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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (panning.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 <math.h>
#include <stdlib.h>
#include <string.h>
#include <libretro_dspfilter.h>
struct panning_data
{
float left[2];
float right[2];
};
static void panning_free(void *data)
{
free(data);
}
static void panning_process(void *data, struct dspfilter_output *output,
const struct dspfilter_input *input)
{
unsigned i;
struct panning_data *pan = (struct panning_data*)data;
float *out = output->samples;
output->samples = input->samples;
output->frames = input->frames;
for (i = 0; i < input->frames; i++, out += 2)
{
float left = out[0];
float right = out[1];
out[0] = left * pan->left[0] + right * pan->left[1];
out[1] = left * pan->right[0] + right * pan->right[1];
}
}
static void *panning_init(const struct dspfilter_info *info,
const struct dspfilter_config *config, void *userdata)
{
static const float default_left[] = { 1.0f, 0.0f };
static const float default_right[] = { 0.0f, 1.0f };
float *left = NULL;
float *right = NULL;
unsigned num_left = 0;
unsigned num_right = 0;
struct panning_data *pan = (struct panning_data*)
calloc(1, sizeof(*pan));
if (!pan)
return NULL;
config->get_float_array(userdata, "left_mix",
&left, &num_left, default_left, 2);
config->get_float_array(userdata, "right_mix",
&right, &num_right, default_right, 2);
memcpy(pan->left, (num_left == 2) ?
left : default_left, sizeof(pan->left));
memcpy(pan->right, (num_right == 2) ?
right : default_right, sizeof(pan->right));
config->free(left);
config->free(right);
return pan;
}
static const struct dspfilter_implementation panning = {
panning_init,
panning_process,
panning_free,
DSPFILTER_API_VERSION,
"Panning",
"panning",
};
#ifdef HAVE_FILTERS_BUILTIN
#define dspfilter_get_implementation panning_dspfilter_get_implementation
#endif
const struct dspfilter_implementation *
dspfilter_get_implementation(dspfilter_simd_mask_t mask)
{
return &panning;
}
#undef dspfilter_get_implementation
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