Round job start lines down to a multiple of 4. This means that if
filter_line3 exists then filter_line will not sometimes be called
once at the end of a slice depending on thread count. The final slice
may do up to 3 extra lines but filter_edge is faster than filter_line
so it is unlikely to create any noticable thread load variation.
Signed-off-by: John Cox <j...@kynesim.co.uk>
---
libavfilter/vf_bwdif.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/libavfilter/vf_bwdif.c b/libavfilter/vf_bwdif.c
index 52bc676cf8..6701208efe 100644
--- a/libavfilter/vf_bwdif.c
+++ b/libavfilter/vf_bwdif.c
@@ -237,6 +237,13 @@ static void filter_edge_16bit(void *dst1, void *prev1,
void *cur1, void *next1,
FILTER2()
}
+// Round job start line down to multiple of 4 so that if filter_line3 exists
+// and the frame is a multiple of 4 high then filter_line will never be called
+static inline int job_start(const int jobnr, const int nb_jobs, const int h)
+{
+ return jobnr >= nb_jobs ? h : ((h * jobnr) / nb_jobs) & ~3;
+}
+
static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int
nb_jobs)
{
BWDIFContext *s = ctx->priv;
@@ -246,8 +253,8 @@ static int filter_slice(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs)
int clip_max = (1 << (yadif->csp->comp[td->plane].depth)) - 1;
int df = (yadif->csp->comp[td->plane].depth + 7) / 8;
int refs = linesize / df;
- int slice_start = (td->h * jobnr ) / nb_jobs;
- int slice_end = (td->h * (jobnr+1)) / nb_jobs;
+ int slice_start = job_start(jobnr, nb_jobs, td->h);
+ int slice_end = job_start(jobnr + 1, nb_jobs, td->h);
int y;
for (y = slice_start; y < slice_end; y++) {
@@ -310,7 +317,7 @@ static void filter(AVFilterContext *ctx, AVFrame *dstpic,
td.plane = i;
ff_filter_execute(ctx, filter_slice, &td, NULL,
- FFMIN(h, ff_filter_get_nb_threads(ctx)));
+ FFMIN((h+3)/4, ff_filter_get_nb_threads(ctx)));
}
if (yadif->current_field == YADIF_FIELD_END) {
yadif->current_field = YADIF_FIELD_NORMAL;
--
2.39.2
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