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v4l2object: Only check CROPCAP for par once

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The pixel aspect ratio is documented to not change unless the TV
Standard is changed. So this mean that this will be uniform across all
possible format and resolutions.

https://bugzilla.gnome.org/show_bug.cgi?id=784674
This commit is contained in:
Nicolas Dufresne 2017-07-14 16:21:38 -04:00
parent 7e718d6039
commit 08643993df
1 changed files with 21 additions and 36 deletions
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57
sys/v4l2/gstv4l2object.c
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@ -1821,42 +1821,8 @@ gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
static void
gst_v4l2_object_add_aspect_ratio (GstV4l2Object * v4l2object, GstStructure * s)
{
struct v4l2_cropcap cropcap;
int num = 1, den = 1;
if (!v4l2object->keep_aspect)
return;
if (v4l2object->par) {
num = gst_value_get_fraction_numerator (v4l2object->par);
den = gst_value_get_fraction_denominator (v4l2object->par);
goto done;
}
memset (&cropcap, 0, sizeof (cropcap));
cropcap.type = v4l2object->type;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_CROPCAP, &cropcap) < 0)
goto cropcap_failed;
num = cropcap.pixelaspect.numerator;
den = cropcap.pixelaspect.denominator;
/* Ignore PAR that are 0/0 */
if (den == 0)
return;
done:
gst_structure_set (s, "pixel-aspect-ratio", GST_TYPE_FRACTION, num, den,
NULL);
return;
cropcap_failed:
if (errno != ENOTTY)
GST_WARNING_OBJECT (v4l2object->element,
"Failed to probe pixel aspect ratio with VIDIOC_CROPCAP: %s",
g_strerror (errno));
goto done;
if (v4l2object->keep_aspect && v4l2object->par)
gst_structure_set_value (s, "pixel-aspect-ratio", v4l2object->par);
}
/* returns TRUE if the value was changed in place, otherwise FALSE */
@ -3913,6 +3879,25 @@ gst_v4l2_object_probe_caps (GstV4l2Object * v4l2object, GstCaps * filter)
ret = gst_caps_new_empty ();
if (v4l2object->keep_aspect && !v4l2object->par) {
struct v4l2_cropcap cropcap;
memset (&cropcap, 0, sizeof (cropcap));
cropcap.type = v4l2object->type;
if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_CROPCAP, &cropcap) < 0) {
if (errno != ENOTTY)
GST_WARNING_OBJECT (v4l2object->element,
"Failed to probe pixel aspect ratio with VIDIOC_CROPCAP: %s",
g_strerror (errno));
} else {
v4l2object->par = g_new0 (GValue, 1);
g_value_init (v4l2object->par, GST_TYPE_FRACTION);
gst_value_set_fraction (v4l2object->par, cropcap.pixelaspect.numerator,
cropcap.pixelaspect.denominator);
}
}
for (walk = formats; walk; walk = walk->next) {
struct v4l2_fmtdesc *format;
GstStructure *template;