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95 lines
3.4 KiB
95 lines
3.4 KiB
/* 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 "extmem8.h"
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#include "effect_delay_ext8.h"
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void AudioEffectDelayExternal8::update(void)
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{
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audio_block_t *block;
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uint32_t n, channel, read_offset;
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// grab incoming data and put it into the memory
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block = receiveReadOnly();
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if (memory_type >= AUDIO_MEMORY8_UNDEFINED) {
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// ignore input and do nothing if undefined memory type
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release(block);
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return;
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}
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if (block) {
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if (head_offset + AUDIO_BLOCK_SAMPLES <= memory_length) {
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// a single write is enough
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write(head_offset, AUDIO_BLOCK_SAMPLES, block->data);
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head_offset += AUDIO_BLOCK_SAMPLES;
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} else {
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// write wraps across end-of-memory
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n = memory_length - head_offset;
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write(head_offset, n, block->data);
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head_offset = AUDIO_BLOCK_SAMPLES - n;
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write(0, head_offset, block->data + n);
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}
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release(block);
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} else {
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// if no input, store zeros, so later playback will
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// not be random garbage previously stored in memory
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if (head_offset + AUDIO_BLOCK_SAMPLES <= memory_length) {
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zero(head_offset, AUDIO_BLOCK_SAMPLES);
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head_offset += AUDIO_BLOCK_SAMPLES;
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} else {
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n = memory_length - head_offset;
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zero(head_offset, n);
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head_offset = AUDIO_BLOCK_SAMPLES - n;
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zero(0, head_offset);
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}
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}
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// transmit the delayed outputs
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for (channel = 0; channel < 8; channel++) {
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if (!(activemask & (1<<channel))) continue;
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block = allocate();
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if (!block) continue;
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// compute the delayed location where we read
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if (delay_length[channel] <= head_offset) {
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read_offset = head_offset - delay_length[channel];
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} else {
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read_offset = memory_length + head_offset - delay_length[channel];
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}
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if (read_offset + AUDIO_BLOCK_SAMPLES <= memory_length) {
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// a single read will do it
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read(read_offset, AUDIO_BLOCK_SAMPLES, block->data);
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} else {
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// read wraps across end-of-memory
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n = memory_length - read_offset;
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read(read_offset, n, block->data);
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read(0, AUDIO_BLOCK_SAMPLES - n, block->data + n);
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}
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transmit(block, channel);
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release(block);
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}
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}
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