Commit 92c56736 authored by Christophe Massiot's avatar Christophe Massiot

* examples/get_pcr_pid.c: New example to output the PCR PID of a TS file.

parent 63d5c0cb
## Process this file with automake to produce Makefile.in
noinst_PROGRAMS = decode_pat decode_pmt decode_sdt decode_mpeg
noinst_PROGRAMS = decode_pat decode_pmt get_pcr_pid decode_sdt decode_mpeg
decode_pat_SOURCES = decode_pat.c
decode_pat_LDFLAGS = -L../src -ldvbpsi
......@@ -8,6 +8,9 @@ decode_pat_LDFLAGS = -L../src -ldvbpsi
decode_pmt_SOURCES = decode_pmt.c
decode_pmt_LDFLAGS = -L../src -ldvbpsi -lm
get_pcr_pid_SOURCES = get_pcr_pid.c
get_pcr_pid_LDFLAGS = -L../src -ldvbpsi -lm
decode_sdt_SOURCES = decode_sdt.c
decode_sdt_LDFLAGS = -L../src -ldvbpsi
......
/*****************************************************************************
* get_pcr_pid.c: stdout the PID of the PCR of a given program
*****************************************************************************
* Copyright (C) 2009 VideoLAN
* $Id: pcread.c 15 2006-06-15 22:17:58Z cmassiot $
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* 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 program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <fcntl.h>
#if defined(HAVE_INTTYPES_H)
#include <inttypes.h>
#elif defined(HAVE_STDINT_H)
#include <stdint.h>
#endif
/* The libdvbpsi distribution defines DVBPSI_DIST */
#ifdef DVBPSI_DIST
#include "../src/dvbpsi.h"
#include "../src/descriptor.h"
#include "../src/demux.h"
#include "../src/tables/pat.h"
#include "../src/tables/pmt.h"
#include "../src/psi.h"
#else
#include <dvbpsi/dvbpsi.h>
#include <dvbpsi/descriptor.h>
#include <dvbpsi/demux.h>
#include <dvbpsi/pat.h>
#include <dvbpsi/pmt.h>
#include <dvbpsi/psi.h>
#endif
/*****************************************************************************
* Local declarations
*****************************************************************************/
#define READ_ONCE 100
#define MAX_PROGRAMS 25
#define TS_SIZE 188
static int i_fd = -1;
static int i_ts_read = 0;
static dvbpsi_handle p_pat_dvbpsi_fd;
static int i_nb_programs = 0;
static uint16_t i_program = 0;
static uint16_t pi_pmt_pids[MAX_PROGRAMS];
static dvbpsi_handle p_pmt_dvbpsi_fds[MAX_PROGRAMS];
/*****************************************************************************
* PMTCallback
*****************************************************************************/
static void PMTCallback( void *_unused, dvbpsi_pmt_t *p_pmt )
{
printf( "%u\n", p_pmt->i_pcr_pid );
close( i_fd );
exit(EXIT_SUCCESS);
}
/*****************************************************************************
* PATCallback
*****************************************************************************/
static void PATCallback( void *_unused, dvbpsi_pat_t *p_pat )
{
dvbpsi_pat_program_t *p_program;
for( p_program = p_pat->p_first_program; p_program != NULL;
p_program = p_program->p_next )
{
if( p_program->i_number != 0
&& (!i_program || i_program == p_program->i_number) )
{
pi_pmt_pids[i_nb_programs] = p_program->i_pid;
p_pmt_dvbpsi_fds[i_nb_programs] =
dvbpsi_AttachPMT( p_program->i_number, PMTCallback,
NULL );
i_nb_programs++;
}
}
dvbpsi_DeletePAT( p_pat );
}
/*****************************************************************************
* TSHandle: find and decode PSI
*****************************************************************************/
static inline uint16_t ts_GetPID( const uint8_t *p_ts )
{
return (((uint16_t)p_ts[1] & 0x1f) << 8) | p_ts[2];
}
static inline int ts_CheckSync( const uint8_t *p_ts )
{
return p_ts[0] == 0x47;
}
static void TSHandle( const uint8_t *p_ts )
{
uint16_t i_pid = ts_GetPID( p_ts );
int i;
if ( !ts_CheckSync( p_ts ) )
{
fprintf( stderr, "lost TS synchro, go and fix your file (pos=%ju)\n",
(uintmax_t)i_ts_read * TS_SIZE );
exit(EXIT_FAILURE);
}
if ( i_pid == 0 && !i_nb_programs )
{
dvbpsi_PushPacket( p_pat_dvbpsi_fd, p_ts );
}
for ( i = 0; i < i_nb_programs; i++ )
{
if ( pi_pmt_pids[i] == i_pid )
dvbpsi_PushPacket( p_pmt_dvbpsi_fds[i], p_ts );
}
}
/*****************************************************************************
* Entry point
*****************************************************************************/
int main( int i_argc, char **pp_argv )
{
uint8_t *p_buffer;
if ( i_argc < 2 || i_argc > 3 || !strcmp( pp_argv[1], "-" ) )
{
fprintf( stderr, "Usage: get_pcr_pid <input ts> [<program number>]\n" );
exit(EXIT_FAILURE);
}
if ( (i_fd = open( pp_argv[1], O_RDONLY )) == -1 )
{
fprintf( stderr, "open(%s) failed (%s)\n", pp_argv[1],
strerror(errno) );
exit(EXIT_FAILURE);
}
if ( i_argc == 3 )
i_program = strtol( pp_argv[2], NULL, 0 );
p_pat_dvbpsi_fd = dvbpsi_AttachPAT( PATCallback, NULL );
p_buffer = malloc( TS_SIZE * READ_ONCE );
for ( ; ; )
{
int i;
ssize_t i_ret;
if ( (i_ret = read( i_fd, p_buffer, TS_SIZE * READ_ONCE )) < 0 )
{
fprintf( stderr, "read error (%s)\n", strerror(errno) );
break;
}
if ( i_ret == 0 )
{
fprintf( stderr, "end of file reached\n" );
break;
}
for ( i = 0; i < i_ret / TS_SIZE; i++ )
{
TSHandle( p_buffer + TS_SIZE * i );
i_ts_read++;
}
}
close( i_fd );
fprintf( stderr, "no PAT/PMT found\n" );
return EXIT_FAILURE;
}
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