From: "Alexander E. Patrakov" <patrakov@gmail.com>
To: Clemens Ladisch <clemens@ladisch.de>,
ALSA Development Mailing List <alsa-devel@alsa-project.org>,
Takashi Iwai <tiwai@suse.de>,
David Henningsson <david.henningsson@canonical.com>,
Takashi Sakamoto <o-takashi@sakamocchi.jp>
Subject: Re: Master Plan on rewinding
Date: Tue, 09 Sep 2014 21:55:05 +0600 [thread overview]
Message-ID: <540F22D9.8010203@gmail.com> (raw)
In-Reply-To: <540F047F.7090607@ladisch.de>
09.09.2014 19:45, Clemens Ladisch wrote:
> Alexander E. Patrakov wrote:
>> can the proposed heuristic (minimum period size for a given sample
>> rate, number of channels and sample format) be useful as an upper-
>> bound approximation of the pointer update granularity for cards that
>> are "rewindable even further than the nearest period"?
>
> No; USB precsion depends on the URB size, which is roughly proportional
> to (but smaller than) the period size.
Thanks for the explanation. It was very useful.
At this point, I am tempted to not express this "less than the period
size but depends on it" rule, and classify USB audio devices as
"Rewindable down to the period size", even though it is a pessimization.
Also (sorry for the off-topic) this explanation completely crystallizes
my opinion about possible misuse of the SNDRV_PCM_INFO_BATCH flag in the
snd-usb-audio driver or PulseAudio. My opinion now is: there is no
misuse on either side.
--
Alexander E. Patrakov
next prev parent reply other threads:[~2014-09-09 15:55 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-07 15:16 Master Plan on rewinding Alexander E. Patrakov
2014-09-07 18:38 ` Tanu Kaskinen
2014-09-07 19:05 ` Alexander E. Patrakov
2014-09-07 20:51 ` Clemens Ladisch
2014-09-08 3:06 ` Raymond Yau
2014-09-08 7:31 ` Alexander E. Patrakov
2014-09-09 8:43 ` Clemens Ladisch
2014-09-09 8:55 ` Alexander E. Patrakov
2014-09-09 9:08 ` David Henningsson
2014-09-09 9:31 ` Alexander E. Patrakov
2014-09-21 2:02 ` Raymond Yau
2014-09-22 13:20 ` Lars-Peter Clausen
2014-09-22 13:36 ` Alexander E. Patrakov
2014-09-22 13:44 ` Lars-Peter Clausen
2014-09-23 8:29 ` Raymond Yau
2014-09-23 10:22 ` Alexander E. Patrakov
2014-09-09 13:45 ` Clemens Ladisch
2014-09-09 15:55 ` Alexander E. Patrakov [this message]
2014-09-09 16:09 ` Takashi Iwai
2014-09-07 23:12 ` David Henningsson
2014-09-09 19:56 ` Pierre-Louis Bossart
2014-09-10 5:38 ` Alexander E. Patrakov
2014-09-08 7:34 ` Lars-Peter Clausen
2014-09-08 7:59 ` David Henningsson
2014-09-08 8:46 ` Alexander E. Patrakov
2014-09-08 9:26 ` David Henningsson
2014-09-08 10:21 ` Alexander E. Patrakov
2014-09-09 8:43 ` Clemens Ladisch
2014-09-11 3:49 ` Raymond Yau
2014-09-11 4:19 ` A. C. Censi
2014-09-13 9:15 ` Raymond Yau
2014-09-11 5:28 ` Alexander E. Patrakov
2014-09-11 6:21 ` Raymond Yau
2014-09-13 8:57 ` Raymond Yau
2014-09-13 10:43 ` Alexander E. Patrakov
2014-09-13 11:33 ` Raymond Yau
2014-09-13 11:36 ` Alexander E. Patrakov
2014-09-13 18:35 ` Alexander E. Patrakov
2014-09-14 11:37 ` Raymond Yau
2014-09-14 12:07 ` Alexander E. Patrakov
2014-09-15 2:43 ` Raymond Yau
2014-09-15 9:19 ` Takashi Iwai
2014-09-15 9:58 ` Alexander E. Patrakov
2014-09-15 10:08 ` Takashi Iwai
2014-09-15 17:01 ` Pierre-Louis Bossart
2014-09-15 17:14 ` Alexander E. Patrakov
2014-09-15 18:08 ` Takashi Iwai
2014-09-18 1:15 ` Raymond Yau
2014-09-21 9:22 ` Alexander E. Patrakov
2014-09-21 9:53 ` Clemens Ladisch
2014-09-21 10:56 ` Alexander E. Patrakov
2014-09-22 3:27 ` Raymond Yau
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