testaudiocapture.c File Reference

#include "SDL.h"
#include <stdlib.h>

Include dependency graph for testaudiocapture.c:

Go to the source code of this file.

Functions
static void	loop ()
int	main (int argc, char **argv)

Variables
static SDL_Window *	window = NULL
static SDL_Renderer *	renderer = NULL
static SDL_AudioSpec	spec
static SDL_AudioDeviceID	devid_in = 0
static SDL_AudioDeviceID	devid_out = 0

Function Documentation

static void loop ( )

static

Definition at line 27 of file testaudiocapture.c.

References SDL_MouseButtonEvent::button, SDL_Event::button, devid_in, devid_out, e, SDL_Event::key, SDL_KeyboardEvent::keysym, SDL_AUDIO_PLAYING, SDL_CloseAudioDevice, SDL_DequeueAudio, SDL_DestroyRenderer, SDL_DestroyWindow, SDL_FALSE, SDL_GetAudioDeviceStatus, SDL_KEYDOWN, SDL_Log, SDL_MOUSEBUTTONDOWN, SDL_MOUSEBUTTONUP, SDL_PauseAudioDevice, SDL_PollEvent, SDL_QueueAudio, SDL_Quit, SDL_QUIT, SDL_RenderClear, SDL_RenderPresent, SDL_SetRenderDrawColor, SDL_TRUE, SDLK_ESCAPE, SDL_Keysym::sym, and SDL_Event::type.

{
    SDL_bool please_quit = SDL_FALSE;
    SDL_Event e;

    while (SDL_PollEvent(&e)) {
        if (e.type == SDL_QUIT) {
            please_quit = SDL_TRUE;
        } else if (e.type == SDL_KEYDOWN) {
            if (e.key.keysym.sym == SDLK_ESCAPE) {
                please_quit = SDL_TRUE;
            }
        } else if (e.type == SDL_MOUSEBUTTONDOWN) {
            if (e.button.button == 1) {
                SDL_PauseAudioDevice(devid_out, SDL_TRUE);
                SDL_PauseAudioDevice(devid_in, SDL_FALSE);
            }
        } else if (e.type == SDL_MOUSEBUTTONUP) {
            if (e.button.button == 1) {
                SDL_PauseAudioDevice(devid_in, SDL_TRUE);
                SDL_PauseAudioDevice(devid_out, SDL_FALSE);
            }
        }
    }

    if (SDL_GetAudioDeviceStatus(devid_in) == SDL_AUDIO_PLAYING) {
        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_PauseAudioDevice(devid_in, 1);
        SDL_CloseAudioDevice(devid_in);
        SDL_PauseAudioDevice(devid_out, 1);
        SDL_CloseAudioDevice(devid_out);
        SDL_DestroyRenderer(renderer);
        SDL_DestroyWindow(window);
        SDL_Quit();
        #ifdef __EMSCRIPTEN__
        emscripten_cancel_main_loop();
        #endif
        exit(0);
    }

    /* Note that it would be easier to just have a one-line function that
        calls SDL_QueueAudio() as a capture device callback, but we're
        trying to test the API, so we use SDL_DequeueAudio() here. */
    while (SDL_TRUE) {
        Uint8 buf[1024];
        const Uint32 br = SDL_DequeueAudio(devid_in, buf, sizeof (buf));
        SDL_QueueAudio(devid_out, buf, br);
        if (br < sizeof (buf)) {
            break;
        }
    }
}

int main	(	int	argc,
		char **	argv
	)

Definition at line 90 of file testaudiocapture.c.

References AUDIO_F32SYS, SDL_AudioSpec::callback, SDL_AudioSpec::channels, devid_in, devid_out, SDL_AudioSpec::format, SDL_AudioSpec::freq, i, loop(), NULL, SDL_AudioSpec::samples, SDL_AUDIO_ALLOW_ANY_CHANGE, SDL_CreateRenderer, SDL_CreateWindow, SDL_Delay, SDL_FALSE, SDL_GetAudioDeviceName, SDL_GetCurrentAudioDriver, SDL_GetError, SDL_GetNumAudioDevices, SDL_Init, SDL_INIT_AUDIO, SDL_INIT_VIDEO, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_OpenAudioDevice, SDL_Quit, SDL_RenderClear, SDL_RenderPresent, SDL_SetRenderDrawColor, SDL_TRUE, SDL_WINDOWPOS_CENTERED, and SDL_zero.

{
    /* (argv[1] == NULL means "open default device.") */
    const char *devname = argv[1];
    SDL_AudioSpec wanted;
    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, 0);
    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(wanted);
    wanted.freq = 44100;
    wanted.format = AUDIO_F32SYS;
    wanted.channels = 1;
    wanted.samples = 4096;
    wanted.callback = NULL;

    SDL_zero(spec);

    /* DirectSound can fail in some instances if you open the same hardware
       for both capture and output and didn't open the output end first,
       according to the docs, so if you're doing something like this, always
       open your capture devices second in case you land in those bizarre
       circumstances. */

    SDL_Log("Opening default playback device...\n");
    devid_out = SDL_OpenAudioDevice(NULL, SDL_FALSE, &wanted, &spec, SDL_AUDIO_ALLOW_ANY_CHANGE);
    if (!devid_out) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for playback: %s!\n", SDL_GetError());
        SDL_Quit();
        exit(1);
    }

    SDL_Log("Opening capture device %s%s%s...\n",
            devname ? "'" : "",
            devname ? devname : "[[default]]",
            devname ? "'" : "");

    devid_in = SDL_OpenAudioDevice(argv[1], SDL_TRUE, &spec, &spec, 0);
    if (!devid_in) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open an audio device for capture: %s!\n", SDL_GetError());
        SDL_Quit();
        exit(1);
    }

    SDL_Log("Ready! Hold down mouse or finger to record!\n");

#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (1) { loop(); SDL_Delay(16); }
#endif

    return 0;
}

Variable Documentation

SDL_AudioDeviceID devid_in = 0

static

Definition at line 23 of file testaudiocapture.c.

Referenced by loop(), and main().

SDL_AudioDeviceID devid_out = 0

static

Definition at line 24 of file testaudiocapture.c.

Referenced by loop(), and main().

SDL_Renderer* renderer = NULL

static

Definition at line 21 of file testaudiocapture.c.

Referenced by _Redraw(), LoadSprite(), loop(), main(), Redraw(), SDL_CreateRenderer(), SDL_CreateSoftwareRenderer(), SDL_CreateTexture(), SDL_CreateWindowTexture(), SDL_DestroyTexture(), SDL_GL_BindTexture(), SDL_GL_UnbindTexture(), SDL_LockTexture(), SDL_RendererEventWatch(), SDL_SetTextureAlphaMod(), SDL_SetTextureBlendMode(), SDL_SetTextureColorMod(), SDL_UnlockTexture(), SDL_UpdateTexture(), SDL_UpdateYUVTexture(), SW_CreateRendererForSurface(), unifont_cleanup(), and unifont_load_texture().

SDL_AudioSpec spec

static

Definition at line 22 of file testaudiocapture.c.

SDL_Window* window = NULL

static

Definition at line 20 of file testaudiocapture.c.