Don't reconfigure the encoder if the video options aren't changing.

webrtc/media/engine/webrtcvideoengine2_unittest.cc

 /*
  *  Copyright (c) 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 1793 matching lines @@
   stream = SetDenoisingOption(last_ssrc_, &capturer, true);
 
   ASSERT_TRUE(stream->GetVp8Settings(&vp8_settings)) << "No VP8 config set.";
   EXPECT_FALSE(vp8_settings.denoisingOn);
   EXPECT_FALSE(vp8_settings.automaticResizeOn);
   EXPECT_FALSE(vp8_settings.frameDroppingOn);
 
   EXPECT_TRUE(channel_->SetCapturer(last_ssrc_, NULL));
 }
 
+// Test that setting the same options doesn't result in the encoder being
+// reconfigured.
+TEST_F(WebRtcVideoChannel2Test, SetIdenticalOptionsDoesntReconfigureEncoder) {
+  VideoOptions options;
+  cricket::FakeVideoCapturer capturer;
+
+  FakeVideoSendStream* send_stream = AddSendStream();
+  EXPECT_TRUE(channel_->SetCapturer(last_ssrc_, &capturer));
+  EXPECT_EQ(cricket::CS_RUNNING,
+            capturer.Start(capturer.GetSupportedFormats()->front()));
+  EXPECT_TRUE(channel_->SetVideoSend(last_ssrc_, true, &options));
+  EXPECT_TRUE(capturer.CaptureFrame());
+  // Expect 2 reconfigurations at this point, from the initial configuration
+  // and from the dimensions of the first frame.
+  EXPECT_EQ(2, send_stream->num_encoder_reconfigurations());
+
+  // Set the options one more time and expect no additional reconfigurations.
+  EXPECT_TRUE(channel_->SetVideoSend(last_ssrc_, true, &options));
+  EXPECT_TRUE(capturer.CaptureFrame());
+  EXPECT_EQ(2, send_stream->num_encoder_reconfigurations());
+
+  EXPECT_TRUE(channel_->SetCapturer(last_ssrc_, nullptr));
+}
+
 class Vp9SettingsTest : public WebRtcVideoChannel2Test {
  public:
   Vp9SettingsTest() : Vp9SettingsTest("") {}
   explicit Vp9SettingsTest(const char* field_trials)
       : WebRtcVideoChannel2Test(field_trials) {
     encoder_factory_.AddSupportedVideoCodecType(webrtc::kVideoCodecVP9, "VP9");
   }
   virtual ~Vp9SettingsTest() {}
 
  protected:
@@ skipping 1666 matching lines @@
 }
 
 // Test that we normalize send codec format size in simulcast.
 TEST_F(WebRtcVideoChannel2SimulcastTest, SetSendCodecsWithOddSizeInSimulcast) {
   cricket::VideoCodec codec(kVp8Codec270p);
   codec.width += 1;
   codec.height += 1;
   VerifySimulcastSettings(codec, 2, 2);
 }
 }  // namespace cricket