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66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/*
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* Copyright (c) 2012 Clément Bœsch
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* Copyright (c) 2025 Niklas Haas
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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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#ifndef AVFILTER_F_EBUR128_H
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#define AVFILTER_F_EBUR128_H
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#include <assert.h>
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#include <stddef.h>
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typedef struct EBUR128Biquad {
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double b0, b1, b2;
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double a1, a2;
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} EBUR128Biquad;
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typedef struct EBUR128DSPContext {
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/* Filter data */
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EBUR128Biquad pre;
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EBUR128Biquad rlb;
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/* Cache of 3 samples for each channel */
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double *y; /* after pre-filter */
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double *z; /* after RLB-filter */
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/* DSP functions */
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void (*filter_channels)(const struct EBUR128DSPContext *dsp,
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const double *samples,
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double *cache_400, double *cache_3000,
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double *sum_400, double *sum_3000,
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int nb_channels);
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/* Updates ch_peaks[] and returns maximum from all channels */
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double (*find_peak)(double *ch_peaks, int nb_channels,
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const double *samples, int nb_samples);
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} EBUR128DSPContext;
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static_assert(offsetof(EBUR128DSPContext, pre) == 0, "struct layout mismatch");
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static_assert(offsetof(EBUR128DSPContext, rlb) == 5 * sizeof(double), "struct layout mismatch");
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static_assert(offsetof(EBUR128DSPContext, y) == 10 * sizeof(double), "struct layout mismatch");
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void ff_ebur128_init_x86(EBUR128DSPContext *dsp, int nb_channels);
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void ff_ebur128_filter_channels_c(const EBUR128DSPContext *, const double *,
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double *, double *, double *, double *, int);
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double ff_ebur128_find_peak_c(double *, int, const double *, int);
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#endif /* AVFILTER_F_EBUR128_H */
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