mirror of
https://github.com/libretro/libretro-common.git
synced 2024-06-22 22:22:39 -04:00
112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/* Copyright (C) 2010-2020 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (panning.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 <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libretro_dspfilter.h>
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struct panning_data
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{
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float left[2];
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float right[2];
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};
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static void panning_free(void *data)
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{
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free(data);
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}
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static void panning_process(void *data, struct dspfilter_output *output,
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const struct dspfilter_input *input)
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{
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unsigned i;
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struct panning_data *pan = (struct panning_data*)data;
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float *out = output->samples;
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output->samples = input->samples;
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output->frames = input->frames;
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for (i = 0; i < input->frames; i++, out += 2)
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{
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float left = out[0];
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float right = out[1];
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out[0] = left * pan->left[0] + right * pan->left[1];
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out[1] = left * pan->right[0] + right * pan->right[1];
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}
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}
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static void *panning_init(const struct dspfilter_info *info,
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const struct dspfilter_config *config, void *userdata)
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{
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static const float default_left[] = { 1.0f, 0.0f };
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static const float default_right[] = { 0.0f, 1.0f };
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float *left = NULL;
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float *right = NULL;
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unsigned num_left = 0;
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unsigned num_right = 0;
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struct panning_data *pan = (struct panning_data*)
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calloc(1, sizeof(*pan));
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if (!pan)
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return NULL;
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config->get_float_array(userdata, "left_mix",
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&left, &num_left, default_left, 2);
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config->get_float_array(userdata, "right_mix",
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&right, &num_right, default_right, 2);
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memcpy(pan->left, (num_left == 2) ?
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left : default_left, sizeof(pan->left));
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memcpy(pan->right, (num_right == 2) ?
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right : default_right, sizeof(pan->right));
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config->free(left);
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config->free(right);
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return pan;
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}
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static const struct dspfilter_implementation panning = {
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panning_init,
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panning_process,
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panning_free,
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DSPFILTER_API_VERSION,
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"Panning",
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"panning",
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};
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#ifdef HAVE_FILTERS_BUILTIN
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#define dspfilter_get_implementation panning_dspfilter_get_implementation
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#endif
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const struct dspfilter_implementation *
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dspfilter_get_implementation(dspfilter_simd_mask_t mask)
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{
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(void)mask;
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return &panning;
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}
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#undef dspfilter_get_implementation
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