WebRtcVoiceEngine: Use AudioDecoderFactory to generate recv codecs.

webrtc/modules/audio_coding/codecs/audio_format.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.
  */
 
 #include "webrtc/modules/audio_coding/codecs/audio_format.h"
 
+#include "webrtc/common_types.h"
+
 namespace webrtc {
 
 SdpAudioFormat::SdpAudioFormat() = default;
 SdpAudioFormat::SdpAudioFormat(const SdpAudioFormat&) = default;
 SdpAudioFormat::SdpAudioFormat(SdpAudioFormat&&) = default;
 
 SdpAudioFormat::SdpAudioFormat(const char* name,
                                int clockrate_hz,
                                int num_channels)
     : name(name), clockrate_hz(clockrate_hz), num_channels(num_channels) {}
 
 SdpAudioFormat::SdpAudioFormat(const char* name,
                                int clockrate_hz,
                                int num_channels,
                                Parameters&& param)
     : name(name),
       clockrate_hz(clockrate_hz),
       num_channels(num_channels),
       parameters(std::move(param)) {}
 
 SdpAudioFormat::~SdpAudioFormat() = default;
 SdpAudioFormat& SdpAudioFormat::operator=(const SdpAudioFormat&) = default;
 SdpAudioFormat& SdpAudioFormat::operator=(SdpAudioFormat&&) = default;
 
+bool SdpAudioFormat::operator<(const SdpAudioFormat& b) const {
+  if (clockrate_hz == b.clockrate_hz) {
+    if (num_channels == b.num_channels) {
+      int name_cmp = STR_CASE_CMP(name.c_str(), b.name.c_str());
+      if (name_cmp == 0)
+        return parameters < b.parameters;
+      return name_cmp < 0;
+    }
+    return num_channels < b.num_channels;
+  }
+  return clockrate_hz < b.clockrate_hz;
+}
+
 void swap(SdpAudioFormat& a, SdpAudioFormat& b) {
   using std::swap;
   swap(a.name, b.name);
   swap(a.clockrate_hz, b.clockrate_hz);
   swap(a.num_channels, b.num_channels);
   swap(a.parameters, b.parameters);
 }
 
 std::ostream& operator<<(std::ostream& os, const SdpAudioFormat& saf) {
   os << "{name: " << saf.name;
   os << ", clockrate_hz: " << saf.clockrate_hz;
   os << ", num_channels: " << saf.num_channels;
   os << ", parameters: {";
   const char* sep = "";
   for (const auto& kv : saf.parameters) {
     os << sep << kv.first << ": " << kv.second;
     sep = ", ";
   }
   os << "}}";
   return os;
 }
 
 }  // namespace webrtc