loopwavequeue.c File Reference

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

Include dependency graph for loopwavequeue.c:

Go to the source code of this file.

Functions
static void	quit (int rc)
void	poked (int sig)
void	loop ()
int	main (int argc, char *argv[])

Variables
struct {
SDL_AudioSpec   spec
Uint8 *   sound
Uint32   soundlen
}	wave
static int	done = 0

Function Documentation

void loop

(

)

Definition at line 52 of file loopwavequeue.c.

References done, SDL_AUDIO_PLAYING, SDL_GetAudioStatus, SDL_GetError, SDL_GetQueuedAudioSize, SDL_Log, SDL_QueueAudio, and wave.

{
#ifdef __EMSCRIPTEN__
    if (done || (SDL_GetAudioStatus() != SDL_AUDIO_PLAYING)) {
        emscripten_cancel_main_loop();
    }
    else
#endif
    {
        /* The device from SDL_OpenAudio() is always device #1. */
        const Uint32 queued = SDL_GetQueuedAudioSize(1);
        SDL_Log("Device has %u bytes queued.\n", (unsigned int) queued);
        if (queued <= 8192) {  /* time to requeue the whole thing? */
            if (SDL_QueueAudio(1, wave.sound, wave.soundlen) == 0) {
                SDL_Log("Device queued %u more bytes.\n", (unsigned int) wave.soundlen);
            } else {
                SDL_Log("Device FAILED to queue %u more bytes: %s\n", (unsigned int) wave.soundlen, SDL_GetError());
            }
        }
    }
}

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 75 of file loopwavequeue.c.

References done, sort_controllers::filename, loop(), NULL, poked(), quit(), SDL_AUDIO_PLAYING, SDL_CloseAudio, SDL_Delay, SDL_FreeWAV, SDL_GetAudioStatus, SDL_GetError, SDL_Init, SDL_INIT_AUDIO, SDL_LoadWAV, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_OpenAudio, SDL_PauseAudio, SDL_Quit, SDL_strlcpy, and wave.

{
    char filename[4096];

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Load the SDL library */
    if (SDL_Init(SDL_INIT_AUDIO) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return (1);
    }

    if (argc > 1) {
        SDL_strlcpy(filename, argv[1], sizeof(filename));
    } else {
        SDL_strlcpy(filename, "sample.wav", sizeof(filename));
    }
    /* Load the wave file into memory */
    if (SDL_LoadWAV(filename, &wave.spec, &wave.sound, &wave.soundlen) == NULL) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", filename, SDL_GetError());
        quit(1);
    }

    wave.spec.callback = NULL;  /* we'll push audio. */

#if HAVE_SIGNAL_H
    /* Set the signals */
#ifdef SIGHUP
    signal(SIGHUP, poked);
#endif
    signal(SIGINT, poked);
#ifdef SIGQUIT
    signal(SIGQUIT, poked);
#endif
    signal(SIGTERM, poked);
#endif /* HAVE_SIGNAL_H */

    /* Initialize fillerup() variables */
    if (SDL_OpenAudio(&wave.spec, NULL) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open audio: %s\n", SDL_GetError());
        SDL_FreeWAV(wave.sound);
        quit(2);
    }

    /*static x[99999]; SDL_QueueAudio(1, x, sizeof (x));*/

    /* Let the audio run */
    SDL_PauseAudio(0);

    done = 0;

    /* Note that we stuff the entire audio buffer into the queue in one
       shot. Most apps would want to feed it a little at a time, as it
       plays, but we're going for simplicity here. */
    
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    while (!done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING))
    {
        loop();

        SDL_Delay(100);  /* let it play for awhile. */
    }
#endif

    /* Clean up on signal */
    SDL_CloseAudio();
    SDL_FreeWAV(wave.sound);
    SDL_Quit();
    return 0;
}

void poked

(

int

sig

)

Definition at line 46 of file loopwavequeue.c.

References done.

Referenced by main().

{
    done = 1;
}

static void quit ( int  rc )

static

Definition at line 38 of file loopwavequeue.c.

References SDL_Quit.

{
    SDL_Quit();
    exit(rc);
}

Variable Documentation

int done = 0

static

Definition at line 44 of file loopwavequeue.c.

Uint8* sound

Definition at line 31 of file loopwavequeue.c.

Uint32 soundlen

Definition at line 32 of file loopwavequeue.c.

SDL_AudioSpec spec

Definition at line 30 of file loopwavequeue.c.

struct { ... } wave

Referenced by loop(), and main().