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mpeg2wrap.cpp
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/***************************************************************************
mpeg2wrap.cpp - description
-------------------
begin : Son Nov 16 23:25:00 CET 2003
copyright : (C) 2003/2004 by theNoad #709GRW
email : [email protected]
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
/*
this is the wrapper to the mpeg2-library (libmpeg2)
the demuxer is based on the original demuxer from mpeg2dec.c
Copyright (C) 2000-2003 Michel Lespinasse <[email protected]>
Copyright (C) 1999-2000 Aaron Holtzman <[email protected]>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <getopt.h>
#ifdef HAVE_IO_H
#include <fcntl.h>
#include <io.h>
#endif
#include <inttypes.h>
#include "mpeg2wrap.h"
#include "tools.h"
#include "audiotools.h"
#ifdef VNOAD
#define DECODE_AUDIO
#define PLAY_AUDIO
#endif
mpeg2dec_t *mpeg2dec = NULL;
int demux_pid = 0;
int demux_track = 0;
int audio_demux_track = 0x80;
int iFrameDisplayed = 0;
bool iframeDisplay = false;
bool streamHasAC3 = false;
int ac3mode = 0;
bool ignorevideo = false;
bool dodumpts=false;
bool isOnlinescan=false;
//bool doConversion = false;
cbfunc current_cbf = NULL;
audiocbfunc current_audiocbf = NULL;
playaudiocbfunc current_playaudiocbf = NULL;
//conversionCallback conv_cbf = NULL;
int iCurrentDecodedFrame = 0;
uint_64 ac3pts = 0;
uint_64 audiopts = 0;
uint_64 videopts = 0;
typedef struct _frmsize
{
uint_16 bit_rate;
uint_16 frame_size[3];
} frmsize_t;
static const frmsize_t frmsizecod_tbl[64] = {
{ 32 ,{64 ,69 ,96 } }, { 32 ,{64 ,70 ,96 } },
{ 40 ,{80 ,87 ,120 } }, { 40 ,{80 ,88 ,120 } },
{ 48 ,{96 ,104 ,144 } }, { 48 ,{96 ,105 ,144 } },
{ 56 ,{112 ,121 ,168 } }, { 56 ,{112 ,122 ,168 } },
{ 64 ,{128 ,139 ,192 } }, { 64 ,{128 ,140 ,192 } },
{ 80 ,{160 ,174 ,240 } }, { 80 ,{160 ,175 ,240 } },
{ 96 ,{192 ,208 ,288 } }, { 96 ,{192 ,209 ,288 } },
{ 112 ,{224 ,243 ,336 } }, { 112 ,{224 ,244 ,336 } },
{ 128 ,{256 ,278 ,384 } }, { 128 ,{256 ,279 ,384 } },
{ 160 ,{320 ,348 ,480 } }, { 160 ,{320 ,349 ,480 } },
{ 192 ,{384 ,417 ,576 } }, { 192 ,{384 ,418 ,576 } },
{ 224 ,{448 ,487 ,672 } }, { 224 ,{448 ,488 ,672 } },
{ 256 ,{512 ,557 ,768 } }, { 256 ,{512 ,558 ,768 } },
{ 320 ,{640 ,696 ,960 } }, { 320 ,{640 ,697 ,960 } },
{ 384 ,{768 ,835 ,1152 } }, { 384 ,{768 ,836 ,1152 } },
{ 448 ,{896 ,975 ,1344 } }, { 448 ,{896 ,976 ,1344 } },
{ 512 ,{1024 ,1114 ,1536 } }, { 512 ,{1024 ,1115 ,1536 } },
{ 576 ,{1152 ,1253 ,1728 } }, { 576 ,{1152 ,1254 ,1728 } },
{ 640 ,{1280 ,1393 ,1920 } }, { 640 ,{1280 ,1394 ,1920 } }
};
static const uint_16 nfchans[8] = {2,1,2,3,3,4,4,5};
void printbytes(unsigned char *buf, int len)
{
for(int i = 0; i < len; i++ )
printf("%02X ",buf[i]);
printf("\n");
}
static void save_ppm (int width, int height, uint8_t * buf, int num, int picType, int temporalReference)
//static void save_ppm (int width, int height, uint8_t * const * buf, int num)
{
char filename[100];
char cType = 'U';
FILE * ppmfile;
if( picType == PIC_FLAG_CODING_TYPE_I )
cType = 'I';
else if( picType == PIC_FLAG_CODING_TYPE_P )
cType = 'P';
else if( picType == PIC_FLAG_CODING_TYPE_B )
cType = 'B';
sprintf (filename, "%08d_%02d_%c.ppm", num, temporalReference, cType);
ppmfile = fopen (filename, "wb");
if (!ppmfile)
return;
fprintf (ppmfile, "P6\n%d %d\n255\n", width, height);
fwrite (buf, 3 * width, height, ppmfile);
fclose (ppmfile);
}
static void save_pgm (int width, int height, uint8_t * const * buf, int num)
{
char filename[100];
FILE * pgmfile;
int i;
sprintf (filename, "%d.pgm", num);
pgmfile = fopen (filename, "wb");
if (!pgmfile)
return;
fprintf (pgmfile, "P5\n%d %d\n255\n", width, height * 3 / 2);
fwrite (buf[0], width, height, pgmfile);
width >>= 1;
height >>= 1;
for (i = 0; i < height; i++) {
fwrite (buf[1] + i * width, width, 1, pgmfile);
fwrite (buf[2] + i * width, width, 1, pgmfile);
}
fclose (pgmfile);
}
// from mpeg2dec.cpp
void decode_mpeg2 (uint8_t * current, uint8_t * end)
{
if(ignorevideo)
return;
const mpeg2_info_t * info;
// int state;
mpeg2_state_t state;
mpeg2_buffer (mpeg2dec, current, end);
info = mpeg2_info (mpeg2dec);
//info->user_data = iCurrentDecodedFrame;
// while (1)
while ((state = (mpeg2_state_t)mpeg2_parse (mpeg2dec)) != STATE_BUFFER) {
// {
// state = mpeg2_parse (mpeg2dec);
/*
if( state >= 0)
dsyslog(LOG_INFO, "mpeg2state is %d(%s) pictype is %s",state, (state >= 0 && state <= 9) ? states[state] : states[0],(mpeg2dec->decoder.coding_type >= 0 && mpeg2dec->decoder.coding_type <= 4) ? pictype[mpeg2dec->decoder.coding_type] : pictype[0]);
*/
switch (state)
{
case -1:
return;
case STATE_SEQUENCE:
/*
if(doConversion)
mpeg2_convert (mpeg2dec, convert_rgb24, NULL);
*/
break;
case STATE_PICTURE:
/*
// in this state, we know the frame (picture) type
{
int picType = ( info->current_picture->flags & PIC_MASK_CODING_TYPE );
if( picType != PIC_FLAG_CODING_TYPE_I )
mpeg2_skip( mpeg2dec, / *skip* / true );
}
*/
break;
case STATE_SLICE:
case STATE_END:
if (info->display_fbuf)
{
//save_ppm (info->sequence->width, info->sequence->height, info->display_fbuf->buf[0], iCurrentDecodedFrame);
iFrameDisplayed++;
int picType = info->current_picture ? ( info->current_picture->flags & PIC_MASK_CODING_TYPE ):0;
if( picType != PIC_FLAG_CODING_TYPE_I )
iframeDisplay = true;
else
iframeDisplay = false;
if (current_cbf)
{
current_cbf ((void *)info->display_fbuf->buf[0],info->sequence->width, info->sequence->height, (void *)info->display_fbuf->buf);
}
//save_ppm (info->sequence->width, info->sequence->height,
// info->display_fbuf->buf[0], info->user_data, picType,info->display_picture->temporal_reference);
//save_pgm (info->sequence->width, info->sequence->height, info->display_fbuf->buf, iCurrentDecodedFrame);
}
break;
default:
break;
}
}
}
void scan_private_stream_1(unsigned char *buf, int len)
{
int m;
//printf("scan_private_stream_1, len=%d ",len);
//printbytes(buf,10);
unsigned char c = buf[0];
if(
(c >= 0x20 && c <= 0x3f) // Subpictures
//|| (c >= 0x80 && c <= 0x87) // Dolby Digital Audio
|| (c >= 0x88 && c <= 0x8f) // DTS Audio
|| (c >= 0xa0 && c <= 0xa7) // Linear PCM Audio
)
return;
// not handled yet, seems to be AC3 stream
if(len >= 6)
{
int l = len;
while (l > 5)
{
m = buf[0]*256+buf[1];
if (m == 0x0b77)
{
streamHasAC3 = true;
//printbytes(buf,30);
// Get the audio coding mode (ie how many channels)
int acmod = (((uint_8)buf[6])>>5)&7;
//printf(" acmod %d %0X ", acmod,buf[6]);
int infchans = nfchans[acmod];
int shift=4;
// If it is in use, skip the centre channel mix level
if ((acmod & 0x1) && (acmod != 0x1))
shift -=2;
// If it is in use, skip the surround channel mix level
if (acmod & 0x4)
shift -=2;
// skip the dolby surround mode if in 2/0 mode
if(acmod == 0x2)
shift -=2;
// bsi->dsurmod= bitstream_get(2);
// Is the low frequency effects channel on?
int lfeon = (((uint_8)buf[6])>>shift)&1;
ac3mode = infchans*10+lfeon;
if( current_audiocbf )
current_audiocbf(ac3mode);
//printf("chans %d.%d\n", infchans,lfeon);
return;
}
else
{
l--;
buf++;
}
}
}
}
static unsigned int bitrates[3][16] =
{{0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,0},
{0,32,48,56,64,80,96,112,128,160,192,224,256,320,384,0},
{0,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0}};
static uint32_t freq[4] = {441, 480, 320, 0};
/*
mpeg audio header
syncword 12 bits bslbf
ID 1 bit bslbf
layer 2 bits bslbf
protection_bit 1 bit bslbf
bitrate_index 4 bits bslbf
sampling_frequency 2 bits bslbf
padding_bit 1 bit bslbf
private_bit 1 bit bslbf
mode 2 bits bslbf
mode_extension 2 bits bslbf
copyright 1 bit bslbf
original/home 1 bit bslbf
emphasis 2 bits bslbf
*/
static AudioInfo _ai;
static AudioInfo *ai=&_ai;
static int pr = 1;
static int oldscan_audio_stream_0(unsigned char *mbuf, int count)
{
uint8_t *headr;
int found = 0;
int c = 0;
int fr =0;
while (!found && c < count)
{
uint8_t *b = mbuf+c;
if ( b[0] == 0xff && (b[1] & 0xf8) == 0xf8)
found = 1;
else {
c++;
}
}
if (!found) return -1;
if (c+3 >= count) return -1;
headr = mbuf+c;
ai->layer = (headr[1] & 0x06) >> 1;
if (pr)
fprintf(stderr,"Audiostream: Layer: %d", 4-ai->layer);
ai->bit_rate = bitrates[(3-ai->layer)][(headr[2] >> 4 )]*1000;
if (pr)
{
if (ai->bit_rate == 0)
fprintf (stderr," Bit rate: free");
else if (ai->bit_rate == 0xf)
fprintf (stderr," BRate: reserved");
else
fprintf (stderr," BRate: %d kb/s", ai->bit_rate/1000);
}
fr = (headr[2] & 0x0c ) >> 2;
ai->frequency = freq[fr]*100;
if (pr)
{
if (ai->frequency == 3)
fprintf (stderr, " Freq: reserved\n");
else
fprintf (stderr," Freq: %2.1f kHz\n",
ai->frequency/1000.);
}
ai->off = c;
ai->mode = headr[3]>>6;
fprintf(stderr,"mode: %d\n", ai->mode);
return c;
}
#define DEMUX_HEADER 0
#define DEMUX_DATA 1
#define DEMUX_SKIP 2
static int state = DEMUX_SKIP;
static int state_bytes = 0;
void demux_reset(void)
{
state = DEMUX_SKIP;
state_bytes = 0;
}
// from mpeg2dec.cpp
int demuxPES (uint8_t * buf, uint8_t * end, int flags)
{
int iRet = 0;
static int mpeg1_skip_table[16] =
{
0, 0, 4, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
/*
* the demuxer keeps some state between calls:
* if "state" = DEMUX_HEADER, then "head_buf" contains the first
* "bytes" bytes from some header.
* if "state" == DEMUX_DATA, then we need to copy "bytes" bytes
* of ES data before the next header.
* if "state" == DEMUX_SKIP, then we need to skip "bytes" bytes
* of data before the next header.
*
* NEEDBYTES makes sure we have the requested number of bytes for a
* header. If we dont, it copies what we have into head_buf and returns,
* so that when we come back with more data we finish decoding this header.
*
* DONEBYTES updates "buf" to point after the header we just parsed.
*/
static uint8_t head_buf[264];
uint8_t * header;
int bytes;
int len;
#define NEEDBYTES(x) \
do { \
int missing; \
\
missing = (x) - bytes; \
if (missing > 0) { \
if (header == head_buf) { \
if (missing <= end - buf) { \
memcpy (header + bytes, buf, missing); \
buf += missing; \
bytes = (x); \
} else { \
memcpy (header + bytes, buf, end - buf); \
state_bytes = bytes + end - buf; \
return iRet; \
} \
} else { \
memcpy (head_buf, header, bytes); \
state = DEMUX_HEADER; \
state_bytes = bytes; \
return iRet; \
} \
} \
} while (0)
#define DONEBYTES(x) \
do { \
if (header != head_buf) \
buf = header + (x); \
} while (0)
if (flags & DEMUX_RESET)
{
state = DEMUX_SKIP;
state_bytes = 0;
}
if (flags & DEMUX_PAYLOAD_START)
{
state = DEMUX_SKIP;
goto payload_start;
}
switch (state)
{
case DEMUX_HEADER:
if (state_bytes > 0)
{
header = head_buf;
bytes = state_bytes;
goto continue_header;
}
break;
case DEMUX_DATA:
if (demux_pid || (state_bytes > end - buf))
{
decode_mpeg2 (buf, end);
state_bytes -= end - buf;
return iRet;
}
decode_mpeg2 (buf, buf + state_bytes);
buf += state_bytes;
break;
case DEMUX_SKIP:
if (demux_pid || (state_bytes > end - buf))
{
state_bytes -= end - buf;
return iRet;
}
buf += state_bytes;
break;
}
while (1)
{
if (demux_pid)
{
state = DEMUX_SKIP;
return iRet;
}
payload_start:
header = buf;
bytes = end - buf;
continue_header:
NEEDBYTES (4);
if (header[0] || header[1] || (header[2] != 1))
{
if (demux_pid)
{
state = DEMUX_SKIP;
return iRet;
}
else if (header != head_buf)
{
buf++;
goto payload_start;
}
else
{
header[0] = header[1];
header[1] = header[2];
header[2] = header[3];
bytes = 3;
goto continue_header;
}
}
if (demux_pid)
{
if ((header[3] >= 0xe0) && (header[3] <= 0xef))
goto pes;
fprintf (stderr, "bad stream id %x\n", header[3]);
exit (1);
}
switch (header[3])
{
case 0xb9: /* program end code */
/* DONEBYTES (4); */
/* break; */
return 1;
case 0xba: /* pack header */
NEEDBYTES (12);
if ((header[4] & 0xc0) == 0x40)
{ /* mpeg2 */
NEEDBYTES (14);
len = 14 + (header[13] & 7);
NEEDBYTES (len);
DONEBYTES (len);
/* header points to the mpeg2 pack header */
}
else if ((header[4] & 0xf0) == 0x20)
{ /* mpeg1 */
DONEBYTES (12);
/* header points to the mpeg1 pack header */
}
else
{
fprintf (stderr, "weird pack header\n");
//exit (1);
return -1;
}
break;
case 0xbd: // private stream 1
NEEDBYTES (9);
//printbytes(header,9);
//printbytes(buf,9+10);
len = header[4]*256+header[5]+6;
NEEDBYTES(len);
if ((buf[7] & 0x80) && (buf[8] >= 5))
{
ac3pts = 0;
ac3pts = (((uint_64)buf[9]) & 0x0e) << 29;
ac3pts |= ( (uint_64)buf[10]) << 22;
ac3pts |= (((uint_64)buf[11]) & 0xfe) << 14;
ac3pts |= ( (uint_64)buf[12]) << 7;
ac3pts |= (((uint_64)buf[13]) & 0xfe) >> 1;
//printf(" len total=%d, ac3pts: %llums\n", len,ac3pts/90);
}
scan_private_stream_1(buf+9+buf[8],len-9-buf[8]);
DONEBYTES(len);
break;
case 0xc0: // audio stream 0
NEEDBYTES (9);
//printbytes(header,9);
//printbytes(buf,9+10);
len = header[4]*256+header[5]+6;
NEEDBYTES(len);
if ((buf[7] & 0x80) && (buf[8] >= 5))
{
audiopts = 0;
audiopts = (((uint_64)buf[9]) & 0x0e) << 29;
audiopts |= ( (uint_64)buf[10]) << 22;
audiopts |= (((uint_64)buf[11]) & 0xfe) << 14;
audiopts |= ( (uint_64)buf[12]) << 7;
audiopts |= (((uint_64)buf[13]) & 0xfe) >> 1;
//printf(" len total=%d, ac3pts: %llums\n", len,ac3pts/90);
}
#if defined(DECODE_AUDIO) && defined (HAVE_LIBAVCODEC)
scan_audio_stream_0(buf+9+buf[8],len-9-buf[8]);
#endif
if( current_playaudiocbf )
current_playaudiocbf(buf+9+buf[8],len-9-buf[8]);
DONEBYTES(len);
break;
/*
case AUDIO_STREAM_S:
// case PRIVATE_STREAM1:
NEEDBYTES (7);
if ((header[6] & 0xc0) == 0x80)
{ // mpeg2
NEEDBYTES (9);
len = 9 + header[8];
NEEDBYTES (len);
// header points to the mpeg2 pes header
if (header[7] & 0x80)
{
uint32_t pts;
pts = (((header[9] >> 1) << 30) |
(header[10] << 22) | ((header[11] >> 1) << 15) |
(header[12] << 7) | (header[13] >> 1));
mpeg2_pts (mpeg2dec, pts);
fprintf(stderr, "%s pes PTS = %u\n",header[3] == AUDIO_STREAM_S ? "audio" : "ac3" ,pts/900);
}
}
if( bPlayAudio )
{
//if( ossfd <= 0)
// ossfd = oss_open();
mad_decode(ossfd, buf, end-buf);
}
// fall-through
*/
default:
if (header[3] == demux_track)
{
pes:
NEEDBYTES (7);
if ((header[6] & 0xc0) == 0x80)
{ /* mpeg2 */
NEEDBYTES (9);
len = 9 + header[8];
NEEDBYTES (len);
/* header points to the mpeg2 pes header */
if (header[7] & 0x80)
{
videopts = (((uint_64)header[9]) & 0x0e) << 29;
videopts |= ( (uint_64)header[10]) << 22;
videopts |= (((uint_64)header[11]) & 0xfe) << 14;
videopts |= ( (uint_64)header[12]) << 7;
videopts |= (((uint_64)header[13]) & 0xfe) >> 1;
/*
videopts = (((header[9] >> 1) << 30) |
(header[10] << 22) |
((header[11] >> 1) << 15) |
(header[12] << 7) |
(header[13] >> 1));
*/
//mpeg2_pts (mpeg2dec, pts);
//fprintf(stderr, "mpeg pes PTS = %u\n",pts/900);
}
}
else
{ /* mpeg1 */
int len_skip;
uint8_t * ptsbuf;
len = 7;
while (header[len - 1] == 0xff)
{
len++;
NEEDBYTES (len);
if (len == 23)
{
fprintf (stderr, "too much stuffing\n");
break;
}
}
if ((header[len - 1] & 0xc0) == 0x40)
{
len += 2;
NEEDBYTES (len);
}
len_skip = len;
len += mpeg1_skip_table[header[len - 1] >> 4];
NEEDBYTES (len);
/* header points to the mpeg1 pes header */
ptsbuf = header + len_skip;
if (ptsbuf[-1] & 0x20)
{
videopts = (((ptsbuf[-1] >> 1) << 30) |
(ptsbuf[0] << 22) |
((ptsbuf[1] >> 1) << 15) |
(ptsbuf[2] << 7) |
(ptsbuf[3] >> 1));
//mpeg2_pts (mpeg2dec, pts);
}
}
DONEBYTES (len);
bytes = 6 + (header[4] << 8) + header[5] - len;
if (demux_pid || (bytes > end - buf))
{
decode_mpeg2 (buf, end);
state = DEMUX_DATA;
state_bytes = bytes - (end - buf);
return 0;
}
else if (bytes > 0)
{
decode_mpeg2 (buf, buf + bytes);
buf += bytes;
}
}
else if (header[3] < 0xb9)
{
//fprintf (stderr,
// "looks like a video stream, not system stream\n");
esyslog("ERROR: looks like a video stream, not system stream");
dump2log (buf, end );
syslog(LOG_ERR,"header byte follows");
dump2log (header, header+40 );
//exit (1);
return -1;
}
else
{
//fprintf(stderr, "header[3] is %02X\n",header[3]);
NEEDBYTES (6);
DONEBYTES (6);
bytes = (header[4] << 8) + header[5];
//skip:
if (bytes > end - buf)
{
state = DEMUX_SKIP;
state_bytes = bytes - (end - buf);
return iRet;
}
buf += bytes;
}
}
}
return iRet;
}
extern uchar readBuffer[MAXFRAMESIZE]; // frame-buffer
int LastDemuxIndex = -1;
bool bTSFoundPayload = false;
cNoadIndexFile *cCurrentCIF = NULL;
extern YUVBUF volatile lastYUVBuf; // last yuvbuf from StdCallBack
bool demuxFrame(cFileName *cfn, cNoadIndexFile *cIF, int index, int flags )
{
bool ret = false;
uint16_t FileNumber; // current file-number
off_t FileOffset; // current file-offset
int Length; // frame-lenght of current frame
cIF->Get(index,&FileNumber, &FileOffset, NULL, &Length);
LastDemuxIndex = index;
if( index < 0 )
{
show_stackframe(false);
return false;
}
cCurrentCIF = cIF;
ret = demuxFrame(cfn, FileNumber, FileOffset, Length,flags);
if( !cfn->isPES() )
{
if( lastYUVBuf == NULL )
{
dsyslog("!!!!!!!!!!!!!!!!!!!no YUVBuf after demuxTS for frame %d",index );
//exit(-1);
}
}
return ret;
}
static int retries=0;
bool demuxFrame(cFileName *cfn, uint16_t FileNumber, off_t FileOffset, int Length, int flags )
{
uint8_t * end; // pointer to frame-end
cfn->SetOffset( FileNumber, FileOffset);
end = readBuffer + ReadFrame (cfn->File(), readBuffer, Length, MAXFRAMESIZE);
if( cfn->isPES() )
{
bTSFoundPayload = true;
int demuxret = demuxPES (readBuffer, end, flags);
if( demuxret < 0 )
{
syslog(LOG_ERR,"last read was from index %d, file %d, offset %ld, length %d",LastDemuxIndex,FileNumber,FileOffset,Length );
cfn->SetOffset( FileNumber, FileOffset);
end = readBuffer + ReadFrame (cfn->File(), readBuffer, Length, MAXFRAMESIZE);
demuxret = demuxPES (readBuffer, end, DEMUX_RESET);
if( demuxret < 0 )
{
#ifdef VNOAD
if( retries == 0 )
{
retries++;
bool bRet = demuxFrame(cfn, cCurrentCIF, LastDemuxIndex+1,0 );
if( bRet )
{
retries--;
return true;
}
}
#endif
syslog(LOG_ERR,"last read was from index %d",LastDemuxIndex);
exit(1);
}
}
}
else
{
if( dodumpts )
{
syslog(LOG_ERR, "demuxTS");
}
demuxTS(readBuffer, end, flags );
}
return true;
}
int demuxTS(uint8_t * buffer, uint8_t * end, int flags )
{
uint8_t * buf;
uint8_t * nextbuf;
uint8_t * data;
int pid;
buf = buffer;
int demuxflag = flags;
// lastYUVBuf = NULL;
if( dodumpts )
{
dump2log(buffer,end);
}
for (; (nextbuf = buf + 188) <= end; buf = nextbuf)
{
if (*buf != 0x47)
{
fprintf (stderr, "bad sync byte\n");
nextbuf = buf + 1;
continue;
}
pid = ((buf[1] << 8) + buf[2]) & 0x1fff;
if (pid != demux_pid)
continue;
data = buf + 4;
if (buf[3] & 0x20)
{ // buf contains an adaptation field
data = buf + 5 + buf[4];
if (data > nextbuf)
continue;
}
if (buf[3] & 0x10)
{
if( (demuxflag & DEMUX_RESET) == DEMUX_RESET )
{
if( buf[1] & 0x40 )
{
demuxPES (data, nextbuf,DEMUX_PAYLOAD_START|demuxflag);
bTSFoundPayload = true;
demuxflag = 0;
}
}
else
{
demuxPES (data, nextbuf,(buf[1] & 0x40) ? DEMUX_PAYLOAD_START|demuxflag : demuxflag);
demuxflag = 0;
}
}
}
return true;
}