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avcodec/wmalosslessdec: simplify

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
zhaoxiu.zeng 2015-02-14 00:53:12 +08:00 committed by Michael Niedermayer
parent 80f1378005
commit 9e6198f0a4
1 changed files with 4 additions and 12 deletions
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14
libavcodec/wmalosslessdec.c
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@ -553,10 +553,7 @@ static int decode_channel_residues(WmallDecodeCtx *s, int ch, int tile_size)
s->ave_sum[ch] = residue + s->ave_sum[ch] -
(s->ave_sum[ch] >> s->movave_scaling);
if (residue & 1)
residue = -(residue >> 1) - 1;
else
residue = residue >> 1;
residue = (residue >> 1) ^ -(residue & 1);
s->channel_residues[ch][i] = residue;
}
@ -646,12 +643,8 @@ static void mclms_update(WmallDecodeCtx *s, int icoef, int *pred)
for (ich = num_channels - 1; ich >= 0; ich--) {
s->mclms_recent--;
s->mclms_prevvalues[s->mclms_recent] = s->channel_residues[ich][icoef];
if (s->channel_residues[ich][icoef] > range - 1)
s->mclms_prevvalues[s->mclms_recent] = range - 1;
else if (s->channel_residues[ich][icoef] < -range)
s->mclms_prevvalues[s->mclms_recent] = -range;
s->mclms_prevvalues[s->mclms_recent] = av_clip(s->channel_residues[ich][icoef],
-range, range - 1);
s->mclms_updates[s->mclms_recent] = WMASIGN(s->channel_residues[ich][icoef]);
}
@ -1073,7 +1066,6 @@ static int decode_frame(WmallDecodeCtx *s)
av_dlog(s->avctx, "Frame done\n");
if (s->skip_frame)
s->skip_frame = 0;
if (s->len_prefix) {