| // 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 THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MODULES_VIDEO_CAPTURE_WEB_VIDEO_CAPTURE_IMPL_MANAGER_H_ |
| #define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MODULES_VIDEO_CAPTURE_WEB_VIDEO_CAPTURE_IMPL_MANAGER_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/single_thread_task_runner.h" |
| #include "base/synchronization/lock.h" |
| #include "base/threading/thread_checker.h" |
| #include "media/capture/video_capture_types.h" |
| #include "third_party/blink/public/common/media/video_capture.h" |
| #include "third_party/blink/public/common/mediastream/media_stream_request.h" |
| #include "third_party/blink/public/platform/web_common.h" |
| #include "third_party/blink/public/platform/web_vector.h" |
| |
| namespace blink { |
| |
| class VideoCaptureImpl; |
| class WebString; |
| |
| // TODO(hclam): This class should be renamed to VideoCaptureService. |
| |
| // This class provides access to a video capture device in the browser |
| // process through IPC. The main function is to deliver video frames |
| // to a client. |
| // |
| // THREADING |
| // |
| // WebVideoCaptureImplManager lives only on the Render Main thread. All methods |
| // must be called on this thread. |
| // |
| // VideoFrames are delivered on the IO thread. Callbacks provided by |
| // a client are also called on the IO thread. |
| class BLINK_PLATFORM_EXPORT WebVideoCaptureImplManager { |
| public: |
| WebVideoCaptureImplManager(); |
| virtual ~WebVideoCaptureImplManager(); |
| |
| // Open a device associated with the session ID. |
| // This method must be called before any methods with the same ID |
| // is used. |
| // Returns a callback that should be used to release the acquired |
| // resources. |
| base::OnceClosure UseDevice(const media::VideoCaptureSessionId& id); |
| |
| // Start receiving video frames for the given session ID. |
| // |
| // |state_update_cb| will be called on the IO thread when capturing |
| // state changes. |
| // States will be one of the following four: |
| // * VIDEO_CAPTURE_STATE_STARTED |
| // * VIDEO_CAPTURE_STATE_STOPPED |
| // * VIDEO_CAPTURE_STATE_PAUSED |
| // * VIDEO_CAPTURE_STATE_ERROR |
| // |
| // |deliver_frame_cb| will be called on the IO thread when a video |
| // frame is ready. |
| // |
| // Returns a callback that is used to stop capturing. Note that stopping |
| // video capture is not synchronous. Client should handle the case where |
| // callbacks are called after capturing is instructed to stop, typically |
| // by binding the passed callbacks on a WeakPtr. |
| base::OnceClosure StartCapture( |
| const media::VideoCaptureSessionId& id, |
| const media::VideoCaptureParams& params, |
| const VideoCaptureStateUpdateCB& state_update_cb, |
| const VideoCaptureDeliverFrameCB& deliver_frame_cb); |
| |
| // Requests that the video capturer send a frame "soon" (e.g., to resolve |
| // picture loss or quality issues). |
| void RequestRefreshFrame(const media::VideoCaptureSessionId& id); |
| |
| // Requests frame delivery be suspended/resumed for a given capture session. |
| void Suspend(const media::VideoCaptureSessionId& id); |
| void Resume(const media::VideoCaptureSessionId& id); |
| |
| // Get supported formats supported by the device for the given session |
| // ID. |callback| will be called on the IO thread. |
| void GetDeviceSupportedFormats(const media::VideoCaptureSessionId& id, |
| VideoCaptureDeviceFormatsCB callback); |
| |
| // Get supported formats currently in use for the given session ID. |
| // |callback| will be called on the IO thread. |
| void GetDeviceFormatsInUse(const media::VideoCaptureSessionId& id, |
| VideoCaptureDeviceFormatsCB callback); |
| |
| // Make all VideoCaptureImpl instances in the input |video_devices| |
| // stop/resume delivering video frames to their clients, depends on flag |
| // |suspend|. This is called in response to a RenderView-wide |
| // PageHidden/Shown() event. |
| // To suspend/resume an individual session, please call Suspend(id) or |
| // Resume(id). |
| void SuspendDevices(const MediaStreamDevices& video_devices, bool suspend); |
| |
| void OnLog(const media::VideoCaptureSessionId& id, const WebString& message); |
| void OnFrameDropped(const media::VideoCaptureSessionId& id, |
| media::VideoCaptureFrameDropReason reason); |
| |
| virtual std::unique_ptr<VideoCaptureImpl> CreateVideoCaptureImplForTesting( |
| const media::VideoCaptureSessionId& session_id) const; |
| |
| // Get the feedback callback for the corresponding capture session. |
| // Consumers may call the returned callback in any thread to provide |
| // the capturer with feedback information. |
| VideoCaptureFeedbackCB GetFeedbackCallback( |
| const media::VideoCaptureSessionId& id) const; |
| |
| private: |
| // Holds bookkeeping info for each VideoCaptureImpl shared by clients. |
| struct DeviceEntry; |
| |
| static void ProcessFeedback(VideoCaptureFeedbackCB callback_to_io_thread, |
| const media::VideoFrameFeedback& feedback); |
| |
| void ProcessFeedbackInternal(const media::VideoCaptureSessionId& id, |
| const media::VideoFrameFeedback& feedback); |
| |
| void StopCapture(int client_id, const media::VideoCaptureSessionId& id); |
| void UnrefDevice(const media::VideoCaptureSessionId& id); |
| |
| // Devices currently in use. |
| WebVector<DeviceEntry> devices_; |
| |
| // This is an internal ID for identifying clients of VideoCaptureImpl. |
| // The ID is global for the render process. |
| int next_client_id_; |
| |
| // Hold a pointer to the Render Main message loop to check we operate on the |
| // right thread. |
| const scoped_refptr<base::SingleThreadTaskRunner> render_main_task_runner_; |
| |
| // Set to true if SuspendDevices(true) was called. This, along with |
| // DeviceEntry::is_individually_suspended, is used to determine whether to |
| // take action when suspending/resuming each device. |
| bool is_suspending_all_; |
| |
| // Bound to the render thread. |
| // NOTE: Weak pointers must be invalidated before all other member variables. |
| base::WeakPtrFactory<WebVideoCaptureImplManager> weak_factory_{this}; |
| |
| DISALLOW_COPY_AND_ASSIGN(WebVideoCaptureImplManager); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_PUBLIC_PLATFORM_MODULES_VIDEO_CAPTURE_WEB_VIDEO_CAPTURE_IMPL_MANAGER_H_ |