From b4cfb8254eeeb2fc0aa2c0c36a5ede208af47a79 Mon Sep 17 00:00:00 2001
From: Mans Rullgard <mans@mansr.com>
Date: Fri, 22 Jul 2011 00:13:27 +0100
Subject: [PATCH] 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@mansr.com>
---
libavcodec/dnxhddec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
index 426be2e9857..63ccd08b48e 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;
--
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