From 6b2636bba68880450749b3d36a99d584c031342e Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Fri, 15 Apr 2011 19:51:06 -0400 Subject: ac3enc: simplify exponent_init() by calculating exponent_group_tab[] based on exponent group sizes. --- libavcodec/ac3enc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'libavcodec/ac3enc.c') diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c index 55f065bda1..f8136327fb 100644 --- a/libavcodec/ac3enc.c +++ b/libavcodec/ac3enc.c @@ -521,11 +521,13 @@ static void apply_rematrixing(AC3EncodeContext *s) */ static av_cold void exponent_init(AC3EncodeContext *s) { - int i; - for (i = 73; i < 256; i++) { - exponent_group_tab[0][i] = (i - 1) / 3; - exponent_group_tab[1][i] = (i + 2) / 6; - exponent_group_tab[2][i] = (i + 8) / 12; + int expstr, i, grpsize; + + for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) { + grpsize = 3 << expstr; + for (i = 73; i < 256; i++) { + exponent_group_tab[expstr][i] = (i + grpsize - 4) / grpsize; + } } /* LFE */ exponent_group_tab[0][7] = 2; -- cgit v1.2.3