119 lines
3.2 KiB
C++
Executable file
119 lines
3.2 KiB
C++
Executable file
/* Reverb for Teensy
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*
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* Author: Joao Rossi Filho
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* joaorossifilho@gmail.com
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*
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* Soon I'll make a commit with nice comments and discription
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*
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* Copyright (c) 2016 Joao Rossi FIlho
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*
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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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*
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* The above copyright notice and this permission notice shall be included in all
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* 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
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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 THE
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* SOFTWARE.
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*/
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#ifndef effect_reverb_
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#define effect_reverb_
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#include "AudioStream.h"
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#define APF1_BUF_LEN 600
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#define APF2_BUF_LEN 1300
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#define APF3_BUF_LEN 500
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#define LPF1_BUF_LEN 1400
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#define LPF2_BUF_LEN 1700
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#define LPF3_BUF_LEN 1800
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#define LPF4_BUF_LEN 2000
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#define APF1_DLY_LEN 586
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#define APF2_DLY_LEN 1239
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#define APF3_DLY_LEN 485
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#define LPF1_DLY_LEN 1398
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#define LPF2_DLY_LEN 1637
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#define LPF3_DLY_LEN 1774
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#define LPF4_DLY_LEN 1947
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#define LPF1_DLY_SEC 0.03171
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#define LPF2_DLY_SEC 0.03711
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#define LPF3_DLY_SEC 0.04023
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#define LPF4_DLY_SEC 0.04414
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class AudioEffectReverb : public AudioStream
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{
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public:
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AudioEffectReverb(void) : AudioStream(1, inputQueueArray) {
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init_comb_filters();
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clear_buffers();
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reverbTime(5.0);
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}
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virtual void update(void);
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void reverbTime(float);
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private:
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struct comb_apf {
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int32_t g;
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int32_t *buffer;
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uint32_t buf_len;
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uint32_t delay, rd_idx, wr_idx;
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};
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struct comb_lpf {
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int32_t g1, g2, z1;
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int32_t *buffer;
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uint32_t buf_len;
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uint32_t delay, rd_idx, wr_idx;
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};
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void init_comb_filters(void);
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void clear_buffers(void);
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static void _do_comb_apf(struct comb_apf *apf, int32_t *in_buf, int32_t *out_buf);
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static void _do_comb_lpf(struct comb_lpf *lpf, int32_t *in_buf, int32_t *out_buf);
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audio_block_t *inputQueueArray[1];
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struct comb_apf apf[3];
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struct comb_lpf lpf[4];
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float reverb_time_sec;
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float g_flt_apf[3];
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int32_t g_q31_apf[3];
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float g1_flt_lpf[4];
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int32_t g1_q31_lpf[4];
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float g2_flt_lpf;
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int32_t g2_q31_lpf;
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int32_t apf1_buf[APF1_BUF_LEN];
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int32_t apf2_buf[APF2_BUF_LEN];
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int32_t apf3_buf[APF3_BUF_LEN];
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int32_t lpf1_buf[LPF1_BUF_LEN];
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int32_t lpf2_buf[LPF2_BUF_LEN];
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int32_t lpf3_buf[LPF3_BUF_LEN];
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int32_t lpf4_buf[LPF4_BUF_LEN];
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int32_t q31_buf[AUDIO_BLOCK_SAMPLES];
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int32_t sum_buf[AUDIO_BLOCK_SAMPLES];
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int32_t aux_buf[AUDIO_BLOCK_SAMPLES];
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};
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#endif
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