Now when a device is opened with open() call OSS driver automatically
sets some default sample rate (usually 48000). I think it is good to
have an option to disable setting default sample rate when opening a
device.
This may be some compile option or an option from some configuration file (I
don't insist that this should be done by default, it should be done for
those who absolutely need it). It may be useful sometimes.
For example, on my sound card (ESI Juli@
) changing sample rate causes an audible click (I believe it is not an
OSS driver fault but some hardware limitation, the same effect is
observable on WinXP by the way).
This effect may be noticeable when a series of audio file is
played. Suppose all files are in 44100, and
an audio player opens a device for each file (most common situation),
so for each file sample rate is set two times (48000 and 44100 then).
So when each file is started a click is audible.
But actually there is no much sense to switch sample rate when a device is
opened.
In this case just previously set sample rate will be used, and it is
desirable sometimes. The idea is that changing sample rate should be
done only when it is absolutely necesserily.
Anyway, audio applications need to set sample rate explicitly with
SNDCTL_DSP_SPEED call. I myself use OSS
compiled
with my own modification of audio_core.c where line that sets a
default sample rate when
a device is opened
is removed, and everything works fine. So it is not problem for me.
I just think that this may be useful for other people (for example for other
owners of ESI Juli@ card) who may experience similar problems.
Does anybody else think that it is worthy idea?
Regards,
Zakhar Levchenko
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