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

[Nicolas George]

James Almer (12021-12-07):
> This is an updated and rebased version of the API that was sent to this mailing
> list about two years ago. It expands it with some new helpers, implements some
> changes that allows further extensibility for new features down the line, and
> finishes porting all missing modules and those introduced since 2019.

I see the concerns I raised last time have not been addressed:

(1) the ability to have a channel at a certain location several times;

(2) the ability to attach an arbitrary label to a channel or to a group
    of channels;

(3) an API and syntax for the user to specify a particular channel.

(1) is necessary for the amerge filter: merge two stereo streams, you
get two FL and two FR.

(1) is also necessary for devices that can record several sources
simultaneously. IIRC, that is the case for the BlackMagick devices. If
your devices records a band from two stereo and three mono microphones,
we need two FL, two FR and three FC.

(2) and (3) are necessary consequences of (1).

I also have concerns with the signature of av_channel_description():
this is level 0 of string manipulation, we need to get past this. I
should post again about this in a separate thread.

Regards,

-- 
  Nicolas George