From b6c77581683c9ed0b5a72e2b598291162d12cf4b Mon Sep 17 00:00:00 2001
From: Vitor Sessak <vitor1001@gmail.com>
Date: Wed, 24 Sep 2008 20:31:24 +0000
Subject: [PATCH] Move constant multiplication out of the loop
Originally committed as revision 15404 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/ra288.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c
index 3993c342eae..11d5e4c6ec9 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.;
+ sumsum = exp(sum * 0.1151292546497) * gain / (2048 * 4096);
for (i=0; i < 5; i++)
buffer[i] = codetable[cb_coef][i] * sumsum;
- sum = scalar_product_float(buffer, buffer, 5) / 5;
+ sum = (4096 * 4096) * scalar_product_float(buffer, buffer, 5) / 5;
sum = FFMAX(sum, 1);
@@ -118,7 +118,7 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
/* output */
for (i=0; i < 5; i++)
- block[i] = av_clipf(block[i], -4095, 4095);
+ block[i] = av_clipf(block[i], -4095./4096., 4095./4096.);
}
/**
@@ -210,7 +210,7 @@ static int ra288_decode_frame(AVCodecContext * avctx, void *data,
decode(ractx, gain, cb_coef);
for (j=0; j < 5; j++)
- *(out++) = (1/4096.) * ractx->sp_hist[70 + 36 + j];
+ *(out++) = ractx->sp_hist[70 + 36 + j];
if ((i & 7) == 3)
backward_filter(ractx);
--
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