plugins/dvd/dvd_demux.c

   1 /* dvd_demux.c: DVD demux functions.
   2  *****************************************************************************
   3  * Copyright (C) 1998-2001 VideoLAN
   4  * $Id: dvd_demux.c,v 1.5 2002/04/25 21:52:42 sam Exp $
   5  *
   6  * Author: Stéphane Borel <stef@via.ecp.fr>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  21  *****************************************************************************/
  22
  23 /*****************************************************************************
  24  * Preamble
  25  *****************************************************************************/
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include <videolan/vlc.h>
  31
  32 #ifdef HAVE_UNISTD_H
  33 #   include <unistd.h>
  34 #endif
  35
  36 #include <fcntl.h>
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <string.h>
  40 #include <errno.h>
  41
  42 #ifdef STRNCASECMP_IN_STRINGS_H
  43 #   include <strings.h>
  44 #endif
  45
  46 #include "stream_control.h"
  47 #include "input_ext-intf.h"
  48 #include "input_ext-dec.h"
  49 #include "input_ext-plugins.h"
  50
  51 /* how many packets DVDDemux will read in each loop */
  52 #define DVD_READ_ONCE 64
  53
  54 /*****************************************************************************
  55  * Local prototypes
  56  *****************************************************************************/
  57
  58 /* called from outside */
  59 static int  DVDRewind       ( struct input_thread_s * );
  60 static int  DVDDemux        ( struct input_thread_s * );
  61 static int  DVDInit         ( struct input_thread_s * );
  62 static void DVDEnd          ( struct input_thread_s * );
  63
  64 void DVDLaunchDecoders( input_thread_t * );
  65
  66 /*****************************************************************************
  67  * Functions exported as capabilities. They are declared as static so that
  68  * we don't pollute the namespace too much.
  69  *****************************************************************************/
  70 void _M( demux_getfunctions)( function_list_t * p_function_list )
  71 {
  72 #define demux p_function_list->functions.demux
  73     demux.pf_init             = DVDInit;
  74     demux.pf_end              = DVDEnd;
  75     demux.pf_demux            = DVDDemux;
  76     demux.pf_rewind           = DVDRewind;
  77 #undef demux
  78 }
  79
  80 /*
  81  * Data demux functions
  82  */
  83
  84 /*****************************************************************************
  85  * DVDInit: initializes DVD structures
  86  *****************************************************************************/
  87 static int DVDInit( input_thread_t * p_input )
  88 {
  89     if( p_input->stream.i_method != INPUT_METHOD_DVD )
  90     {
  91         return -1;
  92     }
  93
  94     vlc_mutex_lock( &p_input->stream.stream_lock );
  95
  96     DVDLaunchDecoders( p_input );
  97
  98     vlc_mutex_unlock( &p_input->stream.stream_lock );
  99
 100     return 0;
 101 }
 102
 103 /*****************************************************************************
 104  * DVDEnd: frees unused data
 105  *****************************************************************************/
 106 static void DVDEnd( input_thread_t * p_input )
 107 {
 108 }
 109
 110 /*****************************************************************************
 111  * DVDDemux
 112  *****************************************************************************/
 113 static int DVDDemux( input_thread_t * p_input )
 114 {
 115     data_packet_t *     p_data;
 116     ssize_t             i_result;
 117     int                 i;
 118
 119     /* Read headers to compute payload length */
 120     for( i = 0 ; i < DVD_READ_ONCE ; i++ )
 121     {
 122         if( ( i_result = input_ReadPS( p_input, &p_data ) ) <= 0)
 123         {
 124             return i_result;
 125         }
 126
 127         input_DemuxPS( p_input, p_data );
 128     }
 129
 130     return i;
 131 }
 132
 133 /*****************************************************************************
 134  * DVDRewind : reads a stream backward
 135  *****************************************************************************/
 136 static int DVDRewind( input_thread_t * p_input )
 137 {
 138     return( -1 );
 139 }