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Diffstat (limited to 'plugins/supereq/ffmpeg_fft/libavcodec/fft.c')
-rw-r--r--plugins/supereq/ffmpeg_fft/libavcodec/fft.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/plugins/supereq/ffmpeg_fft/libavcodec/fft.c b/plugins/supereq/ffmpeg_fft/libavcodec/fft.c
new file mode 100644
index 00000000..04082bf4
--- /dev/null
+++ b/plugins/supereq/ffmpeg_fft/libavcodec/fft.c
@@ -0,0 +1,300 @@
+/*
+ * 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 "fft.h"
+
+/* 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);
+#endif
+COSTABLE_CONST FFTSample * const 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,
+};
+
+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
+ int i;
+ int m = 1<<index;
+ double freq = 2*M_PI/m;
+ FFTSample *tab = ff_cos_tabs[index];
+ for(i=0; i<=m/4; i++)
+ tab[i] = cos(i*freq);
+ for(i=1; i<m/4; i++)
+ tab[m/2-i] = tab[i];
+#endif
+}
+
+av_cold int ff_fft_init(FFTContext *s, int nbits, int inverse)
+{
+ int i, j, n;
+
+ if (nbits < 2 || nbits > 16)
+ goto fail;
+ s->nbits = nbits;
+ n = 1 << nbits;
+
+ s->revtab = av_malloc(n * sizeof(uint16_t));
+ if (!s->revtab)
+ goto fail;
+ s->tmp_buf = av_malloc(n * sizeof(FFTComplex));
+ if (!s->tmp_buf)
+ goto fail;
+ s->inverse = inverse;
+
+ s->fft_permute = ff_fft_permute_c;
+ s->fft_calc = ff_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 ARCH_ARM
+ ff_fft_init_arm(s);
+#elif HAVE_ALTIVEC
+ if (HAVE_ALTIVEC) ff_fft_init_altivec(s);
+#elif HAVE_MMX
+ if (HAVE_MMX) ff_fft_init_mmx(s);
+#endif
+
+ for(j=4; j<=nbits; j++) {
+ ff_init_ff_cos_tabs(j);
+ }
+ for(i=0; i<n; i++)
+ s->revtab[-split_radix_permutation(i, n, s->inverse) & (n-1)] = i;
+
+ return 0;
+ fail:
+ av_freep(&s->revtab);
+ av_freep(&s->tmp_buf);
+ return -1;
+}
+
+void ff_fft_permute_c(FFTContext *s, FFTComplex *z)
+{
+ int j, np;
+ const uint16_t *revtab = s->revtab;
+ np = 1 << s->nbits;
+ /* TODO: handle split-radix permute in a more optimal way, probably in-place */
+ for(j=0;j<np;j++) s->tmp_buf[revtab[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->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);\
+ 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) {\
+ 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;\
+ 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)\
+{\
+ FFTSample 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)
+#undef BUTTERFLIES
+#define BUTTERFLIES BUTTERFLIES_BIG
+PASS(pass_big)
+
+#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,ff_cos_##n,n4/2);\
+}
+
+static void fft4(FFTComplex *z)
+{
+ FFTSample 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)
+{
+ FFTSample t1, t2, t3, t4, t5, t6, t7, t8;
+
+ 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);
+
+ 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;
+
+ 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],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]);
+}
+#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)
+
+static void (* const fft_dispatch[])(FFTComplex*) = {
+ fft4, fft8, fft16, fft32, fft64, fft128, fft256, fft512, fft1024,
+ fft2048, fft4096, fft8192, fft16384, fft32768, fft65536,
+};
+
+void ff_fft_calc_c(FFTContext *s, FFTComplex *z)
+{
+ fft_dispatch[s->nbits-2](z);
+}
+
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