Pass SdpAudioFormat through Channel, without converting to CodecInst

webrtc/modules/audio_coding/codecs/builtin_audio_decoder_factory.cc

 /*
  *  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.
  */
 
@@ skipping 114 matching lines @@
                   : nullptr;
      }},
 #endif
 };
 
 class BuiltinAudioDecoderFactory : public AudioDecoderFactory {
  public:
   std::vector<AudioCodecSpec> GetSupportedDecoders() override {
     static std::vector<AudioCodecSpec> specs = {
 #ifdef WEBRTC_CODEC_OPUS
-      { { "opus", 48000, 2, {
-            {"minptime", "10" },
-            {"useinbandfec", "1" }
-          }
-        }, false
-      },
+      {{"opus",
+        48000,
+        2,
+        { {"minptime", "10"},
+          {"stereo", "0"},
+          { "useinbandfec",
+            "1" } }},
+       false},
 #endif
 #if (defined(WEBRTC_CODEC_ISAC) || defined(WEBRTC_CODEC_ISACFX))
-      { { "isac", 16000, 1 }, true },
+      {{"isac", 16000, 1}, true},
 #endif
 #if (defined(WEBRTC_CODEC_ISAC))
-      { { "isac", 32000, 1 }, true },
+      {{"isac", 32000, 1}, true},
 #endif
 #ifdef WEBRTC_CODEC_G722
-      { { "G722", 8000,  1 }, true },
+      {{"G722", 8000, 1}, true},
 #endif
 #ifdef WEBRTC_CODEC_ILBC
-      { { "iLBC", 8000,  1 }, true },
+      {{"iLBC", 8000, 1}, true},
 #endif
-      { { "PCMU", 8000,  1 }, true },
-      { { "PCMA", 8000,  1 }, true }
+      {{"PCMU", 8000, 1}, true},
+      {{"PCMA", 8000, 1}, true}
     };
 
     return specs;
   }
 
   std::unique_ptr<AudioDecoder> MakeAudioDecoder(
       const SdpAudioFormat& format) override {
     for (const auto& dc : decoder_constructors) {
       if (STR_CASE_CMP(format.name.c_str(), dc.name) == 0) {
         std::unique_ptr<AudioDecoder> dec = dc.constructor(format);
@@ skipping 12 matching lines @@
 };
 
 }  // namespace
 
 rtc::scoped_refptr<AudioDecoderFactory> CreateBuiltinAudioDecoderFactory() {
   return rtc::scoped_refptr<AudioDecoderFactory>(
       new rtc::RefCountedObject<BuiltinAudioDecoderFactory>);
 }
 
 }  // namespace webrtc