From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: qemu-devel@nongnu.org
Subject: [Qemu-devel] Re: [PATCH 5/6] Add support for a USB audio device model
Date: Wed, 27 Oct 2010 10:13:09 -0700 [thread overview]
Message-ID: <4CC85DA5.9090704@linux.intel.com> (raw)
In-Reply-To: <1288195475-3807-6-git-send-email-kraxel@redhat.com>
On 10/27/2010 9:04 AM, Gerd Hoffmann wrote:
> From: H. Peter Anvin<hpa@linux.intel.com>
>
> This brings a usb audio device to qemu. Output only, fixed at
> 16bit stereo @ 480000 Hz. Based on a patch from
> H. Peter Anvin<hpa@linux.intel.com>
>
> Usage: add '-device usb-audio' to your qemu command line.
>
> Works sorta ok on a idle machine. Known issues:
>
> * Is *very* sensitive to latencies: when the uhci emulation misses one
> of the usb frame rate wakeups (1k/sec!) you'll loose/delay data from
> the audio stream, resulting in dropouts.
> * Also seems to not play very well with the usb tablet (and/or usb hub,
> to be investigated). Best try this as the only device on a usb bus.
> * Burns quite some CPU due to usb polling.
>
> In short: It brings the qemu usb emulation to its limits. Enjoy!
>
> Signed-off-by: Gerd Hoffmann<kraxel@redhat.com>
Please don't apply this. This patch is outdated and has several glaring
bugs. I can send a better patch later (I'm in an all-day meeting with
insanely bad networking.)
-hpa
next prev parent reply other threads:[~2010-10-27 17:14 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-27 16:04 [Qemu-devel] [PATCH 0/6] The windows 7 audio support patch series Gerd Hoffmann
2010-10-27 16:04 ` [Qemu-devel] [PATCH 1/6] pa: allow processing buffer pieces Gerd Hoffmann
2010-10-27 16:04 ` [Qemu-devel] [PATCH 2/6] pa: process 1/4 buffer max at once Gerd Hoffmann
2010-10-27 16:04 ` [Qemu-devel] [PATCH 3/6] pa: setup buffer attrs Gerd Hoffmann
2010-10-27 16:04 ` [Qemu-devel] [PATCH 4/6] pa: tweak config Gerd Hoffmann
2010-10-27 16:04 ` [Qemu-devel] [PATCH 5/6] Add support for a USB audio device model Gerd Hoffmann
2010-10-27 17:13 ` H. Peter Anvin [this message]
2010-10-28 8:01 ` [Qemu-devel] " Gerd Hoffmann
2010-10-28 15:23 ` H. Peter Anvin
2010-10-28 16:13 ` Gerd Hoffmann
2010-10-28 15:28 ` H. Peter Anvin
2010-10-28 15:29 ` H. Peter Anvin
2010-10-27 16:04 ` [Qemu-devel] [PATCH 6/6] Add Intel HD Audio support to qemu Gerd Hoffmann
2010-10-27 17:46 ` [Qemu-devel] [PATCH 0/6] The windows 7 audio support patch series malc
2010-10-27 17:51 ` malc
2010-10-28 8:47 ` Gerd Hoffmann
2010-10-28 9:46 ` malc
2010-10-28 10:06 ` malc
2010-10-28 10:06 ` Gerd Hoffmann
2010-10-28 22:21 ` Gerd Hoffmann
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