Let Contraints Controll Mute/Unmute Audio Local Playback For Desktop Sharing

third_party/WebKit/Source/modules/mediastream/MediaConstraintsImpl.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 65 matching lines @@
 const char kMinAspectRatio[] = "minAspectRatio";
 const char kMaxAspectRatio[] = "maxAspectRatio";
 const char kMaxWidth[] = "maxWidth";
 const char kMinWidth[] = "minWidth";
 const char kMaxHeight[] = "maxHeight";
 const char kMinHeight[] = "minHeight";
 const char kMaxFrameRate[] = "maxFrameRate";
 const char kMinFrameRate[] = "minFrameRate";
 // From content/common/media/media_stream_options.cc
 const char kMediaStreamSource[] = "chromeMediaSource";
+const char kMuteSourceAudio[] = "muteSourceAudio";

[miu, 2016/09/12 23:13:12]

In answer to your question: Yes, this does need the "goog" prefix if it's not
part of the W3C spec. (And, given my prior comments, I suggest naming it
"googDisableLocalEcho" or "googDisableLocalOutput".)

[qiangchen, 2016/09/13 21:46:57]

Done.

 const char kMediaStreamSourceId[] = "chromeMediaSourceId"; // mapped to deviceId
 const char kMediaStreamSourceInfoId[] = "sourceId"; // mapped to deviceId
 const char kMediaStreamRenderToAssociatedSink[] = "chromeRenderToAssociatedSink";
 // RenderToAssociatedSink will be going away in M50-M60 some time.
 const char kMediaStreamAudioHotword[] = "googHotword";
 // TODO(hta): googHotword should go away. https://crbug.com/577627
 // From content/renderer/media/media_stream_audio_processor_options.cc
 const char kEchoCancellation[] = "echoCancellation";
 const char kGoogEchoCancellation[] = "googEchoCancellation";
 const char kGoogExperimentalEchoCancellation[] = "googEchoCancellation2";
@@ skipping 191 matching lines @@
             result.frameRate.setMin(atof(constraint.m_value.utf8().c_str()));
         } else if (constraint.m_name.equals(kMaxFrameRate)) {
             result.frameRate.setMax(atof(constraint.m_value.utf8().c_str()));
         } else if (constraint.m_name.equals(kEchoCancellation)) {
             result.echoCancellation.setExact(toBoolean(constraint.m_value));
         } else if (constraint.m_name.equals(kMediaStreamSource)) {
             // TODO(hta): This has only a few legal values. Should be
             // represented as an enum, and cause type errors.
             // https://crbug.com/576582
             result.mediaStreamSource.setExact(constraint.m_value);
+        } else if (constraint.m_name.equals(kMuteSourceAudio)) {
+            result.muteSourceAudio.setExact(toBoolean(constraint.m_value));
         } else if (constraint.m_name.equals(kMediaStreamSourceId)
             || constraint.m_name.equals(kMediaStreamSourceInfoId)) {
             result.deviceId.setExact(constraint.m_value);
         } else if (constraint.m_name.equals(kMediaStreamRenderToAssociatedSink)) {
             // TODO(hta): This is a boolean represented as string.
             // Should give TypeError when it's not parseable.
             // https://crbug.com/576582
             result.renderToAssociatedSink.setExact(toBoolean(constraint.m_value));
         } else if (constraint.m_name.equals(kMediaStreamAudioHotword)) {
             result.hotwordEnabled.setExact(toBoolean(constraint.m_value));
@@ skipping 458 matching lines @@
         MediaTrackConstraintSet element;
         convertConstraintSet(it, element);
         advancedVector.append(element);
     }
     if (!advancedVector.isEmpty())
         output.setAdvanced(advancedVector);
 }
 
 } // namespace MediaConstraintsImpl
 } // namespace blink