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87 lines
2.5 KiB
87 lines
2.5 KiB
/*
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Copyright (c) 2019, Holger Wirtz
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, 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
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THE SOFTWARE.
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*/
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#include <Arduino.h>
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#include <Audio.h>
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#include "effect_mono_stereo.h"
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/*************************************************************************/
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// A u d i o E f f e c t M o n o S t e r e o
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// Written by Holger Wirtz
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// 20191122 - initial version
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#if !defined(_MAPFLOAT)
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#define _MAPFLOAT
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inline float mapfloat(float val, float in_min, float in_max, float out_min, float out_max)
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{
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return (val - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
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}
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#endif
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void AudioEffectMonoStereo::update(void)
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{
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audio_block_t *in;
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audio_block_t *mod;
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audio_block_t *out[2];
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in = receiveReadOnly(0);
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mod = receiveReadOnly(1);
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out[0] = allocate();
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out[1] = allocate();
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if (in && mod && out[0] && out[1])
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{
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int16_t *ip = in->data;
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float pan = mapfloat(mod->data[0], -1.0, 1.0, 0.0, 1.0);
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int16_t *op[2] = { out[0]->data, out[1]->data };
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float f_l = _pseudo_log * sinf(pan * PI / 2); // Pan [L0.0 ... M0.5 ... 1.0R]
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float f_r = _pseudo_log * cosf(pan * PI / 2);
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for (uint16_t i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
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{
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*op[0] = int16_t(f_l * (*ip));
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*op[1] = int16_t(f_r * (*ip));
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op[0]++;
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op[1]++;
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ip++;
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}
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if (in)
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{
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release(in);
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}
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if (mod)
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{
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release(mod);
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}
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for (uint8_t i = 0; i < 2; i++)
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{
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if (out[i])
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{
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transmit(out[i], i);
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release(out[i]);
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}
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}
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}
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}
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