Software » Campo » Biwak

#include <pulse/simple.h>

#include <pulse/error.h>

#include <cmath>

#include <thread>

#include <atomic>

#include <iostream>

std::atomic<bool> running{true};

float gfreq=440;

void playTone(float freq, float durationSec) {

    const int sample_rate = 44100;

    pa_sample_spec ss;

    ss.format = PA_SAMPLE_FLOAT32LE;

    ss.rate = sample_rate;

    ss.channels = 1;

    int error;

    pa_simple *s = pa_simple_new(

        nullptr,

        "ToneGenerator",

        PA_STREAM_PLAYBACK,

        nullptr,

        "Playback",

        &ss,

        nullptr, nullptr,

        &error

    );

    if (!s) {

        std::cerr << "PulseAudio error: " << pa_strerror(error) << "\n";

        return;

    }

    int total_samples = durationSec * sample_rate;

    for (int i = 0; i < total_samples && running; i++) {

        float sample = sinf(2.0f * M_PI * gfreq * i / sample_rate);

        if (pa_simple_write(s, &sample, sizeof(sample), &error) < 0) {

            std::cerr << "pa_simple_write() failed: " << pa_strerror(error) << "\n";

            break;

        }

    }

    pa_simple_drain(s, &error);

    pa_simple_free(s);

}

int main() {

    std::cout << "Starting tone in background...\n";

    std::thread t([](){

        playTone(440.0f, 5.0f);   // 5 seconds in background

    });

    // Main program continues running

    std::cout << "Main program is free to do other work...\n";

    // Simulate work

    //std::this_thread::sleep_for(std::chrono::seconds(2));

    //std::cout << "Still running...\n";

    for(int i1=0; i1<10; i1++)

    {

      usleep(1000000/2);

      gfreq+=100;

    }

    t.join();

    std::cout << "Tone finished.\n";

}