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-rw-r--r--media/ffvpx/libavcodec/fft_template.c639
1 files changed, 639 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/fft_template.c b/media/ffvpx/libavcodec/fft_template.c
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+++ b/media/ffvpx/libavcodec/fft_template.c
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+/*
+ * FFT/IFFT transforms
+ * Copyright (c) 2008 Loren Merritt
+ * Copyright (c) 2002 Fabrice Bellard
+ * Partly based on libdjbfft by D. J. Bernstein
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * FFT/IFFT transforms.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "libavutil/mathematics.h"
+#include "libavutil/thread.h"
+#include "fft.h"
+#include "fft-internal.h"
+
+#if FFT_FIXED_32
+#include "fft_table.h"
+
+static void av_cold fft_lut_init(void)
+{
+ int n = 0;
+ ff_fft_lut_init(ff_fft_offsets_lut, 0, 1 << 17, &n);
+}
+
+#else /* FFT_FIXED_32 */
+
+/* cos(2*pi*x/n) for 0<=x<=n/4, followed by its reverse */
+#if !CONFIG_HARDCODED_TABLES
+COSTABLE(16);
+COSTABLE(32);
+COSTABLE(64);
+COSTABLE(128);
+COSTABLE(256);
+COSTABLE(512);
+COSTABLE(1024);
+COSTABLE(2048);
+COSTABLE(4096);
+COSTABLE(8192);
+COSTABLE(16384);
+COSTABLE(32768);
+COSTABLE(65536);
+COSTABLE(131072);
+
+static av_cold void init_ff_cos_tabs(int index)
+{
+ int i;
+ int m = 1<<index;
+ double freq = 2*M_PI/m;
+ FFTSample *tab = FFT_NAME(ff_cos_tabs)[index];
+ for(i=0; i<=m/4; i++)
+ tab[i] = FIX15(cos(i*freq));
+ for(i=1; i<m/4; i++)
+ tab[m/2-i] = tab[i];
+}
+
+typedef struct CosTabsInitOnce {
+ void (*func)(void);
+ AVOnce control;
+} CosTabsInitOnce;
+
+#define INIT_FF_COS_TABS_FUNC(index, size) \
+static av_cold void init_ff_cos_tabs_ ## size (void)\
+{ \
+ init_ff_cos_tabs(index); \
+}
+
+INIT_FF_COS_TABS_FUNC(4, 16)
+INIT_FF_COS_TABS_FUNC(5, 32)
+INIT_FF_COS_TABS_FUNC(6, 64)
+INIT_FF_COS_TABS_FUNC(7, 128)
+INIT_FF_COS_TABS_FUNC(8, 256)
+INIT_FF_COS_TABS_FUNC(9, 512)
+INIT_FF_COS_TABS_FUNC(10, 1024)
+INIT_FF_COS_TABS_FUNC(11, 2048)
+INIT_FF_COS_TABS_FUNC(12, 4096)
+INIT_FF_COS_TABS_FUNC(13, 8192)
+INIT_FF_COS_TABS_FUNC(14, 16384)
+INIT_FF_COS_TABS_FUNC(15, 32768)
+INIT_FF_COS_TABS_FUNC(16, 65536)
+INIT_FF_COS_TABS_FUNC(17, 131072)
+
+static CosTabsInitOnce cos_tabs_init_once[] = {
+ { NULL },
+ { NULL },
+ { NULL },
+ { NULL },
+ { init_ff_cos_tabs_16, AV_ONCE_INIT },
+ { init_ff_cos_tabs_32, AV_ONCE_INIT },
+ { init_ff_cos_tabs_64, AV_ONCE_INIT },
+ { init_ff_cos_tabs_128, AV_ONCE_INIT },
+ { init_ff_cos_tabs_256, AV_ONCE_INIT },
+ { init_ff_cos_tabs_512, AV_ONCE_INIT },
+ { init_ff_cos_tabs_1024, AV_ONCE_INIT },
+ { init_ff_cos_tabs_2048, AV_ONCE_INIT },
+ { init_ff_cos_tabs_4096, AV_ONCE_INIT },
+ { init_ff_cos_tabs_8192, AV_ONCE_INIT },
+ { init_ff_cos_tabs_16384, AV_ONCE_INIT },
+ { init_ff_cos_tabs_32768, AV_ONCE_INIT },
+ { init_ff_cos_tabs_65536, AV_ONCE_INIT },
+ { init_ff_cos_tabs_131072, AV_ONCE_INIT },
+};
+
+#endif
+COSTABLE_CONST FFTSample * const FFT_NAME(ff_cos_tabs)[] = {
+ NULL, NULL, NULL, NULL,
+ 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),
+ FFT_NAME(ff_cos_131072),
+};
+
+#endif /* FFT_FIXED_32 */
+
+static void fft_permute_c(FFTContext *s, FFTComplex *z);
+static void fft_calc_c(FFTContext *s, FFTComplex *z);
+
+static int split_radix_permutation(int i, int n, int inverse)
+{
+ int m;
+ if(n <= 2) return i&1;
+ m = n >> 1;
+ if(!(i&m)) return split_radix_permutation(i, m, inverse)*2;
+ m >>= 1;
+ if(inverse == !(i&m)) return split_radix_permutation(i, m, inverse)*4 + 1;
+ else return split_radix_permutation(i, m, inverse)*4 - 1;
+}
+
+av_cold void ff_init_ff_cos_tabs(int index)
+{
+#if (!CONFIG_HARDCODED_TABLES) && (!FFT_FIXED_32)
+ ff_thread_once(&cos_tabs_init_once[index].control, cos_tabs_init_once[index].func);
+#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->revtab = NULL;
+ s->revtab32 = NULL;
+
+ if (nbits < 2 || nbits > 17)
+ goto fail;
+ s->nbits = nbits;
+ n = 1 << nbits;
+
+ if (nbits <= 16) {
+ s->revtab = av_malloc(n * sizeof(uint16_t));
+ if (!s->revtab)
+ goto fail;
+ } else {
+ s->revtab32 = av_malloc(n * sizeof(uint32_t));
+ if (!s->revtab32)
+ goto fail;
+ }
+ s->tmp_buf = av_malloc(n * sizeof(FFTComplex));
+ if (!s->tmp_buf)
+ goto fail;
+ s->inverse = inverse;
+ s->fft_permutation = FF_FFT_PERM_DEFAULT;
+
+ s->fft_permute = fft_permute_c;
+ s->fft_calc = fft_calc_c;
+#if CONFIG_MDCT
+ s->imdct_calc = ff_imdct_calc_c;
+ s->imdct_half = ff_imdct_half_c;
+ s->mdct_calc = ff_mdct_calc_c;
+#endif
+
+#if FFT_FIXED_32
+ {
+ static AVOnce control = AV_ONCE_INIT;
+ ff_thread_once(&control, fft_lut_init);
+ }
+#else /* FFT_FIXED_32 */
+#if FFT_FLOAT
+ if (ARCH_AARCH64) ff_fft_init_aarch64(s);
+ if (ARCH_ARM) ff_fft_init_arm(s);
+ if (ARCH_PPC) ff_fft_init_ppc(s);
+ if (ARCH_X86) ff_fft_init_x86(s);
+ if (CONFIG_MDCT) s->mdct_calcw = s->mdct_calc;
+ if (HAVE_MIPSFPU) ff_fft_init_mips(s);
+#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);
+ }
+#endif /* FFT_FIXED_32 */
+
+
+ if (s->fft_permutation == FF_FFT_PERM_AVX) {
+ fft_perm_avx(s);
+ } else {
+#define PROCESS_FFT_PERM_SWAP_LSBS(num) do {\
+ for(i = 0; i < n; i++) {\
+ int k;\
+ j = i;\
+ j = (j & ~3) | ((j >> 1) & 1) | ((j << 1) & 2);\
+ k = -split_radix_permutation(i, n, s->inverse) & (n - 1);\
+ s->revtab##num[k] = j;\
+ } \
+} while(0);
+
+#define PROCESS_FFT_PERM_DEFAULT(num) do {\
+ for(i = 0; i < n; i++) {\
+ int k;\
+ j = i;\
+ k = -split_radix_permutation(i, n, s->inverse) & (n - 1);\
+ s->revtab##num[k] = j;\
+ } \
+} while(0);
+
+#define SPLIT_RADIX_PERMUTATION(num) do { \
+ if (s->fft_permutation == FF_FFT_PERM_SWAP_LSBS) {\
+ PROCESS_FFT_PERM_SWAP_LSBS(num) \
+ } else {\
+ PROCESS_FFT_PERM_DEFAULT(num) \
+ }\
+} while(0);
+
+ if (s->revtab)
+ SPLIT_RADIX_PERMUTATION()
+ if (s->revtab32)
+ SPLIT_RADIX_PERMUTATION(32)
+
+#undef PROCESS_FFT_PERM_DEFAULT
+#undef PROCESS_FFT_PERM_SWAP_LSBS
+#undef SPLIT_RADIX_PERMUTATION
+ }
+
+ return 0;
+ fail:
+ av_freep(&s->revtab);
+ av_freep(&s->revtab32);
+ av_freep(&s->tmp_buf);
+ return -1;
+}
+
+static void fft_permute_c(FFTContext *s, FFTComplex *z)
+{
+ int j, np;
+ const uint16_t *revtab = s->revtab;
+ const uint32_t *revtab32 = s->revtab32;
+ np = 1 << s->nbits;
+ /* TODO: handle split-radix permute in a more optimal way, probably in-place */
+ if (revtab) {
+ for(j=0;j<np;j++) s->tmp_buf[revtab[j]] = z[j];
+ } else
+ for(j=0;j<np;j++) s->tmp_buf[revtab32[j]] = z[j];
+
+ memcpy(z, s->tmp_buf, np * sizeof(FFTComplex));
+}
+
+av_cold void ff_fft_end(FFTContext *s)
+{
+ av_freep(&s->revtab);
+ av_freep(&s->revtab32);
+ av_freep(&s->tmp_buf);
+}
+
+#if FFT_FIXED_32
+
+static void fft_calc_c(FFTContext *s, FFTComplex *z) {
+
+ int nbits, i, n, num_transforms, offset, step;
+ int n4, n2, n34;
+ unsigned tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
+ FFTComplex *tmpz;
+ const int fft_size = (1 << s->nbits);
+ int64_t accu;
+
+ num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
+
+ for (n=0; n<num_transforms; n++){
+ offset = ff_fft_offsets_lut[n] << 2;
+ tmpz = z + offset;
+
+ tmp1 = tmpz[0].re + (unsigned)tmpz[1].re;
+ tmp5 = tmpz[2].re + (unsigned)tmpz[3].re;
+ tmp2 = tmpz[0].im + (unsigned)tmpz[1].im;
+ tmp6 = tmpz[2].im + (unsigned)tmpz[3].im;
+ tmp3 = tmpz[0].re - (unsigned)tmpz[1].re;
+ tmp8 = tmpz[2].im - (unsigned)tmpz[3].im;
+ tmp4 = tmpz[0].im - (unsigned)tmpz[1].im;
+ tmp7 = tmpz[2].re - (unsigned)tmpz[3].re;
+
+ tmpz[0].re = tmp1 + tmp5;
+ tmpz[2].re = tmp1 - tmp5;
+ tmpz[0].im = tmp2 + tmp6;
+ tmpz[2].im = tmp2 - tmp6;
+ tmpz[1].re = tmp3 + tmp8;
+ tmpz[3].re = tmp3 - tmp8;
+ tmpz[1].im = tmp4 - tmp7;
+ tmpz[3].im = tmp4 + tmp7;
+ }
+
+ if (fft_size < 8)
+ return;
+
+ num_transforms = (num_transforms >> 1) | 1;
+
+ for (n=0; n<num_transforms; n++){
+ offset = ff_fft_offsets_lut[n] << 3;
+ tmpz = z + offset;
+
+ tmp1 = tmpz[4].re + (unsigned)tmpz[5].re;
+ tmp3 = tmpz[6].re + (unsigned)tmpz[7].re;
+ tmp2 = tmpz[4].im + (unsigned)tmpz[5].im;
+ tmp4 = tmpz[6].im + (unsigned)tmpz[7].im;
+ tmp5 = tmp1 + tmp3;
+ tmp7 = tmp1 - tmp3;
+ tmp6 = tmp2 + tmp4;
+ tmp8 = tmp2 - tmp4;
+
+ tmp1 = tmpz[4].re - (unsigned)tmpz[5].re;
+ tmp2 = tmpz[4].im - (unsigned)tmpz[5].im;
+ tmp3 = tmpz[6].re - (unsigned)tmpz[7].re;
+ tmp4 = tmpz[6].im - (unsigned)tmpz[7].im;
+
+ tmpz[4].re = tmpz[0].re - tmp5;
+ tmpz[0].re = tmpz[0].re + tmp5;
+ tmpz[4].im = tmpz[0].im - tmp6;
+ tmpz[0].im = tmpz[0].im + tmp6;
+ tmpz[6].re = tmpz[2].re - tmp8;
+ tmpz[2].re = tmpz[2].re + tmp8;
+ tmpz[6].im = tmpz[2].im + tmp7;
+ tmpz[2].im = tmpz[2].im - tmp7;
+
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp1 + tmp2);
+ tmp5 = (int32_t)((accu + 0x40000000) >> 31);
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp3 - tmp4);
+ tmp7 = (int32_t)((accu + 0x40000000) >> 31);
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp2 - tmp1);
+ tmp6 = (int32_t)((accu + 0x40000000) >> 31);
+ accu = (int64_t)Q31(M_SQRT1_2)*(int)(tmp3 + tmp4);
+ tmp8 = (int32_t)((accu + 0x40000000) >> 31);
+ tmp1 = tmp5 + tmp7;
+ tmp3 = tmp5 - tmp7;
+ tmp2 = tmp6 + tmp8;
+ tmp4 = tmp6 - tmp8;
+
+ tmpz[5].re = tmpz[1].re - tmp1;
+ tmpz[1].re = tmpz[1].re + tmp1;
+ tmpz[5].im = tmpz[1].im - tmp2;
+ tmpz[1].im = tmpz[1].im + tmp2;
+ tmpz[7].re = tmpz[3].re - tmp4;
+ tmpz[3].re = tmpz[3].re + tmp4;
+ tmpz[7].im = tmpz[3].im + tmp3;
+ tmpz[3].im = tmpz[3].im - tmp3;
+ }
+
+ step = 1 << ((MAX_LOG2_NFFT-4) - 4);
+ n4 = 4;
+
+ for (nbits=4; nbits<=s->nbits; nbits++){
+ n2 = 2*n4;
+ n34 = 3*n4;
+ num_transforms = (num_transforms >> 1) | 1;
+
+ for (n=0; n<num_transforms; n++){
+ const FFTSample *w_re_ptr = ff_w_tab_sr + step;
+ const FFTSample *w_im_ptr = ff_w_tab_sr + MAX_FFT_SIZE/(4*16) - step;
+ offset = ff_fft_offsets_lut[n] << nbits;
+ tmpz = z + offset;
+
+ tmp5 = tmpz[ n2].re + (unsigned)tmpz[n34].re;
+ tmp1 = tmpz[ n2].re - (unsigned)tmpz[n34].re;
+ tmp6 = tmpz[ n2].im + (unsigned)tmpz[n34].im;
+ tmp2 = tmpz[ n2].im - (unsigned)tmpz[n34].im;
+
+ tmpz[ n2].re = tmpz[ 0].re - tmp5;
+ tmpz[ 0].re = tmpz[ 0].re + tmp5;
+ tmpz[ n2].im = tmpz[ 0].im - tmp6;
+ tmpz[ 0].im = tmpz[ 0].im + tmp6;
+ tmpz[n34].re = tmpz[n4].re - tmp2;
+ tmpz[ n4].re = tmpz[n4].re + tmp2;
+ tmpz[n34].im = tmpz[n4].im + tmp1;
+ tmpz[ n4].im = tmpz[n4].im - tmp1;
+
+ for (i=1; i<n4; i++){
+ FFTSample w_re = w_re_ptr[0];
+ FFTSample w_im = w_im_ptr[0];
+ accu = (int64_t)w_re*tmpz[ n2+i].re;
+ accu += (int64_t)w_im*tmpz[ n2+i].im;
+ tmp1 = (int32_t)((accu + 0x40000000) >> 31);
+ accu = (int64_t)w_re*tmpz[ n2+i].im;
+ accu -= (int64_t)w_im*tmpz[ n2+i].re;
+ tmp2 = (int32_t)((accu + 0x40000000) >> 31);
+ accu = (int64_t)w_re*tmpz[n34+i].re;
+ accu -= (int64_t)w_im*tmpz[n34+i].im;
+ tmp3 = (int32_t)((accu + 0x40000000) >> 31);
+ accu = (int64_t)w_re*tmpz[n34+i].im;
+ accu += (int64_t)w_im*tmpz[n34+i].re;
+ tmp4 = (int32_t)((accu + 0x40000000) >> 31);
+
+ tmp5 = tmp1 + tmp3;
+ tmp1 = tmp1 - tmp3;
+ tmp6 = tmp2 + tmp4;
+ tmp2 = tmp2 - tmp4;
+
+ tmpz[ n2+i].re = tmpz[ i].re - tmp5;
+ tmpz[ i].re = tmpz[ i].re + tmp5;
+ tmpz[ n2+i].im = tmpz[ i].im - tmp6;
+ tmpz[ i].im = tmpz[ i].im + tmp6;
+ tmpz[n34+i].re = tmpz[n4+i].re - tmp2;
+ tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;
+ tmpz[n34+i].im = tmpz[n4+i].im + tmp1;
+ tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;
+
+ w_re_ptr += step;
+ w_im_ptr -= step;
+ }
+ }
+ step >>= 1;
+ n4 <<= 1;
+ }
+}
+
+#else /* FFT_FIXED_32 */
+
+#define BUTTERFLIES(a0,a1,a2,a3) {\
+ BF(t3, t5, t5, t1);\
+ BF(a2.re, a0.re, a0.re, t5);\
+ BF(a3.im, a1.im, a1.im, t3);\
+ BF(t4, t6, t2, t6);\
+ BF(a3.re, a1.re, a1.re, t4);\
+ BF(a2.im, a0.im, a0.im, t6);\
+}
+
+// force loading all the inputs before storing any.
+// this is slightly slower for small data, but avoids store->load aliasing
+// for addresses separated by large powers of 2.
+#define BUTTERFLIES_BIG(a0,a1,a2,a3) {\
+ FFTSample r0=a0.re, i0=a0.im, r1=a1.re, i1=a1.im;\
+ BF(t3, t5, t5, t1);\
+ BF(a2.re, a0.re, r0, t5);\
+ BF(a3.im, a1.im, i1, t3);\
+ BF(t4, t6, t2, t6);\
+ BF(a3.re, a1.re, r1, t4);\
+ BF(a2.im, a0.im, i0, t6);\
+}
+
+#define TRANSFORM(a0,a1,a2,a3,wre,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 TRANSFORM_ZERO(a0,a1,a2,a3) {\
+ t1 = a2.re;\
+ t2 = a2.im;\
+ t5 = a3.re;\
+ t6 = a3.im;\
+ BUTTERFLIES(a0,a1,a2,a3)\
+}
+
+/* z[0...8n-1], w[1...2n-1] */
+#define PASS(name)\
+static void name(FFTComplex *z, const FFTSample *wre, unsigned int n)\
+{\
+ FFTDouble t1, t2, t3, t4, t5, t6;\
+ int o1 = 2*n;\
+ int o2 = 4*n;\
+ int o3 = 6*n;\
+ const FFTSample *wim = wre+o1;\
+ n--;\
+\
+ TRANSFORM_ZERO(z[0],z[o1],z[o2],z[o3]);\
+ TRANSFORM(z[1],z[o1+1],z[o2+1],z[o3+1],wre[1],wim[-1]);\
+ do {\
+ z += 2;\
+ wre += 2;\
+ wim -= 2;\
+ TRANSFORM(z[0],z[o1],z[o2],z[o3],wre[0],wim[0]);\
+ TRANSFORM(z[1],z[o1+1],z[o2+1],z[o3+1],wre[1],wim[-1]);\
+ } while(--n);\
+}
+
+PASS(pass)
+#if !CONFIG_SMALL
+#undef BUTTERFLIES
+#define BUTTERFLIES BUTTERFLIES_BIG
+PASS(pass_big)
+#endif
+
+#define DECL_FFT(n,n2,n4)\
+static void fft##n(FFTComplex *z)\
+{\
+ fft##n2(z);\
+ fft##n4(z+n4*2);\
+ fft##n4(z+n4*3);\
+ pass(z,FFT_NAME(ff_cos_##n),n4/2);\
+}
+
+static void fft4(FFTComplex *z)
+{
+ 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);
+ BF(z[2].re, z[0].re, t1, t6);
+ BF(t4, t2, z[0].im, z[1].im);
+ BF(t7, t5, z[2].im, z[3].im);
+ BF(z[3].im, z[1].im, t4, t8);
+ BF(z[3].re, z[1].re, t3, t7);
+ BF(z[2].im, z[0].im, t2, t5);
+}
+
+static void fft8(FFTComplex *z)
+{
+ 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(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)
+{
+ 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);
+ fft4(z+12);
+
+ 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],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)
+#endif
+DECL_FFT(32,16,8)
+DECL_FFT(64,32,16)
+DECL_FFT(128,64,32)
+DECL_FFT(256,128,64)
+DECL_FFT(512,256,128)
+#if !CONFIG_SMALL
+#define pass pass_big
+#endif
+DECL_FFT(1024,512,256)
+DECL_FFT(2048,1024,512)
+DECL_FFT(4096,2048,1024)
+DECL_FFT(8192,4096,2048)
+DECL_FFT(16384,8192,4096)
+DECL_FFT(32768,16384,8192)
+DECL_FFT(65536,32768,16384)
+DECL_FFT(131072,65536,32768)
+
+static void (* const fft_dispatch[])(FFTComplex*) = {
+ fft4, fft8, fft16, fft32, fft64, fft128, fft256, fft512, fft1024,
+ fft2048, fft4096, fft8192, fft16384, fft32768, fft65536, fft131072
+};
+
+static void fft_calc_c(FFTContext *s, FFTComplex *z)
+{
+ fft_dispatch[s->nbits-2](z);
+}
+#endif /* FFT_FIXED_32 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 04:36:40 +0000