Hi all,

at the moment I am investigating in the issue described in [1]. This issue is already avoided by a workaround [2].

I am able to reproduce the issue with a more simple aplay use case using the following configuration: pcm_slave.adr3_tdm_8ch { pcm { type hw card "Loopback" device 0 } rate 48000 period_size 128 buffer_size 1024 channels 2 }

pcm.dshare_Playback_3 { type dmix ipc_key 600 ipc_perm 0660 ipc_gid audio var_periodsize true slave adr3_tdm_8ch }

pcm.AdevAcousticoutSpeech { type rate slave.pcm dshare_Playback_3 slave.rate 48000 }

$ modprobe snd_aloop $ aplay -v --period-size=352 -c2 -fS16_LE -r22500 -D AdevAcousticoutSpeech /dev/urandom aplay: ../../alsa-utils-1.1.5/aplay/aplay.c:1390: set_params: Assertion `err >= 0' failed. Aborted by signal Aborted...

It looks like the refinement fails. Now, I need your help because the intervals seems not to be handled in the same way in each function and I want to understand what is the correct interpretation of an interval.

For example snd_interval_checkempty() and snd_interval_single() conflicting with each other. snd_interval_checkempty() interprets (x x] and [x x) as an empty set but snd_interval_single() does not. (x x) seems not to be an empty set as implemented by snd_interval_single().

Therefore could someone please explain me what is the correct interpretation of the snd_interval_t in combination with openmin and openmax.

The following seems to be consistent (x x+1) and [x x+1) → x (see snd_interval_single() and snd_interval_value()) but it is different to what I have learnt at university.

So it would be very helpful if someone could direct me to the right definition. So I hope I could easier solve this issue.

[1] https://bugzilla.opensuse.org/show_bug.cgi?id=1033179 [2] http://git.alsa-project.org/?p=alsa-lib.git;a=commit;h=e736715a8ed4c86900594...

Best regards

Timo Wischer

Advanced Driver Information Technology GmbH Engineering Software Base (ADITG/ESB) Robert-Bosch-Str. 200 31139 Hildesheim Germany

Tel. +49 5121 49 6938 Fax +49 5121 49 6999 twischer@de.adit-jv.com

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