| // 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 "content/common/content_export.h" |
| #include "content/common/media/video_capture.h" |
| #include "ipc/message_filter.h" |
| #include "media/video/capture/video_capture_types.h" |
| |
| namespace gpu { |
| struct MailboxHolder; |
| } // namespace gpu |
| |
| namespace content { |
| |
| class CONTENT_EXPORT VideoCaptureMessageFilter : public IPC::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; |
| |
| virtual void OnBufferDestroyed(int buffer_id) = 0; |
| |
| // Called when a video frame buffer is received from the browser process. |
| virtual void OnBufferReceived(int buffer_id, |
| const media::VideoCaptureFormat& format, |
| base::TimeTicks timestamp) = 0; |
| |
| // Called when a video mailbox buffer is received from the browser process. |
| virtual void OnMailboxBufferReceived( |
| int buffer_id, |
| const gpu::MailboxHolder& mailbox_holder, |
| const media::VideoCaptureFormat& format, |
| base::TimeTicks timestamp) = 0; |
| |
| // Called when state of a video capture device has changed in the browser |
| // process. |
| virtual void OnStateChanged(VideoCaptureState state) = 0; |
| |
| // Called upon reception of device's supported formats back from browser. |
| virtual void OnDeviceSupportedFormatsEnumerated( |
| const media::VideoCaptureFormats& supported_formats) = 0; |
| |
| // Called upon reception of format(s) in use by a device back from browser. |
| virtual void OnDeviceFormatsInUseReceived( |
| const media::VideoCaptureFormats& formats_in_use) = 0; |
| |
| // 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::MessageFilter override. Called on IO thread. |
| virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; |
| virtual void OnFilterAdded(IPC::Sender* sender) OVERRIDE; |
| virtual void OnFilterRemoved() OVERRIDE; |
| virtual void OnChannelClosing() OVERRIDE; |
| |
| protected: |
| virtual ~VideoCaptureMessageFilter(); |
| |
| private: |
| 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); |
| |
| // Release a buffer received by OnBufferCreated. |
| void OnBufferDestroyed(int device_id, |
| int buffer_id); |
| |
| // Receive a filled buffer from browser process. |
| void OnBufferReceived(int device_id, |
| int buffer_id, |
| const media::VideoCaptureFormat& format, |
| base::TimeTicks timestamp); |
| |
| // Receive a filled texture mailbox buffer from browser process. |
| void OnMailboxBufferReceived(int device_id, |
| int buffer_id, |
| const gpu::MailboxHolder& mailbox_holder, |
| const media::VideoCaptureFormat& format, |
| base::TimeTicks timestamp); |
| |
| // State of browser process' video capture device has changed. |
| void OnDeviceStateChanged(int device_id, VideoCaptureState state); |
| |
| // Receive a device's supported formats back from browser process. |
| void OnDeviceSupportedFormatsEnumerated( |
| int device_id, |
| const media::VideoCaptureFormats& supported_formats); |
| |
| // Receive the formats in-use by a device back from browser process. |
| void OnDeviceFormatsInUseReceived( |
| int device_id, |
| const media::VideoCaptureFormats& formats_in_use); |
| |
| // 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::Sender* sender_; |
| |
| DISALLOW_COPY_AND_ASSIGN(VideoCaptureMessageFilter); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_RENDERER_MEDIA_VIDEO_CAPTURE_MESSAGE_FILTER_H_ |