This patch is more informal, there's probably a better way to bump
performance up above 50 fps. This is for the smoke_sauna sample on
SVT's FTP by the way.
From 103c38adabae39a607049ef517de43f4d2f9d406 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomas=20H=C3=A4rdin?= <g...@haerdin.se>
Date: Tue, 14 Jun 2022 11:19:06 +0200
Subject: [PATCH 10/11] lavc/jpeg2000dec: Use coarser slicing for initial
reslevels
This brings -lowres 2 lossless 4K J2K on an AMD EPYC 7R32 to 52 fps (2080% CPU).
---
libavcodec/jpeg2000dec.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 46f7d841b5..71176d944d 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -2673,9 +2673,19 @@ static int jpeg2000_decode_frame(AVCodecContext *avctx, AVFrame *picture,
for (s->reslevel = 0; s->reslevel < maxreslevels; s->reslevel++) {
for (s->dir = 0; s->dir < 2; s->dir++) {
+ int before = s->slices;
+ int div = s->slices >= 96 ? 7 : 5;
+
+ if (s->reslevel < div) {
+ int halve = 1<<(div - s->reslevel + (s->slices >= 96 ? 0 : 1 - s->dir));
+ s->slices = (s->slices + halve-1)/halve;
+ }
+
if ((ret = avctx->execute2(avctx, jpeg2000_idwt, NULL, NULL,
s->numXtiles * s->numYtiles * s->ncomponents * s->slices)) < 0)
goto end;
+
+ s->slices = before;
}
}
--
2.30.2
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