Log key frame and layer lock (#496)

pkg/sfu/buffer/buffer.go

@@ -515,6 +515,9 @@ func (b *Buffer) getExtPacket(rawPacket []byte, rtpPacket *rtp.Packet, arrivalTi
 	case "video/h264":
 		ep.KeyFrame = IsH264Keyframe(rtpPacket.Payload)
 	}
+	if ep.KeyFrame {
+		b.logger.Debugw("key frame received")
+	}
 
 	return ep, temporalLayer
 }

pkg/sfu/forwarder.go

@@ -1252,6 +1252,7 @@ func (f *Forwarder) getTranslationParamsVideo(extPkt *buffer.ExtPacket, layer in
 		if f.targetLayers.spatial == layer {
 			if extPkt.KeyFrame {
 				// lock to target layer
+				f.logger.Debugw("locking to target layer", "current", f.currentLayers, "target", f.targetLayers)
 				f.currentLayers.spatial = f.targetLayers.spatial
 				if f.currentLayers.spatial == f.maxLayers.spatial {
 					tp.isSwitchingToMaxLayer = true