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OpenAudio_ArduinoLibrary/synth_pinknoise_f32.h

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2.7 KiB

/*
Extended to f32 data
Created: Chip Audette, OpenAudio, Feb 2017
License: MIT License. Use at your own risk.
*/
/* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef synth_pinknoise_f32_h_
#define synth_pinknoise_f32_h_
#include "Arduino.h"
#include "AudioStream.h"
#include "AudioStream_F32.h"
#include "utility/dspinst.h"
class AudioSynthNoisePink_F32 : public AudioStream_F32
{
//GUI: inputs:0, outputs:1 //this line used for automatic generation of GUI node
//GUI: shortName:pinknoise //this line used for automatic generation of GUI node
public:
AudioSynthNoisePink_F32() : AudioStream_F32(0, NULL) {
plfsr = 0x5EED41F5 + instance_cnt++;
paccu = 0;
pncnt = 0;
pinc = 0x0CCC;
pdec = 0x0CCC;
enabled = 1;
}
void amplitude(float n) {
if (n < 0.0) n = 0.0;
else if (n > 1.0) n = 1.0;
level = (int32_t)(n * 65536.0);
}
virtual void update(void);
int enabled = 0;
private:
static const uint8_t pnmask[256];
static const int32_t pfira[64];
static const int32_t pfirb[64];
static int16_t instance_cnt;
int32_t plfsr; // linear feedback shift register
int32_t pinc; // increment for all noise sources (bits)
int32_t pdec; // decrement for all noise sources
int32_t paccu; // accumulator
uint8_t pncnt; // overflowing counter as index to pnmask[]
int32_t level; // 0=off, 65536=max
};
#endif