FFmpeg
sbr.h
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1 /*
2  * Spectral Band Replication definitions and structures
3  * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
4  * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * Spectral Band Replication definitions and structures
26  * @author Robert Swain ( rob opendot cl )
27  */
28 
29 #ifndef AVCODEC_SBR_H
30 #define AVCODEC_SBR_H
31 
32 #include <stdint.h>
33 
34 #include "libavutil/mem_internal.h"
35 
36 #include "fft.h"
37 #include "aacps.h"
38 #include "sbrdsp.h"
39 
40 typedef struct AACContext AACContext;
41 
42 /**
43  * Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the previous header.
44  */
45 typedef struct SpectrumParameters {
46  uint8_t bs_start_freq;
47  uint8_t bs_stop_freq;
48  uint8_t bs_xover_band;
49 
50  /**
51  * @name Variables associated with bs_header_extra_1
52  * @{
53  */
54  uint8_t bs_freq_scale;
55  uint8_t bs_alter_scale;
56  uint8_t bs_noise_bands;
57  /** @} */
59 
60 #define SBR_SYNTHESIS_BUF_SIZE ((1280-128)*2)
61 
62 /**
63  * Spectral Band Replication per channel data
64  */
65 typedef struct SBRData {
66  /**
67  * @name Main bitstream data variables
68  * @{
69  */
70  unsigned bs_frame_class;
73  uint8_t bs_freq_res[7];
75  uint8_t bs_df_env[5];
76  uint8_t bs_df_noise[2];
77  uint8_t bs_invf_mode[2][5];
78  uint8_t bs_add_harmonic[48];
79  unsigned bs_amp_res;
80  /** @} */
81 
82  /**
83  * @name State variables
84  * @{
85  */
89  ///l_APrev and l_A
90  int e_a[2];
91  ///Chirp factors
93  ///QMF values of the original signal
94  INTFLOAT W[2][32][32][2];
95  ///QMF output of the HF adjustor
96  int Ypos;
97  DECLARE_ALIGNED(16, INTFLOAT, Y)[2][38][64][2];
99  AAC_FLOAT q_temp[42][48];
100  uint8_t s_indexmapped[8][48];
101  ///Envelope scalefactors
102  uint8_t env_facs_q[6][48];
104  ///Noise scalefactors
105  uint8_t noise_facs_q[3][5];
107  ///Envelope time borders
108  uint8_t t_env[8];
109  ///Envelope time border of the last envelope of the previous frame
111  ///Noise time borders
112  uint8_t t_q[3];
113  unsigned f_indexnoise;
114  unsigned f_indexsine;
115  /** @} */
116 } SBRData;
117 
119 
120 /**
121  * aacsbr functions pointers
122  */
123 typedef struct AACSBRContext {
125  INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2],
126  int buf_idx);
127  void (*sbr_hf_assemble)(INTFLOAT Y1[38][64][2],
128  const INTFLOAT X_high[64][40][2],
129  SpectralBandReplication *sbr, SBRData *ch_data,
130  const int e_a[2]);
132  const INTFLOAT Y0[38][64][2], const INTFLOAT Y1[38][64][2],
133  const INTFLOAT X_low[32][40][2], int ch);
135  INTFLOAT (*alpha0)[2], INTFLOAT (*alpha1)[2],
136  const INTFLOAT X_low[32][40][2], int k0);
137 } AACSBRContext;
138 
139 /**
140  * Spectral Band Replication
141  */
144  int start;
146  int id_aac;
147  int reset;
150  /**
151  * @name Variables associated with bs_header_extra_2
152  * @{
153  */
158  /** @} */
159  unsigned bs_coupling;
160  AAC_SIGNE k[5]; ///< k0, k1, k2
161  ///kx', and kx respectively, kx is the first QMF subband where SBR is used.
162  ///kx' is its value from the previous frame
164  ///M' and M respectively, M is the number of QMF subbands that use SBR.
166  unsigned kx_and_m_pushed;
167  ///The number of frequency bands in f_master
171  ///N_Low and N_High respectively, the number of frequency bands for low and high resolution
173  ///Number of noise floor bands
175  ///Number of limiter bands
177  ///The master QMF frequency grouping
178  uint16_t f_master[49];
179  ///Frequency borders for low resolution SBR
180  uint16_t f_tablelow[25];
181  ///Frequency borders for high resolution SBR
182  uint16_t f_tablehigh[49];
183  ///Frequency borders for noise floors
184  uint16_t f_tablenoise[6];
185  ///Frequency borders for the limiter
186  uint16_t f_tablelim[30];
188  uint8_t patch_num_subbands[6];
190  ///QMF low frequency input to the HF generator
191  DECLARE_ALIGNED(16, INTFLOAT, X_low)[32][40][2];
192  ///QMF output of the HF generator
193  DECLARE_ALIGNED(16, INTFLOAT, X_high)[64][40][2];
194  ///QMF values of the reconstructed signal
195  DECLARE_ALIGNED(16, INTFLOAT, X)[2][2][38][64];
196  ///Zeroth coefficient used to filter the subband signals
198  ///First coefficient used to filter the subband signals
200  ///Dequantized envelope scalefactors, remapped
202  ///Dequantized noise scalefactors, remapped
204  ///Sinusoidal presence, remapped
205  uint8_t s_mapped[7][48];
206  ///Estimated envelope
208  ///Amplitude adjusted noise scalefactors
209  AAC_FLOAT q_m[7][48];
210  ///Sinusoidal levels
211  AAC_FLOAT s_m[7][48];
212  AAC_FLOAT gain[7][48];
218 };
219 
220 #endif /* AVCODEC_SBR_H */
SpectralBandReplication::bs_coupling
unsigned bs_coupling
Definition: sbr.h:159
INTFLOAT
#define INTFLOAT
Definition: dct32_template.c:44
W
@ W
Definition: vf_addroi.c:26
SpectralBandReplication::data
SBRData data[2]
Definition: sbr.h:169
SpectralBandReplication::bs_limiter_gains
unsigned bs_limiter_gains
Definition: sbr.h:155
mem_internal.h
SBRDSPContext
Definition: sbrdsp.h:28
SpectralBandReplication::e_origmapped
AAC_FLOAT e_origmapped[7][48]
Dequantized envelope scalefactors, remapped.
Definition: sbr.h:201
SBRData::env_facs
AAC_FLOAT env_facs[6][48]
Definition: sbr.h:103
X
@ X
Definition: vf_addroi.c:26
SpectralBandReplication::X
INTFLOAT X[2][2][38][64]
QMF values of the reconstructed signal.
Definition: sbr.h:195
AAC_SIGNE
unsigned AAC_SIGNE
Definition: aac_defines.h:91
SpectralBandReplication::m
AAC_SIGNE m[2]
M' and M respectively, M is the number of QMF subbands that use SBR.
Definition: sbr.h:165
SpectralBandReplication::mdct
FFTContext mdct
Definition: sbr.h:215
SpectralBandReplication::q_m
AAC_FLOAT q_m[7][48]
Amplitude adjusted noise scalefactors.
Definition: sbr.h:209
SBRData::t_env_num_env_old
uint8_t t_env_num_env_old
Envelope time border of the last envelope of the previous frame.
Definition: sbr.h:110
SpectrumParameters::bs_alter_scale
uint8_t bs_alter_scale
Definition: sbr.h:55
AACSBRContext::sbr_hf_assemble
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])
Definition: sbr.h:127
SpectrumParameters::bs_start_freq
uint8_t bs_start_freq
Definition: sbr.h:46
SBRData::t_env
uint8_t t_env[8]
Envelope time borders.
Definition: sbr.h:108
SpectralBandReplication::X_low
INTFLOAT X_low[32][40][2]
QMF low frequency input to the HF generator.
Definition: sbr.h:191
SpectralBandReplication::ready_for_dequant
int ready_for_dequant
Definition: sbr.h:145
SBRData::e_a
int e_a[2]
l_APrev and l_A
Definition: sbr.h:90
SBRData::analysis_filterbank_samples
INTFLOAT analysis_filterbank_samples[1312]
Definition: sbr.h:87
aacps.h
SpectralBandReplication::bs_interpol_freq
unsigned bs_interpol_freq
Definition: sbr.h:156
SpectralBandReplication::n_master
AAC_SIGNE n_master
The number of frequency bands in f_master.
Definition: sbr.h:168
SBRData::bs_add_harmonic_flag
unsigned bs_add_harmonic_flag
Definition: sbr.h:71
SpectralBandReplication::reset
int reset
Definition: sbr.h:147
SBRData::noise_facs
AAC_FLOAT noise_facs[3][5]
Definition: sbr.h:106
SpectrumParameters::bs_stop_freq
uint8_t bs_stop_freq
Definition: sbr.h:47
SpectralBandReplication::mdct_ana
FFTContext mdct_ana
Definition: sbr.h:214
SpectralBandReplication::qmf_filter_scratch
INTFLOAT qmf_filter_scratch[5][64]
Definition: sbr.h:213
SBRData::bs_df_noise
uint8_t bs_df_noise[2]
Definition: sbr.h:76
SBRData::bs_num_noise
AAC_SIGNE bs_num_noise
Definition: sbr.h:74
SpectrumParameters::bs_xover_band
uint8_t bs_xover_band
Definition: sbr.h:48
SpectralBandReplication::f_tablenoise
uint16_t f_tablenoise[6]
Frequency borders for noise floors.
Definition: sbr.h:184
SBRData::g_temp
AAC_FLOAT g_temp[42][48]
Definition: sbr.h:98
SpectralBandReplication::s_m
AAC_FLOAT s_m[7][48]
Sinusoidal levels.
Definition: sbr.h:211
AACSBRContext::sbr_x_gen
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)
Definition: sbr.h:131
SpectralBandReplication::n_lim
AAC_SIGNE n_lim
Number of limiter bands.
Definition: sbr.h:176
SBRData::Ypos
int Ypos
QMF output of the HF adjustor.
Definition: sbr.h:96
SBRData::env_facs_q
uint8_t env_facs_q[6][48]
Envelope scalefactors.
Definition: sbr.h:102
SpectralBandReplication::f_tablelow
uint16_t f_tablelow[25]
Frequency borders for low resolution SBR.
Definition: sbr.h:180
SBRData::f_indexnoise
unsigned f_indexnoise
Definition: sbr.h:113
SBRData::bs_df_env
uint8_t bs_df_env[5]
Definition: sbr.h:75
SpectrumParameters::bs_freq_scale
uint8_t bs_freq_scale
Definition: sbr.h:54
SpectralBandReplication::f_tablelim
uint16_t f_tablelim[30]
Frequency borders for the limiter.
Definition: sbr.h:186
SBRData::bs_add_harmonic
uint8_t bs_add_harmonic[48]
Definition: sbr.h:78
AACSBRContext
aacsbr functions pointers
Definition: sbr.h:123
SBR_SYNTHESIS_BUF_SIZE
#define SBR_SYNTHESIS_BUF_SIZE
Definition: sbr.h:60
SpectralBandReplication::n
AAC_SIGNE n[2]
N_Low and N_High respectively, the number of frequency bands for low and high resolution.
Definition: sbr.h:172
SBRData::bs_num_env
AAC_SIGNE bs_num_env
Definition: sbr.h:72
SBRData::bs_amp_res
unsigned bs_amp_res
Definition: sbr.h:79
SBRData::s_indexmapped
uint8_t s_indexmapped[8][48]
Definition: sbr.h:100
SpectralBandReplication::bs_smoothing_mode
unsigned bs_smoothing_mode
Definition: sbr.h:157
SpectrumParameters
Spectral Band Replication header - spectrum parameters that invoke a reset if they differ from the pr...
Definition: sbr.h:45
SpectralBandReplication::f_master
uint16_t f_master[49]
The master QMF frequency grouping.
Definition: sbr.h:178
SpectralBandReplication::sample_rate
int sample_rate
Definition: sbr.h:143
sbrdsp.h
SpectralBandReplication::gain
AAC_FLOAT gain[7][48]
Definition: sbr.h:212
SpectralBandReplication
Spectral Band Replication.
Definition: sbr.h:142
SpectralBandReplication::alpha0
INTFLOAT alpha0[64][2]
Zeroth coefficient used to filter the subband signals.
Definition: sbr.h:197
SpectralBandReplication::c
AACSBRContext c
Definition: sbr.h:217
SpectralBandReplication::bs_amp_res_header
int bs_amp_res_header
Definition: sbr.h:149
SBRData::bs_invf_mode
uint8_t bs_invf_mode[2][5]
Definition: sbr.h:77
SpectralBandReplication::alpha1
INTFLOAT alpha1[64][2]
First coefficient used to filter the subband signals.
Definition: sbr.h:199
SBRData::bs_freq_res
uint8_t bs_freq_res[7]
Definition: sbr.h:73
SBRData::Y
INTFLOAT Y[2][38][64][2]
Definition: sbr.h:97
SpectralBandReplication::n_q
AAC_SIGNE n_q
Number of noise floor bands.
Definition: sbr.h:174
SpectralBandReplication::patch_start_subband
uint8_t patch_start_subband[6]
Definition: sbr.h:189
AACSBRContext::sbr_hf_inverse_filter
void(* sbr_hf_inverse_filter)(SBRDSPContext *dsp, INTFLOAT(*alpha0)[2], INTFLOAT(*alpha1)[2], const INTFLOAT X_low[32][40][2], int k0)
Definition: sbr.h:134
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:116
SpectralBandReplication::e_curr
AAC_FLOAT e_curr[7][48]
Estimated envelope.
Definition: sbr.h:207
SpectralBandReplication::id_aac
int id_aac
Definition: sbr.h:146
FFTContext
Definition: fft.h:75
SBRData
Spectral Band Replication per channel data.
Definition: sbr.h:65
PSContext
Definition: aacps.h:72
SBRData::bw_array
INTFLOAT bw_array[5]
Chirp factors.
Definition: sbr.h:92
SpectralBandReplication::k
AAC_SIGNE k[5]
k0, k1, k2
Definition: sbr.h:160
SpectralBandReplication::X_high
INTFLOAT X_high[64][40][2]
QMF output of the HF generator.
Definition: sbr.h:193
SBRData::f_indexsine
unsigned f_indexsine
Definition: sbr.h:114
SBRData::bs_frame_class
unsigned bs_frame_class
Definition: sbr.h:70
SpectralBandReplication::kx_and_m_pushed
unsigned kx_and_m_pushed
Definition: sbr.h:166
SBRData::W
INTFLOAT W[2][32][32][2]
QMF values of the original signal.
Definition: sbr.h:94
SBRData::q_temp
AAC_FLOAT q_temp[42][48]
Definition: sbr.h:99
AACSBRContext::sbr_lf_gen
int(* sbr_lf_gen)(AACContext *ac, SpectralBandReplication *sbr, INTFLOAT X_low[32][40][2], const INTFLOAT W[2][32][32][2], int buf_idx)
Definition: sbr.h:124
fft.h
SBRData::t_q
uint8_t t_q[3]
Noise time borders.
Definition: sbr.h:112
SpectralBandReplication::spectrum_params
SpectrumParameters spectrum_params
Definition: sbr.h:148
SpectralBandReplication::f_tablehigh
uint16_t f_tablehigh[49]
Frequency borders for high resolution SBR.
Definition: sbr.h:182
SBRData::noise_facs_q
uint8_t noise_facs_q[3][5]
Noise scalefactors.
Definition: sbr.h:105
SBRData::synthesis_filterbank_samples
INTFLOAT synthesis_filterbank_samples[SBR_SYNTHESIS_BUF_SIZE]
Definition: sbr.h:86
SpectralBandReplication::bs_limiter_bands
unsigned bs_limiter_bands
Definition: sbr.h:154
SpectralBandReplication::patch_num_subbands
uint8_t patch_num_subbands[6]
Definition: sbr.h:188
SpectralBandReplication::start
int start
Definition: sbr.h:144
AAC_FLOAT
float AAC_FLOAT
Definition: aac_defines.h:90
SpectrumParameters::bs_noise_bands
uint8_t bs_noise_bands
Definition: sbr.h:56
AACContext
main AAC context
Definition: aac.h:294
SpectralBandReplication::q_mapped
AAC_FLOAT q_mapped[7][48]
Dequantized noise scalefactors, remapped.
Definition: sbr.h:203
SBRData::synthesis_filterbank_samples_offset
int synthesis_filterbank_samples_offset
Definition: sbr.h:88
int
int
Definition: ffmpeg_filter.c:156
SpectralBandReplication::kx
AAC_SIGNE kx[2]
kx', and kx respectively, kx is the first QMF subband where SBR is used.
Definition: sbr.h:163
INTFLOAT
float INTFLOAT
Definition: aac_defines.h:86
SpectralBandReplication::s_mapped
uint8_t s_mapped[7][48]
Sinusoidal presence, remapped.
Definition: sbr.h:205
SpectralBandReplication::ps
PSContext ps
Definition: sbr.h:170
SpectralBandReplication::num_patches
AAC_SIGNE num_patches
Definition: sbr.h:187
SpectralBandReplication::dsp
SBRDSPContext dsp
Definition: sbr.h:216