mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-28 02:30:35 +00:00
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/* RetroArch - A frontend for libretro.
|
|
* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
|
|
*
|
|
* RetroArch is free software: you can redistribute it and/or modify it under the terms
|
|
* of the GNU General Public License as published by the Free Software Found-
|
|
* ation, either version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
|
|
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
* PURPOSE. See the GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with RetroArch.
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
|
|
#ifndef __RARCH_RESAMPLER_H
|
|
#define __RARCH_RESAMPLER_H
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "../config.h"
|
|
#endif
|
|
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <math.h>
|
|
#include "../boolean.h"
|
|
|
|
// M_PI is left out of ISO C99 :(
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265358979323846264338327
|
|
#endif
|
|
|
|
struct resampler_data
|
|
{
|
|
const float *data_in;
|
|
float *data_out;
|
|
|
|
size_t input_frames;
|
|
size_t output_frames;
|
|
|
|
double ratio;
|
|
};
|
|
|
|
typedef struct rarch_resampler
|
|
{
|
|
void *(*init)(double bandwidth_mod); // Bandwidth factor. Will be < 1.0 for downsampling, > 1.0 for upsamling. Corresponds to expected resampling ratio.
|
|
void (*process)(void *re, struct resampler_data *data);
|
|
void (*free)(void *re);
|
|
const char *ident;
|
|
} rarch_resampler_t;
|
|
|
|
extern const rarch_resampler_t sinc_resampler;
|
|
|
|
// Reallocs resampler. Will free previous handle before allocating a new one.
|
|
// If ident is NULL, first resampler will be used.
|
|
bool rarch_resampler_realloc(void **re, const rarch_resampler_t **backend, const char *ident, double bw_ratio);
|
|
|
|
// Convenience macros.
|
|
// freep makes sure to set handles to NULL to avoid double-free in rarch_resampler_realloc.
|
|
#define rarch_resampler_freep(backend, handle) do { \
|
|
if (*(backend) && *(handle)) \
|
|
(*backend)->free(*handle); \
|
|
*backend = NULL; \
|
|
*handle = NULL; \
|
|
} while(0)
|
|
|
|
#ifdef RARCH_CONSOLE
|
|
#define rarch_resampler_process(backend, handle, data) resampler_sinc_process(handle, data)
|
|
#else
|
|
#define rarch_resampler_process(backend, handle, data) do { \
|
|
(backend)->process(handle, data); \
|
|
} while(0)
|
|
#endif
|
|
|
|
#endif
|
|
|