7#ifndef __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__
8#define __LIBCAMERA_INTERNAL_V4L2_VIDEODEVICE_H__
17#include <linux/videodev2.h>
41 return reinterpret_cast<const char *
>(v4l2_capability::driver);
45 return reinterpret_cast<const char *
>(v4l2_capability::card);
49 return reinterpret_cast<const char *
>(v4l2_capability::bus_info);
53 return capabilities & V4L2_CAP_DEVICE_CAPS
54 ? v4l2_capability::device_caps
55 : v4l2_capability::capabilities;
59 return device_caps() & (V4L2_CAP_VIDEO_CAPTURE_MPLANE |
60 V4L2_CAP_VIDEO_OUTPUT_MPLANE |
61 V4L2_CAP_VIDEO_M2M_MPLANE);
66 V4L2_CAP_VIDEO_CAPTURE_MPLANE |
67 V4L2_CAP_META_CAPTURE);
72 V4L2_CAP_VIDEO_OUTPUT_MPLANE |
73 V4L2_CAP_META_OUTPUT);
78 V4L2_CAP_VIDEO_CAPTURE_MPLANE |
79 V4L2_CAP_VIDEO_OUTPUT |
80 V4L2_CAP_VIDEO_OUTPUT_MPLANE);
85 V4L2_CAP_VIDEO_M2M_MPLANE);
90 V4L2_CAP_META_OUTPUT);
122 V4L2BufferCache(
const std::vector<std::unique_ptr<FrameBuffer>> &buffers);
126 void put(
unsigned int index);
133 Entry(
bool free, uint64_t lastUsed,
const FrameBuffer &buffer);
151 std::vector<Plane> planes_;
154 std::atomic<uint64_t> lastUsedCounter_;
155 std::vector<Entry> cache_;
157 unsigned int missCounter_;
180 using Formats = std::map<V4L2PixelFormat, std::vector<SizeRange>>;
187 int open(
int handle,
enum v4l2_buf_type type);
204 std::vector<std::unique_ptr<FrameBuffer>> *buffers);
206 std::vector<std::unique_ptr<FrameBuffer>> *buffers);
216 static std::unique_ptr<V4L2VideoDevice>
234 std::vector<V4L2PixelFormat> enumPixelformats(uint32_t code);
237 int requestBuffers(
unsigned int count,
enum v4l2_memory memoryType);
238 int createBuffers(
unsigned int count,
239 std::vector<std::unique_ptr<FrameBuffer>> *buffers);
240 std::unique_ptr<FrameBuffer> createBuffer(
unsigned int index);
241 FileDescriptor exportDmabufFd(
unsigned int index,
unsigned int plane);
243 void bufferAvailable();
250 enum v4l2_buf_type bufferType_;
251 enum v4l2_memory memoryType_;
254 std::map<unsigned int, FrameBuffer *> queuedBuffers_;
274 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
RAII-style wrapper for file descriptors.
Definition: file_descriptor.h:16
int fd() const
Retrieve the numerical file descriptor.
Definition: file_descriptor.h:28
Frame buffer data and its associated dynamic metadata.
Definition: framebuffer.h:49
Describe a rectangle's position and dimensions.
Definition: geometry.h:237
Generic signal and slot communication mechanism.
Definition: signal.h:39
Describe a two-dimensional size.
Definition: geometry.h:51
Hot cache of associations between V4L2 buffer indexes and FrameBuffer.
Definition: v4l2_videodevice.h:119
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:27
const std::string & deviceNode() const
Retrieve the device node path.
Definition: v4l2_device.h:39
Memory-to-Memory video device.
Definition: v4l2_videodevice.h:262
V4L2VideoDevice * capture()
Retrieve the capture V4L2VideoDevice instance.
Definition: v4l2_videodevice.h:271
void close()
Close the memory-to-memory device, releasing any resources acquired by open()
Definition: v4l2_videodevice.cpp:1945
int open()
Open a V4L2 Memory to Memory device.
Definition: v4l2_videodevice.cpp:1902
V4L2VideoDevice * output()
Retrieve the output V4L2VideoDevice instance.
Definition: v4l2_videodevice.h:270
V4L2M2MDevice(const std::string &deviceNode)
Create a new V4L2M2MDevice from the deviceNode.
Definition: v4l2_videodevice.cpp:1881
V4L2VideoDevice object and API.
Definition: v4l2_videodevice.h:178
std::map< V4L2PixelFormat, std::vector< SizeRange > > Formats
A map of supported V4L2 pixel formats to frame sizes.
Definition: v4l2_videodevice.h:180
const char * driverName() const
Retrieve the name of the V4L2 device driver.
Definition: v4l2_videodevice.h:190
int importBuffers(unsigned int count)
Prepare the device to import count buffers.
Definition: v4l2_videodevice.cpp:1429
int releaseBuffers()
Release resources allocated by allocateBuffers() or importBuffers()
Definition: v4l2_videodevice.cpp:1457
int tryFormat(V4L2DeviceFormat *format)
Try an image format on the V4L2 video device.
Definition: v4l2_videodevice.cpp:771
const char * deviceName() const
Retrieve the name of the V4L2 video device.
Definition: v4l2_videodevice.h:191
int allocateBuffers(unsigned int count, std::vector< std::unique_ptr< FrameBuffer > > *buffers)
Allocate and export buffers from the video device.
Definition: v4l2_videodevice.cpp:1210
std::string logPrefix() const override
Retrieve a string to be prefixed to the log message.
Definition: v4l2_videodevice.cpp:740
int open()
Open the V4L2 video device node and query its capabilities.
Definition: v4l2_videodevice.cpp:526
int streamOn()
Start the video stream.
Definition: v4l2_videodevice.cpp:1773
int queueBuffer(FrameBuffer *buffer)
Queue a buffer to the video device.
Definition: v4l2_videodevice.cpp:1481
V4L2VideoDevice(const std::string &deviceNode)
Construct a V4L2VideoDevice.
Definition: v4l2_videodevice.cpp:493
int streamOff()
Stop the video stream.
Definition: v4l2_videodevice.cpp:1802
int getFormat(V4L2DeviceFormat *format)
Retrieve the image format set on the V4L2 video device.
Definition: v4l2_videodevice.cpp:751
int exportBuffers(unsigned int count, std::vector< std::unique_ptr< FrameBuffer > > *buffers)
Export buffers from the video device.
Definition: v4l2_videodevice.cpp:1259
void close()
Close the video device, releasing any resources acquired by open()
Definition: v4l2_videodevice.cpp:703
const char * busName() const
Retrieve the location of the device in the system.
Definition: v4l2_videodevice.h:192
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:1840
int setSelection(unsigned int target, Rectangle *rect)
Set a selection rectangle rect for target.
Definition: v4l2_videodevice.cpp:1124
const V4L2Capability & caps() const
Retrieve the device V4L2 capabilities.
Definition: v4l2_videodevice.h:194
Signal< FrameBuffer * > bufferReady
A Signal emitted when a framebuffer completes.
Definition: v4l2_videodevice.h:211
int setFormat(V4L2DeviceFormat *format)
Configure an image format on the V4L2 video device.
Definition: v4l2_videodevice.cpp:790
Formats formats(uint32_t code=0)
Enumerate all pixel formats and frame sizes.
Definition: v4l2_videodevice.cpp:1001
Data structures related to geometric objects.
Top-level libcamera namespace.
Definition: backtrace.h:17
bool operator==(const Point &lhs, const Point &rhs)
Compare points for equality.
Definition: geometry.cpp:75
Signal & slot implementation.
A memory region to store a single plane of a frame.
Definition: framebuffer.h:53
unsigned int length
The plane length in bytes.
Definition: framebuffer.h:57
FileDescriptor fd
The dmabuf file descriptor.
Definition: framebuffer.h:55
struct v4l2_capability object wrapper and helpers
Definition: v4l2_videodevice.h:38
bool hasStreaming() const
Determine if the video device can perform Streaming I/O.
Definition: v4l2_videodevice.h:108
unsigned int device_caps() const
Retrieve the capabilities of the video device.
Definition: v4l2_videodevice.h:51
bool isVideoOutput() const
Identify if the video device outputs images.
Definition: v4l2_videodevice.h:96
bool isM2M() const
Identify if the device is a Memory-to-Memory device.
Definition: v4l2_videodevice.h:82
bool isMetaCapture() const
Identify if the video device captures image meta-data.
Definition: v4l2_videodevice.h:100
bool hasMediaController() const
Determine if the video device uses Media Controller to configure I/O.
Definition: v4l2_videodevice.h:112
bool isOutput() const
Identify if the video device outputs data.
Definition: v4l2_videodevice.h:69
bool isVideoCapture() const
Identify if the video device captures images.
Definition: v4l2_videodevice.h:92
bool isMultiplanar() const
Identify if the video device implements the V4L2 multiplanar APIs.
Definition: v4l2_videodevice.h:57
bool isMeta() const
Identify if the video device captures or outputs image meta-data.
Definition: v4l2_videodevice.h:87
bool isCapture() const
Identify if the video device captures data.
Definition: v4l2_videodevice.h:63
bool isMetaOutput() const
Identify if the video device outputs image meta-data.
Definition: v4l2_videodevice.h:104
const char * bus_info() const
Retrieve the location of the video device in the system.
Definition: v4l2_videodevice.h:47
const char * card() const
Retrieve the video device card name.
Definition: v4l2_videodevice.h:43
bool isVideo() const
Identify if the video device captures or outputs images.
Definition: v4l2_videodevice.h:75
const char * driver() const
Retrieve the driver module name.
Definition: v4l2_videodevice.h:39
Common base for V4L2 devices and subdevices.