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avcodec/mpeg4video: Reorder operations to reduce accesses to err_recognition 

About 9 cpu cycle faster mpeg4_decode_mb()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-05-24 15:03:45 +02:00
parent b71528d896
commit 39de31ccb6
1 changed files with 5 additions and 5 deletions
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10
libavcodec/mpeg4video.h
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@ -230,21 +230,21 @@ static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
} else {
level += pred;
ret = level;
if (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) {
}
level *= scale;
if (level & (~2047)) {
if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
if (level < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"dc<0 at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
if (level * scale > 2048 + scale) {
if (level > 2048 + scale) {
av_log(s->avctx, AV_LOG_ERROR,
"dc overflow at %dx%d\n", s->mb_x, s->mb_y);
return -1;
}
}
}
level *= scale;
if (level & (~2047)) {
if (level < 0)
level = 0;
else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))