From 6b381c7456a995e4d866c30d308e5fd7a7670286 Mon Sep 17 00:00:00 2001
From: Taylor Brandstetter <deadbeef@webrtc.org>
Date: Mon, 24 Aug 2020 13:28:47 -0700
Subject: [PATCH] Call SetVideoCodecSwitchingEnabled on every video media
 channel.

It was only being called for the first video media channel; with
unified plan SDP mode, it's possible to have multiple video media
channels, one for each video m= section.

Bug: webrtc:10795
Change-Id: I57fda9383d0f8803df1937ac5103d9ae354c0748
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/182404
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Taylor <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32010}
---
 pc/peer_connection.cc | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/pc/peer_connection.cc b/pc/peer_connection.cc
index 3665a82e03..8407d75f0c 100644
--- a/pc/peer_connection.cc
+++ b/pc/peer_connection.cc
@@ -4077,9 +4077,14 @@ RTCError PeerConnection::SetConfiguration(
   }
 
   if (modified_config.allow_codec_switching.has_value()) {
-    cricket::VideoMediaChannel* video_channel = video_media_channel();
-    if (video_channel) {
-      video_channel->SetVideoCodecSwitchingEnabled(
+    for (const auto& transceiver : transceivers_) {
+      if (transceiver->media_type() != cricket::MEDIA_TYPE_VIDEO ||
+          !transceiver->internal()->channel()) {
+        continue;
+      }
+      auto* video_channel = static_cast<cricket::VideoChannel*>(
+          transceiver->internal()->channel());
+      video_channel->media_channel()->SetVideoCodecSwitchingEnabled(
           *modified_config.allow_codec_switching);
     }
   }