Gets the capabilities of the allowed media types that can flow through
pad and its peer.
The allowed capabilities is calculated as the intersection of the results of
calling Pad.queryCaps on pad and its peer. The caller owns a reference
on the resulting caps.
Gets the capabilities of the allowed media types that can flow through pad and its peer.
The allowed capabilities is calculated as the intersection of the results of calling Pad.queryCaps on pad and its peer. The caller owns a reference on the resulting caps.