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321 lines
11 KiB
321 lines
11 KiB
/*****************************************************************************
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* mpeg_ps.c : Program Stream input module for vlc
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*****************************************************************************
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* Copyright (C) 2000-2001 VideoLAN
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* $Id: mpeg_ps.c,v 1.8 2002/03/18 19:14:52 sam Exp $
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h> /* malloc(), free() */
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#include <string.h> /* strdup() */
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#include <errno.h>
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#include <videolan/vlc.h>
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#include <sys/types.h>
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#include "stream_control.h"
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#include "input_ext-intf.h"
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#include "input_ext-dec.h"
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#include "input_ext-plugins.h"
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/*****************************************************************************
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* Constants
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*****************************************************************************/
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#define PS_READ_ONCE 50
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static void input_getfunctions( function_list_t * p_function_list );
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static int PSDemux ( struct input_thread_s * );
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static int PSInit ( struct input_thread_s * );
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static void PSEnd ( struct input_thread_s * );
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/*****************************************************************************
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* Build configuration tree.
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*****************************************************************************/
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MODULE_CONFIG_START
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MODULE_CONFIG_STOP
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MODULE_INIT_START
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SET_DESCRIPTION( "ISO 13818-1 MPEG Program Stream input" )
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ADD_CAPABILITY( DEMUX, 100 )
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ADD_SHORTCUT( "ps" )
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MODULE_INIT_STOP
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MODULE_ACTIVATE_START
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input_getfunctions( &p_module->p_functions->demux );
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MODULE_ACTIVATE_STOP
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MODULE_DEACTIVATE_START
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MODULE_DEACTIVATE_STOP
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/*****************************************************************************
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* Functions exported as capabilities. They are declared as static so that
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* we don't pollute the namespace too much.
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*****************************************************************************/
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static void input_getfunctions( function_list_t * p_function_list )
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{
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#define input p_function_list->functions.demux
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input.pf_init = PSInit;
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input.pf_end = PSEnd;
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input.pf_demux = PSDemux;
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input.pf_rewind = NULL;
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#undef input
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}
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/*****************************************************************************
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* PSInit: initializes PS structures
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*****************************************************************************/
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static int PSInit( input_thread_t * p_input )
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{
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byte_t * p_peek;
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/* Initialize access plug-in structures. */
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if( p_input->i_mtu == 0 )
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{
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/* Improve speed. */
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p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
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}
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/* Have a peep at the show. */
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if( input_Peek( p_input, &p_peek, 4 ) < 4 )
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{
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/* Stream shorter than 4 bytes... */
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intf_ErrMsg( "input error: cannot peek() (mpeg_ps)" );
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return( -1 );
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}
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if( *p_peek || *(p_peek + 1) || *(p_peek + 2) != 1 )
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{
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if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
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{
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/* User forced */
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intf_ErrMsg( "input error: this doesn't look like an MPEG PS stream, continuing" );
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}
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else
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{
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intf_WarnMsg( 2, "input: PS plug-in discarded (no startcode)" );
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return( -1 );
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}
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}
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else if( *(p_peek + 3) <= 0xb9 )
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{
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if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
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{
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/* User forced */
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intf_ErrMsg( "input error: this seems to be an elementary stream (ES plug-in ?),");
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intf_ErrMsg( "but continuing" );
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}
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else
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{
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intf_WarnMsg( 2, "input: PS plug-in discarded (ES startcode)" );
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return( -1 );
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}
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}
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if( input_InitStream( p_input, sizeof( stream_ps_data_t ) ) == -1 )
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{
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return( -1 );
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}
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input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
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p_input->stream.p_selected_program =
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p_input->stream.pp_programs[0] ;
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p_input->stream.p_new_program =
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p_input->stream.pp_programs[0] ;
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if( p_input->stream.b_seekable )
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{
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stream_ps_data_t * p_demux_data =
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(stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
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/* Pre-parse the stream to gather stream_descriptor_t. */
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p_input->stream.pp_programs[0]->b_is_ok = 0;
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p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
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while( !p_input->b_die && !p_input->b_error
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&& !p_demux_data->b_has_PSM )
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{
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ssize_t i_result;
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data_packet_t * p_data;
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i_result = input_ReadPS( p_input, &p_data );
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if( i_result == 0 )
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{
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/* EOF */
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vlc_mutex_lock( &p_input->stream.stream_lock );
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p_input->stream.pp_programs[0]->b_is_ok = 1;
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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break;
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}
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else if( i_result == -1 )
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{
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p_input->b_error = 1;
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break;
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}
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input_ParsePS( p_input, p_data );
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input_DeletePacket( p_input->p_method_data, p_data );
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/* File too big. */
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if( p_input->stream.p_selected_area->i_tell >
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INPUT_PREPARSE_LENGTH )
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{
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break;
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}
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}
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p_input->pf_seek( p_input, (off_t)0 );
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input_AccessReinit( p_input );
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vlc_mutex_lock( &p_input->stream.stream_lock );
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if( p_demux_data->b_has_PSM )
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{
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/* (The PSM decoder will care about spawning the decoders) */
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p_input->stream.pp_programs[0]->b_is_ok = 1;
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}
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#ifdef AUTO_SPAWN
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else
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{
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/* (We have to do it ourselves) */
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int i_es;
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/* FIXME: we should do multiple passes in case an audio type
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* is not present */
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for( i_es = 0;
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i_es < p_input->stream.pp_programs[0]->i_es_number;
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i_es++ )
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{
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#define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
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switch( p_es->i_type )
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{
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case MPEG1_VIDEO_ES:
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case MPEG2_VIDEO_ES:
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input_SelectES( p_input, p_es );
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break;
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case MPEG1_AUDIO_ES:
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case MPEG2_AUDIO_ES:
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if( config_GetIntVariable( "input_channel" )
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== (p_es->i_id & 0x1F) ||
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( config_GetIntVariable( "input_channel" ) < 0
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&& !(p_es->i_id & 0x1F) ) )
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switch( config_GetIntVariable( "input_audio" ) )
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{
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case -1:
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case REQUESTED_MPEG:
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input_SelectES( p_input, p_es );
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}
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break;
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case AC3_AUDIO_ES:
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if( config_GetIntVariable( "input_channel" )
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== ((p_es->i_id & 0xF00) >> 8) ||
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( config_GetIntVariable( "input_channel" ) < 0
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&& !((p_es->i_id & 0xF00) >> 8) ) )
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switch( config_GetIntVariable( "input_audio" ) )
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{
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case -1:
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case REQUESTED_AC3:
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input_SelectES( p_input, p_es );
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}
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break;
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case DVD_SPU_ES:
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if( config_GetIntVariable( "input_subtitle" )
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== ((p_es->i_id & 0x1F00) >> 8) )
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{
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input_SelectES( p_input, p_es );
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}
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break;
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case LPCM_AUDIO_ES:
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if( config_GetIntVariable( "input_channel" )
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== ((p_es->i_id & 0x1F00) >> 8) ||
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( config_GetIntVariable( "input_channel" ) < 0
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&& !((p_es->i_id & 0x1F00) >> 8) ) )
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switch( config_GetIntVariable( "input_audio" ) )
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{
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case -1:
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case REQUESTED_LPCM:
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input_SelectES( p_input, p_es );
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}
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break;
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}
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}
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}
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#endif
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if( p_main->b_stats )
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{
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input_DumpStream( p_input );
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}
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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}
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else
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{
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/* The programs will be added when we read them. */
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vlc_mutex_lock( &p_input->stream.stream_lock );
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p_input->stream.i_method = INPUT_METHOD_FILE;
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p_input->stream.pp_programs[0]->b_is_ok = 0;
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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}
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return( 0 );
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}
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/*****************************************************************************
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* PSEnd: frees unused data
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*****************************************************************************/
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static void PSEnd( input_thread_t * p_input )
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{
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}
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/*****************************************************************************
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* PSDemux: reads and demuxes data packets
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*****************************************************************************
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* Returns -1 in case of error, 0 in case of EOF, otherwise the number of
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* packets.
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*****************************************************************************/
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static int PSDemux( input_thread_t * p_input )
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{
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int i;
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for( i = 0; i < PS_READ_ONCE; i++ )
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{
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data_packet_t * p_data;
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ssize_t i_result;
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i_result = input_ReadPS( p_input, &p_data );
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if( i_result <= 0 )
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{
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return( i_result );
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}
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input_DemuxPS( p_input, p_data );
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}
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return( i );
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}
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