AVFCameraFocusControl - focus control for iOS / OS X

Camera focus control for AVFoundation plugin (iOS/OS X).

Change-Id: I0a79e7057ecbb66413debb8eac0f48ff679fc7ba
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/plugins/avfoundation/camera/avfcamerafocuscontrol.h

@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/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.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights. These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef AVFCAMERAFOCUSCONTROL_H
+#define AVFCAMERAFOCUSCONTROL_H
+
+#include <QtCore/qscopedpointer.h>
+#include <QtCore/qglobal.h>
+
+#include <qcamerafocuscontrol.h>
+
+@class AVCaptureDevice;
+
+QT_BEGIN_NAMESPACE
+
+class AVFCameraService;
+class AVFCameraSession;
+
+class AVFCameraFocusControl : public QCameraFocusControl
+{
+    Q_OBJECT
+public:
+    explicit AVFCameraFocusControl(AVFCameraService *service);
+
+    QCameraFocus::FocusModes focusMode() const Q_DECL_OVERRIDE;
+    void setFocusMode(QCameraFocus::FocusModes mode) Q_DECL_OVERRIDE;
+    bool isFocusModeSupported(QCameraFocus::FocusModes mode) const Q_DECL_OVERRIDE;
+
+    QCameraFocus::FocusPointMode focusPointMode() const Q_DECL_OVERRIDE;
+    void setFocusPointMode(QCameraFocus::FocusPointMode mode) Q_DECL_OVERRIDE;
+    bool isFocusPointModeSupported(QCameraFocus::FocusPointMode mode) const Q_DECL_OVERRIDE;
+    QPointF customFocusPoint() const Q_DECL_OVERRIDE;
+    void setCustomFocusPoint(const QPointF &point) Q_DECL_OVERRIDE;
+
+    QCameraFocusZoneList focusZones() const Q_DECL_OVERRIDE;
+
+private Q_SLOTS:
+    void cameraStateChanged();
+
+private:
+
+    AVFCameraSession *m_session;
+    QCameraFocus::FocusModes m_focusMode;
+    QCameraFocus::FocusPointMode m_focusPointMode;
+    QPointF m_customFocusPoint;
+    QPointF m_actualFocusPoint;
+};
+
+QT_END_NAMESPACE
+
+#endif // AVFCAMERAFOCUSCONTROL_H

src/plugins/avfoundation/camera/avfcamerafocuscontrol.mm

@@ -0,0 +1,300 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/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.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights. These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "avfcamerafocuscontrol.h"
+#include "avfconfigurationlock.h"
+#include "avfcameraservice.h"
+#include "avfcamerasession.h"
+#include "avfcameradebug.h"
+
+#include <QtCore/qdebug.h>
+
+#include <AVFoundation/AVFoundation.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace {
+
+bool qt_focus_mode_supported(QCameraFocus::FocusModes mode)
+{
+    // Check if QCameraFocus::FocusMode has counterpart in AVFoundation.
+
+    // AVFoundation has 'Manual', 'Auto' and 'Continuous',
+    // where 'Manual' is actually 'Locked' + writable property 'lensPosition'.
+    // Since Qt does not provide an API to manipulate a lens position, 'Maual' mode
+    // (at the moment) is not supported.
+    return mode == QCameraFocus::AutoFocus
+           || mode == QCameraFocus::ContinuousFocus;
+}
+
+bool qt_focus_point_mode_supported(QCameraFocus::FocusPointMode mode)
+{
+    return mode == QCameraFocus::FocusPointAuto
+           || mode == QCameraFocus::FocusPointCustom
+           || mode == QCameraFocus::FocusPointCenter;
+}
+
+AVCaptureFocusMode avf_focus_mode(QCameraFocus::FocusModes requestedMode)
+{
+    if (requestedMode == QCameraFocus::AutoFocus)
+        return AVCaptureFocusModeAutoFocus;
+
+    return AVCaptureFocusModeContinuousAutoFocus;
+}
+
+}
+
+AVFCameraFocusControl::AVFCameraFocusControl(AVFCameraService *service)
+    : m_session(service->session()),
+      m_focusMode(QCameraFocus::ContinuousFocus),
+      m_focusPointMode(QCameraFocus::FocusPointAuto),
+      m_customFocusPoint(0.5f, 0.5f),
+      m_actualFocusPoint(m_customFocusPoint)
+{
+    Q_ASSERT(m_session);
+    connect(m_session, SIGNAL(stateChanged(QCamera::State)), SLOT(cameraStateChanged()));
+}
+
+QCameraFocus::FocusModes AVFCameraFocusControl::focusMode() const
+{
+    return m_focusMode;
+}
+
+void AVFCameraFocusControl::setFocusMode(QCameraFocus::FocusModes mode)
+{
+    if (m_focusMode == mode)
+        return;
+
+    AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
+    if (!captureDevice) {
+        if (qt_focus_mode_supported(mode)) {
+            m_focusMode = mode;
+            Q_EMIT focusModeChanged(m_focusMode);
+        } else {
+            qDebugCamera() << Q_FUNC_INFO
+                           << "focus mode not supported";
+        }
+        return;
+    }
+
+    if (isFocusModeSupported(mode)) {
+        const AVFConfigurationLock lock(captureDevice);
+        if (!lock) {
+            qDebugCamera() << Q_FUNC_INFO
+                           << "failed to lock for configuration";
+            return;
+        }
+
+        captureDevice.focusMode = avf_focus_mode(mode);
+        m_focusMode = mode;
+    } else {
+        qDebugCamera() << Q_FUNC_INFO << "focus mode not supported";
+        return;
+    }
+
+    Q_EMIT focusModeChanged(m_focusMode);
+}
+
+bool AVFCameraFocusControl::isFocusModeSupported(QCameraFocus::FocusModes mode) const
+{
+    AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
+    if (!captureDevice)
+        return false;
+
+    if (!qt_focus_mode_supported(mode))
+        return false;
+
+    return [captureDevice isFocusModeSupported:avf_focus_mode(mode)];
+}
+
+QCameraFocus::FocusPointMode AVFCameraFocusControl::focusPointMode() const
+{
+    return m_focusPointMode;
+}
+
+void AVFCameraFocusControl::setFocusPointMode(QCameraFocus::FocusPointMode mode)
+{
+    if (m_focusPointMode == mode)
+        return;
+
+    AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
+    if (!captureDevice) {
+        if (qt_focus_point_mode_supported(mode)) {
+            m_focusPointMode = mode;
+            Q_EMIT focusPointModeChanged(mode);
+        }
+        return;
+    }
+
+    if (isFocusPointModeSupported(mode)) {
+        const AVFConfigurationLock lock(captureDevice);
+        if (!lock) {
+            qDebugCamera() << Q_FUNC_INFO << "failed to lock for configuration";
+            return;
+        }
+
+        bool resetPOI = false;
+        if (mode == QCameraFocus::FocusPointCenter || mode == QCameraFocus::FocusPointAuto) {
+            if (m_actualFocusPoint != QPointF(0.5, 0.5)) {
+                m_actualFocusPoint = QPointF(0.5, 0.5);
+                resetPOI = true;
+            }
+        } else if (mode == QCameraFocus::FocusPointCustom) {
+            if (m_actualFocusPoint != m_customFocusPoint) {
+                m_actualFocusPoint = m_customFocusPoint;
+                resetPOI = true;
+            }
+        } // else for any other mode in future.
+
+        if (resetPOI) {
+            const CGPoint focusPOI = CGPointMake(m_actualFocusPoint.x(), m_actualFocusPoint.y());
+            [captureDevice setFocusPointOfInterest:focusPOI];
+        }
+        m_focusPointMode = mode;
+    } else {
+        qDebugCamera() << Q_FUNC_INFO << "focus point mode is not supported";
+        return;
+    }
+
+    Q_EMIT focusPointModeChanged(mode);
+}
+
+bool AVFCameraFocusControl::isFocusPointModeSupported(QCameraFocus::FocusPointMode mode) const
+{
+    AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
+    if (!captureDevice)
+        return false;
+
+    if (!qt_focus_point_mode_supported(mode))
+        return false;
+
+    return [captureDevice isFocusPointOfInterestSupported];
+}
+
+QPointF AVFCameraFocusControl::customFocusPoint() const
+{
+    return m_customFocusPoint;
+}
+
+void AVFCameraFocusControl::setCustomFocusPoint(const QPointF &point)
+{
+    if (m_customFocusPoint == point)
+        return;
+
+    if (!QRectF(0.f, 0.f, 1.f, 1.f).contains(point)) {
+        qDebugCamera() << Q_FUNC_INFO << "invalid focus point (out of range)";
+        return;
+    }
+
+    m_customFocusPoint = point;
+    Q_EMIT customFocusPointChanged(m_customFocusPoint);
+
+    AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
+    if (!captureDevice || m_focusPointMode != QCameraFocus::FocusPointCustom)
+        return;
+
+    if ([captureDevice isFocusPointOfInterestSupported]) {
+        const AVFConfigurationLock lock(captureDevice);
+        if (!lock) {
+            qDebugCamera() << Q_FUNC_INFO << "failed to lock for configuration";
+            return;
+        }
+
+        m_actualFocusPoint = m_customFocusPoint;
+        const CGPoint focusPOI = CGPointMake(point.x(), point.y());
+        [captureDevice setFocusPointOfInterest:focusPOI];
+        if (m_focusMode != QCameraFocus::ContinuousFocus)
+            [captureDevice setFocusMode:AVCaptureFocusModeAutoFocus];
+    } else {
+        qDebugCamera() << Q_FUNC_INFO << "focus point of interest not supported";
+        return;
+    }
+}
+
+QCameraFocusZoneList AVFCameraFocusControl::focusZones() const
+{
+    // Unsupported.
+    return QCameraFocusZoneList();
+}
+
+void AVFCameraFocusControl::cameraStateChanged()
+{
+    if (m_session->state() != QCamera::ActiveState)
+        return;
+
+    AVCaptureDevice *captureDevice = m_session->videoCaptureDevice();
+    if (!captureDevice) {
+        qDebugCamera() << Q_FUNC_INFO << "capture device is nil in 'active' state";
+        return;
+    }
+
+    const AVFConfigurationLock lock(captureDevice);
+    if (m_customFocusPoint != m_actualFocusPoint
+        && m_focusPointMode == QCameraFocus::FocusPointCustom) {
+        if (![captureDevice isFocusPointOfInterestSupported]) {
+            qDebugCamera() << Q_FUNC_INFO
+                           << "focus point of interest not supported";
+            return;
+        }
+
+        if (!lock) {
+            qDebugCamera() << Q_FUNC_INFO << "failed to lock for configuration";
+            return;
+        }
+
+        m_actualFocusPoint = m_customFocusPoint;
+        const CGPoint focusPOI = CGPointMake(m_customFocusPoint.x(), m_customFocusPoint.y());
+        [captureDevice setFocusPointOfInterest:focusPOI];
+    }
+
+    if (m_focusMode != QCameraFocus::ContinuousFocus) {
+        const AVCaptureFocusMode avMode = avf_focus_mode(m_focusMode);
+        if (captureDevice.focusMode != avMode) {
+            if (![captureDevice isFocusModeSupported:avMode]) {
+                qDebugCamera() << Q_FUNC_INFO << "focus mode not supported";
+                return;
+            }
+
+            if (!lock) {
+                qDebugCamera() << Q_FUNC_INFO << "failed to lock for configuration";
+                return;
+            }
+
+            [captureDevice setFocusMode:avMode];
+        }
+    }
+}
+
+QT_END_NAMESPACE
+
+#include "moc_avfcamerafocuscontrol.cpp"

src/plugins/avfoundation/camera/avfcameraservice.h

@@ -52,6 +52,7 @@ class AVFImageCaptureControl;
 class AVFCameraSession;
 class AVFCameraDeviceControl;
 class AVFAudioInputSelectorControl;
+class AVFCameraFocusControl;
 
 class AVFCameraService : public QMediaService
 {
@@ -70,7 +71,7 @@ public:
     AVFCameraMetaDataControl *metaDataControl() const { return m_metaDataControl; }
     AVFMediaRecorderControl *recorderControl() const { return m_recorderControl; }
     AVFImageCaptureControl *imageCaptureControl() const { return m_imageCaptureControl; }
-
+    AVFCameraFocusControl *cameraFocusControl() const { return m_cameraFocusControl; }
 
 private:
     AVFCameraSession *m_session;
@@ -82,6 +83,7 @@ private:
     AVFCameraMetaDataControl *m_metaDataControl;
     AVFMediaRecorderControl *m_recorderControl;
     AVFImageCaptureControl *m_imageCaptureControl;
+    AVFCameraFocusControl *m_cameraFocusControl;
 };
 
 QT_END_NAMESPACE

src/plugins/avfoundation/camera/avfcameraservice.mm

@@ -55,6 +55,7 @@
 #include "avfmediarecordercontrol.h"
 #include "avfimagecapturecontrol.h"
 #include "avfmediavideoprobecontrol.h"
+#include "avfcamerafocuscontrol.h"
 
 #include <private/qmediaplaylistnavigator_p.h>
 #include <qmediaplaylist.h>
@@ -74,6 +75,8 @@ AVFCameraService::AVFCameraService(QObject *parent):
     m_metaDataControl = new AVFCameraMetaDataControl(this);
     m_recorderControl = new AVFMediaRecorderControl(this);
     m_imageCaptureControl = new AVFImageCaptureControl(this);
+
+    m_cameraFocusControl = new AVFCameraFocusControl(this);
 }
 
 AVFCameraService::~AVFCameraService()
@@ -92,6 +95,7 @@ AVFCameraService::~AVFCameraService()
     //delete m_recorderControl;
     delete m_metaDataControl;
     delete m_cameraControl;
+    delete m_cameraFocusControl;
 
     delete m_session;
 }
@@ -120,6 +124,9 @@ QMediaControl *AVFCameraService::requestControl(const char *name)
     if (qstrcmp(name, QCameraImageCaptureControl_iid) == 0)
         return m_imageCaptureControl;
 
+    if (qstrcmp(name, QCameraFocusControl_iid) == 0)
+        return m_cameraFocusControl;
+
     if (qstrcmp(name,QMediaVideoProbeControl_iid) == 0) {
         AVFMediaVideoProbeControl *videoProbe = 0;
         videoProbe = new AVFMediaVideoProbeControl(this);

src/plugins/avfoundation/camera/avfconfigurationlock.h

@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** 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 Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/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.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights. These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef AVFCONFIGURATIONLOCK_H
+#define AVFCONFIGURATIONLOCK_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qdebug.h>
+
+#include <AVFoundation/AVFoundation.h>
+
+@class AVCaptureDevice;
+
+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;
+};
+
+QT_END_NAMESPACE
+
+#endif

src/plugins/avfoundation/camera/camera.pro

@@ -36,7 +36,9 @@ HEADERS += \
     avfmediavideoprobecontrol.h \
     avfcamerainfocontrol.h \
     avfcamerarenderercontrol.h \
-    avfcameradevicecontrol.h
+    avfcameradevicecontrol.h \
+    avfcamerafocuscontrol.h \
+    avfconfigurationlock.h
 
 OBJECTIVE_SOURCES += \
     avfcameraserviceplugin.mm \
@@ -52,5 +54,6 @@ OBJECTIVE_SOURCES += \
     avfmediavideoprobecontrol.mm \
     avfcamerainfocontrol.mm \
     avfcameradevicecontrol.mm \
-    avfcamerarenderercontrol.mm
+    avfcamerarenderercontrol.mm \
+    avfcamerafocuscontrol.mm