18 #include <linux/videodev2.h>
43 return reinterpret_cast<const char *
>(v4l2_capability::driver);
47 return reinterpret_cast<const char *
>(v4l2_capability::card);
51 return reinterpret_cast<const char *
>(v4l2_capability::bus_info);
55 return capabilities & V4L2_CAP_DEVICE_CAPS
56 ? v4l2_capability::device_caps
57 : v4l2_capability::capabilities;
61 return device_caps() & (V4L2_CAP_VIDEO_CAPTURE_MPLANE |
62 V4L2_CAP_VIDEO_OUTPUT_MPLANE |
63 V4L2_CAP_VIDEO_M2M_MPLANE);
68 V4L2_CAP_VIDEO_CAPTURE_MPLANE |
69 V4L2_CAP_META_CAPTURE);
74 V4L2_CAP_VIDEO_OUTPUT_MPLANE |
75 V4L2_CAP_META_OUTPUT);
80 V4L2_CAP_VIDEO_CAPTURE_MPLANE |
81 V4L2_CAP_VIDEO_OUTPUT |
82 V4L2_CAP_VIDEO_OUTPUT_MPLANE);
87 V4L2_CAP_VIDEO_M2M_MPLANE);
92 V4L2_CAP_META_OUTPUT);
124 V4L2BufferCache(
const std::vector<std::unique_ptr<FrameBuffer>> &buffers);
128 void put(
unsigned int index);
135 Entry(
bool free, uint64_t lastUsed,
const FrameBuffer &buffer);
153 std::vector<Plane> planes_;
156 std::atomic<uint64_t> lastUsedCounter_;
157 std::vector<Entry> cache_;
159 unsigned int missCounter_;
183 using Formats = std::map<V4L2PixelFormat, std::vector<SizeRange>>;
207 std::vector<std::unique_ptr<FrameBuffer>> *buffers);
209 std::vector<std::unique_ptr<FrameBuffer>> *buffers);
219 static std::unique_ptr<V4L2VideoDevice>
237 std::vector<V4L2PixelFormat> enumPixelformats(uint32_t code);
240 int requestBuffers(
unsigned int count,
enum v4l2_memory memoryType);
241 int createBuffers(
unsigned int count,
242 std::vector<std::unique_ptr<FrameBuffer>> *buffers);
243 std::unique_ptr<FrameBuffer> createBuffer(
unsigned int index);
244 UniqueFD exportDmabufFd(
unsigned int index,
unsigned int plane);
246 void bufferAvailable();
253 enum v4l2_buf_type bufferType_;
254 enum v4l2_memory memoryType_;
257 std::map<unsigned int, FrameBuffer *> queuedBuffers_;
277 std::string deviceNode_;
Utilities to help constructing class interfaces.
#define LIBCAMERA_DISABLE_COPY(klass)
Disable copy construction and assignment of the klass.
Notify of activity on a file descriptor.
Definition: event_notifier.h:20
Frame buffer data and its associated dynamic metadata.
Definition: framebuffer.h:50
Describe a rectangle's position and dimensions.
Definition: geometry.h:236
RAII-style wrapper for file descriptors.
Definition: shared_fd.h:17
int get() const
Retrieve the numerical file descriptor.
Definition: shared_fd.h:30
Generic signal and slot communication mechanism.
Definition: signal.h:39
Describe a two-dimensional size.
Definition: geometry.h:50
unique_ptr-like wrapper for a file descriptor
Definition: unique_fd.h:18
Hot cache of associations between V4L2 buffer indexes and FrameBuffer.
Definition: v4l2_videodevice.h:121
V4L2BufferCache(unsigned int numEntries)
Create an empty cache with numEntries entries.
Definition: v4l2_videodevice.cpp:175
int get(const FrameBuffer &buffer)
Find the best V4L2 buffer for a FrameBuffer.
Definition: v4l2_videodevice.cpp:217
void put(unsigned int index)
Mark buffer index as free in the cache.
Definition: v4l2_videodevice.cpp:259
Base class for V4L2VideoDevice and V4L2Subdevice.
Definition: v4l2_device.h:30
const std::string & deviceNode() const
Retrieve the device node path.
Definition: v4l2_device.h:42
Memory-to-Memory video device.
Definition: v4l2_videodevice.h:265
V4L2VideoDevice * capture()
Retrieve the capture V4L2VideoDevice instance.
Definition: v4l2_videodevice.h:274
void close()
Close the memory-to-memory device, releasing any resources acquired by open()
Definition: v4l2_videodevice.cpp:1954
int open()
Open a V4L2 Memory to Memory device.
Definition: v4l2_videodevice.cpp:1917
V4L2VideoDevice * output()
Retrieve the output V4L2VideoDevice instance.
Definition: v4l2_videodevice.h:273
V4L2M2MDevice(const std::string &deviceNode)
Create a new V4L2M2MDevice from the deviceNode.
Definition: v4l2_videodevice.cpp:1896
V4L2VideoDevice object and API.
Definition: v4l2_videodevice.h:181
std::map< V4L2PixelFormat, std::vector< SizeRange > > Formats
A map of supported V4L2 pixel formats to frame sizes.
Definition: v4l2_videodevice.h:183
const char * driverName() const
Retrieve the name of the V4L2 device driver.
Definition: v4l2_videodevice.h:193
int importBuffers(unsigned int count)
Prepare the device to import count buffers.
Definition: v4l2_videodevice.cpp:1444
int releaseBuffers()
Release resources allocated by allocateBuffers() or importBuffers()
Definition: v4l2_videodevice.cpp:1472
int tryFormat(V4L2DeviceFormat *format)
Try an image format on the V4L2 video device.
Definition: v4l2_videodevice.cpp:779
const char * deviceName() const
Retrieve the name of the V4L2 video device.
Definition: v4l2_videodevice.h:194
std::string logPrefix() const override
Retrieve a string to be prefixed to the log message.
Definition: v4l2_videodevice.cpp:748
int allocateBuffers(unsigned int count, std::vector< std::unique_ptr< FrameBuffer >> *buffers)
Allocate and export buffers from the video device.
Definition: v4l2_videodevice.cpp:1225
int open()
Open the V4L2 video device node and query its capabilities.
Definition: v4l2_videodevice.cpp:541
int streamOn()
Start the video stream.
Definition: v4l2_videodevice.cpp:1788
int queueBuffer(FrameBuffer *buffer)
Queue a buffer to the video device.
Definition: v4l2_videodevice.cpp:1496
V4L2VideoDevice(const std::string &deviceNode)
Construct a V4L2VideoDevice.
Definition: v4l2_videodevice.cpp:508
int streamOff()
Stop the video stream.
Definition: v4l2_videodevice.cpp:1817
int getFormat(V4L2DeviceFormat *format)
Retrieve the image format set on the V4L2 video device.
Definition: v4l2_videodevice.cpp:759
void close()
Close the video device, releasing any resources acquired by open()
Definition: v4l2_videodevice.cpp:711
const char * busName() const
Retrieve the location of the device in the system.
Definition: v4l2_videodevice.h:195
static std::unique_ptr< V4L2VideoDevice > fromEntityName(const MediaDevice *media, const std::string &entity)
Create a new video device instance from entity in media device media.
Definition: v4l2_videodevice.cpp:1855
int setSelection(unsigned int target, Rectangle *rect)
Set a selection rectangle rect for target.
Definition: v4l2_videodevice.cpp:1139
const V4L2Capability & caps() const
Retrieve the device V4L2 capabilities.
Definition: v4l2_videodevice.h:197
Signal< FrameBuffer * > bufferReady
A Signal emitted when a framebuffer completes.
Definition: v4l2_videodevice.h:214
int setFormat(V4L2DeviceFormat *format)
Configure an image format on the V4L2 video device.
Definition: v4l2_videodevice.cpp:798
Formats formats(uint32_t code=0)
Enumerate all pixel formats and frame sizes.
Definition: v4l2_videodevice.cpp:1016
int exportBuffers(unsigned int count, std::vector< std::unique_ptr< FrameBuffer >> *buffers)
Export buffers from the video device.
Definition: v4l2_videodevice.cpp:1274
Class and enums to represent color spaces.
Data structures related to geometric objects.
Top-level libcamera namespace.
Definition: backtrace.h:17
bool operator==(const ColorSpace &lhs, const ColorSpace &rhs)
Compare color spaces for equality.
Definition: color_space.cpp:303
Signal & slot implementation.
A memory region to store a single plane of a frame.
Definition: framebuffer.h:54
unsigned int length
The plane length in bytes.
Definition: framebuffer.h:58
SharedFD fd
The dmabuf file descriptor.
Definition: framebuffer.h:56
struct v4l2_capability object wrapper and helpers
Definition: v4l2_videodevice.h:40
bool hasStreaming() const
Determine if the video device can perform Streaming I/O.
Definition: v4l2_videodevice.h:110
unsigned int device_caps() const
Retrieve the capabilities of the video device.
Definition: v4l2_videodevice.h:53
bool isVideoOutput() const
Identify if the video device outputs images.
Definition: v4l2_videodevice.h:98
bool isM2M() const
Identify if the device is a Memory-to-Memory device.
Definition: v4l2_videodevice.h:84
bool isMetaCapture() const
Identify if the video device captures image meta-data.
Definition: v4l2_videodevice.h:102
bool hasMediaController() const
Determine if the video device uses Media Controller to configure I/O.
Definition: v4l2_videodevice.h:114
bool isOutput() const
Identify if the video device outputs data.
Definition: v4l2_videodevice.h:71
bool isVideoCapture() const
Identify if the video device captures images.
Definition: v4l2_videodevice.h:94
bool isMultiplanar() const
Identify if the video device implements the V4L2 multiplanar APIs.
Definition: v4l2_videodevice.h:59
bool isMeta() const
Identify if the video device captures or outputs image meta-data.
Definition: v4l2_videodevice.h:89
bool isCapture() const
Identify if the video device captures data.
Definition: v4l2_videodevice.h:65
bool isMetaOutput() const
Identify if the video device outputs image meta-data.
Definition: v4l2_videodevice.h:106
const char * bus_info() const
Retrieve the location of the video device in the system.
Definition: v4l2_videodevice.h:49
const char * card() const
Retrieve the video device card name.
Definition: v4l2_videodevice.h:45
bool isVideo() const
Identify if the video device captures or outputs images.
Definition: v4l2_videodevice.h:77
const char * driver() const
Retrieve the driver module name.
Definition: v4l2_videodevice.h:41
File descriptor wrapper that owns a file descriptor.
Common base for V4L2 devices and subdevices.