/* Audio Library for Teensy 3.X Copyright (c) 2018, Paul Stoffregen, paul@pjrc.com Development of this audio library was funded by PJRC.COM, LLC by sales of Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop open source software by purchasing Teensy or other PJRC products. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice, development funding notice, and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ // A fixed point implementation of Freeverb by Jezar at Dreampoint // http://blog.bjornroche.com/2012/06/freeverb-original-public-domain-code-by.html // https://music.columbia.edu/pipermail/music-dsp/2001-October/045433.html #include #include "my_effect_freeverb.h" #include "utility/dspinst.h" MyAudioEffectFreeverb::MyAudioEffectFreeverb() : AudioStream(1, inputQueueArray) { memset(comb1buf, 0, sizeof(comb1buf)); memset(comb2buf, 0, sizeof(comb2buf)); memset(comb3buf, 0, sizeof(comb3buf)); memset(comb4buf, 0, sizeof(comb4buf)); memset(comb5buf, 0, sizeof(comb5buf)); memset(comb6buf, 0, sizeof(comb6buf)); memset(comb7buf, 0, sizeof(comb7buf)); memset(comb8buf, 0, sizeof(comb8buf)); comb1index = 0; comb2index = 0; comb3index = 0; comb4index = 0; comb5index = 0; comb6index = 0; comb7index = 0; comb8index = 0; comb1filter = 0; comb2filter = 0; comb3filter = 0; comb4filter = 0; comb5filter = 0; comb6filter = 0; comb7filter = 0; comb8filter = 0; combdamp1 = 6553; combdamp2 = 26215; combfeeback = 27524; memset(allpass1buf, 0, sizeof(allpass1buf)); memset(allpass2buf, 0, sizeof(allpass2buf)); memset(allpass3buf, 0, sizeof(allpass3buf)); memset(allpass4buf, 0, sizeof(allpass4buf)); allpass1index = 0; allpass2index = 0; allpass3index = 0; allpass4index = 0; } // cleaner sat16 by http://www.moseleyinstruments.com/ static int16_t sat16(int32_t n, int rshift) { // we should always round towards 0 // to avoid recirculating round-off noise // // a 2s complement positive number is always // rounded down, so we only need to take // care of negative numbers if (n < 0) { n = n + (~(0xFFFFFFFFUL << rshift)); } n = n >> rshift; if (n > 32767) { return 32767; } if (n < -32768) { return -32768; } return n; } // TODO: move this to one of the data files, use in output_adat.cpp, output_tdm.cpp, etc static const audio_block_t zeroblock = { 0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #if AUDIO_BLOCK_SAMPLES > 16 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #endif #if AUDIO_BLOCK_SAMPLES > 32 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #endif #if AUDIO_BLOCK_SAMPLES > 48 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #endif #if AUDIO_BLOCK_SAMPLES > 64 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #endif #if AUDIO_BLOCK_SAMPLES > 80 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #endif #if AUDIO_BLOCK_SAMPLES > 96 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #endif #if AUDIO_BLOCK_SAMPLES > 112 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, #endif } }; void MyAudioEffectFreeverb::update() { #if defined(__ARM_ARCH_7EM__) const audio_block_t *block; audio_block_t *outblock; int i; int16_t input, bufout, output; int32_t sum; outblock = allocate(); if (!outblock) { audio_block_t *tmp = receiveReadOnly(0); if (tmp) release(tmp); return; } block = receiveReadOnly(0); if (!block) block = &zeroblock; for (i = 0; i < AUDIO_BLOCK_SAMPLES; i++) { // TODO: scale numerical range depending on roomsize & damping input = sat16(block->data[i] * 8738, 17); // for numerical headroom sum = 0; bufout = comb1buf[comb1index]; sum += bufout; comb1filter = sat16(bufout * combdamp2 + comb1filter * combdamp1, 15); comb1buf[comb1index] = sat16(input + sat16(comb1filter * combfeeback, 15), 0); if (++comb1index >= sizeof(comb1buf) / sizeof(int16_t)) comb1index = 0; bufout = comb2buf[comb2index]; sum += bufout; comb2filter = sat16(bufout * combdamp2 + comb2filter * combdamp1, 15); comb2buf[comb2index] = sat16(input + sat16(comb2filter * combfeeback, 15), 0); if (++comb2index >= sizeof(comb2buf) / sizeof(int16_t)) comb2index = 0; bufout = comb3buf[comb3index]; sum += bufout; comb3filter = sat16(bufout * combdamp2 + comb3filter * combdamp1, 15); comb3buf[comb3index] = sat16(input + sat16(comb3filter * combfeeback, 15), 0); if (++comb3index >= sizeof(comb3buf) / sizeof(int16_t)) comb3index = 0; bufout = comb4buf[comb4index]; sum += bufout; comb4filter = sat16(bufout * combdamp2 + comb4filter * combdamp1, 15); comb4buf[comb4index] = sat16(input + sat16(comb4filter * combfeeback, 15), 0); if (++comb4index >= sizeof(comb4buf) / sizeof(int16_t)) comb4index = 0; bufout = comb5buf[comb5index]; sum += bufout; comb5filter = sat16(bufout * combdamp2 + comb5filter * combdamp1, 15); comb5buf[comb5index] = sat16(input + sat16(comb5filter * combfeeback, 15), 0); if (++comb5index >= sizeof(comb5buf) / sizeof(int16_t)) comb5index = 0; bufout = comb6buf[comb6index]; sum += bufout; comb6filter = sat16(bufout * combdamp2 + comb6filter * combdamp1, 15); comb6buf[comb6index] = sat16(input + sat16(comb6filter * combfeeback, 15), 0); if (++comb6index >= sizeof(comb6buf) / sizeof(int16_t)) comb6index = 0; bufout = comb7buf[comb7index]; sum += bufout; comb7filter = sat16(bufout * combdamp2 + comb7filter * combdamp1, 15); comb7buf[comb7index] = sat16(input + sat16(comb7filter * combfeeback, 15), 0); if (++comb7index >= sizeof(comb7buf) / sizeof(int16_t)) comb7index = 0; bufout = comb8buf[comb8index]; sum += bufout; comb8filter = sat16(bufout * combdamp2 + comb8filter * combdamp1, 15); comb8buf[comb8index] = sat16(input + sat16(comb8filter * combfeeback, 15), 0); if (++comb8index >= sizeof(comb8buf) / sizeof(int16_t)) comb8index = 0; output = sat16(sum * 31457, 17); bufout = allpass1buf[allpass1index]; allpass1buf[allpass1index] = output + (bufout >> 1); output = sat16(bufout - output, 1); if (++allpass1index >= sizeof(allpass1buf) / sizeof(int16_t)) allpass1index = 0; bufout = allpass2buf[allpass2index]; allpass2buf[allpass2index] = output + (bufout >> 1); output = sat16(bufout - output, 1); if (++allpass2index >= sizeof(allpass2buf) / sizeof(int16_t)) allpass2index = 0; bufout = allpass3buf[allpass3index]; allpass3buf[allpass3index] = output + (bufout >> 1); output = sat16(bufout - output, 1); if (++allpass3index >= sizeof(allpass3buf) / sizeof(int16_t)) allpass3index = 0; bufout = allpass4buf[allpass4index]; allpass4buf[allpass4index] = output + (bufout >> 1); output = sat16(bufout - output, 1); if (++allpass4index >= sizeof(allpass4buf) / sizeof(int16_t)) allpass4index = 0; outblock->data[i] = sat16(output * 30, 0); } transmit(outblock); release(outblock); if (block != &zeroblock) release((audio_block_t *)block); #elif defined(KINETISL) audio_block_t *block; block = receiveReadOnly(0); if (block) release(block); #endif } MyAudioEffectFreeverbStereo::MyAudioEffectFreeverbStereo() : AudioStream(1, inputQueueArray) { memset(comb1bufL, 0, sizeof(comb1bufL)); memset(comb2bufL, 0, sizeof(comb2bufL)); memset(comb3bufL, 0, sizeof(comb3bufL)); memset(comb4bufL, 0, sizeof(comb4bufL)); memset(comb5bufL, 0, sizeof(comb5bufL)); memset(comb6bufL, 0, sizeof(comb6bufL)); memset(comb7bufL, 0, sizeof(comb7bufL)); memset(comb8bufL, 0, sizeof(comb8bufL)); comb1indexL = 0; comb2indexL = 0; comb3indexL = 0; comb4indexL = 0; comb5indexL = 0; comb6indexL = 0; comb7indexL = 0; comb8indexL = 0; comb1filterL = 0; comb2filterL = 0; comb3filterL = 0; comb4filterL = 0; comb5filterL = 0; comb6filterL = 0; comb7filterL = 0; comb8filterL = 0; memset(comb1bufR, 0, sizeof(comb1bufR)); memset(comb2bufR, 0, sizeof(comb2bufR)); memset(comb3bufR, 0, sizeof(comb3bufR)); memset(comb4bufR, 0, sizeof(comb4bufR)); memset(comb5bufR, 0, sizeof(comb5bufR)); memset(comb6bufR, 0, sizeof(comb6bufR)); memset(comb7bufR, 0, sizeof(comb7bufR)); memset(comb8bufR, 0, sizeof(comb8bufR)); comb1indexR = 0; comb2indexR = 0; comb3indexR = 0; comb4indexR = 0; comb5indexR = 0; comb6indexR = 0; comb7indexR = 0; comb8indexR = 0; comb1filterR = 0; comb2filterR = 0; comb3filterR = 0; comb4filterR = 0; comb5filterR = 0; comb6filterR = 0; comb7filterR = 0; comb8filterR = 0; combdamp1 = 6553; combdamp2 = 26215; combfeeback = 27524; memset(allpass1bufL, 0, sizeof(allpass1bufL)); memset(allpass2bufL, 0, sizeof(allpass2bufL)); memset(allpass3bufL, 0, sizeof(allpass3bufL)); memset(allpass4bufL, 0, sizeof(allpass4bufL)); allpass1indexL = 0; allpass2indexL = 0; allpass3indexL = 0; allpass4indexL = 0; memset(allpass1bufR, 0, sizeof(allpass1bufR)); memset(allpass2bufR, 0, sizeof(allpass2bufR)); memset(allpass3bufR, 0, sizeof(allpass3bufR)); memset(allpass4bufR, 0, sizeof(allpass4bufR)); allpass1indexR = 0; allpass2indexR = 0; allpass3indexR = 0; allpass4indexR = 0; } void MyAudioEffectFreeverbStereo::update() { #if defined(__ARM_ARCH_7EM__) const audio_block_t *block; audio_block_t *outblockL; audio_block_t *outblockR; int i; int16_t input, bufout, outputL, outputR; int32_t sum; block = receiveReadOnly(0); outblockL = allocate(); outblockR = allocate(); if (!outblockL || !outblockR) { if (outblockL) release(outblockL); if (outblockR) release(outblockR); if (block) release((audio_block_t *)block); return; } if (!block) block = &zeroblock; for (i = 0; i < AUDIO_BLOCK_SAMPLES; i++) { // TODO: scale numerical range depending on roomsize & damping input = sat16(block->data[i] * 8738, 17); // for numerical headroom sum = 0; bufout = comb1bufL[comb1indexL]; sum += bufout; comb1filterL = sat16(bufout * combdamp2 + comb1filterL * combdamp1, 15); comb1bufL[comb1indexL] = sat16(input + sat16(comb1filterL * combfeeback, 15), 0); if (++comb1indexL >= sizeof(comb1bufL) / sizeof(int16_t)) comb1indexL = 0; bufout = comb2bufL[comb2indexL]; sum += bufout; comb2filterL = sat16(bufout * combdamp2 + comb2filterL * combdamp1, 15); comb2bufL[comb2indexL] = sat16(input + sat16(comb2filterL * combfeeback, 15), 0); if (++comb2indexL >= sizeof(comb2bufL) / sizeof(int16_t)) comb2indexL = 0; bufout = comb3bufL[comb3indexL]; sum += bufout; comb3filterL = sat16(bufout * combdamp2 + comb3filterL * combdamp1, 15); comb3bufL[comb3indexL] = sat16(input + sat16(comb3filterL * combfeeback, 15), 0); if (++comb3indexL >= sizeof(comb3bufL) / sizeof(int16_t)) comb3indexL = 0; bufout = comb4bufL[comb4indexL]; sum += bufout; comb4filterL = sat16(bufout * combdamp2 + comb4filterL * combdamp1, 15); comb4bufL[comb4indexL] = sat16(input + sat16(comb4filterL * combfeeback, 15), 0); if (++comb4indexL >= sizeof(comb4bufL) / sizeof(int16_t)) comb4indexL = 0; bufout = comb5bufL[comb5indexL]; sum += bufout; comb5filterL = sat16(bufout * combdamp2 + comb5filterL * combdamp1, 15); comb5bufL[comb5indexL] = sat16(input + sat16(comb5filterL * combfeeback, 15), 0); if (++comb5indexL >= sizeof(comb5bufL) / sizeof(int16_t)) comb5indexL = 0; bufout = comb6bufL[comb6indexL]; sum += bufout; comb6filterL = sat16(bufout * combdamp2 + comb6filterL * combdamp1, 15); comb6bufL[comb6indexL] = sat16(input + sat16(comb6filterL * combfeeback, 15), 0); if (++comb6indexL >= sizeof(comb6bufL) / sizeof(int16_t)) comb6indexL = 0; bufout = comb7bufL[comb7indexL]; sum += bufout; comb7filterL = sat16(bufout * combdamp2 + comb7filterL * combdamp1, 15); comb7bufL[comb7indexL] = sat16(input + sat16(comb7filterL * combfeeback, 15), 0); if (++comb7indexL >= sizeof(comb7bufL) / sizeof(int16_t)) comb7indexL = 0; bufout = comb8bufL[comb8indexL]; sum += bufout; comb8filterL = sat16(bufout * combdamp2 + comb8filterL * combdamp1, 15); comb8bufL[comb8indexL] = sat16(input + sat16(comb8filterL * combfeeback, 15), 0); if (++comb8indexL >= sizeof(comb8bufL) / sizeof(int16_t)) comb8indexL = 0; outputL = sat16(sum * 31457, 17); sum = 0; bufout = comb1bufR[comb1indexR]; sum += bufout; comb1filterR = sat16(bufout * combdamp2 + comb1filterR * combdamp1, 15); comb1bufR[comb1indexR] = sat16(input + sat16(comb1filterR * combfeeback, 15), 0); if (++comb1indexR >= sizeof(comb1bufR) / sizeof(int16_t)) comb1indexR = 0; bufout = comb2bufR[comb2indexR]; sum += bufout; comb2filterR = sat16(bufout * combdamp2 + comb2filterR * combdamp1, 15); comb2bufR[comb2indexR] = sat16(input + sat16(comb2filterR * combfeeback, 15), 0); if (++comb2indexR >= sizeof(comb2bufR) / sizeof(int16_t)) comb2indexR = 0; bufout = comb3bufR[comb3indexR]; sum += bufout; comb3filterR = sat16(bufout * combdamp2 + comb3filterR * combdamp1, 15); comb3bufR[comb3indexR] = sat16(input + sat16(comb3filterR * combfeeback, 15), 0); if (++comb3indexR >= sizeof(comb3bufR) / sizeof(int16_t)) comb3indexR = 0; bufout = comb4bufR[comb4indexR]; sum += bufout; comb4filterR = sat16(bufout * combdamp2 + comb4filterR * combdamp1, 15); comb4bufR[comb4indexR] = sat16(input + sat16(comb4filterR * combfeeback, 15), 0); if (++comb4indexR >= sizeof(comb4bufR) / sizeof(int16_t)) comb4indexR = 0; bufout = comb5bufR[comb5indexR]; sum += bufout; comb5filterR = sat16(bufout * combdamp2 + comb5filterR * combdamp1, 15); comb5bufR[comb5indexR] = sat16(input + sat16(comb5filterR * combfeeback, 15), 0); if (++comb5indexR >= sizeof(comb5bufR) / sizeof(int16_t)) comb5indexR = 0; bufout = comb6bufR[comb6indexR]; sum += bufout; comb6filterR = sat16(bufout * combdamp2 + comb6filterR * combdamp1, 15); comb6bufR[comb6indexR] = sat16(input + sat16(comb6filterR * combfeeback, 15), 0); if (++comb6indexR >= sizeof(comb6bufR) / sizeof(int16_t)) comb6indexR = 0; bufout = comb7bufR[comb7indexR]; sum += bufout; comb7filterR = sat16(bufout * combdamp2 + comb7filterR * combdamp1, 15); comb7bufR[comb7indexR] = sat16(input + sat16(comb7filterR * combfeeback, 15), 0); if (++comb7indexR >= sizeof(comb7bufR) / sizeof(int16_t)) comb7indexR = 0; bufout = comb8bufR[comb8indexR]; sum += bufout; comb8filterR = sat16(bufout * combdamp2 + comb8filterR * combdamp1, 15); comb8bufR[comb8indexR] = sat16(input + sat16(comb8filterR * combfeeback, 15), 0); if (++comb8indexR >= sizeof(comb8bufR) / sizeof(int16_t)) comb8indexR = 0; outputR = sat16(sum * 31457, 17); bufout = allpass1bufL[allpass1indexL]; allpass1bufL[allpass1indexL] = outputL + (bufout >> 1); outputL = sat16(bufout - outputL, 1); if (++allpass1indexL >= sizeof(allpass1bufL) / sizeof(int16_t)) allpass1indexL = 0; bufout = allpass2bufL[allpass2indexL]; allpass2bufL[allpass2indexL] = outputL + (bufout >> 1); outputL = sat16(bufout - outputL, 1); if (++allpass2indexL >= sizeof(allpass2bufL) / sizeof(int16_t)) allpass2indexL = 0; bufout = allpass3bufL[allpass3indexL]; allpass3bufL[allpass3indexL] = outputL + (bufout >> 1); outputL = sat16(bufout - outputL, 1); if (++allpass3indexL >= sizeof(allpass3bufL) / sizeof(int16_t)) allpass3indexL = 0; bufout = allpass4bufL[allpass4indexL]; allpass4bufL[allpass4indexL] = outputL + (bufout >> 1); outputL = sat16(bufout - outputL, 1); if (++allpass4indexL >= sizeof(allpass4bufL) / sizeof(int16_t)) allpass4indexL = 0; outblockL->data[i] = sat16(outputL * 30, 0); bufout = allpass1bufR[allpass1indexR]; allpass1bufR[allpass1indexR] = outputR + (bufout >> 1); outputR = sat16(bufout - outputR, 1); if (++allpass1indexR >= sizeof(allpass1bufR) / sizeof(int16_t)) allpass1indexR = 0; bufout = allpass2bufR[allpass2indexR]; allpass2bufR[allpass2indexR] = outputR + (bufout >> 1); outputR = sat16(bufout - outputR, 1); if (++allpass2indexR >= sizeof(allpass2bufR) / sizeof(int16_t)) allpass2indexR = 0; bufout = allpass3bufR[allpass3indexR]; allpass3bufR[allpass3indexR] = outputR + (bufout >> 1); outputR = sat16(bufout - outputR, 1); if (++allpass3indexR >= sizeof(allpass3bufR) / sizeof(int16_t)) allpass3indexR = 0; bufout = allpass4bufR[allpass4indexR]; allpass4bufR[allpass4indexR] = outputR + (bufout >> 1); outputR = sat16(bufout - outputR, 1); if (++allpass4indexR >= sizeof(allpass4bufR) / sizeof(int16_t)) allpass4indexR = 0; outblockR->data[i] = sat16(outputL * 30, 0); } transmit(outblockL, 0); transmit(outblockR, 1); release(outblockL); release(outblockR); if (block != &zeroblock) release((audio_block_t *)block); #elif defined(KINETISL) audio_block_t *block; block = receiveReadOnly(0); if (block) release(block); #endif }