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- MicroDexed is a compatible 6-operator-FM-synth based on the Teensy(-3.6/-4.x) Microcontroller.
- https://www.parasitstudio.de
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- 132 lines
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- 4.0 KiB
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- 132 lines
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- 4.0 KiB
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- /* Audio Library for Teensy 3.X
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- * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
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- *
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- * Development of this audio library was funded by PJRC.COM, LLC by sales of
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- * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
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- * open source software by purchasing Teensy or other PJRC products.
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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, development funding notice, and this permission
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- * notice shall be included in all 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
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- * THE SOFTWARE.
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- */
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- #include <Arduino.h>
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- #include "mixer8.h"
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- #include "utility/dspinst.h"
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- #if defined(__ARM_ARCH_7EM__)
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- #define MULTI_UNITYGAIN 65536
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- static void applyGain(int16_t *data, int32_t mult)
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- {
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- uint32_t *p = (uint32_t *)data;
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- const uint32_t *end = (uint32_t *)(data + AUDIO_BLOCK_SAMPLES);
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- do {
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- uint32_t tmp32 = *p; // read 2 samples from *data
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- int32_t val1 = signed_multiply_32x16b(mult, tmp32);
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- int32_t val2 = signed_multiply_32x16t(mult, tmp32);
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- val1 = signed_saturate_rshift(val1, 16, 0);
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- val2 = signed_saturate_rshift(val2, 16, 0);
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- *p++ = pack_16b_16b(val2, val1);
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- } while (p < end);
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- }
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- static void applyGainThenAdd(int16_t *data, const int16_t *in, int32_t mult)
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- uint32_t *dst = (uint32_t *)data;
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- const uint32_t *src = (uint32_t *)in;
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- const uint32_t *end = (uint32_t *)(data + AUDIO_BLOCK_SAMPLES);
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- if (mult == MULTI_UNITYGAIN) {
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- do {
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- uint32_t tmp32 = *dst;
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- *dst++ = signed_add_16_and_16(tmp32, *src++);
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- tmp32 = *dst;
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- *dst++ = signed_add_16_and_16(tmp32, *src++);
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- } while (dst < end);
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- } else {
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- do {
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- uint32_t tmp32 = *src++; // read 2 samples from *data
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- int32_t val1 = signed_multiply_32x16b(mult, tmp32);
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- int32_t val2 = signed_multiply_32x16t(mult, tmp32);
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- val1 = signed_saturate_rshift(val1, 16, 0);
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- val2 = signed_saturate_rshift(val2, 16, 0);
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- tmp32 = pack_16b_16b(val2, val1);
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- uint32_t tmp32b = *dst;
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- *dst++ = signed_add_16_and_16(tmp32, tmp32b);
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- } while (dst < end);
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- }
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- }
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- #elif defined(KINETISL)
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- #define MULTI_UNITYGAIN 256
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- static void applyGain(int16_t *data, int32_t mult)
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- const int16_t *end = data + AUDIO_BLOCK_SAMPLES;
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- do {
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- int32_t val = *data * mult;
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- *data++ = signed_saturate_rshift(val, 16, 0);
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- } while (data < end);
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- }
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- static void applyGainThenAdd(int16_t *dst, const int16_t *src, int32_t mult)
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- {
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- const int16_t *end = dst + AUDIO_BLOCK_SAMPLES;
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- if (mult == MULTI_UNITYGAIN) {
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- do {
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- int32_t val = *dst + *src++;
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- *dst++ = signed_saturate_rshift(val, 16, 0);
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- } while (dst < end);
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- } else {
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- do {
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- int32_t val = *dst + ((*src++ * mult) >> 8); // overflow possible??
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- *dst++ = signed_saturate_rshift(val, 16, 0);
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- } while (dst < end);
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- }
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- }
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- #endif
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- void AudioMixer8::update(void)
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- {
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- audio_block_t *in, *out=NULL;
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- unsigned int channel;
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- for (channel=0; channel < 8; channel++) {
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- if (!out) {
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- out = receiveWritable(channel);
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- if (out) {
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- int32_t mult = multiplier[channel];
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- if (mult != MULTI_UNITYGAIN) applyGain(out->data, mult);
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- }
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- } else {
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- in = receiveReadOnly(channel);
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- if (in) {
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- applyGainThenAdd(out->data, in->data, multiplier[channel]);
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- release(in);
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- }
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- }
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- }
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- if (out) {
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- transmit(out);
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- release(out);
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- }
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- }
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