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Added support to loopwave for hotplugging audio devices

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slouken committed Mar 9, 2017
1 parent c1802ef commit aae481294d9430c3c25054343345774aa72ff39d
Showing with 53 additions and 26 deletions.
  1. +53 −26 test/loopwave.c
@@ -38,6 +38,7 @@ static struct
int soundpos; /* Current play position */
} wave;

static SDL_AudioDeviceID device;

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
@@ -47,6 +48,37 @@ quit(int rc)
exit(rc);
}

static void
close_audio()
{
if (device != 0) {
SDL_CloseAudioDevice(device);
device = 0;
}
}

static void
open_audio()
{
/* Initialize fillerup() variables */
device = SDL_OpenAudioDevice(NULL, SDL_FALSE, &wave.spec, NULL, 0);
if (!device) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open audio: %s\n", SDL_GetError());
SDL_FreeWAV(wave.sound);
quit(2);
}


/* Let the audio run */
SDL_PauseAudioDevice(device, SDL_FALSE);
}

static void reopen_audio()
{
close_audio();
open_audio();
}


void SDLCALL
fillerup(void *unused, Uint8 * stream, int len)
@@ -82,7 +114,7 @@ poked(int sig)
void
loop()
{
if(done || (SDL_GetAudioStatus() != SDL_AUDIO_PLAYING))
if(done || (SDL_GetAudioDeviceStatus(device) != SDL_AUDIO_PLAYING))
emscripten_cancel_main_loop();
}
#endif
@@ -97,7 +129,7 @@ main(int argc, char *argv[])
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

/* Load the SDL library */
if (SDL_Init(SDL_INIT_AUDIO) < 0) {
if (SDL_Init(SDL_INIT_AUDIO|SDL_INIT_EVENTS) < 0) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
@@ -114,45 +146,40 @@ main(int argc, char *argv[])
}

wave.spec.callback = fillerup;
#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 */

/* Show the list of available drivers */
SDL_Log("Available audio drivers:");
for (i = 0; i < SDL_GetNumAudioDrivers(); ++i) {
SDL_Log("%i: %s", i, SDL_GetAudioDriver(i));
}
}

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

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

/* Let the audio run */
SDL_PauseAudio(0);
SDL_FlushEvents(SDL_AUDIODEVICEADDED, SDL_AUDIODEVICEREMOVED);

#ifdef __EMSCRIPTEN__
emscripten_set_main_loop(loop, 0, 1);
#else
while (!done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING))
SDL_Delay(1000);
while (!done) {
SDL_Event event;

while (SDL_PollEvent(&event) > 0) {
if (event.type == SDL_QUIT) {
done = 1;
}
if ((event.type == SDL_AUDIODEVICEADDED && !event.adevice.iscapture) ||
(event.type == SDL_AUDIODEVICEREMOVED && !event.adevice.iscapture && event.adevice.which == device)) {
reopen_audio();
}
}
SDL_Delay(100);
}
#endif

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

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