131 lines
2.6 KiB
C++
131 lines
2.6 KiB
C++
/*
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* Author: Harry van Haaren 2013
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* harryhaaren@gmail.com
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "metronome.hxx"
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#include <cmath>
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#include <iostream>
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#include "jack.hxx"
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#include "buffers.hxx"
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#include "observer/time.hxx"
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extern Jack* jack;
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using namespace std;
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Metronome::Metronome() :
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TimeObserver(),
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playBar (false),
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active (false),
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playPoint (0)
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{
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const uint32_t sr = jack->getSamplerate();
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const uint32_t bipDuration = (sr / 10);
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//Create Beat/Bar samples
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beatSample=new float[bipDuration];
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barSample=new float[bipDuration];
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// create beat and bar samples
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endPoint = bipDuration;
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// samples per cycle of
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float scale = 2 * 3.1415 *880 / sr;
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// And fill it up
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for(int i=0; i < bipDuration; i++) {
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beatSample[i]= sin(i*scale);
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barSample [i]= sin(i*scale*2);
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}
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uint32_t fade_smps = (bipDuration / 10.f);
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for(int i = 0; i < fade_smps; i++) {
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float f = (i / (float)fade_smps);
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f = (f * f * f);
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beatSample[i] *= f;
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barSample [i] *= f;
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beatSample[bipDuration-1-i] *= f;
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barSample [bipDuration-1-i] *= f;
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}
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setVolume(0.5);
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// don't play after creation
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playPoint = endPoint + 1;
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}
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Metronome::~Metronome()
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{
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if(beatSample)
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delete [] beatSample;
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if(barSample)
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delete [] barSample;
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}
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void Metronome::setActive(bool a)
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{
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active = a;
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// don't play immidiatly
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playPoint = endPoint + 1;
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}
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void Metronome::setVolume( float v )
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{
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vol = v * 0.5;
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//printf(" vol = %f \n", vol );
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}
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void Metronome::bar()
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{
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playPoint = 0;
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playBar = true;
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}
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void Metronome::beat()
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{
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playPoint = 0;
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playBar = false;
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}
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void Metronome::setFpb(double f)
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{
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fpb = f;
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}
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void Metronome::process(int nframes, Buffers* buffers)
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{
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if ( not active )
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return;
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float* outL = buffers->audio[Buffers::HEADPHONES_OUT_L];
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float* outR = buffers->audio[Buffers::HEADPHONES_OUT_R];
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float* sample = &beatSample[0];
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if( playBar ) {
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sample = &barSample[0];
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}
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for(int i = 0; i < nframes; i++) {
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if ( playPoint < endPoint ) {
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outL[i] += sample[playPoint] * vol;
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outR[i] += sample[playPoint] * vol;
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playPoint++;
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}
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}
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}
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