libavcodec/g729postfilter.h

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/*
 * G.729, G729 Annex D postfilter
 * Copyright (c) 2008 Vladimir Voroshilov
 *
 * 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 FFMPEG_G729POSTFILTER_H
#define FFMPEG_G729POSTFILTER_H

#include <stdint.h>

#define G729_TILT_FACTOR_PLUS       6554

#define G729_TILT_FACTOR_MINUS     29491

/* 4.2.2 */
#define FORMANT_PP_FACTOR_NUM  18022             //0.55 in Q15
#define FORMANT_PP_FACTOR_DEN  22938             //0.70 in Q15

#define G729_AGC_FACTOR            32358
#define G729_AGC_FAC1 (32768-G729_AGC_FACTOR)

#define MIN_LT_FILT_FACTOR_A       21845

#define SHORT_INT_FILT_LEN         2

#define LONG_INT_FILT_LEN          8

#define ANALYZED_FRAC_DELAYS       7

#define RES_PREV_DATA_SIZE (PITCH_DELAY_MAX + LONG_INT_FILT_LEN + 1)

void ff_g729_postfilter(DSPContext *dsp, int16_t* ht_prev_data, int* voicing,
                     const int16_t *lp_filter_coeffs, int pitch_delay_int,
                     int16_t* residual, int16_t* res_filter_data,
                     int16_t* pos_filter_data, int16_t *speech,
                     int subframe_size);

int16_t ff_g729_adaptive_gain_control(int gain_before, int gain_after, int16_t *speech,
                                   int subframe_size, int16_t gain_prev);

#endif // FFMPEG_G729POSTFILTER_H

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