Merge pull request #2071 from w3c/hta-rid-send-1896

Describe how RIDs are added to a media section
w3c · Jan 31, 2019 · 5baf1e7 · 5baf1e7
2 parents 3455fd8 + 57a88d0
commit 5baf1e7
Showing 1 changed file with 34 additions and 0 deletions.
diff --git a/webrtc.html b/webrtc.html
@@ -2597,6 +2597,27 @@ <h2>Methods</h2>
                         <p>The filtering MUST NOT change the order of the codec
                         preferences.</p>
                       </li>
+                      <li>
+                        <p>If the length of the <a>[[\SendEncodings]]</a> slot
+                          of the RTCRtpSender is
+                          larger than 1, then
+                          for each encoding given in <a>[[\SendEncodings]]</a>
+                          of the RTCRtpSender, add an "a=rid send" line to the
+                          corresponding media section, and add an
+                          "a=simulcast:send"
+                          line giving the RIDs in the same order as
+                          given in the "encodings" field. No RID restrictions
+                          are set.
+                        </p>
+                        <p class="note">
+                          [[SDP-SIMULCAST]] section 5.2
+                          specifies that the order of RIDs in the a=simulcast
+                          line suggests a proposed order of preference.
+                          If the browser decides not to transmit all encodings,
+                          one should expect it to stop sending the last
+                          encoding in the list first.
+                        </p>
+                      </li>
                     </ol>
                   </li>
                   <li>
@@ -2809,6 +2830,19 @@ <h2>Methods</h2>
                         <p>The filtering MUST NOT change the order of the codec
                         preferences.</p>
                       </li>
+                      <li>
+                       <p>If the length of the <a>[[\SendEncodings]]</a> slot
+                          of the RTCRtpSender is
+                          larger than 1, then
+                          for each encoding given in <a>[[\SendEncodings]]</a>
+                          of the RTCRtpSender, add an "a=rid send" line to the
+                          corresponding media section, and add an
+                          "a=simulcast:send"
+                          line giving the RIDs in the same order as
+                          given in the "encodings" field. No RID restrictions
+                          are set.
+                        </p>
+                       </li>
                     </ol>
                   </li>
                   <li>