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Simplify stereo rematrixing by only using one temporary variable. It is also

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about 1.8% faster on my system.

Originally committed as revision 20090 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2009-09-30 01:25:04 +00:00
parent 16c91d2b23
commit 2ed4439658
1 changed files with 3 additions and 5 deletions
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8
libavcodec/ac3dec.c
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@ -604,7 +604,6 @@ static void do_rematrixing(AC3DecodeContext *s)
{ {
int bnd, i; int bnd, i;
int end, bndend; int end, bndend;
int tmp0, tmp1;
end = FFMIN(s->end_freq[1], s->end_freq[2]); 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]) { if(s->rematrixing_flags[bnd]) {
bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd+1]); bndend = FFMIN(end, ff_ac3_rematrix_band_tab[bnd+1]);
for(; i<bndend; i++) { for(; i<bndend; i++) {
tmp0 = s->fixed_coeffs[1][i]; int tmp0 = s->fixed_coeffs[1][i];
tmp1 = s->fixed_coeffs[2][i]; s->fixed_coeffs[1][i] -= s->fixed_coeffs[2][i];
s->fixed_coeffs[1][i] = tmp0 + tmp1; s->fixed_coeffs[2][i] = tmp0 - s->fixed_coeffs[2][i];
s->fixed_coeffs[2][i] = tmp0 - tmp1;
} }
} }
} }