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v4l2object: Don't probe UVC devices for being interlaced

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UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them
causes expensive and slow USB IO, so don't probe them for interlaced.

This shaves 2 seconds of the startup time of cheese with a Logitech
Webcam Pro 9000.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=677722
This commit is contained in:
Hans de Goede 2012-06-08 20:38:34 +02:00 committed by Wim Taymans
parent 98e415dc9d
commit b9676944bb
1 changed files with 12 additions and 4 deletions
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10
sys/v4l2/gstv4l2object.c
View file

@ -1589,10 +1589,18 @@ gst_v4l2_object_probe_caps_for_format_and_size (GstV4l2Object * v4l2object,
gint int_width = width;
gint int_height = height;
/* interlaced detection using VIDIOC_TRY/S_FMT */
if (!strcmp((char *)v4l2object->vcap.driver, "uvcvideo")) {
/*
* UVC devices are never interlaced, and doing VIDIOC_TRY_FMT on them
* causes expensive and slow USB IO, so don't probe them for interlaced
*/
interlaced = FALSE;
} else {
/* Interlaced detection using VIDIOC_TRY/S_FMT */
if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat,
&int_width, &int_height, &interlaced))
return NULL;
}
memset (&ival, 0, sizeof (struct v4l2_frmivalenum));
ival.index = 0;