SDL_OpenAudioDevice() C++ example

sdl_openaudiodevice.cpp

#include <chrono>
#include <iostream>
#include <thread>
#include <SDL2/SDL.h>

void callback( void *, Uint8 * stream, int len )
{
    memset( stream, 0, len );
}

int main()
{
    if( SDL_Init( SDL_INIT_AUDIO ) != 0 )
    {
        std::cerr << "SDL_Init(): " << SDL_GetError() << std::endl;
        SDL_ClearError();
        return 1;
    }

    SDL_AudioSpec specs = {};
    specs.freq = 48000;
    specs.format = AUDIO_S32;
    specs.channels = 2;
    specs.samples = 4096;
    specs.callback = callback;

    constexpr int PLAYBACK_DEV = 0;

    const int audio_dev_id = SDL_OpenAudioDevice( nullptr, PLAYBACK_DEV, &specs,
        nullptr, SDL_AUDIO_ALLOW_CHANNELS_CHANGE );

    if( audio_dev_id == 0 )
    {
        std::cerr << "Error opening audio device: " << SDL_GetError() << std::endl;
        return 1;
    }

    while( true )
    {
        std::this_thread::sleep_for( std::chrono::seconds( 5 ) );
    }
}