text: // 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.
  
  #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
  #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
  
  #include "base/shared_memory.h"
  #include "base/time.h"
  #include "content/common/content_export.h"
  
  namespace content {
  
  // ID used for identifying an object of VideoCaptureController.
  struct CONTENT_EXPORT VideoCaptureControllerID {
    explicit VideoCaptureControllerID(int device_id);
  
    bool operator<(const VideoCaptureControllerID& vc) const;
    bool operator==(const VideoCaptureControllerID& vc) const;
  
    int device_id;
  };
  
  // VideoCaptureControllerEventHandler is the interface for
  // VideoCaptureController to notify clients about the events such as
  // BufferReady, FrameInfo, Error, etc.
  class CONTENT_EXPORT VideoCaptureControllerEventHandler {
   public:
    // An Error has occurred in the VideoCaptureDevice.
    virtual void OnError(const VideoCaptureControllerID& id) = 0;
  
    // A buffer has been newly created.
    virtual void OnBufferCreated(const VideoCaptureControllerID& id,
                                 base::SharedMemoryHandle handle,
                                 int length, int buffer_id) = 0;
  
    // A buffer has been filled with I420 video.
    virtual void OnBufferReady(const VideoCaptureControllerID& id,
                               int buffer_id,
                               base::Time timestamp) = 0;
  
    // The frame resolution the VideoCaptureDevice capture video in.
    virtual void OnFrameInfo(const VideoCaptureControllerID& id,
                             int width,
                             int height,
                             int frame_rate) = 0;
  
    // The capture session has ended and no more frames will be sent.
    virtual void OnEnded(const VideoCaptureControllerID& id) = 0;
  
   protected:
    virtual ~VideoCaptureControllerEventHandler() {}
  };
  
  }  // namespace content
  
  #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
  