drafting spectrum analyzer

tracker/detector.go

@@ -62,6 +62,10 @@ type (
 		history   [11]float32
 		tmp, tmp2 []float32
 	}
+
+	chunker struct {
+		buffer sointu.AudioBuffer
+	}
 )
 
 const (
@@ -132,7 +136,7 @@ func (s *Detector) handleMsg(msg MsgToDetector) {
 	switch data := msg.Data.(type) {
 	case *sointu.AudioBuffer:
 		buf := *data
-		for {
+		for len(buf) > 0 {
 			var chunk sointu.AudioBuffer
 			if len(s.chunkHistory) > 0 && len(s.chunkHistory) < 4410 {
 				l := min(len(buf), 4410-len(s.chunkHistory))
@@ -160,6 +164,7 @@ func (s *Detector) handleMsg(msg MsgToDetector) {
 				},
 			})
 		}
+		s.broker.PutAudioBuffer(data)
 	}
 }
 
@@ -432,3 +437,21 @@ func (d *peakDetector) reset() {
 		d.maxPower[chn] = 0
 	}
 }
+
+func (c *chunker) Process(input sointu.AudioBuffer, windowLength, overlap int, cb func(sointu.AudioBuffer)) sointu.AudioBuffer {
+	b := c.buffer
+	for len(b) >= windowLength {
+		cb(b[:windowLength])
+		b = b[windowLength-overlap:]
+	}
+	copy(c.buffer, b)
+	c.buffer = c.buffer[:len(b)]
+	for {
+		if len(c.buffer) > 0 {
+			l := min(len(input), windowLength-len(c.buffer))
+			c.buffer = append(c.buffer, input[:l]...)
+			input = input[l:]
+		}
+
+	}
+}