Make sure that writeEncodedData returns a promise

Author: youennf

index.bs

@@ -196,12 +196,13 @@ The <dfn>readEncodedData</dfn> algorithm is given a |rtcObject| as parameter. It
 4. [=ReadableStream/enqueue=] |frame| in |rtcObject|.`[[readable]]`.
 
 The <dfn>writeEncodedData</dfn> algorithm is given a |rtcObject| as parameter and a |frame| as input. It is defined by running the following steps:
-1. If |frame|.`[[owner]]` is not equal to |rtcObject|, abort these steps. A processor cannot create frames, or move frames between streams.
-2. If the |frame|'s {{RTCEncodedVideoFrame/timestamp}} is equal to or larger than |rtcObject|.`[[lastReceivedFrameTimestamp]]`, abort these steps. A processor cannot reorder frames, although it may delay them or drop them.
+1. If |frame|.`[[owner]]` is not equal to |rtcObject|, abort these steps and return [=a promise resolved with=] undefined. A processor cannot create frames, or move frames between streams.
+2. If the |frame|'s {{RTCEncodedVideoFrame/timestamp}} is equal to or larger than |rtcObject|.`[[lastReceivedFrameTimestamp]]`, abort these steps and return [=a promise resolved with=] undefined. A processor cannot reorder frames, although it may delay them or drop them.
 3. Set |rtcObject|.`[[lastReceivedFrameTimestamp]]` to the |frame|'s {{RTCEncodedVideoFrame/timestamp}}.
-4. Process the frame as if it came directly from the encoded data source:
-    * If |rtcObject| is a {{RTCRtpSender}}, enqueue it |rtcObject|'s packetizer.
+4. Process the frame as if it came directly from the encoded data source, by running the following steps [=in parallel=]:
+    * If |rtcObject| is a {{RTCRtpSender}}, enqueue it to |rtcObject|'s packetizer.
     * If |rtcObject| is a {{RTCRtpReceiver}}, enqueue it to |rtcObject|'s decoder.
+5. Return [=a promise resolved with=] undefined.
 
 ## Extension attribute ## {#attribute}