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Code Issues Releases Activity

Get rid of fft_rev table, use ff_reverse and a shift.

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Reduces maximum allowed value for MDCT_NBITS to 10 (current value is 9)

Originally committed as revision 11519 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2008-01-13 08:33:00 +00:00
parent f952b30cd1
commit 99fac0806b
1 changed files with 1 additions and 11 deletions
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12
libavcodec/ac3enc.c
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@ -64,7 +64,6 @@ typedef struct AC3EncodeContext {
static int16_t costab[64];
static int16_t sintab[64];
static int16_t fft_rev[512];
static int16_t xcos1[128];
static int16_t xsin1[128];
@ -103,14 +102,6 @@ static void fft_init(int ln)
costab[i] = fix15(cos(alpha));
sintab[i] = fix15(sin(alpha));
}
for(i=0;i<n;i++) {
m=0;
for(j=0;j<ln;j++) {
m |= ((i >> j) & 1) << (ln-j-1);
}
fft_rev[i]=m;
}
}
/* butter fly op */
@ -148,8 +139,7 @@ static void fft(IComplex *z, int ln)
/* reverse */
for(j=0;j<np;j++) {
int k;
k = fft_rev[j];
int k = ff_reverse[j] >> (8 - ln);
if (k < j)
FFSWAP(IComplex, z[k], z[j]);
}