static int Audio_Available(void)
{
int available;
int status;
snd_pcm_t *handle;
available = 0;
if (LoadALSALibrary() < 0) {
return available;
}
status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
if ( status >= 0 ) {
available = 1;
SDL_NAME(snd_pcm_close)(handle);
}
UnloadALSALibrary();
return(available);
}
static int
LoadALSALibrary(void)
{
int retval = 0;
if (alsa_handle == NULL) {
alsa_handle = SDL_LoadObject(alsa_library);
if (alsa_handle == NULL) {
retval = -1;
/* Don't call SDL_SetError(): SDL_LoadObject already did. */
} else {
retval = load_alsa_syms();
if (retval < 0) {
UnloadALSALibrary();
}
}
}
return retval;
}
static int LoadALSALibrary(void) {
int i, retval = -1;
alsa_handle = SDL_LoadObject(alsa_library);
if (alsa_handle) {
alsa_loaded = 1;
retval = 0;
for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
*alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);
if (!*alsa_functions[i].func) {
retval = -1;
UnloadALSALibrary();
break;
}
}
}
return retval;
}
static int
LoadALSALibrary(void)
{
int retval = 0;
if (alsa_handle == NULL) {
alsa_handle = dlopen(alsa_library, RTLD_NOW);
if (alsa_handle == NULL) {
retval = -1;
SDL_SetError("ALSA: dlopen('%s') failed: %s\n",
alsa_library, strerror(errno));
} else {
retval = load_alsa_syms();
if (retval < 0) {
UnloadALSALibrary();
}
}
}
return retval;
}
static int LoadALSALibrary(void) {
int i, retval = -1;
/* alsa_handle = SDL_LoadObject(alsa_library);*/
alsa_handle = dlopen(alsa_library,RTLD_NOW);
if (alsa_handle) {
alsa_loaded = 1;
retval = 0;
for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
/* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
#if HAVE_DLVSYM
*alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9");
if (!*alsa_functions[i].func)
#endif
*alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name);
if (!*alsa_functions[i].func) {
retval = -1;
UnloadALSALibrary();
break;
}
}
}
return retval;
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
SDL_free(device->hidden);
SDL_free(device);
UnloadALSALibrary();
}
static void
ALSA_Deinitialize(void)
{
UnloadALSALibrary();
}