From: "Alexander E. Patrakov" <patrakov@gmail.com>
To: Mauro Carvalho Chehab <m.chehab@samsung.com>,
Clemens Ladisch <clemens@ladisch.de>
Cc: Takashi Iwai <tiwai@suse.de>,
alsa-devel@alsa-project.org,
Mauro Carvalho Chehab <mchehab@infradead.org>,
Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: [alsa-devel] [PATCH 1/3] sound: Add a quirk to enforce period_bytes
Date: Mon, 16 Jun 2014 20:38:52 +0600 [thread overview]
Message-ID: <539F017C.90408@gmail.com> (raw)
In-Reply-To: <20140616112110.3f509262.m.chehab@samsung.com>
16.06.2014 20:21, Mauro Carvalho Chehab wrote:
> Both xawtv and tvtime use the same code for audio:
> http://git.linuxtv.org/cgit.cgi/xawtv3.git/tree/common/alsa_stream.c
>
> There's an algorithm there that gets the period size form both the
> capture and the playback cards, trying to find a minimum period that
> would work properly for both.
I don't see any adaptive resampler (similar to what module-loopback does
in pulseaudio) there. Without that, or dynamically controlling the audio
capture clock PLL in the tuner, xruns are unavoidable when transferring
data between two unrelated cards.
So, until any further evidence appears, I think it is a common bug in
these audio codes.
--
Alexander E. Patrakov
next prev parent reply other threads:[~2014-06-16 14:38 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-14 16:16 [PATCH 0/3] Auvitek au0828 fixups Mauro Carvalho Chehab
2014-06-14 16:16 ` [PATCH 1/3] sound: Add a quirk to enforce period_bytes Mauro Carvalho Chehab
2014-06-16 7:39 ` [alsa-devel] " Clemens Ladisch
2014-06-16 13:22 ` Devin Heitmueller
2014-06-16 15:05 ` [alsa-devel] " Mauro Carvalho Chehab
2014-06-18 8:20 ` Clemens Ladisch
2014-06-16 14:21 ` Mauro Carvalho Chehab
2014-06-16 14:38 ` Alexander E. Patrakov [this message]
2014-06-16 16:24 ` Mauro Carvalho Chehab
2014-06-16 17:16 ` Alexander E. Patrakov
2014-06-16 18:59 ` Mauro Carvalho Chehab
2014-06-16 19:04 ` Devin Heitmueller
2014-06-16 19:22 ` Mauro Carvalho Chehab
2014-06-18 8:21 ` Clemens Ladisch
2014-06-14 16:16 ` [PATCH 2/3] sound: simplify au0828 quirk table Mauro Carvalho Chehab
2014-06-14 16:16 ` [PATCH 3/3] sound: Update au0828 quirks table Mauro Carvalho Chehab
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