glasscoder(1) man page.

  .PP A running glasscoder(1) instance can be monitored and controlled by means of two different
  .SH "MONITORING VIA STANDARD OUTPUT"

  .PP glasscoder(1) can output realtime information about current operating state via its
generated is controlled by means of the --errors-to and --meter-data options.

  .PP When --errors-to=STDOUT is specified, glasscoder(1) will output error messages on standard
  .PP
                 ER  [priority]  [msg]

         .PP where [priority] is an integer the indicates the priority level of the error as
       defined by the syslog(3) interface and [msg] is a text string describing the error. Each
       message is terminated by a newline character.

         .PP When --meter-data is specified, glasscoder(1) will output realtime audio level
       information suitable for being rendered as an audio meter display in the following format:

         .PP
                 ME  [left-lvlright-lvl]

         .PP where each argument is the current audio level of the corresponding channel in
       hexidecimal, referenced to 0 dBFS. Each message is terminated by a newline character.

         .SH "CONTROL VIA STANDARD INPUT"

         .PP glasscoder(1) supports the following command, sent via standard input:

         .PP
                 MD  [text]

         .PP Send the metadata [text] to the stream. The command should be terminated by newline.

         .SH "CONTROL VIA HTTP"

         .PP If the --metadata-port=port option is given a non-zero value, metadata updates can
       be sent to the stream by means of HTTP calls. For details, see the METADATA section of the
       glasscoder(1) man page.

         .SH "PROXY CONNECTIONS"

         .PP It is possible to implement proxy connectors for glasscoder(1)'s IceStreamer server
       through use of the --server-pipe command switch. This switch will create a UNIX socket
       which can be used to pipe in open descriptors for player connections by means of
       ancilliary socket messages with the SCM_RIGHTS message type. See the unix(7) man page for
       more information. A fully worked-out example is also available in the GlassCoder source
       package in the 'src/tests/' subdirectory.

         .SH "AUTHOR"

         .PP Fred Gleason <fredg@paravelsystems.com>

         .SH "SEE ALSO"

         .PP glasscoder(1), cmsg(3), sendmsg(2), syslog(3), unix(7)

AUTHOR

       Fred Gleason <fredg@paravelsystems.com>
           Application Author