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138 lines
3.7 KiB
138 lines
3.7 KiB
/*
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Copyright (c) 2021 H. 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 "limits.h"
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#include "effect_stereo_panorama.h"
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// Written by Holger Wirtz
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// 20211124 - initial version
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static const audio_block_t zeroblock = {
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0, 0, 0, {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#if AUDIO_BLOCK_SAMPLES > 16
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#endif
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#if AUDIO_BLOCK_SAMPLES > 32
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#endif
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#if AUDIO_BLOCK_SAMPLES > 48
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#endif
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#if AUDIO_BLOCK_SAMPLES > 64
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#endif
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#if AUDIO_BLOCK_SAMPLES > 80
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#endif
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#if AUDIO_BLOCK_SAMPLES > 96
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#endif
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#if AUDIO_BLOCK_SAMPLES > 112
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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#endif
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#if AUDIO_BLOCK_SAMPLES > 128
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#error AUDIO_BLOCK_SAMPLES > 128 is a problem for this class
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#endif
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}
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};
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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 AudioEffectStereoPanorama::panorama(float p)
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{
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//pan = mapfloat(p, -1.0, 1.0, 1.0, 0.0);
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if (p == 0.5)
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pan_l = pan_r = 1.0;
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else if (p > 0.5)
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{
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pan_r = 0.5 - abs(0.5 - p);
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pan_l = 1.0 - pan_r;
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}
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else
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{
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pan_l = 0.5 - abs(0.5 - p);
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pan_r = 1.0 - p;
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}
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}
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void AudioEffectStereoPanorama::update(void)
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{
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audio_block_t *in[2];
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audio_block_t *out[2];
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in[0] = receiveReadOnly(0);
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if (!in[0])
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in[0] = (audio_block_t*)&zeroblock;
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in[1] = receiveReadOnly(1);
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if (!in[1])
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in[1] = (audio_block_t*)&zeroblock;
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out[0] = allocate();
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out[1] = allocate();
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if (in[0] && in[1] && out[0] && out[1])
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{
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arm_q15_to_float(in[0]->data, in_f[0], AUDIO_BLOCK_SAMPLES);
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arm_q15_to_float(in[1]->data, in_f[1], AUDIO_BLOCK_SAMPLES);
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for (uint16_t n = 0; n < AUDIO_BLOCK_SAMPLES; n++)
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{
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out_f[0][n] = in_f[0][n] * pan_r;
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out_f[0][n] += in_f[1][n] * pan_l;
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out_f[1][n] = in_f[1][n] * pan_r;
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out_f[1][n] += in_f[0][n] * pan_l;
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}
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arm_float_to_q15(out_f[0], out[0]->data, AUDIO_BLOCK_SAMPLES);
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arm_float_to_q15(out_f[1], out[1]->data, AUDIO_BLOCK_SAMPLES);
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}
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if (in[0] != (audio_block_t*)&zeroblock)
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{
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release(in[0]);
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}
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if (in[1] != (audio_block_t*)&zeroblock)
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{
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release(in[1]);
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}
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if (out[0])
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{
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transmit(out[0], 0);
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release(out[0]);
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}
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if (out[1])
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{
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transmit(out[1], 1);
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release(out[1]);
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}
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}
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