mirror of
https://github.com/libretro/RetroArch.git
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75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __RARCH_RESAMPLER_H
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#define __RARCH_RESAMPLER_H
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#ifdef HAVE_CONFIG_H
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#include "../config.h"
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#include <math.h>
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#include "../boolean.h"
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// M_PI is left out of ISO C99 :(
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#ifndef M_PI
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#define M_PI 3.14159265358979323846264338327
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#endif
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struct resampler_data
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{
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const float *data_in;
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float *data_out;
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size_t input_frames;
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size_t output_frames;
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double ratio;
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};
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typedef struct rarch_resampler
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{
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void *(*init)(double bandwidth_mod); // Bandwidth factor. Will be < 1.0 for downsampling, > 1.0 for upsamling. Corresponds to expected resampling ratio.
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void (*process)(void *re, struct resampler_data *data);
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void (*free)(void *re);
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const char *ident;
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} rarch_resampler_t;
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extern const rarch_resampler_t hermite_resampler;
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extern const rarch_resampler_t sinc_resampler;
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// Reallocs resampler. Will free previous handle before allocating a new one.
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// If ident is NULL, first resampler will be used.
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bool rarch_resampler_realloc(void **re, const rarch_resampler_t **backend, const char *ident, double bw_ratio);
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// Convenience macros.
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// freep makes sure to set handles to NULL to avoid double-free in rarch_resampler_realloc.
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#define rarch_resampler_freep(backend, handle) do { \
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if (*(backend) && *(handle)) \
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(*backend)->free(*handle); \
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*backend = NULL; \
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*handle = NULL; \
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} while(0)
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#define rarch_resampler_process(backend, handle, data) do { \
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(backend)->process(handle, data); \
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} while(0)
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#endif
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