Adding cbr support for Opus

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
index 1d4fc2e7813c9c3b2eee1bc6596be2ace20e47f6..ab307ac59efd6636590b9dbbfa1e4e47be5664a3 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus_unittest.cc
@@ -182,6 +182,16 @@ TEST(AudioEncoderOpusTest, ToggleDtx) {
   EXPECT_TRUE(states.encoder->SetDtx(false));
 }
 
+TEST(AudioEncoderOpusTest, ToggleCbr) {
+  auto states = CreateCodec(2);
+  // Enable CBR
+  EXPECT_TRUE(states.encoder->SetCbr(true));
+  // Verify that the mode is still kAudio.
+  EXPECT_EQ(AudioEncoderOpus::kAudio, states.encoder->application());

[minyue-webrtc, 2017/03/30 20:36:17]

please don't check application here, (see above comment)

Check Cbr with GetCbr

+  // Turn off CBR.
+  EXPECT_TRUE(states.encoder->SetCbr(false));
+}
+
 TEST(AudioEncoderOpusTest,
      OnReceivedUplinkBandwidthWithoutAudioNetworkAdaptor) {
   auto states = CreateCodec(1);