GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/x86/mdct15_init.c Lines: 44 44 100.0 %
Date: 2020-10-23 17:01:47 Branches: 15 16 93.8 %

Line Branch Exec Source
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/*
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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 tmp[30];
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    /* 5-point FFT twiddles */
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    s->exptab[60].re = s->exptab[60].im = s->exptab[19].re;
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    s->exptab[61].re = s->exptab[61].im = s->exptab[19].im;
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    s->exptab[62].re = s->exptab[62].im = s->exptab[20].re;
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    s->exptab[63].re = s->exptab[63].im = s->exptab[20].im;
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    /* 15-point FFT twiddles */
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672
    for (k = 0; k < 5; k++) {
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        tmp[6*k + 0] = s->exptab[k +  0];
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        tmp[6*k + 2] = s->exptab[k +  5];
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        tmp[6*k + 4] = s->exptab[k + 10];
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        tmp[6*k + 1] = s->exptab[2 * (k + 0)];
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        tmp[6*k + 3] = s->exptab[2 * (k + 5)];
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        tmp[6*k + 5] = s->exptab[2 *  k + 5 ];
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    }
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    for (k = 0; k < 6; k++) {
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672
        FFTComplex ac_exp[] = {
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            { tmp[6*1 + k].re,  tmp[6*1 + k].re },
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            { tmp[6*2 + k].re,  tmp[6*2 + k].re },
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            { tmp[6*3 + k].re,  tmp[6*3 + k].re },
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672
            { tmp[6*4 + k].re,  tmp[6*4 + k].re },
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            { tmp[6*1 + k].im, -tmp[6*1 + k].im },
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            { tmp[6*2 + k].im, -tmp[6*2 + k].im },
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            { tmp[6*3 + k].im, -tmp[6*3 + k].im },
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            { tmp[6*4 + k].im, -tmp[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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            { tmp[2*k + 0].re, -tmp[2*k + 0].im },
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            { tmp[2*k + 0].im,  tmp[2*k + 0].re },
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            { tmp[2*k + 1].re, -tmp[2*k + 1].im },
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            { tmp[2*k + 1].im,  tmp[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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}
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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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}