#include <string.h>
#include "libavutil/mathematics.h"
#include "fft.h"
+#include "fft-internal.h"
/* cos(2*pi*x/n) for 0<=x<=n/4, followed by its reverse */
#if !CONFIG_HARDCODED_TABLES
COSTABLE(32768);
COSTABLE(65536);
#endif
-COSTABLE_CONST FFTSample * const ff_cos_tabs[] = {
+COSTABLE_CONST FFTSample * const FFT_NAME(ff_cos_tabs)[] = {
NULL, NULL, NULL, NULL,
- ff_cos_16, ff_cos_32, ff_cos_64, ff_cos_128, ff_cos_256, ff_cos_512, ff_cos_1024,
- ff_cos_2048, ff_cos_4096, ff_cos_8192, ff_cos_16384, ff_cos_32768, ff_cos_65536,
+ FFT_NAME(ff_cos_16),
+ FFT_NAME(ff_cos_32),
+ FFT_NAME(ff_cos_64),
+ FFT_NAME(ff_cos_128),
+ FFT_NAME(ff_cos_256),
+ FFT_NAME(ff_cos_512),
+ FFT_NAME(ff_cos_1024),
+ FFT_NAME(ff_cos_2048),
+ FFT_NAME(ff_cos_4096),
+ FFT_NAME(ff_cos_8192),
+ FFT_NAME(ff_cos_16384),
+ FFT_NAME(ff_cos_32768),
+ FFT_NAME(ff_cos_65536),
};
static void ff_fft_permute_c(FFTContext *s, FFTComplex *z);
int i;
int m = 1<<index;
double freq = 2*M_PI/m;
- FFTSample *tab = ff_cos_tabs[index];
+ FFTSample *tab = FFT_NAME(ff_cos_tabs)[index];
for(i=0; i<=m/4; i++)
- tab[i] = cos(i*freq);
+ tab[i] = FIX15(cos(i*freq));
for(i=1; i<m/4; i++)
tab[m/2-i] = tab[i];
#endif
}
+static const int avx_tab[] = {
+ 0, 4, 1, 5, 8, 12, 9, 13, 2, 6, 3, 7, 10, 14, 11, 15
+};
+
+static int is_second_half_of_fft32(int i, int n)
+{
+ if (n <= 32)
+ return i >= 16;
+ else if (i < n/2)
+ return is_second_half_of_fft32(i, n/2);
+ else if (i < 3*n/4)
+ return is_second_half_of_fft32(i - n/2, n/4);
+ else
+ return is_second_half_of_fft32(i - 3*n/4, n/4);
+}
+
+static av_cold void fft_perm_avx(FFTContext *s)
+{
+ int i;
+ int n = 1 << s->nbits;
+
+ for (i = 0; i < n; i += 16) {
+ int k;
+ if (is_second_half_of_fft32(i, n)) {
+ for (k = 0; k < 16; k++)
+ s->revtab[-split_radix_permutation(i + k, n, s->inverse) & (n - 1)] =
+ i + avx_tab[k];
+
+ } else {
+ for (k = 0; k < 16; k++) {
+ int j = i + k;
+ j = (j & ~7) | ((j >> 1) & 3) | ((j << 2) & 4);
+ s->revtab[-split_radix_permutation(i + k, n, s->inverse) & (n - 1)] = j;
+ }
+ }
+ }
+}
+
av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
{
int i, j, n;
s->mdct_calc = ff_mdct_calc_c;
#endif
+#if CONFIG_FFT_FLOAT
if (ARCH_ARM) ff_fft_init_arm(s);
if (HAVE_ALTIVEC) ff_fft_init_altivec(s);
if (HAVE_MMX) ff_fft_init_mmx(s);
+ if (CONFIG_MDCT) s->mdct_calcw = s->mdct_calc;
+#else
+ if (CONFIG_MDCT) s->mdct_calcw = ff_mdct_calcw_c;
+ if (ARCH_ARM) ff_fft_fixed_init_arm(s);
+#endif
for(j=4; j<=nbits; j++) {
ff_init_ff_cos_tabs(j);
}
- for(i=0; i<n; i++) {
- int j = i;
- if (s->fft_permutation == FF_FFT_PERM_SWAP_LSBS)
- j = (j&~3) | ((j>>1)&1) | ((j<<1)&2);
- s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = j;
+
+ if (s->fft_permutation == FF_FFT_PERM_AVX) {
+ fft_perm_avx(s);
+ } else {
+ for(i=0; i<n; i++) {
+ int j = i;
+ if (s->fft_permutation == FF_FFT_PERM_SWAP_LSBS)
+ j = (j&~3) | ((j>>1)&1) | ((j<<1)&2);
+ s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = j;
+ }
}
return 0;
av_freep(&s->tmp_buf);
}
-#define sqrthalf (float)M_SQRT1_2
-
-#define BF(x,y,a,b) {\
- x = a - b;\
- y = a + b;\
-}
-
#define BUTTERFLIES(a0,a1,a2,a3) {\
BF(t3, t5, t5, t1);\
BF(a2.re, a0.re, a0.re, t5);\
}
#define TRANSFORM(a0,a1,a2,a3,wre,wim) {\
- t1 = a2.re * wre + a2.im * wim;\
- t2 = a2.im * wre - a2.re * wim;\
- t5 = a3.re * wre - a3.im * wim;\
- t6 = a3.im * wre + a3.re * wim;\
+ CMUL(t1, t2, a2.re, a2.im, wre, -wim);\
+ CMUL(t5, t6, a3.re, a3.im, wre, wim);\
BUTTERFLIES(a0,a1,a2,a3)\
}
#define PASS(name)\
static void name(FFTComplex *z, const FFTSample *wre, unsigned int n)\
{\
- FFTSample t1, t2, t3, t4, t5, t6;\
+ FFTDouble t1, t2, t3, t4, t5, t6;\
int o1 = 2*n;\
int o2 = 4*n;\
int o3 = 6*n;\
fft##n2(z);\
fft##n4(z+n4*2);\
fft##n4(z+n4*3);\
- pass(z,ff_cos_##n,n4/2);\
+ pass(z,FFT_NAME(ff_cos_##n),n4/2);\
}
static void fft4(FFTComplex *z)
{
- FFTSample t1, t2, t3, t4, t5, t6, t7, t8;
+ FFTDouble t1, t2, t3, t4, t5, t6, t7, t8;
BF(t3, t1, z[0].re, z[1].re);
BF(t8, t6, z[3].re, z[2].re);
static void fft8(FFTComplex *z)
{
- FFTSample t1, t2, t3, t4, t5, t6, t7, t8;
+ FFTDouble t1, t2, t3, t4, t5, t6;
fft4(z);
BF(t1, z[5].re, z[4].re, -z[5].re);
BF(t2, z[5].im, z[4].im, -z[5].im);
- BF(t3, z[7].re, z[6].re, -z[7].re);
- BF(t4, z[7].im, z[6].im, -z[7].im);
- BF(t8, t1, t3, t1);
- BF(t7, t2, t2, t4);
- BF(z[4].re, z[0].re, z[0].re, t1);
- BF(z[4].im, z[0].im, z[0].im, t2);
- BF(z[6].re, z[2].re, z[2].re, t7);
- BF(z[6].im, z[2].im, z[2].im, t8);
+ BF(t5, z[7].re, z[6].re, -z[7].re);
+ BF(t6, z[7].im, z[6].im, -z[7].im);
+ BUTTERFLIES(z[0],z[2],z[4],z[6]);
TRANSFORM(z[1],z[3],z[5],z[7],sqrthalf,sqrthalf);
}
#if !CONFIG_SMALL
static void fft16(FFTComplex *z)
{
- FFTSample t1, t2, t3, t4, t5, t6;
+ FFTDouble t1, t2, t3, t4, t5, t6;
+ FFTSample cos_16_1 = FFT_NAME(ff_cos_16)[1];
+ FFTSample cos_16_3 = FFT_NAME(ff_cos_16)[3];
fft8(z);
fft4(z+8);
TRANSFORM_ZERO(z[0],z[4],z[8],z[12]);
TRANSFORM(z[2],z[6],z[10],z[14],sqrthalf,sqrthalf);
- TRANSFORM(z[1],z[5],z[9],z[13],ff_cos_16[1],ff_cos_16[3]);
- TRANSFORM(z[3],z[7],z[11],z[15],ff_cos_16[3],ff_cos_16[1]);
+ TRANSFORM(z[1],z[5],z[9],z[13],cos_16_1,cos_16_3);
+ TRANSFORM(z[3],z[7],z[11],z[15],cos_16_3,cos_16_1);
}
#else
DECL_FFT(16,8,4)
{
fft_dispatch[s->nbits-2](z);
}
-
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