[FFmpeg-devel] [PATCH 2/3] lavfi/loudnorm: add an internal libebur128 library

Kyle Swanson k at ylo.ph
Fri Nov 11 04:51:34 EET 2016

On Thu, Nov 10, 2016 at 4:16 PM, Marton Balint <cus at passwd.hu> wrote:
> On Thu, 10 Nov 2016, Kyle Swanson wrote:
>> On Tue, Nov 8, 2016 at 9:39 AM, Kyle Swanson <k at ylo.ph> wrote:
>> These patches look good to me. If we're going to do this, we really
>> need to keep the true peak mode in the libebur128 port. This is a huge
>> part of the R128 spec, and it's important that it stays in. Of course
>> redundant code is bad, so we'll need to update f_ebur128 as well
>> (which has a true peak requirement.) I already have a patch for
>> f_ebur128. Marton, it might be easier for you to update the patch to
>> include true peak mode but I could do it as well. It'd be interesting
>> to benchmark the libebur128 FIR resampler vs. swresample.
> I'd rather push the patch as it is, then if you are interested, you can
> start working on true peak. OK?

Cool, patch is attached. Resampling here is done via libswresample.

> Since true peak calculation is so entirely different from loudness
> calculation, you might also create a separate API/Context for it. Just
> beacuse both loudness measurement and true peak is referenced in EBU R128
> recommendation, we don't necessarily have to use the same API for them. For
> example, for true peak measurement, you might want to specify the
> oversampling factor, but not the channel layout...
> Regards,
> Marton
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