/* $Id: DePacketizer.java,v 1.1 2005/12/28 15:58:18 jsanpedro Exp $ */
/**
* Neon Media MPEG-4 Video
* RTP De-Packetizer
* @author Scott Hays
* @created 2005/08/26
* Copyright (c) 2005 Neon Advanced Technologies Co., Ltd. All rights reserved.
*
* The Neon MPEG-4 Video RTP DePacketizer is free software; you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* The Neon MPEG-4 Video RTP DePacketizer is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTIBILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*/
package com.neon.media.codec.video.mp4v;
import com.neon.util.RTP;
import com.ibm.media.codec.video.VideoCodec;
import java.awt.Dimension;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.io.IOException;
import java.util.Vector;
import javax.media.Buffer;
import javax.media.Format;
import javax.media.PlugIn;
import javax.media.format.VideoFormat;
public class DePacketizer extends VideoCodec {
private static String IN_ENCODING = "MP4V/RTP";
private static String OUT_ENCODING = "MP4V";
private static final int DEF_WIDTH = 352;
private static final int DEF_HEIGHT = 240;
private boolean firstFrame = true;
private MP4VFrame currentFrame = null;
private short seqNum = 0;
private final int FRAME_BUFFER_INITIAL_SIZE = 8*1024; // 8KB
/* //DEBUG
private File dumpFile;
private File packDumpFile;
private File completeDFile;
private File logFile;
private FileOutputStream dumpOut;
private FileOutputStream packDumpOut;
private FileOutputStream completeDOut;
private FileOutputStream logOut;
private PrintStream log;
*/ //DEBUG
private static boolean isFrameStart(Buffer buffer) {
Object data = buffer.getData();
byte[] payload = (byte[])data;
int offset = buffer.getOffset();
return isFrameStart(payload, offset);
}
// starts with VS, VO, VOL, or VOP start code
private static boolean isFrameStart(byte[] payload, int offset) {
int firstBytes = (payload[offset] & 0xff) << 16 | (payload[offset+1] & 0xff) << 8 | (payload[offset+2] & 0xff);
// first 3 bytes of a system code
return firstBytes == 0x000001;
}
// should at least have VOL header (but should really have VS and VO as well)
private static boolean canStartStream(Buffer buffer) {
byte[] payload = (byte[])buffer.getData();
int offset = buffer.getOffset();
//System.err.println("mp4v.DePacketizer: offset = " + offset);
int length = 32; // VOL SHOULD be in the first 32 bytes so don't bother scanning entire buffer
if (buffer.getLength() <= length) return false;
boolean keep_looking = true;
int currentCode = (payload[offset] & 0xff) << 24 | (payload[offset+1] & 0xff) << 16 | (payload[offset+2] & 0xff) << 8 | (payload[offset+3] & 0xff);
for (int i=4; i < length; i++) {
if ((currentCode & 0xfffffff0) == 0x00000120) return true;
if (currentCode == 0x000001b0) System.err.println("MP4VFrame.canStartStream: frame has VS header");
if (currentCode == 0x000001b5) System.err.println("MP4VFrame.canStartStream: frame has VO header");
//System.err.println("MP4VFrame.canStartStream:0x" + Integer.toHexString(currentCode));
currentCode = (currentCode << 8) | (payload[offset+i] & 0xff);
}
return false; // VOL not found
}
public DePacketizer() {
System.err.println(this.getClass().getName() + " constructor called.");
PLUGIN_NAME = "Neon MP4V RTP DePacketizer";
inputFormats = supportedInputFormats = new VideoFormat[] { new VideoFormat(IN_ENCODING), new VideoFormat("MP4V-ES"), new VideoFormat("MP4V-ES/90000") };
defaultOutputFormats = new VideoFormat[] { new VideoFormat(OUT_ENCODING) };
/* //DEBUG
try {
dumpFile = new File("dump.m4v");
packDumpFile = new File("packdump.m4v");
completeDFile = new File("completedump.m4v");
logFile = new File("nmp.log");
dumpOut = new FileOutputStream(dumpFile);
packDumpOut = new FileOutputStream(packDumpFile);
completeDOut = new FileOutputStream(completeDFile);
logOut = new FileOutputStream(logFile);
log = new PrintStream(logOut);
} catch (FileNotFoundException e) {
System.err.println("mp4v.DePacketizer: failed to open dump files: " + e.getMessage());
e.printStackTrace();
}
*/ //DEBUG
}
public Format[] getSupportedOutputFormats(Format f) {
System.err.println("mp4v.DePacketizer: getting for f = " + f);
if (f == null) return defaultOutputFormats;
else if (f.getEncoding().equalsIgnoreCase(IN_ENCODING)) {
if (f instanceof VideoFormat) {
VideoFormat vf = (VideoFormat)f;
VideoFormat supOutFmt = new VideoFormat(OUT_ENCODING, vf.getSize() == null ? new Dimension(DEF_WIDTH, DEF_HEIGHT):vf.getSize(), vf.getMaxDataLength(), Format.byteArray, vf.getFrameRate());
System.err.println("mp4v.DePacketizer: supported Output Format = " + supOutFmt);
return new Format[] { supOutFmt };
} else return new Format[] {new VideoFormat(OUT_ENCODING, new Dimension(DEF_WIDTH, DEF_HEIGHT), Format.NOT_SPECIFIED, Format.byteArray, Format.NOT_SPECIFIED) };
}
System.err.println("mp4v.DePacketizer: getSupportedOutputFormats f = " + f);
return new Format[0];
}
public String getName() {
return PLUGIN_NAME;
}
public Format setOutputFormat(Format f) {
VideoFormat vf = (VideoFormat)f;
if (!f.getEncoding().equalsIgnoreCase(OUT_ENCODING)) {
System.err.println("mp4v.DePacketizer: setOutputFormat received unsupported encoding: " + f.getEncoding());
return null;
}
System.err.println("mp4v.DePacketizer: setOutputFormat received format with size: " + vf.getSize());
outputFormat = new VideoFormat(OUT_ENCODING, vf.getSize() == null ? new Dimension(DEF_WIDTH, DEF_HEIGHT):vf.getSize(), vf.getMaxDataLength(), Format.byteArray, vf.getFrameRate());
return outputFormat;
}
public synchronized int process(Buffer inBuffer, Buffer outBuffer) {
if (firstFrame && !(inBuffer.getData() instanceof byte[])) { // assume that if the first inBuffers are byte arrays, all are
System.err.println("MP4VFrame.isFrameStart: payload is not byte[]");
return OUTPUT_BUFFER_NOT_FILLED;
}
//DEBUG
//HACK:Sun RTP RECEIVE BUG
// Sun RTP seems to require regular I/O, otherwise it seldom delivers received packets
System.err.println("mp4v.DePacketizer: process() inBuffer.getLength() = " + inBuffer.getLength());
//DEBUG
if (isEOM(inBuffer)) {
propagateEOM(outBuffer);
return BUFFER_PROCESSED_OK;
}
if (inBuffer.isDiscard()) {
updateOutput(outBuffer, outputFormat, 0, 0);
outBuffer.setDiscard(true);
return OUTPUT_BUFFER_NOT_FILLED;
}
/* //DEBUG
try {
completeDOut.write((byte[])inBuffer.getData(), inBuffer.getOffset(), inBuffer.getLength());
} catch (IOException e) {
System.err.println("mp4v.DePacketizer: couldn't write to complete dump: " + e.getMessage());
e.printStackTrace();
}
*/ //DEBUG
//System.err.println("mp4v.DePacketizer: process packet");
// lost RTP fragment packet(s) so drop frame
if (currentFrame != null && inBuffer.getTimeStamp() != currentFrame.getTimeStamp()) {
System.err.println("mp4v.DePacketizer: DROP FRAME:timestamp mismatch: got(" + inBuffer.getTimeStamp() + ") on packet " + inBuffer.getSequenceNumber() + ", expected(" + currentFrame.getTimeStamp() + ")");
currentFrame = null;
// frameBuffer.clear();
}
// check to see if packet is first of a frame
if (currentFrame == null && isFrameStart(inBuffer)) {
// ensure first frame given to encoder has needed configuration information
if (firstFrame && !canStartStream(inBuffer)) return PlugIn.OUTPUT_BUFFER_NOT_FILLED;
if (firstFrame) System.err.println(">>>> mp4v.DePacketizer: START STREAM");
currentFrame = new MP4VFrame(inBuffer);
firstFrame = false;
} else {
if (currentFrame == null) {
System.err.println("^^^^mp4v.DePacketizer: DROP PACKET " + inBuffer.getSequenceNumber() + ": no current frame and packet cannot start frame.");
return PlugIn.OUTPUT_BUFFER_NOT_FILLED;
}
// System.err.println("mp4v.DePacketizer: adding packet to frame");
currentFrame.add(inBuffer);
}
// check to see if entire frame should now have been received
if ((inBuffer.getFlags() & Buffer.FLAG_RTP_MARKER) != 0) {
if (!currentFrame.isMissingFragments()) {
completeTransfer(inBuffer, outBuffer);
currentFrame = null;
// System.err.println("____mp4v.DePacketizer: delivering frame._____");
return PlugIn.BUFFER_PROCESSED_OK;
} else {
// frame incomplete and last packet received, so drop
System.err.println("&&&&mp4v.DePacketizer: DROP FRAME:missing fragments");
currentFrame = null;
return PlugIn.OUTPUT_BUFFER_NOT_FILLED;
}
}
// System.err.println("mp4v.DePacketizer: output buffer not filled");
return PlugIn.OUTPUT_BUFFER_NOT_FILLED;
}
private void completeTransfer(Buffer inBuffer, Buffer outBuffer) {
// System.err.println("mp4v.DePacketizer: completeTransfer called");
if (outputFormat == null) System.err.println("mp4v.DePacketizer: outputFormat NULL!!!!!!!!!!");
//SANITY CHECK
if (!isFrameStart(currentFrame.getFrameBuffer(), 0)) {
System.err.println("((((((mp4v.DePacketizer: FRAME CORRUPTED!!))))))");
System.exit(1);
}
outBuffer.setFormat(outputFormat);
outBuffer.setData(currentFrame.getFrameBuffer());
outBuffer.setOffset(0);
outBuffer.setDuration((long)(((VideoFormat)outputFormat).getFrameRate() + 0.5));
outBuffer.setSequenceNumber(seqNum++); //FIXME roll over??
outBuffer.setTimeStamp(currentFrame.getTimeStamp());
outBuffer.setLength(currentFrame.getDataLength());
/* //DEBUG
try {
dumpOut.write(currentFrame.getFrameBuffer(), 0, currentFrame.getDataLength());
} catch (Exception e) {
System.err.println("mp4v.DePacketizer: failed to write frame: " + e.getMessage());
e.printStackTrace();
}
*/ //DEBUG
currentFrame = null;
}
private class MP4VFrame {
private long firstSequenceNumber = 0, lastSequenceNumber = 0;
private int numPackets = 0;
private Buffer frameBuffer = null;
private Vector outOfOrderFragments;
public MP4VFrame(Buffer inBuffer) {
firstSequenceNumber = inBuffer.getSequenceNumber();
lastSequenceNumber = RTP.previousSequenceNumber(firstSequenceNumber);
numPackets++;
frameBuffer = new Buffer();
frameBuffer.setData(new byte[FRAME_BUFFER_INITIAL_SIZE]);
frameBuffer.setOffset(0);
frameBuffer.setLength(0);
frameBuffer.setTimeStamp(inBuffer.getTimeStamp());
outOfOrderFragments = new Vector();
add(inBuffer);
}
public long getTimeStamp() {
return frameBuffer.getTimeStamp();
}
public boolean isMissingFragments() {
return outOfOrderFragments.size() != 0;
}
public void add(Buffer buffer) {
if (!RTP.areConsecutiveSequenceNumbers(lastSequenceNumber, buffer.getSequenceNumber())) {
if (RTP.compareSequenceNumbers(firstSequenceNumber, buffer.getSequenceNumber()) < 0) { // ensure sequence number isn't bizarre
System.err.println("####mp4v.DePacketizer$MP4VFrame: saving out of order fragment: " + lastSequenceNumber + " not conseq with " + buffer.getSequenceNumber());
saveOutOfOrderFragment(buffer);
} else System.err.println("$$$$$mp4v.DePacketizer$MP4VFrame: strange fragment dropped: " + buffer.getSequenceNumber());
return;
}
// System.err.println("mp4v.DePacketizer$MP4VFrame: adding buffer " + buffer.getSequenceNumber());
int old_len = frameBuffer.getLength();
frameBuffer.setData(validateByteArraySize(frameBuffer, frameBuffer.getLength()+buffer.getLength()));
if (old_len < frameBuffer.getLength()) System.err.println("++++mp4v.DePacketizer: had to expand frameBuffer by " + (frameBuffer.getLength() - old_len));
System.arraycopy((byte[])buffer.getData(), buffer.getOffset(), (byte[])frameBuffer.getData(), frameBuffer.getLength(), buffer.getLength());
frameBuffer.setLength(frameBuffer.getLength()+buffer.getLength());
numPackets++;
lastSequenceNumber = buffer.getSequenceNumber();
addFromQueuedFragments();
//DEBUG
try {
// packDumpOut.write((byte[])buffer.getData(), buffer.getOffset(), buffer.getLength());
} catch (Exception e) {
System.err.println("mp4v.DePacketizer: failed to write packet dump: " + e.getMessage());
e.printStackTrace();
}
//DEBUG
}
public byte[] getFrameBuffer() {
return (byte[])frameBuffer.getData();
}
public int getDataLength() {
return frameBuffer.getLength();
}
private void addFromQueuedFragments() {
if (outOfOrderFragments.size() <= 0) return;
Buffer storedBuf = (Buffer)outOfOrderFragments.get(0);
if (RTP.areConsecutiveSequenceNumbers(lastSequenceNumber, storedBuf.getSequenceNumber())) {
outOfOrderFragments.remove(0);
add(storedBuf);
}
}
private void saveOutOfOrderFragment(Buffer buffer) {
// System.err.println("mp4v.DePacketizer$MP4VFrame: saving out of order packet");
for (int i=0; i < outOfOrderFragments.size(); i++) {
Buffer storedBuf = (Buffer)outOfOrderFragments.get(i);
int cmpval = RTP.compareSequenceNumbers(buffer.getSequenceNumber(), storedBuf.getSequenceNumber());
if (cmpval < 0) outOfOrderFragments.add(i, buffer); // new buffer goes before stored
else if (cmpval > 0) continue; // new buffer goes after stored
else return; // cmpval == 0 -> duplicate, so drop
}
outOfOrderFragments.add(buffer);
}
}
}
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