Re: problem linking pcm timer to midi timer at SB Audigy

["Clemens Ladisch" <cladisch@fastmail.net>]

Gerald Grabner wrote:
> I'm having troubles with linking the pcm timer to the midi timer for a
> SB Audigy. I slightly adapted the code of Steve deRosier
> [http://thread.gmane.org/gmane.linux.alsa.devel/22156/focus=22160], my
> function is listed below. While it works with an ES1938 card, it
> doesn't with a SB Audigy: If I'm trying to record audio (generated
> from a midi signal I'm sending from the same card), I only hear the
> first note sent. Obviously the timing is completely wrong. The problem
> doesn't occur for pcm playback.

Look into /proc/asound/seq/queues and /proc/asound/seq/timers to see
what's going on.

> Unfortunatly, I didn't find much documentation about cards, devices
> and subdevices.
> Do I have to choose a particular one for the Audigy?

Yes.  See "arecord -l" for a list of recording devices.  You have to
choose the same device that you're using for recording.

> Why the "SDevice = SDevice << 1;" statement?

The subdevice number of the timer is not the same as the PCM subdevice
number, see /proc/asound/timers.

> Where can I find documentation on this topic?

This stuff is basically undocumented.


Regards,
Clemens

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