chromium/src/third_party/blink/renderer/modules/mediastream/user_media_controller.cc

/*
 * 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
 *     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 "third_party/blink/renderer/modules/mediastream/user_media_controller.h"

namespace blink {

const char UserMediaController::kSupplementName[] = "UserMediaController";

UserMediaController* UserMediaController::From(LocalDOMWindow* window) {
  auto* controller =
      Supplement<LocalDOMWindow>::From<UserMediaController>(window);
  if (!controller) {
    controller = MakeGarbageCollected<UserMediaController>(window);
    Supplement<LocalDOMWindow>::ProvideTo(*window, controller);
  }
  return controller;
}

UserMediaController::UserMediaController(LocalDOMWindow* window)
    : Supplement<LocalDOMWindow>(*window),
      ExecutionContextLifecycleObserver(window) {}

void UserMediaController::Trace(Visitor* visitor) const {
  Supplement<LocalDOMWindow>::Trace(visitor);
  ExecutionContextLifecycleObserver::Trace(visitor);
  visitor->Trace(client_);
}

UserMediaClient* UserMediaController::Client() {
  auto* window = To<LocalDOMWindow>(GetExecutionContext());
  if (!client_ && window) {
    DCHECK(window->GetFrame());
    client_ = MakeGarbageCollected<UserMediaClient>(
        window->GetFrame(), window->GetTaskRunner(TaskType::kInternalMedia));
  }

  return client_;
}

void UserMediaController::ContextDestroyed() {
  if (!client_)
    return;
  client_->ContextDestroyed();
}

}  // namespace blink