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v4l2src: handle old and odd driver behaviour when listing controls

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This commit is contained in:
Mark Nauwelaerts 2014-02-22 21:31:21 +01:00
parent 7a65277119
commit 43a9c7652b
1 changed files with 6 additions and 2 deletions
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6
sys/v4l2/v4l2_calls.c
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@ -257,6 +257,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
if (!next) if (!next)
n++; n++;
retry:
/* when we reached the last official CID, continue with private CIDs */ /* when we reached the last official CID, continue with private CIDs */
if (n == V4L2_CID_LASTP1) { if (n == V4L2_CID_LASTP1) {
GST_DEBUG_OBJECT (e, "checking private CIDs"); GST_DEBUG_OBJECT (e, "checking private CIDs");
@ -274,7 +275,7 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported."); GST_DEBUG_OBJECT (e, "V4L2_CTRL_FLAG_NEXT_CTRL not supported.");
next = 0; next = 0;
n = V4L2_CID_BASE; n = V4L2_CID_BASE;
continue; goto retry;
} }
} }
if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) { if (errno == EINVAL || errno == ENOTTY || errno == EIO || errno == ENOENT) {
@ -292,6 +293,9 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
continue; continue;
} }
} }
/* bogus driver might mess with id in unexpected ways (e.g. set to 0), so
* make sure to simply try all if V4L2_CTRL_FLAG_NEXT_CTRL not supported */
if (next)
n = control.id; n = control.id;
if (control.flags & V4L2_CTRL_FLAG_DISABLED) { if (control.flags & V4L2_CTRL_FLAG_DISABLED) {
GST_DEBUG_OBJECT (e, "skipping disabled control"); GST_DEBUG_OBJECT (e, "skipping disabled control");