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127 lines
4.1 KiB
127 lines
4.1 KiB
/*
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Extended to F32
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Created: Chip Audette, OpenAudio, Feb 2017
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Extended to Teensy 4.x Bob larkn June 2020
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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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#include "synth_whitenoise_f32.h"
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// Park-Miller-Carta Pseudo-Random Number Generator
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// http://www.firstpr.com.au/dsp/rand31/
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void AudioSynthNoiseWhite_F32::update(void)
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{
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audio_block_t *block;
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audio_block_f32_t *block_f32;
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uint32_t *p, *end;
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int32_t n1, n2, gain;
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uint32_t lo, hi, val1, val2;
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//Serial.println("synth_whitenoise: update()");
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gain = level;
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if (gain == 0) {
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//Serial.println(": Gain = 0, returning.");
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return;
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}
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block = AudioStream::allocate();
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block_f32 = AudioStream_F32::allocate_f32();
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if (!block | !block_f32) {
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//Serial.println(": NULL block. returning.");
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return;
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}
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p = (uint32_t *)(block->data);
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//end = p + AUDIO_BLOCK_SAMPLES/2;
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end = p + (block_f32->length)/2;
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lo = seed;
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do {
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#if ( defined(KINETISK) || defined(__IMXRT1062__) )
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hi = multiply_16bx16t(16807, lo); // 16807 * (lo >> 16)
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lo = 16807 * (lo & 0xFFFF);
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lo += (hi & 0x7FFF) << 16;
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lo += hi >> 15;
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lo = (lo & 0x7FFFFFFF) + (lo >> 31);
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n1 = signed_multiply_32x16b(gain, lo);
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hi = multiply_16bx16t(16807, lo); // 16807 * (lo >> 16)
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lo = 16807 * (lo & 0xFFFF);
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lo += (hi & 0x7FFF) << 16;
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lo += hi >> 15;
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lo = (lo & 0x7FFFFFFF) + (lo >> 31);
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n2 = signed_multiply_32x16b(gain, lo);
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val1 = pack_16b_16b(n2, n1);
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hi = multiply_16bx16t(16807, lo); // 16807 * (lo >> 16)
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lo = 16807 * (lo & 0xFFFF);
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lo += (hi & 0x7FFF) << 16;
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lo += hi >> 15;
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lo = (lo & 0x7FFFFFFF) + (lo >> 31);
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n1 = signed_multiply_32x16b(gain, lo);
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hi = multiply_16bx16t(16807, lo); // 16807 * (lo >> 16)
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lo = 16807 * (lo & 0xFFFF);
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lo += (hi & 0x7FFF) << 16;
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lo += hi >> 15;
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lo = (lo & 0x7FFFFFFF) + (lo >> 31);
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n2 = signed_multiply_32x16b(gain, lo);
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val2 = pack_16b_16b(n2, n1);
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*p++ = val1;
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*p++ = val2;
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#elif defined(KINETISL)
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hi = 16807 * (lo >> 16);
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lo = 16807 * (lo & 0xFFFF);
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lo += (hi & 0x7FFF) << 16;
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lo += hi >> 15;
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lo = (lo & 0x7FFFFFFF) + (lo >> 31);
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n1 = signed_multiply_32x16b(gain, lo);
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hi = 16807 * (lo >> 16);
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lo = 16807 * (lo & 0xFFFF);
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lo += (hi & 0x7FFF) << 16;
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lo += hi >> 15;
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lo = (lo & 0x7FFFFFFF) + (lo >> 31);
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n2 = signed_multiply_32x16b(gain, lo);
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val1 = pack_16b_16b(n2, n1);
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*p++ = val1;
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#endif
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} while (p < end);
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seed = lo;
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//convert int16 to f32
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#define I16_TO_F32_NORM_FACTOR (3.051757812500000E-05) //which is 1/32768
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for (int i=0; i<block_f32->length; i++)
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block_f32->data[i] = (float32_t)block->data[i] * I16_TO_F32_NORM_FACTOR;
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AudioStream_F32::transmit(block_f32);
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AudioStream_F32::release(block_f32);
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AudioStream::release(block);
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//Serial.println(" Done.");
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}
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uint16_t AudioSynthNoiseWhite_F32::instance_count = 0;
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