| Current File : //usr/include/linux/usb/video.h |
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* USB Video Class definitions.
*
* Copyright (C) 2009 Laurent Pinchart <laurent.pinchart@skynet.be>
*
* This file holds USB constants and structures defined by the USB Device
* Class Definition for Video Devices. Unless otherwise stated, comments
* below reference relevant sections of the USB Video Class 1.1 specification
* available at
*
* http://www.usb.org/developers/devclass_docs/USB_Video_Class_1_1.zip
*/
#ifndef __LINUX_USB_VIDEO_H
#define __LINUX_USB_VIDEO_H
#include <linux/types.h>
/* --------------------------------------------------------------------------
* UVC constants
*/
/* A.2. Video Interface Subclass Codes */
#define UVC_SC_UNDEFINED 0x00
#define UVC_SC_VIDEOCONTROL 0x01
#define UVC_SC_VIDEOSTREAMING 0x02
#define UVC_SC_VIDEO_INTERFACE_COLLECTION 0x03
/* A.3. Video Interface Protocol Codes */
#define UVC_PC_PROTOCOL_UNDEFINED 0x00
#define UVC_PC_PROTOCOL_15 0x01
/* A.5. Video Class-Specific VC Interface Descriptor Subtypes */
#define UVC_VC_DESCRIPTOR_UNDEFINED 0x00
#define UVC_VC_HEADER 0x01
#define UVC_VC_INPUT_TERMINAL 0x02
#define UVC_VC_OUTPUT_TERMINAL 0x03
#define UVC_VC_SELECTOR_UNIT 0x04
#define UVC_VC_PROCESSING_UNIT 0x05
#define UVC_VC_EXTENSION_UNIT 0x06
/* A.6. Video Class-Specific VS Interface Descriptor Subtypes */
#define UVC_VS_UNDEFINED 0x00
#define UVC_VS_INPUT_HEADER 0x01
#define UVC_VS_OUTPUT_HEADER 0x02
#define UVC_VS_STILL_IMAGE_FRAME 0x03
#define UVC_VS_FORMAT_UNCOMPRESSED 0x04
#define UVC_VS_FRAME_UNCOMPRESSED 0x05
#define UVC_VS_FORMAT_MJPEG 0x06
#define UVC_VS_FRAME_MJPEG 0x07
#define UVC_VS_FORMAT_MPEG2TS 0x0a
#define UVC_VS_FORMAT_DV 0x0c
#define UVC_VS_COLORFORMAT 0x0d
#define UVC_VS_FORMAT_FRAME_BASED 0x10
#define UVC_VS_FRAME_FRAME_BASED 0x11
#define UVC_VS_FORMAT_STREAM_BASED 0x12
/* A.7. Video Class-Specific Endpoint Descriptor Subtypes */
#define UVC_EP_UNDEFINED 0x00
#define UVC_EP_GENERAL 0x01
#define UVC_EP_ENDPOINT 0x02
#define UVC_EP_INTERRUPT 0x03
/* A.8. Video Class-Specific Request Codes */
#define UVC_RC_UNDEFINED 0x00
#define UVC_SET_CUR 0x01
#define UVC_GET_CUR 0x81
#define UVC_GET_MIN 0x82
#define UVC_GET_MAX 0x83
#define UVC_GET_RES 0x84
#define UVC_GET_LEN 0x85
#define UVC_GET_INFO 0x86
#define UVC_GET_DEF 0x87
/* A.9.1. VideoControl Interface Control Selectors */
#define UVC_VC_CONTROL_UNDEFINED 0x00
#define UVC_VC_VIDEO_POWER_MODE_CONTROL 0x01
#define UVC_VC_REQUEST_ERROR_CODE_CONTROL 0x02
/* A.9.2. Terminal Control Selectors */
#define UVC_TE_CONTROL_UNDEFINED 0x00
/* A.9.3. Selector Unit Control Selectors */
#define UVC_SU_CONTROL_UNDEFINED 0x00
#define UVC_SU_INPUT_SELECT_CONTROL 0x01
/* A.9.4. Camera Terminal Control Selectors */
#define UVC_CT_CONTROL_UNDEFINED 0x00
#define UVC_CT_SCANNING_MODE_CONTROL 0x01
#define UVC_CT_AE_MODE_CONTROL 0x02
#define UVC_CT_AE_PRIORITY_CONTROL 0x03
#define UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL 0x04
#define UVC_CT_EXPOSURE_TIME_RELATIVE_CONTROL 0x05
#define UVC_CT_FOCUS_ABSOLUTE_CONTROL 0x06
#define UVC_CT_FOCUS_RELATIVE_CONTROL 0x07
#define UVC_CT_FOCUS_AUTO_CONTROL 0x08
#define UVC_CT_IRIS_ABSOLUTE_CONTROL 0x09
#define UVC_CT_IRIS_RELATIVE_CONTROL 0x0a
#define UVC_CT_ZOOM_ABSOLUTE_CONTROL 0x0b
#define UVC_CT_ZOOM_RELATIVE_CONTROL 0x0c
#define UVC_CT_PANTILT_ABSOLUTE_CONTROL 0x0d
#define UVC_CT_PANTILT_RELATIVE_CONTROL 0x0e
#define UVC_CT_ROLL_ABSOLUTE_CONTROL 0x0f
#define UVC_CT_ROLL_RELATIVE_CONTROL 0x10
#define UVC_CT_PRIVACY_CONTROL 0x11
/* A.9.5. Processing Unit Control Selectors */
#define UVC_PU_CONTROL_UNDEFINED 0x00
#define UVC_PU_BACKLIGHT_COMPENSATION_CONTROL 0x01
#define UVC_PU_BRIGHTNESS_CONTROL 0x02
#define UVC_PU_CONTRAST_CONTROL 0x03
#define UVC_PU_GAIN_CONTROL 0x04
#define UVC_PU_POWER_LINE_FREQUENCY_CONTROL 0x05
#define UVC_PU_HUE_CONTROL 0x06
#define UVC_PU_SATURATION_CONTROL 0x07
#define UVC_PU_SHARPNESS_CONTROL 0x08
#define UVC_PU_GAMMA_CONTROL 0x09
#define UVC_PU_WHITE_BALANCE_TEMPERATURE_CONTROL 0x0a
#define UVC_PU_WHITE_BALANCE_TEMPERATURE_AUTO_CONTROL 0x0b
#define UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL 0x0c
#define UVC_PU_WHITE_BALANCE_COMPONENT_AUTO_CONTROL 0x0d
#define UVC_PU_DIGITAL_MULTIPLIER_CONTROL 0x0e
#define UVC_PU_DIGITAL_MULTIPLIER_LIMIT_CONTROL 0x0f
#define UVC_PU_HUE_AUTO_CONTROL 0x10
#define UVC_PU_ANALOG_VIDEO_STANDARD_CONTROL 0x11
#define UVC_PU_ANALOG_LOCK_STATUS_CONTROL 0x12
/* A.9.7. VideoStreaming Interface Control Selectors */
#define UVC_VS_CONTROL_UNDEFINED 0x00
#define UVC_VS_PROBE_CONTROL 0x01
#define UVC_VS_COMMIT_CONTROL 0x02
#define UVC_VS_STILL_PROBE_CONTROL 0x03
#define UVC_VS_STILL_COMMIT_CONTROL 0x04
#define UVC_VS_STILL_IMAGE_TRIGGER_CONTROL 0x05
#define UVC_VS_STREAM_ERROR_CODE_CONTROL 0x06
#define UVC_VS_GENERATE_KEY_FRAME_CONTROL 0x07
#define UVC_VS_UPDATE_FRAME_SEGMENT_CONTROL 0x08
#define UVC_VS_SYNC_DELAY_CONTROL 0x09
/* B.1. USB Terminal Types */
#define UVC_TT_VENDOR_SPECIFIC 0x0100
#define UVC_TT_STREAMING 0x0101
/* B.2. Input Terminal Types */
#define UVC_ITT_VENDOR_SPECIFIC 0x0200
#define UVC_ITT_CAMERA 0x0201
#define UVC_ITT_MEDIA_TRANSPORT_INPUT 0x0202
/* B.3. Output Terminal Types */
#define UVC_OTT_VENDOR_SPECIFIC 0x0300
#define UVC_OTT_DISPLAY 0x0301
#define UVC_OTT_MEDIA_TRANSPORT_OUTPUT 0x0302
/* B.4. External Terminal Types */
#define UVC_EXTERNAL_VENDOR_SPECIFIC 0x0400
#define UVC_COMPOSITE_CONNECTOR 0x0401
#define UVC_SVIDEO_CONNECTOR 0x0402
#define UVC_COMPONENT_CONNECTOR 0x0403
/* 2.4.2.2. Status Packet Type */
#define UVC_STATUS_TYPE_CONTROL 1
#define UVC_STATUS_TYPE_STREAMING 2
/* 2.4.3.3. Payload Header Information */
#define UVC_STREAM_EOH (1 << 7)
#define UVC_STREAM_ERR (1 << 6)
#define UVC_STREAM_STI (1 << 5)
#define UVC_STREAM_RES (1 << 4)
#define UVC_STREAM_SCR (1 << 3)
#define UVC_STREAM_PTS (1 << 2)
#define UVC_STREAM_EOF (1 << 1)
#define UVC_STREAM_FID (1 << 0)
/* 4.1.2. Control Capabilities */
#define UVC_CONTROL_CAP_GET (1 << 0)
#define UVC_CONTROL_CAP_SET (1 << 1)
#define UVC_CONTROL_CAP_DISABLED (1 << 2)
#define UVC_CONTROL_CAP_AUTOUPDATE (1 << 3)
#define UVC_CONTROL_CAP_ASYNCHRONOUS (1 << 4)
/* 3.9.2.6 Color Matching Descriptor Values */
enum uvc_color_primaries_values {
UVC_COLOR_PRIMARIES_UNSPECIFIED,
UVC_COLOR_PRIMARIES_BT_709_SRGB,
UVC_COLOR_PRIMARIES_BT_470_2_M,
UVC_COLOR_PRIMARIES_BT_470_2_B_G,
UVC_COLOR_PRIMARIES_SMPTE_170M,
UVC_COLOR_PRIMARIES_SMPTE_240M,
};
enum uvc_transfer_characteristics_values {
UVC_TRANSFER_CHARACTERISTICS_UNSPECIFIED,
UVC_TRANSFER_CHARACTERISTICS_BT_709,
UVC_TRANSFER_CHARACTERISTICS_BT_470_2_M,
UVC_TRANSFER_CHARACTERISTICS_BT_470_2_B_G,
UVC_TRANSFER_CHARACTERISTICS_SMPTE_170M,
UVC_TRANSFER_CHARACTERISTICS_SMPTE_240M,
UVC_TRANSFER_CHARACTERISTICS_LINEAR,
UVC_TRANSFER_CHARACTERISTICS_SRGB,
};
enum uvc_matrix_coefficients {
UVC_MATRIX_COEFFICIENTS_UNSPECIFIED,
UVC_MATRIX_COEFFICIENTS_BT_709,
UVC_MATRIX_COEFFICIENTS_FCC,
UVC_MATRIX_COEFFICIENTS_BT_470_2_B_G,
UVC_MATRIX_COEFFICIENTS_SMPTE_170M,
UVC_MATRIX_COEFFICIENTS_SMPTE_240M,
};
/* ------------------------------------------------------------------------
* UVC structures
*/
/* All UVC descriptors have these 3 fields at the beginning */
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__));
#define UVC_DT_SELECTOR_UNIT_SIZE(n) (6+(n))
#define UVC_SELECTOR_UNIT_DESCRIPTOR(n) \
uvc_selector_unit_descriptor_##n
#define DECLARE_UVC_SELECTOR_UNIT_DESCRIPTOR(n) \
struct UVC_SELECTOR_UNIT_DESCRIPTOR(n) { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubType; \
__u8 bUnitID; \
__u8 bNrInPins; \
__u8 baSourceID[n]; \
__u8 iSelector; \
} __attribute__ ((packed))
/* 3.7.2.5. Processing Unit Descriptor */
struct uvc_processing_unit_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bUnitID;
__u8 bSourceID;
__le16 wMaxMultiplier;
__u8 bControlSize;
__u8 bmControls[2];
__u8 iProcessing;
__u8 bmVideoStandards;
} __attribute__((__packed__));
#define UVC_DT_PROCESSING_UNIT_SIZE(n) (10+(n))
/* 3.7.2.6. Extension Unit Descriptor */
struct uvc_extension_unit_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bUnitID;
__u8 guidExtensionCode[16];
__u8 bNumControls;
__u8 bNrInPins;
__u8 baSourceID[0];
__u8 bControlSize;
__u8 bmControls[0];
__u8 iExtension;
} __attribute__((__packed__));
#define UVC_DT_EXTENSION_UNIT_SIZE(p, n) (24+(p)+(n))
#define UVC_EXTENSION_UNIT_DESCRIPTOR(p, n) \
uvc_extension_unit_descriptor_##p_##n
#define DECLARE_UVC_EXTENSION_UNIT_DESCRIPTOR(p, n) \
struct UVC_EXTENSION_UNIT_DESCRIPTOR(p, n) { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubType; \
__u8 bUnitID; \
__u8 guidExtensionCode[16]; \
__u8 bNumControls; \
__u8 bNrInPins; \
__u8 baSourceID[p]; \
__u8 bControlSize; \
__u8 bmControls[n]; \
__u8 iExtension; \
} __attribute__ ((packed))
/* 3.8.2.2. Video Control Interrupt Endpoint Descriptor */
struct uvc_control_endpoint_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__le16 wMaxTransferSize;
} __attribute__((__packed__));
#define UVC_DT_CONTROL_ENDPOINT_SIZE 5
/* 3.9.2.1. Input Header Descriptor */
struct uvc_input_header_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bNumFormats;
__le16 wTotalLength;
__u8 bEndpointAddress;
__u8 bmInfo;
__u8 bTerminalLink;
__u8 bStillCaptureMethod;
__u8 bTriggerSupport;
__u8 bTriggerUsage;
__u8 bControlSize;
__u8 bmaControls[];
} __attribute__((__packed__));
#define UVC_DT_INPUT_HEADER_SIZE(n, p) (13+(n*p))
#define UVC_INPUT_HEADER_DESCRIPTOR(n, p) \
uvc_input_header_descriptor_##n_##p
#define DECLARE_UVC_INPUT_HEADER_DESCRIPTOR(n, p) \
struct UVC_INPUT_HEADER_DESCRIPTOR(n, p) { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubType; \
__u8 bNumFormats; \
__le16 wTotalLength; \
__u8 bEndpointAddress; \
__u8 bmInfo; \
__u8 bTerminalLink; \
__u8 bStillCaptureMethod; \
__u8 bTriggerSupport; \
__u8 bTriggerUsage; \
__u8 bControlSize; \
__u8 bmaControls[p][n]; \
} __attribute__ ((packed))
/* 3.9.2.2. Output Header Descriptor */
struct uvc_output_header_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bNumFormats;
__le16 wTotalLength;
__u8 bEndpointAddress;
__u8 bTerminalLink;
__u8 bControlSize;
__u8 bmaControls[];
} __attribute__((__packed__));
#define UVC_DT_OUTPUT_HEADER_SIZE(n, p) (9+(n*p))
#define UVC_OUTPUT_HEADER_DESCRIPTOR(n, p) \
uvc_output_header_descriptor_##n_##p
#define DECLARE_UVC_OUTPUT_HEADER_DESCRIPTOR(n, p) \
struct UVC_OUTPUT_HEADER_DESCRIPTOR(n, p) { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubType; \
__u8 bNumFormats; \
__le16 wTotalLength; \
__u8 bEndpointAddress; \
__u8 bTerminalLink; \
__u8 bControlSize; \
__u8 bmaControls[p][n]; \
} __attribute__ ((packed))
/* 3.9.2.6. Color matching descriptor */
struct uvc_color_matching_descriptor {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bColorPrimaries;
__u8 bTransferCharacteristics;
__u8 bMatrixCoefficients;
} __attribute__((__packed__));
#define UVC_DT_COLOR_MATCHING_SIZE 6
/* 4.3.1.1. Video Probe and Commit Controls */
struct uvc_streaming_control {
__u16 bmHint;
__u8 bFormatIndex;
__u8 bFrameIndex;
__u32 dwFrameInterval;
__u16 wKeyFrameRate;
__u16 wPFrameRate;
__u16 wCompQuality;
__u16 wCompWindowSize;
__u16 wDelay;
__u32 dwMaxVideoFrameSize;
__u32 dwMaxPayloadTransferSize;
__u32 dwClockFrequency;
__u8 bmFramingInfo;
__u8 bPreferedVersion;
__u8 bMinVersion;
__u8 bMaxVersion;
} __attribute__((__packed__));
/* Uncompressed Payload - 3.1.1. Uncompressed Video Format Descriptor */
struct uvc_format_uncompressed {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bFormatIndex;
__u8 bNumFrameDescriptors;
__u8 guidFormat[16];
__u8 bBitsPerPixel;
__u8 bDefaultFrameIndex;
__u8 bAspectRatioX;
__u8 bAspectRatioY;
__u8 bmInterfaceFlags;
__u8 bCopyProtect;
} __attribute__((__packed__));
#define UVC_DT_FORMAT_UNCOMPRESSED_SIZE 27
/* Uncompressed Payload - 3.1.2. Uncompressed Video Frame Descriptor */
struct uvc_frame_uncompressed {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bFrameIndex;
__u8 bmCapabilities;
__le16 wWidth;
__le16 wHeight;
__le32 dwMinBitRate;
__le32 dwMaxBitRate;
__le32 dwMaxVideoFrameBufferSize;
__le32 dwDefaultFrameInterval;
__u8 bFrameIntervalType;
__le32 dwFrameInterval[];
} __attribute__((__packed__));
#define UVC_DT_FRAME_UNCOMPRESSED_SIZE(n) (26+4*(n))
#define UVC_FRAME_UNCOMPRESSED(n) \
uvc_frame_uncompressed_##n
#define DECLARE_UVC_FRAME_UNCOMPRESSED(n) \
struct UVC_FRAME_UNCOMPRESSED(n) { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubType; \
__u8 bFrameIndex; \
__u8 bmCapabilities; \
__le16 wWidth; \
__le16 wHeight; \
__le32 dwMinBitRate; \
__le32 dwMaxBitRate; \
__le32 dwMaxVideoFrameBufferSize; \
__le32 dwDefaultFrameInterval; \
__u8 bFrameIntervalType; \
__le32 dwFrameInterval[n]; \
} __attribute__ ((packed))
/* MJPEG Payload - 3.1.1. MJPEG Video Format Descriptor */
struct uvc_format_mjpeg {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bFormatIndex;
__u8 bNumFrameDescriptors;
__u8 bmFlags;
__u8 bDefaultFrameIndex;
__u8 bAspectRatioX;
__u8 bAspectRatioY;
__u8 bmInterfaceFlags;
__u8 bCopyProtect;
} __attribute__((__packed__));
#define UVC_DT_FORMAT_MJPEG_SIZE 11
/* MJPEG Payload - 3.1.2. MJPEG Video Frame Descriptor */
struct uvc_frame_mjpeg {
__u8 bLength;
__u8 bDescriptorType;
__u8 bDescriptorSubType;
__u8 bFrameIndex;
__u8 bmCapabilities;
__le16 wWidth;
__le16 wHeight;
__le32 dwMinBitRate;
__le32 dwMaxBitRate;
__le32 dwMaxVideoFrameBufferSize;
__le32 dwDefaultFrameInterval;
__u8 bFrameIntervalType;
__le32 dwFrameInterval[];
} __attribute__((__packed__));
#define UVC_DT_FRAME_MJPEG_SIZE(n) (26+4*(n))
#define UVC_FRAME_MJPEG(n) \
uvc_frame_mjpeg_##n
#define DECLARE_UVC_FRAME_MJPEG(n) \
struct UVC_FRAME_MJPEG(n) { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubType; \
__u8 bFrameIndex; \
__u8 bmCapabilities; \
__le16 wWidth; \
__le16 wHeight; \
__le32 dwMinBitRate; \
__le32 dwMaxBitRate; \
__le32 dwMaxVideoFrameBufferSize; \
__le32 dwDefaultFrameInterval; \
__u8 bFrameIntervalType; \
__le32 dwFrameInterval[n]; \
} __attribute__ ((packed))
#endif /* __LINUX_USB_VIDEO_H */