commit 6cc9cca5a6df2de77d3aad212364deee48e82226
author Benjamin Wright <benwright@webrtc.org> Wed Oct 10 00:29:54 2018
committer Commit Bot <commit-bot@chromium.org> Wed Oct 10 16:45:39 2018
tree f2c6cbb57da3f170604bd066e2a54b4c16826daa
parent da67c16c81383fed826f5c74c064eeb329f331c8

Don't reset streams for the FrameEncryptor / FrameDecryptor unless they changed.

This change prevents resets unless someone actually set a FrameEncryptor
/ FrameDecryptor.

Bug: webrtc:9795
Change-Id: I29910b9ecc2f6f8eea371c5961ac7e9780de65d2
Reviewed-on: https://webrtc-review.googlesource.com/c/104901
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Commit-Queue: Benjamin Wright <benwright@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25095}

pc/rtpreceiver.cc

diff --git a/pc/rtpreceiver.cc b/pc/rtpreceiver.cc
index d4a1f62..d2d7206 100644
--- a/pc/rtpreceiver.cc
+++ b/pc/rtpreceiver.cc
@@ -51,8 +51,8 @@
     rtc::Thread* worker_thread,
     rtc::scoped_refptr<webrtc::FrameDecryptorInterface> frame_decryptor,
     cricket::MediaChannel* media_channel) {
-  if (media_channel && ssrc.has_value()) {
-    return worker_thread->Invoke<void>(RTC_FROM_HERE, [&] {
+  if (media_channel && frame_decryptor && ssrc.has_value()) {
+    worker_thread->Invoke<void>(RTC_FROM_HERE, [&] {
       media_channel->SetFrameDecryptor(*ssrc, frame_decryptor);
     });
   }
@@ -156,9 +156,12 @@
 void AudioRtpReceiver::SetFrameDecryptor(
     rtc::scoped_refptr<FrameDecryptorInterface> frame_decryptor) {
   frame_decryptor_ = std::move(frame_decryptor);
-  // Attach the frame decryptor to the media channel if it exists.
-  MaybeAttachFrameDecryptorToMediaChannel(ssrc_, worker_thread_,
-                                          frame_decryptor_, media_channel_);
+  // Special Case: Set the frame decryptor to any value on any existing channel.
+  if (media_channel_ && ssrc_.has_value()) {
+    worker_thread_->Invoke<void>(RTC_FROM_HERE, [&] {
+      media_channel_->SetFrameDecryptor(*ssrc_, frame_decryptor_);
+    });
+  }
 }
 
 rtc::scoped_refptr<FrameDecryptorInterface>
@@ -347,9 +350,12 @@
 void VideoRtpReceiver::SetFrameDecryptor(
     rtc::scoped_refptr<FrameDecryptorInterface> frame_decryptor) {
   frame_decryptor_ = std::move(frame_decryptor);
-  // Attach the new frame decryptor the media channel if it exists yet.
-  MaybeAttachFrameDecryptorToMediaChannel(ssrc_, worker_thread_,
-                                          frame_decryptor_, media_channel_);
+  // Special Case: Set the frame decryptor to any value on any existing channel.
+  if (media_channel_ && ssrc_.has_value()) {
+    worker_thread_->Invoke<void>(RTC_FROM_HERE, [&] {
+      media_channel_->SetFrameDecryptor(*ssrc_, frame_decryptor_);
+    });
+  }
 }
 
 rtc::scoped_refptr<FrameDecryptorInterface>