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media: v4l2-common: Add an helper to apply frmsize constraints

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The rockchip VPU driver is open-coding this logic which seems pretty
generic. Let's provide an helper to apply the min/max and alignment
constraints on width/height.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Boris Brezillon 2019-05-28 13:02:18 -04:00 committed by Mauro Carvalho Chehab
parent ce57a82f8a
commit 32cddf9c94
2 changed files with 29 additions and 0 deletions
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27
drivers/media/v4l2-core/v4l2-common.c
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@ -321,6 +321,16 @@ static unsigned int clamp_align(unsigned int x, unsigned int min,
return x;
}
static unsigned int clamp_roundup(unsigned int x, unsigned int min,
unsigned int max, unsigned int alignment)
{
x = clamp(x, min, max);
if (alignment)
x = round_up(x, alignment);
return x;
}
void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
unsigned int walign,
u32 *h, unsigned int hmin, unsigned int hmax,
@ -531,6 +541,23 @@ static inline unsigned int v4l2_format_block_height(const struct v4l2_format_inf
return info->block_h[plane];
}
void v4l2_apply_frmsize_constraints(u32 *width, u32 *height,
const struct v4l2_frmsize_stepwise *frmsize)
{
if (!frmsize)
return;
/*
* Clamp width/height to meet min/max constraints and round it up to
* macroblock alignment.
*/
*width = clamp_roundup(*width, frmsize->min_width, frmsize->max_width,
frmsize->step_width);
*height = clamp_roundup(*height, frmsize->min_height, frmsize->max_height,
frmsize->step_height);
}
EXPORT_SYMBOL_GPL(v4l2_apply_frmsize_constraints);
int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt,
u32 pixelformat, u32 width, u32 height)
{

2
include/media/v4l2-common.h
View File

@ -420,6 +420,8 @@ struct v4l2_format_info {
const struct v4l2_format_info *v4l2_format_info(u32 format);
void v4l2_apply_frmsize_constraints(u32 *width, u32 *height,
const struct v4l2_frmsize_stepwise *frmsize);
int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat,
u32 width, u32 height);
int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat,