zynaddsubfx

ZynAddSubFX open source synthesizer
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Time.h (2028B)

      1 /*
      2   ZynAddSubFX - a software synthesizer
      3 
      4   Time.h - Frame Tracker
      5   Copyright (C) 2016 Mark McCurry
      6 
      7   This program is free software; you can redistribute it and/or
      8   modify it under the terms of the GNU General Public License
      9   as published by the Free Software Foundation; either version 2
     10   of the License, or (at your option) any later version.
     11 */
     12 #pragma once
     13 #include <stdint.h>
     14 #include "../globals.h"
     15 
     16 namespace zyn {
     17 
     18 class AbsTime
     19 {
     20     public:
     21         AbsTime(const SYNTH_T &synth)
     22             :tempo(120),
     23             hostSamples(0),
     24             bar(0),
     25             beat(0),
     26             tick(0.0f),
     27             bpm(120.0f),
     28             ppq(1920.0f),
     29             frames(0),
     30             s(synth) {};
     31         void operator++(){++frames;};
     32         void operator++(int){frames++;};
     33         int64_t time() const {return frames;};
     34         unsigned int tempo;
     35         int hostSamples;
     36         int bar;
     37         int beat;
     38         float tick;
     39         float beatsPerBar;
     40         float beatType;
     41         float bpm;
     42         float ppq;
     43         bool playing;
     44         float dt() const { return s.dt(); }
     45         float framesPerSec() const { return 1/s.dt();}
     46         int   samplesPerFrame() const {return s.buffersize;}
     47         int   samplerate() const {return s.buffersize / s.dt();}
     48     private:
     49         int64_t frames;
     50         const SYNTH_T &s;
     51 
     52 };
     53 
     54 //Marker for an event relative to some position of the absolute timer
     55 class RelTime
     56 {
     57     public:
     58         RelTime(const AbsTime &t_, float sec)
     59             :t(t_)
     60         {
     61             //Calculate time of event
     62             float deltaFrames = sec*t.framesPerSec();
     63             int64_t tmp = (int64_t)deltaFrames;
     64             frame = t.time() + tmp;
     65             sample = (int32_t)(t.samplesPerFrame()*(deltaFrames-tmp));
     66         }
     67         bool inThisFrame() {return t.time() == frame;};
     68         bool inPast() {return t.time() > frame;}
     69         bool inFuture() {return t.time() < frame;}
     70     private:
     71         int64_t frame;
     72         int32_t sample;
     73         const AbsTime &t;
     74 };
     75 
     76 }