[speex-dev] Speex latency

[Simon Morlat]

Hi,

Speex's latency at 8khz is 20 ms. Which is under the latency of most
cards.
If you are using alsa-driver with oss-emulation in your program, you
have to use the SNDCTL_DSP_SUBDIVIDE to divide the size of capture and
playback buffers. The common size (supported by all alsa drivers) at
8000 Hz is 512 bytes (32ms). 

Simon

Le ven 21/03/2003 à 15:22, Rolando Martins a écrit :
> Hi,
> What kind of latency is expected using 8,16,32 khz?
> I am trying to do a realtime stream server, and I am having latency above
> >500ms ( I capture the sound using the mic, encode it and send it to the
> client).
> I am using ALSA system, a SB128 PCI and a 800Mhz P3 . What can I do to lower
> the latency?
> 
> I tried a test : arecord -t raw | speexenc - - | speexdec - and I found that
> I also have a 500 ms latency.
> 
> 
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-- 
Simon Morlat <simon.morlat at linphone.org>

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