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ffmpeg / libavcodec / fft-internal.h @ 7087ce08

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/*
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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#ifndef AVCODEC_FFT_INTERNAL_H
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#define AVCODEC_FFT_INTERNAL_H
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#if CONFIG_FFT_FLOAT
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#define FIX15(v) (v)
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#define sqrthalf (float)M_SQRT1_2
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#define BF(x, y, a, b) do {                     \
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        x = a - b;                              \
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        y = a + b;                              \
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    } while (0)
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#define CMUL(dre, dim, are, aim, bre, bim) do { \
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        (dre) = (are) * (bre) - (aim) * (bim);  \
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        (dim) = (are) * (bim) + (aim) * (bre);  \
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    } while (0)
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#else
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#include "libavutil/intmath.h"
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#include "mathops.h"
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#define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
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#define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767)
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#define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2))
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#define BF(x, y, a, b) do {                     \
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        x = (a - b) >> 1;                       \
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        y = (a + b) >> 1;                       \
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    } while (0)
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#define CMUL(dre, dim, are, aim, bre, bim) do {                 \
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        (dre) = (MUL16(are, bre) - MUL16(aim, bim)) >> 15;      \
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        (dim) = (MUL16(are, bim) + MUL16(aim, bre)) >> 15;      \
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    } while (0)
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#endif /* CONFIG_FFT_FLOAT */
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#define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c)
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#define ff_imdct_half_c FFT_NAME(ff_imdct_half_c)
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#define ff_mdct_calc_c  FFT_NAME(ff_mdct_calc_c)
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void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
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void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
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void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
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#endif /* AVCODEC_FFT_INTERNAL_H */