Image Capture: MediaStreamTrack::applyConstraints()

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

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
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  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
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  * 1.  Redistributions of source code must retain the above copyright
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 #include "modules/mediastream/MediaStreamTrack.h"
 
 #include <memory>
 #include "bindings/core/v8/ExceptionMessages.h"
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/dom/DOMException.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/MediaTrackConstraints.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"
 
 namespace blink {
 
 namespace {
@@ skipping 217 matching lines @@
       case WebMediaStreamTrack::FacingMode::Right:
         settings.setFacingMode("right");
         break;
       default:
         // None, or unknown facing mode. Ignore.
         break;
     }
   }
 }
 
+ScriptPromise MediaStreamTrack::applyConstraints(
+    ScriptState* scriptState,
+    const MediaTrackConstraints& constraints) {
+  ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
+  ScriptPromise promise = resolver->promise();
+
+  // |constraints| is an optional argument, which is strange.
+  // TODO(mcasas): remove this provision if |constraints| is not optional:
+  // https://github.com/w3c/mediacapture-main/issues/438
+  if (!constraints.hasAdvanced()) {
+    resolver->resolve();
+    return promise;
+  }
+
+  if (!m_imageCapture) {
+    resolver->reject(
+        DOMException::create(NotFoundError, "Image Capture not found"));

[Guido Urdaneta, 2017/03/17 00:30:27]

Change the error message to something like "Track type not currently supported"
or something like that. This method will eventually support other track types.

[mcasas, 2017/03/17 00:49:22]

Done.

+    return promise;
+  }
+
+  m_imageCapture->setMediaTrackConstraints(resolver, constraints.advanced()[0]);
+  return promise;
+}
+
 bool MediaStreamTrack::ended() const {
   return m_stopped || (m_readyState == MediaStreamSource::ReadyStateEnded);
 }
 
 void MediaStreamTrack::sourceChangedState() {
   if (ended())
     return;
 
   m_readyState = m_component->source()->getReadyState();
   switch (m_readyState) {
@@ skipping 71 matching lines @@
 
 DEFINE_TRACE(MediaStreamTrack) {
   visitor->trace(m_registeredMediaStreams);
   visitor->trace(m_component);
   visitor->trace(m_imageCapture);
   EventTargetWithInlineData::trace(visitor);
   ContextLifecycleObserver::trace(visitor);
 }
 
 }  // namespace blink