Olivier Smeesters / SoundWaveGenerator

Classes to produce a computed sound wave on the analog output.

Dependents:   SoundWaveGeneratorTest SoundWaveGeneratorTest

WaveCombo.cpp@0:ed89ef772e92, 2011-01-24 (annotated)

Committer:
osmeest
Date:
Mon Jan 24 22:44:39 2011 +0000
Revision:
0:ed89ef772e92
Initial release.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
osmeest 0:ed89ef772e92 1 #include "snd_wave_generator/WaveCombo.h"
osmeest 0:ed89ef772e92 2
osmeest 0:ed89ef772e92 3 #include <algorithm>
osmeest 0:ed89ef772e92 4 #include <functional>
osmeest 0:ed89ef772e92 5 #include <numeric>
osmeest 0:ed89ef772e92 6
osmeest 0:ed89ef772e92 7 namespace snd_wave_generator {
osmeest 0:ed89ef772e92 8
osmeest 0:ed89ef772e92 9 WaveCombo & WaveCombo::add(Wave *wave) {
osmeest 0:ed89ef772e92 10 if (wave) {
osmeest 0:ed89ef772e92 11 this->waves.push_back(wave);
osmeest 0:ed89ef772e92 12 this->numWaves = this->waves.size();
osmeest 0:ed89ef772e92 13 }
osmeest 0:ed89ef772e92 14
osmeest 0:ed89ef772e92 15 return *this;
osmeest 0:ed89ef772e92 16 }
osmeest 0:ed89ef772e92 17
osmeest 0:ed89ef772e92 18 void WaveCombo::prepare(std::size_t sampleRate)
osmeest 0:ed89ef772e92 19 {
osmeest 0:ed89ef772e92 20 std::for_each(this->waves.begin(), this->waves.end(),
osmeest 0:ed89ef772e92 21 std::bind2nd(std::mem_fun(&Wave::prepare), sampleRate));
osmeest 0:ed89ef772e92 22 }
osmeest 0:ed89ef772e92 23
osmeest 0:ed89ef772e92 24 struct AccumulateWaveValueAt {
osmeest 0:ed89ef772e92 25 AccumulateWaveValueAt(std::size_t pos) : pos(pos) { }
osmeest 0:ed89ef772e92 26 float operator()(float acc, const Wave *wave) const {
osmeest 0:ed89ef772e92 27 return acc + wave->read(this->pos);
osmeest 0:ed89ef772e92 28 }
osmeest 0:ed89ef772e92 29
osmeest 0:ed89ef772e92 30 std::size_t pos;
osmeest 0:ed89ef772e92 31 };
osmeest 0:ed89ef772e92 32
osmeest 0:ed89ef772e92 33 float WaveCombo::read(std::size_t pos) const {
osmeest 0:ed89ef772e92 34 float v = std::accumulate(this->waves.begin(), this->waves.end(), 0.0f,
osmeest 0:ed89ef772e92 35 AccumulateWaveValueAt(pos));
osmeest 0:ed89ef772e92 36
osmeest 0:ed89ef772e92 37 return v / this->numWaves;
osmeest 0:ed89ef772e92 38 }
osmeest 0:ed89ef772e92 39
osmeest 0:ed89ef772e92 40 } // snd_wave_generator