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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (nearest_resampler.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 <stdint.h>
#include <stdlib.h>
#include <math.h>
#include <audio/audio_resampler.h>
typedef struct rarch_nearest_resampler
{
float fraction;
} rarch_nearest_resampler_t;
static void resampler_nearest_process(
void *re_, struct resampler_data *data)
{
rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)re_;
audio_frame_float_t *inp = (audio_frame_float_t*)data->data_in;
audio_frame_float_t *inp_max = (audio_frame_float_t*)inp + data->input_frames;
audio_frame_float_t *outp = (audio_frame_float_t*)data->data_out;
float ratio = 1.0 / data->ratio;
while (inp != inp_max)
{
while (re->fraction > 1)
{
*outp++ = *inp;
re->fraction -= ratio;
}
re->fraction++;
inp++;
}
data->output_frames = (outp - (audio_frame_float_t*)data->data_out);
}
static void resampler_nearest_free(void *re_)
{
rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)re_;
if (re)
free(re);
}
static void *resampler_nearest_init(const struct resampler_config *config,
double bandwidth_mod,
enum resampler_quality quality,
resampler_simd_mask_t mask)
{
rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)
calloc(1, sizeof(rarch_nearest_resampler_t));
if (!re)
return NULL;
re->fraction = 0;
return re;
}
retro_resampler_t nearest_resampler = {
resampler_nearest_init,
resampler_nearest_process,
resampler_nearest_free,
RESAMPLER_API_VERSION,
"nearest",
"nearest"
};
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