Surface the IntelligibilityEnhancer on MediaConstraints

webrtc/media/engine/webrtcvoiceengine.cc

 /*
  *  Copyright (c) 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 825 matching lines @@
 
   if (options.experimental_ns) {
     experimental_ns_ = options.experimental_ns;
   }
   if (experimental_ns_) {
     LOG(LS_INFO) << "Experimental ns is enabled? " << *experimental_ns_;
     config.Set<webrtc::ExperimentalNs>(
         new webrtc::ExperimentalNs(*experimental_ns_));
   }
 
+  const bool intelligibility_enhancer = adm()->IntelligibilityIsEnabled();

[the sun, 2016/05/06 09:00:15]

Is the idea to pass the option to enable IE via the ADM? Why not pass it through
the regular AudioOptions?

The ADM should be a wrapper for actual hardware resources.

[aluebs-webrtc, 2016/05/06 16:27:10]

Because I was pointed to the WebRtcAudioUtils API as to where this should be
enabled I found the AudioDevice to be the natural path, but I agree that it is
not intuitive. On the other hand I couldn't find a simple way to use the
AudioOptions with that API. But that is why I am asking for your feedback early.
I am happy to implement any other path you suggest.

+  LOG(LS_INFO) << "Intelligibility Enhancer is enabled? "
+               << intelligibility_enhancer;
+  config.Set<webrtc::Intelligibility>(
+      new webrtc::Intelligibility(intelligibility_enhancer));
+
   // We check audioproc for the benefit of tests, since FakeWebRtcVoiceEngine
   // returns NULL on audio_processing().
   webrtc::AudioProcessing* audioproc = voe_wrapper_->base()->audio_processing();
   if (audioproc) {
     audioproc->SetExtraOptions(config);
   }
 
   if (options.recording_sample_rate) {
     LOG(LS_INFO) << "Recording sample rate is "
                  << *options.recording_sample_rate;
@@ skipping 1700 matching lines @@
     }
   } else {
     LOG(LS_INFO) << "Stopping playout for channel #" << channel;
     engine()->voe()->base()->StopPlayout(channel);
   }
   return true;
 }
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VOICE