From: Ricardo Biehl Pasquali <pasqualirb@gmail.com>
To: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Cc: alsa-devel@alsa-project.org
Subject: Re: Coherence of status structure after SYNC_PTR
Date: Fri, 28 Dec 2018 14:28:24 -0200 [thread overview]
Message-ID: <20181228162824.GA28189@localhost.localdomain> (raw)
In-Reply-To: <20181228042124.GA30249@workstation>
On Fri, Dec 28, 2018 at 01:21:24PM +0900, Takashi Sakamoto wrote:
> On Fri, Dec 28, 2018 at 12:45:49PM +0900, Takashi Sakamoto wrote:
> > I note that there're some levels of timestamp and autio timestamp.
> > Additionally, audio timestamp is updated only in any hardware/software IRQs,
> > thus it's not available with 'no-period-wakeup' runtime, FYI.
>
> Oops. No, the audio timestamp can be updated in updating process of
> hardware pointer. A call of ioctl with SNDRV_PCM_IOCTL_STATUS and
> SNDRV_PCM_IOCTL_STATUS_EXT can return updated audio timestamp.
Thank you for the explanation!
Regarding the alsa-lib, pcm_hw, htimestamp():
Although not needed, adding a 'break' in the loop when
'mmap_status_fallbacked' is true would avoid another ioctl.
Cheers!
pasquali
prev parent reply other threads:[~2018-12-28 16:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-27 17:22 Coherence of status structure after SYNC_PTR Ricardo Biehl Pasquali
2018-12-28 3:45 ` Takashi Sakamoto
2018-12-28 4:21 ` Takashi Sakamoto
2018-12-28 16:28 ` Ricardo Biehl Pasquali [this message]
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