Differences between UVC 1.0 and UVC 1.1

When you design UVC-compliant hardware to work with Windows 7 or earlier version of Windows, you must decide between supporting UVC 1.0 and 1.1.

A device that is compliant with UVC 1.1 should set the bcdUVC flag in the Class-Specific VC Interface to 0x110. In addition, if the optional Processing Unit descriptor exists, a 1.1-compliant device should do the following:

1. Add a bmVideoStandards field to the Processing Unit descriptor.

2. Update the bLength field in the Processing Unit.

3. Update wTotalLength to reflect the larger PU size of the Processing Unit.

The following table summarizes the differences between UVC 1.0 and 1.1.

Status	Descriptor/Request/Control	Field	Comments
change	Class-Specific VC Interface	bcdUVC	0x110 for 1.1, 0x100 for 1.0
obsolete	Class-Specific VC Interface	dwClockFrequency	Unused for 1.1
change	Processing Unit	bLength	10+n for 1.1, 9+n for 1.0
new	Processing Unit	bmVideoStandards
change	Class-Specific VS Interface Input Header	bmaControls(n)	1.1 uses some of these bits differently in "Probe and Commit"
change	Class-Specific VS Interface Output Header	bLength	9+(p*n) for 1.1, 8 for 1.0
new	Class-Specific VS Interface Output Header	bControlSize
new	Class-Specific VS Interface Output Header	bmaControls(n)
obsolete	Interface Control	VC_REQUEST_INDICATE_HOST_CLOCK_CONTROL	Mandatory for 1.0 devices supporting host to device payloads that use SCR/PTS
new	Interface Control	GET_INFO
new	Processing Unit	PU_DIGITAL_MULTIPLIER_CONTROL
new	Processing Unit	PU_ANALOG_VIDEO_STANDARD_CONTROL
new	Processing Unit	PU_ANALOG_LOCK_STATUS_CONTROL
change	Video Probe and Commit Control	wLength	34 for 1.1, 26 for 1.0
new	Video Probe and Commit Control	dwClockFrequency
new	Video Probe and Commit Control	bmFramingInfo
new	Video Probe and Commit Control	bPreferredVersion
new	Video Probe and Commit Control	bMinVersion
new	Video Probe and Commit Control	bMaxVersion
new	Video Probe and Commit Control	GET_INFO for VS_PROBE_CONTROL
new	Video Probe and Commit Control	GET_INFO for VS_COMMIT_CONTROL
obsolete	Class-Specific VS Interface	VS_FORMAT_MPEG1	Not supported by any Windows operating system
obsolete	Class-Specific VS Interface	VS_FORMAT_MPEG2PS	Not supported by any Windows operating system
obsolete	Class-Specific VS Interface	VS_FORMAT_MPEG4SL	Not supported by any Windows operating system
obsolete	Class-Specific VS Interface	VS_FORMAT_VENDOR	Not supported by any Windows operating system
obsolete	Class-Specific VS Interface	VS_FRAME_VENDOR
new	Class-Specific VS Interface	VS_FORMAT_FRAME_BASED
new	Class-Specific VS Interface	VS_FRAME_FRAME_BASED
new	Class-Specific VS Interface	VS_FORMAT_STREAM_BASED

For UVC 1.0 devices, the length of the MPEG2TS format descriptor is 7. Because UVC 1.1 includes a new 16 byte GUID field, the length of the MPEG2TS format descriptor is 23.

Accordingly, if you update the MPEG2TS descriptor to 23 bytes, you must also set the bcdUVC flag in the Class-Specific VC Interface to 0x110.