From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 media/ffvpx/libavcodec/fft_template.c | 628 ++++++++++++++++++++++++++++++++++
 1 file changed, 628 insertions(+)
 create mode 100644 media/ffvpx/libavcodec/fft_template.c

(limited to 'media/ffvpx/libavcodec/fft_template.c')

diff --git a/media/ffvpx/libavcodec/fft_template.c b/media/ffvpx/libavcodec/fft_template.c
new file mode 100644
index 0000000000..f2742a3ae8
--- /dev/null
+++ b/media/ffvpx/libavcodec/fft_template.c
@@ -0,0 +1,628 @@
+/*
+ * 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_FLOAT
+#include "fft_table.h"
+#else /* !FFT_FLOAT */
+
+/* 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 },
+};
+
+av_cold void ff_init_ff_cos_tabs(int index)
+{
+    ff_thread_once(&cos_tabs_init_once[index].control, cos_tabs_init_once[index].func);
+}
+#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_FLOAT */
+
+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;
+}
+
+
+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_FLOAT
+#if ARCH_AARCH64
+    ff_fft_init_aarch64(s);
+#elif ARCH_ARM
+    ff_fft_init_arm(s);
+#elif ARCH_PPC
+    ff_fft_init_ppc(s);
+#elif ARCH_X86
+    ff_fft_init_x86(s);
+#endif
+#if HAVE_MIPSFPU
+    ff_fft_init_mips(s);
+#endif
+    for(j=4; j<=nbits; j++) {
+        ff_init_ff_cos_tabs(j);
+    }
+#else /* FFT_FLOAT */
+    ff_fft_lut_init();
+#endif
+
+
+    if (ARCH_X86 && FFT_FLOAT && 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_FLOAT
+
+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_FLOAT */
+
+#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_FLOAT */
-- 
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