modules/demux/wav.c

   1 /*****************************************************************************
   2  * wav.c : wav file input module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2001-2008 VLC authors and VideoLAN
   5  * $Id$
   6  *
   7  * Authors: 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 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <assert.h>
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_demux.h>
  37 #include <vlc_aout.h>
  38 #include <vlc_codecs.h>
  39
  40 #include "windows_audio_commons.h"
  41
  42 #define WAV_CHAN_MAX 32
  43 static_assert( INPUT_CHAN_MAX >= WAV_CHAN_MAX, "channel count mismatch" );
  44
  45 /*****************************************************************************
  46  * Module descriptor
  47  *****************************************************************************/
  48 static int  Open ( vlc_object_t * );
  49 static void Close( vlc_object_t * );
  50
  51 vlc_module_begin ()
  52     set_description( N_("WAV demuxer") )
  53     set_category( CAT_INPUT )
  54     set_subcategory( SUBCAT_INPUT_DEMUX )
  55     set_capability( "demux", 142 )
  56     set_callbacks( Open, Close )
  57 vlc_module_end ()
  58
  59 /*****************************************************************************
  60  * Local prototypes
  61  *****************************************************************************/
  62 static int Demux  ( demux_t * );
  63 static int Control( demux_t *, int i_query, va_list args );
  64
  65 typedef struct
  66 {
  67     es_format_t     fmt;
  68     es_out_id_t     *p_es;
  69
  70     int64_t         i_data_pos;
  71     int64_t         i_data_size;
  72
  73     unsigned int    i_frame_size;
  74     int             i_frame_samples;
  75
  76     date_t          pts;
  77
  78     uint32_t i_channel_mask;
  79     uint8_t i_chans_to_reorder;            /* do we need channel reordering */
  80     uint8_t pi_chan_table[AOUT_CHAN_MAX];
  81 } demux_sys_t;
  82
  83 static int ChunkFind( demux_t *, const char *, unsigned int * );
  84
  85 static int FrameInfo_IMA_ADPCM( unsigned int *, int *, const es_format_t * );
  86 static int FrameInfo_MS_ADPCM ( unsigned int *, int *, const es_format_t * );
  87 static int FrameInfo_Creative_ADPCM( unsigned int *, int *, const es_format_t * );
  88 static int FrameInfo_PCM      ( unsigned int *, int *, const es_format_t * );
  89 static int FrameInfo_MSGSM    ( unsigned int *, int *, const es_format_t * );
  90
  91 /*****************************************************************************
  92  * Open: check file and initializes structures
  93  *****************************************************************************/
  94 static int Open( vlc_object_t * p_this )
  95 {
  96     demux_t     *p_demux = (demux_t*)p_this;
  97     demux_sys_t *p_sys;
  98
  99     const uint8_t *p_peek;
 100     bool           b_is_rf64;
 101     unsigned int   i_size;
 102     uint64_t       i_data_size;
 103     unsigned int   i_extended;
 104     const char    *psz_name;
 105
 106     WAVEFORMATEXTENSIBLE *p_wf_ext = NULL;
 107     WAVEFORMATEX         *p_wf = NULL;
 108
 109     /* Is it a wav file ? */
 110     if( vlc_stream_Peek( p_demux->s, &p_peek, 12 ) < 12 )
 111         return VLC_EGENERIC;
 112
 113     b_is_rf64 = ( memcmp( p_peek, "RF64", 4 ) == 0 );
 114     if( ( !b_is_rf64 && memcmp( p_peek, "RIFF", 4 ) ) ||
 115           memcmp( &p_peek[8], "WAVE", 4 ) )
 116     {
 117         return VLC_EGENERIC;
 118     }
 119
 120     p_demux->pf_demux     = Demux;
 121     p_demux->pf_control   = Control;
 122     p_demux->p_sys        = p_sys = malloc( sizeof( *p_sys ) );
 123     if( unlikely(!p_sys) )
 124         return VLC_ENOMEM;
 125
 126     es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
 127     p_sys->p_es           = NULL;
 128     p_sys->i_data_size    = 0;
 129     p_sys->i_chans_to_reorder = 0;
 130     p_sys->i_channel_mask = 0;
 131
 132     /* skip riff header */
 133     if( vlc_stream_Read( p_demux->s, NULL, 12 ) != 12 )
 134         goto error;
 135
 136     if( b_is_rf64 )
 137     {
 138         /* search datasize64 chunk */
 139         if( ChunkFind( p_demux, "ds64", &i_size ) )
 140         {
 141             msg_Err( p_demux, "cannot find 'ds64' chunk" );
 142             goto error;
 143         }
 144         if( i_size < 24 )
 145         {
 146             msg_Err( p_demux, "invalid 'ds64' chunk" );
 147             goto error;
 148         }
 149         if( vlc_stream_Read( p_demux->s, NULL, 8 ) != 8 )
 150             goto error;
 151         if( vlc_stream_Peek( p_demux->s, &p_peek, 24 ) < 24 )
 152             goto error;
 153         i_data_size = GetQWLE( &p_peek[8] );
 154         if( i_data_size >> 62 )
 155             p_sys->i_data_size = (int64_t)1 << 62;
 156         else
 157             p_sys->i_data_size = i_data_size;
 158         if( vlc_stream_Read( p_demux->s, NULL, i_size ) != (int)i_size ||
 159             ( (i_size & 1) && vlc_stream_Read( p_demux->s, NULL, 1 ) != 1 ) )
 160             goto error;
 161     }
 162
 163     /* search fmt chunk */
 164     if( ChunkFind( p_demux, "fmt ", &i_size ) )
 165     {
 166         msg_Err( p_demux, "cannot find 'fmt ' chunk" );
 167         goto error;
 168     }
 169     i_size += 2;
 170     if( i_size < sizeof( WAVEFORMATEX ) )
 171     {
 172         msg_Err( p_demux, "invalid 'fmt ' chunk" );
 173         goto error;
 174     }
 175     if( vlc_stream_Read( p_demux->s, NULL, 8 ) != 8 )
 176         goto error;
 177
 178
 179     /* load waveformatex */
 180     p_wf_ext = malloc( i_size );
 181     if( unlikely( !p_wf_ext ) )
 182          goto error;
 183
 184     p_wf         = &p_wf_ext->Format;
 185     p_wf->cbSize = 0;
 186     i_size      -= 2;
 187     if( vlc_stream_Read( p_demux->s, p_wf, i_size ) != (int)i_size ||
 188         ( ( i_size & 1 ) && vlc_stream_Read( p_demux->s, NULL, 1 ) != 1 ) )
 189     {
 190         msg_Err( p_demux, "cannot load 'fmt ' chunk" );
 191         goto error;
 192     }
 193
 194     wf_tag_to_fourcc( GetWLE( &p_wf->wFormatTag ), &p_sys->fmt.i_codec,
 195                       &psz_name );
 196     p_sys->fmt.audio.i_channels      = GetWLE ( &p_wf->nChannels );
 197     p_sys->fmt.audio.i_rate          = GetDWLE( &p_wf->nSamplesPerSec );
 198     p_sys->fmt.audio.i_blockalign    = GetWLE( &p_wf->nBlockAlign );
 199     p_sys->fmt.i_bitrate             = GetDWLE( &p_wf->nAvgBytesPerSec ) * 8;
 200     p_sys->fmt.audio.i_bitspersample = GetWLE( &p_wf->wBitsPerSample );
 201     if( i_size >= sizeof(WAVEFORMATEX) )
 202         p_sys->fmt.i_extra = __MIN( GetWLE( &p_wf->cbSize ), i_size - sizeof(WAVEFORMATEX) );
 203     i_extended = 0;
 204
 205     /* Handle new WAVE_FORMAT_EXTENSIBLE wav files */
 206     /* see the following link for more information:
 207      * http://www.microsoft.com/whdc/device/audio/multichaud.mspx#EFAA */
 208     if( GetWLE( &p_wf->wFormatTag ) == WAVE_FORMAT_EXTENSIBLE &&
 209         i_size >= sizeof( WAVEFORMATEXTENSIBLE ) &&
 210         ( p_sys->fmt.i_extra + sizeof( WAVEFORMATEX )
 211             >= sizeof( WAVEFORMATEXTENSIBLE ) ) )
 212     {
 213         unsigned i_channel_mask;
 214         GUID guid_subformat;
 215
 216         guid_subformat = p_wf_ext->SubFormat;
 217         guid_subformat.Data1 = GetDWLE( &p_wf_ext->SubFormat.Data1 );
 218         guid_subformat.Data2 = GetWLE( &p_wf_ext->SubFormat.Data2 );
 219         guid_subformat.Data3 = GetWLE( &p_wf_ext->SubFormat.Data3 );
 220
 221         sf_tag_to_fourcc( &guid_subformat, &p_sys->fmt.i_codec, &psz_name );
 222
 223         msg_Dbg( p_demux, "extensible format guid " GUID_FMT, GUID_PRINT(guid_subformat) );
 224
 225         i_extended = sizeof( WAVEFORMATEXTENSIBLE ) - sizeof( WAVEFORMATEX );
 226         p_sys->fmt.i_extra -= i_extended;
 227
 228         i_channel_mask = GetDWLE( &p_wf_ext->dwChannelMask );
 229         if( i_channel_mask )
 230         {
 231             int i_match = 0;
 232             p_sys->i_channel_mask = getChannelMask( &i_channel_mask, p_sys->fmt.audio.i_channels, &i_match );
 233             if( i_channel_mask )
 234                 msg_Warn( p_demux, "Some channels are unrecognized or uselessly specified (0x%x)", i_channel_mask );
 235             if( i_match < p_sys->fmt.audio.i_channels )
 236             {
 237                 int i_missing = p_sys->fmt.audio.i_channels - i_match;
 238                 msg_Warn( p_demux, "Trying to fill up unspecified position for %d channels", p_sys->fmt.audio.i_channels - i_match );
 239
 240                 static const uint32_t pi_pair[] = { AOUT_CHAN_REARLEFT|AOUT_CHAN_REARRIGHT,
 241                                                     AOUT_CHAN_MIDDLELEFT|AOUT_CHAN_MIDDLERIGHT,
 242                                                     AOUT_CHAN_LEFT|AOUT_CHAN_RIGHT };
 243                 /* FIXME: Unused yet
 244                 static const uint32_t pi_center[] = { AOUT_CHAN_REARCENTER,
 245                                                       0,
 246                                                       AOUT_CHAN_CENTER }; */
 247
 248                 /* Try to complete with pair */
 249                 for( unsigned i = 0; i < sizeof(pi_pair)/sizeof(*pi_pair); i++ )
 250                 {
 251                     if( i_missing >= 2 && !(p_sys->i_channel_mask & pi_pair[i] ) )
 252                     {
 253                         i_missing -= 2;
 254                         p_sys->i_channel_mask |= pi_pair[i];
 255                     }
 256                 }
 257                 /* Well fill up with what we can */
 258                 for( unsigned i = 0; i < sizeof(pi_channels_aout)/sizeof(*pi_channels_aout) && i_missing > 0; i++ )
 259                 {
 260                     if( !( p_sys->i_channel_mask & pi_channels_aout[i] ) )
 261                     {
 262                         p_sys->i_channel_mask |= pi_channels_aout[i];
 263                         i_missing--;
 264
 265                         if( i_missing <= 0 )
 266                             break;
 267                     }
 268                 }
 269
 270                 i_match = p_sys->fmt.audio.i_channels - i_missing;
 271             }
 272             if( i_match < p_sys->fmt.audio.i_channels )
 273             {
 274                 msg_Err( p_demux, "Invalid/unsupported channel mask" );
 275                 p_sys->i_channel_mask = 0;
 276             }
 277         }
 278     }
 279     if( p_sys->i_channel_mask == 0 && p_sys->fmt.audio.i_channels > 2
 280      && p_sys->fmt.audio.i_channels <= AOUT_CHAN_MAX )
 281     {
 282         /* A dwChannelMask of 0 tells the audio device to render the first
 283          * channel to the first port on the device, the second channel to the
 284          * second port on the device, and so on. pi_default_channels is
 285          * different than pi_channels_aout. Indeed FLC/FRC must be treated a
 286          * SL/SR in that case. See "Default Channel Ordering" and "Details
 287          * about dwChannelMask" from msdn */
 288
 289         static const uint32_t pi_default_channels[] = {
 290             AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER,
 291             AOUT_CHAN_LFE, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
 292             AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_REARCENTER };
 293
 294         for( unsigned i = 0; i < p_sys->fmt.audio.i_channels &&
 295              i < (sizeof(pi_default_channels) / sizeof(*pi_default_channels));
 296              i++ )
 297             p_sys->i_channel_mask |= pi_default_channels[i];
 298     }
 299
 300     if( p_sys->i_channel_mask )
 301     {
 302         if( p_sys->fmt.i_codec == VLC_FOURCC('a','r','a','w') ||
 303             p_sys->fmt.i_codec == VLC_FOURCC('a','f','l','t') )
 304             p_sys->i_chans_to_reorder =
 305                 aout_CheckChannelReorder( pi_channels_aout, NULL,
 306                                           p_sys->i_channel_mask,
 307                                           p_sys->pi_chan_table );
 308
 309         msg_Dbg( p_demux, "channel mask: %x, reordering: %u",
 310                  p_sys->i_channel_mask, p_sys->i_chans_to_reorder );
 311     }
 312
 313     p_sys->fmt.audio.i_physical_channels = p_sys->i_channel_mask;
 314
 315     if( p_sys->fmt.i_extra > 0 )
 316     {
 317         p_sys->fmt.p_extra = malloc( p_sys->fmt.i_extra );
 318         if( unlikely(!p_sys->fmt.p_extra) )
 319         {
 320             p_sys->fmt.i_extra = 0;
 321             goto error;
 322         }
 323         memcpy( p_sys->fmt.p_extra, (uint8_t *)p_wf + sizeof( WAVEFORMATEX ) + i_extended,
 324                 p_sys->fmt.i_extra );
 325     }
 326
 327     msg_Dbg( p_demux, "format: 0x%4.4x, fourcc: %4.4s, channels: %d, "
 328              "freq: %u Hz, bitrate: %uKo/s, blockalign: %d, bits/samples: %d, "
 329              "extra size: %d",
 330              GetWLE( &p_wf->wFormatTag ), (char *)&p_sys->fmt.i_codec,
 331              p_sys->fmt.audio.i_channels, p_sys->fmt.audio.i_rate,
 332              p_sys->fmt.i_bitrate / 8 / 1024, p_sys->fmt.audio.i_blockalign,
 333              p_sys->fmt.audio.i_bitspersample, p_sys->fmt.i_extra );
 334
 335     free( p_wf );
 336     p_wf = NULL;
 337
 338     switch( p_sys->fmt.i_codec )
 339     {
 340     case VLC_FOURCC( 'a', 'r', 'a', 'w' ):
 341     case VLC_FOURCC( 'a', 'f', 'l', 't' ):
 342     case VLC_FOURCC( 'u', 'l', 'a', 'w' ):
 343     case VLC_CODEC_ALAW:
 344     case VLC_CODEC_MULAW:
 345         if( FrameInfo_PCM( &p_sys->i_frame_size, &p_sys->i_frame_samples,
 346                            &p_sys->fmt ) )
 347             goto error;
 348         p_sys->fmt.i_codec =
 349             vlc_fourcc_GetCodecAudio( p_sys->fmt.i_codec,
 350                                       p_sys->fmt.audio.i_bitspersample );
 351         if( p_sys->fmt.i_codec == 0 ) {
 352             msg_Err( p_demux, "Unrecognized codec" );
 353             goto error;
 354         }
 355         break;
 356     case VLC_CODEC_ADPCM_MS:
 357     /* FIXME not sure at all FIXME */
 358     case VLC_FOURCC( 'm', 's', 0x00, 0x61 ):
 359     case VLC_FOURCC( 'm', 's', 0x00, 0x62 ):
 360         if( FrameInfo_MS_ADPCM( &p_sys->i_frame_size, &p_sys->i_frame_samples,
 361                                 &p_sys->fmt ) )
 362             goto error;
 363         break;
 364     case VLC_CODEC_ADPCM_IMA_WAV:
 365         if( FrameInfo_IMA_ADPCM( &p_sys->i_frame_size, &p_sys->i_frame_samples,
 366                                  &p_sys->fmt ) )
 367             goto error;
 368         break;
 369     case VLC_CODEC_ADPCM_CREATIVE:
 370         if( FrameInfo_Creative_ADPCM( &p_sys->i_frame_size, &p_sys->i_frame_samples,
 371                                       &p_sys->fmt ) )
 372             goto error;
 373         break;
 374     case VLC_CODEC_MPGA:
 375     case VLC_CODEC_A52:
 376         /* FIXME set end of area FIXME */
 377         goto error;
 378     case VLC_CODEC_GSM_MS:
 379     case VLC_CODEC_ADPCM_G726:
 380     case VLC_CODEC_TRUESPEECH:
 381     case VLC_CODEC_ATRAC3P:
 382     case VLC_CODEC_ATRAC3:
 383     case VLC_CODEC_G723_1:
 384     case VLC_CODEC_WMA2:
 385         if( FrameInfo_MSGSM( &p_sys->i_frame_size, &p_sys->i_frame_samples,
 386                              &p_sys->fmt ) )
 387             goto error;
 388         break;
 389     default:
 390         msg_Err( p_demux, "unsupported codec (%4.4s)",
 391                  (char*)&p_sys->fmt.i_codec );
 392         goto error;
 393     }
 394
 395     if( p_sys->i_frame_size <= 0 || p_sys->i_frame_samples <= 0 )
 396     {
 397         msg_Dbg( p_demux, "invalid frame size: %i %i", p_sys->i_frame_size,
 398                                                        p_sys->i_frame_samples );
 399         goto error;
 400     }
 401     if( p_sys->fmt.audio.i_rate == 0 )
 402     {
 403         msg_Dbg( p_demux, "invalid sample rate: %i", p_sys->fmt.audio.i_rate );
 404         goto error;
 405     }
 406
 407     msg_Dbg( p_demux, "found %s audio format", psz_name );
 408
 409     if( ChunkFind( p_demux, "data", &i_size ) )
 410     {
 411         msg_Err( p_demux, "cannot find 'data' chunk" );
 412         goto error;
 413     }
 414     if( !b_is_rf64 || i_size < UINT32_MAX )
 415     {
 416         int64_t i_stream_size = stream_Size( p_demux->s );
 417         if( i_stream_size > 0 && i_stream_size >= i_size + p_sys->i_data_pos )
 418             p_sys->i_data_size = i_size;
 419     }
 420
 421     if( vlc_stream_Read( p_demux->s, NULL, 8 ) != 8 )
 422         goto error;
 423     p_sys->i_data_pos = vlc_stream_Tell( p_demux->s );
 424
 425     if( p_sys->fmt.i_bitrate <= 0 )
 426     {
 427         p_sys->fmt.i_bitrate = (int64_t)p_sys->i_frame_size *
 428             p_sys->fmt.audio.i_rate * 8 / p_sys->i_frame_samples;
 429     }
 430
 431     p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
 432     if( unlikely(p_sys->p_es == NULL) )
 433         goto error;
 434
 435     date_Init( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
 436     date_Set( &p_sys->pts, VLC_TICK_0 );
 437
 438     return VLC_SUCCESS;
 439
 440 error:
 441     msg_Err( p_demux, "An error occurred during wav demuxing" );
 442     free( p_wf );
 443     es_format_Clean( &p_sys->fmt );
 444     free( p_sys );
 445     return VLC_EGENERIC;
 446 }
 447
 448 /*****************************************************************************
 449  * Demux: read packet and send them to decoders
 450  *****************************************************************************
 451  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 452  *****************************************************************************/
 453 static int Demux( demux_t *p_demux )
 454 {
 455     demux_sys_t *p_sys = p_demux->p_sys;
 456     block_t     *p_block;
 457     const int64_t i_pos = vlc_stream_Tell( p_demux->s );
 458     unsigned int i_read_size = p_sys->i_frame_size;
 459
 460     if( p_sys->i_data_size > 0 )
 461     {
 462         int64_t i_end = p_sys->i_data_pos + p_sys->i_data_size;
 463         if ( i_pos >= i_end )
 464             return VLC_DEMUXER_EOF;  /* EOF */
 465
 466         /* Don't read past data chunk boundary */
 467         if ( i_end < i_pos + i_read_size )
 468             i_read_size = i_end - i_pos;
 469     }
 470
 471     if( ( p_block = vlc_stream_Block( p_demux->s, i_read_size ) ) == NULL )
 472     {
 473         msg_Warn( p_demux, "cannot read data" );
 474         return VLC_DEMUXER_EOF;
 475     }
 476
 477     p_block->i_dts =
 478     p_block->i_pts = date_Get( &p_sys->pts );
 479
 480     /* set PCR */
 481     es_out_SetPCR( p_demux->out, p_block->i_pts );
 482
 483     /* Do the channel reordering */
 484     if( p_sys->i_chans_to_reorder )
 485         aout_ChannelReorder( p_block->p_buffer, p_block->i_buffer,
 486                              p_sys->fmt.audio.i_channels,
 487                              p_sys->pi_chan_table, p_sys->fmt.i_codec );
 488
 489     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 490
 491     date_Increment( &p_sys->pts, p_sys->i_frame_samples );
 492
 493     return VLC_DEMUXER_SUCCESS;
 494 }
 495
 496 /*****************************************************************************
 497  * Close: frees unused data
 498  *****************************************************************************/
 499 static void Close ( vlc_object_t * p_this )
 500 {
 501     demux_t     *p_demux = (demux_t*)p_this;
 502     demux_sys_t *p_sys   = p_demux->p_sys;
 503
 504     es_format_Clean( &p_sys->fmt );
 505     free( p_sys );
 506 }
 507
 508 /*****************************************************************************
 509  * Control:
 510  *****************************************************************************/
 511 static int Control( demux_t *p_demux, int i_query, va_list args )
 512 {
 513     demux_sys_t *p_sys  = p_demux->p_sys;
 514     int64_t i_end = -1;
 515
 516     if( p_sys->i_data_size > 0 )
 517         i_end = p_sys->i_data_pos + p_sys->i_data_size;
 518
 519     return demux_vaControlHelper( p_demux->s, p_sys->i_data_pos, i_end,
 520                                    p_sys->fmt.i_bitrate,
 521                                    p_sys->fmt.audio.i_blockalign,
 522                                    i_query, args );
 523 }
 524
 525 /*****************************************************************************
 526  * Local functions
 527  *****************************************************************************/
 528 static int ChunkFind( demux_t *p_demux, const char *fcc, unsigned int *pi_size )
 529 {
 530     const uint8_t *p_peek;
 531
 532     for( ;; )
 533     {
 534         uint32_t i_size;
 535
 536         if( vlc_stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
 537         {
 538             msg_Err( p_demux, "cannot peek" );
 539             return VLC_EGENERIC;
 540         }
 541
 542         i_size = GetDWLE( p_peek + 4 );
 543
 544         msg_Dbg( p_demux, "chunk: fcc=`%4.4s` size=%"PRIu32, p_peek, i_size );
 545
 546         if( !memcmp( p_peek, fcc, 4 ) )
 547         {
 548             if( pi_size )
 549             {
 550                 *pi_size = i_size;
 551             }
 552             return VLC_SUCCESS;
 553         }
 554
 555         /* Skip chunk */
 556         if( vlc_stream_Read( p_demux->s, NULL, 8 ) != 8 ||
 557             vlc_stream_Read( p_demux->s, NULL, i_size ) != (int)i_size ||
 558             ( (i_size & 1) && vlc_stream_Read( p_demux->s, NULL, 1 ) != 1 ) )
 559             return VLC_EGENERIC;
 560     }
 561 }
 562
 563 static int FrameInfo_PCM( unsigned int *pi_size, int *pi_samples,
 564                           const es_format_t *p_fmt )
 565 {
 566     int i_bytes;
 567
 568     if( p_fmt->audio.i_rate > 352800
 569      || p_fmt->audio.i_bitspersample > 64
 570      || p_fmt->audio.i_channels > WAV_CHAN_MAX )
 571         return VLC_EGENERIC;
 572
 573     /* read samples for 50ms of */
 574     *pi_samples = __MAX( p_fmt->audio.i_rate / 20, 1 );
 575
 576     i_bytes = *pi_samples * p_fmt->audio.i_channels *
 577         ( (p_fmt->audio.i_bitspersample + 7) / 8 );
 578
 579     if( p_fmt->audio.i_blockalign > 0 )
 580     {
 581         const int i_modulo = i_bytes % p_fmt->audio.i_blockalign;
 582         if( i_modulo > 0 )
 583             i_bytes += p_fmt->audio.i_blockalign - i_modulo;
 584     }
 585
 586     *pi_size = i_bytes;
 587     return VLC_SUCCESS;
 588 }
 589
 590 static int FrameInfo_MS_ADPCM( unsigned int *pi_size, int *pi_samples,
 591                                const es_format_t *p_fmt )
 592 {
 593     if( p_fmt->audio.i_channels == 0 )
 594         return VLC_EGENERIC;
 595
 596     *pi_samples = 2 + 2 * ( p_fmt->audio.i_blockalign -
 597         7 * p_fmt->audio.i_channels ) / p_fmt->audio.i_channels;
 598     *pi_size = p_fmt->audio.i_blockalign;
 599
 600     return VLC_SUCCESS;
 601 }
 602
 603 static int FrameInfo_IMA_ADPCM( unsigned int *pi_size, int *pi_samples,
 604                                 const es_format_t *p_fmt )
 605 {
 606     if( p_fmt->audio.i_channels == 0 )
 607         return VLC_EGENERIC;
 608
 609     *pi_samples = 2 * ( p_fmt->audio.i_blockalign -
 610         4 * p_fmt->audio.i_channels ) / p_fmt->audio.i_channels;
 611     *pi_size = p_fmt->audio.i_blockalign;
 612
 613     return VLC_SUCCESS;
 614 }
 615
 616 static int FrameInfo_Creative_ADPCM( unsigned int *pi_size, int *pi_samples,
 617                                      const es_format_t *p_fmt )
 618 {
 619     if( p_fmt->audio.i_channels == 0 )
 620         return VLC_EGENERIC;
 621
 622     /* 4 bits / sample */
 623     *pi_samples = p_fmt->audio.i_blockalign * 2 / p_fmt->audio.i_channels;
 624     *pi_size = p_fmt->audio.i_blockalign;
 625
 626     return VLC_SUCCESS;
 627 }
 628
 629 static int FrameInfo_MSGSM( unsigned int *pi_size, int *pi_samples,
 630                             const es_format_t *p_fmt )
 631 {
 632     if( p_fmt->i_bitrate <= 0 )
 633         return VLC_EGENERIC;
 634
 635     *pi_samples = ( p_fmt->audio.i_blockalign * p_fmt->audio.i_rate * 8)
 636                     / p_fmt->i_bitrate;
 637     *pi_size = p_fmt->audio.i_blockalign;
 638
 639     return VLC_SUCCESS;
 640 }
 641