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Write results of post-rotation complex multiply directly to output. 

2% faster in function mdct512().

Originally committed as revision 26028 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-12-16 03:13:45 +00:00
parent 9d8533368f
commit e29065f7bf
1 changed files with 2 additions and 4 deletions
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6
libavcodec/ac3enc.c
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@ -332,7 +332,7 @@ static void fft(IComplex *z, int ln)
*/
static void mdct512(int32_t *out, int16_t *in)
{
int i, re, im, re1, im1;
int i, re, im;
int16_t rot[MDCT_SAMPLES];
IComplex x[MDCT_SAMPLES/4];
@ -354,9 +354,7 @@ static void mdct512(int32_t *out, int16_t *in)
for (i = 0; i < MDCT_SAMPLES/4; i++) {
re = x[i].re;
im = x[i].im;
CMUL(re1, im1, re, im, xsin1[i], xcos1[i]);
out[ 2*i] = im1;
out[MDCT_SAMPLES/2-1-2*i] = re1;
CMUL(out[MDCT_SAMPLES/2-1-2*i], out[2*i], re, im, xsin1[i], xcos1[i]);
}
}