Spectral Band Replication. More...

#include <sbr.h>

Data Fields
int	sample_rate

int	start

int	reset

SpectrumParameters	spectrum_params

int	bs_amp_res_header

unsigned	bs_coupling

unsigned	k [5]
	k0, k1, k2

unsigned	kx [2]
	kx', and kx respectively, kx is the first QMF subband where SBR is used.

unsigned	m [2]
	M' and M respectively, M is the number of QMF subbands that use SBR.

unsigned	kx_and_m_pushed

unsigned	n_master
	The number of frequency bands in f_master.

SBRData	data [2]

PSContext	ps

unsigned	n [2]
	N_Low and N_High respectively, the number of frequency bands for low and high resolution.

unsigned	n_q
	Number of noise floor bands.

unsigned	n_lim
	Number of limiter bands.

uint16_t	f_master [49]
	The master QMF frequency grouping.

uint16_t	f_tablelow [25]
	Frequency borders for low resolution SBR.

uint16_t	f_tablehigh [49]
	Frequency borders for high resolution SBR.

uint16_t	f_tablenoise [6]
	Frequency borders for noise floors.

uint16_t	f_tablelim [30]
	Frequency borders for the limiter.

unsigned	num_patches

uint8_t	patch_num_subbands [6]

uint8_t	patch_start_subband [6]

float	X_low [32][40][2]
	QMF low frequency input to the HF generator.

float	X_high [64][40][2]
	QMF output of the HF generator.

float	X [2][2][38][64]
	QMF values of the reconstructed signal.

float	alpha0 [64][2]
	Zeroth coefficient used to filter the subband signals.

float	alpha1 [64][2]
	First coefficient used to filter the subband signals.

float	e_origmapped [7][48]
	Dequantized envelope scalefactors, remapped.

float	q_mapped [7][48]
	Dequantized noise scalefactors, remapped.

uint8_t	s_mapped [7][48]
	Sinusoidal presence, remapped.

float	e_curr [7][48]
	Estimated envelope.

float	q_m [7][48]
	Amplitude adjusted noise scalefactors.

float	s_m [7][48]
	Sinusoidal levels.

float	gain [7][48]

float	qmf_filter_scratch [5][64]

FFTContext	mdct_ana

FFTContext	mdct

SBRDSPContext	dsp

AACSBRContext	c

Variables associated with bs_header_extra_2
unsigned	bs_limiter_bands

unsigned	bs_limiter_gains

unsigned	bs_interpol_freq

unsigned	bs_smoothing_mode

Detailed Description

Spectral Band Replication.

Definition at line 137 of file sbr.h.

Field Documentation

int SpectralBandReplication::sample_rate

Definition at line 138 of file sbr.h.

Referenced by ff_decode_sbr_extension(), ff_sbr_apply(), sbr_hf_calc_npatches(), and sbr_make_f_master().

int SpectralBandReplication::start

Definition at line 139 of file sbr.h.

Referenced by ff_decode_sbr_extension(), ff_sbr_apply(), read_sbr_header(), and sbr_turnoff().

int SpectralBandReplication::reset

Definition at line 140 of file sbr.h.

Referenced by ff_decode_sbr_extension(), read_sbr_header(), and sbr_hf_assemble().

SpectrumParameters SpectralBandReplication::spectrum_params

Definition at line 141 of file sbr.h.

Referenced by read_sbr_header(), sbr_make_f_derived(), sbr_make_f_master(), sbr_reset(), and sbr_turnoff().

int SpectralBandReplication::bs_amp_res_header

Definition at line 142 of file sbr.h.

Referenced by read_sbr_grid(), and read_sbr_header().

unsigned SpectralBandReplication::bs_limiter_bands

Definition at line 147 of file sbr.h.

Referenced by read_sbr_header(), and sbr_make_f_tablelim().

unsigned SpectralBandReplication::bs_limiter_gains

Definition at line 148 of file sbr.h.

Referenced by read_sbr_header(), and sbr_gain_calc().

unsigned SpectralBandReplication::bs_interpol_freq

Definition at line 149 of file sbr.h.

Referenced by read_sbr_header(), and sbr_env_estimate().

unsigned SpectralBandReplication::bs_smoothing_mode

Definition at line 150 of file sbr.h.

Referenced by read_sbr_header(), and sbr_hf_assemble().

unsigned SpectralBandReplication::bs_coupling

Definition at line 152 of file sbr.h.

Referenced by read_sbr_channel_pair_element(), read_sbr_envelope(), read_sbr_noise(), and sbr_dequant().

unsigned SpectralBandReplication::k[5]

k0, k1, k2

Definition at line 153 of file sbr.h.

Referenced by ff_sbr_apply(), sbr_hf_calc_npatches(), sbr_make_f_derived(), and sbr_make_f_master().

unsigned SpectralBandReplication::kx[2]

kx', and kx respectively, kx is the first QMF subband where SBR is used.

kx' is its value from the previous frame

Definition at line 156 of file sbr.h.

Referenced by ff_aac_sbr_ctx_init(), ff_decode_sbr_extension(), ff_sbr_apply(), sbr_env_estimate(), sbr_gain_calc(), sbr_hf_assemble(), sbr_hf_calc_npatches(), sbr_hf_gen(), sbr_lf_gen(), sbr_make_f_derived(), sbr_make_f_tablelim(), sbr_mapping(), sbr_turnoff(), and sbr_x_gen().

unsigned SpectralBandReplication::m[2]

M' and M respectively, M is the number of QMF subbands that use SBR.

Definition at line 158 of file sbr.h.

Referenced by ff_decode_sbr_extension(), ff_sbr_apply(), sbr_env_estimate(), sbr_hf_assemble(), sbr_hf_calc_npatches(), sbr_hf_gen(), sbr_make_f_derived(), sbr_turnoff(), and sbr_x_gen().

unsigned SpectralBandReplication::kx_and_m_pushed

Definition at line 159 of file sbr.h.

Referenced by ff_decode_sbr_extension(), and ff_sbr_apply().

unsigned SpectralBandReplication::n_master

The number of frequency bands in f_master.

Definition at line 161 of file sbr.h.

Referenced by sbr_hf_calc_npatches(), sbr_make_f_derived(), and sbr_make_f_master().

SBRData SpectralBandReplication::data[2]

Definition at line 162 of file sbr.h.

Referenced by ff_aac_sbr_ctx_init(), ff_sbr_apply(), read_sbr_channel_pair_element(), read_sbr_single_channel_element(), sbr_dequant(), sbr_make_f_derived(), sbr_turnoff(), and sbr_x_gen().

PSContext SpectralBandReplication::ps

Definition at line 163 of file sbr.h.

Referenced by ff_aac_sbr_ctx_init(), ff_sbr_apply(), and read_sbr_extension().

unsigned SpectralBandReplication::n[2]

N_Low and N_High respectively, the number of frequency bands for low and high resolution.

Definition at line 165 of file sbr.h.

Referenced by read_sbr_channel_pair_element(), read_sbr_envelope(), read_sbr_single_channel_element(), sbr_dequant(), sbr_env_estimate(), sbr_make_f_derived(), sbr_make_f_tablelim(), and sbr_mapping().

unsigned SpectralBandReplication::n_q

Number of noise floor bands.

Definition at line 167 of file sbr.h.

Referenced by read_sbr_invf(), read_sbr_noise(), sbr_chirp(), sbr_dequant(), sbr_make_f_derived(), and sbr_mapping().

unsigned SpectralBandReplication::n_lim

Number of limiter bands.

Definition at line 169 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_make_f_tablelim().

uint16_t SpectralBandReplication::f_master[49]

The master QMF frequency grouping.

Definition at line 171 of file sbr.h.

Referenced by sbr_hf_calc_npatches(), sbr_make_f_derived(), and sbr_make_f_master().

uint16_t SpectralBandReplication::f_tablelow[25]

Frequency borders for low resolution SBR.

Definition at line 173 of file sbr.h.

Referenced by sbr_env_estimate(), sbr_make_f_derived(), sbr_make_f_tablelim(), and sbr_mapping().

uint16_t SpectralBandReplication::f_tablehigh[49]

Frequency borders for high resolution SBR.

Definition at line 175 of file sbr.h.

Referenced by sbr_env_estimate(), sbr_make_f_derived(), and sbr_mapping().

uint16_t SpectralBandReplication::f_tablenoise[6]

Frequency borders for noise floors.

Definition at line 177 of file sbr.h.

Referenced by sbr_hf_gen(), sbr_make_f_derived(), and sbr_mapping().

uint16_t SpectralBandReplication::f_tablelim[30]

Frequency borders for the limiter.

Definition at line 179 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_make_f_tablelim().

unsigned SpectralBandReplication::num_patches

Definition at line 180 of file sbr.h.

Referenced by sbr_hf_calc_npatches(), sbr_hf_gen(), and sbr_make_f_tablelim().

uint8_t SpectralBandReplication::patch_num_subbands[6]

Definition at line 181 of file sbr.h.

Referenced by sbr_hf_calc_npatches(), sbr_hf_gen(), and sbr_make_f_tablelim().

uint8_t SpectralBandReplication::patch_start_subband[6]

Definition at line 182 of file sbr.h.

Referenced by sbr_hf_calc_npatches(), and sbr_hf_gen().

float SpectralBandReplication::X_low[32][40][2]

QMF low frequency input to the HF generator.

Definition at line 184 of file sbr.h.

Referenced by ff_sbr_apply().

float SpectralBandReplication::X_high[64][40][2]

QMF output of the HF generator.

Definition at line 186 of file sbr.h.

Referenced by ff_sbr_apply().

float SpectralBandReplication::X[2][2][38][64]

QMF values of the reconstructed signal.

Definition at line 188 of file sbr.h.

Referenced by ff_sbr_apply().

float SpectralBandReplication::alpha0[64][2]

Zeroth coefficient used to filter the subband signals.

Definition at line 190 of file sbr.h.

Referenced by ff_sbr_apply().

float SpectralBandReplication::alpha1[64][2]

First coefficient used to filter the subband signals.

Definition at line 192 of file sbr.h.

Referenced by ff_sbr_apply().

float SpectralBandReplication::e_origmapped[7][48]

Dequantized envelope scalefactors, remapped.

Definition at line 194 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_mapping().

float SpectralBandReplication::q_mapped[7][48]

Dequantized noise scalefactors, remapped.

Definition at line 196 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_mapping().

uint8_t SpectralBandReplication::s_mapped[7][48]

Sinusoidal presence, remapped.

Definition at line 198 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_mapping().

float SpectralBandReplication::e_curr[7][48]

Estimated envelope.

Definition at line 200 of file sbr.h.

Referenced by ff_sbr_apply(), and sbr_gain_calc().

float SpectralBandReplication::q_m[7][48]

Amplitude adjusted noise scalefactors.

Definition at line 202 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_hf_assemble().

float SpectralBandReplication::s_m[7][48]

Sinusoidal levels.

Definition at line 204 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_hf_assemble().

float SpectralBandReplication::gain[7][48]

Definition at line 205 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_hf_assemble().

float SpectralBandReplication::qmf_filter_scratch[5][64]

Definition at line 206 of file sbr.h.

Referenced by ff_sbr_apply().

FFTContext SpectralBandReplication::mdct_ana

Definition at line 207 of file sbr.h.

Referenced by ff_aac_sbr_ctx_close(), ff_aac_sbr_ctx_init(), and ff_sbr_apply().

FFTContext SpectralBandReplication::mdct

Definition at line 208 of file sbr.h.

Referenced by ff_aac_sbr_ctx_close(), ff_aac_sbr_ctx_init(), and ff_sbr_apply().

SBRDSPContext SpectralBandReplication::dsp

Definition at line 209 of file sbr.h.

Referenced by ff_aac_sbr_ctx_init(), ff_sbr_apply(), sbr_env_estimate(), sbr_hf_assemble(), and sbr_hf_gen().

AACSBRContext SpectralBandReplication::c

Definition at line 210 of file sbr.h.

Referenced by ff_aac_sbr_ctx_init(), and ff_sbr_apply().

The documentation for this struct was generated from the following file:

libavcodec/sbr.h

Data Fields

Detailed Description

Field Documentation