Re: virtio-video device IDs

[Alexander Gordeev <quic_agordeev@quicinc.com>]

On 22/12/2024 15:14, Parav Pandit wrote:
>> From: Alexander Gordeev <quic_agordeev@quicinc.com>
>> Sent: Friday, December 20, 2024 10:17 PM
>>
>> Hi,
>>
>> Currently there are two device IDs assigned for the future virtio video device:
>>  * 30 for the encoder
>>  * 31 for the decoder
>> I received feedback from our internal reviewers that in some cases it would
>> be better to use as few virtqueues as possible. So if a single piece of HW
>> supports both encoder and decoder functions, then it is better to have a
>> single virtual device, that provides both functions as well. The specific
>> function can be selected per stream then.
>> Is it OK to make changes to the reserved IDs?
>> Are there any other concerns?
>>
>> Thanks
> 
> For the new device usually, there is a new device id.
> May be you can explore how to merge the functionality using capabilities or feature bits to 
> a. either extend encoder to have additional decoder
> or
> b. extend decoded to have the encoder
> 
> and than the description can be changed.
> 
> Or 
> c. if the new device has major functionality and performance, may be its own.
> 
> I believe the details would be useful to find the suitable option from the 3 choices.

I don't understand option 3. Perhaps there are typos.
At the moment I think we'll choose option 1. Thanks!