VideoStreamingThread.java 文件源码

@Override
protected byte[] doInBackground(Object... objs) {
    byte[] frame = (byte[]) objs[0];
    Parameters parameters = (Parameters) objs[1];
    if (frame_firstUpdateTime == 0) {
        frame_firstUpdateTime = System.currentTimeMillis();
    }
    frame_currentUpdateTime = System.currentTimeMillis();

    int datasize = 0;
    cameraImageSize = parameters.getPreviewSize();
    YuvImage image = new YuvImage(frame, parameters.getPreviewFormat(), cameraImageSize.width,
            cameraImageSize.height, null);
    ByteArrayOutputStream tmpBuffer = new ByteArrayOutputStream();
    image.compressToJpeg(new Rect(0, 0, image.getWidth(), image.getHeight()), 90, tmpBuffer);
    Log.d(LOG_TAG, "compression took: "
            + (System.currentTimeMillis()-frame_currentUpdateTime));
    synchronized (frameLock) {
        frameBuffer = tmpBuffer.toByteArray();
        frameGeneratedTime = System.currentTimeMillis();
        frameID++;
        frameLock.notify();
    }
    datasize = tmpBuffer.size();
    frame_count++;
    frame_totalsize += datasize;
    if (frame_count % 50 == 0) {
        Log.d(LOG_TAG, "(IMG)\t" +
                "BW: " + 8.0 * frame_totalsize / (frame_currentUpdateTime - frame_firstUpdateTime) / 1000 +
                " Mbps\tCurrent FPS: " + 8.0 * datasize / (frame_currentUpdateTime - frame_prevUpdateTime) / 1000 + " Mbps\t" +
                "FPS: " + 1000.0 * frame_count / (frame_currentUpdateTime - frame_firstUpdateTime));
    }
    frame_prevUpdateTime = frame_currentUpdateTime;
    return tmpBuffer.toByteArray();
}