Dooho Yi
91f92c0e6c
migration from 'smp_v1p0' dev. for 'sampler' -> skip irrelavant note msg. and keep playing
132 lines
3.6 KiB
C++
132 lines
3.6 KiB
C++
/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Pete (El Supremo)
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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 and this permission notice shall be included in
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* 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 <Arduino.h>
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#include "synth_tonesweep.h"
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#include "arm_math.h"
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/******************************************************************/
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// A u d i o S y n t h T o n e S w e e p
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// Written by Pete (El Supremo) Feb 2014
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boolean AudioSynthToneSweep::play(float t_amp,int t_lo,int t_hi,float t_time)
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{
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float tone_tmp;
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if(0) {
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Serial.print("AudioSynthToneSweep.begin(tone_amp = ");
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Serial.print(t_amp);
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Serial.print(", tone_lo = ");
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Serial.print(t_lo);
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Serial.print(", tone_hi = ");
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Serial.print(t_hi);
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Serial.print(", tone_time = ");
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Serial.print(t_time,1);
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Serial.println(")");
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}
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tone_amp = 0;
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if(t_amp < 0)return false;
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if(t_amp > 1)return false;
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if(t_lo < 1)return false;
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if(t_hi < 1)return false;
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if(t_hi >= (int) AUDIO_SAMPLE_RATE_EXACT / 2)return false;
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if(t_lo >= (int) AUDIO_SAMPLE_RATE_EXACT / 2)return false;
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if(t_time <= 0)return false;
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tone_lo = t_lo;
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tone_hi = t_hi;
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tone_phase = 0;
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tone_amp = t_amp * 32767.0;
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tone_freq = tone_lo*0x100000000LL;
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if (tone_hi >= tone_lo) {
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tone_tmp = tone_hi - tone_lo;
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tone_sign = 1;
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} else {
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tone_sign = -1;
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tone_tmp = tone_lo - tone_hi;
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}
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tone_tmp = tone_tmp / t_time / AUDIO_SAMPLE_RATE_EXACT;
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tone_incr = (tone_tmp * 0x100000000LL);
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sweep_busy = 1;
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return(true);
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}
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unsigned char AudioSynthToneSweep::isPlaying(void)
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{
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return(sweep_busy);
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}
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void AudioSynthToneSweep::update(void)
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{
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audio_block_t *block;
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short *bp;
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int i;
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if(!sweep_busy)return;
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// L E F T C H A N N E L O N L Y
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block = allocate();
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if(block) {
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bp = block->data;
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uint32_t tmp = tone_freq >> 32;
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uint64_t tone_tmp = (0x400000000000LL * (int)(tmp&0x7fffffff)) / (int) AUDIO_SAMPLE_RATE_EXACT;
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// Generate the sweep
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for(i = 0;i < AUDIO_BLOCK_SAMPLES;i++) {
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*bp++ = (short)(( (short)(arm_sin_q31((uint32_t)((tone_phase >> 15)&0x7fffffff))>>16) *tone_amp) >> 15);
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tone_phase += tone_tmp;
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if(tone_phase & 0x800000000000LL)tone_phase &= 0x7fffffffffffLL;
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if(tone_sign > 0) {
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if(tmp > tone_hi) {
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sweep_busy = 0;
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break;
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}
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tone_freq += tone_incr;
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} else {
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if(tmp < tone_hi || tone_freq < tone_incr) {
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sweep_busy = 0;
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break;
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}
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tone_freq -= tone_incr;
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}
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}
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while(i < AUDIO_BLOCK_SAMPLES) {
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*bp++ = 0;
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i++;
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}
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// send the samples to the left channel
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transmit(block,0);
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release(block);
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}
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}
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