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78 lines
2.5 KiB
78 lines
2.5 KiB
5 years ago
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/*
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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_auto_pan.h"
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/*************************************************************************/
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// A u d i o E f f e c t A u t o P a n
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// Written by Holger Wirtz
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// 20191205 - initial version
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void AudioEffectAutoPan::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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arm_q15_to_float(in->data, in_f, AUDIO_BLOCK_SAMPLES);
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arm_q15_to_float(mod->data, pan_f, AUDIO_BLOCK_SAMPLES);
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arm_offset_f32(pan_f, 1.0, pan_f, AUDIO_BLOCK_SAMPLES);
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arm_scale_f32(pan_f, PI / 4.0, pan_f, AUDIO_BLOCK_SAMPLES); // PI/4
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// right
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for (uint8_t n = 0; n < AUDIO_BLOCK_SAMPLES; n++)
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out_f[0][n] = in_f[n] * _pseudo_log * arm_sin_f32(pan_f[n]);
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arm_float_to_q15 (out_f[0], out[0]->data, AUDIO_BLOCK_SAMPLES);
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// left
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for (uint8_t n = 0; n < AUDIO_BLOCK_SAMPLES; n++)
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out_f[1][n] = in_f[n] * _pseudo_log * arm_cos_f32(pan_f[n]);
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arm_float_to_q15 (out_f[1], out[1]->data, AUDIO_BLOCK_SAMPLES);
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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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