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 static VideoCodecMeta createCodecMeta(
VirtualTrack src, H264Encoder encoder, int thumbWidth, int thumbHeight) {
VideoCodecMeta codecMeta = (VideoCodecMeta) src.getCodecMeta();
AvcCBox createAvcC =
H264Utils.createAvcC(
encoder.initSPS(new Size(thumbWidth, thumbHeight)), encoder.initPPS(), 4);
return VideoCodecMeta.createVideoCodecMeta(
"avc1",
H264Utils.getAvcCData(createAvcC),
new Size(thumbWidth, thumbHeight),
codecMeta.getPasp());
}