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Player: harmonic wave form

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This commit is contained in:
Louis-Joseph Fournier 2016-01-14 16:30:58 +01:00
parent 5ccdc4f749
commit a3a7fd2506
2 changed files with 20 additions and 8 deletions
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16
src/audio/FreqPlayer.cpp
View file

@ -22,11 +22,8 @@
#include "FreqPlayer.hpp"
template<typename sample_t> FreqPlayer<sample_t>::FreqPlayer(int _rate):
freq(440),
volume(0.5),
rate(_rate),
n_frame(0),
waveform(W_TRIANGLE)
n_frame(0)
{
k = K();
k_update = -1; // invalid: don't update
@ -58,6 +55,12 @@ template<typename sample_t> void FreqPlayer<sample_t>::SetVolume(double volume)
this->volume = volume;
}
template<typename sample_t> void FreqPlayer<sample_t>::SetWaveform(WAVEFORM form, int nb_harmonics)
{
if (form == W_HARMONIC) this->nb_harmonics = nb_harmonics;
waveform = form;
}
template<> int16_t FreqPlayer<int16_t>::max() { return INT16_MAX; }
template<> double FreqPlayer<double>::max() { return 1; }
@ -70,6 +73,7 @@ template<typename sample_t> sample_t FreqPlayer<sample_t>::AudioFrame()
{
double r = radius();
double v;
int i;
switch (waveform) {
case W_SINUS:
@ -86,6 +90,10 @@ template<typename sample_t> sample_t FreqPlayer<sample_t>::AudioFrame()
v /= (M_PI / 2);
break;
case W_HARMONIC:
v = 0;
for (i = 1; i <= nb_harmonics; i++) v += sin(r * i) / i;
break;
default:
v = 0;

12
src/audio/FreqPlayer.hpp
View file

@ -27,23 +27,25 @@
template<typename sample_t> class FreqPlayer {
public:
/// waveform style
enum WAVEFORM { W_SINUS, W_TRIANGLE };
enum WAVEFORM { W_SINUS, W_TRIANGLE, W_HARMONIC };
private:
/// current frequency
double freq;
double freq = 440;
/// current volume (linear)
double volume;
double volume = 0.5;
/// audio rate
int rate;
/// current frame nb
int n_frame;
/// wave form
WAVEFORM waveform;
WAVEFORM waveform = W_HARMONIC;
/// pre computed factor
double k, k_update;
// last frame written
sample_t last_frame;
/// number of hamonics for waveforms (W_HARMONIC only)
int nb_harmonics = 5;
/// return k computed
double K() const;
@ -66,6 +68,8 @@ template<typename sample_t> class FreqPlayer {
void SetFreq(double freq);
/// set current volume
void SetVolume(double volume);
/// set waveform
void SetWaveform(WAVEFORM form, int nb_harmonics);
};
#endif