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.
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.
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.

---

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.