1 files changed, 71 insertions, 0 deletions
diff --git a/src/plugins/multimedia/ffmpeg/qv4l2filedescriptor.cpp b/src/plugins/multimedia/ffmpeg/qv4l2filedescriptor.cpp
new file mode 100644
index 000000000..7f7b099c7
--- /dev/null
+++ b/src/plugins/multimedia/ffmpeg/qv4l2filedescriptor.cpp
@@ -0,0 +1,71 @@
+// 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