uvc_error_t uvc_set_pantilt_abs(uvc_device_handle_t *devh, int pan, int tilt) {
uint8_t data[8];
uvc_error_t ret;
INT_TO_DW(pan, data);
INT_TO_DW(tilt, data + 4);
ret = libusb_control_transfer(devh->usb_devh, REQ_TYPE_SET, UVC_SET_CUR,
UVC_CT_PANTILT_ABSOLUTE_CONTROL << 8,
// 1 << 8, /* = fixed ID(00) and wrong VideoControl interface descriptor subtype(UVC_VC_HEADER) on original libuvc */
devh->info->ctrl_if.input_term_descs->request,
data, sizeof(data), CTRL_TIMEOUT_MILLIS);
if (LIKELY(ret == sizeof(data)))
return UVC_SUCCESS;
else
return ret;
}
template<class T> void set_pu(uvc_device_handle_t * devh, int subdevice, uint8_t unit, uint8_t control, int value)
{
const int REQ_TYPE_SET = 0x21;
unsigned char buffer[4];
if(sizeof(T)==1) buffer[0] = value;
if(sizeof(T)==2) SHORT_TO_SW(value, buffer);
if(sizeof(T)==4) INT_TO_DW(value, buffer);
int status = libusb_control_transfer(devh->usb_devh, REQ_TYPE_SET, UVC_SET_CUR, control << 8, unit << 8 | (subdevice*2), buffer, sizeof(T), 0);
if(status < 0) throw std::runtime_error(to_string() << "libusb_control_transfer(...) returned " << libusb_error_name(status));
if(status != sizeof(T)) throw std::runtime_error("insufficient data written to usb");
}
uvc_error_t uvc_set_pantilt_abs(uvc_device_handle_t *devh, int pan, int tilt) {
uint8_t data[8];
uvc_error_t ret;
INT_TO_DW(pan, data);
INT_TO_DW(tilt, data + 4);
ret = libusb_control_transfer(
devh->usb_devh,
REQ_TYPE_SET, UVC_SET_CUR,
UVC_CT_PANTILT_ABSOLUTE_CONTROL << 8,
1 << 8,
data,
sizeof(data),
0);
if (ret == sizeof(data))
return UVC_SUCCESS;
else
return ret;
}
uvc_error_t uvc_set_wb_compo(uvc_device_handle_t *devh, uint32_t wb_compo) {
uint8_t data[4];
uvc_error_t ret;
INT_TO_DW(wb_compo, data);
ret = libusb_control_transfer(devh->usb_devh, REQ_TYPE_SET, UVC_SET_CUR,
UVC_PU_WHITE_BALANCE_COMPONENT_CONTROL << 8,
devh->info->ctrl_if.processing_unit_descs->request,
data, sizeof(data), CTRL_TIMEOUT_MILLIS);
if (LIKELY(ret == sizeof(data)))
return UVC_SUCCESS;
else
return ret;
}
uvc_error_t uvc_set_exposure_abs(uvc_device_handle_t *devh, int time) {
uint8_t data[4];
uvc_error_t ret;
INT_TO_DW(time, data);
ret = libusb_control_transfer(
devh->usb_devh,
REQ_TYPE_SET, UVC_SET_CUR,
UVC_CT_EXPOSURE_TIME_ABSOLUTE_CONTROL << 8,
1 << 8,
data,
sizeof(data),
0);
if (ret == sizeof(data))
return UVC_SUCCESS;
else
return ret;
}
