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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (rwav.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdarg.h>
#include <stddef.h> /* ptrdiff_t on osx */
#include <stdlib.h>
#include <string.h>
#include <formats/rwav.h>
enum
{
ITER_BEGIN,
ITER_COPY_SAMPLES,
ITER_COPY_SAMPLES_8,
ITER_COPY_SAMPLES_16
};
struct rwav_iterator
{
rwav_t *out;
const uint8_t *data;
size_t size;
size_t i, j;
int step;
};
void rwav_init(rwav_iterator_t* iter, rwav_t* out, const void* buf, size_t size)
{
iter->out = out;
iter->data = (const uint8_t*)buf;
iter->size = size;
iter->step = ITER_BEGIN;
out->samples = NULL;
}
enum rwav_state rwav_iterate(rwav_iterator_t *iter)
{
size_t s;
uint16_t *u16 = NULL;
void *samples = NULL;
rwav_t *rwav = iter->out;
const uint8_t *data = iter->data;
switch (iter->step)
{
case ITER_BEGIN:
if (iter->size < 44)
return RWAV_ITERATE_ERROR; /* buffer is smaller than an empty wave file */
if (data[0] != 'R' || data[1] != 'I' || data[2] != 'F' || data[3] != 'F')
return RWAV_ITERATE_ERROR;
if (data[8] != 'W' || data[9] != 'A' || data[10] != 'V' || data[11] != 'E')
return RWAV_ITERATE_ERROR;
if (data[12] != 'f' || data[13] != 'm' || data[14] != 't' || data[15] != ' ')
return RWAV_ITERATE_ERROR; /* we don't support non-PCM or compressed data */
if (data[16] != 16 || data[17] != 0 || data[18] != 0 || data[19] != 0)
return RWAV_ITERATE_ERROR;
if (data[20] != 1 || data[21] != 0)
return RWAV_ITERATE_ERROR; /* we don't support non-PCM or compressed data */
if (data[36] != 'd' || data[37] != 'a' || data[38] != 't' || data[39] != 'a')
return RWAV_ITERATE_ERROR;
rwav->bitspersample = data[34] | data[35] << 8;
if (rwav->bitspersample != 8 && rwav->bitspersample != 16)
return RWAV_ITERATE_ERROR; /* we only support 8 and 16 bps */
rwav->subchunk2size = data[40] | data[41] << 8 | data[42] << 16 | data[43] << 24;
if ((rwav->subchunk2size < 1) ||
(rwav->subchunk2size > iter->size - 44))
return RWAV_ITERATE_ERROR; /* too few bytes in buffer */
samples = malloc(rwav->subchunk2size);
if (!samples)
return RWAV_ITERATE_ERROR;
rwav->numchannels = data[22] | data[23] << 8;
rwav->numsamples = rwav->subchunk2size * 8 / rwav->bitspersample / rwav->numchannels;
rwav->samplerate = data[24] | data[25] << 8 | data[26] << 16 | data[27] << 24;
rwav->samples = samples;
iter->step = ITER_COPY_SAMPLES;
return RWAV_ITERATE_MORE;
case ITER_COPY_SAMPLES:
iter->i = 0;
if (rwav->bitspersample == 8)
{
iter->step = ITER_COPY_SAMPLES_8;
/* TODO/FIXME - what is going on here? */
case ITER_COPY_SAMPLES_8:
s = rwav->subchunk2size - iter->i;
if (s > RWAV_ITERATE_BUF_SIZE)
s = RWAV_ITERATE_BUF_SIZE;
memcpy((void*)((uint8_t*)rwav->samples + iter->i), (void *)(iter->data + 44 + iter->i), s);
iter->i += s;
}
else
{
iter->step = ITER_COPY_SAMPLES_16;
iter->j = 0;
/* TODO/FIXME - what is going on here? */
case ITER_COPY_SAMPLES_16:
s = rwav->subchunk2size - iter->i;
if (s > RWAV_ITERATE_BUF_SIZE)
s = RWAV_ITERATE_BUF_SIZE;
u16 = (uint16_t *)rwav->samples;
while (s != 0)
{
u16[iter->j++] = iter->data[44 + iter->i] | iter->data[45 + iter->i] << 8;
iter->i += 2;
s -= 2;
}
}
if (iter->i < rwav->subchunk2size)
return RWAV_ITERATE_MORE;
return RWAV_ITERATE_DONE;
}
return RWAV_ITERATE_ERROR;
}
enum rwav_state rwav_load(rwav_t* out, const void* buf, size_t size)
{
enum rwav_state res;
rwav_iterator_t iter;
iter.out = NULL;
iter.data = NULL;
iter.size = 0;
iter.i = 0;
iter.j = 0;
iter.step = 0;
rwav_init(&iter, out, buf, size);
do
{
res = rwav_iterate(&iter);
}while (res == RWAV_ITERATE_MORE);
return res;
}
void rwav_free(rwav_t *rwav)
{
free((void*)rwav->samples);
}
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