main.cpp

Example code for starting a Hardt-based project

/*
    A very basic template for starting a new Hardt-based project
 
    Dont forget to install PortAudio 'sudo apt install libportaudio2'
 
    Run these commands to build and run:
    '''
        cmake .
        make
        ./MyHardtApp
    '''
*/
 
#include <iostream>
#include <signal.h>
 
#include "hardtapi.h"
 
// Output sound device. If you do not know the device id
// use 'dspcmd -c' to get a list of available portaudio devices
#define SOUND_DEVICE 0
 
#define FREQUENCY    1000
#define AMPLITUDE    20000
 
#define BLOCKSIZE    1024
#define RATE         H_SAMPLE_RATE_48K
#define FORMAT       H_SAMPLE_FORMAT_INT_16
 
bool terminated = false;
 
static void signalIntTermHandler (int signal_value)
{
    terminated = true;
}
 
void InstallSignalHandler() {
    struct sigaction action;
    action.sa_handler = [](int) { terminated = true; };
    action.sa_flags = 0;
    sigemptyset (&action.sa_mask);
    sigaction (SIGINT, &action, NULL);
    sigaction (SIGTERM, &action, NULL);
}
 
int main(int argc, char** argv) {
 
    // Install signalhandler to catch ctrl+c to quit
    InstallSignalHandler();
 
    // Initialize the Hardt toolkit with debugging disabled
    HInit(std::string("readers_and_writers"), false);
 
    // Show application name and and Hardt version.
    std::cout << APPNAME << ": using Hardt " + getVersion() << std::endl;
 
    // (try to) Catch all exceptions
    try {
 
        // Create a sinus generator running at 1KHz and peak amplitude 20.000
        HSineGenerator<int16_t> generator(RATE, FREQUENCY, AMPLITUDE);
 
        // Create a processor
        HStreamProcessor<int16_t> processor(generator.Reader(), BLOCKSIZE, &terminated);
 
        // Create a soundcard writer, to output the 1KHz signal to the selected sound device
        HSoundcardWriter<int16_t> soundcard(SOUND_DEVICE, RATE, 1, FORMAT, BLOCKSIZE, processor.Consumer());
 
        // Start the processor and run untill terminated
        std::cout << "Running. Press CTRL+C to quit\n";
        processor.Run();
    }
    catch( HAudioIOException *ex ) {
        std::cout << "HAudioIOException: " << ex->what() << "\n";
    }
    catch( HException *hex ) {
        std::cout << hex->type() << ": " << hex->what() << "\n";
    }
    catch( ... ) {
        std::cout << "Unknown exception type caught\n";
    }
 
    // Finished
    return 0;
}