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v4l2src: avoid lists with one single framerate in probed caps

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Simplify framerate field if possible, so we don't end up with
e.g. framerate = (fraction) { 30/1 }. Maybe the helper function
should be moved to core, but we can do this later.
This commit is contained in:
Tim-Philipp Müller 2014-05-12 17:20:14 +01:00
parent 420661bd95
commit f63bdd0483
1 changed files with 20 additions and 0 deletions
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20
sys/v4l2/gstv4l2object.c
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@ -1557,6 +1557,25 @@ cropcap_failed:
goto done;
}
/* returns TRUE if the value was changed in place, otherwise FALSE */
static gboolean
gst_v4l2src_value_simplify (GValue * val)
{
/* simplify list of one value to one value */
if (GST_VALUE_HOLDS_LIST (val) && gst_value_list_get_size (val) == 1) {
const GValue *list_val;
GValue new_val = G_VALUE_INIT;
list_val = gst_value_list_get_value (val, 0);
g_value_init (&new_val, G_VALUE_TYPE (list_val));
g_value_copy (list_val, &new_val);
g_value_unset (val);
*val = new_val;
return TRUE;
}
return FALSE;
}
/* The frame interval enumeration code first appeared in Linux 2.6.19. */
static GstStructure *
@ -1745,6 +1764,7 @@ return_data:
(interlaced ? "mixed" : "progressive"), NULL);
if (G_IS_VALUE (&rates)) {
gst_v4l2src_value_simplify (&rates);
/* only change the framerate on the template when we have a valid probed new
* value */
gst_structure_set_value (s, "framerate", &rates);