diff options
Diffstat (limited to 'libavutil/tx.c')
-rw-r--r-- | libavutil/tx.c | 693 |
1 files changed, 17 insertions, 676 deletions
diff --git a/libavutil/tx.c b/libavutil/tx.c index 93f6e489d3..b8683b416b 100644 --- a/libavutil/tx.c +++ b/libavutil/tx.c @@ -1,10 +1,4 @@ /* - * 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 @@ -22,576 +16,10 @@ * 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) - -static void monolithic_fft(AVTXContext *s, void *_out, void *_in, - ptrdiff_t stride) -{ - 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); - } -} +#include "tx_priv.h" /* 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++) @@ -601,14 +29,17 @@ static int mulinv(int n, int m) } /* 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 type = s->type; 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 = type == AV_TX_FLOAT_MDCT || type == AV_TX_DOUBLE_MDCT; if (!(s->pfatab = av_malloc(2*len*sizeof(*s->pfatab)))) return AVERROR(ENOMEM); @@ -619,7 +50,7 @@ static int gen_compound_mapping(AVTXContext *s, int n, int m, int inv, /* 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; } @@ -649,23 +80,10 @@ static int gen_compound_mapping(AVTXContext *s, int n, int m, int inv, return 0; } -static int split_radix_permutation(int i, int n, int inverse) +int ff_tx_gen_ptwo_revtab(AVTXContext *s) { - 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); @@ -678,23 +96,6 @@ static int get_ptwo_revtab(AVTXContext *s, int m, int inv) return 0; } -static int gen_mdct_exptab(AVTXContext *s, int len4, double scale) -{ - const double theta = (scale < 0 ? len4 : 0) + 1.0/8.0; - - if (!(s->exptab = av_malloc_array(len4, sizeof(*s->exptab)))) - 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; - } - - return 0; -} - av_cold void av_tx_uninit(AVTXContext **ctx) { if (!(*ctx)) @@ -708,71 +109,6 @@ av_cold void av_tx_uninit(AVTXContext **ctx) 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) { @@ -784,7 +120,12 @@ av_cold int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, 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; default: |