blob: 34f7f994cdee074f8eada0592a6f7c6d1dfa38d8
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 | |
48 | typedef enum { |
49 | MODE_16k, |
50 | MODE_8k5, |
51 | MODE_6k5, |
52 | MODE_5k0, |
53 | MODE_COUNT |
54 | } SiprMode; |
55 | |
56 | typedef 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 | |
65 | typedef 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 | |
102 | extern const float ff_pow_0_5[16]; |
103 | |
104 | void ff_sipr_init_16k(SiprContext *ctx); |
105 | |
106 | void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params, |
107 | float *out_data); |
108 | |
109 | #endif /* AVCODEC_SIPR_H */ |
110 |