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/*
* Copyright (c) 2012 Clément Bœsch
* Copyright (c) 2025 Niklas Haas
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVFILTER_F_EBUR128_H
#define AVFILTER_F_EBUR128_H
#include <assert.h>
#include <stddef.h>
typedef struct EBUR128Biquad {
double b0, b1, b2;
double a1, a2;
} EBUR128Biquad;
typedef struct EBUR128DSPContext {
/* Filter data */
EBUR128Biquad pre;
EBUR128Biquad rlb;
/* Cache of 3 samples for each channel */
double *y; /* after pre-filter */
double *z; /* after RLB-filter */
/* DSP functions */
void (*filter_channels)(const struct EBUR128DSPContext *dsp,
const double *samples,
double *cache_400, double *cache_3000,
double *sum_400, double *sum_3000,
int nb_channels);
/* Updates ch_peaks[] and returns maximum from all channels */
double (*find_peak)(double *ch_peaks, int nb_channels,
const double *samples, int nb_samples);
} EBUR128DSPContext;
static_assert(offsetof(EBUR128DSPContext, pre) == 0, "struct layout mismatch");
static_assert(offsetof(EBUR128DSPContext, rlb) == 5 * sizeof(double), "struct layout mismatch");
static_assert(offsetof(EBUR128DSPContext, y) == 10 * sizeof(double), "struct layout mismatch");
void ff_ebur128_init_x86(EBUR128DSPContext *dsp, int nb_channels);
void ff_ebur128_filter_channels_c(const EBUR128DSPContext *, const double *,
double *, double *, double *, double *, int);
double ff_ebur128_find_peak_c(double *, int, const double *, int);
#endif /* AVFILTER_F_EBUR128_H */
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