Pass SdpAudioFormat through Channel, without converting to CodecInst

webrtc/modules/audio_coding/codecs/audio_decoder_factory_unittest.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 104 matching lines @@
   ASSERT_TRUE(adf);
   // Opus supports 48 kHz, 2 channels, and wants a "stereo" parameter whose
   // value is either "0" or "1".
   for (int hz : {8000, 16000, 32000, 48000}) {
     for (int channels : {0, 1, 2, 3}) {
       for (std::string stereo : {"XX", "0", "1", "2"}) {
         std::map<std::string, std::string> params;
         if (stereo != "XX") {
           params["stereo"] = stereo;
         }
-        bool good =
-            (hz == 48000 && channels == 2 && (stereo == "0" || stereo == "1"));
+        const bool good = (hz == 48000 && channels == 2 &&
+                           (stereo == "XX" || stereo == "0" || stereo == "1"));
         EXPECT_EQ(good, static_cast<bool>(adf->MakeAudioDecoder(SdpAudioFormat(
                             "opus", hz, channels, std::move(params)))));
       }
     }
   }
 }
 
 }  // namespace webrtc