V4L/DVB (4672): Frame format enumeration (1/2)

Add VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS ioctls to enumerate 
supported frame sizes and frame intervals.

Signed-off-by: Martin Rubli <martin.rubli@epfl.ch>
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

include/linux/videodev2.h

@@ -276,6 +276,79 @@ struct v4l2_fmtdesc
 
 #define V4L2_FMT_FLAG_COMPRESSED 0x0001
 
+/*
+ *	F R A M E   S I Z E   E N U M E R A T I O N
+ */
+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 */
+};
+
+/*
+ *	F R A M E   R A T E   E N U M E R A T I O N
+ */
+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 */
+};
+
 /*
  *	T I M E C O D E
  */
@@ -1249,6 +1322,8 @@ struct v4l2_streamparm
 #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)
+#define VIDIOC_ENUM_FRAMESIZES	_IOWR ('V', 74, struct v4l2_frmsizeenum)
+#define VIDIOC_ENUM_FRAMEINTERVALS	_IOWR ('V', 75, struct v4l2_frmivalenum)
 
 #ifdef __OLD_VIDIOC_
 /* for compatibility, will go away some day */