/**
* Breaks-up the aggregate into its individual parts and returns them as a list. The parts are
* returned based on the ordering of the aggregate itself.
*
* @return list of IRTMPEvent objects
*/
public LinkedList<IRTMPEvent> getParts() {
LinkedList<IRTMPEvent> parts = new LinkedList<IRTMPEvent>();
log.trace("Aggregate data length: {}", data.limit());
int position = data.position();
do {
try {
// read the header
// log.trace("Hex: {}", data.getHexDump());
byte subType = data.get();
// when we run into subtype 0 break out of here
if (subType == 0) {
log.debug("Subtype 0 encountered within this aggregate, processing with exit");
break;
}
int size = IOUtils.readUnsignedMediumInt(data);
log.debug("Data subtype: {} size: {}", subType, size);
// TODO ensure the data contains all the bytes to support the specified size
int timestamp = IOUtils.readExtendedMediumInt(data);
/*timestamp = ntohap((GETIBPOINTER(buffer) + 4)); 0x12345678 == 34 56 78 12*/
int streamId = IOUtils.readUnsignedMediumInt(data);
log.debug("Data timestamp: {} stream id: {}", timestamp, streamId);
Header partHeader = new Header();
partHeader.setChannelId(header.getChannelId());
partHeader.setDataType(subType);
partHeader.setSize(size);
// use the stream id from the aggregate's header
partHeader.setStreamId(header.getStreamId());
partHeader.setTimer(timestamp);
// timer delta == time stamp - timer base
// the back pointer may be used to verify the size of the individual part
// it will be equal to the data size + header size
int backPointer = 0;
switch (subType) {
case TYPE_AUDIO_DATA:
AudioData audio = new AudioData(data.getSlice(size));
audio.setTimestamp(timestamp);
audio.setHeader(partHeader);
log.debug("Audio header: {}", audio.getHeader());
parts.add(audio);
// log.trace("Hex: {}", data.getHexDump());
// ensure 4 bytes left to read an int
if (data.position() < data.limit() - 4) {
backPointer = data.getInt();
// log.trace("Back pointer: {}", backPointer);
if (backPointer != (size + 11)) {
log.debug("Data size ({}) and back pointer ({}) did not match", size, backPointer);
}
}
break;
case TYPE_VIDEO_DATA:
VideoData video = new VideoData(data.getSlice(size));
video.setTimestamp(timestamp);
video.setHeader(partHeader);
log.debug("Video header: {}", video.getHeader());
parts.add(video);
// log.trace("Hex: {}", data.getHexDump());
// ensure 4 bytes left to read an int
if (data.position() < data.limit() - 4) {
backPointer = data.getInt();
// log.trace("Back pointer: {}", backPointer);
if (backPointer != (size + 11)) {
log.debug("Data size ({}) and back pointer ({}) did not match", size, backPointer);
}
}
break;
default:
log.debug("Non-A/V subtype: {}", subType);
Unknown unk = new Unknown(subType, data.getSlice(size));
unk.setTimestamp(timestamp);
unk.setHeader(partHeader);
parts.add(unk);
// ensure 4 bytes left to read an int
if (data.position() < data.limit() - 4) {
backPointer = data.getInt();
}
}
position = data.position();
} catch (Exception e) {
log.error("Exception decoding aggregate parts", e);
break;
}
log.trace("Data position: {}", position);
} while (position < data.limit());
log.trace("Aggregate processing complete, {} parts extracted", parts.size());
return parts;
}
