/**
* Buffers the given packet up ready for writing to the stream, but doesn't write it to disk yet.
* The granule position is updated on the page. If writing the packet requires a new page, then
* the updated granule position only applies to the new page
*/
public void bufferPacket(OggPacket packet, long granulePosition) {
if (closed) {
throw new IllegalStateException("Can't buffer packets on a closed stream!");
}
if (!doneFirstPacket) {
packet.setIsBOS();
doneFirstPacket = true;
}
int size = packet.getData().length;
boolean emptyPacket = (size == 0);
// Add to pages in turn
OggPage page = getCurrentPage(false);
int pos = 0;
while (pos < size || emptyPacket) {
pos = page.addPacket(packet, pos);
if (pos < size) {
page = getCurrentPage(true);
page.setIsContinuation();
}
page.setGranulePosition(granulePosition);
emptyPacket = false;
}
currentGranulePosition = granulePosition;
packet.setParent(page);
}
/**
* Skips forward until the first packet with a Granule Position of equal or greater than that
* specified. Call {@link #getNextPacket()} to retrieve this packet. This method advances across
* all streams, but only searches the specified one.
*
* @param sid The ID of the stream who's packets we will search
* @param granulePosition The granule position we're looking for
*/
public void skipToGranulePosition(int sid, long granulePosition) throws IOException {
OggPacket p = null;
while ((p = getNextPacket()) != null) {
if (p.getSid() == sid && p.getGranulePosition() >= granulePosition) {
nextPacket = p;
break;
}
}
}
/**
* Skips forward until the first packet with a Sequence Number of equal or greater than that
* specified. Call {@link #getNextPacket()} to retrieve this packet. This method advances across
* all streams, but only searches the specified one.
*
* @param sid The ID of the stream who's packets we will search
* @param sequenceNumber The sequence number we're looking for
*/
public void skipToSequenceNumber(int sid, int sequenceNumber) throws IOException {
OggPacket p = null;
while ((p = getNextPacket()) != null) {
if (p.getSid() == sid && p.getSequenceNumber() >= sequenceNumber) {
nextPacket = p;
break;
}
}
}
/**
* Returns the next packet with the given SID (Stream ID), or null if no more packets remain. Any
* packets from other streams will be silently discarded.
*/
public OggPacket getNextPacketWithSid(int sid) throws IOException {
OggPacket p = null;
while ((p = getNextPacket()) != null) {
if (p.getSid() == sid) {
return p;
}
}
return null;
}
/**
* Writes all pending packets to the stream, with the last one containing the End Of Stream Flag,
* and then closes down.
*/
public void close() throws IOException {
if (buffer.size() > 0) {
buffer.get(buffer.size() - 1).setIsEOS();
} else {
OggPacket p = new OggPacket(new byte[0]);
p.setIsEOS();
bufferPacket(p);
}
flush();
closed = true;
}
