From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tim Blechmann <tim@klingt.org>
Subject: Re: pointer callback question
Date: Thu, 12 Feb 2009 19:04:10 +0100
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To: Takashi Iwai <tiwai@suse.de>
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Takashi Iwai wrote:
> At Thu, 12 Feb 2009 18:55:49 +0100,
> Tim Blechmann wrote:
>>>> the brief log is (4 periods of 64 frames):
>>>> stream_pointer at 64
>>>> stream_pointer at 128
>>>> stream_pointer at 192
>>>> stream_pointer at 256
>>> This is invalid.  The pointer callback must return 0 in this case.
>>> The value the pointer callback returns is between 0 and buffer_size-1=
=2E
>> sry, typo, 5 periods of 64 frames
>=20
> Then it must be OK.  If the stream is stopped, it's likely by the
> buffer underrun detection or so...

is there any way to compile alsa to get some debugging information about
that?

> BTW, you should be sure that the buffer size is aligned to the period=20
> size if such a design is assumed.  Without the extra constraint, it
> could be unaligned as default.

hm, afaict alignment should be ok ...

thnx, tim

--=20
tim@klingt.org
http://tim.klingt.org

A good composer does not imitate; he steals.
  Igor Stravinsky


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