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sdlaudio: do not allow multiple instances 

Since SDL uses a lot of global data, we can't create independent
instances of sdl audio backend.

Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Kővágó, Zoltán 2015-06-03 23:03:55 +02:00 committed by Gerd Hoffmann
parent d1f52a1d70
commit 81ebb07c56
1 changed files with 7 additions and 0 deletions
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7
audio/sdlaudio.c
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@ -55,6 +55,7 @@ static struct SDLAudioState {
SDL_mutex *mutex;
SDL_sem *sem;
int initialized;
bool driver_created;
} glob_sdl;
typedef struct SDLAudioState SDLAudioState;
@ -393,6 +394,10 @@ static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...)
static void *sdl_audio_init (void)
{
SDLAudioState *s = &glob_sdl;
if (s->driver_created) {
sdl_logerr("Can't create multiple sdl backends\n");
return NULL;
}
if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
sdl_logerr ("SDL failed to initialize audio subsystem\n");
@ -414,6 +419,7 @@ static void *sdl_audio_init (void)
return NULL;
}
s->driver_created = true;
return s;
}
@ -424,6 +430,7 @@ static void sdl_audio_fini (void *opaque)
SDL_DestroySemaphore (s->sem);
SDL_DestroyMutex (s->mutex);
SDL_QuitSubSystem (SDL_INIT_AUDIO);
s->driver_created = false;
}
static struct audio_option sdl_options[] = {