Let AudioCodingModule::SendCodec return Maybe<CodecInst>

webrtc/modules/audio_coding/main/acm2/codec_manager.h

 /*
  *  Copyright (c) 2015 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.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_CODEC_MANAGER_H_
 #define WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_CODEC_MANAGER_H_
 
 #include "webrtc/base/constructormagic.h"
+#include "webrtc/base/maybe.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/base/thread_checker.h"
 #include "webrtc/modules/audio_coding/main/acm2/codec_owner.h"
 #include "webrtc/modules/audio_coding/main/include/audio_coding_module_typedefs.h"
 #include "webrtc/common_types.h"
 
 namespace webrtc {
 
 class AudioDecoder;
 class AudioEncoder;
 
 namespace acm2 {
 
 class CodecManager final {
  public:
   CodecManager();
   ~CodecManager();
 
   int RegisterEncoder(const CodecInst& send_codec);
 
   void RegisterEncoder(AudioEncoder* external_speech_encoder);
 
-  int GetCodecInst(CodecInst* current_codec) const;
+  rtc::Maybe<CodecInst> GetCodecInst() const;
 
   bool SetCopyRed(bool enable);
 
   int SetVAD(bool enable, ACMVADMode mode);
 
   void VAD(bool* dtx_enabled, bool* vad_enabled, ACMVADMode* mode) const;
 
   int SetCodecFEC(bool enable_codec_fec);
 
   // Returns a pointer to AudioDecoder of the given codec. For iSAC, encoding
@@ skipping 33 matching lines @@
   bool codec_fec_enabled_;
   CodecOwner codec_owner_;
   bool encoder_is_opus_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(CodecManager);
 };
 
 }  // namespace acm2
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_MAIN_ACM2_CODEC_MANAGER_H_