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openal beep with volume
#include <AL/alut.h> // OpenAl
#include <cmath>
#include <iostream>
#include <thread>
using namespace std;
void init_al() {
const char* defname = alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);
ALCdevice* dev = alcOpenDevice(defname);
ALCcontext* ctx = alcCreateContext(dev, NULL);
alcMakeContextCurrent(ctx);
}
void exit_al() {
ALCcontext* ctx = alcGetCurrentContext();
ALCdevice* dev = alcGetContextsDevice(ctx);
alcMakeContextCurrent(0);
alcDestroyContext(ctx);
alcCloseDevice(dev);
}
void Beep(float freq = 440, float volume = 1.0, float seconds = 0.5) {
ALuint buf;
alGenBuffers(1, &buf);
unsigned sample_rate = 10000;
size_t buf_size = seconds * sample_rate;
short* samples = new short[buf_size];
if (samples == 0) {
cout << "It seems there is no more heap memory. Sorry we cannot make a beep!";
}
for (unsigned i = 0; i < buf_size; i++)
samples[i] = volume * 32760 * sin(2 * M_PI * i * freq / sample_rate);
alBufferData(buf, AL_FORMAT_MONO16, samples, buf_size, sample_rate);
ALuint src;
alGenSources(1, &src);
alSourcei(src, AL_BUFFER, buf);
alSourcePlay(src);
alutSleep(seconds + 0.5);
delete[] samples;
alSourceStopv(1, &src); // new line
alDeleteSources(1, &src); // new line
alDeleteBuffers(1, &buf); // new line
}
int main() {
init_al();
Beep(440, 1.0, 0.5);
Beep(440, 0.8, 0.5);
Beep(440, 0.6, 0.5);
Beep(440, 0.4, 0.5);
Beep(540, 0.2, 0.1);
Beep(740, 1.0, 0.2);
Beep(840, 1.0, 0.3);
Beep(940, 1.0, 0.5);
exit_al();
}
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