Appendix A. Function Reference
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## Appendix A. Function Reference

Table of Contents

V4L2 close() — Close a V4L2 device
V4L2 ioctl() — Program a V4L2 device
ioctl VIDIOC_CREATE_BUFS — Create buffers for Memory Mapped or User Pointer or DMA Buffer I/O
ioctl VIDIOC_CROPCAP — Information about the video cropping and scaling abilities
ioctl VIDIOC_DBG_G_CHIP_INFO — Identify the chips on a TV card
ioctl VIDIOC_DBG_G_REGISTER, VIDIOC_DBG_S_REGISTER — Read or write hardware registers
ioctl VIDIOC_DECODER_CMD, VIDIOC_TRY_DECODER_CMD — Execute an decoder command
ioctl VIDIOC_DQEVENT — Dequeue event
ioctl VIDIOC_DV_TIMINGS_CAP — The capabilities of the Digital Video receiver/transmitter
ioctl VIDIOC_ENCODER_CMD, VIDIOC_TRY_ENCODER_CMD — Execute an encoder command
ioctl VIDIOC_ENUMAUDIO — Enumerate audio inputs
ioctl VIDIOC_ENUMAUDOUT — Enumerate audio outputs
ioctl VIDIOC_ENUM_DV_TIMINGS — Enumerate supported Digital Video timings
ioctl VIDIOC_ENUM_FMT — Enumerate image formats
ioctl VIDIOC_ENUM_FRAMESIZES — Enumerate frame sizes
ioctl VIDIOC_ENUM_FRAMEINTERVALS — Enumerate frame intervals
ioctl VIDIOC_ENUM_FREQ_BANDS — Enumerate supported frequency bands
ioctl VIDIOC_ENUMINPUT — Enumerate video inputs
ioctl VIDIOC_ENUMOUTPUT — Enumerate video outputs
ioctl VIDIOC_ENUMSTD — Enumerate supported video standards
ioctl VIDIOC_EXPBUF — Export a buffer as a DMABUF file descriptor.
ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO — Query or select the current audio input and its attributes
ioctl VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT — Query or select the current audio output
ioctl VIDIOC_G_CROP, VIDIOC_S_CROP — Get or set the current cropping rectangle
ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL — Get or set the value of a control
ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS — Get or set DV timings for input or output
ioctl VIDIOC_G_ENC_INDEX — Get meta data about a compressed video stream
ioctl VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, VIDIOC_TRY_EXT_CTRLS — Get or set the value of several controls, try control values
ioctl VIDIOC_G_FBUF, VIDIOC_S_FBUF — Get or set frame buffer overlay parameters
ioctl VIDIOC_G_FMT, VIDIOC_S_FMT, VIDIOC_TRY_FMT — Get or set the data format, try a format
ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY — Get or set tuner or modulator radio frequency
ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT — Query or select the current video input
ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP
ioctl VIDIOC_G_MODULATOR, VIDIOC_S_MODULATOR — Get or set modulator attributes
ioctl VIDIOC_G_OUTPUT, VIDIOC_S_OUTPUT — Query or select the current video output
ioctl VIDIOC_G_PARM, VIDIOC_S_PARM — Get or set streaming parameters
ioctl VIDIOC_G_PRIORITY, VIDIOC_S_PRIORITY — Query or request the access priority associated with a file descriptor
ioctl VIDIOC_G_SELECTION, VIDIOC_S_SELECTION — Get or set one of the selection rectangles
ioctl VIDIOC_G_SLICED_VBI_CAP — Query sliced VBI capabilities
ioctl VIDIOC_G_STD, VIDIOC_S_STD — Query or select the video standard of the current input
ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER — Get or set tuner attributes
ioctl VIDIOC_LOG_STATUS — Log driver status information
ioctl VIDIOC_OVERLAY — Start or stop video overlay
ioctl VIDIOC_PREPARE_BUF — Prepare a buffer for I/O
ioctl VIDIOC_QBUF, VIDIOC_DQBUF — Exchange a buffer with the driver
ioctl VIDIOC_QUERYBUF — Query the status of a buffer
ioctl VIDIOC_QUERYCAP — Query device capabilities
ioctl VIDIOC_QUERYCTRL, VIDIOC_QUERYMENU — Enumerate controls and menu control items
ioctl VIDIOC_QUERY_DV_TIMINGS — Sense the DV preset received by the current input
ioctl VIDIOC_QUERYSTD — Sense the video standard received by the current input
ioctl VIDIOC_REQBUFS — Initiate Memory Mapping or User Pointer I/O
ioctl VIDIOC_S_HW_FREQ_SEEK — Perform a hardware frequency seek
ioctl VIDIOC_STREAMON, VIDIOC_STREAMOFF — Start or stop streaming I/O
ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL — Enumerate frame intervals
ioctl VIDIOC_SUBDEV_ENUM_FRAME_SIZE — Enumerate media bus frame sizes
ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE — Enumerate media bus formats
ioctl VIDIOC_SUBDEV_G_CROP, VIDIOC_SUBDEV_S_CROP — Get or set the crop rectangle on a subdev pad
ioctl VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_S_EDID — Get or set the EDID of a video receiver/transmitter
ioctl VIDIOC_SUBDEV_G_FMT, VIDIOC_SUBDEV_S_FMT — Get or set the data format on a subdev pad
ioctl VIDIOC_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL — Get or set the frame interval on a subdev pad
ioctl VIDIOC_SUBDEV_G_SELECTION, VIDIOC_SUBDEV_S_SELECTION — Get or set selection rectangles on a subdev pad
ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT — Subscribe or unsubscribe event
V4L2 mmap() — Map device memory into application address space
V4L2 munmap() — Unmap device memory
V4L2 open() — Open a V4L2 device
V4L2 poll() — Wait for some event on a file descriptor
V4L2 read() — Read from a V4L2 device
V4L2 select() — Synchronous I/O multiplexing
V4L2 write() — Write to a V4L2 device

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