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sys/v4l2/gstv4l2src.c: Improve negotiation a bit more by picking the smallest possible resolution that is larger than...

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Original commit message from CVS:
Patch by: Sjoerd Simons <sjoerd at luon dot net>
* sys/v4l2/gstv4l2src.c: (gst_v4l2src_negotiate):
Improve negotiation a bit more by picking the smallest possible
resolution that is larger than the resolution specified in the
first caps entry of the peer caps. Fixes bug #536994.
This commit is contained in:
Sjoerd Simons 2008-06-09 08:52:04 +00:00 committed by Sebastian Dröge
parent d4e7ab0e8c
commit 0f2d27525b
2 changed files with 49 additions and 5 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2008-06-09 Sebastian Dröge <slomo@circular-chaos.org>
Patch by: Sjoerd Simons <sjoerd at luon dot net>
* sys/v4l2/gstv4l2src.c: (gst_v4l2src_negotiate):
Improve negotiation a bit more by picking the smallest possible
resolution that is larger than the resolution specified in the
first caps entry of the peer caps. Fixes bug #536994.
2008-06-09 Sebastian Dröge <slomo@circular-chaos.org>
Patch by: Bastien Nocera <hadess at hadess dot net>

45
sys/v4l2/gstv4l2src.c
View file

@ -497,13 +497,48 @@ gst_v4l2src_negotiate (GstBaseSrc * basesrc)
}
GST_DEBUG_OBJECT (basesrc, "intersect: %" GST_PTR_FORMAT, icaps);
if (icaps) {
/* If there are multiple intersections pick the one with the smallest
* resolution strictly bigger then the first peer caps */
if (gst_caps_get_size (icaps) > 1) {
GstStructure *s = gst_caps_get_structure (peercaps, 0);
int best = 0;
int twidth, theight;
int width = G_MAXINT, height = G_MAXINT;
if (gst_structure_get_int (s, "width", &twidth)
&& gst_structure_get_int (s, "height", &theight)) {
/* Walk the structure backwards to get the first entry of the
* smallest resolution bigger (or equal to) the preferred resolution)
*/
for (i = gst_caps_get_size (icaps) - 1; i >= 0; i--) {
GstStructure *is = gst_caps_get_structure (icaps, i);
int w, h;
if (gst_structure_get_int (is, "width", &w)
&& gst_structure_get_int (is, "height", &h)) {
if (w >= twidth && w <= width && h >= theight && h <= height) {
width = w;
height = h;
best = i;
}
}
}
}
caps = gst_caps_copy_nth (icaps, best);
gst_caps_unref (icaps);
} else {
caps = icaps;
}
}
gst_caps_unref (thiscaps);
gst_caps_unref (peercaps);
if (icaps) {
/* take first (and best, since they are sorted) possibility */
caps = gst_caps_copy_nth (icaps, 0);
gst_caps_unref (icaps);
}
} else {
/* no peer or peer have ANY caps, work with our own caps then */
caps = thiscaps;