Render file playback through the OpenAL owner

gumble/gumbleopenal/stream.go

@@ -82,6 +82,8 @@ type Stream struct {
 	micAGC              *audio.AGC
 	micAGCRight         *audio.AGC
 	filePlayer          FilePlayer
+	localSource         *openal.Source
+	localBuffers        openal.Buffers
 	recorderMu          sync.RWMutex
 	errorFunc           func(error) // called on capture errors
 	recorder            Recorder
@@ -200,6 +202,54 @@ func (s *Stream) SetNoiseProcessor(np NoiseProcessor) {
 
 func (s *Stream) SetFilePlayer(fp FilePlayer) {
 	s.filePlayer = fp
+	if player, ok := fp.(interface{ SetLocalPlayback(func([]byte)) }); ok {
+		player.SetLocalPlayback(s.playLocalAudio)
+	}
+}
+
+func (s *Stream) playLocalAudio(data []byte) {
+	s.render(func() {
+		if data == nil {
+			if s.localSource != nil {
+				s.localSource.Stop()
+				queued := s.localSource.BuffersQueued()
+				if queued > 0 {
+					buffers := make(openal.Buffers, queued)
+					s.localSource.UnqueueBuffers(buffers)
+					s.localBuffers = append(s.localBuffers, buffers...)
+				}
+				s.localSource.Delete()
+				s.localSource = nil
+			}
+			if len(s.localBuffers) > 0 {
+				s.localBuffers.Delete()
+				s.localBuffers = nil
+			}
+			return
+		}
+		if s.localSource == nil {
+			source := openal.NewSource()
+			source.SetGain(1)
+			s.localSource = &source
+			s.localBuffers = openal.NewBuffers(64)
+		}
+		if n := s.localSource.BuffersProcessed(); n > 0 {
+			buffers := make(openal.Buffers, n)
+			s.localSource.UnqueueBuffers(buffers)
+			s.localBuffers = append(s.localBuffers, buffers...)
+		}
+		if len(s.localBuffers) == 0 {
+			return
+		}
+		last := len(s.localBuffers) - 1
+		buffer := s.localBuffers[last]
+		s.localBuffers = s.localBuffers[:last]
+		buffer.SetData(openal.FormatStereo16, data, gumble.AudioSampleRate)
+		s.localSource.QueueBuffer(buffer)
+		if s.localSource.State() != openal.Playing {
+			s.localSource.Play()
+		}
+	})
 }
 
 func (s *Stream) GetFilePlayer() FilePlayer {