From: Clemens Ladisch <clemens@ladisch.de>
To: Raymond Yau <superquad.vortex2@gmail.com>
Cc: ALSA Development Mailing List <alsa-devel@alsa-project.org>
Subject: Re: [PATCH] ALSA ymfpci - Add "Playback" to FM Legacy Volume control
Date: Mon, 12 Sep 2011 16:02:05 +0200 [thread overview]
Message-ID: <4E6E10DD.2060508@ladisch.de> (raw)
In-Reply-To: <CAN8cciaqt_eBLGeSA0XYaLt0B5R1M0ituHt-DDFrZHRazcR_gA@mail.gmail.com>
Raymond Yau wrote:
> How accurate is the ymfpci timer ?
The period interrupts are not accurate at all. The ymfpci hardware
internally uses fixed periods of 256 frames at 48 kHz; the driver
reports a period interrupt when the next hardware interrupt at or after
a period boundary occurs. The current position reported by the hardware
is the position at the time of the last hardware interrupt.
> my ymf724f seem play quite well with alsa "hw" device but with bad
> noise with alsa-pulse plugin (e.g. aplay when not using default period
> times ) and it also occurrs on benshee on ubuntu 11.4 live cd
It should be possible to increase accuracy by using the hardware period
parameters (48 kHz _and_ 256 frames/period).
TODO: implement support for the NORESAMPLE flag.
Regards,
Clemens
prev parent reply other threads:[~2011-09-12 14:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-09 11:25 [PATCH] ALSA ymfpci - Add "Playback" to FM Legacy Volume control Raymond Yau
2011-09-11 15:49 ` Clemens Ladisch
2011-09-12 2:45 ` Raymond Yau
2011-09-12 14:02 ` Clemens Ladisch [this message]
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