2
** Copyright (C) 2001-2004 Erik de Castro Lopo <erikd@mega-nerd.com>
4
** This program is free software; you can redistribute it and/or modify
5
** it under the terms of the GNU Lesser General Public License as published by
6
** the Free Software Foundation; either version 2.1 of the License, or
7
** (at your option) any later version.
9
** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
11
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
** GNU Lesser General Public License for more details.
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** You should have received a copy of the GNU Lesser General Public License
15
** along with this program; if not, write to the Free Software
16
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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** The VOC file format is the most brain damaged format I have yet had to deal
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** with. No one programmer could have bee stupid enough to put this together.
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** Instead it looks like a series of manic, dyslexic assembly language programmers
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** hacked it to fit their needs.
38
/*------------------------------------------------------------------------------
39
* Typedefs for file chunks.
42
#define VOC_MAX_SECTIONS 200
47
VOC_SOUND_CONTINUE = 2,
59
int offset ; /* Offset of zero => silence. */
63
{ unsigned int sections, section_types ;
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int samplerate, channels, bitwidth ;
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SND_DATA_BLOCKS blocks [VOC_MAX_SECTIONS] ;
68
/*------------------------------------------------------------------------------
69
* Private static functions.
72
static int voc_close (SF_PRIVATE *psf) ;
73
static int voc_write_header (SF_PRIVATE *psf, int calc_length) ;
74
static int voc_read_header (SF_PRIVATE *psf) ;
76
static const char* voc_encoding2str (int encoding) ;
80
/* These functions would be required for files with more than one VOC_SOUND_DATA
81
** segment. Not sure whether to bother implementing this.
84
static int voc_multi_init (SF_PRIVATE *psf, VOC_DATA *pvoc) ;
86
static int voc_multi_read_uc2s (SF_PRIVATE *psf, short *ptr, int len) ;
87
static int voc_multi_read_les2s (SF_PRIVATE *psf, short *ptr, int len) ;
89
static int voc_multi_read_uc2i (SF_PRIVATE *psf, int *ptr, int len) ;
90
static int voc_multi_read_les2i (SF_PRIVATE *psf, int *ptr, int len) ;
92
static int voc_multi_read_uc2f (SF_PRIVATE *psf, float *ptr, int len) ;
93
static int voc_multi_read_les2f (SF_PRIVATE *psf, float *ptr, int len) ;
95
static int voc_multi_read_uc2d (SF_PRIVATE *psf, double *ptr, int len) ;
96
static int voc_multi_read_les2d (SF_PRIVATE *psf, double *ptr, int len) ;
99
/*------------------------------------------------------------------------------
104
voc_open (SF_PRIVATE *psf)
105
{ int subformat, error = 0 ;
108
return SFE_VOC_NO_PIPE ;
110
if (psf->mode == SFM_READ || (psf->mode == SFM_RDWR && psf->filelength > 0))
111
{ if ((error = voc_read_header (psf)))
115
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
117
if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR)
118
{ if ((psf->sf.format & SF_FORMAT_TYPEMASK) != SF_FORMAT_VOC)
119
return SFE_BAD_OPEN_FORMAT ;
121
psf->endian = SF_ENDIAN_LITTLE ;
123
if ((error = voc_write_header (psf, SF_FALSE)))
126
psf->write_header = voc_write_header ;
129
psf->blockwidth = psf->bytewidth * psf->sf.channels ;
131
psf->container_close = voc_close ;
134
{ case SF_FORMAT_PCM_U8 :
135
case SF_FORMAT_PCM_16 :
136
error = pcm_init (psf) ;
139
case SF_FORMAT_ALAW :
140
error = alaw_init (psf) ;
143
case SF_FORMAT_ULAW :
144
error = ulaw_init (psf) ;
147
default : return SFE_UNIMPLEMENTED ;
153
/*------------------------------------------------------------------------------
157
voc_read_header (SF_PRIVATE *psf)
160
unsigned char block_type, rate_byte ;
161
short version, checksum, encoding, dataoffset ;
164
/* Set position to start of file to begin reading header. */
165
offset = psf_binheader_readf (psf, "pb", 0, creative, SIGNED_SIZEOF (creative)) ;
167
if (creative [sizeof (creative) - 1] != 0x1A)
168
return SFE_VOC_NO_CREATIVE ;
170
/* Terminate the string. */
171
creative [sizeof (creative) - 1] = 0 ;
173
if (strcmp ("Creative Voice File", creative))
174
return SFE_VOC_NO_CREATIVE ;
176
psf_log_printf (psf, "%s\n", creative) ;
178
offset += psf_binheader_readf (psf, "e222", &dataoffset, &version, &checksum) ;
180
psf->dataoffset = dataoffset ;
182
psf_log_printf (psf, "dataoffset : %d\n"
184
"checksum : 0x%X\n", psf->dataoffset, version, checksum) ;
186
if (version != 0x010A && version != 0x0114)
187
return SFE_VOC_BAD_VERSION ;
189
if (! (psf->fdata = malloc (sizeof (VOC_DATA))))
190
return SFE_MALLOC_FAILED ;
192
pvoc = (VOC_DATA*) psf->fdata ;
194
memset (pvoc, 0, sizeof (VOC_DATA)) ;
196
/* Set the default encoding now. */
197
psf->sf.format = SF_FORMAT_VOC ; /* Major format */
198
encoding = SF_FORMAT_PCM_U8 ; /* Minor format */
199
psf->endian = SF_ENDIAN_LITTLE ;
202
{ offset += psf_binheader_readf (psf, "1", &block_type) ;
208
offset += psf_binheader_readf (psf, "e3", &size) ;
210
psf_log_printf (psf, " ASCII : %d\n", size) ;
212
offset += psf_binheader_readf (psf, "b", psf->header, size) ;
213
psf->header [size] = 0 ;
214
psf_log_printf (psf, " text : %s\n", psf->header) ;
218
case VOC_SOUND_DATA :
220
case VOC_EXTENDED_II :
223
default : psf_log_printf (psf, "*** Weird block marker (%d)\n", block_type) ;
229
if (block_type == VOC_SOUND_DATA)
230
{ unsigned char compression ;
233
offset += psf_binheader_readf (psf, "e311", &size, &rate_byte, &compression) ;
235
psf->sf.samplerate = 1000000 / (256 - (rate_byte & 0xFF)) ;
237
psf_log_printf (psf, " Sound Data : %d\n sr : %d => %dHz\n comp : %d\n",
238
size, rate_byte, psf->sf.samplerate, compression) ;
240
if (offset + size - 1 > psf->filelength)
241
{ psf_log_printf (psf, "Seems to be a truncated file.\n") ;
242
psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ;
243
return SFE_VOC_BAD_SECTIONS ;
245
else if (offset + size - 1 < psf->filelength)
246
{ psf_log_printf (psf, "Seems to be a multi-segment file (#1).\n") ;
247
psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ;
248
return SFE_VOC_BAD_SECTIONS ;
251
psf->dataoffset = offset ;
252
psf->dataend = psf->filelength - 1 ;
254
psf->sf.channels = 1 ;
257
psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_U8 ;
262
if (block_type == VOC_EXTENDED)
263
{ unsigned char pack, stereo, compression ;
264
unsigned short rate_short ;
267
offset += psf_binheader_readf (psf, "e3211", &size, &rate_short, &pack, &stereo) ;
269
psf_log_printf (psf, " Extended : %d\n", size) ;
271
psf_log_printf (psf, " size : 4\n") ;
273
psf_log_printf (psf, " size : %d (should be 4)\n", size) ;
275
psf_log_printf (psf, " pack : %d\n"
276
" stereo : %s\n", pack, (stereo ? "yes" : "no")) ;
279
{ psf->sf.channels = 2 ;
280
psf->sf.samplerate = 128000000 / (65536 - rate_short) ;
283
{ psf->sf.channels = 1 ;
284
psf->sf.samplerate = 256000000 / (65536 - rate_short) ;
287
psf_log_printf (psf, " sr : %d => %dHz\n", (rate_short & 0xFFFF), psf->sf.samplerate) ;
289
offset += psf_binheader_readf (psf, "1", &block_type) ;
291
if (block_type != VOC_SOUND_DATA)
292
{ psf_log_printf (psf, "*** Expecting VOC_SOUND_DATA section.\n") ;
293
return SFE_VOC_BAD_FORMAT ;
296
offset += psf_binheader_readf (psf, "e311", &size, &rate_byte, &compression) ;
298
psf_log_printf (psf, " Sound Data : %d\n"
300
" comp : %d\n", size, rate_byte, compression) ;
303
if (offset + size - 1 > psf->filelength)
304
{ psf_log_printf (psf, "Seems to be a truncated file.\n") ;
305
psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ;
306
return SFE_VOC_BAD_SECTIONS ;
308
else if (offset + size - 1 < psf->filelength)
309
{ psf_log_printf (psf, "Seems to be a multi-segment file (#2).\n") ;
310
psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ;
311
return SFE_VOC_BAD_SECTIONS ;
314
psf->dataoffset = offset ;
315
psf->dataend = psf->filelength - 1 ;
319
psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_U8 ;
324
if (block_type == VOC_EXTENDED_II)
325
{ unsigned char bitwidth, channels ;
326
int size, fourbytes ;
328
offset += psf_binheader_readf (psf, "e341124", &size, &psf->sf.samplerate,
329
&bitwidth, &channels, &encoding, &fourbytes) ;
331
if (size * 2 == psf->filelength - 39)
332
{ int temp_size = psf->filelength - 31 ;
334
psf_log_printf (psf, " Extended II : %d (SoX bug: should be %d)\n", size, temp_size) ;
338
psf_log_printf (psf, " Extended II : %d\n", size) ;
340
psf_log_printf (psf, " sample rate : %d\n"
342
" channels : %d\n", psf->sf.samplerate, bitwidth, channels) ;
344
if (bitwidth == 16 && encoding == 0)
346
psf_log_printf (psf, " encoding : 0 (SoX bug: should be 4 for 16 bit signed PCM)\n") ;
349
psf_log_printf (psf, " encoding : %d => %s\n", encoding, voc_encoding2str (encoding)) ;
352
psf_log_printf (psf, " fourbytes : %X\n", fourbytes) ;
354
psf->sf.channels = channels ;
356
psf->dataoffset = offset ;
357
psf->dataend = psf->filelength - 1 ;
359
if (size + 31 == psf->filelength + 1)
360
{ /* Hack for reading files produced using
361
** sf_command (SFC_UPDATE_HEADER_NOW).
363
psf_log_printf (psf, "Missing zero byte at end of file.\n") ;
364
size = psf->filelength - 30 ;
367
else if (size + 31 > psf->filelength)
368
{ psf_log_printf (psf, "Seems to be a truncated file.\n") ;
369
size = psf->filelength - 31 ;
371
else if (size + 31 < psf->filelength)
372
psf_log_printf (psf, "Seems to be a multi-segment file (#3).\n") ;
376
psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_U8 ;
381
psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_16 ;
386
psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_ALAW ;
391
psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_ULAW ;
395
default : /* Unknown */
396
return SFE_UNKNOWN_FORMAT ;
403
} /* voc_read_header */
405
/*====================================================================================
409
voc_write_header (SF_PRIVATE *psf, int calc_length)
410
{ sf_count_t current ;
411
int rate_const, subformat ;
413
current = psf_ftell (psf) ;
416
{ psf->filelength = psf_get_filelen (psf) ;
418
psf->datalength = psf->filelength - psf->dataoffset ;
420
psf->datalength -= psf->filelength - psf->dataend ;
422
psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
425
subformat = psf->sf.format & SF_FORMAT_SUBMASK ;
426
/* Reset the current header length to zero. */
427
psf->header [0] = 0 ;
429
psf_fseek (psf, 0, SEEK_SET) ;
431
/* VOC marker and 0x1A byte. */
432
psf_binheader_writef (psf, "eb1", "Creative Voice File", 19, 0x1A) ;
434
/* Data offset, version and other. */
435
psf_binheader_writef (psf, "e222", 26, 0x0114, 0x111F) ;
437
/* Use same logic as SOX.
438
** If the file is mono 8 bit data, use VOC_SOUND_DATA.
439
** If the file is mono 16 bit data, use VOC_EXTENED.
440
** Otherwise use VOC_EXTENED_2.
443
if (subformat == SF_FORMAT_PCM_U8 && psf->sf.channels == 1)
444
{ /* samplerate = 1000000 / (256 - rate_const) ; */
445
rate_const = 256 - 1000000 / psf->sf.samplerate ;
447
/* First type marker, length, rate_const and compression */
448
psf_binheader_writef (psf, "e1311", VOC_SOUND_DATA, (int) (psf->datalength + 1), rate_const, 0) ;
450
else if (subformat == SF_FORMAT_PCM_U8 && psf->sf.channels == 2)
451
{ /* sample_rate = 128000000 / (65536 - rate_short) ; */
452
rate_const = 65536 - 128000000 / psf->sf.samplerate ;
454
/* First write the VOC_EXTENDED section
455
** marker, length, rate_const and compression
457
psf_binheader_writef (psf, "e13211", VOC_EXTENDED, 4, rate_const, 0, 1) ;
459
/* samplerate = 1000000 / (256 - rate_const) ; */
460
rate_const = 256 - 1000000 / psf->sf.samplerate ;
462
/* Now write the VOC_SOUND_DATA section
463
** marker, length, rate_const and compression
465
psf_binheader_writef (psf, "e1311", VOC_SOUND_DATA, (int) (psf->datalength + 1), rate_const, 0) ;
470
if (psf->sf.channels < 1 || psf->sf.channels > 2)
471
return SFE_CHANNEL_COUNT ;
474
{ case SF_FORMAT_PCM_U8 :
476
length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ;
477
/* Marker, length, sample rate, bitwidth, stereo flag, encoding and fourt zero bytes. */
478
psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 16, psf->sf.channels, 4, 0) ;
481
case SF_FORMAT_PCM_16 :
483
length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ;
484
/* Marker, length, sample rate, bitwidth, stereo flag, encoding and fourt zero bytes. */
485
psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 16, psf->sf.channels, 4, 0) ;
488
case SF_FORMAT_ALAW :
490
length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ;
491
psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 8, psf->sf.channels, 6, 0) ;
494
case SF_FORMAT_ULAW :
496
length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ;
497
psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 8, psf->sf.channels, 7, 0) ;
500
default : return SFE_UNIMPLEMENTED ;
504
psf_fwrite (psf->header, psf->headindex, 1, psf) ;
509
psf->dataoffset = psf->headindex ;
512
psf_fseek (psf, current, SEEK_SET) ;
515
} /* voc_write_header */
518
voc_close (SF_PRIVATE *psf)
520
if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR)
521
{ /* Now we know for certain the length of the file we can re-write
522
** correct values for the FORM, 8SVX and BODY chunks.
524
unsigned byte = VOC_TERMINATOR ;
527
psf_fseek (psf, 0, SEEK_END) ;
529
/* Write terminator */
530
psf_fwrite (&byte, 1, 1, psf) ;
532
voc_write_header (psf, SF_TRUE) ;
539
voc_encoding2str (int encoding)
542
{ case 0 : return "8 bit unsigned PCM" ;
543
case 4 : return "16 bit signed PCM" ;
544
case 6 : return "A-law" ;
545
case 7 : return "u-law" ;
548
return "*** Unknown ***" ;
549
} /* voc_encoding2str */
551
/*====================================================================================
556
voc_multi_init (SF_PRIVATE *psf, VOC_DATA *pvoc)
560
if (pvoc->bitwidth == 8)
561
{ psf->read_short = voc_multi_read_uc2s ;
562
psf->read_int = voc_multi_read_uc2i ;
563
psf->read_float = voc_multi_read_uc2f ;
564
psf->read_double = voc_multi_read_uc2d ;
568
if (pvoc->bitwidth == 16)
569
{ psf->read_short = voc_multi_read_les2s ;
570
psf->read_int = voc_multi_read_les2i ;
571
psf->read_float = voc_multi_read_les2f ;
572
psf->read_double = voc_multi_read_les2d ;
576
psf_log_printf (psf, "Error : bitwith != 8 && bitwidth != 16.\n") ;
578
return SFE_UNIMPLEMENTED ;
579
} /* voc_multi_read_int */
581
/*------------------------------------------------------------------------------------
585
voc_multi_read_uc2s (SF_PRIVATE *psf, short *ptr, int len)
589
} /* voc_multi_read_uc2s */
592
voc_multi_read_les2s (SF_PRIVATE *psf, short *ptr, int len)
596
} /* voc_multi_read_les2s */
600
voc_multi_read_uc2i (SF_PRIVATE *psf, int *ptr, int len)
604
} /* voc_multi_read_uc2i */
607
voc_multi_read_les2i (SF_PRIVATE *psf, int *ptr, int len)
611
} /* voc_multi_read_les2i */
615
voc_multi_read_uc2f (SF_PRIVATE *psf, float *ptr, int len)
619
} /* voc_multi_read_uc2f */
622
voc_multi_read_les2f (SF_PRIVATE *psf, float *ptr, int len)
626
} /* voc_multi_read_les2f */
630
voc_multi_read_uc2d (SF_PRIVATE *psf, double *ptr, int len)
634
} /* voc_multi_read_uc2d */
637
voc_multi_read_les2d (SF_PRIVATE *psf, double *ptr, int len)
641
} /* voc_multi_read_les2d */
645
/*------------------------------------------------------------------------------------
647
Creative Voice (VOC) file format
648
--------------------------------
650
~From: galt@dsd.es.com
652
(byte numbers are hex!)
655
Series of DATA BLOCKS (bytes 1A+) [Must end w/ Terminator Block]
657
- ---------------------------------------------------------------
662
------ ------------------------------------------
663
00-12 "Creative Voice File"
664
13 1A (eof to abort printing of file)
665
14-15 Offset of first datablock in .voc file (std 1A 00
667
16-17 Version number (minor,major) (VOC-HDR puts 0A 01)
668
18-19 1's Comp of Ver. # + 1234h (VOC-HDR puts 29 11)
670
- ---------------------------------------------------------------
675
Data Block: TYPE(1-byte), SIZE(3-bytes), INFO(0+ bytes)
676
NOTE: Terminator Block is an exception -- it has only the TYPE byte.
678
TYPE Description Size (3-byte int) Info
679
---- ----------- ----------------- -----------------------
680
00 Terminator (NONE) (NONE)
681
01 Sound data 2+length of data *
682
02 Sound continue length of data Voice Data
684
04 Marker 2 Marker# (2 bytes)
685
05 ASCII length of string null terminated string
686
06 Repeat 2 Count# (2 bytes)
687
07 End repeat 0 (NONE)
691
---------------------
696
**Silence Info Format:
697
----------------------------
698
00-01 Length of silence - 1
702
***Extended Info Format:
703
---------------------
704
00-01 Time Constant: Mono: 65536 - (256000000/sample_rate)
705
Stereo: 65536 - (25600000/(2*sample_rate))
711
Marker# -- Driver keeps the most recent marker in a status byte
712
Count# -- Number of repetitions + 1
713
Count# may be 1 to FFFE for 0 - FFFD repetitions
714
or FFFF for endless repetitions
715
Sample Rate -- SR byte = 256-(1000000/sample_rate)
716
Length of silence -- in units of sampling cycle
717
Compression Type -- of voice data
722
Multi DAC = 3+(# of channels) [interesting--
723
this isn't in the developer's manual]
726
---------------------------------------------------------------------------------
727
Addendum submitted by Votis Kokavessis:
729
After some experimenting with .VOC files I found out that there is a Data Block
730
Type 9, which is not covered in the VOC.TXT file. Here is what I was able to discover
731
about this block type:
735
SIZE: 12 + length of data
736
INFO: 12 (twelve) bytes
740
Bytes 0-1: (Word) Sample Rate (e.g. 44100)
741
Bytes 2-3: zero (could be that bytes 0-3 are a DWord for Sample Rate)
742
Byte 4: Sample Size in bits (e.g. 16)
743
Byte 5: Number of channels (e.g. 1 for mono, 2 for stereo)
744
Byte 6: Unknown (equal to 4 in all files I examined)
748
-------------------------------------------------------------------------------------*/
750
/*=====================================================================================
751
**=====================================================================================
752
**=====================================================================================
753
**=====================================================================================
756
/*------------------------------------------------------------------------
757
The following is taken from the Audio File Formats FAQ dated 2-Jan-1995
758
and submitted by Guido van Rossum <guido@cwi.nl>.
759
--------------------------------------------------------------------------
760
Creative Voice (VOC) file format
761
--------------------------------
763
From: galt@dsd.es.com
765
(byte numbers are hex!)
768
Series of DATA BLOCKS (bytes 1A+) [Must end w/ Terminator Block]
770
- ---------------------------------------------------------------
775
------ ------------------------------------------
776
00-12 "Creative Voice File"
777
13 1A (eof to abort printing of file)
778
14-15 Offset of first datablock in .voc file (std 1A 00
780
16-17 Version number (minor,major) (VOC-HDR puts 0A 01)
781
18-19 2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11)
783
- ---------------------------------------------------------------
788
Data Block: TYPE(1-byte), SIZE(3-bytes), INFO(0+ bytes)
789
NOTE: Terminator Block is an exception -- it has only the TYPE byte.
791
TYPE Description Size (3-byte int) Info
792
---- ----------- ----------------- -----------------------
793
00 Terminator (NONE) (NONE)
794
01 Sound data 2+length of data *
795
02 Sound continue length of data Voice Data
797
04 Marker 2 Marker# (2 bytes)
798
05 ASCII length of string null terminated string
799
06 Repeat 2 Count# (2 bytes)
800
07 End repeat 0 (NONE)
803
*Sound Info Format: **Silence Info Format:
804
--------------------- ----------------------------
805
00 Sample Rate 00-01 Length of silence - 1
806
01 Compression Type 02 Sample Rate
809
***Extended Info Format:
810
---------------------
811
00-01 Time Constant: Mono: 65536 - (256000000/sample_rate)
812
Stereo: 65536 - (25600000/(2*sample_rate))
818
Marker# -- Driver keeps the most recent marker in a status byte
819
Count# -- Number of repetitions + 1
820
Count# may be 1 to FFFE for 0 - FFFD repetitions
821
or FFFF for endless repetitions
822
Sample Rate -- SR byte = 256-(1000000/sample_rate)
823
Length of silence -- in units of sampling cycle
824
Compression Type -- of voice data
829
Multi DAC = 3+(# of channels) [interesting--
830
this isn't in the developer's manual]
832
Detailed description of new data blocks (VOC files version 1.20 and above):
834
(Source is fax from Barry Boone at Creative Labs, 405/742-6622)
836
BLOCK 8 - digitized sound attribute extension, must preceed block 1.
837
Used to define stereo, 8 bit audio
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BYTE bBlockID; // = 8
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BYTE nBlockLen[3]; // 3 byte length
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WORD wTimeConstant; // time constant = same as block 1
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BYTE bPackMethod; // same as in block 1
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BYTE bVoiceMode; // 0-mono, 1-stereo
844
Data is stored left, right
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BLOCK 9 - data block that supersedes blocks 1 and 8.
847
Used for stereo, 16 bit.
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BYTE bBlockID; // = 9
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BYTE nBlockLen[3]; // length 12 plus length of sound
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DWORD dwSamplesPerSec; // samples per second, not time const.
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BYTE bBitsPerSample; // e.g., 8 or 16
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BYTE bChannels; // 1 for mono, 2 for stereo
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WORD wFormat; // see below
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BYTE reserved[4]; // pad to make block w/o data
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// have a size of 16 bytes
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Valid values of wFormat are:
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0x0000 8-bit unsigned PCM
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0x0001 Creative 8-bit to 4-bit ADPCM
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0x0002 Creative 8-bit to 3-bit ADPCM
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0x0003 Creative 8-bit to 2-bit ADPCM
864
0x0004 16-bit signed PCM
867
0x02000 Creative 16-bit to 4-bit ADPCM
869
Data is stored left, right
871
------------------------------------------------------------------------*/
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** Do not edit or modify anything in this comment block.
874
** The arch-tag line is a file identity tag for the GNU Arch
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** revision control system.
877
** arch-tag: 40a50167-a81c-463a-9e1d-3282ff84e09d
added
removed
lib-src/libsndfile/src/voc.c
