From: Paul Davis <paul@linuxaudiosystems.com>
To: James Courtier-Dutton <James@superbug.demon.co.uk>
Cc: Jaroslav Kysela <perex@suse.cz>,
Florian Schmidt <mista.tapas@gmx.net>,
Takashi Iwai <tiwai@suse.de>,
alsa-devel@lists.sourceforge.net
Subject: Re: difference between OSS mmap and alsa mmap? [alsa-oss]
Date: Tue, 24 Aug 2004 11:47:22 -0400 [thread overview]
Message-ID: <200408241547.i7OFlMKA028889@localhost.localdomain> (raw)
In-Reply-To: Your message of "Tue, 24 Aug 2004 15:30:45 BST." <412B5115.5020309@superbug.demon.co.uk>
>I also think that the best way to handle this is to use double buffering.
>So the user app writes to a ring buffer, and alsa just copies one period
>at a time to the hardware buffer each time periods_elapsed is called.
this doesn't work. the whole point of the OSS mmap model is that the
app always has access to the entire hardware buffer, not just the
current period. this is why its so hard to make it work correctly in
emulation mode.
--p
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prev parent reply other threads:[~2004-08-24 15:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-05 12:42 difference between OSS mmap and alsa mmap? [alsa-oss] Florian Schmidt
2004-07-05 13:13 ` Paul Davis
2004-07-05 13:19 ` Takashi Iwai
2004-08-24 11:57 ` Florian Schmidt
2004-08-24 12:20 ` Florian Schmidt
2004-08-24 13:41 ` Jaroslav Kysela
2004-08-24 14:30 ` James Courtier-Dutton
2004-08-24 15:47 ` Paul Davis [this message]
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