FFmpeg/libavfilter/f_ebur128.h

/*
 * 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

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 */
} EBUR128DSPContext;

void ff_ebur128_filter_channels_c(const EBUR128DSPContext *, const double *,
                                  double *, double *, double *, double *, int);

#endif /* AVFILTER_F_EBUR128_H */