src/Misc/Time.h

   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             :frames(0),
  23             s(synth){};
  24         void operator++(){++frames;};
  25         void operator++(int){frames++;};
  26         int64_t time() const {return frames;};
  27         unsigned int tempo;
  28         float dt() const { return s.dt(); }
  29         float framesPerSec() const { return 1/s.dt();}
  30         int   samplesPerFrame() const {return s.buffersize;}
  31     private:
  32         int64_t frames;
  33         const SYNTH_T &s;
  34
  35 };
  36
  37 //Marker for an event relative to some position of the absolute timer
  38 class RelTime
  39 {
  40     public:
  41         RelTime(const AbsTime &t_, float sec)
  42             :t(t_)
  43         {
  44             //Calculate time of event
  45             float deltaFrames = sec*t.framesPerSec();
  46             int64_t tmp = (int64_t)deltaFrames;
  47             frame = t.time() + tmp;
  48             sample = (int32_t)(t.samplesPerFrame()*(deltaFrames-tmp));
  49         }
  50         bool inThisFrame() {return t.time() == frame;};
  51         bool inPast() {return t.time() > frame;}
  52         bool inFuture() {return t.time() < frame;}
  53     private:
  54         int64_t frame;
  55         int32_t sample;
  56         const AbsTime &t;
  57 };
  58
  59 }