git.sesse.net Git - vlc/blob - 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
  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 /*****************************************************************************
  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( 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( 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( 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 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( stream_Read( p_demux->s, buf, 2 ) < 2 )
 188                 goto corrupt;
 189
 190             if( buf[1] )
 191             {
 192                 msg_Err( p_demux, "unsupported compression" );
 193                 return VLC_EGENERIC;
 194             }
 195
 196             new_fmt.i_codec = VLC_CODEC_U8;
 197             new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
 198             new_fmt.audio.i_bytes_per_frame = 1;
 199             new_fmt.audio.i_frame_length = 1;
 200             new_fmt.audio.i_channels = 1;
 201             new_fmt.audio.i_blockalign = 1;
 202             new_fmt.audio.i_bitspersample = 8;
 203             new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
 204             break;
 205
 206         case 2: /* data block with same format as the previous one */
 207             if( p_sys->p_es == NULL )
 208                 goto corrupt; /* no previous block! */
 209
 210             memcpy( &new_fmt, &p_sys->fmt, sizeof( new_fmt ) );
 211             break;
 212
 213         case 3: /* silence block */
 214             if( ( i_block_size != 3 )
 215              || ( stream_Read( p_demux->s, buf, 3 ) < 3 ) )
 216                 goto corrupt;
 217
 218             i_block_size = 0;
 219             p_sys->i_silence_countdown = GetWLE( buf );
 220
 221             new_fmt.i_codec = VLC_CODEC_U8;
 222             new_fmt.audio.i_rate = fix_voc_sr( 1000000L / (256L - buf[0]) );
 223             new_fmt.audio.i_bytes_per_frame = 1;
 224             new_fmt.audio.i_frame_length = 1;
 225             new_fmt.audio.i_channels = 1;
 226             new_fmt.audio.i_blockalign = 1;
 227             new_fmt.audio.i_bitspersample = 8;
 228             new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
 229             break;
 230
 231         case 6: /* repeat block */
 232             if( ( i_block_size != 2 )
 233              || ( stream_Read( p_demux->s, buf, 2 ) < 2 ) )
 234                 goto corrupt;
 235
 236             i_block_size = 0;
 237             p_sys->i_loop_count = GetWLE( buf );
 238             p_sys->i_loop_offset = stream_Tell( p_demux->s );
 239             break;
 240
 241         case 7: /* repeat end block */
 242             if( i_block_size != 0 )
 243                 goto corrupt;
 244
 245             if( p_sys->i_loop_count > 0 )
 246             {
 247                 if( stream_Seek( p_demux->s, p_sys->i_loop_offset ) )
 248                     msg_Warn( p_demux, "cannot loop: seek failed" );
 249                 else
 250                     p_sys->i_loop_count--;
 251             }
 252             break;
 253
 254         case 8:
 255             /*
 256              * Block 8 is a big kludge to add stereo support to block 1 :
 257              * A block of type 8 is always followed by a block of type 1
 258              * and specifies the number of channels in that 1-block
 259              * (normally block 1 are always mono). In practice, block type 9
 260              * is used for stereo rather than 8
 261              */
 262             if( ( i_block_size != 4 )
 263              || ( stream_Read( p_demux->s, buf, 4 ) < 4 ) )
 264                 goto corrupt;
 265
 266             if( buf[2] )
 267             {
 268                 msg_Err( p_demux, "unsupported compression" );
 269                 return VLC_EGENERIC;
 270             }
 271
 272             new_fmt.i_codec = VLC_CODEC_U8;
 273             new_fmt.audio.i_channels = buf[3] + 1; /* can't be nul */
 274             new_fmt.audio.i_rate = 256000000L /
 275                           ((65536L - GetWLE(buf)) * new_fmt.audio.i_channels);
 276             new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels;
 277             new_fmt.audio.i_frame_length = 1;
 278             new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
 279             new_fmt.audio.i_bitspersample = 8 * new_fmt.audio.i_bytes_per_frame;
 280             new_fmt.i_bitrate = new_fmt.audio.i_rate * 8;
 281
 282             /* read subsequent block 1 */
 283             if( stream_Read( p_demux->s, buf, 4 ) < 4 )
 284                 return VLC_EGENERIC; /* EOF */
 285
 286             i_block_size = GetDWLE( buf ) >> 8;
 287             msg_Dbg( p_demux, "new block: type: %u, size: %u",
 288                     (unsigned)*buf, i_block_size );
 289             if( i_block_size < 2 )
 290                 goto corrupt;
 291             i_block_size -= 2;
 292
 293             if( stream_Read( p_demux->s, buf, 2 ) < 2 )
 294                 goto corrupt;
 295
 296             if( buf[1] )
 297             {
 298                 msg_Err( p_demux, "unsupported compression" );
 299                 return VLC_EGENERIC;
 300             }
 301
 302             break;
 303
 304         case 9: /* newer data block with channel number and bits resolution */
 305             if( i_block_size < 12 )
 306                 goto corrupt;
 307             i_block_size -= 12;
 308
 309             if( ( stream_Read( p_demux->s, buf, 8 ) < 8 )
 310              || ( stream_Read( p_demux->s, NULL, 4 ) < 4 ) )
 311                 goto corrupt;
 312
 313             new_fmt.audio.i_rate = GetDWLE( buf );
 314             new_fmt.audio.i_bitspersample = buf[4];
 315             new_fmt.audio.i_channels = buf[5];
 316
 317             switch( GetWLE( &buf[6] ) ) /* format */
 318             {
 319                 case 0x0000: /* PCM */
 320                     switch( new_fmt.audio.i_bitspersample )
 321                     {
 322                         case 8:
 323                             new_fmt.i_codec = VLC_CODEC_U8;
 324                             break;
 325
 326                         case 16:
 327                             new_fmt.i_codec = VLC_CODEC_U16L;
 328                             break;
 329
 330                         default:
 331                             msg_Err( p_demux, "unsupported bit res.: %u bits",
 332                                      new_fmt.audio.i_bitspersample );
 333                             return VLC_EGENERIC;
 334                     }
 335                     break;
 336
 337                 case 0x0004: /* signed */
 338                     switch( new_fmt.audio.i_bitspersample )
 339                     {
 340                         case 8:
 341                             new_fmt.i_codec = VLC_CODEC_S8;
 342                             break;
 343
 344                         case 16:
 345                             new_fmt.i_codec = VLC_CODEC_S16L;
 346                             break;
 347
 348                         default:
 349                             msg_Err( p_demux, "unsupported bit res.: %u bits",
 350                                      new_fmt.audio.i_bitspersample );
 351                             return VLC_EGENERIC;
 352                     }
 353                     break;
 354
 355                 default:
 356                     msg_Err( p_demux, "unsupported compression" );
 357                     return VLC_EGENERIC;
 358             }
 359
 360             new_fmt.audio.i_bytes_per_frame = new_fmt.audio.i_channels
 361                 * (new_fmt.audio.i_bitspersample / 8);
 362             new_fmt.audio.i_frame_length = 1;
 363             new_fmt.audio.i_blockalign = new_fmt.audio.i_bytes_per_frame;
 364             new_fmt.i_bitrate = 8 * new_fmt.audio.i_rate
 365                                      * new_fmt.audio.i_bytes_per_frame;
 366             break;
 367
 368         default:
 369             msg_Dbg( p_demux, "unknown block type %u - skipping block",
 370                      (unsigned)*buf);
 371         case 4: /* blocks of non-audio types can be skipped */
 372         case 5:
 373             if( stream_Read( p_demux->s, NULL, i_block_size ) < i_block_size )
 374                 goto corrupt;
 375             i_block_size = 0;
 376             break;
 377     }
 378
 379     p_sys->i_block_start = stream_Tell( p_demux->s );
 380     p_sys->i_block_end = p_sys->i_block_start + i_block_size;
 381
 382     if( i_block_size || p_sys->i_silence_countdown )
 383     {
 384         /* we've read a block with data in it - update decoder */
 385         msg_Dbg( p_demux, "fourcc: %4.4s, channels: %d, "
 386                  "freq: %d Hz, bitrate: %dKo/s, blockalign: %d, "
 387                  "bits/samples: %d", (char *)&new_fmt.i_codec,
 388                  new_fmt.audio.i_channels, new_fmt.audio.i_rate,
 389                  new_fmt.i_bitrate / 8192, new_fmt.audio.i_blockalign,
 390                  new_fmt.audio.i_bitspersample );
 391
 392         if( ( p_sys->p_es != NULL ) && fmtcmp( &p_sys->fmt, &new_fmt ) )
 393         {
 394             msg_Dbg( p_demux, "codec change needed" );
 395             es_out_Del( p_demux->out, p_sys->p_es );
 396             p_sys->p_es = NULL;
 397         }
 398
 399         if( p_sys->p_es == NULL )
 400         {
 401             memcpy( &p_sys->fmt, &new_fmt, sizeof( p_sys->fmt ) );
 402             date_Change( &p_sys->pts, p_sys->fmt.audio.i_rate, 1 );
 403             p_sys->p_es = es_out_Add( p_demux->out, &p_sys->fmt );
 404         }
 405     }
 406
 407     return VLC_SUCCESS;
 408
 409 corrupt:
 410     msg_Err( p_demux, "corrupted file - halting demux" );
 411     return VLC_EGENERIC;
 412 }
 413
 414 /*****************************************************************************
 415  * Demux: read packet and send them to decoders
 416  *****************************************************************************
 417  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
 418  *****************************************************************************/
 419 #define SAMPLES_BUFFER 1000
 420 static int Demux( demux_t *p_demux )
 421 {
 422     demux_sys_t *p_sys = p_demux->p_sys;
 423     block_t     *p_block;
 424     int64_t     i_offset, i;
 425
 426     i_offset = stream_Tell( p_demux->s );
 427
 428     while( ( i_offset >= p_sys->i_block_end )
 429          && ( p_sys->i_silence_countdown == 0 ) )
 430         if( ReadBlockHeader( p_demux ) != VLC_SUCCESS )
 431             return 0;
 432
 433     if( p_sys->i_silence_countdown == 0 )
 434     {
 435         i = ( p_sys->i_block_end - i_offset )
 436             / p_sys->fmt.audio.i_bytes_per_frame;
 437         if( i > SAMPLES_BUFFER )
 438             i = SAMPLES_BUFFER;
 439
 440         p_block = stream_Block( p_demux->s,
 441                                 p_sys->fmt.audio.i_bytes_per_frame * i );
 442         if( p_block == NULL )
 443         {
 444             msg_Warn( p_demux, "cannot read data" );
 445             return 0;
 446         }
 447     }
 448     else
 449     {   /* emulates silence from the stream */
 450         i = p_sys->i_silence_countdown;
 451         if( i > SAMPLES_BUFFER )
 452             i = SAMPLES_BUFFER;
 453
 454         p_block = block_New( p_demux, i );
 455         if( p_block == NULL )
 456             return VLC_ENOMEM;
 457
 458         memset( p_block->p_buffer, 0, i );
 459         p_sys->i_silence_countdown -= i;
 460     }
 461
 462     p_block->i_dts = p_block->i_pts = VLC_TS_0 + date_Get( &p_sys->pts );
 463
 464     es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block->i_pts );
 465
 466     es_out_Send( p_demux->out, p_sys->p_es, p_block );
 467
 468     date_Increment( &p_sys->pts, p_sys->fmt.audio.i_frame_length * i );
 469
 470     return 1;
 471 }
 472
 473 /*****************************************************************************
 474  * Close: frees unused data
 475  *****************************************************************************/
 476 static void Close ( vlc_object_t * p_this )
 477 {
 478     demux_sys_t *p_sys  = ((demux_t *)p_this)->p_sys;
 479
 480     free( p_sys );
 481 }
 482
 483 /*****************************************************************************
 484  * Control:
 485  *****************************************************************************/
 486 static int Control( demux_t *p_demux, int i_query, va_list args )
 487 {
 488     demux_sys_t *p_sys  = p_demux->p_sys;
 489
 490     return demux_vaControlHelper( p_demux->s, p_sys->i_block_start,
 491                                    p_sys->i_block_end,
 492                                    p_sys->fmt.i_bitrate,
 493                                    p_sys->fmt.audio.i_blockalign,
 494                                    i_query, args );
 495 }