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/*
* extract_mpeg2.c
*
* Copyright (C) Thomas Oestreich - June 2001
* Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* 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 "libtc/libtc.h"
#include "tcinfo.h"
#include "ioaux.h"
#include "avilib/avilib.h"
#include "tc.h"
#define BUFFER_SIZE 262144
static uint8_t buffer[BUFFER_SIZE];
static FILE *in_file, *out_file;
static void ps_loop (void)
{
static int mpeg1_skip_table[16] = {
1, 0xffff, 5, 10, 0xffff, 0xffff, 0xffff, 0xffff,
0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff
};
uint8_t * buf;
uint8_t * end;
uint8_t * tmp1=NULL;
uint8_t * tmp2=NULL;
int complain_loudly;
complain_loudly = 1;
buf = buffer;
do {
end = buf + fread (buf, 1, buffer + BUFFER_SIZE - buf, in_file);
buf = buffer;
//scan buffer
while (buf + 4 <= end) {
// check for valid start code
if (buf[0] || buf[1] || (buf[2] != 0x01)) {
if (complain_loudly) {
tc_log_warn(__FILE__, "missing start code at %#lx",
ftell (in_file) - (end - buf));
if ((buf[0] == 0) && (buf[1] == 0) && (buf[2] == 0))
tc_log_warn(__FILE__, "incorrect zero-byte padding detected - ignored");
complain_loudly = 0;
}
buf++;
continue;
}// check for valid start code
switch (buf[3]) {
case 0xb9: /* program end code */
return;
case 0xba: /* pack header */
/* skip */
if ((buf[4] & 0xc0) == 0x40) /* mpeg2 */
tmp1 = buf + 14 + (buf[13] & 7);
else if ((buf[4] & 0xf0) == 0x20) /* mpeg1 */
tmp1 = buf + 12;
else if (buf + 5 > end)
goto copy;
else {
tc_log_error(__FILE__, "weird pack header");
import_exit(1);
}
if (tmp1 > end)
goto copy;
buf = tmp1;
break;
/* video stream code: 1110???? */
case 0xe0: /* video */
case 0xe1: /* video */
case 0xe2: /* video */
case 0xe3: /* video */
case 0xe4: /* video */
case 0xe5: /* video */
case 0xe6: /* video */
case 0xe7: /* video */
case 0xe8: /* video */
case 0xe9: /* video */
case 0xea: /* video */
case 0xeb: /* video */
case 0xec: /* video */
case 0xed: /* video */
case 0xee: /* video */
case 0xef: /* video */
tmp2 = buf + 6 + (buf[4] << 8) + buf[5];
if (tmp2 > end)
goto copy;
if ((buf[6] & 0xc0) == 0x80) /* mpeg2 */
tmp1 = buf + 9 + buf[8];
else { /* mpeg1 */
for (tmp1 = buf + 6; *tmp1 == 0xff; tmp1++)
if (tmp1 == buf + 6 + 16) {
tc_log_warn(__FILE__, "too much stuffing");
buf = tmp2;
break;
}
if ((*tmp1 & 0xc0) == 0x40)
tmp1 += 2;
tmp1 += mpeg1_skip_table [*tmp1 >> 4];
}
if (tmp1 < tmp2) {
TC_PIPE_WRITE(fileno(out_file), tmp1, tmp2-tmp1);
/* yeah, I know that's ugly -- FR */
}
buf = tmp2;
break;
default:
if (buf[3] < 0xb9)
tc_log_warn(__FILE__, "broken stream - skipping data");
/* skip */
tmp1 = buf + 6 + (buf[4] << 8) + buf[5];
if (tmp1 > end)
goto copy;
buf = tmp1;
break;
} //start code selection
} //scan buffer
if (buf < end) {
copy:
/* we only pass here for mpeg1 ps streams */
memmove (buffer, buf, end - buf);
}
buf = buffer + (end - buf);
} while (end == buffer + BUFFER_SIZE);
}
/* ------------------------------------------------------------
*
* mpeg2 extract thread
*
* magic: TC_MAGIC_VOB
* TC_MAGIC_RAW <-- default
* TC_MAGIC_M2V
* TC_MAGIC_CDXA
*
* ------------------------------------------------------------*/
void extract_mpeg2(info_t *ipipe)
{
int error=0;
verbose = ipipe->verbose;
switch(ipipe->magic) {
case TC_MAGIC_VOB:
in_file = fdopen(ipipe->fd_in, "r");
out_file = fdopen(ipipe->fd_out, "w");
ps_loop();
fclose(in_file);
fclose(out_file);
break;
case TC_MAGIC_CDXA:
AVI_dump(ipipe->name, 2);
break;
case TC_MAGIC_M2V:
case TC_MAGIC_RAW:
default:
if(ipipe->magic == TC_MAGIC_UNKNOWN)
tc_log_warn(__FILE__, "no file type specified, assuming %s",
filetype(TC_MAGIC_RAW));
error=tc_preadwrite(ipipe->fd_in, ipipe->fd_out);
break;
}
import_exit(error);
}
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