AndroidCameraOutputMJPEG.java 文件源码

@Override
public void onPreviewFrame(byte[] data, Camera camera)
{
    long timeStamp = SystemClock.elapsedRealtimeNanos();

    // select current buffer
    YuvImage yuvImg = (data == imgBuf1) ? yuvImg1 : yuvImg2;

    // compress as JPEG
    jpegBuf.reset();
    yuvImg.compressToJpeg(imgArea, 90, jpegBuf);

    // release buffer for next frame
    camera.addCallbackBuffer(data);

    // generate new data record
    DataBlock newRecord;
    if (latestRecord == null)
        newRecord = dataStruct.createDataBlock();
    else
        newRecord = latestRecord.renew();

    // set time stamp
    double samplingTime = getJulianTimeStamp(timeStamp);
    newRecord.setDoubleValue(0, samplingTime);

    // set encoded data
    AbstractDataBlock frameData = ((DataBlockMixed)newRecord).getUnderlyingObject()[1];
    frameData.setUnderlyingObject(jpegBuf.toByteArray());

    // send event
    latestRecord = newRecord;
    latestRecordTime = System.currentTimeMillis();
    eventHandler.publishEvent(new SensorDataEvent(latestRecordTime, AndroidCameraOutputMJPEG.this, latestRecord));          
}