On Dec 16, 2007, at 5:48 PM, Russell Bryant wrote:
> Greetings,
>
> I have been working on Jack support in Asterisk this weekend and I
> have it
> working, as far as I can tell. I have a Jack Asterisk dialplan
> application
> which when executed, creates two jack ports; one port is input and
> the other is
> output. These ports let you access the audio that comes from the
> caller, as
> well as control what audio gets sent back to the caller. Once I
> have this
> working well, I will extend the Jack interface to allow you to do
> fancier
> things. Right now, the jack interface is the endpoint of the phone
> call, but it
> would be even more interesting to be able to hook into the audio
> path of a phone
> call to another destination.
>
> Anyway, the way that I have tested this is simply by using an
> application called
> "Patchage". It is a graphical jack port manager. When I make a
> call, I see my
> two jack ports appear. I can connect them together and everything
> I say gets
> sent back to me as expected.
>
> My next step is that I want to figure out how to hook up my ports
> to a Pd patch,
> but I haven't quite figured out how to use Jack in Pd yet. I'm
> going to keep
> working on it, but I figured I would post what I have in case
> anyone else was
> curious and interested in trying it out.
>
> Here is what I'm doing to test what I have ...
>
>
> 1) Install my branch of Asterisk that contains app_jack.
>
> $ svn co http://svn.digium.com/svn/asterisk/team/russell/jack
> asterisk-jack
> $ cd asterisk-jack
> $ ./configure && make
> $ sudo make install
>
> The jack interface is in apps/app_jack.c in case anyone cares.
When building on Mac OS X/Intel 10.4.11, I got this:
[CC] app_jack.c -> app_jack.o
app_jack.c:42:20: error: values.h: No such file or directory
app_jack.c: In function 'handle_input':
app_jack.c:217: error: 'FLT_MAX' undeclared (first use in this function)
app_jack.c:217: error: (Each undeclared identifier is reported only once
app_jack.c:217: error: for each function it appears in.)
app_jack.c: In function 'queue_voice_frame':
app_jack.c:407: error: 'FLT_MAX' undeclared (first use in this function)
make[1]: *** [app_jack.o] Error 1
make: *** [apps] Error 2
This made it build OK:
Index: apps/app_jack.c
===================================================================
--- apps/app_jack.c (revision 94662)
+++ apps/app_jack.c (working copy)
@@ -39,7 +39,11 @@
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+#ifdef __APPLE__
+#include <float.h>
+#else
#include <values.h>
+#endif
#include <jack/jack.h>
#include <jack/ringbuffer.h>
Now it's time to make it run!
.hc
>
>
> 2) Make an entry in /etc/asterisk/extensions.conf that looks like
>
> exten => 500,1,Answer()
> exten => 500,n,Jack()
>
>
> 3) Make sure jackd is running. For the sake of efficiency, specify
> 8 kHz,
> because for most codecs used for phone calls, that's all you get.
> Also, specify
> 160 frames per period. For 8 kHz audio, this comes out to 20 ms
> periods, which
> is generally the packet size used for Voice over IP.
>
> $ sudo jackd -d dummy -r 8000 -p 160
>
>
> 4) Make a call to the extension created in Asterisk in step 2. You
> should see
> the two new jack ports become available. In theory, they are
> available for
> connection to any application that can use Jack. The only thing I
> have done so
> far is to use the "patchage" application to connect the ports
> directly together
> to verify that the audio is flowing correctly.
>
>
> Now, to figure out how to hook up arbitrary jack ports to Pd ... if
> anyone has
> any pointers, it would be much appreciated. I'm still very new to
> Pd. :)
>
> --
> Russell Bryant
>
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