/*
* @(#)RTPDePacketizer.java 1.28 00/09/21
*
* Copyright 1998-2000 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package com.sun.media.codec.video.jpeg;
import javax.media.*;
import javax.media.Format;
import javax.media.format.VideoFormat;
import javax.media.format.JPEGFormat;
import java.awt.Dimension;
import com.sun.media.*;
import java.util.Vector;
/**
* This codec is a JPEG RTP depacketizer. It receives individual RTP
* buffers with a JPEG_RTP format. These buffers will be used to
* reconstruct a complete frame in the JPEG format. Once a frame is
* constructed, it is sent over to the next node i.e. a node capable of
* handling the JPEG format.
*/
public class RTPDePacketizer
{
private JPEGFrame currentFrame = null;
protected byte frameBuffer[] = null;
protected int sequenceNumber = 0;
protected int quality = 0;
protected int type = -1;
byte [] lastJFIFHeader = null;
int lastQuality = -2;
int lastType = -1;
int lastWidth = -1;
int lastHeight = -1;
public int getQuality() {
return quality;
}
public int getType() {
return type;
}
/**
* This method will reconstruct a JPEG frame from individual RTP
packets. The reconstruction process waits till all the packtes of
a frame are received and send this over to the decoder only if
all the frames were received. If a the first packet of a frame is
not received, all other packets belonging to this frame are
discarded.
*/
public int process(Buffer inBuffer, Buffer outBuffer)
{
// If we've been decoding a frame and packets from another
// frame has arrived, then we are missing the a few packets
// for the current frame. We'll discard the current frame.
if (currentFrame != null &&
inBuffer.getTimeStamp() != currentFrame.rtptimestamp) {
currentFrame = null;
}
// Check if this is the first packet from a new frame.
// The first packet has a framgment offset of 0.
if (getFragOffset((byte[])inBuffer.getData(), inBuffer.getOffset()) == 0) {
currentFrame = new JPEGFrame(this, inBuffer, (byte[])outBuffer.getData());
} else if (currentFrame != null) {
// This is a new packet for the current frame.
currentFrame.add(inBuffer, 0);
} else {
// If we don't have a current frame, then we are missing the
// first packet for this frame. We'll discard the current packet.
return PlugIn.OUTPUT_BUFFER_NOT_FILLED;
}
// If this is the last packet from this frame, we'll need to
// check if all the packets from this frame has been received.
if ((inBuffer.getFlags() & Buffer.FLAG_RTP_MARKER) !=0) {
if (currentFrame.gotAllPackets(inBuffer.getSequenceNumber())) {
currentFrame.completeTransfer(inBuffer, outBuffer);
currentFrame = null;
return PlugIn.BUFFER_PROCESSED_OK;
} else {
currentFrame = null;
return PlugIn.OUTPUT_BUFFER_NOT_FILLED;
}
}
return PlugIn.OUTPUT_BUFFER_NOT_FILLED;
}
public int getFragOffset(byte data[], int doff) {
// Fragment offset is the 2nd, 3rd & 4th byte of the JPEG Hdr.
int foff = 0;
foff |= (data[doff + 1] & 0xff) << 16;
foff |= (data[doff + 2] & 0xff) << 8;
foff |= (data[doff + 3] & 0xff);
return foff;
}
}
class JPEGFrame
{
public long rtptimestamp = -1;
/*the current seqnumber upto which the frame has been correctly
/*ordered*/
public int dataLength = 0;
private RTPDePacketizer depacketizer;
private int hdrOffset = 0; // size of the inserted JFIF header.
private long firstSeq, numPkts = 0;
final int FRAME_BUFFER_INITIAL_SIZE= 32000;
int lquantOffset = (
2 + // For FF D8 (SOI)
APP0.length +
2 + // For FF DB (DQT)
2 + // length
1 // tableNo
);
int cquantOffset = (
lquantOffset +
64 + // size of luma quant table
2 + // For FF DB (DQT)
2 + // length
1 // tableNo
);
public JPEGFrame( RTPDePacketizer depacketizer,
Buffer buffer,
byte frameBuffer[])
{
this.depacketizer= depacketizer;
firstSeq = buffer.getSequenceNumber();
if (depacketizer.frameBuffer == null) {
if (frameBuffer != null)
depacketizer.frameBuffer = frameBuffer;
else
depacketizer.frameBuffer = new byte[FRAME_BUFFER_INITIAL_SIZE];
}
rtptimestamp = buffer.getTimeStamp();
int extraskip = 0;
// If the first JPEG packet doesn't have a
// JFIF header, generate it.
// This is true for vic
if (!hasJFIFHeader(buffer))
extraskip = generateJFIFHeader(buffer);
add( buffer, extraskip );
}
public void add(Buffer buffer, int extraskip)
{
int chunkSize= buffer.getLength() - 8 - extraskip;
int foff = depacketizer.getFragOffset((byte[])buffer.getData(),
buffer.getOffset());
foff += hdrOffset; // If a JFIF header is inserted,
// we need to shift the data.
// 2 bytes is for the EOI marker
if (depacketizer.frameBuffer.length >= foff + chunkSize + 2)
{
System.arraycopy( (byte[])buffer.getData(),
buffer.getOffset() + 8 + extraskip, //RTP Hdr + JPEG Hdr
depacketizer.frameBuffer,
foff,
chunkSize);
dataLength+= chunkSize;
numPkts++;
}
else
{
// 2 bytes is for the EOI marker
increaseFrameBuffer( foff + chunkSize + 2);
add( buffer, extraskip);
}
}
public boolean gotAllPackets(long lastSeq) {
return (lastSeq - firstSeq + 1 == numPkts);
}
public void completeTransfer(Buffer inBuffer, Buffer outBuffer)
{
int offset = inBuffer.getOffset();
java.awt.Dimension d;
byte[] inBuff = (byte[])inBuffer.getData();
// height is the 8th byte in 8 bit pixels
int height = inBuff[offset + 7] & 0xff;
// width is the 7th byte in 8bit pixels
int width = inBuff[offset + 6] & 0xff;
// Q factor is the 6th byte
depacketizer.quality = inBuff[offset +5] & 0xff;
// type is the 5th byte
depacketizer.type = inBuff[offset + 4] & 0xff;
d = new java.awt.Dimension(width * 8, height *8);
inBuffer.setFormat(new VideoFormat(VideoFormat.JPEG,
d,
0,
inBuffer.getFormat().getDataType(),
Format.NOT_SPECIFIED));
if (!((depacketizer.frameBuffer[dataLength-2] == (byte) 0xff) &&
(depacketizer.frameBuffer[dataLength-1] == (byte) 0xd9))) {
depacketizer.frameBuffer[dataLength++] = (byte) 0xff;
depacketizer.frameBuffer[dataLength++] = (byte) 0xd9; // EOI
}
outBuffer.setData( depacketizer.frameBuffer);
outBuffer.setSequenceNumber(depacketizer.sequenceNumber++);
outBuffer.setLength( dataLength);
depacketizer.frameBuffer = null;
}
private void increaseFrameBuffer( int amount) {
//System.out.println( "JPEG Frame: increasing frame buffer by " + amount + " bytes.");
byte newFrameBuffer[]= new byte[ amount];
// Copy from the old buffer to the new buffer.
System.arraycopy( depacketizer.frameBuffer,
0,
newFrameBuffer,
0,
depacketizer.frameBuffer.length);
depacketizer.frameBuffer = newFrameBuffer;
}
private boolean hasJFIFHeader(Buffer buffer) {
byte [] data = (byte[]) buffer.getData();
int offset = buffer.getOffset();
if (! ((data[offset+8] & 0xFF) == 0xFF &&
(data[offset+9] & 0xFF) == 0xD8 ) )
return false;
else
return true;
}
private int generateJFIFHeader(Buffer buffer) {
int extraskip = 0;
byte [] data = (byte[]) buffer.getData();
int offset = buffer.getOffset();
int type = data[offset + 4] & 0xff;
// Q factor is the 6th byte
int quality = data[offset +5] & 0xff;
// width is the 7th byte in 8bit pixels
int width = data[offset + 6] & 0xff;
// height is the 8th byte in 8 bit pixels
int height = data[offset + 7] & 0xff;
if (quality == depacketizer.lastQuality &&
width == depacketizer.lastWidth &&
height == depacketizer.lastHeight &&
type == depacketizer.lastType) {
System.arraycopy(depacketizer.lastJFIFHeader,
0,
depacketizer.frameBuffer,
0,
depacketizer.lastJFIFHeader.length);
hdrOffset = depacketizer.lastJFIFHeader.length;
} else {
hdrOffset = makeHeaders(depacketizer.frameBuffer, 0,
type, quality, width, height);
depacketizer.lastJFIFHeader = new byte[hdrOffset];
System.arraycopy(depacketizer.frameBuffer, 0,
depacketizer.lastJFIFHeader, 0,
hdrOffset);
depacketizer.lastQuality = quality;
depacketizer.lastType = type;
depacketizer.lastWidth = width;
depacketizer.lastHeight = height;
}
if (quality >= 100) {
extraskip = 132;
System.arraycopy(data, offset+8+4,
depacketizer.frameBuffer, lquantOffset,
64);
System.arraycopy(data, offset+8+4+64,
depacketizer.frameBuffer, cquantOffset,
64);
}
dataLength += depacketizer.lastJFIFHeader.length;
return extraskip;
}
/**************************************************************
* JFIF HEADER GENERATION CODE
**************************************************************/
static final byte [] APP0 = { (byte) 0xFF, (byte) 0xE0, 0, 16,
0x4A, 0x46, 0x49, 0x46, 0, 1, 1,
0, 0, 1, 0, 1, 0, 0
};
/*
* Given an RTP/JPEG type code, q factor, width, and height,
* generate a frame and scan headers that can be prepended
* to the RTP/JPEG data payload to produce a JPEG compressed
* image in interchange format (except for possible trailing
* garbage and absence of an EOI marker to terminate the scan).
*/
private int makeHeaders(byte [] p, int offset,
int type, int q, int w, int h) {
int lqt[] = new int[64];
int cqt[] = new int[64];
byte samp;
/* convert from blocks to pixels */
w *= 8;
h *= 8;
makeQTables(q, lqt, cqt);
p[offset++] = (byte) 0xff;
p[offset++] = (byte) 0xd8; /* SOI */
// APP0 marker
for (int app = 0; app < APP0.length; app++) {
p[offset++] = APP0[app];
}
// TODO: pass q to makeQuantHeader. makeQuantHeader should
// just skip computing the quant header as the quant data
// is dynamic. Note that makeHeaders will be called only
// if quality, width, height or type changes between frames.
offset = makeQuantHeader(p, offset, lqt, 0);
offset = makeQuantHeader(p, offset, cqt, 1);
offset = makeHuffmanHeader(p, offset,
lum_dc_codelens, lum_dc_codelens.length,
lum_dc_symbols, lum_dc_symbols.length,
0, 0);
offset = makeHuffmanHeader(p, offset,
lum_ac_codelens, lum_ac_codelens.length,
lum_ac_symbols, lum_ac_symbols.length,
0, 1);
offset = makeHuffmanHeader(p, offset,
chm_dc_codelens, chm_dc_codelens.length,
chm_dc_symbols, chm_dc_symbols.length,
1, 0);
offset = makeHuffmanHeader(p, offset,
chm_ac_codelens, chm_ac_codelens.length,
chm_ac_symbols, chm_ac_symbols.length,
1, 1);
p[offset++] = (byte) 0xff;
p[offset++] = (byte) 0xc0; /* SOF */
p[offset++] = 0; /* length msb */
p[offset++] = 17; /* length lsb */
p[offset++] = 8; /* 8-bit precision */
p[offset++] = (byte) ((h >> 8) & 0xFF); /* height msb */
p[offset++] = (byte) ( h & 0xFF); /* height lsb */
p[offset++] = (byte) ((w >> 8) & 0xFF); /* width msb */
p[offset++] = (byte) ( w & 0xFF); /* width lsb */
p[offset++] = 3; /* number of components */
p[offset++] = 0; /* comp 0 */
if (type == JPEGFormat.DEC_444)
p[offset++] = 0x11; /* hsamp = 2, vsamp = 1 */
else if (type == JPEGFormat.DEC_420)
p[offset++] = 0x22; /* hsamp = 2, vsamp = 2 */
else
p[offset++] = 0x21;
p[offset++] = 0; /* quant table 0 */
p[offset++] = 1; /* comp 1 */
p[offset++] = 0x11;
p[offset++] = 1; /* quant table 1 */
p[offset++] = 2; /* comp 2 */
p[offset++] = 0x11;
p[offset++] = 1; /* quant table 1 */
p[offset++] = (byte) 0xff;
p[offset++] = (byte) 0xda; /* SOS */
p[offset++] = 0; /* length msb */
p[offset++] = 12; /* length lsb */
p[offset++] = 3; /* 3 components */
p[offset++] = 0; /* comp 0 */
p[offset++] = 0; /* huffman table 0 */
p[offset++] = 1; /* comp 1 */
p[offset++] = 0x11; /* huffman table 1 */
p[offset++] = 2; /* comp 2 */
p[offset++] = 0x11; /* huffman table 1 */
p[offset++] = 0; /* first DCT coeff */
p[offset++] = 63; /* last DCT coeff */
p[offset++] = 0; /* sucessive approx. */
return offset;
}
static int lum_dc_codelens[] = {
0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
};
static int lum_dc_symbols[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
};
static int lum_ac_codelens[] = {
0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d,
};
static int lum_ac_symbols[] = {
0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa
};
static int chm_dc_codelens[] = {
0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
};
static int chm_dc_symbols[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
};
static int chm_ac_codelens[] = {
0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77,
};
static int chm_ac_symbols[] = {
0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
0xf9, 0xfa
};
private int makeQuantHeader(byte [] p, int offset,
int [] qt, int tableNo) {
p[offset++] = (byte) 0xff;
p[offset++] = (byte) 0xdb; /* DQT */
p[offset++] = 0; /* length msb */
p[offset++] = 67; /* length lsb */
p[offset++] = (byte) tableNo;
for (int i = 0; i < 64; i++) {
p[offset++] = (byte) qt[i];
}
return offset;
}
private int makeHuffmanHeader(byte [] p, int offset,
int [] codelens, int ncodes,
int [] symbols, int nsymbols,
int tableNo, int tableClass) {
int i;
p[offset++] = (byte) 0xff;
p[offset++] = (byte) 0xc4; /* DHT */
p[offset++] = 0; /* length msb */
p[offset++] = (byte) (3 + ncodes + nsymbols); /* length lsb */
p[offset++] = (byte) ((tableClass << 4) | tableNo);
for (i = 0; i < ncodes; i++)
p[offset++] = (byte) codelens[i];
for (i = 0; i < nsymbols; i++)
p[offset++] = (byte) symbols[i];
return offset;
}
static int ZigZag[] = {
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36,
29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63
};
/*
* Table K.1 from JPEG spec.
*/
static int jpeg_luma_quantizer[] = {
16, 11, 10, 16, 24, 40, 51, 61,
12, 12, 14, 19, 26, 58, 60, 55,
14, 13, 16, 24, 40, 57, 69, 56,
14, 17, 22, 29, 51, 87, 80, 62,
18, 22, 37, 56, 68, 109, 103, 77,
24, 35, 55, 64, 81, 104, 113, 92,
49, 64, 78, 87, 103, 121, 120, 101,
72, 92, 95, 98, 112, 100, 103, 99
};
/*
* Table K.2 from JPEG spec.
*/
static int jpeg_chroma_quantizer[] = {
17, 18, 24, 47, 99, 99, 99, 99,
18, 21, 26, 66, 99, 99, 99, 99,
24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99
};
/*
* Call MakeTables with the Q factor and two int[64] return arrays
*/
private void makeQTables(int q, int [] lum_q, int [] chr_q) {
int i;
int factor = q;
if (q < 1) factor = 1;
if (q > 99) factor = 99;
if (q < 50)
q = 5000 / factor;
else
q = 200 - factor*2;
for (i = 0; i < 64; i++) {
int lq = (jpeg_luma_quantizer[ZigZag[i]] * q + 50) / 100;
int cq = (jpeg_chroma_quantizer[ZigZag[i]] * q + 50) / 100;
/* Limit the quantizers to 1 <= q <= 255 */
if (lq < 1)
lq = 1;
else if (lq > 255)
lq = 255;
lum_q[i] = lq;
if (cq < 1)
cq = 1;
else if (cq > 255)
cq = 255;
chr_q[i] = cq;
// System.err.println("Values = " + lum_q[i] + " " + chr_q[i]);
}
}
}
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