git.sesse.net Git - vlc/blob - modules/demux/mpeg/ps.c

   1 /*****************************************************************************
   2  * ps.c : Program Stream input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2001 VideoLAN
   5  * $Id: ps.c,v 1.7 2002/12/06 16:34:07 sam Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28 #include <string.h>                                              /* strdup() */
  29
  30 #include <vlc/vlc.h>
  31 #include <vlc/input.h>
  32
  33 #include "system.h"
  34
  35 /*****************************************************************************
  36  * Constants
  37  *****************************************************************************/
  38 #define PS_READ_ONCE 50
  39
  40 /*****************************************************************************
  41  * Private structure
  42  *****************************************************************************/
  43 struct demux_sys_t
  44 {
  45     module_t *   p_module;
  46     mpeg_demux_t mpeg;
  47 };
  48
  49 /*****************************************************************************
  50  * Local prototypes
  51  *****************************************************************************/
  52 static int  Activate   ( vlc_object_t * );
  53 static void Deactivate ( vlc_object_t * );
  54 static int  Demux      ( input_thread_t * );
  55
  56 /*****************************************************************************
  57  * Module descriptor
  58  *****************************************************************************/
  59 vlc_module_begin();
  60     set_description( _("ISO 13818-1 MPEG Program Stream input") );
  61     set_capability( "demux", 1 );
  62     set_callbacks( Activate, Deactivate );
  63     add_shortcut( "ps" );
  64 vlc_module_end();
  65
  66 /*****************************************************************************
  67  * Activate: initialize PS structures
  68  *****************************************************************************/
  69 static int Activate( vlc_object_t * p_this )
  70 {
  71     input_thread_t *    p_input = (input_thread_t *)p_this;
  72     demux_sys_t *       p_demux;
  73     byte_t *            p_peek;
  74
  75     /* Set the demux function */
  76     p_input->pf_demux = Demux;
  77
  78     /* Initialize access plug-in structures. */
  79     if( p_input->i_mtu == 0 )
  80     {
  81         /* Improve speed. */
  82         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
  83     }
  84
  85     /* Have a peep at the show. */
  86     if( input_Peek( p_input, &p_peek, 4 ) < 4 )
  87     {
  88         /* Stream shorter than 4 bytes... */
  89         msg_Err( p_input, "cannot peek()" );
  90         return -1;
  91     }
  92
  93     if( *p_peek || *(p_peek + 1) || *(p_peek + 2) != 1 )
  94     {
  95         if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
  96         {
  97             /* User forced */
  98             msg_Err( p_input, "this does not look like an MPEG PS stream, continuing" );
  99         }
 100         else
 101         {
 102             msg_Warn( p_input, "this does not look like an MPEG PS stream, "
 103                                "but continuing anyway" );
 104         }
 105     }
 106     else if( *(p_peek + 3) <= 0xb9 )
 107     {
 108         if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "ps", 3 ) )
 109         {
 110             /* User forced */
 111             msg_Err( p_input, "this seems to be an elementary stream (ES module?), but continuing" );
 112         }
 113         else
 114         {
 115             msg_Warn( p_input, "this seems to be an elementary stream (ES module?), but continuing" );
 116         }
 117     }
 118
 119     p_demux = p_input->p_demux_data = malloc( sizeof(demux_sys_t ) );
 120     if( p_demux == NULL )
 121     {
 122         return -1;
 123     }
 124
 125     p_input->p_private = (void*)&p_demux->mpeg;
 126     p_demux->p_module = module_Need( p_input, "mpeg-system", NULL );
 127     if( p_demux->p_module == NULL )
 128     {
 129         free( p_input->p_demux_data );
 130         return -1;
 131     }
 132
 133     if( input_InitStream( p_input, sizeof( stream_ps_data_t ) ) == -1 )
 134     {
 135         module_Unneed( p_input, p_demux->p_module );
 136         free( p_input->p_demux_data );
 137         return -1;
 138     }
 139     input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
 140
 141     p_input->stream.p_selected_program =
 142             p_input->stream.pp_programs[0] ;
 143
 144     if( p_input->stream.b_seekable )
 145     {
 146         stream_ps_data_t * p_demux_data =
 147              (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
 148
 149         /* Pre-parse the stream to gather stream_descriptor_t. */
 150         p_input->stream.pp_programs[0]->b_is_ok = 0;
 151         p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
 152
 153         while( !p_input->b_die && !p_input->b_error
 154                 && !p_demux_data->b_has_PSM )
 155         {
 156             ssize_t             i_result;
 157             data_packet_t *     p_data;
 158
 159             i_result = p_demux->mpeg.pf_read_ps( p_input, &p_data );
 160
 161             if( i_result == 0 )
 162             {
 163                 /* EOF */
 164                 vlc_mutex_lock( &p_input->stream.stream_lock );
 165                 p_input->stream.pp_programs[0]->b_is_ok = 1;
 166                 vlc_mutex_unlock( &p_input->stream.stream_lock );
 167                 break;
 168             }
 169             else if( i_result == -1 )
 170             {
 171                 p_input->b_error = 1;
 172                 break;
 173             }
 174
 175             p_demux->mpeg.pf_parse_ps( p_input, p_data );
 176             input_DeletePacket( p_input->p_method_data, p_data );
 177
 178             /* File too big. */
 179             if( p_input->stream.p_selected_area->i_tell >
 180                                                     INPUT_PREPARSE_LENGTH )
 181             {
 182                 break;
 183             }
 184         }
 185         input_AccessReinit( p_input );
 186         p_input->pf_seek( p_input, (off_t)0 );
 187         vlc_mutex_lock( &p_input->stream.stream_lock );
 188
 189         if( p_demux_data->b_has_PSM )
 190         {
 191             /* (The PSM decoder will care about spawning the decoders) */
 192             p_input->stream.pp_programs[0]->b_is_ok = 1;
 193         }
 194 #ifdef AUTO_SPAWN
 195         else
 196         {
 197             /* (We have to do it ourselves) */
 198             unsigned int i_es;
 199
 200             /* FIXME: we should do multiple passes in case an audio type
 201              * is not present */
 202             for( i_es = 0;
 203                  i_es < p_input->stream.pp_programs[0]->i_es_number;
 204                  i_es++ )
 205             {
 206 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
 207                 switch( p_es->i_fourcc )
 208                 {
 209                     case VLC_FOURCC('m','p','g','v'):
 210                         input_SelectES( p_input, p_es );
 211                         break;
 212
 213                     case VLC_FOURCC('m','p','g','a'):
 214                         if( config_GetInt( p_input, "audio-channel" )
 215                                 == (p_es->i_id & 0x1F) ||
 216                            ( config_GetInt( p_input, "audio-channel" ) < 0
 217                               && !(p_es->i_id & 0x1F) ) )
 218                         switch( config_GetInt( p_input, "audio-type" ) )
 219                         {
 220                         case -1:
 221                         case REQUESTED_MPEG:
 222                             input_SelectES( p_input, p_es );
 223                         }
 224                         break;
 225
 226                     case VLC_FOURCC('a','5','2',' '):
 227                     case VLC_FOURCC('a','5','2','b'):
 228                         if( config_GetInt( p_input, "audio-channel" )
 229                                 == ((p_es->i_id & 0xF00) >> 8) ||
 230                            ( config_GetInt( p_input, "audio-channel" ) < 0
 231                               && !((p_es->i_id & 0xF00) >> 8) ) )
 232                         switch( config_GetInt( p_input, "audio-type" ) )
 233                         {
 234                         case -1:
 235                         case REQUESTED_A52:
 236                             input_SelectES( p_input, p_es );
 237                         }
 238                         break;
 239
 240                     case VLC_FOURCC('s','p','u',' '):
 241                     case VLC_FOURCC('s','p','u','b'):
 242                         if( config_GetInt( p_input, "spu-channel" )
 243                                 == ((p_es->i_id & 0x1F00) >> 8) )
 244                         {
 245                             input_SelectES( p_input, p_es );
 246                         }
 247                         break;
 248
 249                     case VLC_FOURCC('l','p','c','m'):
 250                     case VLC_FOURCC('l','p','c','b'):
 251                         if( config_GetInt( p_input, "audio-channel" )
 252                                 == ((p_es->i_id & 0x1F00) >> 8) ||
 253                            ( config_GetInt( p_input, "audio-channel" ) < 0
 254                               && !((p_es->i_id & 0x1F00) >> 8) ) )
 255                         switch( config_GetInt( p_input, "audio-type" ) )
 256                         {
 257                         case -1:
 258                         case REQUESTED_LPCM:
 259                             input_SelectES( p_input, p_es );
 260                         }
 261                         break;
 262                 }
 263 #undef p_es
 264             }
 265         }
 266 #endif
 267         input_DumpStream( p_input );
 268         vlc_mutex_unlock( &p_input->stream.stream_lock );
 269     }
 270     else
 271     {
 272         /* The programs will be added when we read them. */
 273         vlc_mutex_lock( &p_input->stream.stream_lock );
 274         p_input->stream.pp_programs[0]->b_is_ok = 0;
 275         vlc_mutex_unlock( &p_input->stream.stream_lock );
 276     }
 277
 278     return 0;
 279 }
 280
 281 /*****************************************************************************
 282  * Deactivate: deinitialize PS structures
 283  *****************************************************************************/
 284 static void Deactivate( vlc_object_t * p_this )
 285 {
 286     input_thread_t *    p_input = (input_thread_t *)p_this;
 287
 288     module_Unneed( p_input, p_input->p_demux_data->p_module );
 289     free( p_input->p_demux_data );
 290 }
 291
 292 /*****************************************************************************
 293  * Demux: reads and demuxes data packets
 294  *****************************************************************************
 295  * Returns -1 in case of error, 0 in case of EOF, otherwise the number of
 296  * packets.
 297  *****************************************************************************/
 298 static int Demux( input_thread_t * p_input )
 299 {
 300     int i;
 301
 302     for( i = 0; i < PS_READ_ONCE; i++ )
 303     {
 304         data_packet_t *     p_data;
 305         ssize_t             i_result;
 306         i_result = p_input->p_demux_data->mpeg.pf_read_ps( p_input, &p_data );
 307
 308         if( i_result <= 0 )
 309         {
 310             return i_result;
 311         }
 312
 313         p_input->p_demux_data->mpeg.pf_demux_ps( p_input, p_data );
 314     }
 315
 316     return i;
 317 }
 318