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Re: [Qemu-devel] [PATCH v4 11/11] audio/rfc: remove PLIVE and PERIOD opt
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [PATCH v4 11/11] audio/rfc: remove PLIVE and PERIOD options |
Date: |
Wed, 14 Mar 2012 12:49:13 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120216 Thunderbird/10.0.1 |
On 03/14/12 12:20, Marc-André Lureau wrote:
> Hi
>
> On Wed, Mar 14, 2012 at 10:22 AM, Gerd Hoffmann <address@hidden> wrote:
>> On 03/13/12 16:47, malc wrote:
>>> On Tue, 13 Mar 2012, Marc-Andr? Lureau wrote:
>>>
>>>> - period seems to be unused now
>>
>>> Period on the other hand is unused because i somehow missed the subtle
>>> change of behavior in one of the patches made by, i think, Gerd.
>>
>> Uhm, which patch? I think that wasn't intentional, at least I can't
>> remember intentionally disabling period. Maybe I missed the subtle
>> change of behavior too.
>
> Could be:
>
> 39deb1e496de81957167daebf5cf5d1fbd5e47c2
Yes, looks like this one is it.
>> I do see the point in having this configurable as this is a cpu overhead
>> vs. latency tradeoff which one might want to tweak depending on the use
>> case.
>
> But that would impact a/v sync, or can you report added latency back
> to the guest somehow? I imagine audio backend latency should depend on
> the configured device buffering/latency, not on an environment tweak.
Sure, with lower latency you get better a/v sync too.
Guest interfacing is next to impossible I think, simply because real
hardware has no need for that and thus the interfaces simply don't exist
in the hardware we are emulating. We can try to fix that with a virtio
soundcard which has such interfaces, but it could be this simply shifts
the issue from the driver/hardware interface to the os-kernel/driver
interface.
cheers,
Gerd
- Re: [Qemu-devel] [PATCH v4 05/11] hw/ac97: add support for volume control, (continued)
[Qemu-devel] [PATCH v4 09/11] Allow controlling volume with PulseAudio backend, Marc-André Lureau, 2012/03/13
[Qemu-devel] [PATCH v4 10/11] Enable mixemu by default, add runtime option, Marc-André Lureau, 2012/03/13
[Qemu-devel] [PATCH v4 07/11] Do not use pa_simple PulseAudio API, Marc-André Lureau, 2012/03/13
[Qemu-devel] [PATCH v4 11/11] audio/rfc: remove PLIVE and PERIOD options, Marc-André Lureau, 2012/03/13
[Qemu-devel] [PATCH v4 08/11] configure: pa_simple is not needed anymore, Marc-André Lureau, 2012/03/13
[Qemu-devel] [PATCH v4 06/11] audio/spice: add support for volume control, Marc-André Lureau, 2012/03/13