From: Daniel Mack <daniel@caiaq.de>
To: Alex Lee <alexlee188@gmail.com>
Cc: tiwai@suse.de, alsa-devel@alsa-project.org, clemens@ladisch.de
Subject: Re: [PATCH 3/4] ALSA: usb-audio: parse UAC2 sample rate ranges correctly
Date: Mon, 14 Jun 2010 14:41:31 +0200 [thread overview]
Message-ID: <20100614124131.GO17833@buzzloop.caiaq.de> (raw)
In-Reply-To: <AANLkTin3LMCu_f2emsh6kAT8H6G3zKF8Ud-ZUMpZjbmg@mail.gmail.com>
On Fri, Jun 11, 2010 at 10:59:44PM +0800, Alex Lee wrote:
> If the device has a variable clock, it may report a RES of only 1. So you
> may end up with thousands (and even millions) of sample rates. It might be
> better to have separate code to cater to discrete clocks vs variable clocks.
Just for the records: this is exactly what Mac OS X does, and it will
comsume 100% CPU when a device with such descriptors is plugged in. So
even though this is now sanely handled by ALSA, it really shouldn't be
done that way by implementors.
Daniel
next prev parent reply other threads:[~2010-06-14 12:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-11 13:33 usb-audio: some UAC2 fixes Daniel Mack
2010-06-11 13:33 ` [PATCH 1/4] ALSA: usb-audio: add check for faulty clock in parse_audio_format_rates_v2() Daniel Mack
2010-06-11 13:33 ` [PATCH 2/4] ALSA: usb-audio: fix control messages for USB_RECIP_INTERFACE Daniel Mack
2010-06-11 13:33 ` [PATCH 3/4] ALSA: usb-audio: parse UAC2 sample rate ranges correctly Daniel Mack
[not found] ` <AANLkTin3LMCu_f2emsh6kAT8H6G3zKF8Ud-ZUMpZjbmg@mail.gmail.com>
2010-06-11 15:04 ` Daniel Mack
2010-06-11 15:14 ` Clemens Ladisch
2010-06-11 15:18 ` Daniel Mack
2010-06-11 15:34 ` [PATCH 1/4] ALSA: usb-audio: add check for faulty clock in parse_audio_format_rates_v2() Daniel Mack
2010-06-11 16:10 ` Takashi Iwai
2010-06-11 15:34 ` [PATCH 2/4] ALSA: usb-audio: fix control messages for USB_RECIP_INTERFACE Daniel Mack
2010-06-11 15:34 ` [PATCH 3/4] ALSA: usb-audio: parse UAC2 sample rate ranges correctly Daniel Mack
2010-06-11 15:43 ` Takashi Iwai
2010-06-11 15:46 ` Daniel Mack
2010-06-11 15:54 ` Takashi Iwai
2010-06-11 15:34 ` [PATCH 4/4] ALSA: usb-audio: fix UAC2 control value queries Daniel Mack
2010-06-11 15:18 ` [PATCH 3/4] ALSA: usb-audio: parse UAC2 sample rate ranges correctly Mark Brown
2010-06-14 12:41 ` Daniel Mack [this message]
2010-06-11 13:33 ` [PATCH 4/4] ALSA: usb-audio: fix UAC2 control value queries Daniel Mack
2010-06-11 13:51 ` Daniel Mack
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