mirror of
https://code.videolan.org/videolan/vlc
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269 lines
8.4 KiB
C
269 lines
8.4 KiB
C
/*****************************************************************************
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* input_es.c: Elementary Stream demux and packet management
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*****************************************************************************
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* Copyright (C) 2001 VideoLAN
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* $Id: input_es.c,v 1.1 2001/04/20 15:02:48 sam Exp $
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*
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* Authors:
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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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#define MODULE_NAME es
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#include "modules_inner.h"
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include "defs.h"
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "config.h"
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#include "common.h"
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#include "threads.h"
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#include "mtime.h"
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#include "tests.h"
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#include "intf_msg.h"
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#include "main.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.h"
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#include "input_es.h"
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#include "mpeg_system.h"
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#include "debug.h"
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#include "modules.h"
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int ESProbe ( probedata_t * );
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static int ESRead ( struct input_thread_s *,
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data_packet_t * p_packets[INPUT_READ_ONCE] );
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static void ESInit ( struct input_thread_s * );
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static void ESEnd ( struct input_thread_s * );
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static void ESSeek ( struct input_thread_s *, off_t );
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static void ESDemux ( struct input_thread_s *, struct data_packet_s * );
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static struct pes_packet_s * NewPES ( void * );
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static struct data_packet_s * NewPacket ( void *, size_t );
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static void DeletePacket( void *, struct data_packet_s * );
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static void DeletePES ( void *, struct pes_packet_s * );
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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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void _M( input_getfunctions )( function_list_t * p_function_list )
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{
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#define input p_function_list->functions.input
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p_function_list->pf_probe = ESProbe;
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input.pf_init = ESInit;
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input.pf_open = input_FileOpen;
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input.pf_close = input_FileClose;
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input.pf_end = ESEnd;
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input.pf_set_area = NULL;
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input.pf_read = ESRead;
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input.pf_demux = ESDemux;
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input.pf_new_packet = NewPacket;
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input.pf_new_pes = NewPES;
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input.pf_delete_packet = DeletePacket;
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input.pf_delete_pes = DeletePES;
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input.pf_rewind = NULL;
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input.pf_seek = ESSeek;
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#undef input
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}
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/*
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* Data reading functions
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*/
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/*****************************************************************************
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* ESProbe: verifies that the stream is a ES stream
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*****************************************************************************/
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static int ESProbe( probedata_t *p_data )
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{
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input_thread_t * p_input = (input_thread_t *)p_data;
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char * psz_name = p_input->p_source;
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int i_handle;
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int i_score = 10;
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if( TestMethod( INPUT_METHOD_VAR, "es" ) )
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{
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return( 999 );
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}
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i_handle = open( psz_name, 0 );
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if( i_handle == -1 )
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{
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return( 0 );
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}
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close( i_handle );
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return( i_score );
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}
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/*****************************************************************************
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* ESInit: initializes ES structures
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*****************************************************************************/
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static void ESInit( input_thread_t * p_input )
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{
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thread_es_data_t * p_method;
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if( (p_method =
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(thread_es_data_t *)malloc( sizeof(thread_es_data_t) )) == NULL )
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{
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intf_ErrMsg( "Out of memory" );
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p_input->b_error = 1;
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return;
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}
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p_input->p_plugin_data = (void *)p_method;
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/* XXX */
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}
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/*****************************************************************************
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* ESEnd: frees unused data
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*****************************************************************************/
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static void ESEnd( input_thread_t * p_input )
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{
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/* XXX */
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free( p_input->p_plugin_data );
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}
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/*****************************************************************************
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* SafeRead: reads a chunk of stream and correctly detects errors
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*****************************************************************************/
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static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
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size_t i_len )
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{
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thread_es_data_t * p_method;
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int i_error;
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p_method = (thread_es_data_t *)p_input->p_plugin_data;
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while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
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{
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if( feof( p_method->stream ) )
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{
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return( 1 );
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}
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if( (i_error = ferror( p_method->stream )) )
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{
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intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
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return( -1 );
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}
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}
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vlc_mutex_lock( &p_input->stream.stream_lock );
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p_input->stream.p_selected_area->i_tell += i_len;
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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return( 0 );
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}
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/*****************************************************************************
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* ESRead: reads data packets
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*****************************************************************************
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* Returns -1 in case of error, 0 if everything went well, and 1 in case of
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* EOF.
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*****************************************************************************/
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static int ESRead( input_thread_t * p_input,
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data_packet_t * pp_packets[INPUT_READ_ONCE] )
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{
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/* XXX */
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return( 0 );
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}
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/*****************************************************************************
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* ESSeek: changes the stream position indicator
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*****************************************************************************/
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static void ESSeek( input_thread_t * p_input, off_t i_position )
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{
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thread_es_data_t * p_method;
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p_method = (thread_es_data_t *)p_input->p_plugin_data;
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/* A little bourrin but should work for a while --Meuuh */
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fseeko( p_method->stream, i_position, SEEK_SET );
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p_input->stream.p_selected_area->i_tell = i_position;
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}
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void ESDemux( input_thread_t * p_input, data_packet_t * p_data )
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{
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/* XXX */
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}
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/*
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* Packet management utilities
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*/
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/*****************************************************************************
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* NewPacket: allocates a data packet
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*****************************************************************************/
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static struct data_packet_s * NewPacket( void * p_packet_cache,
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size_t l_size )
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{
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/* XXX */
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return NULL;
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}
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/*****************************************************************************
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* NewPES: allocates a pes packet
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*****************************************************************************/
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static pes_packet_t * NewPES( void * p_packet_cache )
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{
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/* XXX */
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return NULL;
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}
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/*****************************************************************************
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* DeletePacket: deletes a data packet
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*****************************************************************************/
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static void DeletePacket( void * p_packet_cache,
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data_packet_t * p_data )
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{
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/* XXX */
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}
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/*****************************************************************************
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* DeletePES: deletes a PES packet and associated data packets
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*****************************************************************************/
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static void DeletePES( void * p_packet_cache, pes_packet_t * p_pes )
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{
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/* XXX */
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}
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