Adding cbr support for Opus

webrtc/modules/audio_coding/acm2/audio_coding_module.cc

Index: webrtc/modules/audio_coding/acm2/audio_coding_module.cc
diff --git a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
index daeea3577e23a854d26f9b702c6d84f1c5ec989d..3b07ce3284c32cfa6df8c478fb807470d4a3010e 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
@@ -190,6 +190,10 @@ class AudioCodingModuleImpl final : public AudioCodingModule {
 
   int DisableOpusDtx() override;
 
+  int EnableOpusCbr() override;
+
+  int DisableOpusCbr() override;
+
   int UnregisterReceiveCodec(uint8_t payload_type) override;
 
   int EnableNack(size_t max_nack_list_size) override;
@@ -400,6 +404,7 @@ class RawAudioEncoderWrapper final : public AudioEncoder {
   }
   void Reset() override { return enc_->Reset(); }
   bool SetFec(bool enable) override { return enc_->SetFec(enable); }
+  bool SetCbr(bool enable) override { return enc_->SetCbr(enable); }
   bool SetDtx(bool enable) override { return enc_->SetDtx(enable); }
   bool SetApplication(Application application) override {
     return enc_->SetApplication(application);
@@ -1234,6 +1239,22 @@ int AudioCodingModuleImpl::DisableOpusDtx() {
   return encoder_stack_->SetDtx(false) ? 0 : -1;
 }
 
+int AudioCodingModuleImpl::EnableOpusCbr() {
+  rtc::CritScope lock(&acm_crit_sect_);
+  if (!HaveValidEncoder("EnableOpusCbr")) {
+    return -1;
+  }
+  return encoder_stack_->SetCbr(true) ? 0 : -1;
+}
+
+int AudioCodingModuleImpl::DisableOpusCbr() {
+  rtc::CritScope lock(&acm_crit_sect_);
+  if (!HaveValidEncoder("DisableOpusCbr")) {
+    return -1;
+  }
+  return encoder_stack_->SetCbr(false) ? 0 : -1;
+}
+
 int32_t AudioCodingModuleImpl::PlayoutTimestamp(uint32_t* timestamp) {
   rtc::Optional<uint32_t> ts = PlayoutTimestamp();
   if (!ts)