1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
/*
* Spectral Band Replication definitions and structures
* Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
* Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
*
* 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
*/
/**
* @file
* Spectral Band Replication definitions and structures
* @author Robert Swain ( rob opendot cl )
*/
#ifndef AVCODEC_SBR_H
#define AVCODEC_SBR_H
#include <stdint.h>
#include "libavutil/mem_internal.h"
#include "libavutil/tx.h"
#include "aacps.h"
#include "sbrdsp.h"
typedef struct AACContext AACContext;
/**
* Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
*/
typedef struct SpectrumParameters {
uint8_t bs_start_freq;
uint8_t bs_stop_freq;
uint8_t bs_xover_band;
/**
* @name Variables associated with bs_header_extra_1
* @{
*/
uint8_t bs_freq_scale;
uint8_t bs_alter_scale;
uint8_t bs_noise_bands;
/** @} */
} SpectrumParameters;
#define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
/**
* Spectral Band Replication per channel data
*/
typedef struct SBRData {
/**
* @name Main bitstream data variables
* @{
*/
unsigned bs_frame_class;
unsigned bs_add_harmonic_flag;
AAC_SIGNE bs_num_env;
uint8_t bs_freq_res[7];
AAC_SIGNE bs_num_noise;
uint8_t bs_df_env[5];
uint8_t bs_df_noise[2];
uint8_t bs_invf_mode[2][5];
uint8_t bs_add_harmonic[48];
unsigned bs_amp_res;
/** @} */
/**
* @name State variables
* @{
*/
DECLARE_ALIGNED(32, INTFLOAT, synthesis_filterbank_samples)[SBR_SYNTHESIS_BUF_SIZE];
DECLARE_ALIGNED(32, INTFLOAT, analysis_filterbank_samples) [1312];
int synthesis_filterbank_samples_offset;
///l_APrev and l_A
int e_a[2];
///Chirp factors
INTFLOAT bw_array[5];
///QMF values of the original signal
INTFLOAT W[2][32][32][2];
///QMF output of the HF adjustor
int Ypos;
DECLARE_ALIGNED(16, INTFLOAT, Y)[2][38][64][2];
DECLARE_ALIGNED(16, AAC_FLOAT, g_temp)[42][48];
AAC_FLOAT q_temp[42][48];
uint8_t s_indexmapped[8][48];
///Envelope scalefactors
uint8_t env_facs_q[6][48];
AAC_FLOAT env_facs[6][48];
///Noise scalefactors
uint8_t noise_facs_q[3][5];
AAC_FLOAT noise_facs[3][5];
///Envelope time borders
uint8_t t_env[8];
///Envelope time border of the last envelope of the previous frame
uint8_t t_env_num_env_old;
///Noise time borders
uint8_t t_q[3];
unsigned f_indexnoise;
unsigned f_indexsine;
/** @} */
} SBRData;
typedef struct SpectralBandReplication SpectralBandReplication;
/**
* aacsbr functions pointers
*/
typedef struct AACSBRContext {
int (*sbr_lf_gen)(AACContext *ac, SpectralBandReplication *sbr,
INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2],
int buf_idx);
void (*sbr_hf_assemble)(INTFLOAT Y1[38][64][2],
const INTFLOAT X_high[64][40][2],
SpectralBandReplication *sbr, SBRData *ch_data,
const int e_a[2]);
int (*sbr_x_gen)(SpectralBandReplication *sbr, INTFLOAT X[2][38][64],
const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2],
const INTFLOAT X_low[32][40][2], int ch);
void (*sbr_hf_inverse_filter)(SBRDSPContext *dsp,
INTFLOAT (*alpha0)[2], INTFLOAT (*alpha1)[2],
const INTFLOAT X_low[32][40][2], int k0);
} AACSBRContext;
/**
* Spectral Band Replication
*/
struct SpectralBandReplication {
int sample_rate;
int start;
int ready_for_dequant;
int id_aac;
int reset;
SpectrumParameters spectrum_params;
int bs_amp_res_header;
/**
* @name Variables associated with bs_header_extra_2
* @{
*/
unsigned bs_limiter_bands;
unsigned bs_limiter_gains;
unsigned bs_interpol_freq;
unsigned bs_smoothing_mode;
/** @} */
unsigned bs_coupling;
AAC_SIGNE k[5]; ///< k0, k1, k2
///kx', and kx respectively, kx is the first QMF subband where SBR is used.
///kx' is its value from the previous frame
AAC_SIGNE kx[2];
///M' and M respectively, M is the number of QMF subbands that use SBR.
AAC_SIGNE m[2];
unsigned kx_and_m_pushed;
///The number of frequency bands in f_master
AAC_SIGNE n_master;
SBRData data[2];
PSContext ps;
///N_Low and N_High respectively, the number of frequency bands for low and high resolution
AAC_SIGNE n[2];
///Number of noise floor bands
AAC_SIGNE n_q;
///Number of limiter bands
AAC_SIGNE n_lim;
///The master QMF frequency grouping
uint16_t f_master[49];
///Frequency borders for low resolution SBR
uint16_t f_tablelow[25];
///Frequency borders for high resolution SBR
uint16_t f_tablehigh[49];
///Frequency borders for noise floors
uint16_t f_tablenoise[6];
///Frequency borders for the limiter
uint16_t f_tablelim[30];
AAC_SIGNE num_patches;
uint8_t patch_num_subbands[6];
uint8_t patch_start_subband[6];
///QMF low frequency input to the HF generator
DECLARE_ALIGNED(16, INTFLOAT, X_low)[32][40][2];
///QMF output of the HF generator
DECLARE_ALIGNED(16, INTFLOAT, X_high)[64][40][2];
///QMF values of the reconstructed signal
DECLARE_ALIGNED(16, INTFLOAT, X)[2][2][38][64];
///Zeroth coefficient used to filter the subband signals
DECLARE_ALIGNED(16, INTFLOAT, alpha0)[64][2];
///First coefficient used to filter the subband signals
DECLARE_ALIGNED(16, INTFLOAT, alpha1)[64][2];
///Dequantized envelope scalefactors, remapped
AAC_FLOAT e_origmapped[7][48];
///Dequantized noise scalefactors, remapped
AAC_FLOAT q_mapped[7][48];
///Sinusoidal presence, remapped
uint8_t s_mapped[7][48];
///Estimated envelope
AAC_FLOAT e_curr[7][48];
///Amplitude adjusted noise scalefactors
AAC_FLOAT q_m[7][48];
///Sinusoidal levels
AAC_FLOAT s_m[7][48];
AAC_FLOAT gain[7][48];
DECLARE_ALIGNED(32, INTFLOAT, qmf_filter_scratch)[5][64];
AVTXContext *mdct_ana;
av_tx_fn mdct_ana_fn;
AVTXContext *mdct;
av_tx_fn mdct_fn;
SBRDSPContext dsp;
AACSBRContext c;
};
#endif /* AVCODEC_SBR_H */
|
