466 lines
16 KiB
C++
Executable File
466 lines
16 KiB
C++
Executable File
/**********
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This library is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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**********/
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// "liveMedia"
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// Copyright (c) 1996-2016 Live Networks, Inc. All rights reserved.
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// JPEG Video (RFC 2435) RTP Sources
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// Implementation
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#include "JPEGVideoRTPSource.hh"
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////////// JPEGBufferedPacket and JPEGBufferedPacketFactory //////////
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class JPEGBufferedPacket: public BufferedPacket {
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public:
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Boolean completesFrame;
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private:
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// Redefined virtual functions:
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virtual void reset();
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virtual unsigned nextEnclosedFrameSize(unsigned char*& framePtr,
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unsigned dataSize);
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};
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class JPEGBufferedPacketFactory: public BufferedPacketFactory {
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private: // redefined virtual functions
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virtual BufferedPacket* createNewPacket(MultiFramedRTPSource* ourSource);
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};
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////////// JPEGVideoRTPSource implementation //////////
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#define BYTE unsigned char
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#define WORD unsigned
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#define DWORD unsigned long
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JPEGVideoRTPSource*
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JPEGVideoRTPSource::createNew(UsageEnvironment& env, Groupsock* RTPgs,
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unsigned char rtpPayloadFormat,
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unsigned rtpTimestampFrequency,
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unsigned defaultWidth, unsigned defaultHeight) {
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return new JPEGVideoRTPSource(env, RTPgs, rtpPayloadFormat,
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rtpTimestampFrequency, defaultWidth, defaultHeight);
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}
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JPEGVideoRTPSource::JPEGVideoRTPSource(UsageEnvironment& env,
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Groupsock* RTPgs,
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unsigned char rtpPayloadFormat,
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unsigned rtpTimestampFrequency,
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unsigned defaultWidth, unsigned defaultHeight)
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: MultiFramedRTPSource(env, RTPgs,
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rtpPayloadFormat, rtpTimestampFrequency,
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new JPEGBufferedPacketFactory),
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fDefaultWidth(defaultWidth), fDefaultHeight(defaultHeight) {
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}
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JPEGVideoRTPSource::~JPEGVideoRTPSource() {
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}
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enum {
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MARKER_SOF0 = 0xc0, // start-of-frame, baseline scan
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MARKER_SOI = 0xd8, // start of image
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MARKER_EOI = 0xd9, // end of image
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MARKER_SOS = 0xda, // start of scan
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MARKER_DRI = 0xdd, // restart interval
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MARKER_DQT = 0xdb, // define quantization tables
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MARKER_DHT = 0xc4, // huffman tables
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MARKER_APP_FIRST = 0xe0,
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MARKER_APP_LAST = 0xef,
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MARKER_COMMENT = 0xfe,
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};
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static unsigned char const lum_dc_codelens[] = {
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0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
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};
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static unsigned char const lum_dc_symbols[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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};
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static unsigned char const lum_ac_codelens[] = {
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0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d,
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};
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static unsigned char const lum_ac_symbols[] = {
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0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa,
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};
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static unsigned char const chm_dc_codelens[] = {
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0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
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};
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static unsigned char const chm_dc_symbols[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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};
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static unsigned char const chm_ac_codelens[] = {
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0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77,
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};
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static unsigned char const chm_ac_symbols[] = {
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0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa,
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};
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static void createHuffmanHeader(unsigned char*& p,
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unsigned char const* codelens,
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int ncodes,
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unsigned char const* symbols,
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int nsymbols,
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int tableNo, int tableClass) {
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*p++ = 0xff; *p++ = MARKER_DHT;
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*p++ = 0; /* length msb */
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*p++ = 3 + ncodes + nsymbols; /* length lsb */
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*p++ = (tableClass << 4) | tableNo;
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memcpy(p, codelens, ncodes);
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p += ncodes;
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memcpy(p, symbols, nsymbols);
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p += nsymbols;
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}
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static unsigned computeJPEGHeaderSize(unsigned qtlen, unsigned dri) {
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unsigned qtlen_half = qtlen/2; // in case qtlen is odd; shouldn't happen
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qtlen = qtlen_half*2;
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unsigned numQtables = qtlen > 64 ? 2 : 1;
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return 485 + numQtables*5 + qtlen + (dri > 0 ? 6 : 0);
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}
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static void createJPEGHeader(unsigned char* buf, unsigned type,
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unsigned w, unsigned h,
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unsigned char const* qtables, unsigned qtlen,
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unsigned dri) {
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unsigned char *ptr = buf;
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unsigned numQtables = qtlen > 64 ? 2 : 1;
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// MARKER_SOI:
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*ptr++ = 0xFF; *ptr++ = MARKER_SOI;
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// MARKER_APP_FIRST:
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*ptr++ = 0xFF; *ptr++ = MARKER_APP_FIRST;
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*ptr++ = 0x00; *ptr++ = 0x10; // size of chunk
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*ptr++ = 'J'; *ptr++ = 'F'; *ptr++ = 'I'; *ptr++ = 'F'; *ptr++ = 0x00;
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*ptr++ = 0x01; *ptr++ = 0x01; // JFIF format version (1.1)
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*ptr++ = 0x00; // no units
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*ptr++ = 0x00; *ptr++ = 0x01; // Horizontal pixel aspect ratio
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*ptr++ = 0x00; *ptr++ = 0x01; // Vertical pixel aspect ratio
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*ptr++ = 0x00; *ptr++ = 0x00; // no thumbnail
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// MARKER_DRI:
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if (dri > 0) {
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*ptr++ = 0xFF; *ptr++ = MARKER_DRI;
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*ptr++ = 0x00; *ptr++ = 0x04; // size of chunk
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*ptr++ = (BYTE)(dri >> 8); *ptr++ = (BYTE)(dri); // restart interval
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}
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// MARKER_DQT (luma):
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unsigned tableSize = numQtables == 1 ? qtlen : qtlen/2;
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*ptr++ = 0xFF; *ptr++ = MARKER_DQT;
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*ptr++ = 0x00; *ptr++ = tableSize + 3; // size of chunk
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*ptr++ = 0x00; // precision(0), table id(0)
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memcpy(ptr, qtables, tableSize);
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qtables += tableSize;
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ptr += tableSize;
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if (numQtables > 1) {
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unsigned tableSize = qtlen - qtlen/2;
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// MARKER_DQT (chroma):
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*ptr++ = 0xFF; *ptr++ = MARKER_DQT;
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*ptr++ = 0x00; *ptr++ = tableSize + 3; // size of chunk
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*ptr++ = 0x01; // precision(0), table id(1)
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memcpy(ptr, qtables, tableSize);
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qtables += tableSize;
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ptr += tableSize;
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}
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// MARKER_SOF0:
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*ptr++ = 0xFF; *ptr++ = MARKER_SOF0;
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*ptr++ = 0x00; *ptr++ = 0x11; // size of chunk
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*ptr++ = 0x08; // sample precision
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*ptr++ = (BYTE)(h >> 8);
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*ptr++ = (BYTE)(h); // number of lines (must be a multiple of 8)
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*ptr++ = (BYTE)(w >> 8);
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*ptr++ = (BYTE)(w); // number of columns (must be a multiple of 8)
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*ptr++ = 0x03; // number of components
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*ptr++ = 0x01; // id of component
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*ptr++ = type ? 0x22 : 0x21; // sampling ratio (h,v)
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*ptr++ = 0x00; // quant table id
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*ptr++ = 0x02; // id of component
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*ptr++ = 0x11; // sampling ratio (h,v)
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*ptr++ = numQtables == 1 ? 0x00 : 0x01; // quant table id
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*ptr++ = 0x03; // id of component
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*ptr++ = 0x11; // sampling ratio (h,v)
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*ptr++ = numQtables == 1 ? 0x00 : 0x01; // quant table id
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createHuffmanHeader(ptr, lum_dc_codelens, sizeof lum_dc_codelens,
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lum_dc_symbols, sizeof lum_dc_symbols, 0, 0);
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createHuffmanHeader(ptr, lum_ac_codelens, sizeof lum_ac_codelens,
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lum_ac_symbols, sizeof lum_ac_symbols, 0, 1);
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createHuffmanHeader(ptr, chm_dc_codelens, sizeof chm_dc_codelens,
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chm_dc_symbols, sizeof chm_dc_symbols, 1, 0);
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createHuffmanHeader(ptr, chm_ac_codelens, sizeof chm_ac_codelens,
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chm_ac_symbols, sizeof chm_ac_symbols, 1, 1);
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// MARKER_SOS:
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*ptr++ = 0xFF; *ptr++ = MARKER_SOS;
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*ptr++ = 0x00; *ptr++ = 0x0C; // size of chunk
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*ptr++ = 0x03; // number of components
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*ptr++ = 0x01; // id of component
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*ptr++ = 0x00; // huffman table id (DC, AC)
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*ptr++ = 0x02; // id of component
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*ptr++ = 0x11; // huffman table id (DC, AC)
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*ptr++ = 0x03; // id of component
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*ptr++ = 0x11; // huffman table id (DC, AC)
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*ptr++ = 0x00; // start of spectral
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*ptr++ = 0x3F; // end of spectral
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*ptr++ = 0x00; // successive approximation bit position (high, low)
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}
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// The default 'luma' and 'chroma' quantizer tables, in zigzag order:
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static unsigned char const defaultQuantizers[128] = {
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// luma table:
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16, 11, 12, 14, 12, 10, 16, 14,
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13, 14, 18, 17, 16, 19, 24, 40,
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26, 24, 22, 22, 24, 49, 35, 37,
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29, 40, 58, 51, 61, 60, 57, 51,
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56, 55, 64, 72, 92, 78, 64, 68,
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87, 69, 55, 56, 80, 109, 81, 87,
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95, 98, 103, 104, 103, 62, 77, 113,
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121, 112, 100, 120, 92, 101, 103, 99,
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// chroma table:
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17, 18, 18, 24, 21, 24, 47, 26,
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26, 47, 99, 66, 56, 66, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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};
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static void makeDefaultQtables(unsigned char* resultTables, unsigned Q) {
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int factor = Q;
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int q;
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if (Q < 1) factor = 1;
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else if (Q > 99) factor = 99;
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if (Q < 50) {
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q = 5000 / factor;
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} else {
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q = 200 - factor*2;
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}
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for (int i = 0; i < 128; ++i) {
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int newVal = (defaultQuantizers[i]*q + 50)/100;
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if (newVal < 1) newVal = 1;
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else if (newVal > 255) newVal = 255;
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resultTables[i] = newVal;
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}
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}
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Boolean JPEGVideoRTPSource
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::processSpecialHeader(BufferedPacket* packet,
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unsigned& resultSpecialHeaderSize) {
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unsigned char* headerStart = packet->data();
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unsigned packetSize = packet->dataSize();
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unsigned char* qtables = NULL;
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unsigned qtlen = 0;
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unsigned dri = 0;
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// There's at least 8-byte video-specific header
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type-specific | Fragment Offset |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Q | Width | Height |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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if (packetSize < 8) return False;
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resultSpecialHeaderSize = 8;
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unsigned Offset = (unsigned)((DWORD)headerStart[1] << 16 | (DWORD)headerStart[2] << 8 | (DWORD)headerStart[3]);
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unsigned Type = (unsigned)headerStart[4];
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unsigned type = Type & 1;
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unsigned Q = (unsigned)headerStart[5];
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unsigned width = (unsigned)headerStart[6] * 8;
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unsigned height = (unsigned)headerStart[7] * 8;
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if ((width == 0 || height == 0) && fDefaultWidth != 0 && fDefaultHeight != 0) {
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// Use the default width and height parameters instead:
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width = fDefaultWidth;
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height = fDefaultHeight;
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}
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if (width == 0) width = 256*8; // special case
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if (height == 0) height = 256*8; // special case
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if (Type > 63) {
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// Restart Marker header present
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Restart Interval |F|L| Restart Count |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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if (packetSize < resultSpecialHeaderSize + 4) return False;
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unsigned RestartInterval = (unsigned)((WORD)headerStart[resultSpecialHeaderSize] << 8 | (WORD)headerStart[resultSpecialHeaderSize + 1]);
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dri = RestartInterval;
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resultSpecialHeaderSize += 4;
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}
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if (Offset == 0) {
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if (Q > 127) {
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// Quantization Table header present
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| MBZ | Precision | Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Quantization Table Data |
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| ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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if (packetSize < resultSpecialHeaderSize + 4) return False;
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unsigned MBZ = (unsigned)headerStart[resultSpecialHeaderSize];
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if (MBZ == 0) {
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// unsigned Precision = (unsigned)headerStart[resultSpecialHeaderSize + 1];
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unsigned Length = (unsigned)((WORD)headerStart[resultSpecialHeaderSize + 2] << 8 | (WORD)headerStart[resultSpecialHeaderSize + 3]);
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//ASSERT(Length == 128);
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resultSpecialHeaderSize += 4;
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if (packetSize < resultSpecialHeaderSize + Length) return False;
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qtlen = Length;
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qtables = &headerStart[resultSpecialHeaderSize];
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resultSpecialHeaderSize += Length;
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}
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}
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}
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// If this is the first (or only) fragment of a JPEG frame, then we need
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// to synthesize a JPEG header, and prepend it to the incoming data.
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// Hack: We can do this because we allowed space for it in
|
|
// our special "JPEGBufferedPacket" subclass. We also adjust
|
|
// "resultSpecialHeaderSize" to compensate for this, by subtracting
|
|
// the size of the synthesized header. Note that this will cause
|
|
// "resultSpecialHeaderSize" to become negative, but the code that called
|
|
// us (in "MultiFramedRTPSource") will handle this properly.
|
|
if (Offset == 0) {
|
|
unsigned char newQtables[128];
|
|
if (qtlen == 0) {
|
|
// A quantization table was not present in the RTP JPEG header,
|
|
// so use the default tables, scaled according to the "Q" factor:
|
|
makeDefaultQtables(newQtables, Q);
|
|
qtables = newQtables;
|
|
qtlen = sizeof newQtables;
|
|
}
|
|
|
|
unsigned hdrlen = computeJPEGHeaderSize(qtlen, dri);
|
|
resultSpecialHeaderSize -= hdrlen; // goes negative
|
|
headerStart += (int)resultSpecialHeaderSize; // goes backward
|
|
createJPEGHeader(headerStart, type, width, height, qtables, qtlen, dri);
|
|
}
|
|
|
|
fCurrentPacketBeginsFrame = (Offset == 0);
|
|
|
|
// The RTP "M" (marker) bit indicates the last fragment of a frame:
|
|
((JPEGBufferedPacket*)packet)->completesFrame
|
|
= fCurrentPacketCompletesFrame = packet->rtpMarkerBit();
|
|
|
|
return True;
|
|
}
|
|
|
|
char const* JPEGVideoRTPSource::MIMEtype() const {
|
|
return "video/JPEG";
|
|
}
|
|
|
|
////////// JPEGBufferedPacket and JPEGBufferedPacketFactory implementation
|
|
|
|
void JPEGBufferedPacket::reset() {
|
|
BufferedPacket::reset();
|
|
|
|
// Move our "fHead" and "fTail" forward, to allow space for a synthesized
|
|
// JPEG header to precede the RTP data that comes in over the network.
|
|
unsigned offset = MAX_JPEG_HEADER_SIZE;
|
|
if (offset > fPacketSize) offset = fPacketSize; // shouldn't happen
|
|
fHead = fTail = offset;
|
|
}
|
|
|
|
unsigned JPEGBufferedPacket
|
|
::nextEnclosedFrameSize(unsigned char*& framePtr, unsigned dataSize) {
|
|
// Normally, the enclosed frame size is just "dataSize". If, however,
|
|
// the frame does not end with the "EOI" marker, then add this now:
|
|
if (completesFrame && dataSize >= 2 &&
|
|
!(framePtr[dataSize-2] == 0xFF && framePtr[dataSize-1] == MARKER_EOI)) {
|
|
framePtr[dataSize++] = 0xFF;
|
|
framePtr[dataSize++] = MARKER_EOI;
|
|
}
|
|
return dataSize;
|
|
}
|
|
|
|
BufferedPacket* JPEGBufferedPacketFactory
|
|
::createNewPacket(MultiFramedRTPSource* /*ourSource*/) {
|
|
return new JPEGBufferedPacket;
|
|
}
|