+ FILTER(w - 3, w, 0)
+}
+
+static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ YADIFContext *s = ctx->priv;
+ ThreadData *td = arg;
+ int refs = s->cur->linesize[td->plane];
+ int df = (s->csp->comp[td->plane].depth + 7) / 8;
+ int pix_3 = 3 * df;
+ int slice_h = td->h / nb_jobs;
+ int slice_start = jobnr * slice_h;
+ int slice_end = (jobnr == nb_jobs - 1) ? td->h : (jobnr + 1) * slice_h;
+ int y;
+
+ /* filtering reads 3 pixels to the left/right; to avoid invalid reads,
+ * we need to call the c variant which avoids this for border pixels
+ */
+ for (y = slice_start; y < slice_end; y++) {
+ if ((y ^ td->parity) & 1) {
+ uint8_t *prev = &s->prev->data[td->plane][y * refs];
+ uint8_t *cur = &s->cur ->data[td->plane][y * refs];
+ uint8_t *next = &s->next->data[td->plane][y * refs];
+ uint8_t *dst = &td->frame->data[td->plane][y * td->frame->linesize[td->plane]];
+ int mode = y == 1 || y + 2 == td->h ? 2 : s->mode;
+ s->filter_line(dst + pix_3, prev + pix_3, cur + pix_3,
+ next + pix_3, td->w - 6,
+ y + 1 < td->h ? refs : -refs,
+ y ? -refs : refs,
+ td->parity ^ td->tff, mode);
+ s->filter_edges(dst, prev, cur, next, td->w,
+ y + 1 < td->h ? refs : -refs,
+ y ? -refs : refs,
+ td->parity ^ td->tff, mode);
+ } else {
+ memcpy(&td->frame->data[td->plane][y * td->frame->linesize[td->plane]],
+ &s->cur->data[td->plane][y * refs], td->w * df);
+ }
+ }
+ return 0;