Image Capture: MediaStreamTrack::getCapabilities()

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
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "modules/mediastream/MediaStreamTrack.h"
 
+#include <memory>
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/events/Event.h"
 #include "core/frame/Deprecation.h"
+#include "modules/imagecapture/ImageCapture.h"
 #include "modules/mediastream/MediaConstraintsImpl.h"
 #include "modules/mediastream/MediaStream.h"
+#include "modules/mediastream/MediaTrackCapabilities.h"
 #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 kContentHintStringNone[] = "";
 static const char kContentHintStringAudioSpeech[] = "speech";
 static const char kContentHintStringAudioMusic[] = "music";
 static const char kContentHintStringVideoMotion[] = "motion";
 static const char kContentHintStringVideoDetail[] = "detail";
 }  // namespace
 
 MediaStreamTrack* MediaStreamTrack::create(ExecutionContext* context,
                                            MediaStreamComponent* component) {
   return new MediaStreamTrack(context, component);
 }
 
 MediaStreamTrack::MediaStreamTrack(ExecutionContext* context,
                                    MediaStreamComponent* component)
     : ContextLifecycleObserver(context),
       m_readyState(MediaStreamSource::ReadyStateLive),
       m_isIteratingRegisteredMediaStreams(false),
       m_stopped(false),
       m_component(component),
       // The source's constraints aren't yet initialized at creation time.
       m_constraints() {
   m_component->source()->addObserver(this);
+
+  if (m_component->source() &&
+      m_component->source()->type() == MediaStreamSource::TypeVideo) {
+    // ImageCapture::create() only throws if |this| track is not of video type.
+    NonThrowableExceptionState exceptionState;
+    m_imageCapture = ImageCapture::create(context, this, exceptionState);
+  }
 }
 
 MediaStreamTrack::~MediaStreamTrack() {}
 
 String MediaStreamTrack::kind() const {
   DEFINE_STATIC_LOCAL(String, audioKind, ("audio"));
   DEFINE_STATIC_LOCAL(String, videoKind, ("video"));
 
   switch (m_component->source()->type()) {
     case MediaStreamSource::TypeAudio:
@@ skipping 126 matching lines @@
 }
 
 void MediaStreamTrack::getConstraints(MediaTrackConstraints& constraints) {
   MediaConstraintsImpl::convertConstraints(m_constraints, constraints);
 }
 
 void MediaStreamTrack::setConstraints(const WebMediaConstraints& constraints) {
   m_constraints = constraints;
 }
 
+void MediaStreamTrack::getCapabilities(MediaTrackCapabilities& capabilities) {
+  if (m_imageCapture)
+    capabilities = m_imageCapture->getMediaTrackCapabilities();
+}
+
 void MediaStreamTrack::getSettings(MediaTrackSettings& settings) {
   WebMediaStreamTrack::Settings platformSettings;
   m_component->getSettings(platformSettings);
   if (platformSettings.hasFrameRate()) {
     settings.setFrameRate(platformSettings.frameRate);
   }
   if (platformSettings.hasWidth()) {
     settings.setWidth(platformSettings.width);
   }
   if (platformSettings.hasHeight()) {
@@ skipping 112 matching lines @@
   return EventTargetNames::MediaStreamTrack;
 }
 
 ExecutionContext* MediaStreamTrack::getExecutionContext() const {
   return ContextLifecycleObserver::getExecutionContext();
 }
 
 DEFINE_TRACE(MediaStreamTrack) {
   visitor->trace(m_registeredMediaStreams);
   visitor->trace(m_component);
+  visitor->trace(m_imageCapture);
   EventTargetWithInlineData::trace(visitor);
   ContextLifecycleObserver::trace(visitor);
 }
 
 }  // namespace blink