[FFmpeg-devel] [PATCH] avfilter: add audio surround upmixer

Paul B Mahol onemda at gmail.com
Fri May 26 19:54:33 EEST 2017

On 5/26/17, Michael Niedermayer <michael at niedermayer.cc> wrote:
> On Fri, May 26, 2017 at 01:11:38PM +0200, Paul B Mahol wrote:
>> On 5/26/17, Nicolas George <george at nsup.org> wrote:
>> > Le septidi 7 prairial, an CCXXV, Paul B Mahol a ecrit :
>> >> > This belongs in libswresample
>> >> No it does not.
>> >
>> > I think it does too.
>> You want to link libswresample with libavcodec?
> While this question was directed at nicolas ...
> I dont think audio upmix code should depend on a lib of encoders and
> decoders (libavcodec)
> No matter if the upmix code would be in libavfilter or libswresample
> I belive a temporary dependancy would be ok, if there is intend to
> factor/move things to remove the dependancy in the future.
> But IMO libavcodec is the wrong place to export generic FFT
> functionality.
> We need FFTs in codecs, we need them in filters, we need them in
> swresample (the soxr resampler we support also uses a FFT internally)
> Also moving FFT to a different lib should be quite easy compared to
> other ugly dependancies we have (as in snow motion estimation, which
> is not as easy to move. none the less none of these ugly dependancies
> should be there except temporary)

This code does upmixing, and there could by myriad variants of upmixing.

Having it in libswresample is flawed design.

So I will not do the transitions.

If you still object to leave it as it is, in lavfi. You will need to take
care of the necessary changes by yourself.

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