From 53d5d89c1b7534205e5f825918701dda56d18896 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Mon, 1 Jul 2013 10:01:33 +0200
Subject: [PATCH] jpeg2000: Speed up jpeg2000_decode_tile()
Skip processing bands with dimension set to 0.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
---
libavcodec/jpeg2000dec.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 08c8c4df979..6a300bd8f5d 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1118,6 +1118,10 @@ static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
int cblkno = 0, bandpos;
bandpos = bandno + (reslevelno > 0);
+ if (band->coord[0][0] == band->coord[0][1] ||
+ band->coord[1][0] == band->coord[1][1])
+ continue;
+
nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y;
/* Loop on precincts */
for (precno = 0; precno < nb_precincts; precno++) {
--
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