[FFmpeg-devel] [PATCH 000/279] New channel layout API

[James Almer]

On 12/13/2021 8:36 PM, Nicolas George wrote:
> James Almer (12021-12-13):
>> To achieve this you don't need the same AVChannel value to appear several
>> times in the same layout. You have INT_MAX values available, so just assign
>> one to each of these you mentioned. No need for an abstract value "user
>> defined" that would then show up several times in a layout. Oboe can be 65,
>> piano can be 66.
>> Also, each channel is meant to map to a speaker in a different physical
>> location. If your idea is to have oboe and piano play through the same
> 
> The idea is that if some filters takes the oboe and piano from a single
> stream and extracts them into two streams, then the left and right will
> automatically be correctly marked left and right in the extracted
> streams.

Can't user defined names let you do that without the need to reuse the 
same AVChannel value in a given layout? And for that matter, can you not 
set said names within the filter itself and not in the layout?

> 
>> speaker, then you're thinking filtering, and that sounds beyond the scope of
>> a channel layout API.
> 
> Making sure existing filters and devices can flag the channel layout
> they need, which they could not because of the limitation of the current
> API, seems 100% in scope to me.
> 
> What is your definition of the scope of a channel layout API? I hope it
> is not "we did it that way, anything it cannot do is beyond the scope".

Mapping a channel (each of the data pointers in a frame) to an specific 
output, like a speaker.

> 
> Regards,
> 
> 
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