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overrides: add a set_caps() method to the Pad override

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The C API provides the gst_pad_set_caps() helper which makes it easier
to set caps on pads (see gst/gstcompat.h in gstreamer core).

Add such handy helper to the python bindings too.

The implementation follows as close as possible the one in gstcompat.h
with two changes:
  1. the type check on the pad has been removed because self is
     guaranteed to be a Gst.Pad in python.
  2. the null check on the caps has been extended to be a type check.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-python/issues/19
This commit is contained in:
Antonio Ospite 2019-01-09 11:39:19 +01:00
parent a37b7c7a13
commit 1cece5bde5
1 changed files with 16 additions and 0 deletions
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16
gi/overrides/Gst.py
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@ -156,6 +156,22 @@ class Pad(Gst.Pad):
def query_caps(self, filter=None):
return Gst.Pad.query_caps(self, filter)
def set_caps(self, caps):
if not isinstance(caps, Gst.Caps):
raise TypeError("%s is not a Gst.Caps." % (type(caps)))
if not caps.is_fixed():
return False
event = Gst.Event.new_caps(caps)
if self.direction == Gst.PadDirection.SRC:
res = self.push_event(event)
else:
res = self.send_event(event)
return res
def link(self, pad):
ret = Gst.Pad.link(self, pad)
if ret != Gst.PadLinkReturn.OK: