device-2020-03-11-152608.png

先上代碼：

public class ShareREC {
    private static final String TAG = ShareREC.class.getSimpleName();

    private static final long DEFAULT_TIMEOUT_US = 10000;
    private static final int DEFAULT_FRAME_RATE = 20;
    private static final int DEFAULT_I_FRAME_INTERVAL = 1;
    private static final int DEFAULT_BITRATE = 2000000;
    static final int VIDEO_WIDTH = 640;
    static final int VIDEO_HEIGHT = 480;

    private MediaProjection mMp;
    private VirtualDisplay mVd;
    private volatile boolean mRunning;

    public void start(MediaProjection data) {
        if (mRunning) {
            release();
            return;
        }
        mMp = data;
        Observable.create((Observable.OnSubscribe<Boolean>) subscriber -> {
            try {
                initEncoder();
                initDecode();
                mRunning = true;
                doRecord();
            } catch (Exception e) {
                Log.e(TAG, e.getMessage());
                if (mOnDecoderCallback != null) {
                    mOnDecoderCallback.onError();
                }
            } finally {
                release();
            }
        }).observeOn(AndroidSchedulers.mainThread())
                .subscribeOn(Schedulers.io())
                .subscribe();
    }

    private MediaCodec mEncoder; //編碼器
    private MediaCodec.BufferInfo mEncoderBufferInfo;
    private byte[] SPS;
    private byte[] PPS;

    // 初始化錄屏
    private void initEncoder() throws IOException {
        MediaFormat mediaFormat = MediaFormat.createVideoFormat(MediaFormat.MIMETYPE_VIDEO_AVC, VIDEO_WIDTH, VIDEO_HEIGHT);
        mediaFormat.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatSurface);
        mediaFormat.setInteger(MediaFormat.KEY_BIT_RATE, DEFAULT_BITRATE);
        mediaFormat.setInteger(MediaFormat.KEY_FRAME_RATE, DEFAULT_FRAME_RATE);
        mediaFormat.setInteger(MediaFormat.KEY_I_FRAME_INTERVAL, DEFAULT_I_FRAME_INTERVAL);
        mEncoder = MediaCodec.createEncoderByType(MediaFormat.MIMETYPE_VIDEO_AVC);
        mEncoder.configure(mediaFormat, null, null, MediaCodec.CONFIGURE_FLAG_ENCODE);
        Surface inputSurface = mEncoder.createInputSurface();
        mEncoder.start();
        mVd = mMp.createVirtualDisplay("ShareREC",
                VIDEO_WIDTH, VIDEO_HEIGHT, 1,
                DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC,
                inputSurface, null, null);
        mEncoderBufferInfo = new MediaCodec.BufferInfo();
        Log.d(TAG, "initEncoder()");
    }

    private MediaCodec mDeCodec; // 解碼器
    private MediaCodec.BufferInfo mDecodeBufferInfo;
    private OnDecoderCallback mOnDecoderCallback;

    // 初始化解碼器
    private void initDecode() throws IOException {
        // 獲取硬件編碼器支持的顏色格式牡借，一般是I420或者NV12
        mDecodeBufferInfo = new MediaCodec.BufferInfo();
        MediaFormat format = MediaFormat.createVideoFormat(MediaFormat.MIMETYPE_VIDEO_AVC, VIDEO_WIDTH, VIDEO_HEIGHT);
        format.setInteger(MediaFormat.KEY_COLOR_FORMAT, MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Flexible);
        mDeCodec = MediaCodec.createDecoderByType(MediaFormat.MIMETYPE_VIDEO_AVC);
        mDeCodec.configure(format, null, null, 0);
        mDeCodec.start();
        Log.d(TAG, "initDecode()");
    }

    private void doRecord() {
        Log.d(TAG, "doRecord Start");
        while (mRunning && mEncoder != null) {
            int index = mEncoder.dequeueOutputBuffer(mEncoderBufferInfo, DEFAULT_TIMEOUT_US);
            if (index == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
                MediaFormat newFormat = mEncoder.getOutputFormat();
                // 獲取編碼SPS和PPS信息
                SPS = newFormat.getByteBuffer("csd-0").array();
                PPS = newFormat.getByteBuffer("csd-1").array();
            } else if (index == MediaCodec.INFO_TRY_AGAIN_LATER) {
                // wait 10ms
                try {
                    Thread.sleep(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            } else if (index > 0) {
                ByteBuffer buffer = mEncoder.getOutputBuffer(index);
                if ((mEncoderBufferInfo.flags & MediaCodec.BUFFER_FLAG_CODEC_CONFIG) != 0) {
                    mEncoderBufferInfo.size = 0;
                }
                if (mEncoderBufferInfo.size == 0) {
                    buffer = null;
                }
                if (buffer != null) {
                    buffer.position(mEncoderBufferInfo.offset);
                    buffer.limit(mEncoderBufferInfo.offset + mEncoderBufferInfo.size);
                    byte[] h264Bytes;
                    if (mEncoderBufferInfo.flags == MediaCodec.BUFFER_FLAG_KEY_FRAME) {
                        // 關鍵幀上添加sps,和pps信息
                        h264Bytes = new byte[mEncoderBufferInfo.size + SPS.length + PPS.length];
                        System.arraycopy(SPS, 0, h264Bytes, 0, SPS.length);
                        System.arraycopy(PPS, 0, h264Bytes, SPS.length, PPS.length);
                        buffer.get(h264Bytes, SPS.length + PPS.length, mEncoderBufferInfo.size);
                    } else {
                        h264Bytes = new byte[mEncoderBufferInfo.size];
                        buffer.get(h264Bytes, 0, mEncoderBufferInfo.size);
                    }
                    decode(h264Bytes);
                }
                mEncoder.releaseOutputBuffer(index, false);
            }
        }
        Log.d(TAG, "doRecord End");
    }

    private void decode(byte[] h264Data) {
        int inputBufferIndex = mDeCodec.dequeueInputBuffer(DEFAULT_TIMEOUT_US);
        if (inputBufferIndex > 0) {
            ByteBuffer inputBuffer;
            inputBuffer = mDeCodec.getInputBuffer(inputBufferIndex);
            if (inputBuffer != null) {
                inputBuffer.clear();
                inputBuffer.put(h264Data, 0, h264Data.length);
                mDeCodec.queueInputBuffer(inputBufferIndex, 0, h264Data.length, 0, 0);
            }
        }
        doDeCode();
    }

    private void doDeCode() {
        int outputBufferIndex = mDeCodec.dequeueOutputBuffer(mDecodeBufferInfo, DEFAULT_TIMEOUT_US);
        ByteBuffer outputBuffer;
        while (mRunning && outputBufferIndex > 0) {
            outputBuffer = mDeCodec.getOutputBuffer(outputBufferIndex);
            if (outputBuffer != null) {
                outputBuffer.position(0);
                outputBuffer.limit(mDecodeBufferInfo.offset + mDecodeBufferInfo.size);
                byte[] yuvData = new byte[outputBuffer.remaining()];
                outputBuffer.get(yuvData);
                MediaFormat mediaFormat = mDeCodec.getOutputFormat();
                switch (mediaFormat.getInteger(MediaFormat.KEY_COLOR_FORMAT)) {
                    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV411Planar:
                        break;
                    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV411PackedPlanar:
                        break;
                    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedPlanar:
                        break;
                    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420SemiPlanar:
                        yuvData = yuv420spToYuv420P(yuvData);
                        break;
                    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420PackedSemiPlanar:
                        break;
                    case MediaCodecInfo.CodecCapabilities.COLOR_FormatYUV420Planar:
                    default:
                        break;
                }
                Log.d(TAG, "decode byte size " + yuvData.length);
                if (null != mOnDecoderCallback) {
                    mOnDecoderCallback.onFrame(yuvData);
                }
                mDeCodec.releaseOutputBuffer(outputBufferIndex, false);
                outputBuffer.clear();
            }
            outputBufferIndex = mDeCodec.dequeueOutputBuffer(mDecodeBufferInfo, DEFAULT_TIMEOUT_US);
        }
    }

    private static byte[] yuv420spToYuv420P(byte[] yuv420spData) {
        byte[] yuv420pData = new byte[ShareREC.VIDEO_WIDTH * ShareREC.VIDEO_HEIGHT * 3 / 2];
        int ySize = ShareREC.VIDEO_WIDTH * ShareREC.VIDEO_HEIGHT;
        System.arraycopy(yuv420spData, 0, yuv420pData, 0, ySize);   //拷貝 Y 分量

        for (int j = 0, i = 0; j < ySize / 2; j += 2, i++) {
            yuv420pData[ySize + i] = yuv420spData[ySize + j];   //U 分量
            yuv420pData[ySize * 5 / 4 + i] = yuv420spData[ySize + j + 1];   //V 分量
        }
        return yuv420pData;
    }

    void setDecoderCallback(OnDecoderCallback onDecoderCallback) {
        mOnDecoderCallback = onDecoderCallback;
    }

    public void stop() {
        mRunning = false;
        Log.d(TAG, "stop");
    }

    public void release() {
        mRunning = false;
        if (mEncoder != null) {
            mEncoder.stop();
            mEncoder.release();
            mEncoder = null;
        }
        if (mVd != null) {
            mVd.release();
            mVd = null;
        }
        if (mDeCodec != null) {
            mDeCodec.stop();
            mDeCodec.release();
            mDeCodec = null;
        }
        if (mMp != null) {
            mMp.stop();
        }
        Log.d(TAG, "release");
    }

    public interface OnDecoderCallback {
        void onFrame(byte[] yuvData);

        void onError();
    }
}