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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!
Ryan C. Gordon vor 4 Jahren
Ursprung
Commit
e7e519a466
1 geänderte Dateien mit 15 neuen und 0 gelöschten Zeilen
  1. 15 0
      src/audio/dsp/SDL_dspaudio.c

+ 15 - 0
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;