[pulseaudio-discuss] Listening to the RTP stream

[Jan-Benedict Glaw]

On Mon, 2007-09-03 19:11:47 +0200, Lennart Poettering <lennart at poettering.net> wrote:
> On Mon, 03.09.07 13:49, Jan-Benedict Glaw (jbglaw at lug-owl.de) wrote:
> > 
> > I played with the RTP sending module a bit. Seems to work, at least
> > there's a RTP stream coming out of the box :)
> > 
> > However, are there alternative ways to listen to this/these streams
> > except using the receiver module? Eg. in theory, mplayer should be
> > able to listen to this stream, but it seems to have problems
> > recognizing the contents. How do I actually tell it to use a specific
> > PCM format?
> 
> Hmm. Good question. This used to work out of the box. We use the
> standard type descriptors for S16BE uncompressed audio. Nothing
> special, very basic stuff. 
> 
> According to the output you pasted mplayer ignores the RTP data type
> codes now and instead tries to recognize the data time with
> "magic". Which is a bad idea I would say. It should simply trust the
> type descriptor we use in those packets.

Had a spare second and fought myself through the mplayer sources. This
somewhat works:

$ mplayer -demuxer rawaudio -rawaudio channels=2:rate=44100:samplesize=2:format=0x10001 rtp://224.0.0.56:46520

The "interesting" part is to find out the correct values for the
`format' parameter.  This very value is from libavcodec/avcodec.h .

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw at lug-owl.de              +49-172-7608481
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