Implement MediaStreamTrack contentHint skeleton.

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

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Ericsson AB. 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 25 matching lines @@
 #include "modules/mediastream/MediaTrackSettings.h"
 #include "modules/mediastream/UserMediaController.h"
 #include "platform/mediastream/MediaStreamCenter.h"
 #include "platform/mediastream/MediaStreamComponent.h"
 #include "public/platform/WebMediaStreamTrack.h"
 #include "wtf/Assertions.h"
 #include <memory>
 
 namespace blink {
 
+namespace {
+static const char contentHintStringNone[] = "";

[esprehn, 2016/12/09 02:30:09]

k prefix constants

[pbos, 2016/12/09 17:34:46]

Done.

+static const char contentHintStringAudioSpeech[] = "speech";
+static const char contentHintStringAudioMusic[] = "music";
+static const char contentHintStringVideoFluid[] = "fluid";
+static const char contentHintStringVideoDetailed[] = "detailed";
+}  // namespace
+
 MediaStreamTrack* MediaStreamTrack::create(ExecutionContext* context,
                                            MediaStreamComponent* component) {
   MediaStreamTrack* track = new MediaStreamTrack(context, component);
   track->suspendIfNeeded();
   return track;
 }
 
 MediaStreamTrack::MediaStreamTrack(ExecutionContext* context,
                                    MediaStreamComponent* component)
     : ActiveScriptWrappable(this),
@@ skipping 44 matching lines @@
 
   if (!ended())
     MediaStreamCenter::instance().didSetMediaStreamTrackEnabled(
         m_component.get());
 }
 
 bool MediaStreamTrack::muted() const {
   return m_component->muted();
 }
 
+String MediaStreamTrack::contentHint() const {
+  WebMediaStreamTrack::ContentHint hint = m_component->contentHint();
+  switch (hint) {
+    case WebMediaStreamTrack::ContentHint::None:
+      return contentHintStringNone;
+    case WebMediaStreamTrack::ContentHint::AudioSpeech:
+      return contentHintStringAudioSpeech;
+    case WebMediaStreamTrack::ContentHint::AudioMusic:
+      return contentHintStringAudioMusic;
+    case WebMediaStreamTrack::ContentHint::VideoFluid:
+      return contentHintStringVideoFluid;
+    case WebMediaStreamTrack::ContentHint::VideoDetailed:
+      return contentHintStringVideoDetailed;
+  }
+
+  NOTREACHED();
+  return String();
+}
+
+void MediaStreamTrack::setContentHint(const String& hint) {
+  WebMediaStreamTrack::ContentHint translatedHint =
+      WebMediaStreamTrack::ContentHint::None;
+  switch (m_component->source()->type()) {
+    case MediaStreamSource::TypeAudio:
+      if (hint == contentHintStringNone) {
+        translatedHint = WebMediaStreamTrack::ContentHint::None;
+      } else if (hint == contentHintStringAudioSpeech) {
+        translatedHint = WebMediaStreamTrack::ContentHint::AudioSpeech;
+      } else if (hint == contentHintStringAudioMusic) {
+        translatedHint = WebMediaStreamTrack::ContentHint::AudioMusic;
+      } else {
+        // TODO(pbos): Log warning?

[esprehn, 2016/12/09 02:30:09]

What does the spec say you should do with an invalid value?

[pbos, 2016/12/09 17:34:46]

Ignore, similar to enums. I put a comment in.

+        return;
+      }
+      break;
+    case MediaStreamSource::TypeVideo:
+      if (hint == contentHintStringNone) {
+        translatedHint = WebMediaStreamTrack::ContentHint::None;
+      } else if (hint == contentHintStringVideoFluid) {
+        translatedHint = WebMediaStreamTrack::ContentHint::VideoFluid;
+      } else if (hint == contentHintStringVideoDetailed) {
+        translatedHint = WebMediaStreamTrack::ContentHint::VideoDetailed;
+      } else {
+        // TODO(pbos): Log warning?

[esprehn, 2016/12/09 02:30:09]

ditto

[pbos, 2016/12/09 17:34:46]

Done.

+        return;
+      }
+  }
+
+  m_component->setContentHint(translatedHint);
+}
+
 bool MediaStreamTrack::remote() const {
   return m_component->source()->remote();
 }
 
 String MediaStreamTrack::readyState() const {
   if (ended())
     return "ended";
 
   switch (m_readyState) {
     case MediaStreamSource::ReadyStateLive:
@@ skipping 134 matching lines @@
 }
 
 DEFINE_TRACE(MediaStreamTrack) {
   visitor->trace(m_registeredMediaStreams);
   visitor->trace(m_component);
   EventTargetWithInlineData::trace(visitor);
   ActiveDOMObject::trace(visitor);
 }
 
 }  // namespace blink