[FFmpeg-cvslog] jpeg2000: Speed up jpeg2000_decode_tile()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Mon Jul  1 10:01:33 2013 +0200| [53d5d89c1b7534205e5f825918701dda56d18896] | committer: Luca Barbato

jpeg2000: Speed up jpeg2000_decode_tile()

Skip processing bands with dimension set to 0.

Signed-off-by: Luca Barbato <lu_zero at gentoo.org>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=53d5d89c1b7534205e5f825918701dda56d18896
---

 libavcodec/jpeg2000dec.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 08c8c4d..6a300bd 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++) {