Initial set of events and API split

Author: alvestrand

index.bs

@@ -586,18 +586,34 @@ interface RTCTransformEvent : Event {
     readonly attribute RTCRtpScriptTransformer transformer;
 };
 
+interface BandwidthInfo {
+    readonly attribute long bandwidth;  // bits per second
+    readonly attribute long bufferDepth; // bytes that can be sent with no loss at sender
+};
+
 partial interface DedicatedWorkerGlobalScope {
     attribute EventHandler onrtctransform;
 };
 
-[Exposed=DedicatedWorker]
-interface RTCRtpScriptTransformer {
+interface mixin RTCRtpScriptSource {
     readonly attribute ReadableStream readable;
-    readonly attribute WritableStream writable;
-    readonly attribute any options;
     Promise<unsigned long long> generateKeyFrame(optional DOMString rid);
     Promise<undefined> sendKeyFrameRequest();
+    undefined bandwidthEstimate(BandwidthInfo info);
+};
+
+interface mixin RTCRtpScriptSink {
+    readonly attribute WritableStream writable;
+    attribute EventHandler onbandwidthestimate;
+    attribute EventHandler onkeyframerequest;
+};
+
+[Exposed=DedicatedWorker]
+interface RTCRtpScriptTransformer {
+    readonly attribute any options;
 };
+RTCRtpScriptTransformer includes RTCRtpScriptSource;
+RTCRtpScriptTransformer includes RTCRtpScriptSink;
 
 [Exposed=Window]
 interface RTCRtpScriptTransform {