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

[Steve Kann]

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 
>
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