From 2ed4439658971fd238c02102bd24906aad4caf6b Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Wed, 30 Sep 2009 01:25:04 +0000 Subject: [PATCH] Simplify stereo rematrixing by only using one temporary variable. It is also about 1.8% faster on my system. Originally committed as revision 20090 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/ac3dec.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index dd97d116cd..91b82cfa7d 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -604,7 +604,6 @@ static void do_rematrixing(AC3DecodeContext *s) { int bnd, i; int end, bndend; - int tmp0, tmp1; end = FFMIN(s->end_freq[1], s->end_freq[2]); @@ -613,10 +612,9 @@ static void do_rematrixing(AC3DecodeContext *s) if(s->rematrixing_flags[bnd]) { bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd+1]); for(; ifixed_coeffs[1][i]; - tmp1 = s->fixed_coeffs[2][i]; - s->fixed_coeffs[1][i] = tmp0 + tmp1; - s->fixed_coeffs[2][i] = tmp0 - tmp1; + int tmp0 = s->fixed_coeffs[1][i]; + s->fixed_coeffs[1][i] -= s->fixed_coeffs[2][i]; + s->fixed_coeffs[2][i] = tmp0 - s->fixed_coeffs[2][i]; } } }