mirror of https://git.ffmpeg.org/ffmpeg.git
190 lines
6.8 KiB
C
190 lines
6.8 KiB
C
/*
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* FFT/IFFT transforms
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* AltiVec-enabled
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* Copyright (c) 2009 Loren Merritt
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/fft.h"
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#include "util_altivec.h"
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#include "types_altivec.h"
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#include "regs.h"
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/**
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* Do a complex FFT with the parameters defined in ff_fft_init(). The
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* input data must be permuted before with s->revtab table. No
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* 1.0/sqrt(n) normalization is done.
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* AltiVec-enabled
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* This code assumes that the 'z' pointer is 16 bytes-aligned
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* It also assumes all FFTComplex are 8 bytes-aligned pair of float
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*/
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// Pointers to functions. Not using function pointer syntax, because
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// that involves an extra level of indirection on some PPC ABIs.
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extern void *ff_fft_dispatch_altivec[2][15];
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#if HAVE_GNU_AS
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static av_always_inline void fft_dispatch(FFTContext *s, FFTComplex *z, int do_swizzle)
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{
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register vec_f v14 __asm__("v14") = {0,0,0,0};
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register vec_f v15 __asm__("v15") = *(const vec_f*)ff_cos_16;
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register vec_f v16 __asm__("v16") = {0, 0.38268343, M_SQRT1_2, 0.92387953};
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register vec_f v17 __asm__("v17") = {-M_SQRT1_2, M_SQRT1_2, M_SQRT1_2,-M_SQRT1_2};
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register vec_f v18 __asm__("v18") = { M_SQRT1_2, M_SQRT1_2, M_SQRT1_2, M_SQRT1_2};
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register vec_u8 v19 __asm__("v19") = vcprm(s0,3,2,1);
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register vec_u8 v20 __asm__("v20") = vcprm(0,1,s2,s1);
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register vec_u8 v21 __asm__("v21") = vcprm(2,3,s0,s3);
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register vec_u8 v22 __asm__("v22") = vcprm(2,s3,3,s2);
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register vec_u8 v23 __asm__("v23") = vcprm(0,1,s0,s1);
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register vec_u8 v24 __asm__("v24") = vcprm(2,3,s2,s3);
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register vec_u8 v25 __asm__("v25") = vcprm(2,3,0,1);
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register vec_u8 v26 __asm__("v26") = vcprm(1,2,s3,s0);
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register vec_u8 v27 __asm__("v27") = vcprm(0,3,s2,s1);
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register vec_u8 v28 __asm__("v28") = vcprm(0,2,s1,s3);
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register vec_u8 v29 __asm__("v29") = vcprm(1,3,s0,s2);
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register FFTSample *const*cos_tabs __asm__("r12") = ff_cos_tabs;
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register FFTComplex *zarg __asm__("r3") = z;
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__asm__(
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"mtctr %0 \n"
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"li "r(9)", 16 \n"
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"subi "r(1)","r(1) ",%1 \n"
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"bctrl \n"
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"addi "r(1)","r(1) ",%1 \n"
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::"r"(ff_fft_dispatch_altivec[do_swizzle][s->nbits-2]), "i"(12*sizeof(void*)),
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"r"(zarg), "r"(cos_tabs),
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"v"(v14),"v"(v15),"v"(v16),"v"(v17),"v"(v18),"v"(v19),"v"(v20),"v"(v21),
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"v"(v22),"v"(v23),"v"(v24),"v"(v25),"v"(v26),"v"(v27),"v"(v28),"v"(v29)
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: "lr","ctr","r0","r4","r5","r6","r7","r8","r9","r10","r11",
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"v0","v1","v2","v3","v4","v5","v6","v7","v8","v9","v10","v11","v12","v13"
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);
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}
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static void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z)
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{
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fft_dispatch(s, z, 1);
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}
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static void ff_imdct_half_altivec(FFTContext *s, FFTSample *output, const FFTSample *input)
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{
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int j, k;
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int n = 1 << s->mdct_bits;
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int n4 = n >> 2;
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int n8 = n >> 3;
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int n32 = n >> 5;
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const uint16_t *revtabj = s->revtab;
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const uint16_t *revtabk = s->revtab+n4;
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const vec_f *tcos = (const vec_f*)(s->tcos+n8);
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const vec_f *tsin = (const vec_f*)(s->tsin+n8);
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const vec_f *pin = (const vec_f*)(input+n4);
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vec_f *pout = (vec_f*)(output+n4);
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/* pre rotation */
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k = n32-1;
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do {
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vec_f cos,sin,cos0,sin0,cos1,sin1,re,im,r0,i0,r1,i1,a,b,c,d;
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#define CMULA(p,o0,o1,o2,o3)\
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a = pin[ k*2+p]; /* { z[k].re, z[k].im, z[k+1].re, z[k+1].im } */\
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b = pin[-k*2-p-1]; /* { z[-k-2].re, z[-k-2].im, z[-k-1].re, z[-k-1].im } */\
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re = vec_perm(a, b, vcprm(0,2,s0,s2)); /* { z[k].re, z[k+1].re, z[-k-2].re, z[-k-1].re } */\
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im = vec_perm(a, b, vcprm(s3,s1,3,1)); /* { z[-k-1].im, z[-k-2].im, z[k+1].im, z[k].im } */\
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cos = vec_perm(cos0, cos1, vcprm(o0,o1,s##o2,s##o3)); /* { cos[k], cos[k+1], cos[-k-2], cos[-k-1] } */\
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sin = vec_perm(sin0, sin1, vcprm(o0,o1,s##o2,s##o3));\
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r##p = im*cos - re*sin;\
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i##p = re*cos + im*sin;
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#define STORE2(v,dst)\
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j = dst;\
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vec_ste(v, 0, output+j*2);\
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vec_ste(v, 4, output+j*2);
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#define STORE8(p)\
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a = vec_perm(r##p, i##p, vcprm(0,s0,0,s0));\
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b = vec_perm(r##p, i##p, vcprm(1,s1,1,s1));\
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c = vec_perm(r##p, i##p, vcprm(2,s2,2,s2));\
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d = vec_perm(r##p, i##p, vcprm(3,s3,3,s3));\
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STORE2(a, revtabk[ p*2-4]);\
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STORE2(b, revtabk[ p*2-3]);\
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STORE2(c, revtabj[-p*2+2]);\
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STORE2(d, revtabj[-p*2+3]);
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cos0 = tcos[k];
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sin0 = tsin[k];
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cos1 = tcos[-k-1];
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sin1 = tsin[-k-1];
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CMULA(0, 0,1,2,3);
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CMULA(1, 2,3,0,1);
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STORE8(0);
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STORE8(1);
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revtabj += 4;
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revtabk -= 4;
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k--;
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} while(k >= 0);
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fft_dispatch(s, (FFTComplex*)output, 0);
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/* post rotation + reordering */
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j = -n32;
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k = n32-1;
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do {
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vec_f cos,sin,re,im,a,b,c,d;
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#define CMULB(d0,d1,o)\
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re = pout[o*2];\
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im = pout[o*2+1];\
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cos = tcos[o];\
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sin = tsin[o];\
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d0 = im*sin - re*cos;\
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d1 = re*sin + im*cos;
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CMULB(a,b,j);
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CMULB(c,d,k);
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pout[2*j] = vec_perm(a, d, vcprm(0,s3,1,s2));
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pout[2*j+1] = vec_perm(a, d, vcprm(2,s1,3,s0));
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pout[2*k] = vec_perm(c, b, vcprm(0,s3,1,s2));
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pout[2*k+1] = vec_perm(c, b, vcprm(2,s1,3,s0));
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j++;
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k--;
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} while(k >= 0);
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}
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static void ff_imdct_calc_altivec(FFTContext *s, FFTSample *output, const FFTSample *input)
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{
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int k;
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int n = 1 << s->mdct_bits;
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int n4 = n >> 2;
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int n16 = n >> 4;
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vec_u32 sign = {1<<31,1<<31,1<<31,1<<31};
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vec_u32 *p0 = (vec_u32*)(output+n4);
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vec_u32 *p1 = (vec_u32*)(output+n4*3);
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ff_imdct_half_altivec(s, output+n4, input);
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for (k = 0; k < n16; k++) {
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vec_u32 a = p0[k] ^ sign;
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vec_u32 b = p1[-k-1];
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p0[-k-1] = vec_perm(a, a, vcprm(3,2,1,0));
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p1[k] = vec_perm(b, b, vcprm(3,2,1,0));
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}
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}
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#endif /* HAVE_GNU_AS */
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av_cold void ff_fft_init_altivec(FFTContext *s)
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{
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#if HAVE_GNU_AS
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s->fft_calc = ff_fft_calc_altivec;
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s->imdct_calc = ff_imdct_calc_altivec;
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s->imdct_half = ff_imdct_half_altivec;
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#endif
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}
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