Adding cbr support for Opus

webrtc/voice_engine/include/voe_codec.h

Index: webrtc/voice_engine/include/voe_codec.h
diff --git a/webrtc/voice_engine/include/voe_codec.h b/webrtc/voice_engine/include/voe_codec.h
index cedf47d6b9ddf3e963d73f21fc7d8caaa080cc20..cbbd9c2c42b43022226d7e1e8e7b2d0f7130f18b 100644
--- a/webrtc/voice_engine/include/voe_codec.h
+++ b/webrtc/voice_engine/include/voe_codec.h
@@ -137,6 +137,14 @@ class WEBRTC_DLLEXPORT VoECodec {
   // are updated.
   virtual int GetOpusDtxStatus(int channel, bool* enabled) { return -1; }
 
+  // If send codec is Opus on a specified |channel|, set its CBR. Returns 0 if
+  // success, and -1 if failed.
+  virtual int SetOpusCbr(int channel, bool enable_cbr) = 0;

[the sun, 2017/03/23 08:46:44]

The legacy VoE APIs (e.g. VoECodec) are in the process of being removed. We
shouldn't add new functions to them.

+
+  // If send codec is Opus on a specified |channel|, return its CBR status.
+  // Returns 0 on success, and -1 if failed.
+  virtual int GetOpusCbrStatus(int channel, bool* enabled) { return -1; }
+
  protected:
   VoECodec() {}
   virtual ~VoECodec() {}