SV: [Speex-dev] How to detect SpeexBits corruption

[Greg Copeland]

Ohh...nice.  I actually thought I was emailing Jean-Marc and didn't
expect anything back from the list.  In fact once I got a reply back
saying it was waiting mod approval for list submission, I though it
would be dropped.  Your reply is both unexpected and much appreciated.

I'm checking it out right now!!

Thanks,

Greg


On Sat, 2007-03-17 at 12:00 -0400, Steve Kann wrote:
> I wrote a speex parser, which we use inside of asterisk and iaxclient.  
> It can parse a stream of speex data into individual packets:
> 
> See static int speex_get_samples(unsigned char *data, int len) (and it's 
> 2 helper functions) in 
> http://iaxclient.svn.sourceforge.net/viewvc/iaxclient/trunk/iaxclient/lib/libiax2/src/iax.c
> 
> As it's written, it just looks at a bunch of speex data, and tells you 
> how many actual samples are contained within, but the code can be 
> changed to do more generic parsing.
> 
> -SteveK
> 
> 
> Greg Copeland wrote:
> > I was curious if you had ever peeked at a Teamspeak voice packet?  I
> > already have large chunks of the protocol torn apart.  I believe the
> > voice packets are the last big hurdle.  As I know nothing about speex
> > encoding, it is proving difficult to figure out the start of the actual
> > voice data and/or any voice specific state data contained within the
> > packet.  If you have any information and are willing to share, I'd
> > certainly love to see it.  I'm oh so close to having a bare bones TS
> > client on Linux which actually uses ALSA.
> >
> > On my hardware, the ALSA-OSS emulation provides for horrid mic input
> > (even using the native TS client) but the native ALSA stuff sounds
> > pretty well.  At any rate, any detail you can provide would be
> > appreciated!!!
> >
> > If you're curious, I'm currently prototyping this in python using
> > audioop, wave, pyaudio and pySpeex.  Once I have something that works,
> > I'll probably turn around and make a WxWidgets client (C++) which uses
> > ALSA...but I'd also like to quickly tie a T-T-S app to a TS server via
> > the python implementation, quickly, if I can.
> >
> > As an aside, I started this project to filter various TS packets to
> > prevent hackers from abusing the server.  To do that, I had to determine
> > good packets from bad packets.  Thus far my efforts have stopped all
> > hacking (to date) on my brother's TS server.  So naturally, I thought it
> > would be fun to tie a T-T-S mechanism to the server to stop the "who
> > joined" questions...so on and so on...  And here we are.  ;)
> >
> > --
> > Greg 
> >
> > _______________________________________________
> > Speex-dev mailing list
> > Speex-dev at xiph.org
> > http://lists.xiph.org/mailman/listinfo/speex-dev
> >
> >   
> 
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