mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
29eb1c51d7
Removes an unneeded copy and does the 5-point permute in-place. Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
/*
|
|
* 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 "config.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);
|
|
}
|