| // 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. |
| // |
| // MessageFilter that handles video capture messages and delegates them to |
| // video captures. VideoCaptureMessageFilter is operated on IO thread of |
| // render process. It intercepts video capture messages and process them on |
| // IO thread since these messages are time critical. |
| |
| #ifndef CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_H_ |
| #define CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_H_ |
| |
| #include <map> |
| |
| #include "base/memory/shared_memory.h" |
| #include "base/message_loop/message_loop_proxy.h" |
| #include "content/common/content_export.h" |
| #include "content/common/media/video_capture.h" |
| #include "ipc/ipc_channel_proxy.h" |
| #include "media/video/capture/video_capture.h" |
| |
| namespace content { |
| |
| class CONTENT_EXPORT VideoCaptureMessageFilter |
| : public IPC::ChannelProxy::MessageFilter { |
| public: |
| class CONTENT_EXPORT Delegate { |
| public: |
| // Called when a video frame buffer is created in the browser process. |
| virtual void OnBufferCreated(base::SharedMemoryHandle handle, |
| int length, int buffer_id) = 0; |
| |
| // Called when a video frame buffer is received from the browser process. |
| virtual void OnBufferReceived(int buffer_id, base::Time timestamp) = 0; |
| |
| // Called when state of a video capture device has changed in the browser |
| // process. |
| virtual void OnStateChanged(VideoCaptureState state) = 0; |
| |
| // Called when device info is received from video capture device in the |
| // browser process. |
| virtual void OnDeviceInfoReceived( |
| const media::VideoCaptureParams& device_info) = 0; |
| |
| // Called when newly changed device info is received from video capture |
| // device in the browser process. |
| virtual void OnDeviceInfoChanged( |
| const media::VideoCaptureParams& device_info) {}; |
| |
| // Called when the delegate has been added to filter's delegate list. |
| // |device_id| is the device id for the delegate. |
| virtual void OnDelegateAdded(int32 device_id) = 0; |
| |
| protected: |
| virtual ~Delegate() {} |
| }; |
| |
| VideoCaptureMessageFilter(); |
| |
| // Add a delegate to the map. |
| void AddDelegate(Delegate* delegate); |
| |
| // Remove a delegate from the map. |
| void RemoveDelegate(Delegate* delegate); |
| |
| // Send a message asynchronously. |
| virtual bool Send(IPC::Message* message); |
| |
| // IPC::ChannelProxy::MessageFilter override. Called on IO thread. |
| virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; |
| virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE; |
| virtual void OnFilterRemoved() OVERRIDE; |
| virtual void OnChannelClosing() OVERRIDE; |
| |
| protected: |
| virtual ~VideoCaptureMessageFilter(); |
| |
| private: |
| FRIEND_TEST_ALL_PREFIXES(VideoCaptureMessageFilterTest, Basic); |
| FRIEND_TEST_ALL_PREFIXES(VideoCaptureMessageFilterTest, Delegates); |
| |
| typedef std::map<int32, Delegate*> Delegates; |
| |
| // Receive a newly created buffer from browser process. |
| void OnBufferCreated(int device_id, |
| base::SharedMemoryHandle handle, |
| int length, int buffer_id); |
| |
| // Receive a buffer from browser process. |
| void OnBufferReceived(int device_id, |
| int buffer_id, base::Time timestamp); |
| |
| // State of browser process' video capture device has changed. |
| void OnDeviceStateChanged(int device_id, VideoCaptureState state); |
| |
| // Receive device info from browser process. |
| void OnDeviceInfoReceived(int device_id, |
| const media::VideoCaptureParams& params); |
| |
| // Finds the delegate associated with |device_id|, NULL if not found. |
| Delegate* find_delegate(int device_id) const; |
| |
| // A map of device ids to delegates. |
| Delegates delegates_; |
| Delegates pending_delegates_; |
| int32 last_device_id_; |
| |
| IPC::Channel* channel_; |
| |
| scoped_refptr<base::MessageLoopProxy> message_loop_proxy_; |
| |
| DISALLOW_COPY_AND_ASSIGN(VideoCaptureMessageFilter); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_H_ |