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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QAVFVIDEODEVICES_H
#define QAVFVIDEODEVICES_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtMultimedia/private/qplatformvideodevices_p.h>
#include <QtCore/private/qcore_mac_p.h>
#include <QtMultimedia/private/qavfcamerautility_p.h>
#include <QtMultimedia/qtmultimediaexports.h>
#include <functional>
#include <vector>
#import <AVFoundation/AVCaptureDevice.h>
QT_BEGIN_NAMESPACE
class QPlatformMediaIntegration;
// This class is always moved to the main-thread upon construction.
// All changes and events happens on the main-thread.
class Q_MULTIMEDIA_EXPORT QAVFVideoDevices : public QPlatformVideoDevices
{
public:
// Takes a delegate to check whether a given CvPixelFormat is supported for a capture session.
// If given a nullptr, it assumes all formats are supported.
QAVFVideoDevices(
QPlatformMediaIntegration *integration,
std::function<bool(uint32_t)> &&isCvPixelFormatSupportedDelegate = nullptr);
~QAVFVideoDevices();
// Returns true if the given CvPixelFormat is supported for camera capture session.
[[nodiscard]] bool isCvPixelFormatSupported(uint32_t cvPixelFormat) const;
protected:
QList<QCameraDevice> findVideoInputs() const override;
private:
void onAvCaptureDevicesChanged();
private:
// In rare cases, m_avDiscoverySession may be null. See QTBUG-144218.
AVFScopedPointer<AVCaptureDeviceDiscoverySession> m_avDiscoverySession;
// Note: Observer holds weak ref to AVCaptureDeviceDiscoverySession, and must
// be destroyed before AVCaptureDeviceDiscoverySession.
QMacKeyValueObserver m_avDiscoverySessionObserver;
std::function<bool(uint32_t)> m_isCvPixelFormatSupportedDelegate;
// We need to key-value observe the "suspended" value of all connected
// AVCaptureDevices in order to determine whether they should be exposed as
// QCameraDevice to the user.
struct ObservedAVCaptureDevice {
AVFScopedPointer<AVCaptureDevice> avCaptureDevice;
// Note: Observer holds weak ref to avCaptureDevice, and must
// be destroyed before avCaptureDevice.
QMacKeyValueObserver observer;
};
void rebuildObserveredAvCaptureDevices();
// All modifications and read of m_observedAvCaptureDevices happen by
// posting jobs the QAVFVideoDevices' thread, and so this doesn't need a
// lock.
std::vector<ObservedAVCaptureDevice> m_observedAvCaptureDevices;
};
QT_END_NAMESPACE
#endif