Icecast dev - Jul 2007 - Writing Alpha Tags into the comments of an ogg stream

What do I need to do to incorporate alpha tags into the ogg stream of
ices?

Alpha Tags are name/frequency tags for a scanner -- I have the alpha
tags easily outputted to stdout, but how do I assign each to the comment
field of the ogg stream?

Just guessing, I'll need to bring in the vorbis/ogg headers/libs and use
the lib to write the alpha tag info to the ogg stream.  But one question
remains, where is the stream I need to write the comments too?  Or,
should i just write the comments to localhost:8000/mystream.ogg ?

Screenshot of what I've got dsctl doing now:
http://sourceforge.net/projects/dsctl/
https://sourceforge.net/project/screenshots.php?group_id=198579
(bottom line -- reception status -- is an example of what I'll be
incorporating into the comment fields of the ogg stream.)

--
Roger
http://www.eskimo.com/~roger/index.html
Key fingerprint = 8977 A252 2623 F567 70CD 1261 640F C963 1005 1D61

Sun Jul 15 22:39:02 PDT 2007

Hi,

Ideally you'd do it with the program which is encoding our stream.  You just
start a new ogg stream when you want to change your metadata and use the 
appropriate tags.

If this is not possible, you can also do this via Icecast.  It will insert 
the tags for you, creating the new stream.

Here's what I've managed to turn up quickly as the appropriate syntax. 
This
really ought to be documented somewhere, but if you can't find anything 
either, you may find some source code useful.

http://lists.xiph.org/pipermail/icecast/2005-March/008962.html

Hope this helps,
Geoff.

> Ideally you'd do it with the program which is encoding our stream.  You
just
> start a new ogg stream when you want to change your metadata and use the 
> appropriate tags.
> 
> If this is not possible, you can also do this via Icecast.  It will insert 
> the tags for you, creating the new stream.
> 
> Here's what I've managed to turn up quickly as the appropriate
syntax.  This
> really ought to be documented somewhere, but if you can't find anything
> either, you may find some source code useful.
> 
> http://lists.xiph.org/pipermail/icecast/2005-March/008962.html

Figured it out.  Using Ices, I can either write to stdin or a file.  


Using a file method:

$ cat metadata 
artist=Eugene Oregon
title=Scanning

$ ps -ax |grep ices

$ kill -SIGUSR1 [pid of ices]



Writing to stdin method:

Partial answer is to use Icecast webserver:
http://localhost:8000/admin/updatemetadata.xsl?mount=/stream.ogg

(One issue I have to remember, I have have permission to write to where
ever I'm going to write/put the metadata or having to login with
user/pass.)

I would imagine using stdin, and as long as I'm on the host, I should be
able to do something like:
$cat metadata >
http://localhost:8000/admin/updatemetadata.xsl?mount=/stream.ogg



Probably the best solution for now:

My thoughts are to write a ~/.dsctl/metadata and have the *dsctl program
output metadata there and the user specify the location of the metadata
file.  If I can do this without much interruption of streaming with
using the kill SIGUSR1, metatags will probably have a change interval of
around 1 second.  (right?)

(*Dsctl is a program used to monitor this device's alpha tags because
only analog audio is being piped into the line-in of the sound card.)

--
Roger
http://www.eskimo.com/~roger/index.html
Key fingerprint = 8977 A252 2623 F567 70CD 1261 640F C963 1005 1D61

Mon Jul 16 11:35:13 PDT 2007