This new function allows you to create a circuit on an existing input handle.
We don't create the circuit anymore from the first packet seen, instead the
client application is in full control of opening and closing the circuit.
This change includes a new feature to pad a circuit until we see the first
packet that contains voice data. This is useful to preallocate bandwidth on
satellite links such as Iridium/OpenPort.
Add this new function to explicitly remove an existing circuit. Thus, the
client application (openbsc) is in full control to release circuits.
Before this patch, the circuit object was added when the first RTP messages was
seen, and it was removed when transforming the list of pending RTP messages to
the Osmux message (once the timer expired).
Moreover, check circuit->nmsgs to account bytes that are consumed by the osmux
header, given that !circuit doesn't mean "this is the first packet" anymore.
Use the new macros to deal with little/big endian. Im a bit
worried to make this change due the little test coverage in
this module but in case of a typo the elements would not be
defined.
This patch adds a new field to the struct osmux_in_handle that allows
you to specify the osmux frame size. If not specified, the default
size assumes your nic uses a mtu of 1500 bytes.
Remove these functions:
- osmux_xfrm_input_get_ccid
- osmux_xfrm_input_register_ccid
The ccid will be managed by the BSC and it will be stored in the
mgcp_endpoint structure.
Also adjust all tests and examples using the API.
This patch cleans up the transmission path for osmux, this involves
the functions that extract the messages from the batch and the one
that reconstruct the timing.
They now take a list that contains the reconstructed RTP messages:
osmux_xfrm_output(osmuxh, &h_output, &list);
osmux_tx_sched(&list, &tv, tx_cb, NULL);
This patch adds the counter field to the osmux header, so we can
reduce the size of the batch even further, eg.
osmuxhdr (ctr=3)
speech
speech
speech
osmuxhdr (ctr=2)
speech
speech
...
The new header is the following:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| FT | CTR |F|Q| SeqNR | Circuit ID |AMR-FT |AMR-CMR|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The counter field is 3 bits long, thus, we can batch up to 8
RTP speech frames into one single batch per circuit ID.
I have also removed the RTP marker, since it can be reconstructed
from the AMR information.
Moreover, the entire workflow has been also reworked. Whenever a
packet arrives, we introduce it into the batch list. This batch
list contains a list of RTP messages ordered by RTP SSRC. Then,
once the batch timer expires or the it gets full, we build the
batch from the list of RTP messages.
Note that this allows us to put several speech frame into one
single osmux header without actually worrying about the amount
of messages that we'll receive.
The functions that reconstruct the RTP messages has been also
adjusted. Now, it returns a list of RTP messages per RTP SSRC
that has been extracted from the batch.
This function schedules the transmission of a RTP message that was
obtained from one osmux batch. It takes the time (in microseconds)
after which the message should be transmitted.