Finds the features in @caps that has the index @index, and
returns it.
WARNING: This function takes a const GstCaps *, but returns a
non-const GstCapsFeatures *. This is for programming convenience --
the caller should be aware that structures inside a constant
#GstCaps should not be modified. However, if you know the caps
are writable, either because you have just copied them or made
them writable with gst_caps_make_writable(), you may modify the
features returned in the usual way, e.g. with functions like
gst_caps_features_add().
You do not need to free or unref the structure returned, it
belongs to the #GstCaps.
Finds the features in @caps that has the index @index, and returns it.
WARNING: This function takes a const GstCaps *, but returns a non-const GstCapsFeatures *. This is for programming convenience -- the caller should be aware that structures inside a constant #GstCaps should not be modified. However, if you know the caps are writable, either because you have just copied them or made them writable with gst_caps_make_writable(), you may modify the features returned in the usual way, e.g. with functions like gst_caps_features_add().
You do not need to free or unref the structure returned, it belongs to the #GstCaps.