[Asterisk-Dev] ztplay. How do I talk directly to zap channels?

[Ben Miller]

I apologize if this is the wrong forum, but I am having trouble finding
information on programming to the zaptel interface directly.

I have a need to provide Music on Hold to another phone system that is
not nearly as flexible as *.  The other system will apparently  take MOH
from its FXO ports.  What I would like to do is use my * box to provide
MOH for them.  But I do not want to permanently tie up my Asterisk
process in doing so. 

 

What I would like to do is use mpg123 to play music directly onto a zap
channel.  This would provide a very high density flexible way to provide
MOH and leave my * process out of the mix.

 

I have taken a look at ztmonitor in hopes to understand how I would be
able to reverse the process and read from STDIN and write to a zap
channel.  I am calling this new app ztplay.  I do not fully understand
the relationship between pseudo channels and real channels, nor where
timing is derived.  So please forgive the assumptions related to what I
have done.  

 

I have followed the ztmonitor example and opened a pseudo channel.  I
have created a ZT_CONF in  ZT_CONT_CONF mode with channel 2 of my zaptel
span.   Then, like ztmonitor, I simply loop, copying data from stdin
(instead of a sound card) to the pseudo channel (see code snippet
below).  This however does not seem to be working.  Can someone please
point me in the right direction of how I should be doing this?  Is there
some sample code I could follow?  Thanks in advance,

Ben

 

 

 

       /* Open Pseudo device */

        if ((pfd = pseudo_open()) < 0)

                exit(1);

        /* Conference them */

        memset(&zc, 0, sizeof(zc));

        zc.chan = 0;

        zc.confno = atoi(argv[1]);

 

        zc.confmode = ZT_CONF_CONF;

 

        if (ioctl(pfd, ZT_SETCONF, &zc) < 0) {

          fprintf(stderr, "Unable to conference: %s\n",
strerror(errno));

          exit(1);

        }

        memset(&zc, 0, sizeof(zc));

 

        /* Now, copy from stdin to pseudo */

        for (;;) {

          memset(buf,0,sizeof(buf));

          res = read(0,buf,sizeof(buf));

          if (res < 0) {

            printf("Res: %d\n",res);

            break;

          }

          if (pfd)

             write(pfd, buf, res);

        }

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