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62 lines
2.1 KiB
62 lines
2.1 KiB
8 years ago
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/*
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synth_whitenoise_F32
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Extended by: Chip Audette, OpenAudio, Feb 2017
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License: MIT License. Use at your own risk.
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*/
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/* 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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#ifndef synth_whitenoise_f32_h_
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#define synth_whitenoise_f32_h_
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#include "Arduino.h"
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#include "AudioStream.h"
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#include "AudioStream_F32.h"
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#include "utility/dspinst.h"
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class AudioSynthNoiseWhite_F32 : public AudioStream_F32
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{
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public:
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AudioSynthNoiseWhite_F32() : AudioStream_F32(0, NULL) {
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level = 0;
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seed = 1 + instance_count++;
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}
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void amplitude(float n) {
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if (n < 0.0) n = 0.0;
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else if (n > 1.0) n = 1.0;
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level = (int32_t)(n * 65536.0);
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}
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virtual void update(void);
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private:
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int32_t level; // 0=off, 65536=max
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uint32_t seed; // must start at 1
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static uint16_t instance_count;
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};
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#endif
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