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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 <sys/ioctl.h>
#include <private/qcore_unix_p.h>
#include <linux/videodev2.h>
QT_BEGIN_NAMESPACE
int xioctl(int fd, int request, void *arg)
{
int res;
do {
res = ::ioctl(fd, request, arg);
} while (res == -1 && EINTR == errno);
return res;
}
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 ::xioctl(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
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