hemertje

At december 20, PieterG, member of the Dutch PLi team, added a new CaPMT interface into CVS.

http://cvs.tuxbox.org/tuxbox/apps/tu...=date&view=log

To use this new CaPMT interface correctly in Enigma, it is up to the emu / softcamdevelopers that they update their work to this, because not every emu / softcam can handle this!

For now this new CaPMT interface is only available in the PLi Diamond image and in the CAMX softcam.
You can use the Diamond image to test your work with, the sources of the CaPMT can be downloaded here:

http://www.dreamvcr.com/downloads/capmtloop.tgz

Below is the readme, http://www.dreamvcr.com/downloads/cahandler.README :


Camd.socket Connectionloss and a proposal for a new CaPMT interface.
================================================== ========
In the old camd.socket implementation (called clientPMT) the emu plays
the role of server to which enigma (the client) needs to connect. This
has the disadvantage that enigma endlesly needs to poll for existance
of camd.socket. Also when enigma has sent the pmt data, and the emu is
somehow stopped and restarteed(or a different emu s started) the PMT
data is not resend. A zap is needed to send new pmt data.

Connection loss
---------------
An Connectionloss-detect mechanism is implemented to remove the need
for a zap om change/restart of emus. Enigma dectects when the connection
to the camd.socket is lost and starts retrying. As soon as an emu
sets up the camd.socket again, enigma will immediately connect and
resend the pmt data. This often allows for transparent emu changes!

However, some emus have problems with this as it seems the connection
is closed as soon as the PMT data has been send. Enigma sees this as
connection loss and retries to connect to the emu. The emu will accept
the connection thinking it will receive new PMT data (e.g. thinks a zap
has been made).
In itself this is not a big problem, but when the user has selected OSD
output on channel changes he will get repeated OSD messages which
will become quite annoying.

Note: when no emu is run, enigma still tries to connect to /tmp/camd.socket.
It will then forever retry every 5 .



The new CaPMT interface
-----------------------
A new PMT interface is developped, so called serverPMT. In this interface
the server/client role is reversed. Enigma will now be a server to which
emu's (becoming a client) can connect to receive PMT information.
This allows for faster ZTI times (zap to image). Measurement have shown
that passing PMT information from enigma to emu takes 16 to 32 millisends
in the old clientPMT interface. With the new serverPMT interface it just
takes 2 milliseconds. (Of coarse one still has to wait for the emu to setup
descrabling before you get proper view.)

This also results in immediate view when an emu is started while enigma is
already running (eliminating the need of the 'autozap' feature). This is
implemented using the CA/CI interface, which is adapted to work for emus.
Switching emus becomes practically transparent (as long as the curernt CW
interval is not ended during startuptime of the new emu).

The serverPMT interface is a nice and clean interface. Enigma will become
passive and will not agressively try to make a camd.cocket connection. As
it plays the server role, it allows for many programs to get PMT data at
the same time. This makes it possible to build a very simple daemon to
manage sticky emus per channel/provider or othere tools that can make use
of PMT data.

In the new interface enigma sets up the /tmp/.listen.camd.socket and
waits for connections to it. An emu should connect to this socket and
leave it open. As soon as enigma detects the connection to the socket
it will snet CAPMT data in the same format as in the camd.socket way.
When somehow the connection gets lost (enigma crashes for example)
the emu show periodically (every second for example) try to reconnect to
the socket.

The interface will use the list_management flag to indicate CAPMT data
for more services is send. Clients should check the ca_pmt_list_management
field in the CAPMT objects, to determine whether an object is the first
or last object in the list, an object in the middle, or perhaps an update
for an existing service. With this the emu can implement support for
recording a service while viewing another.
Furthermore the emu can check the cmd_id, to determine the function of
the receiver CAPMT.

ca_pmt_list_management values:

#define LIST_MORE 0x00 /* CA application should append a 'MORE' CAPMT object the list,
* and start receiving the next object
*/
#define LIST_FIRST 0x01 /* CA application should clear the list when a 'FIRST' CAPMT object
* is received, and start receiving the next object
*/
#define LIST_LAST 0x02 /* CA application should append a 'LAST' CAPMT object to the list,
* and start working with the list
*/
#define LIST_ONLY 0x03 /* CA application should clear the list when an 'ONLY' CAPMT object
* is received, and start working with the object
*/
#define LIST_ADD 0x04 /* CA application should append an 'ADD' CAPMT object to the current list,
* and start working with the updated list
*/
#define LIST_UPDATE 0x05 /* CA application should replace an entry in the list with an
* 'UPDATE' CAPMT object, and start working with the updated list
*/

ca_pmt_cmd_id values:
#define CMD_OK_DESCRAMBLING 0x01 /* CA application should start descrambling the service in this CAPMT object,
* as soon as the list of CAPMT objects is complete
*/
#define CMD_OK_MMI 0x02
#define CMD_QUERY 0x03
#define CMD_NOT_SELECTED 0x04 /* CA application should stop descrambling this service
* (used when the last service in a list has left, note
* that there is no CI definition to send an empty list)
*/

A client implementation can mainain two lists. On list of received CaPMT
objects, and a second list for services the emu is desrambling.
When a LIST_FIRST or LIST_ONLY is received, the first last can be discarded
and rebuild with the new CaPMT data. But when a LIST_UPDATE is recieved
the first list should be updated with the received CaPMT data. When a
LIST_ADD, LIST_LAST or LIST_UPDATE is received, the two list should be
compared so the second list can be updated and hence the descrambler(s)
can be reset. In this way black holes in recordings can be avoided.
For further details see DVB document A025, "Guideline for Implementation
and Use of the Common Interface for DVB Decoder Applications"


To allow for structured PMT distribution it is advised that any tool
allows for a command line option to select the location off the socket
it needs to connect to. Default would be the /tmp/.listen.camd.socket.
It is suggested to use the '-p' parameter for this. E.g.:

camd -p /tmp/pmt.socket

================================================== ========

To the Developers:
Can you update to this new standard?

__________________
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Satnerds Moderator

JirkaS

Tnx - yes for last 500 ,5620,7020

Jirka