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/*
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Extended to f32 data |
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Created: 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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// 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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#include "input_i2s_f32.h" //for the audio_convert_i16_to_f32 routine |
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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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AudioInputI2S_F32::convert_i16_to_f32(block->data,block_f32->data,block_f32->length); |
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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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@ -0,0 +1,75 @@ |
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/*
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Extended to f32 data |
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Created: 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_pinknoise_f32_h_ |
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#define synth_pinknoise_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 AudioSynthNoisePink_F32 : public AudioStream_F32 |
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{ |
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//GUI: inputs:0, outputs:1 //this line used for automatic generation of GUI node
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//GUI: shortName:pinknoise //this line used for automatic generation of GUI node
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public: |
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AudioSynthNoisePink_F32() : AudioStream_F32(0, NULL) { |
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plfsr = 0x5EED41F5 + instance_cnt++; |
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paccu = 0; |
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pncnt = 0; |
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pinc = 0x0CCC; |
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pdec = 0x0CCC; |
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enabled = 1; |
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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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int enabled = 0; |
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private: |
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static const uint8_t pnmask[256]; |
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static const int32_t pfira[64]; |
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static const int32_t pfirb[64]; |
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static int16_t instance_cnt; |
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int32_t plfsr; // linear feedback shift register
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int32_t pinc; // increment for all noise sources (bits)
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int32_t pdec; // decrement for all noise sources
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int32_t paccu; // accumulator
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uint8_t pncnt; // overflowing counter as index to pnmask[]
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int32_t level; // 0=off, 65536=max
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}; |
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#endif |
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