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// Copyright 2022 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 CONTENT_BROWSER_MEDIA_CAPTURE_IO_SURFACE_CAPTURE_DEVICE_BASE_MAC_H_
#define CONTENT_BROWSER_MEDIA_CAPTURE_IO_SURFACE_CAPTURE_DEVICE_BASE_MAC_H_
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "content/common/content_export.h"
#include "media/capture/video/video_capture_device.h"
#include "ui/gfx/mac/io_surface.h"
namespace content {
// Common base class for the shared functionality of the two classes that
// capture frames as IOSurfaces, DesktopCaptureDeviceMac and
// ScreenCaptureKitDeviceMac.
class CONTENT_EXPORT IOSurfaceCaptureDeviceBase
: public media::VideoCaptureDevice {
public:
IOSurfaceCaptureDeviceBase();
~IOSurfaceCaptureDeviceBase() override;
// OnStart is called by AllocateAndStart.
virtual void OnStart() = 0;
// OnStop is called by StopAndDeAllocate.
virtual void OnStop() = 0;
// media::VideoCaptureDevice overrides.
void RequestRefreshFrame() override;
protected:
void OnReceivedIOSurfaceFromStream(
gfx::ScopedInUseIOSurface io_surface,
const media::VideoCaptureFormat& capture_format);
void SendLastReceivedIOSurfaceToClient();
// Given a source frame size `source_size`, and `capture_params_`, compute the
// appropriate frame size and store it in `frame_size`. If custom letterboxing
// is to be performed, store the destination rectangle for the source content
// in `dest_rect_in_frame`.
void ComputeFrameSizeAndDestRect(const gfx::Size& source_size,
gfx::Size& frame_size,
gfx::RectF& dest_rect_in_frame) const;
Client* client() { return client_.get(); }
const media::VideoCaptureParams& capture_params() { return capture_params_; }
private:
// media::VideoCaptureDevice:
void AllocateAndStart(const media::VideoCaptureParams& params,
std::unique_ptr<Client> client) final;
void StopAndDeAllocate() final;
// This class assumes single threaded access.
THREAD_CHECKER(thread_checker_);
std::unique_ptr<Client> client_;
// The parameters that were specified to AllocateAndStart.
media::VideoCaptureParams capture_params_;
// The time of the first call to SendLastReceivedIOSurfaceToClient. Used to
// compute the timestamp of subsequent frames.
base::TimeTicks first_frame_time_;
// The most recent arguments to OnReceivedIOSurfaceFromStream. If no other
// frames come in, then this will be repeatedly sent at `min_frame_rate_`.
gfx::ScopedInUseIOSurface last_received_io_surface_;
media::VideoCaptureFormat last_received_capture_format_;
base::WeakPtrFactory<IOSurfaceCaptureDeviceBase> weak_factory_base_{this};
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_CAPTURE_IO_SURFACE_CAPTURE_DEVICE_BASE_MAC_H_
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