switch-examples/audio/sdl2-audio/source/main.c

// Include the most common headers from the C standard library
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Include the main libnx system header, for Switch development
#include <switch.h>

// Include sdl2 headers
#include <SDL2/SDL.h>
#include <SDL2/SDL_mixer.h>

// Main program entrypoint
int main(int argc, char* argv[])
{
    // This example uses sdl2 library to play a mp3 file
	
    consoleInit(NULL);

    printf("Press A button to play the sound!\n");

    // Start SDL with audio support
    SDL_Init(SDL_INIT_AUDIO);
	 
    // Load support for the MP3 format 
    Mix_Init(MIX_INIT_MP3);
	 
    // open 44.1KHz, signed 16bit, system byte order,
    //  stereo audio, using 4096 byte chunks
    Mix_OpenAudio(44100, MIX_DEFAULT_FORMAT, MIX_DEFAULT_CHANNELS, 4096);
	
    // Load sound file to use
    Mix_Music *audio = Mix_LoadMUS("test.mp3");
	 
    // Main loop
    while (appletMainLoop())
    {
        // Scan all the inputs. This should be done once for each frame
        hidScanInput();

        // hidKeysDown returns information about which buttons have been
        // just pressed in this frame compared to the previous one
        u64 kDown = hidKeysDown(CONTROLLER_P1_AUTO);

        if (kDown & KEY_PLUS)
            break; // break in order to return to hbmenu

        if (kDown & KEY_A){
	    Mix_PlayMusic(audio, 1); //Play the audio file
	    }
		
        // Update the console, sending a new frame to the display
        consoleUpdate(NULL);
    }

    // Free the loaded sound
    Mix_FreeMusic(audio);
	
    // Shuts down SDL subsystems
    SDL_Quit();
	
    // Deinitialize and clean up resources used by the console (important!)
    consoleExit(NULL);
    return 0;
}