mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
3.4 KiB
102 lines
3.4 KiB
/* |
|
* SIMD optimized non-power-of-two MDCT functions |
|
* |
|
* Copyright (C) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> |
|
* |
|
* 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 |
|
*/ |
|
|
|
#include <string.h> |
|
|
|
#include "config.h" |
|
|
|
#include "libavutil/attributes.h" |
|
#include "libavutil/x86/cpu.h" |
|
#include "libavcodec/mdct15.h" |
|
|
|
void ff_mdct15_postreindex_sse3(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); |
|
void ff_mdct15_postreindex_avx2(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); |
|
|
|
void ff_fft15_avx(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride); |
|
|
|
static void perm_twiddles(MDCT15Context *s) |
|
{ |
|
int k; |
|
FFTComplex tmp[30]; |
|
|
|
/* 5-point FFT twiddles */ |
|
s->exptab[60].re = s->exptab[60].im = s->exptab[19].re; |
|
s->exptab[61].re = s->exptab[61].im = s->exptab[19].im; |
|
s->exptab[62].re = s->exptab[62].im = s->exptab[20].re; |
|
s->exptab[63].re = s->exptab[63].im = s->exptab[20].im; |
|
|
|
/* 15-point FFT twiddles */ |
|
for (k = 0; k < 5; k++) { |
|
tmp[6*k + 0] = s->exptab[k + 0]; |
|
tmp[6*k + 2] = s->exptab[k + 5]; |
|
tmp[6*k + 4] = s->exptab[k + 10]; |
|
|
|
tmp[6*k + 1] = s->exptab[2 * (k + 0)]; |
|
tmp[6*k + 3] = s->exptab[2 * (k + 5)]; |
|
tmp[6*k + 5] = s->exptab[2 * k + 5 ]; |
|
} |
|
|
|
for (k = 0; k < 6; k++) { |
|
FFTComplex ac_exp[] = { |
|
{ tmp[6*1 + k].re, tmp[6*1 + k].re }, |
|
{ tmp[6*2 + k].re, tmp[6*2 + k].re }, |
|
{ tmp[6*3 + k].re, tmp[6*3 + k].re }, |
|
{ tmp[6*4 + k].re, tmp[6*4 + k].re }, |
|
{ tmp[6*1 + k].im, -tmp[6*1 + k].im }, |
|
{ tmp[6*2 + k].im, -tmp[6*2 + k].im }, |
|
{ tmp[6*3 + k].im, -tmp[6*3 + k].im }, |
|
{ tmp[6*4 + k].im, -tmp[6*4 + k].im }, |
|
}; |
|
memcpy(s->exptab + 8*k, ac_exp, 8*sizeof(FFTComplex)); |
|
} |
|
|
|
/* Specialcase when k = 0 */ |
|
for (k = 0; k < 3; k++) { |
|
FFTComplex dc_exp[] = { |
|
{ tmp[2*k + 0].re, -tmp[2*k + 0].im }, |
|
{ tmp[2*k + 0].im, tmp[2*k + 0].re }, |
|
{ tmp[2*k + 1].re, -tmp[2*k + 1].im }, |
|
{ tmp[2*k + 1].im, tmp[2*k + 1].re }, |
|
}; |
|
memcpy(s->exptab + 8*6 + 4*k, dc_exp, 4*sizeof(FFTComplex)); |
|
} |
|
} |
|
|
|
av_cold void ff_mdct15_init_x86(MDCT15Context *s) |
|
{ |
|
int adjust_twiddles = 0; |
|
int cpu_flags = av_get_cpu_flags(); |
|
|
|
if (EXTERNAL_SSE3(cpu_flags)) |
|
s->postreindex = ff_mdct15_postreindex_sse3; |
|
|
|
if (ARCH_X86_64 && EXTERNAL_AVX(cpu_flags)) { |
|
s->fft15 = ff_fft15_avx; |
|
adjust_twiddles = 1; |
|
} |
|
|
|
if (ARCH_X86_64 && EXTERNAL_AVX2_FAST(cpu_flags)) |
|
s->postreindex = ff_mdct15_postreindex_avx2; |
|
|
|
if (adjust_twiddles) |
|
perm_twiddles(s); |
|
}
|
|
|