SDL_audio.c: Fix crash if we switch from direct output to streaming, …

…and if the buffersizes change.

src/audio/SDL_audio.c

@@ -703,19 +703,23 @@ static int SDLCALL SDL_RunAudio(void *userdata)
 
         /* Fill the current buffer with sound */
         if (!device->stream && SDL_AtomicGet(&device->enabled)) {
-            SDL_assert(data_len == device->spec.size);
             data = current_audio.impl.GetDeviceBuf(device);
+
+            if (device->stream && SDL_AtomicGet(&device->enabled)) {
+                // Oops. Wasapi reset and now we stream, so just one silence for now
+                current_audio.impl.PlayDevice(device);
+                current_audio.impl.WaitDevice(device);
+                data = device->work_buffer;
+            } else { // direct output
+                data_len = device->spec.size;
+            }
         } else {
             /* if the device isn't enabled, we still write to the
                work_buffer, so the app's callback will fire with
                a regular frequency, in case they depend on that
                for timing or progress. They can use hotplug
                now to know if the device failed.
                Streaming playback uses work_buffer, too. */
-            data = NULL;
-        }
-
-        if (data == NULL) {
             data = device->work_buffer;
         }