src/input/demux.c

   1 /*****************************************************************************
   2  * demux.c
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 the VideoLAN team
   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
  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., 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
  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     static const char typename[] = "demux";
  66     demux_t *p_demux = vlc_custom_create( p_obj, sizeof( *p_demux ),
  67                                           VLC_OBJECT_GENERIC, typename );
  68     const char *psz_module;
  69
  70     if( p_demux == NULL ) return NULL;
  71
  72     p_demux->p_input = p_parent_input;
  73
  74     /* Parse URL */
  75     p_demux->psz_access = strdup( psz_access );
  76     p_demux->psz_demux  = strdup( psz_demux );
  77     p_demux->psz_location = strdup( psz_location );
  78     p_demux->psz_file = get_path( psz_location );
  79
  80     /* Take into account "demux" to be able to do :demux=dump */
  81     if( p_demux->psz_demux && *p_demux->psz_demux == '\0' )
  82     {
  83         free( p_demux->psz_demux );
  84         p_demux->psz_demux = var_GetNonEmptyString( p_obj, "demux" );
  85         if( p_demux->psz_demux == NULL )
  86             p_demux->psz_demux = strdup( "" );
  87     }
  88
  89     if( !b_quick )
  90         msg_Dbg( p_obj, "creating demux: access='%s' demux='%s' "
  91                  "location='%s' file='%s'",
  92                  p_demux->psz_access, p_demux->psz_demux,
  93                  p_demux->psz_location, p_demux->psz_file );
  94
  95     p_demux->s          = s;
  96     p_demux->out        = out;
  97
  98     p_demux->pf_demux   = NULL;
  99     p_demux->pf_control = NULL;
 100     p_demux->p_sys      = NULL;
 101     p_demux->info.i_update = 0;
 102     p_demux->info.i_title  = 0;
 103     p_demux->info.i_seekpoint = 0;
 104
 105     if( s ) psz_module = p_demux->psz_demux;
 106     else psz_module = p_demux->psz_access;
 107
 108     const char *psz_ext;
 109
 110     if( s && *psz_module == '\0'
 111      && p_demux->psz_file != NULL
 112      && (psz_ext = strrchr( p_demux->psz_file, '.' )) )
 113     {
 114        /* XXX: add only file without any problem here and with strong detection.
 115         *  - no .mp3, .a52, ... (aac is added as it works only by file ext
 116         *     anyway
 117         *  - wav can't be added 'cause of a52 and dts in them as raw audio
 118          */
 119          static const struct { char ext[5]; char demux[9]; } exttodemux[] =
 120          {
 121             { "aac",  "aac" },
 122             { "aiff", "aiff" },
 123             { "asf",  "asf" }, { "wmv",  "asf" }, { "wma",  "asf" },
 124             { "avi",  "avi" },
 125             { "au",   "au" },
 126             { "flac", "flac" },
 127             { "dv",   "dv" },
 128             { "drc",  "dirac" },
 129             { "m3u",  "m3u" },
 130             { "m3u8", "m3u8" },
 131             { "mkv",  "mkv" }, { "mka",  "mkv" }, { "mks",  "mkv" },
 132             { "mp4",  "mp4" }, { "m4a",  "mp4" }, { "mov",  "mp4" }, { "moov", "mp4" },
 133             { "nsv",  "nsv" },
 134             { "ogg",  "ogg" }, { "ogm",  "ogg" }, /* legacy Ogg */
 135             { "oga",  "ogg" }, { "spx",  "ogg" }, { "ogv", "ogg" },
 136             { "ogx",  "ogg" }, /*RFC5334*/
 137             { "pva",  "pva" },
 138             { "rm",   "rm" },
 139             { "m4v",  "m4v" },
 140             { "h264", "h264" },
 141             { "voc",  "voc" },
 142             { "mid",  "smf" }, { "rmi",  "smf" },
 143             { "",  "" },
 144         };
 145         /* Here, we don't mind if it does not work, it must be quick */
 146         static const struct { char ext[4]; char demux[5]; } exttodemux_quick[] =
 147         {
 148             { "mp3", "mpga" },
 149             { "ogg", "ogg" },
 150             { "wma", "asf" },
 151             { "", "" }
 152         };
 153
 154         psz_ext++; // skip '.'
 155
 156         if( !b_quick )
 157         {
 158             for( unsigned i = 0; exttodemux[i].ext[0]; i++ )
 159             {
 160                 if( !strcasecmp( psz_ext, exttodemux[i].ext ) )
 161                 {
 162                     psz_module = exttodemux[i].demux;
 163                     break;
 164                 }
 165             }
 166         }
 167         else
 168         {
 169             for( unsigned i = 0; exttodemux_quick[i].ext[0]; i++ )
 170             {
 171                 if( !strcasecmp( psz_ext, exttodemux_quick[i].ext ) )
 172                 {
 173                     psz_module = exttodemux_quick[i].demux;
 174                     break;
 175                 }
 176             }
 177
 178         }
 179     }
 180
 181     /* Before module_need (for var_Create...) */
 182     vlc_object_attach( p_demux, p_obj );
 183
 184     if( s )
 185     {
 186         /* ID3/APE tags will mess-up demuxer probing so we skip it here.
 187          * ID3/APE parsers will called later on in the demuxer to access the
 188          * skipped info. */
 189         if( !SkipID3Tag( p_demux ) )
 190             SkipAPETag( p_demux );
 191
 192         p_demux->p_module =
 193             module_need( p_demux, "demux", psz_module,
 194                          !strcmp( psz_module, p_demux->psz_demux ) );
 195     }
 196     else
 197     {
 198         p_demux->p_module =
 199             module_need( p_demux, "access_demux", psz_module,
 200                          !strcmp( psz_module, p_demux->psz_access ) );
 201     }
 202
 203     if( p_demux->p_module == NULL )
 204     {
 205         free( p_demux->psz_file );
 206         free( p_demux->psz_location );
 207         free( p_demux->psz_demux );
 208         free( p_demux->psz_access );
 209         vlc_object_release( p_demux );
 210         return NULL;
 211     }
 212
 213     return p_demux;
 214 }
 215
 216 /*****************************************************************************
 217  * demux_Delete:
 218  *****************************************************************************/
 219 void demux_Delete( demux_t *p_demux )
 220 {
 221     module_unneed( p_demux, p_demux->p_module );
 222
 223     free( p_demux->psz_file );
 224     free( p_demux->psz_location );
 225     free( p_demux->psz_demux );
 226     free( p_demux->psz_access );
 227
 228     vlc_object_release( p_demux );
 229 }
 230
 231 /*****************************************************************************
 232  * demux_GetParentInput:
 233  *****************************************************************************/
 234 input_thread_t * demux_GetParentInput( demux_t *p_demux )
 235 {
 236     return p_demux->p_input ? vlc_object_hold((vlc_object_t*)p_demux->p_input) : NULL;
 237 }
 238
 239
 240 /*****************************************************************************
 241  * demux_vaControlHelper:
 242  *****************************************************************************/
 243 int demux_vaControlHelper( stream_t *s,
 244                             int64_t i_start, int64_t i_end,
 245                             int64_t i_bitrate, int i_align,
 246                             int i_query, va_list args )
 247 {
 248     int64_t i_tell;
 249     double  f, *pf;
 250     int64_t i64, *pi64;
 251
 252     if( i_end < 0 )    i_end   = stream_Size( s );
 253     if( i_start < 0 )  i_start = 0;
 254     if( i_align <= 0 ) i_align = 1;
 255     i_tell = stream_Tell( s );
 256
 257     switch( i_query )
 258     {
 259         case DEMUX_GET_LENGTH:
 260             pi64 = (int64_t*)va_arg( args, int64_t * );
 261             if( i_bitrate > 0 && i_end > i_start )
 262             {
 263                 *pi64 = INT64_C(8000000) * (i_end - i_start) / i_bitrate;
 264                 return VLC_SUCCESS;
 265             }
 266             return VLC_EGENERIC;
 267
 268         case DEMUX_GET_TIME:
 269             pi64 = (int64_t*)va_arg( args, int64_t * );
 270             if( i_bitrate > 0 && i_tell >= i_start )
 271             {
 272                 *pi64 = INT64_C(8000000) * (i_tell - i_start) / i_bitrate;
 273                 return VLC_SUCCESS;
 274             }
 275             return VLC_EGENERIC;
 276
 277         case DEMUX_GET_POSITION:
 278             pf = (double*)va_arg( args, double * );
 279             if( i_start < i_end )
 280             {
 281                 *pf = (double)( i_tell - i_start ) /
 282                       (double)( i_end  - i_start );
 283                 return VLC_SUCCESS;
 284             }
 285             return VLC_EGENERIC;
 286
 287
 288         case DEMUX_SET_POSITION:
 289             f = (double)va_arg( args, double );
 290             if( i_start < i_end && f >= 0.0 && f <= 1.0 )
 291             {
 292                 int64_t i_block = (f * ( i_end - i_start )) / i_align;
 293
 294                 if( stream_Seek( s, i_start + i_block * i_align ) )
 295                 {
 296                     return VLC_EGENERIC;
 297                 }
 298                 return VLC_SUCCESS;
 299             }
 300             return VLC_EGENERIC;
 301
 302         case DEMUX_SET_TIME:
 303             i64 = (int64_t)va_arg( args, int64_t );
 304             if( i_bitrate > 0 && i64 >= 0 )
 305             {
 306                 int64_t i_block = i64 * i_bitrate / INT64_C(8000000) / i_align;
 307                 if( stream_Seek( s, i_start + i_block * i_align ) )
 308                 {
 309                     return VLC_EGENERIC;
 310                 }
 311                 return VLC_SUCCESS;
 312             }
 313             return VLC_EGENERIC;
 314
 315         case DEMUX_GET_FPS:
 316         case DEMUX_GET_META:
 317         case DEMUX_HAS_UNSUPPORTED_META:
 318         case DEMUX_SET_NEXT_DEMUX_TIME:
 319         case DEMUX_GET_TITLE_INFO:
 320         case DEMUX_SET_GROUP:
 321         case DEMUX_GET_ATTACHMENTS:
 322         case DEMUX_CAN_RECORD:
 323         case DEMUX_SET_RECORD_STATE:
 324             return VLC_EGENERIC;
 325
 326         default:
 327             msg_Err( s, "unknown query in demux_vaControlDefault" );
 328             return VLC_EGENERIC;
 329     }
 330 }
 331
 332 /****************************************************************************
 333  * Utility functions
 334  ****************************************************************************/
 335 decoder_t *demux_PacketizerNew( demux_t *p_demux, es_format_t *p_fmt, const char *psz_msg )
 336 {
 337     decoder_t *p_packetizer;
 338     p_packetizer = vlc_custom_create( p_demux, sizeof( *p_packetizer ),
 339                                       VLC_OBJECT_GENERIC, "demux packetizer" );
 340     if( !p_packetizer )
 341     {
 342         es_format_Clean( p_fmt );
 343         return NULL;
 344     }
 345     p_fmt->b_packetized = false;
 346
 347     p_packetizer->pf_decode_audio = NULL;
 348     p_packetizer->pf_decode_video = NULL;
 349     p_packetizer->pf_decode_sub = NULL;
 350     p_packetizer->pf_packetize = NULL;
 351
 352     p_packetizer->fmt_in = *p_fmt;
 353     es_format_Init( &p_packetizer->fmt_out, UNKNOWN_ES, 0 );
 354
 355     vlc_object_attach( p_packetizer, p_demux );
 356     p_packetizer->p_module = module_need( p_packetizer, "packetizer", NULL, false );
 357     if( !p_packetizer->p_module )
 358     {
 359         es_format_Clean( p_fmt );
 360         vlc_object_release( p_packetizer );
 361         msg_Err( p_demux, "cannot find packetizer for %s", psz_msg );
 362         return NULL;
 363     }
 364
 365     return p_packetizer;
 366 }
 367
 368 void demux_PacketizerDestroy( decoder_t *p_packetizer )
 369 {
 370     if( p_packetizer->p_module )
 371         module_unneed( p_packetizer, p_packetizer->p_module );
 372     es_format_Clean( &p_packetizer->fmt_in );
 373     if( p_packetizer->p_description )
 374         vlc_meta_Delete( p_packetizer->p_description );
 375     vlc_object_release( p_packetizer );
 376 }
 377
 378 static bool SkipID3Tag( demux_t *p_demux )
 379 {
 380     const uint8_t *p_peek;
 381     uint8_t version, revision;
 382     int i_size;
 383     int b_footer;
 384
 385     if( !p_demux->s )
 386         return false;
 387
 388     /* Get 10 byte id3 header */
 389     if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
 390         return false;
 391
 392     if( memcmp( p_peek, "ID3", 3 ) )
 393         return false;
 394
 395     version = p_peek[3];
 396     revision = p_peek[4];
 397     b_footer = p_peek[5] & 0x10;
 398     i_size = (p_peek[6]<<21) + (p_peek[7]<<14) + (p_peek[8]<<7) + p_peek[9];
 399
 400     if( b_footer ) i_size += 10;
 401     i_size += 10;
 402
 403     /* Skip the entire tag */
 404     stream_Read( p_demux->s, NULL, i_size );
 405
 406     msg_Dbg( p_demux, "ID3v2.%d revision %d tag found, skipping %d bytes",
 407              version, revision, i_size );
 408     return true;
 409 }
 410 static bool SkipAPETag( demux_t *p_demux )
 411 {
 412     const uint8_t *p_peek;
 413     int i_version;
 414     int i_size;
 415     uint32_t flags;
 416
 417     if( !p_demux->s )
 418         return false;
 419
 420     /* Get 32 byte ape header */
 421     if( stream_Peek( p_demux->s, &p_peek, 32 ) < 32 )
 422         return false;
 423
 424     if( memcmp( p_peek, "APETAGEX", 8 ) )
 425         return false;
 426
 427     i_version = GetDWLE( &p_peek[8] );
 428     flags = GetDWLE( &p_peek[8+4+4] );
 429     if( ( i_version != 1000 && i_version != 2000 ) || !( flags & (1<<29) ) )
 430         return false;
 431
 432     i_size = GetDWLE( &p_peek[8+4] ) + ( (flags&(1<<30)) ? 32 : 0 );
 433
 434     /* Skip the entire tag */
 435     stream_Read( p_demux->s, NULL, i_size );
 436
 437     msg_Dbg( p_demux, "AP2 v%d tag found, skipping %d bytes",
 438              i_version/1000, i_size );
 439     return true;
 440 }
 441