[Speex-dev] Speex and RTP

[David Hogan]

Hi Jean-Marc,

Just some initial feedback, I've just tried to build svn head using the
Visual Studio 2005 compiler, and had the following issues:

1. Missing definition of M_PI if it's undefined (and it is on this
platform)
2. In speex_resampler_process_int, the compliler can't determine the
value of *in_len and *out_len at compile time and thus determine the
size of the x and y arrays.

I've resolved these issues locally with quick and obvious hacks and when
I get a chance I'll integrate your resampler into some code of ours and
see how it goes. We're currently using a combination of my own
resampling code (for simple cases) and the Windows ACM Library (which
yields poor results, no filtering as far as I can tell) so your
development of this functionality is quite timely for us (thanks :) ).

Cheers,
Dave


> -----Original Message-----
> From: Jean-Marc Valin [mailto:jean-marc.valin at usherbrooke.ca] 
> Sent: Monday, 5 February 2007 9:27 PM
> To: David Hogan
> Cc: Randy Schefiele; speex-dev at xiph.org
> Subject: Re: [Speex-dev] Speex and RTP
> 
> > I believe there is new resampling functionality in the 
> speex svn head,
> > although I haven't tested it yet. You might also want to check out
> > 'Secret Rabbit Code' for your resampling.
> 
> Yes, I've just been working on a resampler recently. Its 
> changing a lot,
> but it's now usable. I'd actually be quite happy to have some feedback
> on it.
> 
> 	Jean-Marc
> 
> 
> > Hope this helps.
> > Dave
> > 
> > 
> > ________________________________
> > 
> > 	From: speex-dev-bounces at xiph.org
> > [mailto:speex-dev-bounces at xiph.org] On Behalf Of Randy Schefiele
> > 	Sent: Saturday, 3 February 2007 7:12 AM
> > 	To: speex-dev at xiph.org
> > 	Subject: [Speex-dev] Speex and RTP
> > 	
> > 	
> > 	Hi -
> > 	
> > 	I am currently developing a RTSP/RTP/SDP solution to stream
> > Speex encoded data.  Using my current source, I have successfully
> > streamed u-law and PCM encoded audio but have been 
> unsuccessful thus far
> > with Speex.
> > 	
> > 	Because of some constraints of my system, I am encoding audio at
> > 11.025kHz.  I am still using the 160 samples per frame 
> which makes my
> > frame size 28 bytes.  I have successfully written the SDP needed to
> > describe the Speex stream but I haven't found a player that 
> will play
> > the stream.  I could be doing something wrong, but does 
> anyone know of
> > any players that can play RTP Speex streams so I can be sure that my
> > solution is incorrect?
> > 	
> > 	Also, I have looked over the draft RFC of the Speex RTP payload
> > and I was curious to know if, because I am not using a 
> standard sample
> > rate, my solution will work.  In the draft RFC (and the 
> Speex manual for
> > that matter) it always refers to Speex frames containing 
> 20ms of audio.
> > In my case, a Speex frame actually contains roughly 14.5 seconds of
> > audio.  Am I going to need to hack the Speex encoder to 
> make my frames
> > be 20ms in order for the RTP to successfully play?
> > 	
> > 	Any advice/help anyone can give would be greatly appreciated.
> > 	
> > 	Thanks!
> > 	Randy
> > 	
> > 
> > 	
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