FFmpeg: SpectralBandReplication Struct Reference

FFmpeg 4.0

Spectral Band Replication. More...

#include <libavcodec/sbr.h>

Data Fields
int	sample_rate

int	start

int	ready_for_dequant

int	id_aac

int	reset

SpectrumParameters	spectrum_params

int	bs_amp_res_header

unsigned	bs_coupling

AAC_SIGNE	k [5]
	k0, k1, k2 More...

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

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

unsigned	kx_and_m_pushed

AAC_SIGNE	n_master
	The number of frequency bands in f_master. More...

SBRData	data [2]

PSContext	ps

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

AAC_SIGNE	n_q
	Number of noise floor bands. More...

AAC_SIGNE	n_lim
	Number of limiter bands. More...

uint16_t	f_master [49]
	The master QMF frequency grouping. More...

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

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

uint16_t	f_tablenoise [6]
	Frequency borders for noise floors. More...

uint16_t	f_tablelim [30]
	Frequency borders for the limiter. More...

AAC_SIGNE	num_patches

uint8_t	patch_num_subbands [6]

uint8_t	patch_start_subband [6]

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

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

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

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

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

AAC_FLOAT	e_origmapped [7][48]
	Dequantized envelope scalefactors, remapped. More...

AAC_FLOAT	q_mapped [7][48]
	Dequantized noise scalefactors, remapped. More...

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

AAC_FLOAT	e_curr [7][48]
	Estimated envelope. More...

AAC_FLOAT	q_m [7][48]
	Amplitude adjusted noise scalefactors. More...

AAC_FLOAT	s_m [7][48]
	Sinusoidal levels. More...

AAC_FLOAT	gain [7][48]

INTFLOAT	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 139 of file sbr.h.

Field Documentation

◆ sample_rate

int SpectralBandReplication::sample_rate

Definition at line 140 of file sbr.h.

Referenced by sbr_hf_calc_npatches(), and sbr_make_f_master().

◆ start

int SpectralBandReplication::start

Definition at line 141 of file sbr.h.

Referenced by read_sbr_header(), and sbr_turnoff().

◆ ready_for_dequant

int SpectralBandReplication::ready_for_dequant

Definition at line 142 of file sbr.h.

Referenced by read_sbr_data(), read_sbr_header(), and sbr_turnoff().

◆ id_aac

int SpectralBandReplication::id_aac

Definition at line 143 of file sbr.h.

Referenced by read_sbr_data().

◆ reset

int SpectralBandReplication::reset

Definition at line 144 of file sbr.h.

Referenced by read_sbr_header(), and sbr_hf_assemble().

◆ spectrum_params

SpectrumParameters SpectralBandReplication::spectrum_params

Definition at line 145 of file sbr.h.

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

◆ bs_amp_res_header

int SpectralBandReplication::bs_amp_res_header

Definition at line 146 of file sbr.h.

Referenced by read_sbr_grid(), and read_sbr_header().

◆ bs_limiter_bands

unsigned SpectralBandReplication::bs_limiter_bands

Definition at line 151 of file sbr.h.

Referenced by read_sbr_header(), and sbr_make_f_tablelim().

◆ bs_limiter_gains

unsigned SpectralBandReplication::bs_limiter_gains

Definition at line 152 of file sbr.h.

Referenced by read_sbr_header(), and sbr_gain_calc().

◆ bs_interpol_freq

unsigned SpectralBandReplication::bs_interpol_freq

Definition at line 153 of file sbr.h.

Referenced by read_sbr_header(), and sbr_env_estimate().

◆ bs_smoothing_mode

unsigned SpectralBandReplication::bs_smoothing_mode

Definition at line 154 of file sbr.h.

Referenced by read_sbr_header(), and sbr_hf_assemble().

◆ bs_coupling

unsigned SpectralBandReplication::bs_coupling

Definition at line 156 of file sbr.h.

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

◆ k

AAC_SIGNE SpectralBandReplication::k[5]

k0, k1, k2

Definition at line 157 of file sbr.h.

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

◆ kx

AAC_SIGNE 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 160 of file sbr.h.

Referenced by 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().

◆ m

AAC_SIGNE SpectralBandReplication::m[2]

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

Definition at line 162 of file sbr.h.

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

◆ kx_and_m_pushed

unsigned SpectralBandReplication::kx_and_m_pushed

Definition at line 163 of file sbr.h.

◆ n_master

AAC_SIGNE SpectralBandReplication::n_master

The number of frequency bands in f_master.

Definition at line 165 of file sbr.h.

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

◆ data

SBRData SpectralBandReplication::data[2]

Definition at line 166 of file sbr.h.

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

◆ ps

PSContext SpectralBandReplication::ps

Definition at line 167 of file sbr.h.

Referenced by read_sbr_extension().

◆ n

AAC_SIGNE SpectralBandReplication::n[2]

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

Definition at line 169 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().

◆ n_q

AAC_SIGNE SpectralBandReplication::n_q

Number of noise floor bands.

Definition at line 171 of file sbr.h.

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

◆ n_lim

AAC_SIGNE SpectralBandReplication::n_lim

Number of limiter bands.

Definition at line 173 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_make_f_tablelim().

◆ f_master

uint16_t SpectralBandReplication::f_master[49]

The master QMF frequency grouping.

Definition at line 175 of file sbr.h.

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

◆ f_tablelow

uint16_t SpectralBandReplication::f_tablelow[25]

Frequency borders for low resolution SBR.

Definition at line 177 of file sbr.h.

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

◆ f_tablehigh

uint16_t SpectralBandReplication::f_tablehigh[49]

Frequency borders for high resolution SBR.

Definition at line 179 of file sbr.h.

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

◆ f_tablenoise

uint16_t SpectralBandReplication::f_tablenoise[6]

Frequency borders for noise floors.

Definition at line 181 of file sbr.h.

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

◆ f_tablelim

uint16_t SpectralBandReplication::f_tablelim[30]

Frequency borders for the limiter.

Definition at line 183 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_make_f_tablelim().

◆ num_patches

AAC_SIGNE SpectralBandReplication::num_patches

Definition at line 184 of file sbr.h.

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

◆ patch_num_subbands

uint8_t SpectralBandReplication::patch_num_subbands[6]

Definition at line 185 of file sbr.h.

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

◆ patch_start_subband

uint8_t SpectralBandReplication::patch_start_subband[6]

Definition at line 186 of file sbr.h.

Referenced by sbr_hf_calc_npatches(), and sbr_hf_gen().

◆ X_low

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

QMF low frequency input to the HF generator.

Definition at line 188 of file sbr.h.

◆ X_high

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

QMF output of the HF generator.

Definition at line 190 of file sbr.h.

◆ X

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

QMF values of the reconstructed signal.

Definition at line 192 of file sbr.h.

◆ alpha0

INTFLOAT SpectralBandReplication::alpha0[64][2]

Zeroth coefficient used to filter the subband signals.

Definition at line 194 of file sbr.h.

◆ alpha1

INTFLOAT SpectralBandReplication::alpha1[64][2]

First coefficient used to filter the subband signals.

Definition at line 196 of file sbr.h.

◆ e_origmapped

AAC_FLOAT SpectralBandReplication::e_origmapped[7][48]

Dequantized envelope scalefactors, remapped.

Definition at line 198 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_mapping().

◆ q_mapped

AAC_FLOAT SpectralBandReplication::q_mapped[7][48]

Dequantized noise scalefactors, remapped.

Definition at line 200 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_mapping().

◆ s_mapped

uint8_t SpectralBandReplication::s_mapped[7][48]

Sinusoidal presence, remapped.

Definition at line 202 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_mapping().

◆ e_curr

AAC_FLOAT SpectralBandReplication::e_curr[7][48]

Estimated envelope.

Definition at line 204 of file sbr.h.

Referenced by sbr_gain_calc().

◆ q_m

AAC_FLOAT SpectralBandReplication::q_m[7][48]

Amplitude adjusted noise scalefactors.

Definition at line 206 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_hf_assemble().

◆ s_m

AAC_FLOAT SpectralBandReplication::s_m[7][48]

Sinusoidal levels.

Definition at line 208 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_hf_assemble().

◆ gain

AAC_FLOAT SpectralBandReplication::gain[7][48]

Definition at line 209 of file sbr.h.

Referenced by sbr_gain_calc(), and sbr_hf_assemble().

◆ qmf_filter_scratch

INTFLOAT SpectralBandReplication::qmf_filter_scratch[5][64]

Definition at line 210 of file sbr.h.

◆ mdct_ana

FFTContext SpectralBandReplication::mdct_ana

Definition at line 211 of file sbr.h.

◆ mdct

FFTContext SpectralBandReplication::mdct

Definition at line 212 of file sbr.h.

◆ dsp

SBRDSPContext SpectralBandReplication::dsp

Definition at line 213 of file sbr.h.

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

◆ c

AACSBRContext SpectralBandReplication::c

Definition at line 214 of file sbr.h.

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

libavcodec/sbr.h