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170 lines
6.3 KiB
170 lines
6.3 KiB
/*
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Extended to f32 data
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Created: Chip Audette, OpenAudio, Feb 2017
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Included I16 to F32 conversion here. Bob Larkin 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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// http://stenzel.waldorfmusic.de/post/pink/
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// https://github.com/Stenzel/newshadeofpink
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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// New Shade of Pink
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// (c) 2014 Stefan Stenzel
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// stefan at waldorfmusic.de
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//
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// Terms of use:
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// Use for any purpose. If used in a commercial product, you should give me one.
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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#include "synth_pinknoise_f32.h"
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int16_t AudioSynthNoisePink_F32::instance_cnt = 0;
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// Let preprocessor and compiler calculate two lookup tables for 12-tap FIR Filter
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// with these coefficients: 1.190566, 0.162580, 0.002208, 0.025475, -0.001522,
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// 0.007322, 0.001774, 0.004529, -0.001561, 0.000776, -0.000486, 0.002017
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#define Fn(cf,m,shift) (2048*cf*(2*((m)>>shift&1)-1))
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#define FA(n) (int32_t)(Fn(1.190566,n,0)+Fn(0.162580,n,1)+Fn(0.002208,n,2)+\
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Fn(0.025475,n,3)+Fn(-0.001522,n,4)+Fn(0.007322,n,5))
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#define FB(n) (int32_t)(Fn(0.001774,n,0)+Fn(0.004529,n,1)+Fn(-0.001561,n,2)+\
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Fn(0.000776,n,3)+Fn(-0.000486,n,4)+Fn(0.002017,n,5))
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#define FA8(n) FA(n),FA(n+1),FA(n+2),FA(n+3),FA(n+4),FA(n+5),FA(n+6),FA(n+7)
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#define FB8(n) FB(n),FB(n+1),FB(n+2),FB(n+3),FB(n+4),FB(n+5),FB(n+6),FB(n+7)
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const int32_t AudioSynthNoisePink_F32::pfira[64] = // 1st FIR lookup table
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{FA8(0),FA8(8),FA8(16),FA8(24),FA8(32),FA8(40),FA8(48),FA8(56)};
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const int32_t AudioSynthNoisePink_F32::pfirb[64] = // 2nd FIR lookup table
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{FB8(0),FB8(8),FB8(16),FB8(24),FB8(32),FB8(40),FB8(48),FB8(56)};
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// bitreversed lookup table
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#define PM16(n) n,0x80,0x40,0x80,0x20,0x80,0x40,0x80,0x10,0x80,0x40,0x80,0x20,0x80,0x40,0x80
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const uint8_t AudioSynthNoisePink_F32::pnmask[256] = {
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PM16(0),PM16(8),PM16(4),PM16(8),PM16(2),PM16(8),PM16(4),PM16(8),
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PM16(1),PM16(8),PM16(4),PM16(8),PM16(2),PM16(8),PM16(4),PM16(8)
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};
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#define PINT(bitmask, out) /* macro for processing: */\
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bit = lfsr >> 31; /* spill random to all bits */\
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dec &= ~bitmask; /* blank old decrement bit */\
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lfsr <<= 1; /* shift lfsr */\
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dec |= inc & bitmask; /* copy increment to decrement bit */\
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inc ^= bit & bitmask; /* new random bit */\
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accu += inc - dec; /* integrate */\
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lfsr ^= bit & taps; /* update lfsr */\
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out = accu + /* save output */\
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pfira[lfsr & 0x3F] + /* add 1st half precalculated FIR */\
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pfirb[lfsr >> 6 & 0x3F] /* add 2nd half, also correts bias */
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void AudioSynthNoisePink_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;
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int32_t gain;
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int32_t inc, dec, accu, bit, lfsr;
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int32_t taps;
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if (!enabled) return;
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gain = level;
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if (gain == 0) return;
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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) return;
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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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taps = 0x46000001;
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inc = pinc;
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dec = pdec;
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accu = paccu;
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lfsr = plfsr;
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do {
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int32_t mask = pnmask[pncnt++];
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PINT(mask, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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PINT(0x0400, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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PINT(0x0200, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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PINT(0x0400, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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PINT(0x0100, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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PINT(0x0400, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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PINT(0x0200, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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PINT(0x0400, n1);
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n1 = signed_multiply_32x16b(gain, n1);
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PINT(0x0800, n2);
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n2 = signed_multiply_32x16b(gain, n2);
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*p++ = pack_16b_16b(n2, n1);
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} while (p < end);
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pinc = inc;
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pdec = dec;
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paccu = accu;
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plfsr = lfsr;
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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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}
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