Added mixer back to client

cmd/client/main.go

@@ -16,7 +16,8 @@ var decoders = map[pnyx.PeerID]chan[]byte{}
 var encoder *opus.Encoder
 var sample_rate int = 0
 var mic = make(chan []byte, 0)
-var speaker = make(chan []int16, 1)
+var speaker = make(chan []int16, 0)
+var audio_data = make(chan []int16, 0)
 
 func set_sample_rate(new_sample_rate int) error {
   fmt.Printf("Setting sample rate to %d\n", new_sample_rate)
@@ -61,10 +62,7 @@ func handle_peer_decode(peer_id pnyx.PeerID, decode_chan chan[]byte, sample_rate
       if err != nil {
         panic(err)
       }
-      select {
-      case speaker <- pcm:
-      default:
-      }
+      audio_data <- pcm
 
     case data := <-decode_chan:
       missed = 0
@@ -76,21 +74,39 @@ func handle_peer_decode(peer_id pnyx.PeerID, decode_chan chan[]byte, sample_rate
         if err != nil {
           panic(err)
         }
-        select {
-        case speaker <- pcm[:written]:
-        default:
+        audio_data <- pcm[:written]
+      }
+    }
+  }
+}
+
+func mixer(data_chan chan []int16, speaker_chan chan []int16) {
+  var samples []int16 = nil
+  for true {
+    if samples == nil {
+      samples = <- data_chan
+    } else {
+      select {
+      case new_samples := <- data_chan:
+        for i, sample := range(new_samples) {
+          samples[i] += sample
         }
+      case speaker_chan <- samples:
+        samples = nil
       }
     }
   }
 }
 
+
 func main() {
   ctx, err := malgo.InitContext(nil, malgo.ContextConfig{}, nil)
   if err != nil {
     panic(err)
   }
 
+  go mixer(audio_data, speaker)
+
   defer ctx.Free()
   defer ctx.Uninit()