459 lines
14 KiB
C
459 lines
14 KiB
C
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/*
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SDL_mixer: An audio mixer library based on the SDL library
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Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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This is the source needed to decode a Creative Labs VOC file into a
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waveform. It's pretty straightforward once you get going. The only
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externally-callable function is Mix_LoadVOC_RW(), which is meant to
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act as identically to SDL_LoadWAV_RW() as possible.
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This file by Ryan C. Gordon (icculus@icculus.org).
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Heavily borrowed from sox v12.17.1's voc.c.
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(http://www.freshmeat.net/projects/sox/)
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*/
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/* $Id$ */
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#include "SDL_mutex.h"
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#include "SDL_endian.h"
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#include "SDL_timer.h"
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#include "SDL_mixer.h"
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#include "load_voc.h"
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/* Private data for VOC file */
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typedef struct vocstuff {
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Uint32 rest; /* bytes remaining in current block */
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Uint32 rate; /* rate code (byte) of this chunk */
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int silent; /* sound or silence? */
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Uint32 srate; /* rate code (byte) of silence */
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Uint32 blockseek; /* start of current output block */
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Uint32 samples; /* number of samples output */
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Uint32 size; /* word length of data */
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Uint8 channels; /* number of sound channels */
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int has_extended; /* Has an extended block been read? */
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} vs_t;
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/* Size field */
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/* SJB: note that the 1st 3 are sometimes used as sizeof(type) */
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#define ST_SIZE_BYTE 1
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#define ST_SIZE_8BIT 1
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#define ST_SIZE_WORD 2
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#define ST_SIZE_16BIT 2
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#define ST_SIZE_DWORD 4
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#define ST_SIZE_32BIT 4
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#define ST_SIZE_FLOAT 5
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#define ST_SIZE_DOUBLE 6
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#define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */
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/* Style field */
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#define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */
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#define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */
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#define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */
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#define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */
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#define ST_ENCODING_ADPCM 5 /* Compressed PCM */
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#define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */
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#define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */
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#define VOC_TERM 0
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#define VOC_DATA 1
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#define VOC_CONT 2
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#define VOC_SILENCE 3
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#define VOC_MARKER 4
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#define VOC_TEXT 5
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#define VOC_LOOP 6
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#define VOC_LOOPEND 7
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#define VOC_EXTENDED 8
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#define VOC_DATA_16 9
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static int voc_check_header(SDL_RWops *src)
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{
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/* VOC magic header */
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Uint8 signature[20]; /* "Creative Voice File\032" */
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Uint16 datablockofs;
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SDL_RWseek(src, 0, RW_SEEK_SET);
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if (SDL_RWread(src, signature, sizeof (signature), 1) != 1)
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return(0);
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if (memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) {
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SDL_SetError("Unrecognized file type (not VOC)");
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return(0);
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}
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/* get the offset where the first datablock is located */
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if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1)
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return(0);
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datablockofs = SDL_SwapLE16(datablockofs);
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if (SDL_RWseek(src, datablockofs, RW_SEEK_SET) != datablockofs)
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return(0);
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return(1); /* success! */
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} /* voc_check_header */
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/* Read next block header, save info, leave position at start of data */
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static int voc_get_block(SDL_RWops *src, vs_t *v, SDL_AudioSpec *spec)
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{
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Uint8 bits24[3];
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Uint8 uc, block;
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Uint32 sblen;
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Uint16 new_rate_short;
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Uint32 new_rate_long;
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Uint8 trash[6];
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Uint16 period;
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unsigned int i;
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v->silent = 0;
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while (v->rest == 0)
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{
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if (SDL_RWread(src, &block, sizeof (block), 1) != 1)
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return 1; /* assume that's the end of the file. */
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if (block == VOC_TERM)
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return 1;
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if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1)
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return 1; /* assume that's the end of the file. */
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/* Size is an 24-bit value. Ugh. */
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sblen = ( (bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16) );
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switch(block)
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{
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case VOC_DATA:
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if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
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return 0;
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/* When DATA block preceeded by an EXTENDED */
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/* block, the DATA blocks rate value is invalid */
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if (!v->has_extended)
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{
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if (uc == 0)
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{
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SDL_SetError("VOC Sample rate is zero?");
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return 0;
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}
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if ((v->rate != -1) && (uc != v->rate))
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{
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SDL_SetError("VOC sample rate codes differ");
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return 0;
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}
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v->rate = uc;
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spec->freq = (Uint16)(1000000.0/(256 - v->rate));
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v->channels = 1;
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}
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if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
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return 0;
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if (uc != 0)
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{
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SDL_SetError("VOC decoder only interprets 8-bit data");
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return 0;
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}
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v->has_extended = 0;
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v->rest = sblen - 2;
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v->size = ST_SIZE_BYTE;
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return 1;
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case VOC_DATA_16:
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if (SDL_RWread(src, &new_rate_long, sizeof (new_rate_long), 1) != 1)
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return 0;
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new_rate_long = SDL_SwapLE32(new_rate_long);
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if (new_rate_long == 0)
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{
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SDL_SetError("VOC Sample rate is zero?");
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return 0;
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}
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if ((v->rate != -1) && (new_rate_long != v->rate))
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{
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SDL_SetError("VOC sample rate codes differ");
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return 0;
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}
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v->rate = new_rate_long;
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spec->freq = new_rate_long;
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if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
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return 0;
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switch (uc)
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{
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case 8: v->size = ST_SIZE_BYTE; break;
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case 16: v->size = ST_SIZE_WORD; break;
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default:
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SDL_SetError("VOC with unknown data size");
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return 0;
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}
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if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1)
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return 0;
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if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6)
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return 0;
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v->rest = sblen - 12;
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return 1;
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case VOC_CONT:
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v->rest = sblen;
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return 1;
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case VOC_SILENCE:
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if (SDL_RWread(src, &period, sizeof (period), 1) != 1)
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return 0;
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period = SDL_SwapLE16(period);
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if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
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return 0;
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if (uc == 0)
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{
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SDL_SetError("VOC silence sample rate is zero");
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return 0;
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}
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/*
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* Some silence-packed files have gratuitously
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* different sample rate codes in silence.
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* Adjust period.
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*/
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if ((v->rate != -1) && (uc != v->rate))
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period = (Uint16)((period * (256 - uc))/(256 - v->rate));
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else
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v->rate = uc;
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v->rest = period;
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v->silent = 1;
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return 1;
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case VOC_LOOP:
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case VOC_LOOPEND:
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for(i = 0; i < sblen; i++) /* skip repeat loops. */
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{
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if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1)
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return 0;
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}
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break;
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case VOC_EXTENDED:
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/* An Extended block is followed by a data block */
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/* Set this byte so we know to use the rate */
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/* value from the extended block and not the */
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/* data block. */
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v->has_extended = 1;
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if (SDL_RWread(src, &new_rate_short, sizeof (new_rate_short), 1) != 1)
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return 0;
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new_rate_short = SDL_SwapLE16(new_rate_short);
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if (new_rate_short == 0)
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{
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SDL_SetError("VOC sample rate is zero");
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return 0;
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}
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if ((v->rate != -1) && (new_rate_short != v->rate))
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{
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SDL_SetError("VOC sample rate codes differ");
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return 0;
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}
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v->rate = new_rate_short;
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if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
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return 0;
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if (uc != 0)
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{
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SDL_SetError("VOC decoder only interprets 8-bit data");
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return 0;
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}
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if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
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return 0;
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if (uc)
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spec->channels = 2; /* Stereo */
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/* Needed number of channels before finishing
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compute for rate */
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spec->freq = (256000000L/(65536L - v->rate))/spec->channels;
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/* An extended block must be followed by a data */
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/* block to be valid so loop back to top so it */
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/* can be grabed. */
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continue;
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case VOC_MARKER:
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if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2)
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return 0;
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/* Falling! Falling! */
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default: /* text block or other krapola. */
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for(i = 0; i < sblen; i++)
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{
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if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1)
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return 0;
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}
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if (block == VOC_TEXT)
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continue; /* get next block */
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}
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}
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return 1;
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}
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static int voc_read(SDL_RWops *src, vs_t *v, Uint8 *buf, SDL_AudioSpec *spec)
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{
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int done = 0;
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Uint8 silence = 0x80;
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if (v->rest == 0)
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{
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if (!voc_get_block(src, v, spec))
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return 0;
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}
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if (v->rest == 0)
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return 0;
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if (v->silent)
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{
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if (v->size == ST_SIZE_WORD)
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silence = 0x00;
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/* Fill in silence */
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memset(buf, silence, v->rest);
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done = v->rest;
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v->rest = 0;
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}
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else
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{
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done = SDL_RWread(src, buf, 1, v->rest);
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v->rest -= done;
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if (v->size == ST_SIZE_WORD)
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{
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#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
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Uint16 *samples = (Uint16 *)buf;
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for (; v->rest > 0; v->rest -= 2)
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{
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*samples = SDL_SwapLE16(*samples);
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samples++;
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}
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#endif
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done >>= 1;
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}
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}
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return done;
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} /* voc_read */
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/* don't call this directly; use Mix_LoadWAV_RW() for now. */
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SDL_AudioSpec *Mix_LoadVOC_RW (SDL_RWops *src, int freesrc,
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SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len)
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{
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vs_t v;
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int was_error = 1;
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int samplesize;
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Uint8 *fillptr;
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void *ptr;
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if ( (!src) || (!audio_buf) || (!audio_len) ) /* sanity checks. */
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goto done;
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|
|
if ( !voc_check_header(src) )
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
v.rate = -1;
|
||
|
|
v.rest = 0;
|
||
|
|
v.has_extended = 0;
|
||
|
|
*audio_buf = NULL;
|
||
|
|
*audio_len = 0;
|
||
|
|
memset(spec, '\0', sizeof (SDL_AudioSpec));
|
||
|
|
|
||
|
|
if (!voc_get_block(src, &v, spec))
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
if (v.rate == -1)
|
||
|
|
{
|
||
|
|
SDL_SetError("VOC data had no sound!");
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
spec->format = ((v.size == ST_SIZE_WORD) ? AUDIO_S16 : AUDIO_U8);
|
||
|
|
if (spec->channels == 0)
|
||
|
|
spec->channels = v.channels;
|
||
|
|
|
||
|
|
*audio_len = v.rest;
|
||
|
|
*audio_buf = SDL_malloc(v.rest);
|
||
|
|
if (*audio_buf == NULL)
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
fillptr = *audio_buf;
|
||
|
|
|
||
|
|
while (voc_read(src, &v, fillptr, spec) > 0)
|
||
|
|
{
|
||
|
|
if (!voc_get_block(src, &v, spec))
|
||
|
|
goto done;
|
||
|
|
|
||
|
|
*audio_len += v.rest;
|
||
|
|
ptr = SDL_realloc(*audio_buf, *audio_len);
|
||
|
|
if (ptr == NULL)
|
||
|
|
{
|
||
|
|
SDL_free(*audio_buf);
|
||
|
|
*audio_buf = NULL;
|
||
|
|
*audio_len = 0;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
*audio_buf = ptr;
|
||
|
|
fillptr = ((Uint8 *) ptr) + (*audio_len - v.rest);
|
||
|
|
}
|
||
|
|
|
||
|
|
spec->samples = (Uint16)(*audio_len / v.size);
|
||
|
|
|
||
|
|
was_error = 0; /* success, baby! */
|
||
|
|
|
||
|
|
/* Don't return a buffer that isn't a multiple of samplesize */
|
||
|
|
samplesize = ((spec->format & 0xFF)/8)*spec->channels;
|
||
|
|
*audio_len &= ~(samplesize-1);
|
||
|
|
|
||
|
|
done:
|
||
|
|
if (src)
|
||
|
|
{
|
||
|
|
if (freesrc)
|
||
|
|
SDL_RWclose(src);
|
||
|
|
else
|
||
|
|
SDL_RWseek(src, 0, RW_SEEK_SET);
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( was_error )
|
||
|
|
spec = NULL;
|
||
|
|
|
||
|
|
return(spec);
|
||
|
|
} /* Mix_LoadVOC_RW */
|
||
|
|
|
||
|
|
/* end of load_voc.c ... */
|