1/*
2 * SIPR / ACELP.NET decoder
3 *
4 * Copyright (c) 2008 Vladimir Voroshilov
5 * Copyright (c) 2009 Vitor Sessak
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef AVCODEC_SIPR_H
25#define AVCODEC_SIPR_H
26
27#include "avcodec.h"
28#include "acelp_pitch_delay.h"
29#include "libavutil/mem.h"
30
31#define LP_FILTER_ORDER_16k  16
32#define L_SUBFR_16k          80
33#define PITCH_MIN            30
34#define PITCH_MAX            281
35
36#define LSFQ_DIFF_MIN        (0.0125 * M_PI)
37
38#define LP_FILTER_ORDER      10
39
40/** Number of past samples needed for excitation interpolation */
41#define L_INTERPOL           (LP_FILTER_ORDER + 1)
42
43/**  Subframe size for all modes except 16k */
44#define SUBFR_SIZE           48
45
46#define SUBFRAME_COUNT_16k   2
47
48typedef enum {
49    MODE_16k,
50    MODE_8k5,
51    MODE_6k5,
52    MODE_5k0,
53    MODE_COUNT
54} SiprMode;
55
56typedef struct SiprParameters {
57    int ma_pred_switch;        ///< switched moving average predictor
58    int vq_indexes[5];
59    int pitch_delay[5];        ///< pitch delay
60    int gp_index[5];           ///< adaptive-codebook gain indexes
61    int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
62    int gc_index[5];           ///< fixed-codebook gain indexes
63} SiprParameters;
64
65typedef struct SiprContext {
66    AVCodecContext *avctx;
67
68    SiprMode mode;
69
70    float past_pitch_gain;
71    float lsf_history[LP_FILTER_ORDER_16k];
72
73    float excitation[L_INTERPOL + PITCH_MAX + 2 * L_SUBFR_16k];
74
75    DECLARE_ALIGNED(16, float, synth_buf)[LP_FILTER_ORDER + 5*SUBFR_SIZE + 6];
76
77    float lsp_history[LP_FILTER_ORDER];
78    float gain_mem;
79    float energy_history[4];
80    float highpass_filt_mem[2];
81    float postfilter_mem[PITCH_DELAY_MAX + LP_FILTER_ORDER];
82
83    /* 5k0 */
84    float tilt_mem;
85    float postfilter_agc;
86    float postfilter_mem5k0[PITCH_DELAY_MAX + LP_FILTER_ORDER];
87    float postfilter_syn5k0[LP_FILTER_ORDER + SUBFR_SIZE*5];
88
89    /* 16k */
90    int pitch_lag_prev;
91    float iir_mem[LP_FILTER_ORDER_16k+1];
92    float filt_buf[2][LP_FILTER_ORDER_16k+1];
93    float *filt_mem[2];
94    float mem_preemph[LP_FILTER_ORDER_16k];
95    float synth[LP_FILTER_ORDER_16k];
96    double lsp_history_16k[16];
97
98    void (*decode_frame)(struct SiprContext *ctx, SiprParameters *params,
99                         float *out_data);
100} SiprContext;
101
102extern const float ff_pow_0_5[16];
103
104void ff_sipr_init_16k(SiprContext *ctx);
105
106void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
107                              float *out_data);
108
109#endif /* AVCODEC_SIPR_H */
110