/*

  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied

  warranty.  In no event will the authors be held liable for any damages

  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely.

*/

#include "SDL.h"

#ifdef __EMSCRIPTEN__

#include <emscripten/emscripten.h>

#endif

static SDL_Window *window = NULL;

static SDL_Renderer *renderer = NULL;

static SDL_AudioSpec spec;

void SDLCALL

capture_callback(void *arg, Uint8 * stream, int len)

{

}

static void

loop()

{

    SDL_Event e;

    while (SDL_PollEvent(&e)) {

        if (e.type == SDL_QUIT) {

            please_quit = SDL_TRUE;

        }

    }

        SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);

    } else {

        SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);

    }

    SDL_RenderClear(renderer);

    SDL_RenderPresent(renderer);

    if (please_quit) {

        /* stop playing back, quit. */

        SDL_Log("Shutting down.\n");

        SDL_Quit();

        #ifdef __EMSCRIPTEN__

        emscripten_cancel_main_loop();

        #endif

        exit(0);

    }

}

int

main(int argc, char **argv)

{

    /* (argv[1] == NULL means "open default device.") */

    const char *devname = argv[1];

    int devcount;

    int i;

    /* Enable standard application logging */

    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Load the SDL library */

    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {

        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());

        return (1);

    }

    window = SDL_CreateWindow("testaudiocapture", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, SDL_WINDOW_FULLSCREEN_DESKTOP);

    renderer = SDL_CreateRenderer(window, -1, 0);

    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);

    SDL_RenderClear(renderer);

    SDL_RenderPresent(renderer);

    SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());

    devcount = SDL_GetNumAudioDevices(SDL_TRUE);

    for (i = 0; i < devcount; i++) {

        SDL_Log(" Capture device #%d: '%s'\n", i, SDL_GetAudioDeviceName(i, SDL_TRUE));

    }

    SDL_zero(spec);

    spec.freq = 44100;

    spec.format = AUDIO_F32SYS;

    spec.channels = 1;

    spec.samples = 1024;

    spec.callback = capture_callback;

            devname ? "'" : "",

            devname ? devname : "[[default]]",

            devname ? "'" : "");

        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for capture: %s!\n", SDL_GetError());

        SDL_Quit();

        exit(1);

    }

#ifdef __EMSCRIPTEN__

    emscripten_set_main_loop(loop, 0, 1);

#else

    while (1) { loop(); SDL_Delay(16); }

#endif

    return 0;

}