some not so small changes to JACK support

[Kai Vehmanen]

Hi,

I now committed a set of patches that changes the options used to
communicate with JACK. I also decided to commit Dominic's patch
to 'jack_generic' (and now applies to 'jack' as well) -- it's the
right thing to do and it actually fixes a bug, so better to apply it.

Here's a log of the commits plus clips from the update man page.
Comments are welcome.

--cut--
commit 3d783dc252b6dbd83ffd80639e98deae2fc9e341
Author: Kai Vehmanen <kvehmanen -at- eca -dot- cx>
Date:   Sat Sep 20 01:41:44 2008 +0300

     Added new parameters to 'jack' object

     - added: new optional params to 'jack' -> 'jack,clientname,portprefix';
              replaces old interfaces 'jack_auto', 'jack_generic'
              and 'jack_alsa'; see ecasound(1) for more details
     - changed: deprecated 'jack_auto', 'jack_generic' and
                'jack_alsa'

commit 6e1edef45bfde3fa3940aba2817d727213906b57
Author: Dominic Sacr<E9> <dominic.sacre@...>
Date:   Fri Sep 19 23:44:48 2008 +0300

     Make jack_generic port numbers start at one for each prefix

     This also fixes a segfault that occured when using the same
     prefix for inputs and outputs (ecasound -i jack_generic,foo -o
     jack_generic,foo), because JACK doesn't allow two ports with the same name,
     even if one is input and the other is output.
--cut--

ecasound(1):
--cut--
        JACK input/outputs
               JACK is a low-latency audio server that can be used to connect multiple independent  audio  application
               to  each  other.  It is different from other audio server efforts in that it has been designed from the
               ground up to be suitable for low-latency professional audio work.

               Ecasound provides multiple ways to communicate with JACK servers.  To create a  JACK  input  or  output
               object,  one  should  use -i jack and -o jack. These create JACK client ports "ecasound:in_N" and "eca-
               sound:out_n" respectively ('N' is replaced by the channel number).  Ecasound automatically creates  one
               JACK port for each channel (number of channels is set with -f:bits,channels,rate option).

               It  is  important  to  note  that  by  default JACK ports are not connected anywhere (e.g. to soundcard
               input/outputs, or to other apps). One thus has to connect the ports  with  an  external  program  (e.g.
               "QJackCtl" or "jack_connect").

               For  simple  use scanerios, ecasound provides a way to autoconnect the ecasound ports. This can be done
               with by giving the peer client name as the second parameter to the "jack" object, e.g. -o  jack,client-
               name.   As  an example, -o jack,system will create an output that is automatically connected to outputs
               of the default system soundcard.  The client parameter can be omitted,
       in which case no automatic  connections are made.

               If  one  needs  to change the port prefix (e.g. "in" in client name "ecasound:in_N"), the prefix can be
               specified as the third parameter to "jack" object, e.g. -o jack,,fxout. Also the third parameter can be
               omitted, in which case the default prefixes "in" and "out" are used.

               Additionally   global   JACK  options  can  be  set  using  -G:jack,client_name,operation_mode  option.
               'client_name' is the name used when registering ecasound to the JACK system.   If  'operation_mode'  is
               "notransport",   ecasound will ignore any transport state changes in the JACK-system; in mode "send" it
               will send all start, stop and position-change events to other JACK clients;  in  mode  "recv"  ecasound
               will  follow  JACK start, stop and position-change events; and mode "sendrecv" (the default) which is a
               combination of the two previous modes.

               More details about ecasound's JACK support can be found from Ecasound User's Guide.

               Depracated interfaces Ecasound 2.5 and older supported "jack_alsa" and "jack_generic" object types, but
               these  are  now replaced by a more generic "jack" interface, and thus are now deprecated (they work but
               are no longer documented).
--cut--

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