static int fill_cam_struct(IOUSBDeviceInterface197 **devIf,
uvccCam *cam)
{
IOReturn ior;
if((ior = (*devIf)->GetLocationID(devIf, &(cam->idLocation))) != kIOReturnSuccess)
{
uvcc_err("fill_cam_struct: GetLocationID", ior);
return -1;
}
if((get_dev_desc(devIf, &(cam->devDesc))) != 0)
{
if(!logger) perror("uvcc error! fill_cam_struct: Could not retrieve device descriptor");
else asl_log(logger, NULL, ASL_LEVEL_ERR, "fill_cam_struct: Could not retrieve device descriptor: %s", strerror(errno));
return -1;
}
cam->mID = (struct uvccModelID *)&(cam->devDesc.hwIdVendor);
cam->devIf = devIf;
if((cam->ctrlIf = get_ctrl_if(devIf)) == NULL)
{
(*(cam->devIf))->Release(cam->devIf);
CFRelease(cam->regName);
if(!logger) perror("uvcc error! fill_cam_struct: Could not retrieve control interface");
else asl_log(logger, NULL, ASL_LEVEL_ERR, "fill_cam_struct: Could not retrieve control interface: %s", strerror(errno));
return -1;
}
if((ior = (*(cam->ctrlIf))->GetInterfaceNumber(cam->ctrlIf, &(cam->ifNo))) != kIOReturnSuccess)
{
(*(cam->devIf))->Release(cam->devIf);
(*(cam->ctrlIf))->Release(cam->ctrlIf);
uvcc_err("fill_cam_struct: GetInterfaceNumber", ior);
return -1;
}
return 0;
}
error handle::get_desc(uint16_t desc, void *buf, size_t& buf_sz)
{
std::unique_lock<std::recursive_mutex> lock(m_mutex);
/* get a pointer so that it's not destroyed during the runtime of the function,
* the pointer will be released at the end of the function */
std::shared_ptr<context> ctx = m_dev->get_context();
if(!ctx)
return error::NO_CONTEXT;
/* ensure valid status */
error err = status();
if(err != error::SUCCESS)
return err;
return get_dev_desc(desc, buf, buf_sz);
}
error handle::get_dev_desc(uint16_t desc, void *buf, size_t& buf_sz)
{
auto p = m_hwdev.lock();
return p ? p->get_dev_desc(desc, buf, buf_sz) : error::DISCONNECTED;
}
