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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_
#define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_
#include <memory>
#include <string>
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/threading/sequence_bound.h"
#include "content/browser/media/capture/frame_sink_video_capture_device.h"
#include "content/browser/media/capture/web_contents_frame_tracker.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/global_routing_id.h"
#include "content/public/browser/web_contents_media_capture_id.h"
#include "media/capture/mojom/video_capture_types.mojom.h"
namespace content {
// Captures the displayed contents of a WebContents, producing a stream of video
// frames.
//
// Generally, Create() is called with a device ID string that contains
// information necessary for finding a WebContents instance. Thereafter, this
// capture device will capture from the frame sink corresponding to the main
// frame of the RenderFrameHost tree for that WebContents instance. As the
// RenderFrameHost tree mutates (e.g., due to page navigations, crashes, or
// reloads), capture will continue without interruption.
class CONTENT_EXPORT WebContentsVideoCaptureDevice
: public FrameSinkVideoCaptureDevice {
public:
explicit WebContentsVideoCaptureDevice(const GlobalRenderFrameHostId& id);
WebContentsVideoCaptureDevice(WebContentsVideoCaptureDevice&&) = delete;
WebContentsVideoCaptureDevice(const WebContentsVideoCaptureDevice&) = delete;
WebContentsVideoCaptureDevice& operator=(
const WebContentsVideoCaptureDevice&&) = delete;
WebContentsVideoCaptureDevice& operator=(
const WebContentsVideoCaptureDevice&) = delete;
~WebContentsVideoCaptureDevice() override;
// Creates a WebContentsVideoCaptureDevice instance from the given
// |device_id|. Returns null if |device_id| is invalid.
static std::unique_ptr<WebContentsVideoCaptureDevice> Create(
const std::string& device_id);
// VideoCaptureDevice overrides.
void ApplySubCaptureTarget(
media::mojom::SubCaptureTargetType type,
const base::Token& target,
uint32_t sub_capture_target_version,
base::OnceCallback<void(media::mojom::ApplySubCaptureTargetResult)>
callback) final;
// FrameSinkVideoConsumer overrides.
void OnFrameCaptured(
media::mojom::VideoBufferHandlePtr data,
media::mojom::VideoFrameInfoPtr info,
const gfx::Rect& content_rect,
mojo::PendingRemote<viz::mojom::FrameSinkVideoConsumerFrameCallbacks>
callbacks) final;
// VideoCaptureDevice overrides.
void OnUtilizationReport(media::VideoCaptureFeedback feedback) override;
// For testing, we need the ability to create a device without its tracker.
protected:
WebContentsVideoCaptureDevice();
private:
// FrameSinkVideoCaptureDevice overrides: These increment/decrement the
// WebContents's capturer count, which causes the embedder to be notified.
void WillStart() final;
void DidStop() final;
gfx::Size content_size_;
// A helper that runs on the UI thread to monitor changes to the
// RenderFrameHost tree during the lifetime of a WebContents instance, and
// posts notifications back to update the target frame sink.
base::SequenceBound<WebContentsFrameTracker> tracker_;
SEQUENCE_CHECKER(sequence_checker_);
// Used to dispense WeakPtrs for the WebContentsFrameTracker to use to post
// tasks to the VideoCaptureDevice.
base::WeakPtrFactory<WebContentsVideoCaptureDevice> weak_ptr_factory_{this};
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_VIDEO_CAPTURE_DEVICE_H_
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