Add AVF camera utilities - general aux. functions/classes

Move configuration lock class into avfutility.h + add several standalone functions to work with AVCaptureDeviceFormat/AVCaptureDevice etc. - utility functions that are not specific to any class. Change-Id: Idba544248772a3b2a4e00dddb377b1c0e62b8085 Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>
2015-02-20 09:43:39 +01:00
parent 5a0a3791a1
commit d27f493df0
6 changed files with 430 additions and 8 deletions
--- a/src/plugins/avfoundation/camera/avfcamerautility.h
+++ b/src/plugins/avfoundation/camera/avfcamerautility.h
@@ -0,0 +1,113 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef AVFCAMERAUTILITY_H
+#define AVFCAMERAUTILITY_H
+
+#include <QtCore/qsysinfo.h>
+#include <QtCore/qglobal.h>
+#include <QtCore/qvector.h>
+#include <QtCore/qdebug.h>
+#include <QtCore/qsize.h>
+#include <QtCore/qpair.h>
+
+#include <AVFoundation/AVFoundation.h>
+
+// In case we have SDK below 10.7/7.0:
+@class AVCaptureDeviceFormat;
+
+QT_BEGIN_NAMESPACE
+
+class AVFConfigurationLock
+{
+public:
+    explicit AVFConfigurationLock(AVCaptureDevice *captureDevice)
+        : m_captureDevice(captureDevice),
+          m_locked(false)
+    {
+        Q_ASSERT(m_captureDevice);
+        NSError *error = nil;
+        m_locked = [m_captureDevice lockForConfiguration:&error];
+    }
+
+    ~AVFConfigurationLock()
+    {
+        if (m_locked)
+            [m_captureDevice unlockForConfiguration];
+    }
+
+    operator bool() const
+    {
+        return m_locked;
+    }
+
+private:
+    Q_DISABLE_COPY(AVFConfigurationLock)
+
+    AVCaptureDevice *m_captureDevice;
+    bool m_locked;
+};
+
+inline QSysInfo::MacVersion qt_OS_limit(QSysInfo::MacVersion osxVersion,
+                                        QSysInfo::MacVersion iosVersion)
+{
+#ifdef Q_OS_OSX
+    Q_UNUSED(iosVersion)
+    return osxVersion;
+#else
+    Q_UNUSED(osxVersion)
+    return iosVersion;
+#endif
+}
+
+typedef QPair<qreal, qreal> AVFPSRange;
+AVFPSRange qt_connection_framerates(AVCaptureConnection *videoConnection);
+typedef QPair<int, int> AVFRational;
+AVFRational qt_float_to_rational(qreal par, int limit);
+
+#if QT_MAC_PLATFORM_SDK_EQUAL_OR_ABOVE(__MAC_10_7, __IPHONE_7_0)
+
+bool qt_is_video_range_subtype(AVCaptureDeviceFormat *format);
+QSize qt_device_format_resolution(AVCaptureDeviceFormat *format);
+QSize qt_device_format_high_resolution(AVCaptureDeviceFormat *format);
+QSize qt_device_format_pixel_aspect_ratio(AVCaptureDeviceFormat *format);
+QVector<AVFPSRange> qt_device_format_framerates(AVCaptureDeviceFormat *format);
+AVCaptureDeviceFormat *qt_find_best_resolution_match(AVCaptureDevice *captureDevice, const QSize &res);
+AVCaptureDeviceFormat *qt_find_best_framerate_match(AVCaptureDevice *captureDevice, Float64 fps);
+AVFrameRateRange *qt_find_supported_framerate_range(AVCaptureDeviceFormat *format, Float64 fps);
+
+#endif
+
+QT_END_NAMESPACE
+
+#endif