/*
- * Copyright (c) 2019 Lynne <dev@lynne.ee>
- * Power of two FFT:
- * 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include <stddef.h>
-#include "tx.h"
-#include "thread.h"
-#include "mem.h"
-#include "avassert.h"
-
-typedef float FFTSample;
-typedef AVComplexFloat FFTComplex;
-
-struct AVTXContext {
- int n; /* Nptwo part */
- int m; /* Ptwo part */
-
- FFTComplex *exptab; /* MDCT exptab */
- FFTComplex *tmp; /* Temporary buffer needed for all compound transforms */
- int *pfatab; /* Input/Output mapping for compound transforms */
- int *revtab; /* Input mapping for power of two transforms */
-};
-
-#define FFT_NAME(x) x
-
-#define COSTABLE(size) \
- static DECLARE_ALIGNED(32, FFTSample, FFT_NAME(ff_cos_##size))[size/2]
-
-static FFTSample * const FFT_NAME(ff_cos_tabs)[18];
-
-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 m = 1 << index;
- double freq = 2*M_PI/m;
- FFTSample *tab = FFT_NAME(ff_cos_tabs)[index];
- for(int i = 0; i <= m/4; i++)
- tab[i] = cos(i*freq);
- for(int 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 },
-};
-
-static 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),
-};
-
-static 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);
-}
-
-static AVOnce tabs_53_once = AV_ONCE_INIT;
-static DECLARE_ALIGNED(32, FFTComplex, FFT_NAME(ff_53_tabs))[4];
-
-static av_cold void ff_init_53_tabs(void)
-{
- ff_53_tabs[0] = (FFTComplex){ cos(2 * M_PI / 12), cos(2 * M_PI / 12) };
- ff_53_tabs[1] = (FFTComplex){ 0.5, 0.5 };
- ff_53_tabs[2] = (FFTComplex){ cos(2 * M_PI / 5), sin(2 * M_PI / 5) };
- ff_53_tabs[3] = (FFTComplex){ cos(2 * M_PI / 10), sin(2 * M_PI / 10) };
-}
-
-#define BF(x, y, a, b) do { \
- x = (a) - (b); \
- y = (a) + (b); \
- } while (0)
-
-#define CMUL(dre, dim, are, aim, bre, bim) do { \
- (dre) = (are) * (bre) - (aim) * (bim); \
- (dim) = (are) * (bim) + (aim) * (bre); \
- } while (0)
-
-#define CMUL3(c, a, b) CMUL((c).re, (c).im, (a).re, (a).im, (b).re, (b).im)
-
-static av_always_inline void fft3(FFTComplex *out, FFTComplex *in,
- ptrdiff_t stride)
-{
- FFTComplex tmp[2];
-
- tmp[0].re = in[1].im - in[2].im;
- tmp[0].im = in[1].re - in[2].re;
- tmp[1].re = in[1].re + in[2].re;
- tmp[1].im = in[1].im + in[2].im;
-
- out[0*stride].re = in[0].re + tmp[1].re;
- out[0*stride].im = in[0].im + tmp[1].im;
-
- tmp[0].re *= ff_53_tabs[0].re;
- tmp[0].im *= ff_53_tabs[0].im;
- tmp[1].re *= ff_53_tabs[1].re;
- tmp[1].im *= ff_53_tabs[1].re;
-
- out[1*stride].re = in[0].re - tmp[1].re + tmp[0].re;
- out[1*stride].im = in[0].im - tmp[1].im - tmp[0].im;
- out[2*stride].re = in[0].re - tmp[1].re - tmp[0].re;
- out[2*stride].im = in[0].im - tmp[1].im + tmp[0].im;
-}
-
-#define DECL_FFT5(NAME, D0, D1, D2, D3, D4) \
-static av_always_inline void NAME(FFTComplex *out, FFTComplex *in, \
- ptrdiff_t stride) \
-{ \
- FFTComplex z0[4], t[6]; \
- \
- t[0].re = in[1].re + in[4].re; \
- t[0].im = in[1].im + in[4].im; \
- t[1].im = in[1].re - in[4].re; \
- t[1].re = in[1].im - in[4].im; \
- t[2].re = in[2].re + in[3].re; \
- t[2].im = in[2].im + in[3].im; \
- t[3].im = in[2].re - in[3].re; \
- t[3].re = in[2].im - in[3].im; \
- \
- out[D0*stride].re = in[0].re + in[1].re + in[2].re + \
- in[3].re + in[4].re; \
- out[D0*stride].im = in[0].im + in[1].im + in[2].im + \
- in[3].im + in[4].im; \
- \
- t[4].re = ff_53_tabs[2].re * t[2].re - ff_53_tabs[3].re * t[0].re; \
- t[4].im = ff_53_tabs[2].re * t[2].im - ff_53_tabs[3].re * t[0].im; \
- t[0].re = ff_53_tabs[2].re * t[0].re - ff_53_tabs[3].re * t[2].re; \
- t[0].im = ff_53_tabs[2].re * t[0].im - ff_53_tabs[3].re * t[2].im; \
- t[5].re = ff_53_tabs[2].im * t[3].re - ff_53_tabs[3].im * t[1].re; \
- t[5].im = ff_53_tabs[2].im * t[3].im - ff_53_tabs[3].im * t[1].im; \
- t[1].re = ff_53_tabs[2].im * t[1].re + ff_53_tabs[3].im * t[3].re; \
- t[1].im = ff_53_tabs[2].im * t[1].im + ff_53_tabs[3].im * t[3].im; \
- \
- z0[0].re = t[0].re - t[1].re; \
- z0[0].im = t[0].im - t[1].im; \
- z0[1].re = t[4].re + t[5].re; \
- z0[1].im = t[4].im + t[5].im; \
- \
- z0[2].re = t[4].re - t[5].re; \
- z0[2].im = t[4].im - t[5].im; \
- z0[3].re = t[0].re + t[1].re; \
- z0[3].im = t[0].im + t[1].im; \
- \
- out[D1*stride].re = in[0].re + z0[3].re; \
- out[D1*stride].im = in[0].im + z0[0].im; \
- out[D2*stride].re = in[0].re + z0[2].re; \
- out[D2*stride].im = in[0].im + z0[1].im; \
- out[D3*stride].re = in[0].re + z0[1].re; \
- out[D3*stride].im = in[0].im + z0[2].im; \
- out[D4*stride].re = in[0].re + z0[0].re; \
- out[D4*stride].im = in[0].im + z0[3].im; \
-}
-
-DECL_FFT5(fft5, 0, 1, 2, 3, 4)
-DECL_FFT5(fft5_m1, 0, 6, 12, 3, 9)
-DECL_FFT5(fft5_m2, 10, 1, 7, 13, 4)
-DECL_FFT5(fft5_m3, 5, 11, 2, 8, 14)
-
-static av_always_inline void fft15(FFTComplex *out, FFTComplex *in,
- ptrdiff_t stride)
-{
- FFTComplex tmp[15];
-
- for (int i = 0; i < 5; i++)
- fft3(tmp + i, in + i*3, 5);
-
- fft5_m1(out, tmp + 0, stride);
- fft5_m2(out, tmp + 5, stride);
- fft5_m3(out, tmp + 10, stride);
-}
-
-#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)\
-{\
- 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,FFT_NAME(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;
-
- 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],M_SQRT1_2,M_SQRT1_2);
-}
-
-static void fft16(FFTComplex *z)
-{
- FFTSample 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],M_SQRT1_2,M_SQRT1_2);
- 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);
-}
-
-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)
-#define pass pass_big
-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
-};
-
-#define DECL_COMP_FFT(N) \
-static void compound_fft_##N##xM(AVTXContext *s, void *_out, \
- void *_in, ptrdiff_t stride) \
-{ \
- const int m = s->m, *in_map = s->pfatab, *out_map = in_map + N*m; \
- FFTComplex *in = _in; \
- FFTComplex *out = _out; \
- FFTComplex fft##N##in[N]; \
- void (*fftp)(FFTComplex *z) = fft_dispatch[av_log2(m) - 2]; \
- \
- for (int i = 0; i < m; i++) { \
- for (int j = 0; j < N; j++) \
- fft##N##in[j] = in[in_map[i*N + j]]; \
- fft##N(s->tmp + s->revtab[i], fft##N##in, m); \
- } \
- \
- for (int i = 0; i < N; i++) \
- fftp(s->tmp + m*i); \
- \
- for (int i = 0; i < N*m; i++) \
- out[i] = s->tmp[out_map[i]]; \
-}
-
-DECL_COMP_FFT(3)
-DECL_COMP_FFT(5)
-DECL_COMP_FFT(15)
+#include "tx_priv.h"
-static void monolithic_fft(AVTXContext *s, void *_out, void *_in,
- ptrdiff_t stride)
+int ff_tx_type_is_mdct(enum AVTXType type)
{
- FFTComplex *in = _in;
- FFTComplex *out = _out;
- int m = s->m, mb = av_log2(m) - 2;
- for (int i = 0; i < m; i++)
- out[s->revtab[i]] = in[i];
- fft_dispatch[mb](out);
-}
-
-#define DECL_COMP_IMDCT(N) \
-static void compound_imdct_##N##xM(AVTXContext *s, void *_dst, void *_src, \
- ptrdiff_t stride) \
-{ \
- FFTComplex fft##N##in[N]; \
- FFTComplex *z = _dst, *exp = s->exptab; \
- const int m = s->m, len8 = N*m >> 1; \
- const int *in_map = s->pfatab, *out_map = in_map + N*m; \
- const float *src = _src, *in1, *in2; \
- void (*fftp)(FFTComplex *) = fft_dispatch[av_log2(m) - 2]; \
- \
- stride /= sizeof(*src); /* To convert it from bytes */ \
- in1 = src; \
- in2 = src + ((N*m*2) - 1) * stride; \
- \
- for (int i = 0; i < m; i++) { \
- for (int j = 0; j < N; j++) { \
- const int k = in_map[i*N + j]; \
- FFTComplex tmp = { in2[-k*stride], in1[k*stride] }; \
- CMUL3(fft##N##in[j], tmp, exp[k >> 1]); \
- } \
- fft##N(s->tmp + s->revtab[i], fft##N##in, m); \
- } \
- \
- for (int i = 0; i < N; i++) \
- fftp(s->tmp + m*i); \
- \
- for (int i = 0; i < len8; i++) { \
- const int i0 = len8 + i, i1 = len8 - i - 1; \
- const int s0 = out_map[i0], s1 = out_map[i1]; \
- FFTComplex src1 = { s->tmp[s1].im, s->tmp[s1].re }; \
- FFTComplex src0 = { s->tmp[s0].im, s->tmp[s0].re }; \
- \
- CMUL(z[i1].re, z[i0].im, src1.re, src1.im, exp[i1].im, exp[i1].re); \
- CMUL(z[i0].re, z[i1].im, src0.re, src0.im, exp[i0].im, exp[i0].re); \
- } \
-}
-
-DECL_COMP_IMDCT(3)
-DECL_COMP_IMDCT(5)
-DECL_COMP_IMDCT(15)
-
-#define DECL_COMP_MDCT(N) \
-static void compound_mdct_##N##xM(AVTXContext *s, void *_dst, void *_src, \
- ptrdiff_t stride) \
-{ \
- float *src = _src, *dst = _dst; \
- FFTComplex *exp = s->exptab, tmp, fft##N##in[N]; \
- const int m = s->m, len4 = N*m, len3 = len4 * 3, len8 = len4 >> 1; \
- const int *in_map = s->pfatab, *out_map = in_map + N*m; \
- void (*fftp)(FFTComplex *) = fft_dispatch[av_log2(m) - 2]; \
- \
- stride /= sizeof(*dst); \
- \
- for (int i = 0; i < m; i++) { /* Folding and pre-reindexing */ \
- for (int j = 0; j < N; j++) { \
- const int k = in_map[i*N + j]; \
- if (k < len4) { \
- tmp.re = -src[ len4 + k] + src[1*len4 - 1 - k]; \
- tmp.im = -src[ len3 + k] - src[1*len3 - 1 - k]; \
- } else { \
- tmp.re = -src[ len4 + k] - src[5*len4 - 1 - k]; \
- tmp.im = src[-len4 + k] - src[1*len3 - 1 - k]; \
- } \
- CMUL(fft##N##in[j].im, fft##N##in[j].re, tmp.re, tmp.im, \
- exp[k >> 1].re, exp[k >> 1].im); \
- } \
- fft##N(s->tmp + s->revtab[i], fft##N##in, m); \
- } \
- \
- for (int i = 0; i < N; i++) \
- fftp(s->tmp + m*i); \
- \
- for (int i = 0; i < len8; i++) { \
- const int i0 = len8 + i, i1 = len8 - i - 1; \
- const int s0 = out_map[i0], s1 = out_map[i1]; \
- FFTComplex src1 = { s->tmp[s1].re, s->tmp[s1].im }; \
- FFTComplex src0 = { s->tmp[s0].re, s->tmp[s0].im }; \
- \
- CMUL(dst[2*i1*stride + stride], dst[2*i0*stride], src0.re, src0.im, \
- exp[i0].im, exp[i0].re); \
- CMUL(dst[2*i0*stride + stride], dst[2*i1*stride], src1.re, src1.im, \
- exp[i1].im, exp[i1].re); \
- } \
-}
-
-DECL_COMP_MDCT(3)
-DECL_COMP_MDCT(5)
-DECL_COMP_MDCT(15)
-
-static void monolithic_imdct(AVTXContext *s, void *_dst, void *_src,
- ptrdiff_t stride)
-{
- FFTComplex *z = _dst, *exp = s->exptab;
- const int m = s->m, len8 = m >> 1;
- const float *src = _src, *in1, *in2;
- void (*fftp)(FFTComplex *) = fft_dispatch[av_log2(m) - 2];
-
- stride /= sizeof(*src);
- in1 = src;
- in2 = src + ((m*2) - 1) * stride;
-
- for (int i = 0; i < m; i++) {
- FFTComplex tmp = { in2[-2*i*stride], in1[2*i*stride] };
- CMUL3(z[s->revtab[i]], tmp, exp[i]);
- }
-
- fftp(z);
-
- for (int i = 0; i < len8; i++) {
- const int i0 = len8 + i, i1 = len8 - i - 1;
- FFTComplex src1 = { z[i1].im, z[i1].re };
- FFTComplex src0 = { z[i0].im, z[i0].re };
-
- CMUL(z[i1].re, z[i0].im, src1.re, src1.im, exp[i1].im, exp[i1].re);
- CMUL(z[i0].re, z[i1].im, src0.re, src0.im, exp[i0].im, exp[i0].re);
- }
-}
-
-static void monolithic_mdct(AVTXContext *s, void *_dst, void *_src,
- ptrdiff_t stride)
-{
- float *src = _src, *dst = _dst;
- FFTComplex *exp = s->exptab, tmp, *z = _dst;
- const int m = s->m, len4 = m, len3 = len4 * 3, len8 = len4 >> 1;
- void (*fftp)(FFTComplex *) = fft_dispatch[av_log2(m) - 2];
-
- stride /= sizeof(*dst);
-
- for (int i = 0; i < m; i++) { /* Folding and pre-reindexing */
- const int k = 2*i;
- if (k < len4) {
- tmp.re = -src[ len4 + k] + src[1*len4 - 1 - k];
- tmp.im = -src[ len3 + k] - src[1*len3 - 1 - k];
- } else {
- tmp.re = -src[ len4 + k] - src[5*len4 - 1 - k];
- tmp.im = src[-len4 + k] - src[1*len3 - 1 - k];
- }
- CMUL(z[s->revtab[i]].im, z[s->revtab[i]].re, tmp.re, tmp.im,
- exp[i].re, exp[i].im);
- }
-
- fftp(z);
-
- for (int i = 0; i < len8; i++) {
- const int i0 = len8 + i, i1 = len8 - i - 1;
- FFTComplex src1 = { z[i1].re, z[i1].im };
- FFTComplex src0 = { z[i0].re, z[i0].im };
-
- CMUL(dst[2*i1*stride + stride], dst[2*i0*stride], src0.re, src0.im,
- exp[i0].im, exp[i0].re);
- CMUL(dst[2*i0*stride + stride], dst[2*i1*stride], src1.re, src1.im,
- exp[i1].im, exp[i1].re);
+ switch (type) {
+ case AV_TX_FLOAT_MDCT:
+ case AV_TX_DOUBLE_MDCT:
+ case AV_TX_INT32_MDCT:
+ return 1;
+ default:
+ return 0;
}
}
/* Calculates the modular multiplicative inverse, not fast, replace */
-static int mulinv(int n, int m)
+static av_always_inline int mulinv(int n, int m)
{
n = n % m;
for (int x = 1; x < m; x++)
}
/* Guaranteed to work for any n, m where gcd(n, m) == 1 */
-static int gen_compound_mapping(AVTXContext *s, int n, int m, int inv,
- enum AVTXType type)
+int ff_tx_gen_compound_mapping(AVTXContext *s)
{
int *in_map, *out_map;
+ const int n = s->n;
+ const int m = s->m;
+ const int inv = s->inv;
const int len = n*m;
const int m_inv = mulinv(m, n);
const int n_inv = mulinv(n, m);
- const int mdct = type == AV_TX_FLOAT_MDCT;
+ const int mdct = ff_tx_type_is_mdct(s->type);
if (!(s->pfatab = av_malloc(2*len*sizeof(*s->pfatab))))
return AVERROR(ENOMEM);
/* Ruritanian map for input, CRT map for output, can be swapped */
for (int j = 0; j < m; j++) {
for (int i = 0; i < n; i++) {
- /* Shifted by 1 to simplify forward MDCTs */
+ /* Shifted by 1 to simplify MDCTs */
in_map[j*n + i] = ((i*m + j*n) % len) << mdct;
out_map[(i*m*m_inv + j*n*n_inv) % len] = i*m + j;
}
return 0;
}
-static int split_radix_permutation(int i, int n, int inverse)
+int ff_tx_gen_ptwo_revtab(AVTXContext *s, int invert_lookup)
{
- 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;
-}
+ const int m = s->m, inv = s->inv;
-static int get_ptwo_revtab(AVTXContext *s, int m, int inv)
-{
if (!(s->revtab = av_malloc(m*sizeof(*s->revtab))))
return AVERROR(ENOMEM);
/* Default */
for (int i = 0; i < m; i++) {
int k = -split_radix_permutation(i, m, inv) & (m - 1);
- s->revtab[k] = i;
+ if (invert_lookup)
+ s->revtab[i] = k;
+ else
+ s->revtab[k] = i;
}
return 0;
}
-static int gen_mdct_exptab(AVTXContext *s, int len4, double scale)
+int ff_tx_gen_ptwo_inplace_revtab_idx(AVTXContext *s)
{
- const double theta = (scale < 0 ? len4 : 0) + 1.0/8.0;
+ int nb_inplace_idx = 0;
- if (!(s->exptab = av_malloc_array(len4, sizeof(*s->exptab))))
+ if (!(s->inplace_idx = av_malloc(s->m*sizeof(*s->inplace_idx))))
return AVERROR(ENOMEM);
- scale = sqrt(fabs(scale));
- for (int i = 0; i < len4; i++) {
- const double alpha = M_PI_2 * (i + theta) / len4;
- s->exptab[i].re = cos(alpha) * scale;
- s->exptab[i].im = sin(alpha) * scale;
+ for (int src = 1; src < s->m; src++) {
+ int dst = s->revtab[src];
+ int found = 0;
+
+ if (dst <= src)
+ continue;
+
+ do {
+ for (int j = 0; j < nb_inplace_idx; j++) {
+ if (dst == s->inplace_idx[j]) {
+ found = 1;
+ break;
+ }
+ }
+ dst = s->revtab[dst];
+ } while (dst != src && !found);
+
+ if (!found)
+ s->inplace_idx[nb_inplace_idx++] = src;
}
+ s->inplace_idx[nb_inplace_idx++] = 0;
+
return 0;
}
av_free((*ctx)->pfatab);
av_free((*ctx)->exptab);
av_free((*ctx)->revtab);
+ av_free((*ctx)->inplace_idx);
av_free((*ctx)->tmp);
av_freep(ctx);
}
-static int init_mdct_fft(AVTXContext *s, av_tx_fn *tx, enum AVTXType type,
- int inv, int len, const void *scale, uint64_t flags)
-{
- int err, n = 1, m = 1, max_ptwo = 1 << (FF_ARRAY_ELEMS(fft_dispatch) + 1);
-
- if (type == AV_TX_FLOAT_MDCT)
- len >>= 1;
-
-#define CHECK_FACTOR(DST, FACTOR, SRC) \
- if (DST == 1 && !(SRC % FACTOR)) { \
- DST = FACTOR; \
- SRC /= FACTOR; \
- }
- CHECK_FACTOR(n, 15, len)
- CHECK_FACTOR(n, 5, len)
- CHECK_FACTOR(n, 3, len)
-#undef CHECK_NPTWO_FACTOR
-
- /* len must be a power of two now */
- if (!(len & (len - 1)) && len >= 4 && len <= max_ptwo) {
- m = len;
- len = 1;
- }
-
- /* Filter out direct 3, 5 and 15 transforms, too niche */
- if (len > 1 || m == 1) {
- av_log(NULL, AV_LOG_ERROR, "Unsupported transform size: n = %i, "
- "m = %i, residual = %i!\n", n, m, len);
- return AVERROR(EINVAL);
- } else if (n > 1 && m > 1) { /* 2D transform case */
- if ((err = gen_compound_mapping(s, n, m, inv, type)))
- return err;
- if (!(s->tmp = av_malloc(n*m*sizeof(*s->tmp))))
- return AVERROR(ENOMEM);
- *tx = n == 3 ? compound_fft_3xM :
- n == 5 ? compound_fft_5xM :
- compound_fft_15xM;
- if (type == AV_TX_FLOAT_MDCT)
- *tx = n == 3 ? inv ? compound_imdct_3xM : compound_mdct_3xM :
- n == 5 ? inv ? compound_imdct_5xM : compound_mdct_5xM :
- inv ? compound_imdct_15xM : compound_mdct_15xM;
- } else { /* Direct transform case */
- *tx = monolithic_fft;
- if (type == AV_TX_FLOAT_MDCT)
- *tx = inv ? monolithic_imdct : monolithic_mdct;
- }
-
- if (n != 1)
- ff_thread_once(&tabs_53_once, ff_init_53_tabs);
- if (m != 1) {
- get_ptwo_revtab(s, m, inv);
- for (int i = 4; i <= av_log2(m); i++)
- ff_init_ff_cos_tabs(i);
- }
-
- if (type == AV_TX_FLOAT_MDCT)
- if ((err = gen_mdct_exptab(s, n*m, *((float *)scale))))
- return err;
-
- s->n = n;
- s->m = m;
-
- return 0;
-}
-
av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type,
int inv, int len, const void *scale, uint64_t flags)
{
switch (type) {
case AV_TX_FLOAT_FFT:
case AV_TX_FLOAT_MDCT:
- if ((err = init_mdct_fft(s, tx, type, inv, len, scale, flags)))
+ if ((err = ff_tx_init_mdct_fft_float(s, tx, type, inv, len, scale, flags)))
+ goto fail;
+ break;
+ case AV_TX_DOUBLE_FFT:
+ case AV_TX_DOUBLE_MDCT:
+ if ((err = ff_tx_init_mdct_fft_double(s, tx, type, inv, len, scale, flags)))
+ goto fail;
+ break;
+ case AV_TX_INT32_FFT:
+ case AV_TX_INT32_MDCT:
+ if ((err = ff_tx_init_mdct_fft_int32(s, tx, type, inv, len, scale, flags)))
goto fail;
break;
default:
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