diff options
Diffstat (limited to 'libs/libsndfile/src/voc.c')
| -rw-r--r-- | libs/libsndfile/src/voc.c | 878 |
1 files changed, 0 insertions, 878 deletions
diff --git a/libs/libsndfile/src/voc.c b/libs/libsndfile/src/voc.c deleted file mode 100644 index e1388c4542..0000000000 --- a/libs/libsndfile/src/voc.c +++ /dev/null @@ -1,878 +0,0 @@ -/* -** Copyright (C) 2001-2004 Erik de Castro Lopo <erikd@mega-nerd.com> -** -** This program is free software; you can redistribute it and/or modify -** it under the terms of the GNU Lesser General Public License as published by -** the Free Software Foundation; either version 2.1 of the License, or -** (at your option) any later version. -** -** This program is distributed in the hope that it will be useful, -** but WITHOUT ANY WARRANTY; without even the implied warranty of -** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -** GNU Lesser General Public License for more details. -** -** You should have received a copy of the GNU Lesser General Public License -** along with this program; if not, write to the Free Software -** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. -*/ - -/* RANT: -** The VOC file format is the most brain damaged format I have yet had to deal -** with. No one programmer could have bee stupid enough to put this together. -** Instead it looks like a series of manic, dyslexic assembly language programmers -** hacked it to fit their needs. -** Utterly woeful. -*/ - -#include "sfconfig.h" - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "sndfile.h" -#include "sfendian.h" -#include "common.h" - - -/*------------------------------------------------------------------------------ - * Typedefs for file chunks. -*/ - -#define VOC_MAX_SECTIONS 200 - -enum -{ VOC_TERMINATOR = 0, - VOC_SOUND_DATA = 1, - VOC_SOUND_CONTINUE = 2, - VOC_SILENCE = 3, - VOC_MARKER = 4, - VOC_ASCII = 5, - VOC_REPEAT = 6, - VOC_END_REPEAT = 7, - VOC_EXTENDED = 8, - VOC_EXTENDED_II = 9 -} ; - -typedef struct -{ int samples ; - int offset ; /* Offset of zero => silence. */ -} SND_DATA_BLOCKS ; - -typedef struct -{ unsigned int sections, section_types ; - int samplerate, channels, bitwidth ; - SND_DATA_BLOCKS blocks [VOC_MAX_SECTIONS] ; -} VOC_DATA ; - -/*------------------------------------------------------------------------------ - * Private static functions. -*/ - -static int voc_close (SF_PRIVATE *psf) ; -static int voc_write_header (SF_PRIVATE *psf, int calc_length) ; -static int voc_read_header (SF_PRIVATE *psf) ; - -static const char* voc_encoding2str (int encoding) ; - -#if 0 - -/* These functions would be required for files with more than one VOC_SOUND_DATA -** segment. Not sure whether to bother implementing this. -*/ - -static int voc_multi_init (SF_PRIVATE *psf, VOC_DATA *pvoc) ; - -static int voc_multi_read_uc2s (SF_PRIVATE *psf, short *ptr, int len) ; -static int voc_multi_read_les2s (SF_PRIVATE *psf, short *ptr, int len) ; - -static int voc_multi_read_uc2i (SF_PRIVATE *psf, int *ptr, int len) ; -static int voc_multi_read_les2i (SF_PRIVATE *psf, int *ptr, int len) ; - -static int voc_multi_read_uc2f (SF_PRIVATE *psf, float *ptr, int len) ; -static int voc_multi_read_les2f (SF_PRIVATE *psf, float *ptr, int len) ; - -static int voc_multi_read_uc2d (SF_PRIVATE *psf, double *ptr, int len) ; -static int voc_multi_read_les2d (SF_PRIVATE *psf, double *ptr, int len) ; -#endif - -/*------------------------------------------------------------------------------ -** Public function. -*/ - -int -voc_open (SF_PRIVATE *psf) -{ int subformat, error = 0 ; - - if (psf->is_pipe) - return SFE_VOC_NO_PIPE ; - - if (psf->mode == SFM_READ || (psf->mode == SFM_RDWR && psf->filelength > 0)) - { if ((error = voc_read_header (psf))) - return error ; - } ; - - subformat = psf->sf.format & SF_FORMAT_SUBMASK ; - - if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR) - { if ((psf->sf.format & SF_FORMAT_TYPEMASK) != SF_FORMAT_VOC) - return SFE_BAD_OPEN_FORMAT ; - - psf->endian = SF_ENDIAN_LITTLE ; - - if ((error = voc_write_header (psf, SF_FALSE))) - return error ; - - psf->write_header = voc_write_header ; - } ; - - psf->blockwidth = psf->bytewidth * psf->sf.channels ; - - psf->container_close = voc_close ; - - switch (subformat) - { case SF_FORMAT_PCM_U8 : - case SF_FORMAT_PCM_16 : - error = pcm_init (psf) ; - break ; - - case SF_FORMAT_ALAW : - error = alaw_init (psf) ; - break ; - - case SF_FORMAT_ULAW : - error = ulaw_init (psf) ; - break ; - - default : return SFE_UNIMPLEMENTED ; - } ; - - return error ; -} /* voc_open */ - -/*------------------------------------------------------------------------------ -*/ - -static int -voc_read_header (SF_PRIVATE *psf) -{ VOC_DATA *pvoc ; - char creative [20] ; - unsigned char block_type, rate_byte ; - short version, checksum, encoding, dataoffset ; - int offset ; - - /* Set position to start of file to begin reading header. */ - offset = psf_binheader_readf (psf, "pb", 0, creative, SIGNED_SIZEOF (creative)) ; - - if (creative [sizeof (creative) - 1] != 0x1A) - return SFE_VOC_NO_CREATIVE ; - - /* Terminate the string. */ - creative [sizeof (creative) - 1] = 0 ; - - if (strcmp ("Creative Voice File", creative)) - return SFE_VOC_NO_CREATIVE ; - - psf_log_printf (psf, "%s\n", creative) ; - - offset += psf_binheader_readf (psf, "e222", &dataoffset, &version, &checksum) ; - - psf->dataoffset = dataoffset ; - - psf_log_printf (psf, "dataoffset : %d\n" - "version : 0x%X\n" - "checksum : 0x%X\n", psf->dataoffset, version, checksum) ; - - if (version != 0x010A && version != 0x0114) - return SFE_VOC_BAD_VERSION ; - - if (! (psf->fdata = malloc (sizeof (VOC_DATA)))) - return SFE_MALLOC_FAILED ; - - pvoc = (VOC_DATA*) psf->fdata ; - - memset (pvoc, 0, sizeof (VOC_DATA)) ; - - /* Set the default encoding now. */ - psf->sf.format = SF_FORMAT_VOC ; /* Major format */ - encoding = SF_FORMAT_PCM_U8 ; /* Minor format */ - psf->endian = SF_ENDIAN_LITTLE ; - - while (1) - { offset += psf_binheader_readf (psf, "1", &block_type) ; - - switch (block_type) - { case VOC_ASCII : - { int size ; - - offset += psf_binheader_readf (psf, "e3", &size) ; - - psf_log_printf (psf, " ASCII : %d\n", size) ; - - offset += psf_binheader_readf (psf, "b", psf->header, size) ; - psf->header [size] = 0 ; - psf_log_printf (psf, " text : %s\n", psf->header) ; - } ; - continue ; - - case VOC_SOUND_DATA : - case VOC_EXTENDED : - case VOC_EXTENDED_II : - break ; - - default : psf_log_printf (psf, "*** Weird block marker (%d)\n", block_type) ; - } ; - - break ; - } ; - - if (block_type == VOC_SOUND_DATA) - { unsigned char compression ; - int size ; - - offset += psf_binheader_readf (psf, "e311", &size, &rate_byte, &compression) ; - - psf->sf.samplerate = 1000000 / (256 - (rate_byte & 0xFF)) ; - - psf_log_printf (psf, " Sound Data : %d\n sr : %d => %dHz\n comp : %d\n", - size, rate_byte, psf->sf.samplerate, compression) ; - - if (offset + size - 1 > psf->filelength) - { psf_log_printf (psf, "Seems to be a truncated file.\n") ; - psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ; - return SFE_VOC_BAD_SECTIONS ; - } - else if (offset + size - 1 < psf->filelength) - { psf_log_printf (psf, "Seems to be a multi-segment file (#1).\n") ; - psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ; - return SFE_VOC_BAD_SECTIONS ; - } ; - - psf->dataoffset = offset ; - psf->dataend = psf->filelength - 1 ; - - psf->sf.channels = 1 ; - psf->bytewidth = 1 ; - - psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_U8 ; - - return 0 ; - } ; - - if (block_type == VOC_EXTENDED) - { unsigned char pack, stereo, compression ; - unsigned short rate_short ; - int size ; - - offset += psf_binheader_readf (psf, "e3211", &size, &rate_short, &pack, &stereo) ; - - psf_log_printf (psf, " Extended : %d\n", size) ; - if (size == 4) - psf_log_printf (psf, " size : 4\n") ; - else - psf_log_printf (psf, " size : %d (should be 4)\n", size) ; - - psf_log_printf (psf, " pack : %d\n" - " stereo : %s\n", pack, (stereo ? "yes" : "no")) ; - - if (stereo) - { psf->sf.channels = 2 ; - psf->sf.samplerate = 128000000 / (65536 - rate_short) ; - } - else - { psf->sf.channels = 1 ; - psf->sf.samplerate = 256000000 / (65536 - rate_short) ; - } ; - - psf_log_printf (psf, " sr : %d => %dHz\n", (rate_short & 0xFFFF), psf->sf.samplerate) ; - - offset += psf_binheader_readf (psf, "1", &block_type) ; - - if (block_type != VOC_SOUND_DATA) - { psf_log_printf (psf, "*** Expecting VOC_SOUND_DATA section.\n") ; - return SFE_VOC_BAD_FORMAT ; - } ; - - offset += psf_binheader_readf (psf, "e311", &size, &rate_byte, &compression) ; - - psf_log_printf (psf, " Sound Data : %d\n" - " sr : %d\n" - " comp : %d\n", size, rate_byte, compression) ; - - - if (offset + size - 1 > psf->filelength) - { psf_log_printf (psf, "Seems to be a truncated file.\n") ; - psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ; - return SFE_VOC_BAD_SECTIONS ; - } - else if (offset + size - 1 < psf->filelength) - { psf_log_printf (psf, "Seems to be a multi-segment file (#2).\n") ; - psf_log_printf (psf, "offset: %d size: %d sum: %d filelength: %D\n", offset, size, offset + size, psf->filelength) ; - return SFE_VOC_BAD_SECTIONS ; - } ; - - psf->dataoffset = offset ; - psf->dataend = psf->filelength - 1 ; - - psf->bytewidth = 1 ; - - psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_U8 ; - - return 0 ; - } - - if (block_type == VOC_EXTENDED_II) - { unsigned char bitwidth, channels ; - int size, fourbytes ; - - offset += psf_binheader_readf (psf, "e341124", &size, &psf->sf.samplerate, - &bitwidth, &channels, &encoding, &fourbytes) ; - - if (size * 2 == psf->filelength - 39) - { int temp_size = psf->filelength - 31 ; - - psf_log_printf (psf, " Extended II : %d (SoX bug: should be %d)\n", size, temp_size) ; - size = temp_size ; - } - else - psf_log_printf (psf, " Extended II : %d\n", size) ; - - psf_log_printf (psf, " sample rate : %d\n" - " bit width : %d\n" - " channels : %d\n", psf->sf.samplerate, bitwidth, channels) ; - - if (bitwidth == 16 && encoding == 0) - { encoding = 4 ; - psf_log_printf (psf, " encoding : 0 (SoX bug: should be 4 for 16 bit signed PCM)\n") ; - } - else - psf_log_printf (psf, " encoding : %d => %s\n", encoding, voc_encoding2str (encoding)) ; - - - psf_log_printf (psf, " fourbytes : %X\n", fourbytes) ; - - psf->sf.channels = channels ; - - psf->dataoffset = offset ; - psf->dataend = psf->filelength - 1 ; - - if (size + 31 == psf->filelength + 1) - { /* Hack for reading files produced using - ** sf_command (SFC_UPDATE_HEADER_NOW). - */ - psf_log_printf (psf, "Missing zero byte at end of file.\n") ; - size = psf->filelength - 30 ; - psf->dataend = 0 ; - } - else if (size + 31 > psf->filelength) - { psf_log_printf (psf, "Seems to be a truncated file.\n") ; - size = psf->filelength - 31 ; - } - else if (size + 31 < psf->filelength) - psf_log_printf (psf, "Seems to be a multi-segment file (#3).\n") ; - - switch (encoding) - { case 0 : - psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_U8 ; - psf->bytewidth = 1 ; - break ; - - case 4 : - psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_PCM_16 ; - psf->bytewidth = 2 ; - break ; - - case 6 : - psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_ALAW ; - psf->bytewidth = 1 ; - break ; - - case 7 : - psf->sf.format = SF_FORMAT_VOC | SF_FORMAT_ULAW ; - psf->bytewidth = 1 ; - break ; - - default : /* Unknown */ - return SFE_UNKNOWN_FORMAT ; - break ; - } ; - - } ; - - return 0 ; -} /* voc_read_header */ - -/*==================================================================================== -*/ - -static int -voc_write_header (SF_PRIVATE *psf, int calc_length) -{ sf_count_t current ; - int rate_const, subformat ; - - current = psf_ftell (psf) ; - - if (calc_length) - { psf->filelength = psf_get_filelen (psf) ; - - psf->datalength = psf->filelength - psf->dataoffset ; - if (psf->dataend) - psf->datalength -= psf->filelength - psf->dataend ; - - psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ; - } ; - - subformat = psf->sf.format & SF_FORMAT_SUBMASK ; - /* Reset the current header length to zero. */ - psf->header [0] = 0 ; - psf->headindex = 0 ; - psf_fseek (psf, 0, SEEK_SET) ; - - /* VOC marker and 0x1A byte. */ - psf_binheader_writef (psf, "eb1", "Creative Voice File", 19, 0x1A) ; - - /* Data offset, version and other. */ - psf_binheader_writef (psf, "e222", 26, 0x0114, 0x111F) ; - - /* Use same logic as SOX. - ** If the file is mono 8 bit data, use VOC_SOUND_DATA. - ** If the file is mono 16 bit data, use VOC_EXTENED. - ** Otherwise use VOC_EXTENED_2. - */ - - if (subformat == SF_FORMAT_PCM_U8 && psf->sf.channels == 1) - { /* samplerate = 1000000 / (256 - rate_const) ; */ - rate_const = 256 - 1000000 / psf->sf.samplerate ; - - /* First type marker, length, rate_const and compression */ - psf_binheader_writef (psf, "e1311", VOC_SOUND_DATA, (int) (psf->datalength + 1), rate_const, 0) ; - } - else if (subformat == SF_FORMAT_PCM_U8 && psf->sf.channels == 2) - { /* sample_rate = 128000000 / (65536 - rate_short) ; */ - rate_const = 65536 - 128000000 / psf->sf.samplerate ; - - /* First write the VOC_EXTENDED section - ** marker, length, rate_const and compression - */ - psf_binheader_writef (psf, "e13211", VOC_EXTENDED, 4, rate_const, 0, 1) ; - - /* samplerate = 1000000 / (256 - rate_const) ; */ - rate_const = 256 - 1000000 / psf->sf.samplerate ; - - /* Now write the VOC_SOUND_DATA section - ** marker, length, rate_const and compression - */ - psf_binheader_writef (psf, "e1311", VOC_SOUND_DATA, (int) (psf->datalength + 1), rate_const, 0) ; - } - else - { int length ; - - if (psf->sf.channels < 1 || psf->sf.channels > 2) - return SFE_CHANNEL_COUNT ; - - switch (subformat) - { case SF_FORMAT_PCM_U8 : - psf->bytewidth = 1 ; - length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ; - /* Marker, length, sample rate, bitwidth, stereo flag, encoding and fourt zero bytes. */ - psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 16, psf->sf.channels, 4, 0) ; - break ; - - case SF_FORMAT_PCM_16 : - psf->bytewidth = 2 ; - length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ; - /* Marker, length, sample rate, bitwidth, stereo flag, encoding and fourt zero bytes. */ - psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 16, psf->sf.channels, 4, 0) ; - break ; - - case SF_FORMAT_ALAW : - psf->bytewidth = 1 ; - length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ; - psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 8, psf->sf.channels, 6, 0) ; - break ; - - case SF_FORMAT_ULAW : - psf->bytewidth = 1 ; - length = psf->sf.frames * psf->sf.channels * psf->bytewidth + 12 ; - psf_binheader_writef (psf, "e1341124", VOC_EXTENDED_II, length, psf->sf.samplerate, 8, psf->sf.channels, 7, 0) ; - break ; - - default : return SFE_UNIMPLEMENTED ; - } ; - } ; - - psf_fwrite (psf->header, psf->headindex, 1, psf) ; - - if (psf->error) - return psf->error ; - - psf->dataoffset = psf->headindex ; - - if (current > 0) - psf_fseek (psf, current, SEEK_SET) ; - - return psf->error ; -} /* voc_write_header */ - -static int -voc_close (SF_PRIVATE *psf) -{ - if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR) - { /* Now we know for certain the length of the file we can re-write - ** correct values for the FORM, 8SVX and BODY chunks. - */ - unsigned byte = VOC_TERMINATOR ; - - - psf_fseek (psf, 0, SEEK_END) ; - - /* Write terminator */ - psf_fwrite (&byte, 1, 1, psf) ; - - voc_write_header (psf, SF_TRUE) ; - } ; - - return 0 ; -} /* voc_close */ - -static const char* -voc_encoding2str (int encoding) -{ - switch (encoding) - { case 0 : return "8 bit unsigned PCM" ; - case 4 : return "16 bit signed PCM" ; - case 6 : return "A-law" ; - case 7 : return "u-law" ; - default : break ; - } - return "*** Unknown ***" ; -} /* voc_encoding2str */ - -/*==================================================================================== -*/ - -#if 0 -static int -voc_multi_init (SF_PRIVATE *psf, VOC_DATA *pvoc) -{ - psf->sf.frames = 0 ; - - if (pvoc->bitwidth == 8) - { psf->read_short = voc_multi_read_uc2s ; - psf->read_int = voc_multi_read_uc2i ; - psf->read_float = voc_multi_read_uc2f ; - psf->read_double = voc_multi_read_uc2d ; - return 0 ; - } ; - - if (pvoc->bitwidth == 16) - { psf->read_short = voc_multi_read_les2s ; - psf->read_int = voc_multi_read_les2i ; - psf->read_float = voc_multi_read_les2f ; - psf->read_double = voc_multi_read_les2d ; - return 0 ; - } ; - - psf_log_printf (psf, "Error : bitwith != 8 && bitwidth != 16.\n") ; - - return SFE_UNIMPLEMENTED ; -} /* voc_multi_read_int */ - -/*------------------------------------------------------------------------------------ -*/ - -static int -voc_multi_read_uc2s (SF_PRIVATE *psf, short *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_uc2s */ - -static int -voc_multi_read_les2s (SF_PRIVATE *psf, short *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_les2s */ - - -static int -voc_multi_read_uc2i (SF_PRIVATE *psf, int *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_uc2i */ - -static int -voc_multi_read_les2i (SF_PRIVATE *psf, int *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_les2i */ - - -static int -voc_multi_read_uc2f (SF_PRIVATE *psf, float *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_uc2f */ - -static int -voc_multi_read_les2f (SF_PRIVATE *psf, float *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_les2f */ - - -static int -voc_multi_read_uc2d (SF_PRIVATE *psf, double *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_uc2d */ - -static int -voc_multi_read_les2d (SF_PRIVATE *psf, double *ptr, int len) -{ - - return 0 ; -} /* voc_multi_read_les2d */ - -#endif - -/*------------------------------------------------------------------------------------ - -Creative Voice (VOC) file format --------------------------------- - -~From: galt@dsd.es.com - -(byte numbers are hex!) - - HEADER (bytes 00-19) - Series of DATA BLOCKS (bytes 1A+) [Must end w/ Terminator Block] - -- --------------------------------------------------------------- - -HEADER: -======= - byte # Description - ------ ------------------------------------------ - 00-12 "Creative Voice File" - 13 1A (eof to abort printing of file) - 14-15 Offset of first datablock in .voc file (std 1A 00 - in Intel Notation) - 16-17 Version number (minor,major) (VOC-HDR puts 0A 01) - 18-19 1's Comp of Ver. # + 1234h (VOC-HDR puts 29 11) - -- --------------------------------------------------------------- - -DATA BLOCK: -=========== - - Data Block: TYPE(1-byte), SIZE(3-bytes), INFO(0+ bytes) - NOTE: Terminator Block is an exception -- it has only the TYPE byte. - - TYPE Description Size (3-byte int) Info - ---- ----------- ----------------- ----------------------- - 00 Terminator (NONE) (NONE) - 01 Sound data 2+length of data * - 02 Sound continue length of data Voice Data - 03 Silence 3 ** - 04 Marker 2 Marker# (2 bytes) - 05 ASCII length of string null terminated string - 06 Repeat 2 Count# (2 bytes) - 07 End repeat 0 (NONE) - 08 Extended 4 *** - - *Sound Info Format: - --------------------- - 00 Sample Rate - 01 Compression Type - 02+ Voice Data - - **Silence Info Format: - ---------------------------- - 00-01 Length of silence - 1 - 02 Sample Rate - - - ***Extended Info Format: - --------------------- - 00-01 Time Constant: Mono: 65536 - (256000000/sample_rate) - Stereo: 65536 - (25600000/(2*sample_rate)) - 02 Pack - 03 Mode: 0 = mono - 1 = stereo - - - Marker# -- Driver keeps the most recent marker in a status byte - Count# -- Number of repetitions + 1 - Count# may be 1 to FFFE for 0 - FFFD repetitions - or FFFF for endless repetitions - Sample Rate -- SR byte = 256-(1000000/sample_rate) - Length of silence -- in units of sampling cycle - Compression Type -- of voice data - 8-bits = 0 - 4-bits = 1 - 2.6-bits = 2 - 2-bits = 3 - Multi DAC = 3+(# of channels) [interesting-- - this isn't in the developer's manual] - - ---------------------------------------------------------------------------------- -Addendum submitted by Votis Kokavessis: - -After some experimenting with .VOC files I found out that there is a Data Block -Type 9, which is not covered in the VOC.TXT file. Here is what I was able to discover -about this block type: - - -TYPE: 09 -SIZE: 12 + length of data -INFO: 12 (twelve) bytes - -INFO STRUCTURE: - -Bytes 0-1: (Word) Sample Rate (e.g. 44100) -Bytes 2-3: zero (could be that bytes 0-3 are a DWord for Sample Rate) -Byte 4: Sample Size in bits (e.g. 16) -Byte 5: Number of channels (e.g. 1 for mono, 2 for stereo) -Byte 6: Unknown (equal to 4 in all files I examined) -Bytes 7-11: zero - - --------------------------------------------------------------------------------------*/ - -/*===================================================================================== -**===================================================================================== -**===================================================================================== -**===================================================================================== -*/ - -/*------------------------------------------------------------------------ -The following is taken from the Audio File Formats FAQ dated 2-Jan-1995 -and submitted by Guido van Rossum <guido@cwi.nl>. --------------------------------------------------------------------------- -Creative Voice (VOC) file format --------------------------------- - -From: galt@dsd.es.com - -(byte numbers are hex!) - - HEADER (bytes 00-19) - Series of DATA BLOCKS (bytes 1A+) [Must end w/ Terminator Block] - -- --------------------------------------------------------------- - -HEADER: -------- - byte # Description - ------ ------------------------------------------ - 00-12 "Creative Voice File" - 13 1A (eof to abort printing of file) - 14-15 Offset of first datablock in .voc file (std 1A 00 - in Intel Notation) - 16-17 Version number (minor,major) (VOC-HDR puts 0A 01) - 18-19 2's Comp of Ver. # + 1234h (VOC-HDR puts 29 11) - -- --------------------------------------------------------------- - -DATA BLOCK: ------------ - - Data Block: TYPE(1-byte), SIZE(3-bytes), INFO(0+ bytes) - NOTE: Terminator Block is an exception -- it has only the TYPE byte. - - TYPE Description Size (3-byte int) Info - ---- ----------- ----------------- ----------------------- - 00 Terminator (NONE) (NONE) - 01 Sound data 2+length of data * - 02 Sound continue length of data Voice Data - 03 Silence 3 ** - 04 Marker 2 Marker# (2 bytes) - 05 ASCII length of string null terminated string - 06 Repeat 2 Count# (2 bytes) - 07 End repeat 0 (NONE) - 08 Extended 4 *** - - *Sound Info Format: **Silence Info Format: - --------------------- ---------------------------- - 00 Sample Rate 00-01 Length of silence - 1 - 01 Compression Type 02 Sample Rate - 02+ Voice Data - - ***Extended Info Format: - --------------------- - 00-01 Time Constant: Mono: 65536 - (256000000/sample_rate) - Stereo: 65536 - (25600000/(2*sample_rate)) - 02 Pack - 03 Mode: 0 = mono - 1 = stereo - - - Marker# -- Driver keeps the most recent marker in a status byte - Count# -- Number of repetitions + 1 - Count# may be 1 to FFFE for 0 - FFFD repetitions - or FFFF for endless repetitions - Sample Rate -- SR byte = 256-(1000000/sample_rate) - Length of silence -- in units of sampling cycle - Compression Type -- of voice data - 8-bits = 0 - 4-bits = 1 - 2.6-bits = 2 - 2-bits = 3 - Multi DAC = 3+(# of channels) [interesting-- - this isn't in the developer's manual] - -Detailed description of new data blocks (VOC files version 1.20 and above): - - (Source is fax from Barry Boone at Creative Labs, 405/742-6622) - -BLOCK 8 - digitized sound attribute extension, must preceed block 1. - Used to define stereo, 8 bit audio - BYTE bBlockID; // = 8 - BYTE nBlockLen[3]; // 3 byte length - WORD wTimeConstant; // time constant = same as block 1 - BYTE bPackMethod; // same as in block 1 - BYTE bVoiceMode; // 0-mono, 1-stereo - - Data is stored left, right - -BLOCK 9 - data block that supersedes blocks 1 and 8. - Used for stereo, 16 bit. - - BYTE bBlockID; // = 9 - BYTE nBlockLen[3]; // length 12 plus length of sound - DWORD dwSamplesPerSec; // samples per second, not time const. - BYTE bBitsPerSample; // e.g., 8 or 16 - BYTE bChannels; // 1 for mono, 2 for stereo - WORD wFormat; // see below - BYTE reserved[4]; // pad to make block w/o data - // have a size of 16 bytes - - Valid values of wFormat are: - - 0x0000 8-bit unsigned PCM - 0x0001 Creative 8-bit to 4-bit ADPCM - 0x0002 Creative 8-bit to 3-bit ADPCM - 0x0003 Creative 8-bit to 2-bit ADPCM - 0x0004 16-bit signed PCM - 0x0006 CCITT a-Law - 0x0007 CCITT u-Law - 0x02000 Creative 16-bit to 4-bit ADPCM - - Data is stored left, right - -------------------------------------------------------------------------*/ -/* -** Do not edit or modify anything in this comment block. -** The arch-tag line is a file identity tag for the GNU Arch -** revision control system. -** -** arch-tag: 40a50167-a81c-463a-9e1d-3282ff84e09d -*/ |