GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mdct_fixed.c Lines: 29 29 100.0 %
Date: 2019-11-22 03:34:36 Branches: 4 4 100.0 %

Line Branch Exec Source
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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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#define FFT_FLOAT 0
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#define FFT_FIXED_32 0
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#include "mdct_template.c"
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/* same as ff_mdct_calcw_c with double-width unscaled output */
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void ff_mdct_calcw_c(FFTContext *s, FFTDouble *out, const FFTSample *input)
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{
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    int i, j, n, n8, n4, n2, n3;
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    FFTDouble re, im;
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    const uint16_t *revtab = s->revtab;
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    const FFTSample *tcos = s->tcos;
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    const FFTSample *tsin = s->tsin;
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    FFTComplex *x = s->tmp_buf;
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    FFTDComplex *o = (FFTDComplex *)out;
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    n = 1 << s->mdct_bits;
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    n2 = n >> 1;
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    n4 = n >> 2;
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    n8 = n >> 3;
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    n3 = 3 * n4;
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    /* pre rotation */
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    for(i=0;i<n8;i++) {
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        re = RSCALE(-input[2*i+n3], - input[n3-1-2*i]);
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        im = RSCALE(-input[n4+2*i], + input[n4-1-2*i]);
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        j = revtab[i];
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        CMUL(x[j].re, x[j].im, re, im, -tcos[i], tsin[i]);
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        re = RSCALE( input[2*i]   , - input[n2-1-2*i]);
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        im = RSCALE(-input[n2+2*i], - input[ n-1-2*i]);
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        j = revtab[n8 + i];
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        CMUL(x[j].re, x[j].im, re, im, -tcos[n8 + i], tsin[n8 + i]);
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    }
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    s->fft_calc(s, x);
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    /* post rotation */
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    for(i=0;i<n8;i++) {
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        FFTDouble r0, i0, r1, i1;
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        CMULL(i1, r0, x[n8-i-1].re, x[n8-i-1].im, -tsin[n8-i-1], -tcos[n8-i-1]);
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        CMULL(i0, r1, x[n8+i  ].re, x[n8+i  ].im, -tsin[n8+i  ], -tcos[n8+i  ]);
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        o[n8-i-1].re = r0;
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        o[n8-i-1].im = i0;
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        o[n8+i  ].re = r1;
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        o[n8+i  ].im = i1;
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    }
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}