[FFmpeg-cvslog] dnxhddec: avoid a branch in 10-bit decode_dct_block()

[Mans Rullgard]

ffmpeg | branch: master | Mans Rullgard <mans at mansr.com> | Fri Jul 22 00:13:27 2011 +0100| [b4cfb8254eeeb2fc0aa2c0c36a5ede208af47a79] | committer: Mans Rullgard

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

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 at mansr.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b4cfb8254eeeb2fc0aa2c0c36a5ede208af47a79
---

 libavcodec/dnxhddec.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
index 426be2e..63ccd08 100644
--- a/libavcodec/dnxhddec.c
+++ b/libavcodec/dnxhddec.c
@@ -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;