[FFmpeg-devel] [PATCH] Long-term prediction for ALS

[Stefano Sabatini]

On date Thursday 2009-11-12 19:12:52 +0100, Thilo Borgmann encoded:
> Michael Niedermayer schrieb:
> > On Thu, Nov 12, 2009 at 10:51:05AM -0500, Ronald S. Bultje wrote:
> >> Hi,
> >>
> >> On Thu, Nov 12, 2009 at 10:45 AM, Stefano Sabatini
> >> <stefano.sabatini-lala at poste.it> wrote:
> >>> On date Thursday 2009-11-12 16:37:04 +0100, Thilo Borgmann encoded:
> >>>> +    // set lag value for long-term prediction
> >>>> +    if      (avctx->sample_rate >= 192000)
> >>>> +        ctx->ltp_lag_length = 10;
> >>>> +    else if (avctx->sample_rate >=  96000)
> >>>> +        ctx->ltp_lag_length = 9;
> >>>> +    else
> >>>> +        ctx->ltp_lag_length = 8;
> >>>> +
> >>> Slightly simpler:
> >>>
> >>> ctx->ltp_lag_length = avctx->sample_rate >= 192000 ? 10 :
> >>>                      avctx->sample_rate >=  96000 ?  9 : 8;
> >> ltp_lag_length = 8 + samplerate >= 96000 + samplerate >= 192000;
> >> (might need brackets).
> > 
> > ltp_lag_length= 8 + FFMIN(samplerate/96000, 2);
> > 
> > if one wants the most compact source ...

Do as you want, but the last is a little too obfuscated...

Regards.
-- 
FFmpeg = Faboulous and Fiendish Mega Portable Ecletic Game