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Quant changes only once per MB so move the corresponding scale factor assignment

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out of the block decoding loop. Indeo4 doesn't use any scale table but the quant
level itself as scale. Therefore access scale table only if its pointer != NULL.

Originally committed as revision 23569 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Maxim Poliakovski 2010-06-10 17:31:12 +00:00
parent c1b85795cb
commit 79d46cbea6
1 changed files with 3 additions and 1 deletions
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4
libavcodec/ivi_common.c
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@ -364,6 +364,8 @@ int ff_ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile)
base_tab = is_intra ? band->intra_base : band->inter_base;
scale_tab = is_intra ? band->intra_scale : band->inter_scale;
if (scale_tab)
quant = scale_tab[quant];
if (!is_intra) {
mv_x = mb->mv_x;
@ -415,7 +417,7 @@ int ff_ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile)
if (IVI_DEBUG && !val)
av_log(NULL, AV_LOG_ERROR, "Val = 0 encountered!\n");
q = (base_tab[pos] * scale_tab[quant]) >> 9;
q = (base_tab[pos] * quant) >> 9;
if (q > 1)
val = val * q + FFSIGN(val) * (((q ^ 1) - 1) >> 1);
trvec[pos] = val;