/*****************************************************************************
* ps.c : Program Stream input module for vlc
*****************************************************************************
* Copyright (C) 2000-2001 VideoLAN
* $Id: ps.c,v 1.5 2002/08/30 22:22:24 massiot Exp $
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdlib.h> /* malloc(), free() */
#include <string.h> /* strdup() */
#include <errno.h>
#include <vlc/vlc.h>
#include <vlc/input.h>
#include <sys/types.h>
#include "system.h"
/*****************************************************************************
* Constants
*****************************************************************************/
#define PS_READ_ONCE 50
/*****************************************************************************
* Private structure
*****************************************************************************/
struct demux_sys_t
{
module_t * p_module;
mpeg_demux_t mpeg;
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int Activate ( vlc_object_t * );
static void Deactivate ( vlc_object_t * );
static int Demux ( input_thread_t * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin();
set_description( _("ISO 13818-1 MPEG Program Stream input") );
set_capability( "demux", 1 );
set_callbacks( Activate, Deactivate );
add_shortcut( "ps" );
vlc_module_end();
/*****************************************************************************
* Activate: initialize PS structures
*****************************************************************************/
static int Activate( vlc_object_t * p_this )
{
input_thread_t * p_input = (input_thread_t *)p_this;
demux_sys_t * p_demux;
byte_t * p_peek;
/* Set the demux function */
p_input->pf_demux = Demux;
/* Initialize access plug-in structures. */
if( p_input->i_mtu == 0 )
{
/* Improve speed. */
p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
}
/* Have a peep at the show. */
if( input_Peek( p_input, &p_peek, 4 ) < 4 )
{
/* Stream shorter than 4 bytes... */
msg_Err( p_input, "cannot peek()" );
return -1;
}
if( *p_peek || *(p_peek + 1) || *(p_peek + 2) != 1 )
{
if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
{
/* User forced */
msg_Err( p_input, "this does not look like an MPEG PS stream, continuing" );
}
else
{
msg_Warn( p_input, "this does not look like an MPEG PS stream, "
"but continuing anyway" );
}
}
else if( *(p_peek + 3) <= 0xb9 )
{
if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
{
/* User forced */
msg_Err( p_input, "this seems to be an elementary stream (ES module?), but continuing" );
}
else
{
msg_Warn( p_input, "this seems to be an elementary stream (ES module?), but continuing" );
}
}
p_demux = p_input->p_demux_data = malloc( sizeof(demux_sys_t ) );
if( p_demux == NULL )
{
return -1;
}
p_input->p_private = (void*)&p_demux->mpeg;
p_demux->p_module = module_Need( p_input, "mpeg-system", NULL );
if( p_demux->p_module == NULL )
{
free( p_input->p_demux_data );
return -1;
}
if( input_InitStream( p_input, sizeof( stream_ps_data_t ) ) == -1 )
{
module_Unneed( p_input, p_demux->p_module );
free( p_input->p_demux_data );
return -1;
}
input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
p_input->stream.p_selected_program =
p_input->stream.pp_programs[0] ;
if( p_input->stream.b_seekable )
{
stream_ps_data_t * p_demux_data =
(stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
/* Pre-parse the stream to gather stream_descriptor_t. */
p_input->stream.pp_programs[0]->b_is_ok = 0;
p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
while( !p_input->b_die && !p_input->b_error
&& !p_demux_data->b_has_PSM )
{
ssize_t i_result;
data_packet_t * p_data;
i_result = p_demux->mpeg.pf_read_ps( p_input, &p_data );
if( i_result == 0 )
{
/* EOF */
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.pp_programs[0]->b_is_ok = 1;
vlc_mutex_unlock( &p_input->stream.stream_lock );
break;
}
else if( i_result == -1 )
{
p_input->b_error = 1;
break;
}
p_demux->mpeg.pf_parse_ps( p_input, p_data );
input_DeletePacket( p_input->p_method_data, p_data );
/* File too big. */
if( p_input->stream.p_selected_area->i_tell >
INPUT_PREPARSE_LENGTH )
{
break;
}
}
input_AccessReinit( p_input );
p_input->pf_seek( p_input, (off_t)0 );
vlc_mutex_lock( &p_input->stream.stream_lock );
if( p_demux_data->b_has_PSM )
{
/* (The PSM decoder will care about spawning the decoders) */
p_input->stream.pp_programs[0]->b_is_ok = 1;
}
#ifdef AUTO_SPAWN
else
{
/* (We have to do it ourselves) */
int i_es;
/* FIXME: we should do multiple passes in case an audio type
* is not present */
for( i_es = 0;
i_es < p_input->stream.pp_programs[0]->i_es_number;
i_es++ )
{
#define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
switch( p_es->i_fourcc )
{
case VLC_FOURCC('m','p','g','v'):
input_SelectES( p_input, p_es );
break;
case VLC_FOURCC('m','p','g','a'):
if( config_GetInt( p_input, "audio-channel" )
== (p_es->i_id & 0x1F) ||
( config_GetInt( p_input, "audio-channel" ) < 0
&& !(p_es->i_id & 0x1F) ) )
switch( config_GetInt( p_input, "audio-type" ) )
{
case -1:
case REQUESTED_MPEG:
input_SelectES( p_input, p_es );
}
break;
case VLC_FOURCC('a','5','2',' '):
case VLC_FOURCC('a','5','2','b'):
if( config_GetInt( p_input, "audio-channel" )
== ((p_es->i_id & 0xF00) >> 8) ||
( config_GetInt( p_input, "audio-channel" ) < 0
&& !((p_es->i_id & 0xF00) >> 8) ) )
switch( config_GetInt( p_input, "audio-type" ) )
{
case -1:
case REQUESTED_A52:
input_SelectES( p_input, p_es );
}
break;
case VLC_FOURCC('s','p','u',' '):
case VLC_FOURCC('s','p','u','b'):
if( config_GetInt( p_input, "spu-channel" )
== ((p_es->i_id & 0x1F00) >> 8) )
{
input_SelectES( p_input, p_es );
}
break;
case VLC_FOURCC('l','p','c','m'):
case VLC_FOURCC('l','p','c','b'):
if( config_GetInt( p_input, "audio-channel" )
== ((p_es->i_id & 0x1F00) >> 8) ||
( config_GetInt( p_input, "audio-channel" ) < 0
&& !((p_es->i_id & 0x1F00) >> 8) ) )
switch( config_GetInt( p_input, "audio-type" ) )
{
case -1:
case REQUESTED_LPCM:
input_SelectES( p_input, p_es );
}
break;
}
#undef p_es
}
}
#endif
input_DumpStream( p_input );
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
else
{
/* The programs will be added when we read them. */
vlc_mutex_lock( &p_input->stream.stream_lock );
p_input->stream.pp_programs[0]->b_is_ok = 0;
vlc_mutex_unlock( &p_input->stream.stream_lock );
}
return 0;
}
/*****************************************************************************
* Deactivate: deinitialize PS structures
*****************************************************************************/
static void Deactivate( vlc_object_t * p_this )
{
input_thread_t * p_input = (input_thread_t *)p_this;
module_Unneed( p_input, p_input->p_demux_data->p_module );
free( p_input->p_demux_data );
}
/*****************************************************************************
* Demux: reads and demuxes data packets
*****************************************************************************
* Returns -1 in case of error, 0 in case of EOF, otherwise the number of
* packets.
*****************************************************************************/
static int Demux( input_thread_t * p_input )
{
int i;
for( i = 0; i < PS_READ_ONCE; i++ )
{
data_packet_t * p_data;
ssize_t i_result;
i_result = p_input->p_demux_data->mpeg.pf_read_ps( p_input, &p_data );
if( i_result <= 0 )
{
return i_result;
}
p_input->p_demux_data->mpeg.pf_demux_ps( p_input, p_data );
}
return i;
}