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/*
* Copyright (c) CMU 1993 Computer Science, Speech Group
* Chengxiang Lu and Alex Hauptmann
* Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
* Copyright (c) 2009 Kenan Gillet
* Copyright (c) 2010 Martin Storsjo
*
* 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 AVCODEC_G722_H
#define AVCODEC_G722_H
#include <stdint.h>
#include "avcodec.h"
#define PREV_SAMPLES_BUF_SIZE 1024
typedef struct G722Context {
const AVClass *class;
int bits_per_codeword;
int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples
int prev_samples_pos; ///< the number of values in prev_samples
/**
* The band[0] and band[1] correspond respectively to the lower band and higher band.
*/
struct G722Band {
int16_t s_predictor; ///< predictor output value
int32_t s_zero; ///< previous output signal from zero predictor
int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals
int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
int16_t pole_mem[2]; ///< second-order pole section coefficient buffer
int32_t diff_mem[6]; ///< quantizer difference signal memory
int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer
int16_t log_factor; ///< delayed 2-logarithmic quantizer factor
int16_t scale_factor; ///< delayed quantizer scale factor
} band[2];
struct TrellisNode {
struct G722Band state;
uint32_t ssd;
int path;
} *node_buf[2], **nodep_buf[2];
struct TrellisPath {
int value;
int prev;
} *paths[2];
} G722Context;
extern const int16_t ff_g722_high_inv_quant[4];
extern const int16_t ff_g722_low_inv_quant4[16];
extern const int16_t ff_g722_low_inv_quant6[64];
void ff_g722_update_low_predictor(struct G722Band *band, const int ilow);
void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh,
const int ihigh);
void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2);
#endif /* AVCODEC_G722_H */
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