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libavfilter: improve atempo audio quality

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Reduce audio fragment alignment jitter by penalizing alignment
correction offsets that deviate too much from the target offset.
This is accomplished by multiplying the cross correlation search
window with a quadratic function.

Signed-off-by: Pavel Koshevoy <pavel@homestead.aragog.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Pavel Koshevoy 2012-06-17 16:45:26 -06:00 committed by Michael Niedermayer
parent 08613d50d6
commit 5fa8226420
1 changed files with 1 additions and 1 deletions
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libavfilter/af_atempo.c
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@ -654,7 +654,7 @@ static int yae_align(AudioFragment *frag,
// normalize: // normalize:
FFTSample drifti = (FFTSample)(drift + i); FFTSample drifti = (FFTSample)(drift + i);
metric *= drifti; metric *= drifti * (FFTSample)(i - i0) * (FFTSample)(i1 - i);
if (metric > best_metric) { if (metric > best_metric) {
best_metric = metric; best_metric = metric;