[Icecast-dev] understanding icecast decoding from a listener client perspective

Andy Martin zippo227 at gmail.com
Fri Oct 4 11:27:36 PDT 2013

I looked at these requests and started trying to interpret the data of 
the header and the stream. I receive a header, and even when I added the 
parameter to the request to try and get meta-data, it seems that it is 
not being included. Namely, the number that is supposed to tell the 
distance between each meta-data section that is sent in the stream. I 
couldn't figure out the config setting for relaying meta-data with my 
icecast stream.

When I look at the stream, I also noticed that it says Oggs twice. Which 
one of these starts the stream? So what information is really important 
from the header, and is any of that actually important for decoding? How 
Can I find the first part of the stream that needs to be passed to 
Libogg, and does libogg or (libvorbis) have a feature that will callback 
when it reads meta data.

Andy S. Martin

www.guitarrpg.com  <http://www.guitarrpg.com>
M.S. Computer Science Game Development
University of Southern California '2013 Alumni

On 10/3/13 5:04 PM, Brad Isbell wrote:
> The headers you get back are just an HTTP response.  When you get to 
> the actual data part of the message (where you see Oggs) that's the 
> data you send off to libogg to decode.
> You will need to remove metadata from the response periodically.  See 
> my posts here for more info:
> http://stackoverflow.com/a/6072488/362536
> http://stackoverflow.com/a/4914538/362536
> 	*Brad Isbell // AudioPump*
> brad at audiopump.co <mailto:brad at audiopump.co>
> Skype: bradisbell
> Phone: +1 312-488-4680
> On Thu, Oct 3, 2013 at 5:44 PM, Andy Martin <zippo227 at gmail.com 
> <mailto:zippo227 at gmail.com>> wrote:
>     I want to write an icecast listener client using C# and C++. I can
>     asynchronously connect read the continuous bytes from the stream
>     using some basic C# code. When I look at the bytes (interpreted as
>     ASCII) I don't understand what it is that I need to be using
>     before passing the Ogg to libogg. I see some artist information,
>     and I know that there is an ICY200OK type of message. I also see
>     the word Oggs at the beginning. But, what do I really need to do
>     to decode the stream and the header? What parts of the header are
>     actually necessary for libogg to start pulling the packets?
>     Ideally, my client would connect to the stream and read the header
>     as well as detect track information that is included in the
>     icecast periodically.
>     The documentation that I've been reading for Icecast only explains
>     the server and source client side. I've been working with icecast
>     for a little over a year now, and I have had to resort to
>     commercial products for decoding and playing a stream. I want to
>     include this capability in my project without having to ask people
>     to use Winamp or some other player. I  want to find the
>     documentation on how to read the stream; how to interpret the
>     periodic meta-data; how to pack these bytes into something usable
>     for libogg. I'm very new to this concept of pages and packets.
>     Thank you in advance for reading this request.
>     -- 
>     Best,
>     Andy S. Martin
>     www.guitarrpg.com  <http://www.guitarrpg.com>
>     M.S. Computer Science Game Development
>     University of Southern California '2013 Alumni
>     _______________________________________________
>     Icecast-dev mailing list
>     Icecast-dev at xiph.org <mailto:Icecast-dev at xiph.org>
>     http://lists.xiph.org/mailman/listinfo/icecast-dev

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