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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_videodevice.h - V4L2 Video Device
*/
#ifndef __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__
#define __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__
#include <array>
#include <atomic>
#include <memory>
#include <stdint.h>
#include <string>
#include <vector>
#include <linux/videodev2.h>
#include <libcamera/base/class.h>
#include <libcamera/base/log.h>
#include <libcamera/base/signal.h>
#include <libcamera/framebuffer.h>
#include <libcamera/geometry.h>
#include <libcamera/pixel_format.h>
#include "libcamera/internal/formats.h"
#include "libcamera/internal/v4l2_device.h"
#include "libcamera/internal/v4l2_pixelformat.h"
namespace libcamera {
class EventNotifier;
class FileDescriptor;
class MediaDevice;
class MediaEntity;
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 |
V4L2_CAP_VIDEO_M2M_MPLANE);
}
bool isCapture() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_META_CAPTURE);
}
bool isOutput() const
{
return device_caps() & (V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE |
V4L2_CAP_META_OUTPUT);
}
bool isVideo() const
{
return device_caps() & (V4L2_CAP_VIDEO_CAPTURE |
V4L2_CAP_VIDEO_CAPTURE_MPLANE |
V4L2_CAP_VIDEO_OUTPUT |
V4L2_CAP_VIDEO_OUTPUT_MPLANE);
}
bool isM2M() const
{
return device_caps() & (V4L2_CAP_VIDEO_M2M |
V4L2_CAP_VIDEO_M2M_MPLANE);
}
bool isMeta() const
{
return device_caps() & (V4L2_CAP_META_CAPTURE |
V4L2_CAP_META_OUTPUT);
}
bool isVideoCapture() const
{
return isVideo() && isCapture();
}
bool isVideoOutput() const
{
return isVideo() && isOutput();
}
bool isMetaCapture() const
{
return isMeta() && isCapture();
}
bool isMetaOutput() const
{
return isMeta() && isOutput();
}
bool hasStreaming() const
{
return device_caps() & V4L2_CAP_STREAMING;
}
};
class V4L2BufferCache
{
public:
V4L2BufferCache(unsigned int numEntries);
V4L2BufferCache(const std::vector<std::unique_ptr<FrameBuffer>> &buffers);
~V4L2BufferCache();
int get(const FrameBuffer &buffer);
void put(unsigned int index);
private:
class Entry
{
public:
Entry();
Entry(bool free, uint64_t lastUsed, const FrameBuffer &buffer);
bool operator==(const FrameBuffer &buffer) const;
bool free_;
uint64_t lastUsed_;
private:
struct Plane {
Plane(const FrameBuffer::Plane &plane)
: fd(plane.fd.fd()), length(plane.length)
{
}
int fd;
unsigned int length;
};
std::vector<Plane> planes_;
};
std::atomic<uint64_t> lastUsedCounter_;
std::vector<Entry> cache_;
/* \todo Expose the miss counter through an instrumentation API. */
unsigned int missCounter_;
};
class V4L2DeviceFormat
{
public:
struct Plane {
uint32_t size = 0;
uint32_t bpl = 0;
};
V4L2PixelFormat fourcc;
Size size;
std::array<Plane, 3> planes;
unsigned int planesCount = 0;
const std::string toString() const;
};
class V4L2VideoDevice : public V4L2Device
{
public:
using Formats = std::map<V4L2PixelFormat, std::vector<SizeRange>>;
explicit V4L2VideoDevice(const std::string &deviceNode);
explicit V4L2VideoDevice(const MediaEntity *entity);
~V4L2VideoDevice();
int open();
int open(int handle, enum v4l2_buf_type type);
void close();
const char *driverName() const { return caps_.driver(); }
const char *deviceName() const { return caps_.card(); }
const char *busName() const { return caps_.bus_info(); }
const V4L2Capability &caps() const { return caps_; }
int getFormat(V4L2DeviceFormat *format);
int tryFormat(V4L2DeviceFormat *format);
int setFormat(V4L2DeviceFormat *format);
Formats formats(uint32_t code = 0);
int setSelection(unsigned int target, Rectangle *rect);
int allocateBuffers(unsigned int count,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
int exportBuffers(unsigned int count,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
int importBuffers(unsigned int count);
int releaseBuffers();
int queueBuffer(FrameBuffer *buffer);
Signal<FrameBuffer *> bufferReady;
int streamOn();
int streamOff();
static std::unique_ptr<V4L2VideoDevice>
fromEntityName(const MediaDevice *media, const std::string &entity);
protected:
std::string logPrefix() const override;
private:
LIBCAMERA_DISABLE_COPY(V4L2VideoDevice)
int getFormatMeta(V4L2DeviceFormat *format);
int trySetFormatMeta(V4L2DeviceFormat *format, bool set);
int getFormatMultiplane(V4L2DeviceFormat *format);
int trySetFormatMultiplane(V4L2DeviceFormat *format, bool set);
int getFormatSingleplane(V4L2DeviceFormat *format);
int trySetFormatSingleplane(V4L2DeviceFormat *format, bool set);
std::vector<V4L2PixelFormat> enumPixelformats(uint32_t code);
std::vector<SizeRange> enumSizes(V4L2PixelFormat pixelFormat);
int requestBuffers(unsigned int count, enum v4l2_memory memoryType);
int createBuffers(unsigned int count,
std::vector<std::unique_ptr<FrameBuffer>> *buffers);
std::unique_ptr<FrameBuffer> createBuffer(unsigned int index);
FileDescriptor exportDmabufFd(unsigned int index, unsigned int plane);
void bufferAvailable();
FrameBuffer *dequeueBuffer();
V4L2Capability caps_;
V4L2DeviceFormat format_;
enum v4l2_buf_type bufferType_;
enum v4l2_memory memoryType_;
V4L2BufferCache *cache_;
std::map<unsigned int, FrameBuffer *> queuedBuffers_;
EventNotifier *fdBufferNotifier_;
bool streaming_;
};
class V4L2M2MDevice
{
public:
V4L2M2MDevice(const std::string &deviceNode);
~V4L2M2MDevice();
int open();
void close();
V4L2VideoDevice *output() { return output_; }
V4L2VideoDevice *capture() { return capture_; }
private:
std::string deviceNode_;
V4L2VideoDevice *output_;
V4L2VideoDevice *capture_;
};
} /* namespace libcamera */
#endif /* __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__ */
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