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104 lines
3.4 KiB
104 lines
3.4 KiB
/* |
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* SIMD optimized non-power-of-two MDCT functions |
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* |
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* Copyright (C) 2017 Rostislav Pehlivanov <atomnuker@gmail.com> |
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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 "config.h" |
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#include "libavutil/x86/cpu.h" |
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#include "libavcodec/mdct15.h" |
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void ff_mdct15_postreindex_sse3(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); |
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void ff_mdct15_postreindex_avx2(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8); |
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void ff_fft15_avx(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride); |
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static void perm_twiddles(MDCT15Context *s) |
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{ |
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int k; |
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FFTComplex exp_5point[4]; |
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FFTComplex tmp[21], tmp2[30]; |
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memcpy(tmp, s->exptab, sizeof(FFTComplex)*21); |
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/* 15-point FFT twiddles */ |
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for (k = 0; k < 5; k++) { |
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tmp2[6*k + 0] = tmp[k + 0]; |
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tmp2[6*k + 2] = tmp[k + 5]; |
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tmp2[6*k + 4] = tmp[k + 10]; |
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tmp2[6*k + 1] = tmp[2 * (k + 0)]; |
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tmp2[6*k + 3] = tmp[2 * (k + 5)]; |
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tmp2[6*k + 5] = tmp[2 * k + 5 ]; |
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} |
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for (k = 0; k < 6; k++) { |
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FFTComplex ac_exp[] = { |
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{ tmp2[6*1 + k].re, tmp2[6*1 + k].re }, |
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{ tmp2[6*2 + k].re, tmp2[6*2 + k].re }, |
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{ tmp2[6*3 + k].re, tmp2[6*3 + k].re }, |
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{ tmp2[6*4 + k].re, tmp2[6*4 + k].re }, |
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{ tmp2[6*1 + k].im, -tmp2[6*1 + k].im }, |
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{ tmp2[6*2 + k].im, -tmp2[6*2 + k].im }, |
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{ tmp2[6*3 + k].im, -tmp2[6*3 + k].im }, |
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{ tmp2[6*4 + k].im, -tmp2[6*4 + k].im }, |
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}; |
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memcpy(s->exptab + 8*k, ac_exp, 8*sizeof(FFTComplex)); |
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} |
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/* Specialcase when k = 0 */ |
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for (k = 0; k < 3; k++) { |
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FFTComplex dc_exp[] = { |
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{ tmp2[2*k + 0].re, -tmp2[2*k + 0].im }, |
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{ tmp2[2*k + 0].im, tmp2[2*k + 0].re }, |
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{ tmp2[2*k + 1].re, -tmp2[2*k + 1].im }, |
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{ tmp2[2*k + 1].im, tmp2[2*k + 1].re }, |
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}; |
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memcpy(s->exptab + 8*6 + 4*k, dc_exp, 4*sizeof(FFTComplex)); |
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} |
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/* 5-point FFT twiddles */ |
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exp_5point[0].re = exp_5point[0].im = tmp[19].re; |
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exp_5point[1].re = exp_5point[1].im = tmp[19].im; |
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exp_5point[2].re = exp_5point[2].im = tmp[20].re; |
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exp_5point[3].re = exp_5point[3].im = tmp[20].im; |
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memcpy(s->exptab + 8*6 + 4*3, exp_5point, 4*sizeof(FFTComplex)); |
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} |
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av_cold void ff_mdct15_init_x86(MDCT15Context *s) |
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{ |
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int adjust_twiddles = 0; |
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int cpu_flags = av_get_cpu_flags(); |
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if (EXTERNAL_SSE3(cpu_flags)) |
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s->postreindex = ff_mdct15_postreindex_sse3; |
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if (ARCH_X86_64 && EXTERNAL_AVX(cpu_flags)) { |
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s->fft15 = ff_fft15_avx; |
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adjust_twiddles = 1; |
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} |
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if (ARCH_X86_64 && EXTERNAL_AVX2_FAST(cpu_flags)) |
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s->postreindex = ff_mdct15_postreindex_avx2; |
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if (adjust_twiddles) |
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perm_twiddles(s); |
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}
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