On Sun, 28 Sep 2003, Erik de Castro Lopo wrote:
> Hi all,
>
> I was hoping someone might be able to shine some light on the
> following issue. I am currently opening an ALSA device for
> record say 44.1 kHz and reading 32k frames of data at a time.
>
> Now with the above setup, if I want to do a meter, I can only
> only update the meter every 32k frames or a little more than
> once a second which makes for a very poor display.
>
> So, looking at /usr/include/alsa/pcm.h I find some function
> definitions which seem like they are meant for metering purposes.
> Unfortunalety I can't seem to find any documentation on the ALSA
> site nor can I find example code showing how this stuff is
> used.
>
> Am I missing something or does this stuff just not exist? Do
> these snd_pcm_meter_* functions work? Anybody have working code
> that uses these things?
The examples are in alsa-lib/src/pcm/scopes directory, but don't expect
a better response times, because the meter plugin is also activated
when an application reads or writes data to device.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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