Adding cbr support for Opus

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

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
index bac963f4e8e2de9ff047ac78d889e9b187c6469e..05ba589d94f6dacc0d74206268764d8aa45cb07a 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.cc
@@ -260,6 +260,20 @@ bool AudioEncoderOpus::GetDtx() const {
   return config_.dtx_enabled;
 }
 
+bool AudioEncoderOpus::SetCbr(bool enable) {
+  if (enable) {
+    RTC_CHECK_EQ(0, WebRtcOpus_EnableCbr(inst_));
+  } else {
+    RTC_CHECK_EQ(0, WebRtcOpus_DisableCbr(inst_));
+  }
+  config_.cbr_enabled = enable;
+  return true;
+}
+
+bool AudioEncoderOpus::GetCbr() const {
+  return config_.cbr_enabled;
+}
+
 bool AudioEncoderOpus::SetApplication(Application application) {
   auto conf = config_;
   switch (application) {