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j2kdec/jpeg2000dec: partially merge quantization code

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The quantization code needs more work, not so much work
merging but more work investigating what is correct.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
2013-05-28 14:27:49 +02:00
parent f0a2c8285a
commit 32475f56f3
7 changed files with 33 additions and 33 deletions
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libavcodec/jpeg2000.c
+3 -3
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@@ -288,15 +288,15 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
gain = cbps;
band->stepsize = pow(2.0, gain - qntsty->expn[gbandno]);
band->stepsize *= (float)qntsty->mant[gbandno] / 2048.0 + 1.0;
/* FIXME: In openjepg code stespize = stepsize * 0.5. Why?
* If not set output of entropic decoder is not correct. */
band->stepsize *= 0.5;
break;
default:
band->stepsize = 0;
av_log(avctx, AV_LOG_ERROR, "Unknown quantization format\n");
break;
}
/* FIXME: In openjepg code stespize = stepsize * 0.5. Why?
* If not set output of entropic decoder is not correct. */
band->stepsize *= 0.5;
/* BITEXACT computing case --> convert to int */
if (avctx->flags & CODEC_FLAG_BITEXACT)
band->stepsize = (int32_t)(band->stepsize * (1 << 16));