Hi Chetan, On Tuesday 18 June 2013 11:17:40 Chetan Nanda wrote: > Hi, > > I am currently working with UVC camera device which send data using > bulk transfer for preview and capture. > I have modified UVC gadget driver to start bulk streaming on receiving > first UVC_VS_COMMIT_CONTROL request from host side. > But currently not able to detect when to stop the streaming. > > I am running Cheese Application on host side to test start/stop streaming. > UVC gadget driver's 'uvc_function_set_alt' function is getting called > when closing the cheese application, but this function is also > (sometime) getting called when starting the cheese application on HOST > side, also some time this function gets called after receiving first > COMMIT_CONTROL. > > So, currently I am not able to find a proper way for starting / > stopping streaming for UVC bulk transfer. > Anyone has successfully implemented the start/stop streaming usecase > for bulk mode? That's in my opinion one of the shortcomings of the UVC specification. There is no explicit way to start streaming on bulk endpoints. One option would be to start streaming when receiving the first IN token on the bulk endpoint, and to stop streaming when no bulk activity has been detected for a given amount of time. A bit hackish, but I'm not sure if there's any other practical way. > Any pointer would be very helpful. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
