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[media] v4l2-dv-timings: add helpers for vic and pixelaspect ratio 

Add a helper to find timings based on the CEA-861 VIC code. Also,
add a helper that returns the pixel aspect ratio based on the
v4l2_dv_timings struct.

[mchehab@s-opensource.com: fix coding style]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil 2016-07-14 07:59:12 -03:00 committed by Mauro Carvalho Chehab
parent cf0381205d
commit 652430763f
3 changed files with 77 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/media/v4l2-core/Kconfig
View File

@ -6,6 +6,7 @@
config VIDEO_V4L2
tristate
depends on (I2C || I2C=n) && VIDEO_DEV
select RATIONAL
default (I2C || I2C=n) && VIDEO_DEV
config VIDEO_ADV_DEBUG

59
drivers/media/v4l2-core/v4l2-dv-timings.c
View File

@ -22,6 +22,7 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/rational.h>
#include <linux/videodev2.h>
#include <linux/v4l2-dv-timings.h>
#include <media/v4l2-dv-timings.h>
@ -224,6 +225,24 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
}
EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic)
{
unsigned int i;
for (i = 0; i < v4l2_dv_timings_presets[i].bt.width; i++) {
const struct v4l2_bt_timings *bt =
&v4l2_dv_timings_presets[i].bt;
if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) &&
bt->cea861_vic == vic) {
*t = v4l2_dv_timings_presets[i];
return true;
}
}
return false;
}
EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic);
/**
* v4l2_match_dv_timings - check if two timings match
* @t1 - compare this v4l2_dv_timings struct...
@ -306,7 +325,8 @@ void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
(bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
bt->il_vsync, bt->il_vbackporch);
pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s\n", dev_prefix, bt->flags,
pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s%s%s%s\n",
dev_prefix, bt->flags,
(bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
" REDUCED_BLANKING" : "",
((bt->flags & V4L2_DV_FL_REDUCED_BLANKING) &&
@ -320,16 +340,51 @@ void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
(bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ?
" CE_VIDEO" : "",
(bt->flags & V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE) ?
" FIRST_FIELD_EXTRA_LINE" : "");
" FIRST_FIELD_EXTRA_LINE" : "",
(bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) ?
" HAS_PICTURE_ASPECT" : "",
(bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) ?
" HAS_CEA861_VIC" : "",
(bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) ?
" HAS_HDMI_VIC" : "");
pr_info("%s: standards (0x%x):%s%s%s%s%s\n", dev_prefix, bt->standards,
(bt->standards & V4L2_DV_BT_STD_CEA861) ? " CEA" : "",
(bt->standards & V4L2_DV_BT_STD_DMT) ? " DMT" : "",
(bt->standards & V4L2_DV_BT_STD_CVT) ? " CVT" : "",
(bt->standards & V4L2_DV_BT_STD_GTF) ? " GTF" : "",
(bt->standards & V4L2_DV_BT_STD_SDI) ? " SDI" : "");
if (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT)
pr_info("%s: picture aspect (hor:vert): %u:%u\n", dev_prefix,
bt->picture_aspect.numerator,
bt->picture_aspect.denominator);
if (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC)
pr_info("%s: CEA-861 VIC: %u\n", dev_prefix, bt->cea861_vic);
if (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC)
pr_info("%s: HDMI VIC: %u\n", dev_prefix, bt->hdmi_vic);
}
EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t)
{
struct v4l2_fract ratio = { 1, 1 };
unsigned long n, d;
if (t->type != V4L2_DV_BT_656_1120)
return ratio;
if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT))
return ratio;
ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator;
ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator;
rational_best_approximation(ratio.numerator, ratio.denominator,
ratio.numerator, ratio.denominator, &n, &d);
ratio.numerator = n;
ratio.denominator = d;
return ratio;
}
EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
/*
* CVT defines
* Based on Coordinated Video Timings Standard

20
include/media/v4l2-dv-timings.h
View File

@ -100,13 +100,23 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
v4l2_check_dv_timings_fnc fnc,
void *fnc_handle);
/**
* v4l2_find_dv_timings_cea861_vic() - find timings based on CEA-861 VIC
* @t: the timings data.
* @vic: CEA-861 VIC code
*
* On success it will fill in @t with the found timings and it returns true.
* On failure it will return false.
*/
bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic);
/**
* v4l2_match_dv_timings() - do two timings match?
*
* @measured: the measured timings data.
* @standard: the timings according to the standard.
* @pclock_delta: maximum delta in Hz between standard->pixelclock and
* the measured timings.
* the measured timings.
* @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
* match.
*
@ -185,6 +195,14 @@ bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
*/
struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
/**
* v4l2_dv_timings_aspect_ratio - calculate the aspect ratio based on the
* v4l2_dv_timings information.
*
* @t: the timings data.
*/
struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t);
/*
* reduce_fps - check if conditions for reduced fps are true.
* bt - v4l2 timing structure