git.sesse.net Git - vlc/blob - 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 <vlc_common.h>
  29
  30 #include "input_internal.h"
  31
  32 static bool SkipID3Tag( demux_t * );
  33 static bool SkipAPETag( demux_t *p_demux );
  34
  35 /*****************************************************************************
  36  * demux_New:
  37  *  if s is NULL then load a access_demux
  38  *****************************************************************************/
  39 demux_t *__demux_New( vlc_object_t *p_obj,
  40                        const char *psz_access, const char *psz_demux,
  41                        const char *psz_path,
  42                        stream_t *s, es_out_t *out, bool b_quick )
  43 {
  44     static const char typename[] = "demux";
  45     demux_t *p_demux = vlc_custom_create( p_obj, sizeof( *p_demux ),
  46                                           VLC_OBJECT_GENERIC, typename );
  47     const char *psz_module;
  48
  49     if( p_demux == NULL ) return NULL;
  50
  51     /* Parse URL */
  52     p_demux->psz_access = strdup( psz_access );
  53     p_demux->psz_demux  = strdup( psz_demux );
  54     p_demux->psz_path   = strdup( psz_path );
  55
  56     /* Take into account "demux" to be able to do :demux=dump */
  57     if( *p_demux->psz_demux == '\0' )
  58     {
  59         free( p_demux->psz_demux );
  60         p_demux->psz_demux = var_GetNonEmptyString( p_obj, "demux" );
  61         if( p_demux->psz_demux == NULL )
  62             p_demux->psz_demux = strdup( "" );
  63     }
  64
  65     if( !b_quick )
  66     {
  67         msg_Dbg( p_obj, "creating demux: access='%s' demux='%s' path='%s'",
  68                  p_demux->psz_access, p_demux->psz_demux, p_demux->psz_path );
  69     }
  70
  71     p_demux->s          = s;
  72     p_demux->out        = out;
  73
  74     p_demux->pf_demux   = NULL;
  75     p_demux->pf_control = NULL;
  76     p_demux->p_sys      = NULL;
  77     p_demux->info.i_update = 0;
  78     p_demux->info.i_title  = 0;
  79     p_demux->info.i_seekpoint = 0;
  80
  81     if( s ) psz_module = p_demux->psz_demux;
  82     else psz_module = p_demux->psz_access;
  83
  84     if( s && *psz_module == '\0' && strrchr( p_demux->psz_path, '.' ) )
  85     {
  86        /* XXX: add only file without any problem here and with strong detection.
  87         *  - no .mp3, .a52, ... (aac is added as it works only by file ext
  88         *     anyway
  89         *  - wav can't be added 'cause of a52 and dts in them as raw audio
  90          */
  91          static const struct { char ext[5]; char demux[9]; } exttodemux[] =
  92          {
  93             { "aac",  "aac" },
  94             { "aiff", "aiff" },
  95             { "asf",  "asf" }, { "wmv",  "asf" }, { "wma",  "asf" },
  96             { "avi",  "avi" },
  97             { "au",   "au" },
  98             { "flac", "flac" },
  99             { "dv",   "dv" },
 100             { "m3u",  "playlist" },
 101             { "mkv",  "mkv" }, { "mka",  "mkv" }, { "mks",  "mkv" },
 102             { "mp4",  "mp4" }, { "m4a",  "mp4" }, { "mov",  "mp4" }, { "moov", "mp4" },
 103             { "mod",  "mod" }, { "xm",   "mod" },
 104             { "nsv",  "nsv" },
 105             { "ogg",  "ogg" }, { "ogm",  "ogg" },
 106             { "pva",  "pva" },
 107             { "rm",   "rm" },
 108             { "m4v",  "m4v" },
 109             { "h264",  "h264" },
 110             { "",  "" },
 111         };
 112         /* Here, we don't mind if it does not work, it must be quick */
 113         static const struct { char ext[4]; char demux[5]; } exttodemux_quick[] =
 114         {
 115             { "mp3", "mpga" },
 116             { "ogg", "ogg" },
 117             { "wma", "asf" },
 118             { "", "" }
 119         };
 120
 121         const char *psz_ext = strrchr( p_demux->psz_path, '.' ) + 1;
 122         int  i;
 123
 124         if( !b_quick )
 125         {
 126             for( i = 0; exttodemux[i].ext[0]; i++ )
 127             {
 128                 if( !strcasecmp( psz_ext, exttodemux[i].ext ) )
 129                 {
 130                     psz_module = exttodemux[i].demux;
 131                     break;
 132                 }
 133             }
 134         }
 135         else
 136         {
 137             for( i = 0; exttodemux_quick[i].ext[0]; i++ )
 138             {
 139                 if( !strcasecmp( psz_ext, exttodemux_quick[i].ext ) )
 140                 {
 141                     psz_module = exttodemux_quick[i].demux;
 142                     break;
 143                 }
 144             }
 145
 146         }
 147     }
 148
 149     /* Before module_Need (for var_Create...) */
 150     vlc_object_attach( p_demux, p_obj );
 151
 152     if( s )
 153     {
 154         /* ID3/APE tags will mess-up demuxer probing so we skip it here.
 155          * ID3/APE parsers will called later on in the demuxer to access the
 156          * skipped info. */
 157         if( !SkipID3Tag( p_demux ) )
 158             SkipAPETag( p_demux );
 159
 160         p_demux->p_module =
 161             module_Need( p_demux, "demux", psz_module,
 162                          !strcmp( psz_module, p_demux->psz_demux ) ?
 163                          true : false );
 164     }
 165     else
 166     {
 167         p_demux->p_module =
 168             module_Need( p_demux, "access_demux", psz_module,
 169                          !strcmp( psz_module, p_demux->psz_access ) ?
 170                          true : false );
 171     }
 172
 173     if( p_demux->p_module == NULL )
 174     {
 175         vlc_object_detach( p_demux );
 176         free( p_demux->psz_path );
 177         free( p_demux->psz_demux );
 178         free( p_demux->psz_access );
 179         vlc_object_release( p_demux );
 180         return NULL;
 181     }
 182
 183     return p_demux;
 184 }
 185
 186 /*****************************************************************************
 187  * demux_Delete:
 188  *****************************************************************************/
 189 void demux_Delete( demux_t *p_demux )
 190 {
 191     module_Unneed( p_demux, p_demux->p_module );
 192     vlc_object_detach( p_demux );
 193
 194     free( p_demux->psz_path );
 195     free( p_demux->psz_demux );
 196     free( p_demux->psz_access );
 197
 198     vlc_object_release( p_demux );
 199 }
 200
 201 /*****************************************************************************
 202  * demux_vaControlHelper:
 203  *****************************************************************************/
 204 int demux_vaControlHelper( stream_t *s,
 205                             int64_t i_start, int64_t i_end,
 206                             int i_bitrate, int i_align,
 207                             int i_query, va_list args )
 208 {
 209     int64_t i_tell;
 210     double  f, *pf;
 211     int64_t i64, *pi64;
 212
 213     if( i_end < 0 )    i_end   = stream_Size( s );
 214     if( i_start < 0 )  i_start = 0;
 215     if( i_align <= 0 ) i_align = 1;
 216     i_tell = stream_Tell( s );
 217
 218     switch( i_query )
 219     {
 220         case DEMUX_GET_LENGTH:
 221             pi64 = (int64_t*)va_arg( args, int64_t * );
 222             if( i_bitrate > 0 && i_end > i_start )
 223             {
 224                 *pi64 = INT64_C(8000000) * (i_end - i_start) / i_bitrate;
 225                 return VLC_SUCCESS;
 226             }
 227             return VLC_EGENERIC;
 228
 229         case DEMUX_GET_TIME:
 230             pi64 = (int64_t*)va_arg( args, int64_t * );
 231             if( i_bitrate > 0 && i_end > i_start )
 232             {
 233                 *pi64 = INT64_C(8000000) * (i_tell - i_start) / i_bitrate;
 234                 return VLC_SUCCESS;
 235             }
 236             return VLC_EGENERIC;
 237
 238         case DEMUX_GET_POSITION:
 239             pf = (double*)va_arg( args, double * );
 240             if( i_start < i_end )
 241             {
 242                 *pf = (double)( i_tell - i_start ) /
 243                       (double)( i_end  - i_start );
 244                 return VLC_SUCCESS;
 245             }
 246             return VLC_EGENERIC;
 247
 248
 249         case DEMUX_SET_POSITION:
 250             f = (double)va_arg( args, double );
 251             if( i_start < i_end && f >= 0.0 && f <= 1.0 )
 252             {
 253                 int64_t i_block = (f * ( i_end - i_start )) / i_align;
 254
 255                 if( stream_Seek( s, i_start + i_block * i_align ) )
 256                 {
 257                     return VLC_EGENERIC;
 258                 }
 259                 return VLC_SUCCESS;
 260             }
 261             return VLC_EGENERIC;
 262
 263         case DEMUX_SET_TIME:
 264             i64 = (int64_t)va_arg( args, int64_t );
 265             if( i_bitrate > 0 && i64 >= 0 )
 266             {
 267                 int64_t i_block = i64 * i_bitrate / INT64_C(8000000) / i_align;
 268                 if( stream_Seek( s, i_start + i_block * i_align ) )
 269                 {
 270                     return VLC_EGENERIC;
 271                 }
 272                 return VLC_SUCCESS;
 273             }
 274             return VLC_EGENERIC;
 275
 276         case DEMUX_GET_FPS:
 277         case DEMUX_GET_META:
 278         case DEMUX_HAS_UNSUPPORTED_META:
 279         case DEMUX_SET_NEXT_DEMUX_TIME:
 280         case DEMUX_GET_TITLE_INFO:
 281         case DEMUX_SET_GROUP:
 282         case DEMUX_GET_ATTACHMENTS:
 283             return VLC_EGENERIC;
 284
 285         default:
 286             msg_Err( s, "unknown query in demux_vaControlDefault" );
 287             return VLC_EGENERIC;
 288     }
 289 }
 290
 291 /****************************************************************************
 292  * stream_Demux*: create a demuxer for an outpout stream (allow demuxer chain)
 293  ****************************************************************************/
 294 typedef struct
 295 {
 296     /* Data buffer */
 297     block_fifo_t *p_fifo;
 298     block_t      *p_block;
 299
 300     int64_t     i_pos;
 301
 302     /* Demuxer */
 303     char        *psz_name;
 304     es_out_t    *out;
 305     demux_t     *p_demux;
 306
 307 } d_stream_sys_t;
 308
 309 static int DStreamRead   ( stream_t *, void *p_read, int i_read );
 310 static int DStreamPeek   ( stream_t *, const uint8_t **pp_peek, int i_peek );
 311 static int DStreamControl( stream_t *, int i_query, va_list );
 312 static int DStreamThread ( stream_t * );
 313
 314
 315 stream_t *__stream_DemuxNew( vlc_object_t *p_obj, const char *psz_demux,
 316                              es_out_t *out )
 317 {
 318     /* We create a stream reader, and launch a thread */
 319     stream_t       *s;
 320     d_stream_sys_t *p_sys;
 321
 322     if( psz_demux == NULL || *psz_demux == '\0' ) return NULL;
 323
 324     s = vlc_stream_create( p_obj );
 325     if( s == NULL )
 326         return NULL;
 327     s->pf_read   = DStreamRead;
 328     s->pf_peek   = DStreamPeek;
 329     s->pf_control= DStreamControl;
 330
 331     s->i_char_width = 1;
 332     s->b_little_endian = false;
 333
 334     s->p_sys = malloc( sizeof( d_stream_sys_t) );
 335     if( s->p_sys == NULL )
 336     {
 337         vlc_object_release( s );
 338         return NULL;
 339     }
 340     p_sys = (d_stream_sys_t*)s->p_sys;
 341
 342     p_sys->i_pos = 0;
 343     p_sys->out = out;
 344     p_sys->p_demux = NULL;
 345     p_sys->p_block = NULL;
 346     p_sys->psz_name = strdup( psz_demux );
 347
 348     /* decoder fifo */
 349     if( ( p_sys->p_fifo = block_FifoNew() ) == NULL )
 350     {
 351         vlc_object_release( s );
 352         free( p_sys->psz_name );
 353         free( p_sys );
 354         return NULL;
 355     }
 356
 357     if( vlc_thread_create( s, "stream out", DStreamThread,
 358                            VLC_THREAD_PRIORITY_INPUT, false ) )
 359     {
 360         vlc_object_release( s );
 361         free( p_sys );
 362         return NULL;
 363     }
 364
 365     return s;
 366 }
 367
 368 void stream_DemuxSend( stream_t *s, block_t *p_block )
 369 {
 370     d_stream_sys_t *p_sys = (d_stream_sys_t*)s->p_sys;
 371     if( p_block ) block_FifoPut( p_sys->p_fifo, p_block );
 372 }
 373
 374 void stream_DemuxDelete( stream_t *s )
 375 {
 376     d_stream_sys_t *p_sys = (d_stream_sys_t*)s->p_sys;
 377     block_t *p_empty;
 378
 379     vlc_object_kill( s );
 380     if( p_sys->p_demux )
 381         vlc_object_kill( p_sys->p_demux );
 382     p_empty = block_New( s, 1 ); p_empty->i_buffer = 0;
 383     block_FifoPut( p_sys->p_fifo, p_empty );
 384     vlc_thread_join( s );
 385
 386     if( p_sys->p_demux ) demux_Delete( p_sys->p_demux );
 387     if( p_sys->p_block ) block_Release( p_sys->p_block );
 388
 389     block_FifoRelease( p_sys->p_fifo );
 390     free( p_sys->psz_name );
 391     free( p_sys );
 392
 393     vlc_object_release( s );
 394 }
 395
 396
 397 static int DStreamRead( stream_t *s, void *p_read, int i_read )
 398 {
 399     d_stream_sys_t *p_sys = (d_stream_sys_t*)s->p_sys;
 400     uint8_t *p_out = p_read;
 401     int i_out = 0;
 402
 403     //msg_Dbg( s, "DStreamRead: wanted %d bytes", i_read );
 404
 405     while( !s->b_die && !s->b_error && i_read )
 406     {
 407         block_t *p_block = p_sys->p_block;
 408         int i_copy;
 409
 410         if( !p_block )
 411         {
 412             p_block = block_FifoGet( p_sys->p_fifo );
 413             if( !p_block ) s->b_error = 1;
 414             p_sys->p_block = p_block;
 415         }
 416
 417         if( p_block && i_read )
 418         {
 419             i_copy = __MIN( i_read, p_block->i_buffer );
 420             if( p_out && i_copy ) memcpy( p_out, p_block->p_buffer, i_copy );
 421             i_read -= i_copy;
 422             i_out += i_copy;
 423             p_block->i_buffer -= i_copy;
 424             p_block->p_buffer += i_copy;
 425
 426             if( !p_block->i_buffer )
 427             {
 428                 block_Release( p_block );
 429                 p_sys->p_block = NULL;
 430             }
 431         }
 432     }
 433
 434     p_sys->i_pos += i_out;
 435     return i_out;
 436 }
 437
 438 static int DStreamPeek( stream_t *s, const uint8_t **pp_peek, int i_peek )
 439 {
 440     d_stream_sys_t *p_sys = (d_stream_sys_t*)s->p_sys;
 441     block_t **pp_block = &p_sys->p_block;
 442     int i_out = 0;
 443     *pp_peek = 0;
 444
 445     //msg_Dbg( s, "DStreamPeek: wanted %d bytes", i_peek );
 446
 447     while( !s->b_die && !s->b_error && i_peek )
 448     {
 449         int i_copy;
 450
 451         if( !*pp_block )
 452         {
 453             *pp_block = block_FifoGet( p_sys->p_fifo );
 454             if( !*pp_block ) s->b_error = 1;
 455         }
 456
 457         if( *pp_block && i_peek )
 458         {
 459             i_copy = __MIN( i_peek, (*pp_block)->i_buffer );
 460             i_peek -= i_copy;
 461             i_out += i_copy;
 462
 463             if( i_peek ) pp_block = &(*pp_block)->p_next;
 464         }
 465     }
 466
 467     if( p_sys->p_block )
 468     {
 469         p_sys->p_block = block_ChainGather( p_sys->p_block );
 470         *pp_peek = p_sys->p_block->p_buffer;
 471     }
 472
 473     return i_out;
 474 }
 475
 476 static int DStreamControl( stream_t *s, int i_query, va_list args )
 477 {
 478     d_stream_sys_t *p_sys = (d_stream_sys_t*)s->p_sys;
 479     int64_t    *p_i64;
 480     bool *p_b;
 481     int        *p_int;
 482
 483     switch( i_query )
 484     {
 485         case STREAM_GET_SIZE:
 486             p_i64 = (int64_t*) va_arg( args, int64_t * );
 487             *p_i64 = 0;
 488             return VLC_SUCCESS;
 489
 490         case STREAM_CAN_SEEK:
 491             p_b = (bool*) va_arg( args, bool * );
 492             *p_b = false;
 493             return VLC_SUCCESS;
 494
 495         case STREAM_CAN_FASTSEEK:
 496             p_b = (bool*) va_arg( args, bool * );
 497             *p_b = false;
 498             return VLC_SUCCESS;
 499
 500         case STREAM_GET_POSITION:
 501             p_i64 = (int64_t*) va_arg( args, int64_t * );
 502             *p_i64 = p_sys->i_pos;
 503             return VLC_SUCCESS;
 504
 505         case STREAM_SET_POSITION:
 506         {
 507             int64_t i64 = (int64_t)va_arg( args, int64_t );
 508             int i_skip;
 509             if( i64 < p_sys->i_pos ) return VLC_EGENERIC;
 510             i_skip = i64 - p_sys->i_pos;
 511
 512             while( i_skip > 0 )
 513             {
 514                 int i_read = DStreamRead( s, NULL, i_skip );
 515                 if( i_read <= 0 ) return VLC_EGENERIC;
 516                 i_skip -= i_read;
 517             }
 518             return VLC_SUCCESS;
 519         }
 520
 521         case STREAM_GET_MTU:
 522             p_int = (int*) va_arg( args, int * );
 523             *p_int = 0;
 524             return VLC_SUCCESS;
 525
 526         case STREAM_CONTROL_ACCESS:
 527         case STREAM_GET_CONTENT_TYPE:
 528             return VLC_EGENERIC;
 529
 530         default:
 531             msg_Err( s, "invalid DStreamControl query=0x%x", i_query );
 532             return VLC_EGENERIC;
 533     }
 534 }
 535
 536 static int DStreamThread( stream_t *s )
 537 {
 538     d_stream_sys_t *p_sys = (d_stream_sys_t*)s->p_sys;
 539     demux_t *p_demux;
 540
 541     /* Create the demuxer */
 542     if( !(p_demux = demux_New( s, "", p_sys->psz_name, "", s, p_sys->out,
 543                                false )) )
 544     {
 545         return VLC_EGENERIC;
 546     }
 547
 548     p_sys->p_demux = p_demux;
 549
 550     /* Main loop */
 551     while( !s->b_die && !p_demux->b_die )
 552     {
 553         if( p_demux->pf_demux( p_demux ) <= 0 ) break;
 554     }
 555
 556     vlc_object_kill( p_demux );
 557     return VLC_SUCCESS;
 558 }
 559
 560 /****************************************************************************
 561  * Utility functions
 562  ****************************************************************************/
 563 static bool SkipID3Tag( demux_t *p_demux )
 564 {
 565     const uint8_t *p_peek;
 566     uint8_t version, revision;
 567     int i_size;
 568     int b_footer;
 569
 570     if( !p_demux->s )
 571         return false;
 572
 573     /* Get 10 byte id3 header */
 574     if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 )
 575         return false;
 576
 577     if( memcmp( p_peek, "ID3", 3 ) )
 578         return false;
 579
 580     version = p_peek[3];
 581     revision = p_peek[4];
 582     b_footer = p_peek[5] & 0x10;
 583     i_size = (p_peek[6]<<21) + (p_peek[7]<<14) + (p_peek[8]<<7) + p_peek[9];
 584
 585     if( b_footer ) i_size += 10;
 586     i_size += 10;
 587
 588     /* Skip the entire tag */
 589     stream_Read( p_demux->s, NULL, i_size );
 590
 591     msg_Dbg( p_demux, "ID3v2.%d revision %d tag found, skipping %d bytes",
 592              version, revision, i_size );
 593     return true;
 594 }
 595 static bool SkipAPETag( demux_t *p_demux )
 596 {
 597     const uint8_t *p_peek;
 598     int i_version;
 599     int i_size;
 600     uint32_t flags;
 601
 602     if( !p_demux->s )
 603         return false;
 604
 605     /* Get 32 byte ape header */
 606     if( stream_Peek( p_demux->s, &p_peek, 32 ) < 32 )
 607         return false;
 608
 609     if( memcmp( p_peek, "APETAGEX", 8 ) )
 610         return false;
 611
 612     i_version = GetDWLE( &p_peek[8] );
 613     flags = GetDWLE( &p_peek[8+4+4] );
 614     if( ( i_version != 1000 && i_version != 2000 ) || !( flags & (1<<29) ) )
 615         return false;
 616
 617     i_size = GetDWLE( &p_peek[8+4] ) + ( (flags&(1<<30)) ? 32 : 0 );
 618
 619     /* Skip the entire tag */
 620     stream_Read( p_demux->s, NULL, i_size );
 621
 622     msg_Dbg( p_demux, "AP2 v%d tag found, skipping %d bytes",
 623              i_version/1000, i_size );
 624     return true;
 625 }
 626