[FFmpeg-cvslog] jpeg2000: merges quantization fixes from j2k
Michael Niedermayer
git at videolan.org
Thu May 30 15:04:15 CEST 2013
ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Thu May 30 14:34:33 2013 +0200| [09e03a84674f9b86415f47f09494a5730aae2a5f] | committer: Michael Niedermayer
jpeg2000: merges quantization fixes from j2k
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=09e03a84674f9b86415f47f09494a5730aae2a5f
---
libavcodec/jpeg2000.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/jpeg2000.c b/libavcodec/jpeg2000.c
index da74184..1610a21 100644
--- a/libavcodec/jpeg2000.c
+++ b/libavcodec/jpeg2000.c
@@ -273,12 +273,12 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
int numbps;
case JPEG2000_QSTY_NONE:
/* TODO: to verify. No quantization in this case */
- band->f_stepsize = (float) (1 << 13);
+ band->f_stepsize = 1;
break;
case JPEG2000_QSTY_SI:
/*TODO: Compute formula to implement. */
numbps = cbps +
- lut_gain[codsty->transform][bandno + (reslevelno > 0)];
+ lut_gain[codsty->transform == FF_DWT53][bandno + (reslevelno > 0)];
band->f_stepsize = (float)SHL(2048 + qntsty->mant[gbandno],
2 + numbps - qntsty->expn[gbandno]);
break;
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