All together now

content/browser/renderer_host/media/desktop_capture_device_aura.h

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_DESKTOP_CAPTURE_DEVICE_AURA_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_DESKTOP_CAPTURE_DEVICE_AURA_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread_checker.h"
+#include "content/browser/renderer_host/media/video_capture_oracle.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/common/desktop_media_id.h"
+#include "media/video/capture/video_capture_device.h"
+
+namespace gfx {
+class Display;
+}
+
+namespace ui {
+class Compositor;
+}
+
+namespace content {
+
+// A VideoCaptureDevice that mirrors the displayed contents of an Ash browser
+// compositor, producing a stream of video frames.
+class CONTENT_EXPORT DesktopCaptureDeviceAura
+    : public media::VideoCaptureDevice {
+ public:
+  static media::VideoCaptureDevice* Create(const DesktopMediaID& source);
+  virtual ~DesktopCaptureDeviceAura();
+
+  // media::VideoCaptureDevice implementation.
+  virtual void Allocate(const media::VideoCaptureCapability& capture_format,
+                        VideoCaptureDevice::EventHandler* consumer) OVERRIDE;
+  virtual void Start() OVERRIDE;
+  virtual void Stop() OVERRIDE;
+  virtual void DeAllocate() OVERRIDE;
+  virtual const Name& device_name() OVERRIDE;
+
+  // Report an error and go to error state.
+  void ReportError();
+
+ private:
+  enum State {
+    kIdle,
+    kAllocated,
+    kCapturing,
+    kError,
+  };
+
+  class Impl;
+
+  explicit DesktopCaptureDeviceAura(const Name& device_name);
+
+  const base::ThreadChecker thread_checker_;
+  const Name device_name_;
+  State state_;
+
+  // Weak factory and pointer for posting tasks back to this object on the
+  // device_thread_.  Outstanding pointers are invalidated on DeAllocate().
+  base::WeakPtrFactory<DesktopCaptureDeviceAura> weak_ptr_factory_;
+
+  scoped_refptr<Impl> impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopCaptureDeviceAura);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_DESKTOP_CAPTURE_DEVICE_AURA_H_