From 64e4af2ac19e7146080bf6aa2220cc2611943d1f Mon Sep 17 00:00:00 2001
From: Vitor Sessak <vitor1001@gmail.com>
Date: Thu, 25 Sep 2008 20:03:57 +0000
Subject: [PATCH] Do instead of divising a float by a constant, multiply by its
inverse
Originally committed as revision 15417 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/ra288.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c
index 11d5e4c6ec9..c4d430edafc 100644
--- a/libavcodec/ra288.c
+++ b/libavcodec/ra288.c
@@ -96,12 +96,12 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
/* block 48 of G.728 spec */
/* exp(sum * 0.1151292546497) == pow(10.0,sum/20) */
- sumsum = exp(sum * 0.1151292546497) * gain / (2048 * 4096);
+ sumsum = exp(sum * 0.1151292546497) * gain * (1.0/(1<<23));
for (i=0; i < 5; i++)
buffer[i] = codetable[cb_coef][i] * sumsum;
- sum = (4096 * 4096) * scalar_product_float(buffer, buffer, 5) / 5;
+ sum = scalar_product_float(buffer, buffer, 5) * ((1<<24)/5.);
sum = FFMAX(sum, 1);
--
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