30 Mar
2006
30 Mar
'06
5:34 p.m.
On Thu, Mar 30, 2006 at 04:34:43PM +1000, Erik de Castro Lopo wrote:
torbenh(a)gmx.de wrote:
ok... the program is a jack application, that opens an alsa pcm device
(obviously not the one, jackd is bound to) and either outputs or inputs
the sound.
On Wed, Mar 29, 2006 at 11:47:30PM +1000, Erik de
Castro Lopo wrote:
Just out of curiosity, what kind of hardware are you running this
on and what sort of performance would you find acceptable for your
application. An estimate that provides: Tobias Scharnberg wrote:
However, please do not use linear resampling; its just too crappy.
urgh... i just switched my local copies of alsa_in and _out to linear
resampling, because SRC_SINC_FASTEST was eating CPU juice.
- input and output sample rates
input is usually 48000 or 44100 (the jackd samplerate)
outputrate depends on the soundcard used. 48k or 44k1 +- 10 Hz varying
with clock drift... and calculation of resampling factor in float.
i will improve the detection algorithm soon again.
so that the samplerate is changing slower...
- samples per second per channel throughput wrt
the output rate
realtime.
when the jack source clock is not very bursty (ie LAN or local)
2 channels take 7% cpu on an athlon xp 2000
with a bursty clock source from the internet the cpu usage in top is
much higher. like 20% or so.
a little too much for a soundcard IO :)
would give me the best idea of what you are after.
i hope you get what i am after now. i am heavily exercising libsrc...
Erik
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Erik de Castro Lopo
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torben Hohn
http://galan.sourceforge.net -- The graphical Audio language