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v4l2object: drop workaround for misbehaving TRY_FMT

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This workaround from 2011 was causing 25 S_FMT ioctls to be sent
to my UVC webcam from under gst_v4l2_object_get_caps as it probes
all the formats. In total, this adds up to about 5 seconds of
execution time, or a 10 second delay while starting up cheese.

These ioctls come from a workaround from 2011 where TRY_FMT might
make changes to hardware settings, so S_FMT was used to restore
the original config:
https://bugzilla.gnome.org/show_bug.cgi?id=649067

The driver bug is now assumed fixed. Remove the workaround to fix the
long startup delay.

https://bugzilla.gnome.org/show_bug.cgi?id=732326
This commit is contained in:
Daniel Drake 2014-06-27 11:33:06 +01:00 committed by Nicolas Dufresne
parent bbb1a8de1f
commit f9eb4dd206
1 changed files with 1 additions and 17 deletions
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18
sys/v4l2/gstv4l2object.c
View file

@ -2129,10 +2129,9 @@ static gboolean
gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
guint32 pixelformat, gint * width, gint * height, gboolean * interlaced)
{
struct v4l2_format fmt, prevfmt;
struct v4l2_format fmt;
int fd;
int r;
int prevfmt_valid = FALSE;
gboolean ret = FALSE;
g_return_val_if_fail (width != NULL, FALSE);
@ -2145,15 +2144,6 @@ gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
fd = v4l2object->video_fd;
memset (&fmt, 0, sizeof (struct v4l2_format));
memset (&prevfmt, 0, sizeof (struct v4l2_format));
/* Some drivers are buggy and will modify the currently set format
when processing VIDIOC_TRY_FMT, so we remember what is set at the
minute, and will reset it when done. */
if (!v4l2object->no_initial_format) {
prevfmt.type = v4l2object->type;
prevfmt_valid = (v4l2_ioctl (fd, VIDIOC_G_FMT, &prevfmt) >= 0);
}
/* get size delimiters */
memset (&fmt, 0, sizeof (fmt));
@ -2234,12 +2224,6 @@ error:
GST_WARNING_OBJECT (v4l2object->element,
"Unable to try format: %s", g_strerror (errno));
}
if (prevfmt_valid)
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &prevfmt) < 0) {
GST_WARNING_OBJECT (v4l2object->element,
"Unable to restore format after trying format: %s",
g_strerror (errno));
}
return ret;
}