commit e1b685a50a578f18aa9b023506e87a86dbeecf11
author Florent Castelli <orphis@webrtc.org> Fri Apr 30 17:11:37 2021
committer WebRTC LUCI CQ <webrtc-scoped@luci-project-accounts.iam.gserviceaccount.com> Fri Apr 30 18:55:47 2021
tree dd7aaa24156060a5462f967f19cbd492782149a7
parent c9716e0c71d7aa73bcfca0a0225bd6faddb6e650

simulcast: Limit audio transceivers to single stream

We don't support audio simulcast, so we should reject the layers
early during an addTransceiver() call.

Bug: webrtc:12719
Change-Id: Ieeb92c66de741e9b11943e0173a6f2e052926f13
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/216685
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33886}

pc/peer_connection.cc

diff --git a/pc/peer_connection.cc b/pc/peer_connection.cc
index 0323636..e2b3b61 100644
--- a/pc/peer_connection.cc
+++ b/pc/peer_connection.cc
@@ -997,9 +997,11 @@
   parameters.encodings = init.send_encodings;
 
   // Encodings are dropped from the tail if too many are provided.
-  if (parameters.encodings.size() > kMaxSimulcastStreams) {
+  size_t max_simulcast_streams =
+      media_type == cricket::MEDIA_TYPE_VIDEO ? kMaxSimulcastStreams : 1u;
+  if (parameters.encodings.size() > max_simulcast_streams) {
     parameters.encodings.erase(
-        parameters.encodings.begin() + kMaxSimulcastStreams,
+        parameters.encodings.begin() + max_simulcast_streams,
         parameters.encodings.end());
   }