callback.c

/*************************************************************************
 * Source: le pilote uvcvideo (voir le répertoire /home/ELE784/uvc
 *         pour les fichiers sources)
 ************************************************************************/

static void complete_callback(struct urb *urb){

	int ret;
	int i;	
	unsigned char * data;
	unsigned int len;
	unsigned int maxlen;
	unsigned int nbytes;
	void * mem;

	if(urb->status == 0){
		
		for (i = 0; i < urb->number_of_packets; ++i) {
			if(myStatus == 1){
				continue;
			}
			if (urb->iso_frame_desc[i].status < 0) {
				continue;
			}
			
			data = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
			if(data[1] & (1 << 6)){
				continue;
			}
			len = urb->iso_frame_desc[i].actual_length;
			if (len < 2 || data[0] < 2 || data[0] > len){
				continue;
			}
		
			len -= data[0];
			maxlen = myLength - myLengthUsed ;
			mem = myData + myLengthUsed;
			nbytes = min(len, maxlen);
			memcpy(mem, data + data[0], nbytes);
			myLengthUsed += nbytes;
	
			if (len > maxlen) {				
				myStatus = 1; // DONE
			}
	
			/* Mark the buffer as done if the EOF marker is set. */
			if ((data[1] & (1 << 1)) && (myLengthUsed != 0)) {						
				myStatus = 1; // DONE
			}					
		}
	
		if (!(myStatus == 1)){				
			if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
				//printk(KERN_WARNING "");
			}
		}else{
			///////////////////////////////////////////////////////////////////////
			//  Synchronisation
			///////////////////////////////////////////////////////////////////////
		}			
	}else{
		//printk(KERN_WARNING "");
	}
}