Video capture and processing controls

Functions for manipulating device settings and stream parameters. More...

Functions
int	uvc_get_ctrl (uvc_device_handle_t *devh, uint8_t unit, uint8_t ctrl, void *data, int len, enum uvc_req_code req_code)
	Perform a GET_* request from an extension unit. More...
int	uvc_get_ctrl_len (uvc_device_handle_t *devh, uint8_t unit, uint8_t ctrl)
	Get the length of a control on a terminal or unit. More...
int	uvc_set_ctrl (uvc_device_handle_t *devh, uint8_t unit, uint8_t ctrl, void *data, int len)
	Perform a SET_CUR request to a terminal or unit. More...

Detailed Description

Functions for manipulating device settings and stream parameters.

The uvc_get_* and uvc_set_* functions are used to read and write the settings associated with the device's input, processing and output units.

Function Documentation

int uvc_get_ctrl	(	uvc_device_handle_t *	devh,
		uint8_t	unit,
		uint8_t	ctrl,
		void *	data,
		int	len,
		enum uvc_req_code	req_code
	)

Perform a GET_* request from an extension unit.

Parameters

devh	UVC device handle
unit	Unit ID; obtain this from the uvc_extension_unit_t describing the extension unit
ctrl	Control number to query
data	Data buffer to be filled by the device
len	Size of data buffer
req_code	GET_* request to execute

Returns

On success, the number of bytes actually transferred. Otherwise, a uvc_error_t error describing the error encountered.

Definition at line 90 of file ctrl.c.

int uvc_get_ctrl_len	(	uvc_device_handle_t *	devh,
		uint8_t	unit,
		uint8_t	ctrl
	)

Get the length of a control on a terminal or unit.

Parameters

devh	UVC device handle
unit	Unit or Terminal ID; obtain this from the uvc_extension_unit_t describing the extension unit
ctrl	Vendor-specific control number to query

Returns

On success, the length of the control as reported by the device. Otherwise, a uvc_error_t error describing the error encountered.

Definition at line 59 of file ctrl.c.

int uvc_set_ctrl	(	uvc_device_handle_t *	devh,
		uint8_t	unit,
		uint8_t	ctrl,
		void *	data,
		int	len
	)

Perform a SET_CUR request to a terminal or unit.

Parameters

devh	UVC device handle
unit	Unit or Terminal ID
ctrl	Control number to set
data	Data buffer to be sent to the device
len	Size of data buffer

Returns

On success, the number of bytes actually transferred. Otherwise, a uvc_error_t error describing the error encountered.

Definition at line 113 of file ctrl.c.