From: Abramo Bagnara <abramo.bagnara@libero.it>
To: Jaroslav Kysela <perex@perex.cz>
Cc: ALSA development <alsa-devel@alsa-project.org>
Subject: Re: PCM API update
Date: Sat, 12 Oct 2002 11:54:35 +0200 [thread overview]
Message-ID: <3DA7F15B.A8E89CB4@libero.it> (raw)
In-Reply-To: Pine.LNX.4.33.0210121134040.1975-100000@pnote.perex-int.cz
Jaroslav Kysela wrote:
>
>
> In this case, I propose to change snd_pcm_avail() to snd_pcm_hwsync()
> function with description: "synchronize r/w pointers with hardware".
> Really, after some thinking, the return value from snd_pcm_avail() cannot
> be used for nothing serious. I simply don't like that delay() functions
> do more arithmetic than necessary. Overdesign has been criticized in this
> list, too.
Let examine kernel level: snd_pcm_{plaback,capture}_delay do a
snd_pcm_update_hw_ptr and a snd_pcm_{playback_hw,capture}_avail (that's
only a wrap safe difference).
Are you sure you want to add another ioctl and another API function in
all the PCM classes just to avoid a subtraction?
--
Abramo Bagnara mailto:abramo.bagnara@libero.it
Opera Unica Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy
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next prev parent reply other threads:[~2002-10-12 9:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-11 18:43 PCM API update Jaroslav Kysela
2002-10-11 20:13 ` Abramo Bagnara
2002-10-12 8:54 ` Jaroslav Kysela
2002-10-12 9:12 ` Abramo Bagnara
2002-10-12 9:37 ` Jaroslav Kysela
2002-10-12 9:54 ` Abramo Bagnara [this message]
2002-10-12 10:10 ` Jaroslav Kysela
2002-10-12 10:24 ` Abramo Bagnara
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