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/*
* scan_pack.c
*
* Copyright (C) Thomas Oestreich - June 2001
*
* This file is part of transcode, a video stream processing tool
*
* transcode 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, or (at your option)
* any later version.
*
* transcode is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "transcode.h"
#include "ioaux.h"
#include "aux_pes.h"
#include "seqinfo.h"
#include "demuxer.h"
#include "packets.h"
/* ------------------------------------------------------------
*
* auxiliary routines
*
* ------------------------------------------------------------*/
static char *picture_structure_str[4] = {
"Invalid Picture Structure",
"Top field",
"Bottom field",
"Frame Picture"
};
static int _cmp_32_bits(char *buf, long x)
{
if(0) {
tc_log_msg(__FILE__, "MAGIC: 0x%02lx 0x%02lx 0x%02lx 0x%02lx", (x >> 24) & 0xff, ((x >> 16) & 0xff), ((x >> 8) & 0xff), ((x ) & 0xff));
tc_log_msg(__FILE__, " FILE: 0x%02x 0x%02x 0x%02x 0x%02x", buf[0] & 0xff, buf[1] & 0xff, buf[2] & 0xff, buf[3] & 0xff);
}
if ((buf[0]& 0xff) != ((x >> 24) & 0xff))
return 0;
if ((buf[1]& 0xff) != ((x >> 16) & 0xff))
return 0;
if ((buf[2] & 0xff)!= ((x >> 8) & 0xff))
return 0;
if ((buf[3]& 0xff) != ((x ) & 0xff))
return 0;
// OK found it
return 1;
}
static int _cmp_16_bits(char *buf, long x)
{
if(0) {
tc_log_msg(__FILE__, "MAGIC: 0x%02lx 0x%02lx 0x%02lx 0x%02lx %s", (x >> 24) & 0xff, ((x >> 16) & 0xff), ((x >> 8) & 0xff), ((x ) & 0xff), filetype(x));
tc_log_msg(__FILE__, " FILE: 0x%02x 0x%02x 0x%02x 0x%02x", buf[2] & 0xff, buf[3] & 0xff, buf[0] & 0xff, buf[1] & 0xff);
}
if ((uint8_t)buf[0] != ((x >> 8) & 0xff))
return 0;
if ((uint8_t)buf[1] != ((x ) & 0xff))
return 0;
// OK found it
return 1;
}
static int pack_scan_16(char *video, long magic)
{
int k, off = (video[VOB_PACKET_OFFSET] & 0xff) + VOB_PACKET_OFFSET + 1;
for(k=off; k<=VOB_PACKET_SIZE-2; ++k) {
if(_cmp_16_bits(video+k, magic)) return(k);
}// scan buffer
return(-1);
}
static int pack_scan_32(char *video, long magic)
{
int k, off = (video[VOB_PACKET_OFFSET] & 0xff) + VOB_PACKET_OFFSET + 1;
for(k=off; k<=VOB_PACKET_SIZE-4; ++k) {
if(_cmp_32_bits(video+k, magic)) return(k);
}// scan buffer
return(-1);
}
#if 0 // unused
static unsigned long read_ts(char *_s)
{
unsigned long pts;
char *buffer=_s;
unsigned int ptr=0;
pts = (buffer[ptr++] >> 1) & 7; //low 4 bits (7==1111)
pts <<= 15;
pts |= (stream_read_int16(&buffer[ptr]) >> 1);
ptr+=2;
pts <<= 15;
pts |= (stream_read_int16(&buffer[ptr]) >> 1);
return pts;
}
#endif
#define BUF_WARN_COUNT 20
static int probe_picext(uint8_t *buffer, size_t buflen)
{
// static char *picture_structure_str[4] = {
// "Invalid Picture Structure",
// "Top field",
// "Bottom field",
// "Frame Picture"
//};
if(buflen < 3) {
#ifdef PROBE_DEBUG
static int buf_small_count = 0;
if(buf_small_count == 0
|| (buf_small_count % BUF_WARN_COUNT) == 0) {
tc_log_warn(__FILE__, "not enough buffer to probe picture extension "
"(buflen=%lu) [happened at least %i times]",
(unsigned long)buflen, buf_small_count);
}
buf_small_count++;
#endif
return(-1); /* failed probe */
}
return(buffer[2] & 3);
}
static const char *probe_group(uint8_t *buffer, size_t buflen)
{
static char retbuf[32];
if(buflen < 5) {
#ifdef PROBE_DEBUG
static int buf_small_count = 0;
if(buf_small_count == 0
|| (buf_small_count % BUF_WARN_COUNT) == 0) {
tc_log_warn(__FILE__, "not enough buffer to probe picture group "
"(buflen=%lu) [happened at least %i times]",
(unsigned long)buflen, buf_small_count);
}
buf_small_count++;
#endif
*retbuf = 0;
} else {
tc_snprintf(retbuf, sizeof(retbuf), "%s%s",
(buffer[4] & 0x40) ? " closed_gop" : "",
(buffer[4] & 0x20) ? " broken_link" : "");
}
return retbuf;
}
int flag1=0, flag2=0, flag3=0;
int scan_pack_pics(char *video)
{
int k, off = (video[VOB_PACKET_OFFSET] & 0xff) + VOB_PACKET_OFFSET + 1;
int ctr=0;
if(flag1) if( (video[off] & 0xff) == 0) ++ctr;
if(flag2) if( (video[off] & 0xff) == 1 && (video[off+1] & 0xff) == 0) ++ctr;
if(flag3) if( (video[off] & 0xff) == 0 && (video[off+1] & 0xff) == 1 && (video[off+2] & 0xff) == 0) ++ctr;
// tc_log_msg(__FILE__, "off=%d byte=0x%x byte=0x%x ctr=%d", off , (video[off] & 0xff), (video[VOB_PACKET_SIZE-4] & 0xff), ctr);
if(ctr && (verbose & TC_PRIVATE)) tc_log_msg(__FILE__, "split PIC code detected");
flag1=flag2=flag3=0;
for(k=off; k<=VOB_PACKET_SIZE-4; ++k) {
if(_cmp_32_bits(video+k, MPEG_PICTURE_START_CODE)) ++ctr;
}
if( (video[VOB_PACKET_SIZE-1] & 0xff) == 0) flag3=1;
if( (video[VOB_PACKET_SIZE-2] & 0xff) == 0 && (video[VOB_PACKET_SIZE-1] & 0xff) == 0) flag2=1;
if( (video[VOB_PACKET_SIZE-3] & 0xff) == 0 && (video[VOB_PACKET_SIZE-2] & 0xff) == 0 && (video[VOB_PACKET_SIZE-1] & 0xff) == 1) flag1=1;
// tc_log_msg(__FILE__, "ctr= %d | f1=%d, f2=%d, f3=%d", ctr, flag1, flag2, flag3);
return(ctr);
}
int scan_pack_ext(char *buf)
{
int n, ret_code=-1;
for(n=0; n<VOB_PACKET_SIZE-4; ++n) {
if(_cmp_32_bits(buf+n, TC_MAGIC_PICEXT) && ((uint8_t) buf[n+4]>>4)==8){
ret_code = probe_picext(buf+n+4, VOB_PACKET_SIZE-4-n);
}
} // probe extension header
return(ret_code);
}
void scan_pack_payload(char *video, size_t size, int n, int verbose)
{
int k;
char buf[256];
unsigned long i_pts, i_dts;
int aud_tag, vid_tag;
int len;
double pts;
seq_info_t si;
// scan payload
// time stamp:
ac_memcpy(buf, &video[4], 6);
pts = read_time_stamp(buf);
// tc_log_msg(__FILE__, "PTS=%ld %d %f %ld", read_time_stamp_long(buf),read_ts(buf), read_ts(buf)/90000., parse_pts(buf, 2));
// payload length
len = stream_read_int16(&video[18]);
tc_log_msg(__FILE__, "[%06d] id=0x%x SCR=%12.8f size=%4d", n, (video[17] & 0xff), pts, len);
if((video[17] & 0xff) == P_ID_MPEG) {
if((k=pack_scan_32(video, TC_MAGIC_M2V))!=-1) {
tc_log_msg(__FILE__, " MPEG SEQ start code found in packet %d, offset %4d", n, k);
//read packet header
ac_memcpy(buf, &video[20], 16);
get_pts_dts(buf, &i_pts, &i_dts);
tc_log_msg(__FILE__, " PTS=%f DTS=%f", (double) i_pts / 90000., (double) i_dts / 90000.);
stats_sequence(&video[k+4], &si);
}
if((k=pack_scan_32(video, MPEG_SEQUENCE_END_CODE))!=-1)
tc_log_msg(__FILE__, " MPEG SEQ end code found in packet %d, offset %4d", n, k);
if((k=pack_scan_32(video, MPEG_EXT_START_CODE))!=-1) {
if(((uint8_t)video[k+4]>>4)==8) {
int mode = probe_picext(&video[k+4], size - (size_t)k);
if(mode > 0)
tc_log_msg(__FILE__, " MPEG EXT start code found in packet %d, offset %4d, %s", n, k, picture_structure_str[mode]);
else
tc_log_msg(__FILE__, " MPEG EXT start code found INCOMPLETE in packet %d, offset %4d", n, k);
} else
tc_log_msg(__FILE__, " MPEG EXT start code found in packet %d, offset %4d", n, k);
}
if((k=pack_scan_32(video, MPEG_GOP_START_CODE))!=-1) {
tc_log_msg(__FILE__, " MPEG GOP start code found in packet %d, offset %4d, gop [%03d]%s",
n, k, gop_cnt,
probe_group((uint8_t*) &video[k+4], size - (size_t)k));
gop_pts=pts;
++gop_cnt;
gop=1;
}
if((k=pack_scan_32(video, MPEG_PICTURE_START_CODE))!=-1)
tc_log_msg(__FILE__, " MPEG PIC start code found in packet %d, offset %4d", n, k);
if((k=pack_scan_32(video, MPEG_SYSTEM_START_CODE))!=-1)
tc_log_msg(__FILE__, " MPEG SYS start code found in packet %d, offset %4d", n, k);
if((k=pack_scan_32(video, MPEG_PADDING_START_CODE))!=-1)
tc_log_msg(__FILE__, " MPEG PAD start code found in packet %d, offset %4d", n, k);
}
if((video[17] & 0xff) == P_ID_AC3) {
//position of track code
uint8_t *ibuf=video+14;
uint8_t *tmp=ibuf + 9 + ibuf[8];
//read packet header
ac_memcpy(buf, &video[20], 16);
get_pts_dts(buf, &i_pts, &i_dts);
tc_log_msg(__FILE__, " substream PTS=%f [0x%x]", (double) i_pts / 90000., *tmp);
if((k=pack_scan_16(video, TC_MAGIC_AC3))!=-1) {
if(gop) {
tc_log_msg(__FILE__, " AC3 sync frame, packet %6d, offset %3d, gop [%03d], A-V %.3f", n, k, gop_cnt-1, pts-gop_pts);
gop=0;
} else
tc_log_msg(__FILE__, " AC3 sync frame found in packet %d, offset %d", n, k);
}
if((k=pack_scan_32(video, MPEG_PADDING_START_CODE))!=-1)
tc_log_msg(__FILE__, " MPEG PAD start code found in packet %d, offset %4d", n, k);
}
if((video[17] & 0xff) >= 0xc0 && (video[17] & 0xff) <= 0xdf) {
//read packet header
ac_memcpy(buf, &video[20], 16);
get_pts_dts(buf, &i_pts, &i_dts);
tc_log_msg(__FILE__, " MPEG audio PTS=%f [0x%x]", (double) i_pts / 90000., (video[17] & 0xff));
}
if((video[17] & 0xff) == P_ID_PROG) {
aud_tag = (video[23]>>2) & 0x3f;
vid_tag = video[24] & 0x1f;
tc_log_msg(__FILE__, " MPEG PRG start code found in packet %d, A=%d, V=%d", n, aud_tag, vid_tag);
}// check for sync packet
return;
}
int scan_pack_header(char *buf, long x)
{
int ret = _cmp_32_bits(buf, x);
if(0) tc_log_msg(__FILE__, "scan_pack_header() ret=%d", ret);
return(ret);
}
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