Add a ChromeOS implementation of VideoCaptureDevice

media/video/capture/linux/video_capture_device_linux.h

 // Copyright (c) 2012 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.
 
 // Linux specific implementation of VideoCaptureDevice.
 // V4L2 is used for capturing. V4L2 does not provide its own thread for
 // capturing so this implementation uses a Chromium thread for fetching frames
 // from V4L2.
 
 #ifndef MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
 #define MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/files/scoped_file.h"
 #include "base/threading/thread.h"
 #include "media/video/capture/video_capture_device.h"
 #include "media/video/capture/video_capture_types.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/display_observer.h"
 
 namespace media {
 
-class VideoCaptureDeviceLinux : public VideoCaptureDevice {
+class VideoCaptureDeviceLinux : public gfx::DisplayObserver,
+                                public VideoCaptureDevice {
  public:
   explicit VideoCaptureDeviceLinux(const Name& device_name);
   virtual ~VideoCaptureDeviceLinux();
 
   // VideoCaptureDevice implementation.
   virtual void AllocateAndStart(const VideoCaptureParams& params,
                                 scoped_ptr<Client> client) OVERRIDE;
 
   virtual void StopAndDeAllocate() OVERRIDE;
 
  private:
   enum InternalState {
     kIdle,  // The device driver is opened but camera is not in use.
     kCapturing,  // Video is being captured.
     kError  // Error accessing HW functions.
             // User needs to recover by destroying the object.
   };
 
   // Buffers used to receive video frames from with v4l2.
   struct Buffer {
     Buffer() : start(0), length(0) {}
     void* start;
     size_t length;
   };
 
+  // gfx::DisplayObserver:
+  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
+  virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
+  virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
+
+  // Once v4l2_thread_ is started, only called on that thread.

[mcasas, 2014/05/09 10:32:16]

|v4l2_thread_|

+  void SetDisplayRotation(const gfx::Display& display);
+
   // Called on the v4l2_thread_.
   void OnAllocateAndStart(int width,
                           int height,
                           int frame_rate,
                           scoped_ptr<Client> client);
   void OnStopAndDeAllocate();
   void OnCaptureTask();
 
   bool AllocateVideoBuffers();
   void DeAllocateVideoBuffers();
   void SetErrorState(const std::string& reason);
 
   InternalState state_;
   scoped_ptr<VideoCaptureDevice::Client> client_;
   Name device_name_;
   base::ScopedFD device_fd_;  // File descriptor for the opened camera device.
   base::Thread v4l2_thread_;  // Thread used for reading data from the device.
   Buffer* buffer_pool_;
   int buffer_pool_size_;  // Number of allocated buffers.
   int timeout_count_;
   VideoCaptureFormat capture_format_;
+  gfx::Display::Rotation display_rotation_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_LINUX_VIDEO_CAPTURE_DEVICE_LINUX_H_