Pass SdpAudioFormat through Channel, without converting to CodecInst

webrtc/modules/audio_coding/codecs/mock/mock_audio_decoder_factory.h

 /*
  *  Copyright (c) 2016 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_CODECS_MOCK_MOCK_AUDIO_DECODER_FACTORY_H_
 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_MOCK_MOCK_AUDIO_DECODER_FACTORY_H_
 
 #include <vector>
 
 #include "webrtc/base/scoped_ref_ptr.h"
 #include "webrtc/modules/audio_coding/codecs/audio_decoder_factory.h"
+#include "webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.h"

[the sun, 2016/12/15 15:34:13]

Why?

 #include "webrtc/test/gmock.h"
 
 namespace webrtc {
 
 class MockAudioDecoderFactory : public AudioDecoderFactory {
  public:
   MOCK_METHOD0(GetSupportedDecoders, std::vector<AudioCodecSpec>());
+  MOCK_METHOD1(IsSupportedDecoder, bool(const SdpAudioFormat&));
   std::unique_ptr<AudioDecoder> MakeAudioDecoder(
       const SdpAudioFormat& format) {
     std::unique_ptr<AudioDecoder> return_value;
     MakeAudioDecoderMock(format, &return_value);
     return return_value;
   }
   MOCK_METHOD2(MakeAudioDecoderMock,
                void(const SdpAudioFormat& format,
                     std::unique_ptr<AudioDecoder>* return_value));
 
   // Creates a MockAudioDecoderFactory with no formats and that may not be
   // invoked to create a codec - useful for initializing a voice engine, for
   // example.
   static rtc::scoped_refptr<webrtc::MockAudioDecoderFactory>
   CreateUnusedFactory() {
     using testing::_;
     using testing::AnyNumber;
     using testing::Return;
 
     rtc::scoped_refptr<webrtc::MockAudioDecoderFactory> factory =
         new rtc::RefCountedObject<webrtc::MockAudioDecoderFactory>;
     ON_CALL(*factory.get(), GetSupportedDecoders())
         .WillByDefault(Return(std::vector<webrtc::AudioCodecSpec>()));
     EXPECT_CALL(*factory.get(), GetSupportedDecoders()).Times(AnyNumber());
+    ON_CALL(*factory, IsSupportedDecoder(_)).WillByDefault(Return(false));
+    EXPECT_CALL(*factory, IsSupportedDecoder(_)).Times(AnyNumber());
     EXPECT_CALL(*factory.get(), MakeAudioDecoderMock(_, _)).Times(0);
     return factory;
   }
 
   // Creates a MockAudioDecoderFactory with no formats that may be invoked to
   // create a codec any number of times. It will, though, return nullptr on each
   // call, since it supports no codecs.
   static rtc::scoped_refptr<webrtc::MockAudioDecoderFactory>
   CreateEmptyFactory() {
     using testing::_;
     using testing::AnyNumber;
     using testing::Return;
     using testing::SetArgPointee;
 
     rtc::scoped_refptr<webrtc::MockAudioDecoderFactory> factory =
         new rtc::RefCountedObject<webrtc::MockAudioDecoderFactory>;
     ON_CALL(*factory.get(), GetSupportedDecoders())
         .WillByDefault(Return(std::vector<webrtc::AudioCodecSpec>()));
     EXPECT_CALL(*factory.get(), GetSupportedDecoders()).Times(AnyNumber());
+    ON_CALL(*factory, IsSupportedDecoder(_)).WillByDefault(Return(false));
+    EXPECT_CALL(*factory, IsSupportedDecoder(_)).Times(AnyNumber());
     ON_CALL(*factory.get(), MakeAudioDecoderMock(_, _))
         .WillByDefault(SetArgPointee<1>(nullptr));
     EXPECT_CALL(*factory.get(), MakeAudioDecoderMock(_, _)).Times(AnyNumber());
     return factory;
   }
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_MOCK_MOCK_AUDIO_DECODER_FACTORY_H_