Tries to find what type of data is flowing from the given source #GstPad.
Free-function: gst_caps_unref
A source #GstPad
The length in bytes
the #GstCaps corresponding to the data stream. Returns %NULL if no #GstCaps matches the data stream.
See Implementation
Tries to find what type of data is flowing from the given source #GstPad.
Free-function: gst_caps_unref