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Add white balance temperature control through 'w/W' keys.

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From Laurence Tratt.

ok matthieu@
This commit is contained in:
mglocker 2020-07-17 07:51:23 +00:00
parent a9988a58be
commit 861ff31951
2 changed files with 61 additions and 6 deletions
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14
app/video/video.1
View File

@ -1,4 +1,4 @@
.\" $OpenBSD: video.1,v 1.14 2019/02/25 12:34:35 rapha Exp $
.\" $OpenBSD: video.1,v 1.15 2020/07/17 07:51:23 mglocker Exp $
.\"
.\" Copyright (c) 2010 Jacob Meuser <jakemsr@openbsd.org>
.\"
@ -15,7 +15,7 @@
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.\"
.Dd $Mdocdate: February 25 2019 $
.Dd $Mdocdate: July 17 2020 $
.Dt VIDEO 1
.Os
.Sh NAME
@ -66,8 +66,8 @@ written to
.Ar output
and displayed via
.Xr Xv 3 .
The acutance, brightness, contrast, gain, gamma, hue and saturation
controls of
The acutance, brightness, contrast, gain, gamma, hue, saturation and white
balance temperature controls of
.Ar file
can also be adjusted if
.Ar file
@ -294,6 +294,12 @@ Increase saturation control of
.It Ic s
Decrease saturation control of
.Ar file .
.It Ic W
Increase white balance temperature control of
.Ar file .
.It Ic w
Decrease white balance temperature control of
.Ar file .
.El
.Sh EXAMPLES
The following command will read YUY2 encoded, 640 pixel wide and 480 pixel

53
app/video/video.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: video.c,v 1.30 2020/07/01 06:45:24 feinerer Exp $ */
/* $OpenBSD: video.c,v 1.31 2020/07/17 07:51:23 mglocker Exp $ */
/*
* Copyright (c) 2010 Jacob Meuser <jakemsr@openbsd.org>
*
@ -114,7 +114,10 @@ struct dev_ctrls {
{ "gamma", 0, V4L2_CID_GAMMA, 0, 0, 0, 0, 0 },
#define CTRL_SHARPNESS 6
{ "sharpness", 0, V4L2_CID_SHARPNESS, 0, 0, 0, 0, 0 },
#define CTRL_LAST 7
#define CTRL_WHITE_BALANCE_TEMPERATURE 7
{ "white_balance_temperature",
0, V4L2_CID_WHITE_BALANCE_TEMPERATURE, 0, 0, 0, 0, 0 },
#define CTRL_LAST 8
{ NULL, 0, 0, 0, 0, 0, 0, 0 }
};
@ -210,6 +213,7 @@ void dev_dump_info(struct video *);
void dev_dump_query(struct video *);
int dev_init(struct video *);
void dev_set_ctrl(struct video *, int, int);
void dev_set_ctrl_auto_white_balance(struct video *, int);
void dev_reset_ctrls(struct video *);
int parse_size(struct video *);
@ -730,6 +734,16 @@ display_event(struct video *vid)
if (vid->mode & M_IN_DEV)
dev_set_ctrl(vid, CTRL_SATURATION, -1);
break;
case 'W':
if (vid->mode & M_IN_DEV)
dev_set_ctrl(vid,
CTRL_WHITE_BALANCE_TEMPERATURE, 10);
break;
case 'w':
if (vid->mode & M_IN_DEV)
dev_set_ctrl(vid,
CTRL_WHITE_BALANCE_TEMPERATURE, -10);
break;
default:
break;
}
@ -1011,6 +1025,13 @@ dev_set_ctrl(struct video *vid, int ctrl, int change)
ctrls[ctrl].name, d->path);
return;
}
if (ctrl == CTRL_WHITE_BALANCE_TEMPERATURE) {
/*
* The spec requires auto-white balance to be off before
* we can set the white balance temperature.
*/
dev_set_ctrl_auto_white_balance(vid, 0);
}
val = ctrls[ctrl].cur + ctrls[ctrl].step * change;
if (val > ctrls[ctrl].max)
val = ctrls[ctrl].max;
@ -1033,6 +1054,23 @@ dev_set_ctrl(struct video *vid, int ctrl, int change)
ctrls[ctrl].cur);
}
void
dev_set_ctrl_auto_white_balance(struct video *vid, int toggle)
{
struct dev *d = &vid->dev;
struct v4l2_control control;
control.id = V4L2_CID_AUTO_WHITE_BALANCE;
if (ioctl(d->fd, VIDIOC_G_CTRL, &control) != 0)
warn("VIDIOC_G_CTRL");
if (control.value == toggle)
return;
control.value = toggle;
if (ioctl(d->fd, VIDIOC_S_CTRL, &control) != 0)
warn("VIDIOC_S_CTRL");
}
void
dev_reset_ctrls(struct video *vid)
{
@ -1043,6 +1081,14 @@ dev_reset_ctrls(struct video *vid)
for (i = 0; i < CTRL_LAST; i++) {
if (!ctrls[i].supported)
continue;
if (i == CTRL_WHITE_BALANCE_TEMPERATURE) {
/*
* We might be asked to reset before the white balance
* temperature has been adjusted, so we need to make
* sure that auto-white balance really is off.
*/
dev_set_ctrl_auto_white_balance(vid, 0);
}
control.id = ctrls[i].id;
control.value = ctrls[i].def;
if (ioctl(d->fd, VIDIOC_S_CTRL, &control) != 0)
@ -1054,6 +1100,9 @@ dev_reset_ctrls(struct video *vid)
if (vid->verbose > 0)
fprintf(stderr, "%s now %d\n", ctrls[i].name,
ctrls[i].cur);
if (i == CTRL_WHITE_BALANCE_TEMPERATURE) {
dev_set_ctrl_auto_white_balance(vid, 1);
}
}
}