnRtspService.setEnabled(false);
	}
}

stopRtspPublisher()实现如下：

scss 复制代码

//停止发布RTSP流
private void stopRtspPublisher() {
	stream_publisher_.StopRtspStream();
	stream_publisher_.try_release();

	if (!stream_publisher_.is_publishing())
		stopAudioRecorder();
}

其中，InitAndSetConfig()实现如下，通过调研SmartPublisherOpen()接口，生成推送实例句柄。

csharp 复制代码

/*
 * MainActivity.java
 * Author: daniusdk.com
 */
private void InitAndSetConfig() {
	if (null == libPublisher)
		return;

	if (!stream_publisher_.empty())
		return;

	Log.i(TAG, "InitAndSetConfig video width: " + video_width_ + ", height" + video_height_ + " imageRotationDegree:" + cameraImageRotationDegree_);

	int audio_opt = 1;
	long handle = libPublisher.SmartPublisherOpen(context_, audio_opt, 3,  video_width_, video_height_);
	if (0==handle) {
		Log.e(TAG, "sdk open failed!");
		return;
	}

	Log.i(TAG, "publisherHandle=" + handle);

	int fps = 25;
	int gop = fps * 3;

	initialize_publisher(libPublisher, handle, video_width_, video_height_, fps, gop);

	stream_publisher_.set(libPublisher, handle);
}

对应的initialize_publisher()实现如下，设置软硬编码、帧率、关键帧间隔等。

ini 复制代码

private boolean initialize_publisher(SmartPublisherJniV2 lib_publisher, long handle, int width, int height, int fps, int gop) {
	if (null == lib_publisher) {
		Log.e(TAG, "initialize_publisher lib_publisher is null");
		return false;
	}

	if (0 == handle) {
		Log.e(TAG, "initialize_publisher handle is 0");
		return false;
	}

	if (videoEncodeType == 1) {
		int kbps = LibPublisherWrapper.estimate_video_hardware_kbps(width, height, fps, true);
		Log.i(TAG, "h264HWKbps: " + kbps);
		int isSupportH264HWEncoder = lib_publisher.SetSmartPublisherVideoHWEncoder(handle, kbps);
		if (isSupportH264HWEncoder == 0) {
			lib_publisher.SetNativeMediaNDK(handle, 0);
			lib_publisher.SetVideoHWEncoderBitrateMode(handle, 1); // 0:CQ, 1:VBR, 2:CBR
			lib_publisher.SetVideoHWEncoderQuality(handle, 39);
			lib_publisher.SetAVCHWEncoderProfile(handle, 0x08); // 0x01: Baseline, 0x02: Main, 0x08: High

			// lib_publisher.SetAVCHWEncoderLevel(handle, 0x200); // Level 3.1
			// lib_publisher.SetAVCHWEncoderLevel(handle, 0x400); // Level 3.2
			// lib_publisher.SetAVCHWEncoderLevel(handle, 0x800); // Level 4
			lib_publisher.SetAVCHWEncoderLevel(handle, 0x1000); // Level 4.1 多数情况下,这个够用了
			//lib_publisher.SetAVCHWEncoderLevel(handle, 0x2000); // Level 4.2

			// lib_publisher.SetVideoHWEncoderMaxBitrate(handle, ((long)h264HWKbps)*1300);

			Log.i(TAG, "Great, it supports h.264 hardware encoder!");
		}
	} else if (videoEncodeType == 2) {
		int kbps = LibPublisherWrapper.estimate_video_hardware_kbps(width, height, fps, false);
		Log.i(TAG, "hevcHWKbps: " + kbps);
		int isSupportHevcHWEncoder = lib_publisher.SetSmartPublisherVideoHevcHWEncoder(handle, kbps);
		if (isSupportHevcHWEncoder == 0) {
			lib_publisher.SetNativeMediaNDK(handle, 0);
			lib_publisher.SetVideoHWEncoderBitrateMode(handle, 1); // 0:CQ, 1:VBR, 2:CBR
			lib_publisher.SetVideoHWEncoderQuality(handle, 39);

			// libPublisher.SetVideoHWEncoderMaxBitrate(handle, ((long)hevcHWKbps)*1200);

			Log.i(TAG, "Great, it supports hevc hardware encoder!");
		}
	}

	boolean is_sw_vbr_mode = true;
	//H.264 software encoder
	if (is_sw_vbr_mode) {
		int is_enable_vbr = 1;
		int video_quality = LibPublisherWrapper.estimate_video_software_quality(width, height, true);
		int vbr_max_kbps = LibPublisherWrapper.estimate_video_vbr_max_kbps(width, height, fps);
		lib_publisher.SmartPublisherSetSwVBRMode(handle, is_enable_vbr, video_quality, vbr_max_kbps);
	}

	if (is_pcma_) {
		lib_publisher.SmartPublisherSetAudioCodecType(handle, 3);
	} else {
		lib_publisher.SmartPublisherSetAudioCodecType(handle, 1);
	}

	lib_publisher.SetSmartPublisherEventCallbackV2(handle, new EventHandlerPublisherV2().set(handler_, record_executor_));

	lib_publisher.SmartPublisherSetSWVideoEncoderProfile(handle, 3);

	lib_publisher.SmartPublisherSetSWVideoEncoderSpeed(handle, 2);

	lib_publisher.SmartPublisherSetGopInterval(handle, gop);

	lib_publisher.SmartPublisherSetFPS(handle, fps);

	// lib_publisher.SmartPublisherSetSWVideoBitRate(handle, 600, 1200);

	boolean is_noise_suppression = true;
	lib_publisher.SmartPublisherSetNoiseSuppression(handle, is_noise_suppression ? 1 : 0);

	boolean is_agc = false;
	lib_publisher.SmartPublisherSetAGC(handle, is_agc ? 1 : 0);

	int echo_cancel_delay = 0;
	lib_publisher.SmartPublisherSetEchoCancellation(handle, 1, echo_cancel_delay);

	return true;
}

发布RTSP流成功后，会回调上来可供拉流的RTSP URL：

arduino 复制代码

private static class EventHandlerPublisherV2 implements NTSmartEventCallbackV2 {
	@Override
	public void onNTSmartEventCallbackV2(long handle, int id, long param1, long param2, String param3, String param4, Object param5) {

		switch (id) {
			...
			case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RTSP_URL:
				publisher_event = "RTSP服务URL: " + param3;
				break;
		}
	}
}

获取RTSP Session会话数：

java 复制代码

//获取RTSP会话数
class ButtonGetRtspSessionNumbersListener implements View.OnClickListener {
	public void onClick(View v) {
		if (rtsp_server_.is_running()) {
			int session_numbers = rtsp_server_.get_client_session_number();
			Log.i(TAG, "GetRtspSessionNumbers: " + session_numbers);

			PopRtspSessionNumberDialog(session_numbers);
		}
	}
}

对应的Wrapper封装代码如下：

csharp 复制代码

public int get_client_session_number() {
	if (!is_running())
		return 0;

	if (null == lib_publisher_)
		return 0;

	long handle = native_handle_.get();
	if (0 == handle)
		return 0;

	try {
		int ret = lib_publisher_.GetRtspServerClientSessionNumbers(handle);
		return ret;
	} catch (Exception e) {
		Log.e(TAG, "RTSPServer.Handle.get_client_session_number Exception:", e);
		return 0;
	}
}

数据投递如下（以Camera2采集为例，如果是其他视频格式，也可以正常对接）：

scss 复制代码

@Override
public void onCameraImageData(Image image) {
	....
	for (LibPublisherWrapper i : publisher_array_)
		i.PostLayerImageYUV420888ByteBuffer(0, 0, 0,
			planes[0].getBuffer(), y_offset, planes[0].getRowStride(),
			planes[1].getBuffer(), u_offset, planes[1].getRowStride(),
			planes[2].getBuffer(), v_offset, planes[2].getRowStride(), planes[1].getPixelStride(),
			w, h, 0, 0,
			scale_w, scale_h, scale_filter_mode, rotation_degree);

}

音频采集投递设计如下：

ini 复制代码

void startAudioRecorder() {
	if (audio_recorder_ != null)
		return;

	audio_recorder_ = new NTAudioRecordV2(this);

	Log.i(TAG, "startAudioRecorder call audio_recorder_.start()+++...");

	audio_recorder_callback_ = new NTAudioRecordV2CallbackImpl(stream_publisher_, null);

	audio_recorder_.AddCallback(audio_recorder_callback_);

	if (!audio_recorder_.Start(is_pcma_ ? 8000 : 44100, 1) ) {
		audio_recorder_.RemoveCallback(audio_recorder_callback_);
		audio_recorder_callback_ = null;

		audio_recorder_ = null;

		Log.e(TAG, "startAudioRecorder start failed.");
	}
	else {
		Log.i(TAG, "startAudioRecorder call audio_recorder_.start() OK---...");
	}
}

void stopAudioRecorder() {
	if (null == audio_recorder_)
		return;

	Log.i(TAG, "stopAudioRecorder+++");

	audio_recorder_.Stop();

	if (audio_recorder_callback_ != null) {
		audio_recorder_.RemoveCallback(audio_recorder_callback_);
		audio_recorder_callback_ = null;
	}

	audio_recorder_ = null;

	Log.i(TAG, "stopAudioRecorder---");
}

回调Audio数据的地方，直接投递出去：

java 复制代码

private static class NTAudioRecordV2CallbackImpl implements NTAudioRecordV2Callback {
	private WeakReference<LibPublisherWrapper> publisher_0_;

	public NTAudioRecordV2CallbackImpl(LibPublisherWrapper publisher_0) {
		if (publisher_0 != null)
			publisher_0_ = new WeakReference<>(publisher_0);
	}

	private final LibPublisherWrapper get_publisher_0() {
		if (publisher_0_ !=null)
			return publisher_0_.get();

		return null;
	}

	@Override
	public void onNTAudioRecordV2Frame(ByteBuffer data, int size, int sampleRate, int channel, int per_channel_sample_number) {

		LibPublisherWrapper publisher_0 = get_publisher_0();
		if (publisher_0 != null)
			publisher_0.OnPCMData(data, size, sampleRate, channel, per_channel_sample_number);
	}
}

onDestroy() 的时候，调用deinitialize_sdk()即可：

scss 复制代码

@Override
protected void onDestroy() {
	Log.i(TAG, "activity destory!");

	stopAudioRecorder();

	stopRtspPublisher();

	stream_publisher_.release();

    rtsp_server_.reset();

    //如已启用内置服务功能(InitRtspServer)，调用UnInitRtspServer, 注意，即便是启动多个RTSP服务，也只需调用UnInitRtspServer一次
    LibPublisherWrapper.RTSPServer.deinitialize_sdk(libPublisher);

	stopLayerPostThread();

	if (camera2Helper != null) {
		camera2Helper.release();
	}

	super.onDestroy();
}

总结

Android平台轻量级RTSP服务模块二次封装版，相对接口版，对接更方便。开发者无需关注底层实现，可以更方便的对接到自己的业务系统。感兴趣的开发者，可以单独跟我们探讨。