RetroArch/audio/audio_resampler_driver.c
2016-06-03 06:02:49 +02:00

189 lines
5.0 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2016 - Daniel De Matteis
*
* 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/>.
*/
#include <string.h>
#include <string/stdstring.h>
#include <features/features_cpu.h>
#include "audio_resampler_driver.h"
#include "../config_file_userdata.h"
#ifdef RARCH_INTERNAL
#include "../performance_counters.h"
#endif
#ifndef DONT_HAVE_STRING_LIST
#include "../list_special.h"
#endif
static const rarch_resampler_t *resampler_drivers[] = {
&sinc_resampler,
&CC_resampler,
&nearest_resampler,
&null_resampler,
NULL,
};
static const struct resampler_config resampler_config = {
config_userdata_get_float,
config_userdata_get_int,
config_userdata_get_float_array,
config_userdata_get_int_array,
config_userdata_get_string,
config_userdata_free,
};
/**
* find_resampler_driver_index:
* @ident : Identifier of resampler driver to find.
*
* Finds resampler driver index by @ident name.
*
* Returns: resampler driver index if resampler driver was found, otherwise
* -1.
**/
static int find_resampler_driver_index(const char *ident)
{
unsigned i;
for (i = 0; resampler_drivers[i]; i++)
if (string_is_equal_noncase(ident, resampler_drivers[i]->ident))
return i;
return -1;
}
/**
* audio_resampler_driver_find_handle:
* @idx : index of driver to get handle to.
*
* Returns: handle to audio resampler driver at index. Can be NULL
* if nothing found.
**/
const void *audio_resampler_driver_find_handle(int idx)
{
const void *drv = resampler_drivers[idx];
if (!drv)
return NULL;
return drv;
}
/**
* audio_resampler_driver_find_ident:
* @idx : index of driver to get handle to.
*
* Returns: Human-readable identifier of audio resampler driver at index.
* Can be NULL if nothing found.
**/
const char *audio_resampler_driver_find_ident(int idx)
{
const rarch_resampler_t *drv = resampler_drivers[idx];
if (!drv)
return NULL;
return drv->ident;
}
#ifndef DONT_HAVE_STRING_LIST
/**
* config_get_audio_resampler_driver_options:
*
* Get an enumerated list of all resampler driver names, separated by '|'.
*
* Returns: string listing of all resampler driver names, separated by '|'.
**/
const char* config_get_audio_resampler_driver_options(void)
{
return char_list_new_special(STRING_LIST_AUDIO_RESAMPLER_DRIVERS, NULL);
}
#endif
/**
* find_resampler_driver:
* @ident : Identifier of resampler driver to find.
*
* Finds resampler by @ident name.
*
* Returns: resampler driver if resampler driver was found, otherwise
* NULL.
**/
static const rarch_resampler_t *find_resampler_driver(const char *ident)
{
int i = find_resampler_driver_index(ident);
if (i >= 0)
return resampler_drivers[i];
return resampler_drivers[0];
}
static resampler_simd_mask_t resampler_get_cpu_features(void)
{
return cpu_features_get();
}
/**
* resampler_append_plugs:
* @re : Resampler handle
* @backend : Resampler backend that is about to be set.
* @bw_ratio : Bandwidth ratio.
*
* Initializes resampler driver based on queried CPU features.
*
* Returns: true (1) if successfully initialized, otherwise false (0).
**/
static bool resampler_append_plugs(void **re,
const rarch_resampler_t **backend,
double bw_ratio)
{
resampler_simd_mask_t mask = resampler_get_cpu_features();
*re = (*backend)->init(&resampler_config, bw_ratio, mask);
if (!*re)
return false;
return true;
}
/**
* rarch_resampler_realloc:
* @re : Resampler handle
* @backend : Resampler backend that is about to be set.
* @ident : Identifier name for resampler we want.
* @bw_ratio : Bandwidth ratio.
*
* Reallocates resampler. Will free previous handle before
* allocating a new one. If ident is NULL, first resampler will be used.
*
* Returns: true (1) if successful, otherwise false (0).
**/
bool rarch_resampler_realloc(void **re, const rarch_resampler_t **backend,
const char *ident, double bw_ratio)
{
if (*re && *backend)
(*backend)->free(*re);
*re = NULL;
*backend = find_resampler_driver(ident);
if (!resampler_append_plugs(re, backend, bw_ratio))
goto error;
return true;
error:
if (!*re)
*backend = NULL;
return false;
}