From: Clemens Ladisch <clemens@ladisch.de>
To: alsa-devel@alsa-project.org
Subject: Re: safe support for rewind in ALSA
Date: Wed, 10 Feb 2010 14:36:37 +0100 [thread overview]
Message-ID: <4B72B665.3060903@ladisch.de> (raw)
In-Reply-To: <4f3252891002100519h132fddb8t1f2bc56e97bf5c40@mail.gmail.com>
Raymond Yau wrote:
> ...
> The rest of those sound cards which have period_mins = 1 are regarded as
> broken by PA developer (e.g. intel8x0 ,emu10k1 , ens1371 , ... ) and aplay
> did not work with one period per buffer too.
>
> what is the hardware requirement for the driver to support one period per
> buffer ?
That the hardware can be programmed to generate only one interrupt per
buffer.
> if none of the those driver can be fixed
> why don't we change the period_min of all those broken drivers from 1 to 2
> ?
Because period_min has nothing to do with the brokenness. PA wants to
use as few periods as possible because it does not use period interrupts
but the DMA pointer, and it's the latter that is broken.
Regards,
Clemens
next prev parent reply other threads:[~2010-02-10 13:36 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-01 17:20 safe support for rewind in ALSA pl bossart
2010-02-01 18:00 ` Jaroslav Kysela
2010-02-01 22:40 ` pl bossart
2010-02-03 2:20 ` Raymond Yau
2010-02-03 18:03 ` Kai Vehmanen
2010-02-03 20:52 ` Kai Vehmanen
2010-02-03 22:57 ` pl bossart
2010-02-08 1:22 ` Raymond Yau
2010-02-02 2:53 ` Raymond Yau
2010-02-06 11:59 ` Raymond Yau
2010-02-17 15:30 ` Lennart Poettering
2010-02-18 1:31 ` Raymond Yau
2010-02-18 2:33 ` Lennart Poettering
2010-02-18 3:21 ` Raymond Yau
2010-02-01 18:01 ` Mark Brown
2010-02-01 18:05 ` Jaroslav Kysela
2010-02-01 21:28 ` Kai Vehmanen
2010-02-01 21:54 ` Kai Vehmanen
2010-02-08 22:59 ` Raymond Yau
2010-02-09 20:54 ` Kai Vehmanen
2010-02-10 13:19 ` Raymond Yau
2010-02-10 13:36 ` Clemens Ladisch [this message]
2010-02-11 6:52 ` Raymond Yau
2010-02-11 7:20 ` Clemens Ladisch
2010-02-11 7:27 ` Jaroslav Kysela
2010-02-15 3:03 ` Raymond Yau
2010-02-17 15:46 ` Lennart Poettering
2010-02-21 10:35 ` Kai Vehmanen
2010-02-22 9:07 ` Raymond Yau
[not found] ` <20100221203500.GH31800@tango.0pointer.de>
2010-02-22 19:15 ` semantics of SNDRV_PCM_INFO_BATCH (was: Re: safe support for rewind in ALSA) Kai Vehmanen
2010-02-23 7:02 ` Raymond Yau
2010-02-23 2:37 ` safe support for rewind in ALSA Raymond Yau
2010-02-23 2:44 ` Raymond Yau
2010-02-17 15:42 ` Lennart Poettering
2010-02-21 10:06 ` Kai Vehmanen
[not found] ` <20100221202144.GG31800@tango.0pointer.de>
2010-05-04 2:31 ` Raymond Yau
2010-02-17 15:39 ` Lennart Poettering
2010-02-17 15:36 ` Lennart Poettering
2010-02-17 15:35 ` Lennart Poettering
2010-02-01 22:10 ` Kai Vehmanen
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