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https://github.com/ekeeke/Genesis-Plus-GX.git
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89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/* Copyright (C) 2010-2017 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (nearest_resampler.c).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <math.h>
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#include <audio/audio_resampler.h>
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typedef struct rarch_nearest_resampler
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{
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float fraction;
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} rarch_nearest_resampler_t;
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static void resampler_nearest_process(
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void *re_, struct resampler_data *data)
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{
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rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)re_;
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audio_frame_float_t *inp = (audio_frame_float_t*)data->data_in;
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audio_frame_float_t *inp_max = (audio_frame_float_t*)inp + data->input_frames;
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audio_frame_float_t *outp = (audio_frame_float_t*)data->data_out;
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float ratio = 1.0 / data->ratio;
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while(inp != inp_max)
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{
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while(re->fraction > 1)
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{
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*outp++ = *inp;
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re->fraction -= ratio;
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}
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re->fraction++;
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inp++;
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}
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data->output_frames = (outp - (audio_frame_float_t*)data->data_out);
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}
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static void resampler_nearest_free(void *re_)
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{
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rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)re_;
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if (re)
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free(re);
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}
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static void *resampler_nearest_init(const struct resampler_config *config,
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double bandwidth_mod, resampler_simd_mask_t mask)
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{
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rarch_nearest_resampler_t *re = (rarch_nearest_resampler_t*)
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calloc(1, sizeof(rarch_nearest_resampler_t));
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(void)config;
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(void)mask;
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if (!re)
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return NULL;
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re->fraction = 0;
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return re;
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}
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retro_resampler_t nearest_resampler = {
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resampler_nearest_init,
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resampler_nearest_process,
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resampler_nearest_free,
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RESAMPLER_API_VERSION,
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"nearest",
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"nearest"
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};
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