uvc_compat.h

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef _UVC_COMPAT_H
#define _UVC_COMPAT_H

#include <linux/version.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
/*
 * Extended control API
 */
struct v4l2_ext_control
{
    __u32 id;
    __u32 reserved2[2];
    union
    {
        __s32 value;
        __s64 value64;
        void *reserved;
    };
} __attribute__((packed));

struct v4l2_ext_controls
{
    __u32 ctrl_class;
    __u32 count;
    __u32 error_idx;
    __u32 reserved[2];
    struct v4l2_ext_control *controls;
};

/* Values for ctrl_class field */
#define V4L2_CTRL_CLASS_USER		0x00980000	/* Old-style 'user' controls */
#define V4L2_CTRL_CLASS_MPEG		0x00990000	/* MPEG-compression controls */

#define V4L2_CTRL_ID_MASK		(0x0fffffff)
#define V4L2_CTRL_ID2CLASS(id)		((id) & 0x0fff0000UL)
#define V4L2_CTRL_DRIVER_PRIV(id)	(((id) & 0xffff) >= 0x1000)

/* User-class control IDs defined by V4L2 */
#undef	V4L2_CID_BASE
#define V4L2_CID_BASE			(V4L2_CTRL_CLASS_USER | 0x900)
#define V4L2_CID_USER_BASE		V4L2_CID_BASE
#define V4L2_CID_USER_CLASS		(V4L2_CTRL_CLASS_USER | 1)

#define VIDIOC_G_EXT_CTRLS		_IOWR ('V', 71, struct v4l2_ext_controls)
#define VIDIOC_S_EXT_CTRLS		_IOWR ('V', 72, struct v4l2_ext_controls)
#define VIDIOC_TRY_EXT_CTRLS		_IOWR ('V', 73, struct v4l2_ext_controls)

#endif

#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
/*
 * Frame size and frame rate enumeration
 *
 * Included in Linux 2.6.19
 */
enum v4l2_frmsizetypes
{
    V4L2_FRMSIZE_TYPE_DISCRETE	= 1,
    V4L2_FRMSIZE_TYPE_CONTINUOUS	= 2,
    V4L2_FRMSIZE_TYPE_STEPWISE	= 3,
};

struct v4l2_frmsize_discrete
{
    __u32			width;		/* Frame width [pixel] */
    __u32			height;		/* Frame height [pixel] */
};

struct v4l2_frmsize_stepwise
{
    __u32			min_width;	/* Minimum frame width [pixel] */
    __u32			max_width;	/* Maximum frame width [pixel] */
    __u32			step_width;	/* Frame width step size [pixel] */
    __u32			min_height;	/* Minimum frame height [pixel] */
    __u32			max_height;	/* Maximum frame height [pixel] */
    __u32			step_height;	/* Frame height step size [pixel] */
};

struct v4l2_frmsizeenum
{
    __u32			index;		/* Frame size number */
    __u32			pixel_format;	/* Pixel format */
    __u32			type;		/* Frame size type the device supports. */

    union  					/* Frame size */
    {
        struct v4l2_frmsize_discrete	discrete;
        struct v4l2_frmsize_stepwise	stepwise;
    };

    __u32   reserved[2];			/* Reserved space for future use */
};

enum v4l2_frmivaltypes
{
    V4L2_FRMIVAL_TYPE_DISCRETE	= 1,
    V4L2_FRMIVAL_TYPE_CONTINUOUS	= 2,
    V4L2_FRMIVAL_TYPE_STEPWISE	= 3,
};

struct v4l2_frmival_stepwise
{
    struct v4l2_fract	min;		/* Minimum frame interval [s] */
    struct v4l2_fract	max;		/* Maximum frame interval [s] */
    struct v4l2_fract	step;		/* Frame interval step size [s] */
};

struct v4l2_frmivalenum
{
    __u32			index;		/* Frame format index */
    __u32			pixel_format;	/* Pixel format */
    __u32			width;		/* Frame width */
    __u32			height;		/* Frame height */
    __u32			type;		/* Frame interval type the device supports. */

    union  					/* Frame interval */
    {
        struct v4l2_fract		discrete;
        struct v4l2_frmival_stepwise	stepwise;
    };

    __u32	reserved[2];			/* Reserved space for future use */
};

#define VIDIOC_ENUM_FRAMESIZES		_IOWR ('V', 74, struct v4l2_frmsizeenum)
#define VIDIOC_ENUM_FRAMEINTERVALS	_IOWR ('V', 75, struct v4l2_frmivalenum)
#endif


#endif /* _UVC_COMPAT_H */