mirror of
https://github.com/libretro/RetroArch.git
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106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - 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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#include "dspfilter.h"
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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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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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output->samples = input->samples;
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output->frames = input->frames;
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float *out = output->samples;
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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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struct panning_data *pan = (struct panning_data*)calloc(1, sizeof(*pan));
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if (!pan)
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return NULL;
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float *left = NULL, *right = NULL;
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unsigned num_left = 0, num_right = 0;
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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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config->get_float_array(userdata, "left_mix", &left, &num_left, default_left, 2);
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config->get_float_array(userdata, "right_mix", &right, &num_right, default_right, 2);
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if (num_left == 2)
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memcpy(pan->left, left, sizeof(pan->left));
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else
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memcpy(pan->left, default_left, sizeof(pan->left));
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if (num_right == 2)
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memcpy(pan->right, right, sizeof(pan->right));
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else
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memcpy(pan->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 *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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