1/*
2 * Copyright (c) CMU 1993 Computer Science, Speech Group
3 *                        Chengxiang Lu and Alex Hauptmann
4 * Copyright (c) 2005 Steve Underwood <steveu at coppice.org>
5 * Copyright (c) 2009 Kenan Gillet
6 * Copyright (c) 2010 Martin Storsjo
7 *
8 * This file is part of Libav.
9 *
10 * Libav is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * Libav is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with Libav; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#ifndef AVCODEC_G722_H
26#define AVCODEC_G722_H
27
28#include <stdint.h>
29#include "avcodec.h"
30
31#define PREV_SAMPLES_BUF_SIZE 1024
32
33typedef struct {
34    const AVClass *class;
35    AVFrame frame;
36    int     bits_per_codeword;
37    int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples
38    int     prev_samples_pos;        ///< the number of values in prev_samples
39
40    /**
41     * The band[0] and band[1] correspond respectively to the lower band and higher band.
42     */
43    struct G722Band {
44        int16_t s_predictor;         ///< predictor output value
45        int32_t s_zero;              ///< previous output signal from zero predictor
46        int8_t  part_reconst_mem[2]; ///< signs of previous partially reconstructed signals
47        int16_t prev_qtzd_reconst;   ///< previous quantized reconstructed signal (internal value, using low_inv_quant4)
48        int16_t pole_mem[2];         ///< second-order pole section coefficient buffer
49        int32_t diff_mem[6];         ///< quantizer difference signal memory
50        int16_t zero_mem[6];         ///< Seventh-order zero section coefficient buffer
51        int16_t log_factor;          ///< delayed 2-logarithmic quantizer factor
52        int16_t scale_factor;        ///< delayed quantizer scale factor
53    } band[2];
54
55    struct TrellisNode {
56        struct G722Band state;
57        uint32_t ssd;
58        int path;
59    } *node_buf[2], **nodep_buf[2];
60
61    struct TrellisPath {
62        int value;
63        int prev;
64    } *paths[2];
65} G722Context;
66
67extern const int16_t ff_g722_high_inv_quant[4];
68extern const int16_t ff_g722_low_inv_quant4[16];
69extern const int16_t ff_g722_low_inv_quant6[64];
70
71void ff_g722_update_low_predictor(struct G722Band *band, const int ilow);
72
73void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh,
74                                   const int ihigh);
75
76void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2);
77
78#endif /* AVCODEC_G722_H */
79