Re: [virtio-comment] virtio sound: add missing definitions for 12 and 24kHz sampling rates

[Anton Yakovlev <anton.yakovlev@opensynergy.com>]

Hi Manos, Andreas,

Actually, I think it would make sense to add 12kHz, 24kHz and also 352800kHz
to the list of supported frame rates.


Kind regards,

On 12.11.2023 23:04, Manos Pitsidianakis wrote:
> Hello Andreas,
>
> The spec says it is purposely modeled to be compatible with the HDA spec. HDA 
> is optimized for specific multiples or submultiples of 44.1 kHz and 48 kHz. 
> Specifically, look at "5.4 Handling Stream Independent Sample Rates" and 
> "Table 56. Defined Sample Rates". My (unexperienced) understanding of the 
> following statement is that using such rates with controller hardware that is 
> made for HDA will result in timing issues:
>
> > This implies that the controller and link must also provide for an exact 
> > sample-rendering rate at the codec, in order to avoid any long term drift 
> > between sample delivery and rendering and the subsequent over(under)-run of 
> > codec buffers.
>
> https://ddec1-0-en-ctp.trendmicro.com:443/wis/clicktime/v1/query?url=https%3a%2f%2fwww.intel.com%2fcontent%2fdam%2fwww%2fpublic%2fus%2fen%2fdocuments%2fproduct%2dspecifications%2fhigh%2ddefinition%2daudio%2dspecification.pdf&umid=d569f403-01a9-4519-8038-4bb35906ff78&auth=53c7c7de28b92dfd96e93d9dd61a23e634d2fbec-cb72c66b78900b97f31176a2a470cdf7d28d8f94
>
> If that is the case, I think the best approach would be to specify a non-HDA 
> mode of operation to support more sound hardware. The most straight-forward 
> solution though is for you to resample the audio before and after it goes 
> through virtio-sound.
>
>
> Regards,
>
> -- Manos Pitsidianakis
> Emulation and Virtualization Engineer at Linaro Ltd
>
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--
Anton Yakovlev
Senior Software Engineer

OpenSynergy GmbH
Rotherstr. 20, 10245 Berlin