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avfilter/ascale_template: improve slow tempo path output quality

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This commit is contained in:
Paul B Mahol 2024-10-14 14:35:42 +02:00
parent 98a7627b8b
commit 4d284553f8
1 changed files with 7 additions and 6 deletions
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13
libavfilter/ascale_template.c
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@ -167,7 +167,8 @@ static int fn(expand_samples)(AVFilterContext *ctx, const int ch)
int ns; int ns;
memset(rptrx+max_period, 0, (max_size+2-max_period) * sizeof(*rptrx)); memset(rptrx+max_period, 0, (max_size+2-max_period) * sizeof(*rptrx));
memcpy(rptrx, dptrx, max_period * sizeof(*rptrx)); for (int n = 0; n < max_period; n++)
rptrx[n] = dptrx[max_period-n-1];
memset(rptry+max_period, 0, (max_size+2-max_period) * sizeof(*rptry)); memset(rptry+max_period, 0, (max_size+2-max_period) * sizeof(*rptry));
memcpy(rptry, dptry, max_period * sizeof(*rptry)); memcpy(rptry, dptry, max_period * sizeof(*rptry));
@ -181,8 +182,8 @@ static int fn(expand_samples)(AVFilterContext *ctx, const int ch)
const ftype re1 = cptry[n].re; const ftype re1 = cptry[n].re;
const ftype im1 = cptry[n].im; const ftype im1 = cptry[n].im;
cptrx[n].re = re0*re1 + im1*im0; cptrx[n].re = re0*re1 - im1*im0;
cptrx[n].im = im0*re1 - im1*re0; cptrx[n].im = im0*re1 + im1*re0;
} }
c->c2r_fn(c->c2r, rptrx, cptrx, sizeof(*cptrx)); c->c2r_fn(c->c2r, rptrx, cptrx, sizeof(*cptrx));
@ -197,11 +198,11 @@ static int fn(expand_samples)(AVFilterContext *ctx, const int ch)
if (rptrx[n] >= rptrx[n-1] && if (rptrx[n] >= rptrx[n-1] &&
rptrx[n] >= rptrx[n+1]) { rptrx[n] >= rptrx[n+1]) {
const ftype xcorr = rptrx[n]; const ftype xcorr = rptrx[n];
const ftype score = fn(get_score)(xcorr, n); const ftype score = fn(get_score)(xcorr, max_period-n);
if (score > best_score) { if (score > best_score) {
best_score = score; best_score = score;
best_period = max_period-n; best_period = n+1;
} }
} }
} }
@ -210,7 +211,7 @@ static int fn(expand_samples)(AVFilterContext *ctx, const int ch)
const int n = max_period-best_period; const int n = max_period-best_period;
const ftype xx = fn(l2norm)(dptrx+n, best_period); const ftype xx = fn(l2norm)(dptrx+n, best_period);
const ftype yy = fn(l2norm)(dptry, best_period); const ftype yy = fn(l2norm)(dptry, best_period);
const ftype xy = rptrx[n]; const ftype xy = rptrx[best_period-1];
const ftype num = xy; const ftype num = xy;
const ftype den = xx * yy + EPS; const ftype den = xx * yy + EPS;