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dnxhddec: avoid a branch in 10-bit decode_dct_block()

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The minimum weight value is 32 so this test can be skipped for the
10-bit case.  Overall speedup 3-4%.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-07-22 00:13:27 +01:00
parent 406fbd24dc
commit b4cfb8254e
1 changed files with 1 additions and 1 deletions
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libavcodec/dnxhddec.c
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@ -239,7 +239,7 @@ static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
//av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
//av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weight %d\n", level, weight_matrix[i]);
level = (2*level+1) * qscale * weight_matrix[i];
if (weight_matrix[i] != level_bias)
if (level_bias < 32 || weight_matrix[i] != level_bias)
level += level_bias;
level >>= level_shift;