From 6da06ef6bbc01b713f67ffb94e7697eb2393ebe4 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Fri, 23 May 2014 21:59:04 +0200 Subject: [PATCH] avcodec/dcadec: make dca_dmix_code() 650% faster This effectively replaces the ldexpf() function call by a multiplication with a constant. Signed-off-by: Michael Niedermayer --- libavcodec/dcadec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavcodec/dcadec.c b/libavcodec/dcadec.c index 868e3b67b9..684294e8bf 100644 --- a/libavcodec/dcadec.c +++ b/libavcodec/dcadec.c @@ -2107,7 +2107,7 @@ static float dca_dmix_code(unsigned code) { int sign = (code >> 8) - 1; code &= 0xff; - return ldexpf((dca_dmixtable[code] ^ sign) - sign, -15); + return ((dca_dmixtable[code] ^ sign) - sign) * pow(2, -15); } /**