linux/drivers/media/usb/uvc/uvc_isight.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *      uvc_isight.c  --  USB Video Class driver - iSight support
 *
 *	Copyright (C) 2006-2007
 *		Ivan N. Zlatev <[email protected]>
 *	Copyright (C) 2008-2009
 *		Laurent Pinchart <[email protected]>
 */

#include <linux/usb.h>
#include <linux/kernel.h>
#include <linux/mm.h>

#include "uvcvideo.h"

/*
 * Built-in iSight webcams implements most of UVC 1.0 except a
 * different packet format. Instead of sending a header at the
 * beginning of each isochronous transfer payload, the webcam sends a
 * single header per image (on its own in a packet), followed by
 * packets containing data only.
 *
 * Offset   Size (bytes)	Description
 * ------------------------------------------------------------------
 * 0x00	1	Header length
 * 0x01	1	Flags (UVC-compliant)
 * 0x02	4	Always equal to '11223344'
 * 0x06	8	Always equal to 'deadbeefdeadface'
 * 0x0e	16	Unknown
 *
 * The header can be prefixed by an optional, unknown-purpose byte.
 */

static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf,
		const u8 *data, unsigned int len)
{ … }

void uvc_video_decode_isight(struct uvc_urb *uvc_urb, struct uvc_buffer *buf,
			struct uvc_buffer *meta_buf)
{ … }