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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
      7 
      8 #include "base/memory/shared_memory.h"
      9 #include "base/time/time.h"
     10 #include "content/common/content_export.h"
     11 
     12 namespace gpu {
     13 struct MailboxHolder;
     14 }  // namespace gpu
     15 
     16 namespace media {
     17 class VideoCaptureFormat;
     18 }  // namespace media
     19 
     20 namespace content {
     21 
     22 // ID used for identifying an object of VideoCaptureController.
     23 struct CONTENT_EXPORT VideoCaptureControllerID {
     24   explicit VideoCaptureControllerID(int device_id);
     25 
     26   bool operator<(const VideoCaptureControllerID& vc) const;
     27   bool operator==(const VideoCaptureControllerID& vc) const;
     28 
     29   int device_id;
     30 };
     31 
     32 // VideoCaptureControllerEventHandler is the interface for
     33 // VideoCaptureController to notify clients about the events such as
     34 // BufferReady, FrameInfo, Error, etc.
     35 class CONTENT_EXPORT VideoCaptureControllerEventHandler {
     36  public:
     37   // An Error has occurred in the VideoCaptureDevice.
     38   virtual void OnError(const VideoCaptureControllerID& id) = 0;
     39 
     40   // A buffer has been newly created.
     41   virtual void OnBufferCreated(const VideoCaptureControllerID& id,
     42                                base::SharedMemoryHandle handle,
     43                                int length,
     44                                int buffer_id) = 0;
     45 
     46   // A previously created buffer has been freed and will no longer be used.
     47   virtual void OnBufferDestroyed(const VideoCaptureControllerID& id,
     48                                  int buffer_id) = 0;
     49 
     50   // A buffer has been filled with I420 video.
     51   virtual void OnBufferReady(const VideoCaptureControllerID& id,
     52                              int buffer_id,
     53                              const media::VideoCaptureFormat& format,
     54                              base::TimeTicks timestamp) = 0;
     55 
     56   // A texture mailbox buffer has been filled with data.
     57   virtual void OnMailboxBufferReady(const VideoCaptureControllerID& id,
     58                                     int buffer_id,
     59                                     const gpu::MailboxHolder& mailbox_holder,
     60                                     const media::VideoCaptureFormat& format,
     61                                     base::TimeTicks timestamp) = 0;
     62 
     63   // The capture session has ended and no more frames will be sent.
     64   virtual void OnEnded(const VideoCaptureControllerID& id) = 0;
     65 
     66  protected:
     67   virtual ~VideoCaptureControllerEventHandler() {}
     68 };
     69 
     70 }  // namespace content
     71 
     72 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_EVENT_HANDLER_H_
     73