Commit e7e519a466167b7a3ef9aa9b28535e436139936a
2021-03-17T13:04:05
dsp: Refuse to initialize if there aren't any Open Sound System devices. This prevents the dsp target from stealing the audio subsystem but not being able to produce sound, so other audio targets further down the list can make an attempt instead. Thanks to Frank Praznik who did a lot of the research on this problem!
diff --git a/src/audio/dsp/SDL_dspaudio.c b/src/audio/dsp/SDL_dspaudio.c
index 1622c6f..2124dcc 100644
--- a/src/audio/dsp/SDL_dspaudio.c
+++ b/src/audio/dsp/SDL_dspaudio.c
@@ -292,9 +292,24 @@ DSP_FlushCapture(_THIS)
}
}
+static SDL_bool InitTimeDevicesExist = SDL_FALSE;
+static int
+look_for_devices_test(int fd)
+{
+ InitTimeDevicesExist = SDL_TRUE; /* note that _something_ exists. */
+ /* Don't add to the device list, we're just seeing if any devices exist. */
+ return 0;
+}
+
static int
DSP_Init(SDL_AudioDriverImpl * impl)
{
+ InitTimeDevicesExist = SDL_FALSE;
+ SDL_EnumUnixAudioDevices(0, look_for_devices_test);
+ if (!InitTimeDevicesExist) {
+ return 0; /* maybe try a different backend. */
+ }
+
/* Set the function pointers */
impl->DetectDevices = DSP_DetectDevices;
impl->OpenDevice = DSP_OpenDevice;