From: Clemens Ladisch <clemens-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
To: Pavel Hofman <pavel.hofman-49v42ZqfXVBBDgjK7y7TUQ@public.gmane.org>
Cc: Alan Stern
<stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>,
alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org,
Takashi Iwai <tiwai-l3A5Bk7waGM@public.gmane.org>,
Eldad Zack <eldad-v6AqZgAe4C4dvzyIwGCCOg@public.gmane.org>,
USB list <linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Daniel Mack <zonque-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
James Stone <jamesmstone-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: [alsa-devel] Buffer size for ALSA USB PCM audio
Date: Tue, 27 Aug 2013 10:11:20 +0200 [thread overview]
Message-ID: <521C5F28.70309@ladisch.de> (raw)
In-Reply-To: <521C5CC2.7030809-49v42ZqfXVBBDgjK7y7TUQ@public.gmane.org>
Pavel Hofman wrote:
> On 27.8.2013 09:19, Clemens Ladisch wrote:
>> The driver cannot control how many samples actually end up in a capture
>> packet,...
>
> Does this reasoning apply to asynchronous playback too?
No.
> I understand the driver has some control, but has to satisfy the endpoint
> feedback requests.
When the driver wants to submit a playback URB, it knows how many
samples it is copying into the packets. (There is a delay between the
device reporting its desired rate and the driver actually using it.)
Regards,
Clemens
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next prev parent reply other threads:[~2013-08-27 8:11 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-24 14:41 Buffer size for ALSA USB PCM audio Alan Stern
[not found] ` <Pine.LNX.4.44L0.1307241013190.1313-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-07-24 14:54 ` Takashi Iwai
[not found] ` <s5hsiz4knyf.wl%tiwai-l3A5Bk7waGM@public.gmane.org>
2013-07-24 15:22 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1307241108180.1313-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-07-24 15:26 ` Takashi Iwai
[not found] ` <s5hob9skmgs.wl%tiwai-l3A5Bk7waGM@public.gmane.org>
2013-07-24 15:43 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1307241138180.1313-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-07-25 8:24 ` Takashi Iwai
[not found] ` <s5hbo5rkpwm.wl%tiwai-l3A5Bk7waGM@public.gmane.org>
2013-07-25 14:50 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1307251043470.882-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-07-29 10:03 ` Takashi Iwai
[not found] ` <s5hvc3tfzt7.wl%tiwai-l3A5Bk7waGM@public.gmane.org>
2013-07-29 15:00 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1307291041410.1479-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-07-29 17:12 ` Clemens Ladisch
[not found] ` <51F6A262.6010800-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2013-07-29 18:20 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1307291400450.1479-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-07-29 19:23 ` Daniel Mack
[not found] ` <51F6C123.7020407-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-07-29 19:38 ` Alan Stern
2013-07-30 6:43 ` [alsa-devel] " Takashi Iwai
[not found] ` <s5hob9k5z0b.wl%tiwai-l3A5Bk7waGM@public.gmane.org>
2013-08-01 17:11 ` Eldad Zack
2013-08-01 17:37 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1307311645190.1546-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-12 13:22 ` [alsa-devel] " Takashi Iwai
[not found] ` <s5h7gfryrgh.wl%tiwai-l3A5Bk7waGM@public.gmane.org>
2013-08-12 14:53 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308121036460.1489-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-12 15:04 ` Takashi Iwai
[not found] ` <s5hvc3bx85c.wl%tiwai-l3A5Bk7waGM@public.gmane.org>
2013-08-12 16:50 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308121218590.1489-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-13 21:06 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308131659320.897-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-13 21:34 ` Daniel Mack
[not found] ` <520AA657.5010704-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-08-14 20:50 ` Eldad Zack
2013-08-15 16:06 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308151136180.905-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-18 16:56 ` Clemens Ladisch
2013-08-14 18:34 ` Clemens Ladisch
[not found] ` <520BCDBC.2060507-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2013-08-21 21:37 ` [alsa-devel] " Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308211654010.1297-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-26 18:37 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308261419100.886-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-27 6:32 ` James Stone
[not found] ` <CABRv+91ZGMHbHZFW0gYOL-zGP=HbmiJU51z-_C_2Jj+5ATisrA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-08-27 16:53 ` Alan Stern
2013-08-27 7:19 ` Clemens Ladisch
2013-08-27 8:01 ` Pavel Hofman
[not found] ` <521C5CC2.7030809-49v42ZqfXVBBDgjK7y7TUQ@public.gmane.org>
2013-08-27 8:11 ` Clemens Ladisch [this message]
[not found] ` <521C5315.3030207-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2013-08-27 16:50 ` [alsa-devel] " Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308271246130.1810-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-27 20:03 ` Clemens Ladisch
[not found] ` <521D060E.4-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2013-08-27 20:11 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308271608430.940-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-28 6:41 ` Clemens Ladisch
[not found] ` <521D9BAE.2060508-P6GI/4k7KOmELgA04lAiVw@public.gmane.org>
2013-08-28 18:46 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308281441090.1541-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-29 8:10 ` James Stone
[not found] ` <CABRv+92cJPKVT9f2dyHJ_rg6sX3hP9Ct6QFas771fS79h7Eu2w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-08-29 15:00 ` Alan Stern
[not found] ` <Pine.LNX.4.44L0.1308291059300.1170-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2013-08-29 17:45 ` James Stone
2013-08-29 18:42 ` Alan Stern
[not found] ` <CABRv+93oVW0rDEJnNeGyfqem2PM42b28-z9q+Ze8r7rky7szDA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-03 14:04 ` [alsa-devel] " Alan Stern
2013-09-22 21:50 ` Eldad Zack
2013-09-09 14:20 ` Daniel Mack
[not found] ` <522DD92C.4020009-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-09-09 15:36 ` Alan Stern
2013-08-13 21:54 ` Clemens Ladisch
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