Built SDL2_image and _mixer static
This commit is contained in:
451
libsdl2_mixer/load_voc.c
Normal file
451
libsdl2_mixer/load_voc.c
Normal file
@ -0,0 +1,451 @@
|
||||
/*
|
||||
SDL_mixer: An audio mixer library based on the SDL library
|
||||
Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
|
||||
|
||||
This software is provided 'as-is', without any express or implied
|
||||
warranty. In no event will the authors be held liable for any damages
|
||||
arising from the use of this software.
|
||||
|
||||
Permission is granted to anyone to use this software for any purpose,
|
||||
including commercial applications, and to alter it and redistribute it
|
||||
freely, subject to the following restrictions:
|
||||
|
||||
1. The origin of this software must not be misrepresented; you must not
|
||||
claim that you wrote the original software. If you use this software
|
||||
in a product, an acknowledgment in the product documentation would be
|
||||
appreciated but is not required.
|
||||
2. Altered source versions must be plainly marked as such, and must not be
|
||||
misrepresented as being the original software.
|
||||
3. This notice may not be removed or altered from any source distribution.
|
||||
|
||||
This is the source needed to decode a Creative Labs VOC file into a
|
||||
waveform. It's pretty straightforward once you get going. The only
|
||||
externally-callable function is Mix_LoadVOC_RW(), which is meant to
|
||||
act as identically to SDL_LoadWAV_RW() as possible.
|
||||
|
||||
This file by Ryan C. Gordon (icculus@icculus.org).
|
||||
|
||||
Heavily borrowed from sox v12.17.1's voc.c.
|
||||
(http://www.freshmeat.net/projects/sox/)
|
||||
*/
|
||||
|
||||
#include "SDL_mixer.h"
|
||||
#include "load_voc.h"
|
||||
|
||||
/* Private data for VOC file */
|
||||
typedef struct vocstuff {
|
||||
Uint32 rest; /* bytes remaining in current block */
|
||||
Uint32 rate; /* rate code (byte) of this chunk */
|
||||
int silent; /* sound or silence? */
|
||||
Uint32 srate; /* rate code (byte) of silence */
|
||||
Uint32 blockseek; /* start of current output block */
|
||||
Uint32 samples; /* number of samples output */
|
||||
Uint32 size; /* word length of data */
|
||||
Uint8 channels; /* number of sound channels */
|
||||
int has_extended; /* Has an extended block been read? */
|
||||
} vs_t;
|
||||
|
||||
/* Size field */
|
||||
/* SJB: note that the 1st 3 are sometimes used as sizeof(type) */
|
||||
#define ST_SIZE_BYTE 1
|
||||
#define ST_SIZE_8BIT 1
|
||||
#define ST_SIZE_WORD 2
|
||||
#define ST_SIZE_16BIT 2
|
||||
#define ST_SIZE_DWORD 4
|
||||
#define ST_SIZE_32BIT 4
|
||||
#define ST_SIZE_FLOAT 5
|
||||
#define ST_SIZE_DOUBLE 6
|
||||
#define ST_SIZE_IEEE 7 /* IEEE 80-bit floats. */
|
||||
|
||||
/* Style field */
|
||||
#define ST_ENCODING_UNSIGNED 1 /* unsigned linear: Sound Blaster */
|
||||
#define ST_ENCODING_SIGN2 2 /* signed linear 2's comp: Mac */
|
||||
#define ST_ENCODING_ULAW 3 /* U-law signed logs: US telephony, SPARC */
|
||||
#define ST_ENCODING_ALAW 4 /* A-law signed logs: non-US telephony */
|
||||
#define ST_ENCODING_ADPCM 5 /* Compressed PCM */
|
||||
#define ST_ENCODING_IMA_ADPCM 6 /* Compressed PCM */
|
||||
#define ST_ENCODING_GSM 7 /* GSM 6.10 33-byte frame lossy compression */
|
||||
|
||||
#define VOC_TERM 0
|
||||
#define VOC_DATA 1
|
||||
#define VOC_CONT 2
|
||||
#define VOC_SILENCE 3
|
||||
#define VOC_MARKER 4
|
||||
#define VOC_TEXT 5
|
||||
#define VOC_LOOP 6
|
||||
#define VOC_LOOPEND 7
|
||||
#define VOC_EXTENDED 8
|
||||
#define VOC_DATA_16 9
|
||||
|
||||
|
||||
static int voc_check_header(SDL_RWops *src)
|
||||
{
|
||||
/* VOC magic header */
|
||||
Uint8 signature[20]; /* "Creative Voice File\032" */
|
||||
Uint16 datablockofs;
|
||||
|
||||
SDL_RWseek(src, 0, RW_SEEK_SET);
|
||||
|
||||
if (SDL_RWread(src, signature, sizeof (signature), 1) != 1)
|
||||
return(0);
|
||||
|
||||
if (SDL_memcmp(signature, "Creative Voice File\032", sizeof (signature)) != 0) {
|
||||
SDL_SetError("Unrecognized file type (not VOC)");
|
||||
return(0);
|
||||
}
|
||||
|
||||
/* get the offset where the first datablock is located */
|
||||
if (SDL_RWread(src, &datablockofs, sizeof (Uint16), 1) != 1)
|
||||
return(0);
|
||||
|
||||
datablockofs = SDL_SwapLE16(datablockofs);
|
||||
|
||||
if (SDL_RWseek(src, datablockofs, RW_SEEK_SET) != datablockofs)
|
||||
return(0);
|
||||
|
||||
return(1); /* success! */
|
||||
} /* voc_check_header */
|
||||
|
||||
|
||||
/* Read next block header, save info, leave position at start of data */
|
||||
static int voc_get_block(SDL_RWops *src, vs_t *v, SDL_AudioSpec *spec)
|
||||
{
|
||||
Uint8 bits24[3];
|
||||
Uint8 uc, block;
|
||||
Uint32 sblen;
|
||||
Uint16 new_rate_short;
|
||||
Uint32 new_rate_long;
|
||||
Uint8 trash[6];
|
||||
Uint16 period;
|
||||
unsigned int i;
|
||||
|
||||
v->silent = 0;
|
||||
while (v->rest == 0)
|
||||
{
|
||||
if (SDL_RWread(src, &block, sizeof (block), 1) != 1)
|
||||
return 1; /* assume that's the end of the file. */
|
||||
|
||||
if (block == VOC_TERM)
|
||||
return 1;
|
||||
|
||||
if (SDL_RWread(src, bits24, sizeof (bits24), 1) != 1)
|
||||
return 1; /* assume that's the end of the file. */
|
||||
|
||||
/* Size is an 24-bit value. Ugh. */
|
||||
sblen = ((bits24[0]) | (bits24[1] << 8) | (bits24[2] << 16));
|
||||
|
||||
switch(block)
|
||||
{
|
||||
case VOC_DATA:
|
||||
if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
|
||||
return 0;
|
||||
|
||||
/* When DATA block preceeded by an EXTENDED */
|
||||
/* block, the DATA blocks rate value is invalid */
|
||||
if (!v->has_extended)
|
||||
{
|
||||
if (uc == 0)
|
||||
{
|
||||
SDL_SetError("VOC Sample rate is zero?");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if ((v->rate != -1) && (uc != v->rate))
|
||||
{
|
||||
SDL_SetError("VOC sample rate codes differ");
|
||||
return 0;
|
||||
}
|
||||
|
||||
v->rate = uc;
|
||||
spec->freq = (Uint16)(1000000.0/(256 - v->rate));
|
||||
v->channels = 1;
|
||||
}
|
||||
|
||||
if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
|
||||
return 0;
|
||||
|
||||
if (uc != 0)
|
||||
{
|
||||
SDL_SetError("VOC decoder only interprets 8-bit data");
|
||||
return 0;
|
||||
}
|
||||
|
||||
v->has_extended = 0;
|
||||
v->rest = sblen - 2;
|
||||
v->size = ST_SIZE_BYTE;
|
||||
return 1;
|
||||
|
||||
case VOC_DATA_16:
|
||||
if (SDL_RWread(src, &new_rate_long, sizeof (new_rate_long), 1) != 1)
|
||||
return 0;
|
||||
new_rate_long = SDL_SwapLE32(new_rate_long);
|
||||
if (new_rate_long == 0)
|
||||
{
|
||||
SDL_SetError("VOC Sample rate is zero?");
|
||||
return 0;
|
||||
}
|
||||
if ((v->rate != -1) && (new_rate_long != v->rate))
|
||||
{
|
||||
SDL_SetError("VOC sample rate codes differ");
|
||||
return 0;
|
||||
}
|
||||
v->rate = new_rate_long;
|
||||
spec->freq = new_rate_long;
|
||||
|
||||
if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
|
||||
return 0;
|
||||
|
||||
switch (uc)
|
||||
{
|
||||
case 8: v->size = ST_SIZE_BYTE; break;
|
||||
case 16: v->size = ST_SIZE_WORD; break;
|
||||
default:
|
||||
SDL_SetError("VOC with unknown data size");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (SDL_RWread(src, &v->channels, sizeof (Uint8), 1) != 1)
|
||||
return 0;
|
||||
|
||||
if (SDL_RWread(src, trash, sizeof (Uint8), 6) != 6)
|
||||
return 0;
|
||||
|
||||
v->rest = sblen - 12;
|
||||
return 1;
|
||||
|
||||
case VOC_CONT:
|
||||
v->rest = sblen;
|
||||
return 1;
|
||||
|
||||
case VOC_SILENCE:
|
||||
if (SDL_RWread(src, &period, sizeof (period), 1) != 1)
|
||||
return 0;
|
||||
period = SDL_SwapLE16(period);
|
||||
|
||||
if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
|
||||
return 0;
|
||||
if (uc == 0)
|
||||
{
|
||||
SDL_SetError("VOC silence sample rate is zero");
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Some silence-packed files have gratuitously
|
||||
* different sample rate codes in silence.
|
||||
* Adjust period.
|
||||
*/
|
||||
if ((v->rate != -1) && (uc != v->rate))
|
||||
period = (Uint16)((period * (256 - uc))/(256 - v->rate));
|
||||
else
|
||||
v->rate = uc;
|
||||
v->rest = period;
|
||||
v->silent = 1;
|
||||
return 1;
|
||||
|
||||
case VOC_LOOP:
|
||||
case VOC_LOOPEND:
|
||||
for(i = 0; i < sblen; i++) /* skip repeat loops. */
|
||||
{
|
||||
if (SDL_RWread(src, trash, sizeof (Uint8), 1) != 1)
|
||||
return 0;
|
||||
}
|
||||
break;
|
||||
|
||||
case VOC_EXTENDED:
|
||||
/* An Extended block is followed by a data block */
|
||||
/* Set this byte so we know to use the rate */
|
||||
/* value from the extended block and not the */
|
||||
/* data block. */
|
||||
v->has_extended = 1;
|
||||
if (SDL_RWread(src, &new_rate_short, sizeof (new_rate_short), 1) != 1)
|
||||
return 0;
|
||||
new_rate_short = SDL_SwapLE16(new_rate_short);
|
||||
if (new_rate_short == 0)
|
||||
{
|
||||
SDL_SetError("VOC sample rate is zero");
|
||||
return 0;
|
||||
}
|
||||
if ((v->rate != -1) && (new_rate_short != v->rate))
|
||||
{
|
||||
SDL_SetError("VOC sample rate codes differ");
|
||||
return 0;
|
||||
}
|
||||
v->rate = new_rate_short;
|
||||
|
||||
if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
|
||||
return 0;
|
||||
|
||||
if (uc != 0)
|
||||
{
|
||||
SDL_SetError("VOC decoder only interprets 8-bit data");
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (SDL_RWread(src, &uc, sizeof (uc), 1) != 1)
|
||||
return 0;
|
||||
|
||||
if (uc)
|
||||
spec->channels = 2; /* Stereo */
|
||||
/* Needed number of channels before finishing
|
||||
compute for rate */
|
||||
spec->freq = (256000000L/(65536L - v->rate))/spec->channels;
|
||||
/* An extended block must be followed by a data */
|
||||
/* block to be valid so loop back to top so it */
|
||||
/* can be grabed. */
|
||||
continue;
|
||||
|
||||
case VOC_MARKER:
|
||||
if (SDL_RWread(src, trash, sizeof (Uint8), 2) != 2)
|
||||
return 0;
|
||||
|
||||
/* Falling! Falling! */
|
||||
|
||||
default: /* text block or other krapola. */
|
||||
for(i = 0; i < sblen; i++)
|
||||
{
|
||||
if (SDL_RWread(src, &trash, sizeof (Uint8), 1) != 1)
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (block == VOC_TEXT)
|
||||
continue; /* get next block */
|
||||
}
|
||||
}
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
static int voc_read(SDL_RWops *src, vs_t *v, Uint8 *buf, SDL_AudioSpec *spec)
|
||||
{
|
||||
Uint32 done = 0;
|
||||
Uint8 silence = 0x80;
|
||||
|
||||
if (v->rest == 0)
|
||||
{
|
||||
if (!voc_get_block(src, v, spec))
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (v->rest == 0)
|
||||
return 0;
|
||||
|
||||
if (v->silent)
|
||||
{
|
||||
if (v->size == ST_SIZE_WORD)
|
||||
silence = 0x00;
|
||||
|
||||
/* Fill in silence */
|
||||
SDL_memset(buf, silence, v->rest);
|
||||
done = v->rest;
|
||||
v->rest = 0;
|
||||
}
|
||||
|
||||
else
|
||||
{
|
||||
done = (Uint32)SDL_RWread(src, buf, 1, v->rest);
|
||||
v->rest -= done;
|
||||
if (v->size == ST_SIZE_WORD)
|
||||
{
|
||||
#if (SDL_BYTEORDER == SDL_BIG_ENDIAN)
|
||||
Uint16 *samples = (Uint16 *)buf;
|
||||
for (; v->rest > 0; v->rest -= 2)
|
||||
{
|
||||
*samples = SDL_SwapLE16(*samples);
|
||||
samples++;
|
||||
}
|
||||
#endif
|
||||
done >>= 1;
|
||||
}
|
||||
}
|
||||
|
||||
return done;
|
||||
} /* voc_read */
|
||||
|
||||
|
||||
/* don't call this directly; use Mix_LoadWAV_RW() for now. */
|
||||
SDL_AudioSpec *Mix_LoadVOC_RW (SDL_RWops *src, int freesrc,
|
||||
SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len)
|
||||
{
|
||||
vs_t v;
|
||||
int was_error = 1;
|
||||
int samplesize;
|
||||
Uint8 *fillptr;
|
||||
void *ptr;
|
||||
|
||||
if ((!src) || (!audio_buf) || (!audio_len)) /* sanity checks. */
|
||||
goto done;
|
||||
|
||||
if (!voc_check_header(src))
|
||||
goto done;
|
||||
|
||||
v.rate = -1;
|
||||
v.rest = 0;
|
||||
v.has_extended = 0;
|
||||
*audio_buf = NULL;
|
||||
*audio_len = 0;
|
||||
SDL_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 (freesrc && src) {
|
||||
SDL_RWclose(src);
|
||||
}
|
||||
|
||||
if (was_error) {
|
||||
spec = NULL;
|
||||
}
|
||||
|
||||
return(spec);
|
||||
} /* Mix_LoadVOC_RW */
|
||||
|
||||
/* end of load_voc.c ... */
|
||||
|
||||
/* vi: set ts=4 sw=4 expandtab: */
|
||||
Reference in New Issue
Block a user