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- // Copyright (C) 2023 The Qt Company Ltd.
- // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-
- #include "qv4l2filedescriptor_p.h"
-
- #include <QtMultimedia/private/qmultimediautils_p.h>
- #include <QtCore/private/qcore_unix_p.h>
-
- #include <linux/videodev2.h>
-
- QT_BEGIN_NAMESPACE
-
- QV4L2FileDescriptor::QV4L2FileDescriptor(int descriptor) : m_descriptor(descriptor)
- {
- Q_ASSERT(descriptor >= 0);
- }
-
- QV4L2FileDescriptor::~QV4L2FileDescriptor()
- {
- qt_safe_close(m_descriptor);
- }
-
- bool QV4L2FileDescriptor::call(int request, void *arg) const
- {
- return QtMultimediaPrivate::qt_safe_ioctl(m_descriptor, request, arg) >= 0;
- }
-
- bool QV4L2FileDescriptor::requestBuffers(quint32 memoryType, quint32 &buffersCount) const
- {
- v4l2_requestbuffers req = {};
- req.count = buffersCount;
- req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- req.memory = memoryType;
-
- if (!call(VIDIOC_REQBUFS, &req))
- return false;
-
- buffersCount = req.count;
- return true;
- }
-
- bool QV4L2FileDescriptor::startStream()
- {
- int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- if (!call(VIDIOC_STREAMON, &type))
- return false;
-
- m_streamStarted = true;
- return true;
- }
-
- bool QV4L2FileDescriptor::stopStream()
- {
- int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- auto result = call(VIDIOC_STREAMOFF, &type);
- m_streamStarted = false;
- return result;
- }
-
- QT_END_NAMESPACE