src/input/demux.c

   1 /*****************************************************************************
   2  * demux.c
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Author: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 #ifdef HAVE_CONFIG_H
  25 # include "config.h"
  26 #endif
  27
  28 #include "demux.h"
  29 #include <libvlc.h>
  30 #include <vlc_codec.h>
  31 #include <vlc_meta.h>
  32 #include <vlc_url.h>
  33 #include <vlc_modules.h>
  34
  35 static bool SkipID3Tag( demux_t * );
  36 static bool SkipAPETag( demux_t *p_demux );
  37
  38 /* Decode URL (which has had its scheme stripped earlier) to a file path. */
  39 /* XXX: evil code duplication from access.c */
  40 static char *get_path(const char *location)
  41 {
  42     char *url, *path;
  43
  44     /* Prepending "file://" is a bit hackish. But then again, we do not want
  45      * to hard-code the list of schemes that use file paths in make_path().
  46      */
  47     if (asprintf(&url, "file://%s", location) == -1)
  48         return NULL;
  49
  50     path = make_path (url);
  51     free (url);
  52     return path;
  53 }
  54
  55 #undef demux_New
  56 /*****************************************************************************
  57  * demux_New:
  58  *  if s is NULL then load a access_demux
  59  *****************************************************************************/
  60 demux_t *demux_New( vlc_object_t *p_obj, input_thread_t *p_parent_input,
  61                     const char *psz_access, const char *psz_demux,
  62                     const char *psz_location,
  63                     stream_t *s, es_out_t *out, bool b_quick )
  64 {
  65     demux_t *p_demux = vlc_custom_create( p_obj, sizeof( *p_demux ), "demux" );
  66     const char *psz_module;
  67
  68     if( p_demux == NULL ) return NULL;
  69
  70     p_demux->p_input = p_parent_input;
  71
  72     /* Parse URL */
  73     p_demux->psz_access = strdup( psz_access );
  74     p_demux->psz_demux  = strdup( psz_demux );
  75     p_demux->psz_location = strdup( psz_location );
  76     p_demux->psz_file = get_path( psz_location );
  77
  78     /* Take into account "demux" to be able to do :demux=dump */
  79     if( *p_demux->psz_demux == '\0' )
  80     {
  81         free( p_demux->psz_demux );
  82         p_demux->psz_demux = var_GetNonEmptyString( p_obj, "demux" );
  83         if( p_demux->psz_demux == NULL )
  84             p_demux->psz_demux = strdup( "" );
  85     }
  86
  87     if( !b_quick )
  88         msg_Dbg( p_obj, "creating demux: access='%s' demux='%s' "
  89                  "location='%s' file='%s'",
  90                  p_demux->psz_access, p_demux->psz_demux,
  91                  p_demux->psz_location, p_demux->psz_file );
  92
  93     p_demux->s          = s;
  94     p_demux->out        = out;
  95
  96     p_demux->pf_demux   = NULL;
  97     p_demux->pf_control = NULL;
  98     p_demux->p_sys      = NULL;
  99     p_demux->info.i_update = 0;
 100     p_demux->info.i_title  = 0;
 101     p_demux->info.i_seekpoint = 0;
 102
 103     if( s ) psz_module = p_demux->psz_demux;
 104     else psz_module = p_demux->psz_access;
 105
 106     const char *psz_ext;
 107
 108     if( s && *psz_module == '\0'
 109      && p_demux->psz_file != NULL
 110      && (psz_ext = strrchr( p_demux->psz_file, '.' )) )
 111     {
 112        /* XXX: add only file without any problem here and with strong detection.
 113         *  - no .mp3, .a52, ...
 114         *  - wav can't be added 'cause of a52 and dts in them as raw audio
 115          */
 116          static const struct { char ext[5]; char demux[9]; } exttodemux[] =
 117          {
 118             { "aiff", "aiff" },
 119             { "asf",  "asf" }, { "wmv",  "asf" }, { "wma",  "asf" },
 120             { "avi",  "avi" },
 121             { "au",   "au" },
 122             { "flac", "flac" },
 123             { "dv",   "dv" },
 124             { "drc",  "dirac" },
 125             { "m3u",  "m3u" },
 126             { "m3u8", "m3u8" },
 127             { "mkv",  "mkv" }, { "mka",  "mkv" }, { "mks",  "mkv" },
 128             { "mp4",  "mp4" }, { "m4a",  "mp4" }, { "mov",  "mp4" }, { "moov", "mp4" },
 129             { "nsv",  "nsv" },
 130             { "ogg",  "ogg" }, { "ogm",  "ogg" }, /* legacy Ogg */
 131             { "oga",  "ogg" }, { "spx",  "ogg" }, { "ogv", "ogg" },
 132             { "ogx",  "ogg" }, /*RFC5334*/
 133             { "opus", "ogg" }, /*draft-terriberry-oggopus-01*/
 134             { "pva",  "pva" },
 135             { "rm",   "avformat" },
 136             { "m4v",  "m4v" },
 137             { "h264", "h264" },
 138             { "voc",  "voc" },
 139             { "mid",  "smf" }, { "rmi",  "smf" }, { "kar", "smf" },
 140             { "",  "" },
 141         };
 142         /* Here, we don't mind if it does not work, it must be quick */
 143         static const struct { char ext[4]; char demux[5]; } exttodemux_quick[] =
 144         {
 145             { "mp3", "mpga" },
 146             { "ogg", "ogg" },
 147             { "wma", "asf" },
 148             { "", "" }
 149         };
 150
 151         psz_ext++; // skip '.'
 152
 153         if( !b_quick )
 154         {
 155             for( unsigned i = 0; exttodemux[i].ext[0]; i++ )
 156             {
 157                 if( !strcasecmp( psz_ext, exttodemux[i].ext ) )
 158                 {
 159                     psz_module = exttodemux[i].demux;
 160                     break;
 161                 }
 162             }
 163         }
 164         else
 165         {
 166             for( unsigned i = 0; exttodemux_quick[i].ext[0]; i++ )
 167             {
 168                 if( !strcasecmp( psz_ext, exttodemux_quick[i].ext ) )
 169                 {
 170                     psz_module = exttodemux_quick[i].demux;
 171                     break;
 172                 }
 173             }
 174
 175         }
 176     }
 177
 178     if( s )
 179     {
 180         /* ID3/APE tags will mess-up demuxer probing so we skip it here.
 181          * ID3/APE parsers will called later on in the demuxer to access the
 182          * skipped info. */
 183         while (SkipID3Tag( p_demux ))
 184           ;
 185         SkipAPETag( p_demux );
 186
 187         p_demux->p_module =
 188             module_need( p_demux, "demux", psz_module,
 189                          !strcmp( psz_module, p_demux->psz_demux ) );
 190     }
 191     else
 192     {
 193         p_demux->p_module =
 194             module_need( p_demux, "access_demux", psz_module,
 195                          !strcmp( psz_module, p_demux->psz_access ) );
 196     }
 197
 198     if( p_demux->p_module == NULL )
 199     {
 200         free( p_demux->psz_file );
 201         free( p_demux->psz_location );
 202         free( p_demux->psz_demux );
 203         free( p_demux->psz_access );
 204         vlc_object_release( p_demux );
 205         return NULL;
 206     }
 207
 208     return p_demux;
 209 }
 210
 211 /*****************************************************************************
 212  * demux_Delete:
 213  *****************************************************************************/
 214 void demux_Delete( demux_t *p_demux )
 215 {
 216     module_unneed( p_demux, p_demux->p_module );
 217
 218     free( p_demux->psz_file );
 219     free( p_demux->psz_location );
 220     free( p_demux->psz_demux );
 221     free( p_demux->psz_access );
 222
 223     vlc_object_release( p_demux );
 224 }
 225
 226 /*****************************************************************************
 227  * demux_GetParentInput:
 228  *****************************************************************************/
 229 input_thread_t * demux_GetParentInput( demux_t *p_demux )
 230 {
 231     return p_demux->p_input ? vlc_object_hold((vlc_object_t*)p_demux->p_input) : NULL;
 232 }
 233
 234
 235 /*****************************************************************************
 236  * demux_vaControlHelper:
 237  *****************************************************************************/
 238 int demux_vaControlHelper( stream_t *s,
 239                             int64_t i_start, int64_t i_end,
 240                             int64_t i_bitrate, int i_align,
 241                             int i_query, va_list args )
 242 {
 243     int64_t i_tell;
 244     double  f, *pf;
 245     int64_t i64, *pi64;
 246
 247     if( i_end < 0 )    i_end   = stream_Size( s );
 248     if( i_start < 0 )  i_start = 0;
 249     if( i_align <= 0 ) i_align = 1;
 250     i_tell = stream_Tell( s );
 251
 252     switch( i_query )
 253     {
 254         case DEMUX_GET_LENGTH:
 255             pi64 = (int64_t*)va_arg( args, int64_t * );
 256             if( i_bitrate > 0 && i_end > i_start )
 257             {
 258                 *pi64 = INT64_C(8000000) * (i_end - i_start) / i_bitrate;
 259                 return VLC_SUCCESS;
 260             }
 261             return VLC_EGENERIC;
 262
 263         case DEMUX_GET_TIME:
 264             pi64 = (int64_t*)va_arg( args, int64_t * );
 265             if( i_bitrate > 0 && i_tell >= i_start )
 266             {
 267                 *pi64 = INT64_C(8000000) * (i_tell - i_start) / i_bitrate;
 268                 return VLC_SUCCESS;
 269             }
 270             return VLC_EGENERIC;
 271
 272         case DEMUX_GET_POSITION:
 273             pf = (double*)va_arg( args, double * );
 274             if( i_start < i_end )
 275             {
 276                 *pf = (double)( i_tell - i_start ) /
 277                       (double)( i_end  - i_start );
 278                 return VLC_SUCCESS;
 279             }
 280             return VLC_EGENERIC;
 281
 282
 283         case DEMUX_SET_POSITION:
 284             f = (double)va_arg( args, double );
 285             if( i_start < i_end && f >= 0.0 && f <= 1.0 )
 286             {
 287                 int64_t i_block = (f * ( i_end - i_start )) / i_align;
 288
 289                 if( stream_Seek( s, i_start + i_block * i_align ) )
 290                 {
 291                     return VLC_EGENERIC;
 292                 }
 293                 return VLC_SUCCESS;
 294             }
 295             return VLC_EGENERIC;
 296
 297         case DEMUX_SET_TIME:
 298             i64 = (int64_t)va_arg( args, int64_t );
 299             if( i_bitrate > 0 && i64 >= 0 )
 300             {
 301                 int64_t i_block = i64 * i_bitrate / INT64_C(8000000) / i_align;
 302                 if( stream_Seek( s, i_start + i_block * i_align ) )
 303                 {
 304                     return VLC_EGENERIC;
 305                 }
 306                 return VLC_SUCCESS;
 307             }
 308             return VLC_EGENERIC;
 309
 310         case DEMUX_GET_PTS_DELAY:
 311         case DEMUX_GET_FPS:
 312         case DEMUX_GET_META:
 313         case DEMUX_HAS_UNSUPPORTED_META:
 314         case DEMUX_SET_NEXT_DEMUX_TIME:
 315         case DEMUX_GET_TITLE_INFO:
 316         case DEMUX_SET_GROUP:
 317         case DEMUX_GET_ATTACHMENTS:
 318         case DEMUX_CAN_RECORD:
 319         case DEMUX_SET_RECORD_STATE:
 320             return VLC_EGENERIC;
 321
 322         default:
 323             msg_Err( s, "unknown query in demux_vaControlDefault" );
 324             return VLC_EGENERIC;
 325     }
 326 }
 327
 328 /****************************************************************************
 329  * Utility functions
 330  ****************************************************************************/
 331 decoder_t *demux_PacketizerNew( demux_t *p_demux, es_format_t *p_fmt, const char *psz_msg )
 332 {
 333     decoder_t *p_packetizer;
 334     p_packetizer = vlc_custom_create( p_demux, sizeof( *p_packetizer ),
 335                                       "demux packetizer" );
 336     if( !p_packetizer )
 337     {
 338         es_format_Clean( p_fmt );
 339         return NULL;
 340     }
 341     p_fmt->b_packetized = false;
 342
 343     p_packetizer->pf_decode_audio = NULL;
 344     p_packetizer->pf_decode_video = NULL;
 345     p_packetizer->pf_decode_sub = NULL;
 346     p_packetizer->pf_packetize = NULL;
 347
 348     p_packetizer->fmt_in = *p_fmt;
 349     es_format_Init( &p_packetizer->fmt_out, UNKNOWN_ES, 0 );
 350
 351     p_packetizer->p_module = module_need( p_packetizer, "packetizer", NULL, false );
 352     if( !p_packetizer->p_module )
 353     {
 354         es_format_Clean( p_fmt );
 355         vlc_object_release( p_packetizer );
 356         msg_Err( p_demux, "cannot find packetizer for %s", psz_msg );
 357         return NULL;
 358     }
 359
 360     return p_packetizer;
 361 }
 362
 363 void demux_PacketizerDestroy( decoder_t *p_packetizer )
 364 {
 365     if( p_packetizer->p_module )
 366         module_unneed( p_packetizer, p_packetizer->p_module );
 367     es_format_Clean( &p_packetizer->fmt_in );
 368     if( p_packetizer->p_description )
 369         vlc_meta_Delete( p_packetizer->p_description );
 370     vlc_object_release( p_packetizer );
 371 }
 372
 373 static bool SkipID3Tag( demux_t *p_demux )
 374 {
 375     const uint8_t *p_peek;
 376     uint8_t version, revision;
 377     int i_size;
 378     int b_footer;
 379
 380     if( !p_demux->s )
 381         return false;
 382
 383     /* Get 10 byte id3 header */
 384     if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
 385         return false;
 386
 387     if( memcmp( p_peek, "ID3", 3 ) )
 388         return false;
 389
 390     version = p_peek[3];
 391     revision = p_peek[4];
 392     b_footer = p_peek[5] & 0x10;
 393     i_size = (p_peek[6]<<21) + (p_peek[7]<<14) + (p_peek[8]<<7) + p_peek[9];
 394
 395     if( b_footer ) i_size += 10;
 396     i_size += 10;
 397
 398     /* Skip the entire tag */
 399     stream_Read( p_demux->s, NULL, i_size );
 400
 401     msg_Dbg( p_demux, "ID3v2.%d revision %d tag found, skipping %d bytes",
 402              version, revision, i_size );
 403     return true;
 404 }
 405 static bool SkipAPETag( demux_t *p_demux )
 406 {
 407     const uint8_t *p_peek;
 408     int i_version;
 409     int i_size;
 410     uint32_t flags;
 411
 412     if( !p_demux->s )
 413         return false;
 414
 415     /* Get 32 byte ape header */
 416     if( stream_Peek( p_demux->s, &p_peek, 32 ) < 32 )
 417         return false;
 418
 419     if( memcmp( p_peek, "APETAGEX", 8 ) )
 420         return false;
 421
 422     i_version = GetDWLE( &p_peek[8] );
 423     flags = GetDWLE( &p_peek[8+4+4] );
 424     if( ( i_version != 1000 && i_version != 2000 ) || !( flags & (1<<29) ) )
 425         return false;
 426
 427     i_size = GetDWLE( &p_peek[8+4] ) + ( (flags&(1<<30)) ? 32 : 0 );
 428
 429     /* Skip the entire tag */
 430     stream_Read( p_demux->s, NULL, i_size );
 431
 432     msg_Dbg( p_demux, "AP2 v%d tag found, skipping %d bytes",
 433              i_version/1000, i_size );
 434     return true;
 435 }
 436