1.主要流程

录屏(涉及的Android Api: MediaProjectionManager, MediaProjection,VirtualDisplay可以参考：https://blog.csdn.net/ss182172633/article/details/79480853)

编码(通常编为：H264编码，使用api: MediaCodec)

封包(使用的API：MediaMuxer)

发送(rtsp)

2.关于开源项目：ScreenRecorder

在界面中获取所有可配置的信息EncodeConfig(MediaCodec，MediaMuxer都会使用)

主要方法：

获取MediaProjectionManager实例

mMediaProjectionManager = (MediaProjectionManager) getApplicationContext().getSystemService(MEDIA_PROJECTION_SERVICE);

录屏授权

Intent captureIntent = mMediaProjectionManager.createScreenCaptureIntent();

startActivityForResult(captureIntent, REQUEST_MEDIA_PROJECTION);

授权后获取实例

MediaProjection mediaProjection = mMediaProjectionManager.getMediaProjection(resultCode, data);

VirtualDisplay virtualDisplay = mediaProjection.createVirtualDisplay("ScreenRecorder-display0",

config.width, config.height, 1 /*dpi*/,

DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC,

null /*surface*/, null, null);

mVirtualDisplay.setSurface(mVideoEncoder.getInputSurface());

创建封包器并丢数据进出

mMuxer = new MediaMuxer(mDstPath, MediaMuxer.OutputFormat.MUXER_OUTPUT_MPEG_4);

writeSampleData(mVideoTrackIndex, buffer, encodedData);

通过MediaCodec获取h264数据

MediaFormat format = createMediaFormat();

Log.d("Encoder", "Create media format: " + format);

String mimeType = format.getString(MediaFormat.KEY_MIME);

final MediaCodec encoder = createEncoder(mimeType);

try {

if (this.mCallback != null) {

// NOTE: MediaCodec maybe crash on some devices due to null callback

encoder.setCallback(mCodecCallback);

}

encoder.configure(format, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);

onEncoderConfigured(encoder);

encoder.start();

} catch (MediaCodec.CodecException e) {

Log.e("Encoder", "Configure codec failure!\n with format" + format, e);

throw e;

}

MediaCodec 运行状态，编码后的数据通过回掉返回

/**

* let media codec run async mode if mCallback != null

*/

private MediaCodec.Callback mCodecCallback = new MediaCodec.Callback() {

@Override

public void onInputBufferAvailable(MediaCodec codec, int index) {

mCallback.onInputBufferAvailable(BaseEncoder.this, index);

}

@Override

public void onOutputBufferAvailable(MediaCodec codec, int index, MediaCodec.BufferInfo info) {

mCallback.onOutputBufferAvailable(BaseEncoder.this, index, info);

}

@Override

public void onError(MediaCodec codec, MediaCodec.CodecException e) {

mCallback.onError(BaseEncoder.this, e);

}

@Override

public void onOutputFormatChanged(MediaCodec codec, MediaFormat format) {

mCallback.onOutputFormatChanged(BaseEncoder.this, format);

}

};