@Override
public boolean sniff(ExtractorInput input) throws IOException, InterruptedException {
scratch.peek(input, 2);
int packetType = scratch.getU16();
return (packetType == Connection.XVDR_STREAM_CHANGE
|| packetType == Connection.XVDR_STREAM_MUXPKT);
}
@Override
public synchronized int read(ExtractorInput input, PositionHolder seekPosition)
throws IOException, InterruptedException {
// read packet header
// messageId uint16 2 bytes
// frameType uint16 2 bytes
// length uint32 4 bytes
scratch.read(input, 4);
int messageId = scratch.getU16();
int frameType = scratch.getU16();
// check for format packet
if (messageId == Connection.XVDR_STREAM_CHANGE) {
Log.d(TAG, "stream change packet received");
scratch.peek(input, 512);
updateStreamReaders(scratch);
int bytesRead = scratch.position();
Log.d(TAG, "skipping " + bytesRead + " bytes (stream change packet)");
input.skipFully(bytesRead);
// reset position reference
position.reset();
return RESULT_CONTINUE;
}
// exit if we didn't receive a stream packet
if (messageId != Connection.XVDR_STREAM_MUXPKT) {
Log.d(TAG, "unknown message id: " + messageId);
return RESULT_CONTINUE;
}
// read stream packet header
// pid uint16 2 bytes
// pts int64 8 bytes
// dts int64 8 bytes
// duration uint32 4 bytes
// length uint32 4 bytes
scratch.read(input, 26);
int pid = scratch.getU16();
long pts = scratch.getS64();
long dts = scratch.getS64();
scratch.getU32();
int size = (int) scratch.getU32(); // size of encapsulated stream data
StreamReader reader = streamManager.get(pid);
// unknown stream ?
if (reader == null) {
input.skipFully(size);
input.skipFully(8);
return RESULT_CONTINUE;
}
// convert TS -> timeUs
long timeUs = position.adjustTimestamp(pts);
// consume stream data
reader.consume(input, size, timeUs, C.BUFFER_FLAG_KEY_FRAME);
// get current position
// position uint64 8 bytes
scratch.read(input, 8);
long pos = scratch.getU64();
// sanity check if position is within the range
if (position.getStartPosition() < pos && pos < position.getEndPosition()) {
position.set(timeUs, pos);
}
return RESULT_CONTINUE;
}
