Pass SdpAudioFormat through Channel, without converting to CodecInst

webrtc/modules/audio_coding/acm2/rent_a_codec.cc

 /*
  *  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.
  */
 
@@ skipping 69 matching lines @@
       return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("l16", 32000, 2));
     case NetEqDecoder::kDecoderPCM16Bswb48kHz_2ch:
       return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("l16", 48000, 2));
     case NetEqDecoder::kDecoderPCM16B_5ch:
       return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("l16", 8000, 5));
     case NetEqDecoder::kDecoderG722:
       return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("g722", 8000, 1));
     case NetEqDecoder::kDecoderG722_2ch:
       return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("g722", 8000, 2));
     case NetEqDecoder::kDecoderOpus:
-      return rtc::Optional<SdpAudioFormat>(
-          SdpAudioFormat("opus", 48000, 2,
-                         std::map<std::string, std::string>{{"stereo", "0"}}));
+      return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("opus", 48000, 2));
     case NetEqDecoder::kDecoderOpus_2ch:
       return rtc::Optional<SdpAudioFormat>(
           SdpAudioFormat("opus", 48000, 2,
                          std::map<std::string, std::string>{{"stereo", "1"}}));
     case NetEqDecoder::kDecoderRED:
       return rtc::Optional<SdpAudioFormat>(SdpAudioFormat("red", 8000, 1));
     case NetEqDecoder::kDecoderAVT:
       return rtc::Optional<SdpAudioFormat>(
           SdpAudioFormat("telephone-event", 8000, 1));
     case NetEqDecoder::kDecoderAVT16kHz:
@@ skipping 277 matching lines @@
   }
   return encoder_stack;
 }
 
 std::unique_ptr<AudioDecoder> RentACodec::RentIsacDecoder(int sample_rate_hz) {
   return CreateIsacDecoder(sample_rate_hz, isac_bandwidth_info_);
 }
 
 }  // namespace acm2
 }  // namespace webrtc