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/****************************************************************************
**
** 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->requestedState() == 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;
}
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