public ByteBuffer transcodeFrame(ByteBuffer src, ByteBuffer dst) throws IOException {
if (src == null) return null;
Picture8Bit decoded = decoder.decodeFrame8Bit(src, pic0.getData());
if (pic1 == null) {
pic1 =
Picture8Bit.create(
decoded.getWidth(), decoded.getHeight(), encoder.getSupportedColorSpaces()[0]);
transform =
ColorUtil.getTransform8Bit(decoded.getColor(), encoder.getSupportedColorSpaces()[0]);
}
transform.transform(decoded, pic1);
pic1.setCrop(new Rect(0, 0, track.thumbWidth, track.thumbHeight));
int rate = TARGET_RATE;
do {
try {
encoder.encodeFrame8Bit(pic1, dst);
break;
} catch (BufferOverflowException ex) {
Logger.warn("Abandon frame, buffer too small: " + dst.capacity());
rate -= 10;
rc.setRate(rate);
}
} while (rate > 10);
rc.setRate(TARGET_RATE);
H264Utils.encodeMOVPacket(dst);
return dst;
}
public Transcode2AVCTrack(VirtualTrack src, Size frameDim) {
this.transcoders = new ThreadLocal<Transcoder>();
checkFourCC(src);
this.src = src;
H264FixedRateControl rc = new H264FixedRateControl(TARGET_RATE);
H264Encoder encoder = new H264Encoder(rc);
scaleFactor = selectScaleFactor(frameDim);
thumbWidth = frameDim.getWidth() >> scaleFactor;
thumbHeight = (frameDim.getHeight() >> scaleFactor) & ~1;
mbW = (thumbWidth + 15) >> 4;
mbH = (thumbHeight + 15) >> 4;
se = createCodecMeta(src, encoder, thumbWidth, thumbHeight);
frameSize = rc.calcFrameSize(mbW * mbH);
frameSize += frameSize >> 4;
}