modules/demux/voc.c

   1 /*****************************************************************************
   2  * voc.c : Creative Voice File (.VOC) demux module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2005 Rémi Denis-Courmont
   5  * $Id$
   6  *
   7  * Authors: Rémi Denis-Courmont <rem # videolan.org>
   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 <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_demux.h>
  35
  36 /*****************************************************************************
  37  * Module descriptor
  38  *****************************************************************************/
  39 static int  Open ( vlc_object_t * );
  40 static void Close( vlc_object_t * );
  41
  42 vlc_module_begin ()
  43     set_description( N_("VOC demuxer") )
  44     set_category( CAT_INPUT )
  45     set_subcategory( SUBCAT_INPUT_DEMUX )
  46     set_capability( "demux", 10 )
  47     set_callbacks( Open, Close )
  48 vlc_module_end ()
  49
  50 /*****************************************************************************
  51  * Local prototypes
  52  *****************************************************************************/
  53 static int Demux  ( demux_t * );
  54 static int Control( demux_t *, int i_query, va_list args );
  55
  56 struct demux_sys_t
  57 {
  58     es_format_t     fmt;
  59     es_out_id_t     *p_es;
  60
  61     int64_t         i_block_start;
  62     int64_t         i_block_end;
  63
  64     int64_t         i_loop_offset;
  65     unsigned        i_loop_count;
  66     unsigned        i_silence_countdown;
  67
  68     date_t          pts;
  69 };
  70
  71 static const char ct_header[] = "Creative Voice File\x1a";
  72
  73 /*****************************************************************************
  74  * Open: check file and initializes structures
  75  *****************************************************************************/
  76 static int Open( vlc_object_t * p_this )
  77 {
  78     demux_t     *p_demux = (demux_t*)p_this;
  79     demux_sys_t *p_sys;
  80     const uint8_t *p_buf;
  81     uint16_t    i_data_offset, i_version;
  82
  83     if( vlc_stream_Peek( p_demux->s, &p_buf, 26 ) < 26 )
  84         return VLC_EGENERIC;
  85
  86     if( memcmp( p_buf, ct_header, 20 ) )
  87         return VLC_EGENERIC;
  88     p_buf += 20;
  89
  90     i_data_offset = GetWLE( p_buf );
  91     if ( i_data_offset < 26 /* not enough room for full VOC header */ )
  92         return VLC_EGENERIC;
  93     p_buf += 2;
  94
  95     i_version = GetWLE( p_buf );
  96     if( ( i_version != 0x10A ) && ( i_version != 0x114 ) )
  97         return VLC_EGENERIC; /* unknown VOC version */
  98     p_buf += 2;
  99
 100     if( GetWLE( p_buf ) != (uint16_t)(0x1234 + ~i_version) )
 101         return VLC_EGENERIC;
 102
 103     /* We have a valid VOC header */
 104     msg_Dbg( p_demux, "CT Voice file v%d.%d", i_version >> 8,
 105              i_version & 0xff );
 106
 107     /* skip VOC header */
 108     if( vlc_stream_Read( p_demux->s, NULL, i_data_offset ) < i_data_offset )
 109         return VLC_EGENERIC;
 110
 111     p_demux->pf_demux   = Demux;
 112     p_demux->pf_control = Control;
 113     p_demux->p_sys      = p_sys = malloc( sizeof( demux_sys_t ) );
 114     if( p_sys == NULL )
 115         return VLC_ENOMEM;
 116
 117     p_sys->i_silence_countdown = p_sys->i_block_start = p_sys->i_block_end =
 118     p_sys->i_loop_count = 0;
 119     p_sys->p_es = NULL;
 120
 121     date_Init( &p_sys->pts, 1, 1 );
 122     date_Set( &p_sys->pts, 1 );
 123
 124     es_format_Init( &p_sys->fmt, AUDIO_ES, 0 );
 125
 126     return VLC_SUCCESS;
 127 }
 128
 129
 130 static int fmtcmp( es_format_t *ofmt, es_format_t *nfmt )
 131 {
 132     return (ofmt->audio.i_bitspersample != nfmt->audio.i_bitspersample)
 133         || (ofmt->audio.i_rate != nfmt->audio.i_rate)
 134         || (ofmt->audio.i_channels != nfmt->audio.i_channels);
 135 }
 136
 137
 138 /*
 139  * Converts old-style VOC sample rates to commonly used ones
 140  * so as not to confuse sound card drivers.
 141  * (I assume 16k, 24k and 32k are never found in .VOC files)
 142  */
 143 static unsigned int fix_voc_sr( unsigned int sr )
 144 {
 145     switch( sr )
 146     {
 147         /*case 8000:
 148             return 8000;*/
 149         case 11111:
 150             return 11025;
 151
 152         case 22222:
 153             return 22050;
 154
 155         case 44444:
 156             return 44100;
 157     }
 158     return sr;
 159 }
 160
 161 static int ReadBlockHeader( demux_t *p_demux )
 162 {
 163     es_format_t     new_fmt;
 164     uint8_t buf[8];
 165     int32_t i_block_size;
 166     demux_sys_t *p_sys = p_demux->p_sys;
 167
 168     if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 )
 169         return VLC_EGENERIC; /* EOF */
 170
 171     i_block_size = GetDWLE( buf ) >> 8;
 172     msg_Dbg( p_demux, "new block: type: %u, size: %u",
 173              (unsigned)*buf, i_block_size );
 174
 175     es_format_Init( &new_fmt, AUDIO_ES, 0 );
 176
 177     switch( *buf )
 178     {
 179         case 0: /* not possible : caught with earlier vlc_stream_Read */
 180             goto corrupt;
 181
 182         case 1:
 183             if( i_block_size < 2 )
 184                 goto corrupt;
 185             i_block_size -= 2;
 186
 187             if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 )
 188                 goto corrupt;
 189
 190             switch( buf[1] ) /* codec id */
 191             {
 192             case 0x0:
 193                 new_fmt.i_codec = VLC_CODEC_U8;
 194                 new_fmt.audio.i_bytes_per_frame = 1;
 195                 new_fmt.audio.i_bitspersample = 8;
 196                 break;
 197             case 0x1:
 198                 new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_4;
 199                 new_fmt.audio.i_bytes_per_frame = 1;
 200                 new_fmt.audio.i_bitspersample = 4;
 201                 break;
 202             case 0x2:
 203                 new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_3;
 204                 new_fmt.audio.i_bytes_per_frame = 3;
 205                 new_fmt.audio.i_bitspersample = 3;
 206                 break;
 207             case 0x3:
 208                 new_fmt.i_codec = VLC_CODEC_ADPCM_SBPRO_2;
 209                 new_fmt.audio.i_bytes_per_frame = 1;
 210                 new_fmt.audio.i_bitspersample = 2;
 211                 break;
 212             case 0x4:
 213                 new_fmt.i_codec = VLC_CODEC_S16L;
 214                 new_fmt.audio.i_bytes_per_frame = 2;
 215                 new_fmt.audio.i_bitspersample = 16;
 216                 break;
 217             case 0x6:
 218                 new_fmt.i_codec = VLC_CODEC_ALAW;
 219                 new_fmt.audio.i_bytes_per_frame = 1;
 220                 new_fmt.audio.i_bitspersample = 8;
 221                 break;
 222             case 0x7:
 223                 new_fmt.i_codec = VLC_CODEC_MULAW;
 224                 new_fmt.audio.i_bytes_per_frame = 1;
 225                 new_fmt.audio.i_bitspersample = 8;
 226                 break;
 227             default:
 228                 msg_Err( p_demux, "unsupported compression 0x%"PRIx8, buf[1] );
 229                 return VLC_EGENERIC;
 230             }
 231
 232             new_fmt.audio.i_channels = 1;
 233             new_fmt.audio.i_bytes_per_frame *= new_fmt.audio.i_channels;
 234             new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
 235
 236             new_fmt.audio.i_frame_length = new_fmt.audio.i_bytes_per_frame * 8
 237                                          / new_fmt.audio.i_bitspersample;
 238
 239             new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
 240             new_fmt.i_bitrate = new_fmt.audio.i_rate * new_fmt.audio.i_bitspersample
 241                               * new_fmt.audio.i_channels;
 242
 243             break;
 244
 245         case 2: /* data block with same format as the previous one */
 246             if( p_sys->p_es == NULL )
 247                 goto corrupt; /* no previous block! */
 248
 249             memcpy( &new_fmt, &p_sys->fmt, sizeof( new_fmt ) );
 250             break;
 251
 252         case 3: /* silence block */
 253             if( ( i_block_size != 3 )
 254              || ( vlc_stream_Read( p_demux->s, buf, 3 ) < 3 ) )
 255                 goto corrupt;
 256
 257             i_block_size = 0;
 258             p_sys->i_silence_countdown = GetWLE( buf );
 259
 260             new_fmt.i_codec = VLC_CODEC_U8;
 261             new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
 262             new_fmt.audio.i_bytes_per_frame = 1;
 263             new_fmt.audio.i_frame_length = 1;
 264             new_fmt.audio.i_channels = 1;
 265             new_fmt.audio.i_blockalign = 1;
 266             new_fmt.audio.i_bitspersample = 8;
 267             new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
 268             break;
 269
 270         case 6: /* repeat block */
 271             if( ( i_block_size != 2 )
 272              || ( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 ) )
 273                 goto corrupt;
 274
 275             i_block_size = 0;
 276             p_sys->i_loop_count = GetWLE( buf );
 277             p_sys->i_loop_offset = vlc_stream_Tell( p_demux->s );
 278             break;
 279
 280         case 7: /* repeat end block */
 281             if( i_block_size != 0 )
 282                 goto corrupt;
 283
 284             if( p_sys->i_loop_count > 0 )
 285             {
 286                 if( vlc_stream_Seek( p_demux->s, p_sys->i_loop_offset ) )
 287                     msg_Warn( p_demux, "cannot loop: seek failed" );
 288                 else
 289                     p_sys->i_loop_count--;
 290             }
 291             break;
 292
 293         case 8:
 294             /*
 295              * Block 8 is a big kludge to add stereo support to block 1 :
 296              * A block of type 8 is always followed by a block of type 1
 297              * and specifies the number of channels in that 1-block
 298              * (normally block 1 are always mono). In practice, block type 9
 299              * is used for stereo rather than 8
 300              */
 301             if( ( i_block_size != 4 )
 302              || ( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 ) )
 303                 goto corrupt;
 304
 305             if( buf[2] )
 306             {
 307                 msg_Err( p_demux, "unsupported compression" );
 308                 return VLC_EGENERIC;
 309             }
 310
 311             new_fmt.i_codec = VLC_CODEC_U8;
 312             if (buf[3] >= 32)
 313                 goto corrupt;
 314             new_fmt.audio.i_channels = buf[3] + 1; /* can't be nul */
 315             new_fmt.audio.i_rate = 256000000L /
 316                           ((65536L - GetWLE(buf)) * new_fmt.audio.i_channels);
 317             new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels;
 318             new_fmt.audio.i_frame_length = 1;
 319             new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
 320             new_fmt.audio.i_bitspersample = 8 * new_fmt.audio.i_bytes_per_frame;
 321             new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
 322
 323             /* read subsequent block 1 */
 324             if( vlc_stream_Read( p_demux->s, buf, 4 ) < 4 )
 325                 return VLC_EGENERIC; /* EOF */
 326
 327             i_block_size = GetDWLE( buf ) >> 8;
 328             msg_Dbg( p_demux, "new block: type: %u, size: %u",
 329                     (unsigned)*buf, i_block_size );
 330             if( i_block_size < 2 )
 331                 goto corrupt;
 332             i_block_size -= 2;
 333
 334             if( vlc_stream_Read( p_demux->s, buf, 2 ) < 2 )
 335                 goto corrupt;
 336
 337             if( buf[1] )
 338             {
 339                 msg_Err( p_demux, "unsupported compression" );
 340                 return VLC_EGENERIC;
 341             }
 342
 343             break;
 344
 345         case 9: /* newer data block with channel number and bits resolution */
 346             if( i_block_size < 12 )
 347                 goto corrupt;
 348             i_block_size -= 12;
 349
 350             if( ( vlc_stream_Read( p_demux->s, buf, 8 ) < 8 )
 351              || ( vlc_stream_Read( p_demux->s, NULL, 4 ) < 4 ) )
 352                 goto corrupt;
 353
 354             new_fmt.audio.i_rate = GetDWLE( buf );
 355             new_fmt.audio.i_bitspersample = buf[4];
 356             new_fmt.audio.i_channels = buf[5];
 357
 358             switch( GetWLE( &buf[6] ) ) /* format */
 359             {
 360                 case 0x0000: /* PCM */
 361                     switch( new_fmt.audio.i_bitspersample )
 362                     {
 363                         case 8:
 364                             new_fmt.i_codec = VLC_CODEC_U8;
 365                             break;
 366
 367                         case 16:
 368                             new_fmt.i_codec = VLC_CODEC_U16L;
 369                             break;
 370
 371                         default:
 372                             msg_Err( p_demux, "unsupported bit res.: %u bits",
 373                                      new_fmt.audio.i_bitspersample );
 374                             return VLC_EGENERIC;
 375                     }
 376                     break;
 377
 378                 case 0x0004: /* signed */
 379                     switch( new_fmt.audio.i_bitspersample )
 380                     {
 381                         case 8:
 382                             new_fmt.i_codec = VLC_CODEC_S8;
 383                             break;
 384
 385                         case 16:
 386                             new_fmt.i_codec = VLC_CODEC_S16L;
 387                             break;
 388
 389                         default:
 390                             msg_Err( p_demux, "unsupported bit res.: %u bits",
 391                                      new_fmt.audio.i_bitspersample );
 392                             return VLC_EGENERIC;
 393                     }
 394                     break;
 395
 396                 default:
 397                     msg_Err( p_demux, "unsupported compression" );
 398                     return VLC_EGENERIC;
 399             }
 400
 401             if( new_fmt.audio.i_channels == 0 )
 402             {
 403                 msg_Err( p_demux, "0 channels detected" );
 404                 return VLC_EGENERIC;
 405             }
 406
 407             new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels
 408                 * (new_fmt.audio.i_bitspersample / 8);
 409             new_fmt.audio.i_frame_length = 1;
 410             new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
 411             new_fmt.i_bitrate = 8 * new_fmt.audio.i_rate
 412                                      * new_fmt.audio.i_bytes_per_frame;
 413             break;
 414
 415         default:
 416             msg_Dbg( p_demux, "unknown block type %u - skipping block",
 417                      (unsigned)*buf);
 418             /* fall through */
 419         case 4: /* blocks of non-audio types can be skipped */
 420         case 5:
 421             if( vlc_stream_Read( p_demux->s, NULL,
 422                                  i_block_size ) < i_block_size )
 423                 goto corrupt;
 424             i_block_size = 0;
 425             break;
 426     }
 427
 428     p_sys->i_block_start = vlc_stream_Tell( p_demux->s );
 429     p_sys->i_block_end = p_sys->i_block_start + i_block_size;
 430
 431     if( i_block_size || p_sys->i_silence_countdown )
 432     {
 433         /* we've read a block with data in it - update decoder */
 434         msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
 435                  "freq: %d Hz, bitrate: %dKo/s, blockalign: %d, "
 436                  "bits/samples: %d", (char *)&new_fmt.i_codec,
 437                  new_fmt.audio.i_channels, new_fmt.audio.i_rate,
 438                  new_fmt.i_bitrate / 8192, new_fmt.audio.i_blockalign,
 439                  new_fmt.audio.i_bitspersample );
 440
 441         if( ( p_sys->p_es != NULL ) && fmtcmp( &p_sys->fmt, &new_fmt ) )
 442         {
 443             msg_Dbg( p_demux, "codec change needed" );
 444             es_out_Del( p_demux->out, p_sys->p_es );
 445             p_sys->p_es = NULL;
 446         }
 447
 448         if( p_sys->p_es == NULL )
 449         {
 450             memcpy( &p_sys->fmt, &new_fmt, sizeof( p_sys->fmt ) );
 451             date_Change( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
 452             p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
 453         }
 454     }
 455
 456     return VLC_SUCCESS;
 457
 458 corrupt:
 459     msg_Err( p_demux, "corrupted file - halting demux" );
 460     return VLC_EGENERIC;
 461 }
 462
 463 /*****************************************************************************
 464  * Demux: read packet and send them to decoders
 465  *****************************************************************************
 466  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 467  *****************************************************************************/
 468 #define MAX_READ_FRAME 1000
 469 static int Demux( demux_t *p_demux )
 470 {
 471     demux_sys_t *p_sys = p_demux->p_sys;
 472     block_t     *p_block;
 473     int64_t     i_read_frames;
 474
 475     if( p_sys->i_silence_countdown == 0 )
 476     {
 477         int64_t i_offset = vlc_stream_Tell( p_demux->s );
 478         if( i_offset >= p_sys->i_block_end )
 479         {
 480             if( ReadBlockHeader( p_demux ) != VLC_SUCCESS )
 481                 return 0;
 482             return 1;
 483         }
 484
 485         i_read_frames = ( p_sys->i_block_end - i_offset )
 486                       / p_sys->fmt.audio.i_bytes_per_frame;
 487
 488         if( i_read_frames > MAX_READ_FRAME )
 489             i_read_frames = MAX_READ_FRAME;
 490
 491         p_block = vlc_stream_Block( p_demux->s,
 492                                     p_sys->fmt.audio.i_bytes_per_frame
 493                                     * i_read_frames );
 494         if( p_block == NULL )
 495         {
 496             msg_Warn( p_demux, "cannot read data" );
 497             return 0;
 498         }
 499     }
 500     else
 501     {   /* emulates silence from the stream */
 502         i_read_frames = p_sys->i_silence_countdown;
 503         if( i_read_frames > MAX_READ_FRAME )
 504             i_read_frames = MAX_READ_FRAME;
 505
 506         p_block = block_Alloc( i_read_frames );
 507         if( p_block == NULL )
 508             return VLC_ENOMEM;
 509
 510         memset( p_block->p_buffer, 0, i_read_frames );
 511         p_sys->i_silence_countdown -= i_read_frames;
 512     }
 513
 514     p_block->i_dts = p_block->i_pts = VLC_TS_0 + date_Get( &p_sys->pts );
 515     p_block->i_nb_samples = i_read_frames * p_sys->fmt.audio.i_frame_length;
 516     date_Increment( &p_sys->pts, p_block->i_nb_samples );
 517     es_out_SetPCR( p_demux->out, p_block->i_pts );
 518     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 519
 520     return 1;
 521 }
 522
 523 /*****************************************************************************
 524  * Close: frees unused data
 525  *****************************************************************************/
 526 static void Close ( vlc_object_t * p_this )
 527 {
 528     demux_sys_t *p_sys  = ((demux_t *)p_this)->p_sys;
 529
 530     free( p_sys );
 531 }
 532
 533 /*****************************************************************************
 534  * Control:
 535  *****************************************************************************/
 536 static int Control( demux_t *p_demux, int i_query, va_list args )
 537 {
 538     demux_sys_t *p_sys  = p_demux->p_sys;
 539
 540     return demux_vaControlHelper( p_demux->s, p_sys->i_block_start,
 541                                    p_sys->i_block_end,
 542                                    p_sys->fmt.i_bitrate,
 543                                    p_sys->fmt.audio.i_blockalign,
 544                                    i_query, args );
 545 }