Added a builtin audio decoder factory to the default PeerConnectionFactory constructor.

webrtc/api/peerconnectionfactory.cc

 /*
  *  Copyright 2004 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 67 matching lines @@
     return nullptr;
   }
   return PeerConnectionFactoryProxy::Create(signaling_thread, pc_factory);
 }
 
 PeerConnectionFactory::PeerConnectionFactory()
     : owns_ptrs_(true),
       wraps_current_thread_(false),
       network_thread_(rtc::Thread::CreateWithSocketServer().release()),
       worker_thread_(rtc::Thread::Create().release()),
-      signaling_thread_(rtc::Thread::Current()) {
+      signaling_thread_(rtc::Thread::Current()),
+      audio_decoder_factory_(CreateBuiltinAudioDecoderFactory()) {
   if (!signaling_thread_) {
     signaling_thread_ = rtc::ThreadManager::Instance()->WrapCurrentThread();
     wraps_current_thread_ = true;
   }
   network_thread_->Start();
   worker_thread_->Start();
 }
 
 PeerConnectionFactory::PeerConnectionFactory(
     rtc::Thread* network_thread,
@@ skipping 229 matching lines @@
 cricket::MediaEngineInterface* PeerConnectionFactory::CreateMediaEngine_w() {
   ASSERT(worker_thread_ == rtc::Thread::Current());
   return cricket::WebRtcMediaEngineFactory::Create(
       default_adm_.get(),
       audio_decoder_factory_,
       video_encoder_factory_.get(),
       video_decoder_factory_.get());
 }
 
 }  // namespace webrtc