Release queued OpenAL buffers on stream shutdown

gumble/gumbleopenal/stream.go

@@ -487,8 +487,16 @@ func (s *Stream) OnAudioStream(e *gumble.AudioStreamEvent) {
 		}
 		reclaim()
 		s.render(func() {
-			emptyBufs.Delete()
+			// OpenAL does not delete buffers when a source is deleted. Reclaim
+			// queued buffers after stopping so every generated buffer is freed.
+			source.Stop()
+			if n := source.BuffersQueued(); n > 0 {
+				queuedBufs := make(openal.Buffers, n)
+				source.UnqueueBuffers(queuedBufs)
+				emptyBufs = append(emptyBufs, queuedBufs...)
+			}
 			source.Delete()
+			emptyBufs.Delete()
 			e.User.SetAudioSource(nil)
 		})
 		log.Debug("audio stream ended for user %s", e.User.Name)