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From: Clemens Ladisch <clemens@ladisch.de>
To: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: [PATCH 2/2] ALSA: hda: support for wallclock timestamps
Date: Thu, 14 Jun 2012 10:15:35 +0200	[thread overview]
Message-ID: <4FD99DA7.60206@ladisch.de> (raw)
In-Reply-To: <4FD96F57.3090502@linux.intel.com>

Pierre-Louis Bossart wrote:
> As long as you have 2 periods or events per 179s, the wrap-around can
> be detected without any issues. It's explicitely handled in the code.

AFAICS there is no code that enforces the 179s restriction.

And why are you using a separate wallclock timer instead of the sample
count?  Does the higher resolution result in a noticeable improvement?

How should userspace detect streams whose sample clock is not
synchronous with this wall clock, such as digital inputs?


Regards,
Clemens

  reply	other threads:[~2012-06-14  8:15 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-13 20:26 [PATCH 0/2] RFC: support for audio wall clock Pierre-Louis Bossart
2012-06-13 20:26 ` [PATCH 1/2] ALSA: core: add hooks for audio timestamps read from WALLCLOCK Pierre-Louis Bossart
2012-06-14  7:27   ` Takashi Iwai
2012-06-15 10:07     ` Pierre-Louis Bossart
2012-06-13 20:26 ` [PATCH 2/2] ALSA: hda: support for wallclock timestamps Pierre-Louis Bossart
2012-06-14  3:32   ` Wang Xingchao
2012-06-14  4:57     ` Pierre-Louis Bossart
2012-06-14  8:15       ` Clemens Ladisch [this message]
2012-06-14 17:01         ` Pierre-Louis Bossart
2012-06-14  7:38   ` Takashi Iwai
2012-06-15 10:02     ` Pierre-Louis Bossart
2012-06-15 10:34       ` Takashi Iwai
  -- strict thread matches above, loose matches on Subject: below --
2012-06-28 21:12 [PATCH 0/2] RFC: support for audio wall clock Pierre-Louis Bossart
2012-06-28 21:12 ` [PATCH 2/2] ALSA: hda: support for wallclock timestamps Pierre-Louis Bossart
2012-09-28  8:15 [PATCH 1/2] ALSA: core: add hooks for audio timestamps Pierre-Louis Bossart
2012-09-28  8:15 ` [PATCH 2/2] ALSA: hda: support for wallclock timestamps Pierre-Louis Bossart
2012-09-28  9:33   ` Clemens Ladisch
2012-09-29 20:12     ` Pierre-Louis Bossart
2012-09-30 10:12       ` Clemens Ladisch
2012-09-29  1:47   ` Raymond Yau

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