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324 lines
9.8 KiB
324 lines
9.8 KiB
/*
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* AudioEffectAnalogDelay.cpp
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*
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* Created on: Jan 7, 2018
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* Author: slascos
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*/
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#include <new>
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#include "AudioEffectAnalogDelayFilters.h"
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#include "AudioEffectAnalogDelay.h"
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using namespace BALibrary;
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namespace BAEffects {
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constexpr int MIDI_CHANNEL = 0;
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constexpr int MIDI_CONTROL = 1;
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AudioEffectAnalogDelay::AudioEffectAnalogDelay(float maxDelayMs)
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: AudioStream(1, m_inputQueueArray)
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{
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m_memory = new AudioDelay(maxDelayMs);
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m_maxDelaySamples = calcAudioSamples(maxDelayMs);
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m_constructFilter();
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}
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AudioEffectAnalogDelay::AudioEffectAnalogDelay(size_t numSamples)
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: AudioStream(1, m_inputQueueArray)
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{
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m_memory = new AudioDelay(numSamples);
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m_maxDelaySamples = numSamples;
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m_constructFilter();
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}
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// requires preallocated memory large enough
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AudioEffectAnalogDelay::AudioEffectAnalogDelay(ExtMemSlot *slot)
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: AudioStream(1, m_inputQueueArray)
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{
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m_memory = new AudioDelay(slot);
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m_maxDelaySamples = (slot->size() / sizeof(int16_t));
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m_externalMemory = true;
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m_constructFilter();
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}
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AudioEffectAnalogDelay::~AudioEffectAnalogDelay()
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{
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if (m_memory) delete m_memory;
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if (m_iir) delete m_iir;
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}
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// This function just sets up the default filter and coefficients
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void AudioEffectAnalogDelay::m_constructFilter(void)
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{
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// Use DM3 coefficients by default
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m_iir = new IirBiQuadFilterHQ(DM3_NUM_STAGES, reinterpret_cast<const int32_t *>(&DM3), DM3_COEFF_SHIFT);
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}
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void AudioEffectAnalogDelay::setFilterCoeffs(int numStages, const int32_t *coeffs, int coeffShift)
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{
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m_iir->changeFilterCoeffs(numStages, coeffs, coeffShift);
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}
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void AudioEffectAnalogDelay::setFilter(Filter filter)
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{
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switch(filter) {
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case Filter::WARM :
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m_iir->changeFilterCoeffs(WARM_NUM_STAGES, reinterpret_cast<const int32_t *>(&WARM), WARM_COEFF_SHIFT);
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break;
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case Filter::DARK :
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m_iir->changeFilterCoeffs(DARK_NUM_STAGES, reinterpret_cast<const int32_t *>(&DARK), DARK_COEFF_SHIFT);
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break;
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case Filter::DM3 :
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default:
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m_iir->changeFilterCoeffs(DM3_NUM_STAGES, reinterpret_cast<const int32_t *>(&DM3), DM3_COEFF_SHIFT);
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break;
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}
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}
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void AudioEffectAnalogDelay::update(void)
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{
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audio_block_t *inputAudioBlock = receiveReadOnly(); // get the next block of input samples
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// Check is block is disabled
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if (m_enable == false) {
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// do not transmit or process any audio, return as quickly as possible.
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if (inputAudioBlock) release(inputAudioBlock);
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// release all held memory resources
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if (m_previousBlock) {
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release(m_previousBlock); m_previousBlock = nullptr;
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}
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if (!m_externalMemory) {
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// when using internal memory we have to release all references in the ring buffer
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while (m_memory->getRingBuffer()->size() > 0) {
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audio_block_t *releaseBlock = m_memory->getRingBuffer()->front();
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m_memory->getRingBuffer()->pop_front();
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if (releaseBlock) release(releaseBlock);
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}
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}
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return;
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}
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// Check is block is bypassed, if so either transmit input directly or create silence
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if (m_bypass == true) {
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// transmit the input directly
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if (!inputAudioBlock) {
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// create silence
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inputAudioBlock = allocate();
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if (!inputAudioBlock) { return; } // failed to allocate
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else {
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clearAudioBlock(inputAudioBlock);
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}
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}
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transmit(inputAudioBlock, 0);
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release(inputAudioBlock);
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return;
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}
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// Otherwise perform normal processing
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// In order to make use of the SPI DMA, we need to request the read from memory first,
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// then do other processing while it fills in the back.
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audio_block_t *blockToOutput = nullptr; // this will hold the output audio
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blockToOutput = allocate();
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if (!blockToOutput) return; // skip this update cycle due to failure
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// get the data. If using external memory with DMA, this won't be filled until
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// later.
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m_memory->getSamples(blockToOutput, m_delaySamples);
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// If using DMA, we need something else to do while that read executes, so
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// move on to input preprocessing
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// Preprocessing
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audio_block_t *preProcessed = allocate();
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// mix the input with the feedback path in the pre-processing stage
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m_preProcessing(preProcessed, inputAudioBlock, m_previousBlock);
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// consider doing the BBD post processing here to use up more time while waiting
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// for the read data to come back
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audio_block_t *blockToRelease = m_memory->addBlock(preProcessed);
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// BACK TO OUTPUT PROCESSING
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// Check if external DMA, if so, we need to be sure the read is completed
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if (m_externalMemory && m_memory->getSlot()->isUseDma()) {
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// Using DMA
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while (m_memory->getSlot()->isReadBusy()) {}
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}
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// perform the wet/dry mix mix
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m_postProcessing(blockToOutput, inputAudioBlock, blockToOutput);
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transmit(blockToOutput);
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release(inputAudioBlock);
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release(m_previousBlock);
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m_previousBlock = blockToOutput;
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if (m_blockToRelease) release(m_blockToRelease);
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m_blockToRelease = blockToRelease;
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}
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void AudioEffectAnalogDelay::delay(float milliseconds)
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{
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size_t delaySamples = calcAudioSamples(milliseconds);
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if (delaySamples > m_memory->getMaxDelaySamples()) {
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// this exceeds max delay value, limit it.
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delaySamples = m_memory->getMaxDelaySamples();
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}
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if (!m_memory) { Serial.println("delay(): m_memory is not valid"); }
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if (!m_externalMemory) {
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// internal memory
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//QueuePosition queuePosition = calcQueuePosition(milliseconds);
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//Serial.println(String("CONFIG: delay:") + delaySamples + String(" queue position ") + queuePosition.index + String(":") + queuePosition.offset);
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} else {
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// external memory
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//Serial.println(String("CONFIG: delay:") + delaySamples);
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ExtMemSlot *slot = m_memory->getSlot();
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if (!slot) { Serial.println("ERROR: slot ptr is not valid"); }
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if (!slot->isEnabled()) {
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slot->enable();
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Serial.println("WEIRD: slot was not enabled");
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}
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}
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m_delaySamples = delaySamples;
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}
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void AudioEffectAnalogDelay::delay(size_t delaySamples)
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{
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if (!m_memory) { Serial.println("delay(): m_memory is not valid"); }
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if (!m_externalMemory) {
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// internal memory
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//QueuePosition queuePosition = calcQueuePosition(delaySamples);
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//Serial.println(String("CONFIG: delay:") + delaySamples + String(" queue position ") + queuePosition.index + String(":") + queuePosition.offset);
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} else {
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// external memory
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//Serial.println(String("CONFIG: delay:") + delaySamples);
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ExtMemSlot *slot = m_memory->getSlot();
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if (!slot->isEnabled()) {
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slot->enable();
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}
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}
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m_delaySamples = delaySamples;
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}
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void AudioEffectAnalogDelay::delayFractionMax(float delayFraction)
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{
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size_t delaySamples = static_cast<size_t>(static_cast<float>(m_memory->getMaxDelaySamples()) * delayFraction);
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if (delaySamples > m_memory->getMaxDelaySamples()) {
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// this exceeds max delay value, limit it.
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delaySamples = m_memory->getMaxDelaySamples();
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}
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if (!m_memory) { Serial.println("delay(): m_memory is not valid"); }
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if (!m_externalMemory) {
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// internal memory
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//QueuePosition queuePosition = calcQueuePosition(delaySamples);
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//Serial.println(String("CONFIG: delay:") + delaySamples + String(" queue position ") + queuePosition.index + String(":") + queuePosition.offset);
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} else {
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// external memory
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//Serial.println(String("CONFIG: delay:") + delaySamples);
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ExtMemSlot *slot = m_memory->getSlot();
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if (!slot->isEnabled()) {
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slot->enable();
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}
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}
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m_delaySamples = delaySamples;
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}
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void AudioEffectAnalogDelay::m_preProcessing(audio_block_t *out, audio_block_t *dry, audio_block_t *wet)
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{
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if ( out && dry && wet) {
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alphaBlend(out, dry, wet, m_feedback);
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m_iir->process(out->data, out->data, AUDIO_BLOCK_SAMPLES);
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} else if (dry) {
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memcpy(out->data, dry->data, sizeof(int16_t) * AUDIO_BLOCK_SAMPLES);
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}
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}
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void AudioEffectAnalogDelay::m_postProcessing(audio_block_t *out, audio_block_t *dry, audio_block_t *wet)
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{
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if (!out) return; // no valid output buffer
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if ( out && dry && wet) {
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// Simulate the LPF IIR nature of the analog systems
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//m_iir->process(wet->data, wet->data, AUDIO_BLOCK_SAMPLES);
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alphaBlend(out, dry, wet, m_mix);
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} else if (dry) {
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memcpy(out->data, dry->data, sizeof(int16_t) * AUDIO_BLOCK_SAMPLES);
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}
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// Set the output volume
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gainAdjust(out, out, m_volume, 1);
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}
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void AudioEffectAnalogDelay::processMidi(int channel, int control, int value)
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{
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float val = (float)value / 127.0f;
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if ((m_midiConfig[DELAY][MIDI_CHANNEL] == channel) &&
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(m_midiConfig[DELAY][MIDI_CONTROL] == control)) {
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// Delay
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if (m_externalMemory) { m_maxDelaySamples = m_memory->getSlot()->size() / sizeof(int16_t); }
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size_t delayVal = (size_t)(val * (float)m_maxDelaySamples);
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delay(delayVal);
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Serial.println(String("AudioEffectAnalogDelay::delay (ms): ") + calcAudioTimeMs(delayVal)
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+ String(" (samples): ") + delayVal + String(" out of ") + m_maxDelaySamples);
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return;
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}
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if ((m_midiConfig[BYPASS][MIDI_CHANNEL] == channel) &&
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(m_midiConfig[BYPASS][MIDI_CONTROL] == control)) {
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// Bypass
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if (value >= 65) { bypass(false); Serial.println(String("AudioEffectAnalogDelay::not bypassed -> ON") + value); }
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else { bypass(true); Serial.println(String("AudioEffectAnalogDelay::bypassed -> OFF") + value); }
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return;
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}
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if ((m_midiConfig[FEEDBACK][MIDI_CHANNEL] == channel) &&
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(m_midiConfig[FEEDBACK][MIDI_CONTROL] == control)) {
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// Feedback
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Serial.println(String("AudioEffectAnalogDelay::feedback: ") + 100*val + String("%"));
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feedback(val);
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return;
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}
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if ((m_midiConfig[MIX][MIDI_CHANNEL] == channel) &&
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(m_midiConfig[MIX][MIDI_CONTROL] == control)) {
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// Mix
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Serial.println(String("AudioEffectAnalogDelay::mix: Dry: ") + 100*(1-val) + String("% Wet: ") + 100*val );
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mix(val);
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return;
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}
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if ((m_midiConfig[VOLUME][MIDI_CHANNEL] == channel) &&
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(m_midiConfig[VOLUME][MIDI_CONTROL] == control)) {
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// Volume
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Serial.println(String("AudioEffectAnalogDelay::volume: ") + 100*val + String("%"));
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volume(val);
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return;
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}
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}
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void AudioEffectAnalogDelay::mapMidiControl(int parameter, int midiCC, int midiChannel)
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{
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if (parameter >= NUM_CONTROLS) {
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return ; // Invalid midi parameter
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}
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m_midiConfig[parameter][MIDI_CHANNEL] = midiChannel;
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m_midiConfig[parameter][MIDI_CONTROL] = midiCC;
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}
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}
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