SPA_MEMBER is misleading, all we're doing here is pointer+offset and a
type-casting the result. Rename to SPA_PTROFF which is more expressive (and
has the same number of characters so we don't need to re-indent).
Let codec decides when rtp packet need to be sent (terminated by MTU size in most case).
LDAC encoding loop can now be terminated by reading if frame_num is written, no 'frame_count' updating is needed.
RTP payload fragmentation can now be implemented more easily based on this.
Initial Props value are parsed from device settings, further changes are triggered by 'set_param' on a2dp node.
Codec can then use props to tweak its transcoder.
We would like to have BT device codec capability checks beyond what's
possible based on A2DP caps.
Split SBC-XQ to a separate codec, and enable it in the device-dependent
check (although currently it just uses the config option).
Implement routes on the device. This makes it possible for the
session manager to restore the device volumes.
Use validate_config to get the negotiated channels for the route
volumes.
Some codecs need the MTU as a parameter so wait until we acquire
with creating the codec context.
Make some method to enumerate the parameters from the transport
config and use that for the EnumFormat param.
