Added a level controller initialization value to MediaConstraints.

webrtc/api/localaudiosource.cc

 /*
  *  Copyright 2013 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 48 matching lines @@
   for (const auto& constraint : constraints) {
     bool value = false;
     if (!rtc::FromString(constraint.value, &value))
       continue;
 
     for (auto& entry : key_to_value) {
       if (constraint.key.compare(entry.name) == 0)
         entry.value = rtc::Optional<bool>(value);
     }
   }
+
+  std::string value;
+  if (constraints.FindFirst(
+          MediaConstraintsInterface::kLevelControlInitialPeakLevelDBFS,
+          &value)) {
+    float level_control_initial_peak_level_dbfs;
+    if (rtc::FromString(value, &level_control_initial_peak_level_dbfs)) {
+      options->level_control_initial_peak_level_dbfs =
+          rtc::Optional<float>(level_control_initial_peak_level_dbfs);
+    }
+  }

[aleloi, 2016/10/12 11:43:09]

I'm not sure about this. Maybe we should change the conversion algorithm
completely and have one solution for both boolean and non-boolean options?

[peah-webrtc, 2016/10/13 10:23:48]

I think it is fine to have them separated like this, but the variables for the
bool constraints should be renamed to reflect that the sets of constraints are
handled in different places.

[aleloi, 2016/10/13 10:30:47]

Acknowledged.

 }
 
 }  // namespace
 
 rtc::scoped_refptr<LocalAudioSource> LocalAudioSource::Create(
     const PeerConnectionFactoryInterface::Options& options,
     const MediaConstraintsInterface* constraints) {
   rtc::scoped_refptr<LocalAudioSource> source(
       new rtc::RefCountedObject<LocalAudioSource>());
   source->Initialize(options, constraints);
@@ skipping 27 matching lines @@
 void LocalAudioSource::Initialize(
     const PeerConnectionFactoryInterface::Options& options,
     const cricket::AudioOptions* audio_options) {
   if (!audio_options)
     return;
 
   options_ = *audio_options;
 }
 
 }  // namespace webrtc