Allow for use of audio data

pkg/bufferedvid/bufferedvid.go

@@ -41,15 +41,16 @@ const (
 // player holds all the data
 // necessary for playing video.
 type player struct {
-	pix         *image.NRGBA
-	ticker      <-chan time.Time
-	errs        <-chan error
-	frameBuffer <-chan *image.RGBA
-	audioBuffer <-chan [2]float64
-	last        time.Time
-	fps         int
-	paused      bool
-	frameCount  int64
+	pix            *image.NRGBA
+	ticker         <-chan time.Time
+	errs           <-chan error
+	frameBuffer    <-chan *image.RGBA
+	audioBuffer    <-chan [2]float64
+	last           time.Time
+	fps            int
+	paused         bool
+	frameCount     int64
+	audioProcessor func([2]float64)
 }
 
 // readVideoAndAudio reads video and audio frames
@@ -178,6 +179,18 @@ func (p *player) readVideoAndAudio(media *reisen.Media) (<-chan *image.RGBA, <-c
 	return frameBuffer, sampleBuffer, errs, nil
 }
 
+func (p *player) SetAudioProcessorFunc(f func(data [2]float64)) {
+	p.audioProcessor = f
+}
+
+func (p *player) processAudioFrame(data [2]float64) {
+	if p.audioProcessor != nil {
+		p.audioProcessor(data)
+	} else {
+		_ = data
+	}
+}
+
 // Starts reading samples and frames
 // of the media file.
 func (p *player) open(fname string) error {
@@ -294,12 +307,11 @@ func (w *BufferedVidPlayback) Play() {
 				fmt.Printf("Error %s\n", err.Error())
 			}
 			w.fpsTimer.Reset(frameDuration)
-			go func() {
-				// empty the audio buffer in case that's what's jamming things up.
+			go func(p player) {
 				for {
-					_ = <-w.playerStruct.audioBuffer
+					p.processAudioFrame(<-w.playerStruct.audioBuffer)
 				}
-			}()
+			}(w.playerStruct)
 			w.FillBuffer()
 			w.videoOpened = true
 		}