Overriding the pad query function completely overrides all the default
query handling implemented in basesrc, including caps etc. The correct
thing to do is just override the basesrc query vfunc and then chain up
for the queries we don't handle.
All goto fail happen before ret is set. ret must be NULL, and the only
thing the fail statement block does is return NULL. Replacing the jumps to
do this return directly.
CID #1311329
Source element that connects to a given transport and reads audio over
AVDTP. Does not provide a clock but uses the system clock to timestamp
incoming packets. Only SBC is currently supported.