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 "dsputil.h"
29#include "acelp_pitch_delay.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 {
57    AVCodecContext *avctx;
58    DSPContext dsp;
59
60    SiprMode mode;
61
62    float past_pitch_gain;
63    float lsf_history[LP_FILTER_ORDER_16k];
64
65    float excitation[L_INTERPOL + PITCH_MAX + 2 * L_SUBFR_16k];
66
67    DECLARE_ALIGNED(16, float, synth_buf)[LP_FILTER_ORDER + 5*SUBFR_SIZE + 6];
68
69    float lsp_history[LP_FILTER_ORDER];
70    float gain_mem;
71    float energy_history[4];
72    float highpass_filt_mem[2];
73    float postfilter_mem[PITCH_DELAY_MAX + LP_FILTER_ORDER];
74
75    /* 5k0 */
76    float tilt_mem;
77    float postfilter_agc;
78    float postfilter_mem5k0[PITCH_DELAY_MAX + LP_FILTER_ORDER];
79    float postfilter_syn5k0[LP_FILTER_ORDER + SUBFR_SIZE*5];
80
81    /* 16k */
82    int pitch_lag_prev;
83    float iir_mem[LP_FILTER_ORDER_16k+1];
84    float filt_buf[2][LP_FILTER_ORDER_16k+1];
85    float *filt_mem[2];
86    float mem_preemph[LP_FILTER_ORDER_16k];
87    float synth[LP_FILTER_ORDER_16k];
88    double lsp_history_16k[16];
89} SiprContext;
90
91typedef struct {
92    int ma_pred_switch;        ///< switched moving average predictor
93    int vq_indexes[5];
94    int pitch_delay[5];        ///< pitch delay
95    int gp_index[5];           ///< adaptive-codebook gain indexes
96    int16_t fc_indexes[5][10]; ///< fixed-codebook indexes
97    int gc_index[5];           ///< fixed-codebook gain indexes
98} SiprParameters;
99
100extern const float ff_pow_0_5[16];
101
102void ff_sipr_init_16k(SiprContext *ctx);
103
104void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
105                              float *out_data);
106
107#endif /* AVCODEC_SIPR_H */
108