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81 lines
2.9 KiB
81 lines
2.9 KiB
2 years ago
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/*
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MicroDexed
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MicroDexed is a port of the Dexed sound engine
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Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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effect_delay_ext8 is a special delay class for APS6404L-3SQR based memory chips on
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a Teensy-4.1. The cod is a combination of the PJRC delay_ext class and suggestions
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from https://forum.pjrc.com/threads/29276-Limits-of-delay-effect-in-audio-library/page5?highlight=APS6404L-3SQR
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*/
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#ifndef effect_delay_ext8_h_
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#define effect_delay_ext8_h_
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#include "Arduino.h"
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#include "AudioStream.h"
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#include "spi_interrupt.h"
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class AudioEffectDelayExternal8 : public AudioStream
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{
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public:
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AudioEffectDelayExternal8() : AudioStream(1, inputQueueArray) {
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initialize(4194304);
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}
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AudioEffectDelayExternal8(float milliseconds=1e6)
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: AudioStream(1, inputQueueArray) {
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uint32_t n = (milliseconds*(AUDIO_SAMPLE_RATE_EXACT/1000.0f))+0.5f;
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initialize(n);
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}
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void delay(uint8_t channel, float milliseconds) {
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if (channel >= 8) return;
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if (milliseconds < 0.0f) milliseconds = 0.0f;
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uint32_t n = (milliseconds*(AUDIO_SAMPLE_RATE_EXACT/1000.0f))+0.5f;
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n += AUDIO_BLOCK_SAMPLES;
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if (n > memory_length - AUDIO_BLOCK_SAMPLES)
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n = memory_length - AUDIO_BLOCK_SAMPLES;
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delay_length[channel] = n;
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uint8_t mask = activemask;
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if (activemask == 0) AudioStartUsingSPI();
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activemask = mask | (1<<channel);
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}
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void disable(uint8_t channel) {
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if (channel >= 8) return;
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uint8_t mask = activemask & ~(1<<channel);
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activemask = mask;
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if (mask == 0) AudioStopUsingSPI();
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}
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virtual void update(void);
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private:
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void initialize(uint32_t samples);
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void read(uint32_t address, uint32_t count, int16_t *data);
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void write(uint32_t address, uint32_t count, const int16_t *data);
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void zero(uint32_t address, uint32_t count) {
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write(address, count, NULL);
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}
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uint32_t memory_begin; // the first address in the memory we're using
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uint32_t memory_length; // the amount of memory we're using
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uint32_t head_offset; // head index (incoming) data into external memory
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uint32_t delay_length[8]; // # of sample delay for each channel (128 = no delay)
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uint8_t activemask; // which output channels are active
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static uint32_t allocated;
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audio_block_t *inputQueueArray[1];
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};
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#endif
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