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Diffstat (limited to 'src/plugins/avfoundation/camera/avfcameraflashcontrol.mm')
| -rw-r--r-- | src/plugins/avfoundation/camera/avfcameraflashcontrol.mm | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/src/plugins/avfoundation/camera/avfcameraflashcontrol.mm b/src/plugins/avfoundation/camera/avfcameraflashcontrol.mm new file mode 100644 index 000000000..0eef95e92 --- /dev/null +++ b/src/plugins/avfoundation/camera/avfcameraflashcontrol.mm @@ -0,0 +1,227 @@ +/**************************************************************************** +** +** 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. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "avfcameraflashcontrol.h" +#include "avfcamerautility.h" +#include "avfcamerasession.h" +#include "avfcameraservice.h" +#include "avfcameradebug.h" + +#include <QtCore/qdebug.h> + +#include <AVFoundation/AVFoundation.h> + + +AVFCameraFlashControl::AVFCameraFlashControl(AVFCameraService *service) + : m_service(service) + , m_session(0) + , m_supportedModes(QCameraExposure::FlashOff) + , m_flashMode(QCameraExposure::FlashOff) +{ + Q_ASSERT(service); + m_session = m_service->session(); + Q_ASSERT(m_session); + + connect(m_session, SIGNAL(stateChanged(QCamera::State)), SLOT(cameraStateChanged(QCamera::State))); +} + +QCameraExposure::FlashModes AVFCameraFlashControl::flashMode() const +{ + return m_flashMode; +} + +void AVFCameraFlashControl::setFlashMode(QCameraExposure::FlashModes mode) +{ + if (m_flashMode == mode) + return; + + if (m_session->state() == QCamera::ActiveState && !isFlashModeSupported(mode)) { + qDebugCamera() << Q_FUNC_INFO << "unsupported mode" << mode; + return; + } + + m_flashMode = mode; + + if (m_session->state() != QCamera::ActiveState) + return; + + applyFlashSettings(); +} + +bool AVFCameraFlashControl::isFlashModeSupported(QCameraExposure::FlashModes mode) const +{ + // From what QCameraExposure has, we can support only these: + // FlashAuto = 0x1, + // FlashOff = 0x2, + // FlashOn = 0x4, + // AVCaptureDevice has these flash modes: + // AVCaptureFlashModeAuto + // AVCaptureFlashModeOff + // AVCaptureFlashModeOn + // QCameraExposure also has: + // FlashTorch = 0x20, --> "Constant light source." + // FlashVideoLight = 0x40. --> "Constant light source." + // AVCaptureDevice: + // AVCaptureTorchModeOff (no mapping) + // AVCaptureTorchModeOn --> FlashVideoLight + // AVCaptureTorchModeAuto (no mapping) + + return m_supportedModes & mode; +} + +bool AVFCameraFlashControl::isFlashReady() const +{ + if (m_session->state() != QCamera::ActiveState) + return false; + + AVCaptureDevice *captureDevice = m_session->videoCaptureDevice(); + if (!captureDevice) + return false; + + if (!captureDevice.hasFlash && !captureDevice.hasTorch) + return false; + + if (!isFlashModeSupported(m_flashMode)) + return false; + +#ifdef Q_OS_IOS + // AVCaptureDevice's docs: + // "The flash may become unavailable if, for example, + // the device overheats and needs to cool off." + if (m_flashMode != QCameraExposure::FlashVideoLight) + return [captureDevice isFlashAvailable]; + + return [captureDevice isTorchAvailable]; +#endif + + return true; +} + +void AVFCameraFlashControl::cameraStateChanged(QCamera::State newState) +{ + if (newState == QCamera::UnloadedState) { + m_supportedModes = QCameraExposure::FlashOff; + Q_EMIT flashReady(false); + } else if (newState == QCamera::ActiveState) { + m_supportedModes = QCameraExposure::FlashOff; + AVCaptureDevice *captureDevice = m_session->videoCaptureDevice(); + if (!captureDevice) { + qDebugCamera() << Q_FUNC_INFO << "no capture device in 'Active' state"; + Q_EMIT flashReady(false); + return; + } + + if (captureDevice.hasFlash) { + if ([captureDevice isFlashModeSupported:AVCaptureFlashModeOn]) + m_supportedModes |= QCameraExposure::FlashOn; + if ([captureDevice isFlashModeSupported:AVCaptureFlashModeAuto]) + m_supportedModes |= QCameraExposure::FlashAuto; + } + + if (captureDevice.hasTorch && [captureDevice isTorchModeSupported:AVCaptureTorchModeOn]) + m_supportedModes |= QCameraExposure::FlashVideoLight; + + Q_EMIT flashReady(applyFlashSettings()); + } +} + +bool AVFCameraFlashControl::applyFlashSettings() +{ + Q_ASSERT(m_session->state() == QCamera::ActiveState); + + AVCaptureDevice *captureDevice = m_session->videoCaptureDevice(); + if (!captureDevice) { + qDebugCamera() << Q_FUNC_INFO << "no capture device found"; + return false; + } + + if (!isFlashModeSupported(m_flashMode)) { + qDebugCamera() << Q_FUNC_INFO << "unsupported mode" << m_flashMode; + return false; + } + + if (!captureDevice.hasFlash && !captureDevice.hasTorch) { + // FlashOff is the only mode we support. + // Return false - flash is not ready. + return false; + } + + const AVFConfigurationLock lock(captureDevice); + + if (m_flashMode != QCameraExposure::FlashVideoLight) { + if (captureDevice.torchMode != AVCaptureTorchModeOff) { +#ifdef Q_OS_IOS + if (![captureDevice isTorchAvailable]) { + qDebugCamera() << Q_FUNC_INFO << "torch is not available at the moment"; + return false; + } +#endif + captureDevice.torchMode = AVCaptureTorchModeOff; + } +#ifdef Q_OS_IOS + if (![captureDevice isFlashAvailable]) { + // We'd like to switch flash (into some mode), but it's not available: + qDebugCamera() << Q_FUNC_INFO << "flash is not available at the moment"; + return false; + } +#endif + } else { + if (captureDevice.flashMode != AVCaptureFlashModeOff) { +#ifdef Q_OS_IOS + if (![captureDevice isFlashAvailable]) { + qDebugCamera() << Q_FUNC_INFO << "flash is not available at the moment"; + return false; + } +#endif + captureDevice.flashMode = AVCaptureFlashModeOff; + } + +#ifdef Q_OS_IOS + if (![captureDevice isTorchAvailable]) { + qDebugCamera() << Q_FUNC_INFO << "torch is not available at the moment"; + return false; + } +#endif + } + + if (m_flashMode == QCameraExposure::FlashOff) + captureDevice.flashMode = AVCaptureFlashModeOff; + else if (m_flashMode == QCameraExposure::FlashOn) + captureDevice.flashMode = AVCaptureFlashModeOn; + else if (m_flashMode == QCameraExposure::FlashAuto) + captureDevice.flashMode = AVCaptureFlashModeAuto; + else if (m_flashMode == QCameraExposure::FlashVideoLight) + captureDevice.torchMode = AVCaptureTorchModeOn; + + return true; +} |