From: Clemens Ladisch <clemens@ladisch.de>
To: Trent Piepho <tpiepho@gmail.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: snd_pcm_drain and partial periods
Date: Fri, 25 Nov 2011 18:38:56 +0100 [thread overview]
Message-ID: <4ECFD2B0.9050703@ladisch.de> (raw)
In-Reply-To: <CA+7tXihNEmsjq=xkb5T22smnCcVM8vdBxMYwHSz4YFbMWo5_5g@mail.gmail.com>
Trent Piepho wrote:
> When the driver schedules the final period, couldn't it check if the
> device is draining, and if so try to end playback at the right time.
The ALSA framework was designed for cards where DMA doesn't need to
be scheduled continuously, so it is assumed that stopping happens
asynchronously.
You could try to check the PCM state, but it's possible that the call
to snd_pcm_drain() happens after you've scheduled the final period.
Regards,
Clemens
next prev parent reply other threads:[~2011-11-25 17:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CA+7tXihfkZd6+UmnwJiyLgwo+6PoU9fWvzNhz7FKzy7DNgAWMw@mail.gmail.com>
2011-11-23 23:44 ` snd_pcm_drain and partial periods Trent Piepho
2011-11-24 14:17 ` Clemens Ladisch
2011-11-25 16:37 ` Trent Piepho
2011-11-25 17:38 ` Clemens Ladisch [this message]
2011-11-27 6:05 ` Trent Piepho
2011-11-28 1:16 ` Raymond Yau
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