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94 lines
2.6 KiB
94 lines
2.6 KiB
6 years ago
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/* Modulated delay line
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Inspired by;
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http://musicdsp.org/showArchiveComment.php?ArchiveID=154
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But details changed for Teensy Audio.
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No feedback within the class, just done externally
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so we can add filters and stuff to the loop.
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Delay time is a signal input to the block, and functions from 0 to 0x7fff,
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scaling the delay time accordingly.
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*/
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/*
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Copyright (c) 2016, Byron Jacquot, SparkFun Electronics
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SparkFun code, firmware, and software is released under
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the MIT License(http://opensource.org/licenses/MIT).
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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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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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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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/* from https://forum.pjrc.com/threads/46793-Anyone-Doing-Pitch-Shifting */
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#pragma once
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#ifndef _mod_delay_h_
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#define _mod_delay_h_
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#include "AudioStream.h"
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#include <Arduino.h>
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class AudioEffectModDelayGain: public AudioStream
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{
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public:
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AudioEffectModDelayGain (void) : AudioStream(3, inputQueueArray)
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{
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buffer_length = 0;
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}
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virtual void update(void);
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// Set the parameters
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void setbuf(int32_t delay_len, int16_t* delay_buf )
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{
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delayline_p = delay_buf;
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insert_index = 0;
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buffer_length = delay_len;
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for (int32_t i = 0; i < buffer_length; i++)
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{
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delayline_p[i] = 0;
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}
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};
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void inspect(void)
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{
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Serial.print(insert_index, HEX);
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Serial.print(' ');
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Serial.print(delay_delta, HEX);
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Serial.print(' ');
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Serial.println(buffer_length, HEX);
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};
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private:
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audio_block_t *inputQueueArray[3];
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int16_t *delayline_p;
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int32_t insert_index;
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int32_t buffer_length;
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int32_t delay_delta;
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};
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#endif
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