include/uapi/linux/usb/video.h

File Facts

System

Linux kernel

Corpus path

include/uapi/linux/usb/video.h

Extension

.h

Size

19116 bytes

Lines

661

Domain

Core OS

Bucket

Core Kernel Interface

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/types.h

Detected Declarations

• struct uvc_descriptor_header
• struct uvc_header_descriptor
• struct uvc_input_terminal_descriptor
• struct uvc_output_terminal_descriptor
• struct uvc_camera_terminal_descriptor
• struct uvc_selector_unit_descriptor
• struct uvc_processing_unit_descriptor
• struct uvc_extension_unit_descriptor
• struct uvc_control_endpoint_descriptor
• struct uvc_input_header_descriptor
• struct uvc_output_header_descriptor
• struct uvc_color_matching_descriptor
• struct uvc_streaming_control
• struct uvc_format_uncompressed
• struct uvc_frame_uncompressed
• struct uvc_format_mjpeg
• struct uvc_frame_mjpeg
• struct uvc_format_framebased
• struct uvc_frame_framebased
• enum uvc_color_primaries_values
• enum uvc_transfer_characteristics_values
• enum uvc_matrix_coefficients
• function UVC_HEADER_DESCRIPTOR
• function UVC_SELECTOR_UNIT_DESCRIPTOR
• function UVC_EXTENSION_UNIT_DESCRIPTOR
• function UVC_INPUT_HEADER_DESCRIPTOR
• function UVC_OUTPUT_HEADER_DESCRIPTOR
• function UVC_FRAME_UNCOMPRESSED
• function UVC_FRAME_MJPEG
• function UVC_FRAME_FRAMEBASED

Annotated Snippet

struct uvc_descriptor_header {
	__u8  bLength;
	__u8  bDescriptorType;
	__u8  bDescriptorSubType;
} __attribute__((packed));

/* 3.7.2. Video Control Interface Header Descriptor */
struct uvc_header_descriptor {
	__u8   bLength;
	__u8   bDescriptorType;
	__u8   bDescriptorSubType;
	__le16 bcdUVC;
	__le16 wTotalLength;
	__le32 dwClockFrequency;
	__u8   bInCollection;
	__u8   baInterfaceNr[];
} __attribute__((__packed__));

#define UVC_DT_HEADER_SIZE(n)				(12+(n))

#define UVC_HEADER_DESCRIPTOR(n) \
	uvc_header_descriptor_##n

#define DECLARE_UVC_HEADER_DESCRIPTOR(n)		\
struct UVC_HEADER_DESCRIPTOR(n) {			\
	__u8   bLength;					\
	__u8   bDescriptorType;				\
	__u8   bDescriptorSubType;			\
	__le16 bcdUVC;					\
	__le16 wTotalLength;				\
	__le32 dwClockFrequency;			\
	__u8   bInCollection;				\
	__u8   baInterfaceNr[n];			\
} __attribute__ ((packed))

/* 3.7.2.1. Input Terminal Descriptor */
struct uvc_input_terminal_descriptor {
	__u8   bLength;
	__u8   bDescriptorType;
	__u8   bDescriptorSubType;
	__u8   bTerminalID;
	__le16 wTerminalType;
	__u8   bAssocTerminal;
	__u8   iTerminal;
} __attribute__((__packed__));

#define UVC_DT_INPUT_TERMINAL_SIZE			8

/* 3.7.2.2. Output Terminal Descriptor */
struct uvc_output_terminal_descriptor {
	__u8   bLength;
	__u8   bDescriptorType;
	__u8   bDescriptorSubType;
	__u8   bTerminalID;
	__le16 wTerminalType;
	__u8   bAssocTerminal;
	__u8   bSourceID;
	__u8   iTerminal;
} __attribute__((__packed__));

#define UVC_DT_OUTPUT_TERMINAL_SIZE			9

/* 3.7.2.3. Camera Terminal Descriptor */
struct uvc_camera_terminal_descriptor {
	__u8   bLength;
	__u8   bDescriptorType;
	__u8   bDescriptorSubType;
	__u8   bTerminalID;
	__le16 wTerminalType;
	__u8   bAssocTerminal;
	__u8   iTerminal;
	__le16 wObjectiveFocalLengthMin;
	__le16 wObjectiveFocalLengthMax;
	__le16 wOcularFocalLength;
	__u8   bControlSize;
	__u8   bmControls[3];
} __attribute__((__packed__));

#define UVC_DT_CAMERA_TERMINAL_SIZE(n)			(15+(n))

/* 3.7.2.4. Selector Unit Descriptor */
struct uvc_selector_unit_descriptor {
	__u8  bLength;
	__u8  bDescriptorType;
	__u8  bDescriptorSubType;
	__u8  bUnitID;
	__u8  bNrInPins;
	__u8  baSourceID[0];
	__u8  iSelector;
} __attribute__((__packed__));

Annotation

• Immediate include surface: `linux/types.h`.
• Detected declarations: `struct uvc_descriptor_header`, `struct uvc_header_descriptor`, `struct uvc_input_terminal_descriptor`, `struct uvc_output_terminal_descriptor`, `struct uvc_camera_terminal_descriptor`, `struct uvc_selector_unit_descriptor`, `struct uvc_processing_unit_descriptor`, `struct uvc_extension_unit_descriptor`, `struct uvc_control_endpoint_descriptor`, `struct uvc_input_header_descriptor`.
• Atlas domain: Core OS / Core Kernel Interface.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.