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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_device.h - V4L2 Device
*/
#ifndef __LIBCAMERA_V4L2_DEVICE_H__
#define __LIBCAMERA_V4L2_DEVICE_H__
#include <string>
#include <linux/videodev2.h>
namespace libcamera {
struct V4L2Capability final : v4l2_capability {
const char *driver() const
{
return reinterpret_cast<const char *>(v4l2_capability::driver);
}
const char *card() const
{
return reinterpret_cast<const char *>(v4l2_capability::card);
}
const char *bus_info() const
{
return reinterpret_cast<const char *>(v4l2_capability::bus_info);
}
unsigned int device_caps() const
{
return capabilities & V4L2_CAP_DEVICE_CAPS
? v4l2_capability::device_caps
: v4l2_capability::capabilities;
}
bool isMultiplanar() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_VIDEO_OUTPUT_MPLANE);
}
bool isCapture() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE);
}
bool isOutput() const
{
return device_caps() & (V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE);
}
bool hasStreaming() const
{
return device_caps() & V4L2_CAP_STREAMING;
}
};
class V4L2DeviceFormat
{
public:
uint32_t width;
uint32_t height;
uint32_t fourcc;
struct {
uint32_t size;
uint32_t bpl;
} planes[3];
unsigned int planesCount;
};
class MediaEntity;
class V4L2Device
{
public:
explicit V4L2Device(const std::string &deviceNode);
explicit V4L2Device(const MediaEntity &entity);
V4L2Device(const V4L2Device &) = delete;
~V4L2Device();
V4L2Device &operator=(const V4L2Device &) = delete;
int open();
bool isOpen() const;
void close();
const char *driverName() const { return caps_.driver(); }
const char *deviceName() const { return caps_.card(); }
const char *busName() const { return caps_.bus_info(); }
int getFormat(V4L2DeviceFormat *format);
int setFormat(V4L2DeviceFormat *format);
private:
int getFormatSingleplane(V4L2DeviceFormat *format);
int setFormatSingleplane(V4L2DeviceFormat *format);
int getFormatMultiplane(V4L2DeviceFormat *format);
int setFormatMultiplane(V4L2DeviceFormat *format);
std::string deviceNode_;
int fd_;
V4L2Capability caps_;
enum v4l2_buf_type bufferType_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_V4L2_DEVICE_H__ */
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