Re: [ecasound] picking up stattic with -b:64

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Subject: Re: [ecasound] picking up stattic with -b:64
From: Kai Vehmanen (kaiv@wakkanet.fi)
Date: Tue Jan 25 2000 - 17:57:04 EET

On Mon, 24 Jan 2000, Jeremy Hall wrote:

>>> ecasound -i /dev/dsp -o stdout -z:db -b:64 | msend 239.1.1.1/24430/7
>> trouble if you go under -b:128. In this case, I suspect msend is not
>> able to pipe data fast enough (meaning latency, not transfer rate).
> it does a read() on 1024 bytes, then does a write() of the same data. It
> is a very simple program, and has no disk access. It then multicasts this

It can still cause problems. Soundcard i/o consumes some of the
available time, so in practice msend has even less than 1.45ms (-b:64)
to do its stuff. And as far as I know, network cards (and TCP/IP stack
implementations) suffer from latency problems. But I'm no network-h/w
expert, so you probably know more about these...

Btw; -z:db (double-buffering) doesn't do any good in this case. It
     currently only affects .wav and .raw inputs.
  

-- 
Kai Vehmanen <kaiv@wakkanet.fi> -------- CS, University of Turku, Finland
 . http://www.wakkanet.fi/ecasound/ - linux multitrack audio processing
 . http://www.wakkanet.fi/sculpscape/ - ambient-idm-rock-... mp3/ra/wav

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