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From: Rob Duncan <rduncan@tesla.com>
To: alsa-devel@alsa-project.org
Subject: More snd_pcm_ioplug_avail_update() questions
Date: Wed, 25 Jul 2018 14:52:36 -0700	[thread overview]
Message-ID: <dw77emin53c7a3.fsf@tesla.com> (raw)

Is it required that all available data has been committed between calls
to snd_pcm_ioplug_avail_update() on an IO plugin capture stream?

If this is not a requirement then there can still be uncommitted data in
the mmap after the current appl_ptr.  This data will get overwritten by
the transfer call.

If it is a requirement then snd_pcm_rate_avail_update() seems to be
doing the wrong thing, because it only commits in units of the period
size, which means that there could be a partial period left in the mmap.

Can someone clarify what the contract is for these calls?

Thanks,

Rob.

             reply	other threads:[~2018-07-25 21:52 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-25 21:52 Rob Duncan [this message]
2018-07-26  7:04 ` More snd_pcm_ioplug_avail_update() questions Takashi Iwai
2018-07-26 14:19   ` Rob Duncan
2018-07-26 14:37     ` Takashi Iwai
2018-07-26 15:02       ` Rob Duncan
2018-07-26 15:14         ` Takashi Iwai
2018-07-30 18:55           ` Rob Duncan
2018-07-31  8:21             ` Takashi Iwai

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