From 64e4af2ac19e7146080bf6aa2220cc2611943d1f Mon Sep 17 00:00:00 2001 From: Vitor Sessak 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 11d5e4c6ec..c4d430edaf 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);