Viewfinder settings control (2) - version for iOS/OS X

QCameraViewfinderSettingsControl2 - version for AV foundation plugin
(the new settings control interface implemented).

Change-Id: I3fbfb87925e57c914d43eb711fa5422e26981207
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/plugins/avfoundation/camera/avfcameraviewfindersettingscontrol.h

@@ -0,0 +1,91 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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+****************************************************************************/
+
+#ifndef AVFCAMERAVIEWFINDERSETTINGSCONTROL_H
+#define AVFCAMERAVIEWFINDERSETTINGSCONTROL_H
+
+#include <QtMultimedia/qcameraviewfindersettingscontrol.h>
+#include <QtMultimedia/qcameraviewfindersettings.h>
+#include <QtMultimedia/qvideoframe.h>
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qsize.h>
+
+@class AVCaptureDevice;
+@class AVCaptureVideoDataOutput;
+@class AVCaptureConnection;
+@class AVCaptureDeviceFormat;
+
+QT_BEGIN_NAMESPACE
+
+class AVFCameraSession;
+class AVFCameraService;
+
+class AVFCameraViewfinderSettingsControl2 : public QCameraViewfinderSettingsControl2
+{
+    Q_OBJECT
+
+    friend class AVFCameraSession;
+public:
+    AVFCameraViewfinderSettingsControl2(AVFCameraService *service);
+
+    QList<QCameraViewfinderSettings> supportedViewfinderSettings() const Q_DECL_OVERRIDE;
+    QCameraViewfinderSettings viewfinderSettings() const Q_DECL_OVERRIDE;
+    void setViewfinderSettings(const QCameraViewfinderSettings &settings) Q_DECL_OVERRIDE;
+
+    // "Converters":
+    static QVideoFrame::PixelFormat QtPixelFormatFromCVFormat(unsigned avPixelFormat);
+    static bool CVPixelFormatFromQtFormat(QVideoFrame::PixelFormat qtFormat, unsigned &conv);
+
+private:
+    void setResolution(const QSize &resolution);
+    void setFramerate(qreal minFPS, qreal maxFPS, bool useActive);
+    void setPixelFormat(QVideoFrame::PixelFormat newFormat);
+    AVCaptureDeviceFormat *findBestFormatMatch(const QCameraViewfinderSettings &settings) const;
+    bool convertPixelFormatIfSupported(QVideoFrame::PixelFormat format, unsigned &avfFormat) const;
+    void applySettings();
+    QCameraViewfinderSettings requestedSettings() const;
+    // Aux. function to extract things like captureDevice, videoOutput, etc.
+    bool updateAVFoundationObjects() const;
+
+    AVFCameraService *m_service;
+    mutable AVFCameraSession *m_session;
+    QCameraViewfinderSettings m_settings;
+    mutable AVCaptureDevice *m_captureDevice;
+    mutable AVCaptureVideoDataOutput *m_videoOutput;
+    mutable AVCaptureConnection *m_videoConnection;
+};
+
+QT_END_NAMESPACE
+
+#endif