FFmpeg: IndividualChannelStream Struct Reference

FFmpeg

Individual Channel Stream. More...

#include <aac.h>

Data Fields
uint8_t	max_sfb
	number of scalefactor bands per group More...

enum WindowSequence	window_sequence [2]

uint8_t	use_kb_window [2]
	If set, use Kaiser-Bessel window, otherwise use a sine window. More...

int	num_window_groups

uint8_t	group_len [8]

LongTermPrediction	ltp

const uint16_t *	swb_offset
	table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window More...

const uint8_t *	swb_sizes
	table of scalefactor band sizes for a particular window More...

int	num_swb
	number of scalefactor window bands More...

int	num_windows

int	tns_max_bands

int	predictor_present

int	predictor_initialized

int	predictor_reset_group

int	predictor_reset_count [31]
	used by encoder to count prediction resets More...

uint8_t	prediction_used [41]

uint8_t	window_clipping [8]
	set if a certain window is near clipping More...

float	clip_avoidance_factor
	set if any window is near clipping to the necessary atennuation factor to avoid it More...

Detailed Description

Individual Channel Stream.

Definition at line 174 of file aac.h.

Field Documentation

◆ max_sfb

uint8_t IndividualChannelStream::max_sfb

◆ window_sequence

enum WindowSequence IndividualChannelStream::window_sequence[2]

◆ use_kb_window

uint8_t IndividualChannelStream::use_kb_window[2]

If set, use Kaiser-Bessel window, otherwise use a sine window.

Definition at line 177 of file aac.h.

Referenced by aac_encode_frame(), decode_cpe(), decode_ics_info(), imdct_and_windowing(), imdct_and_windowing_960(), imdct_and_windowing_ld(), update_ltp(), and windowing_and_mdct_ltp().

◆ num_window_groups

int IndividualChannelStream::num_window_groups

Definition at line 178 of file aac.h.

Referenced by apply_dependent_coupling(), apply_dependent_coupling_fixed(), apply_intensity_stereo(), apply_mid_side_stereo(), decode_band_types(), decode_cce(), decode_ics_info(), decode_mid_side_stereo(), decode_scalefactors(), and decode_spectrum_and_dequant().

◆ group_len

◆ ltp

LongTermPrediction IndividualChannelStream::ltp

Definition at line 180 of file aac.h.

Referenced by aac_encode_frame(), apply_ltp(), decode_cpe(), decode_ics_info(), ff_aac_adjust_common_ltp(), ff_aac_encode_ltp_info(), ff_aac_ltp_insert_new_frame(), ff_aac_search_for_ltp(), ff_aac_update_ltp(), and spectral_to_sample().

◆ swb_offset

const uint16_t* IndividualChannelStream::swb_offset

table of offsets to the lowest spectral coefficient of a scalefactor band, sfb, for a particular window

Definition at line 181 of file aac.h.

Referenced by aac_encode_frame(), apply_dependent_coupling(), apply_dependent_coupling_fixed(), apply_intensity_stereo(), apply_ltp(), apply_mid_side_stereo(), apply_prediction(), apply_tns(), decode_ics(), decode_ics_info(), decode_spectrum_and_dequant(), ff_aac_apply_main_pred(), ff_aac_apply_tns(), ff_aac_search_for_pred(), ff_aac_search_for_tns(), mark_pns(), search_for_pns(), and search_for_quantizers_twoloop().

◆ swb_sizes

const uint8_t* IndividualChannelStream::swb_sizes

table of scalefactor band sizes for a particular window

Definition at line 182 of file aac.h.

Referenced by aac_encode_frame(), apply_intensity_stereo(), apply_mid_side_stereo(), avoid_clipping(), codebook_trellis_rate(), encode_spectral_coeffs(), encode_window_bands_info(), ff_aac_adjust_common_pred(), ff_aac_is_encoding_err(), ff_aac_search_for_is(), ff_aac_search_for_ltp(), search_for_ms(), search_for_pns(), search_for_quantizers_anmr(), search_for_quantizers_fast(), and search_for_quantizers_twoloop().

◆ num_swb

int IndividualChannelStream::num_swb

number of scalefactor window bands

Definition at line 183 of file aac.h.

Referenced by aac_encode_frame(), adjust_frame_information(), apply_intensity_stereo(), apply_mid_side_stereo(), apply_tns(), decode_ics(), decode_ics_info(), ff_aac_adjust_common_pred(), ff_aac_apply_tns(), ff_aac_search_for_is(), ff_aac_search_for_ltp(), ff_aac_search_for_tns(), ff_init_nextband_map(), mark_pns(), search_for_ms(), search_for_pns(), search_for_quantizers_anmr(), search_for_quantizers_fast(), search_for_quantizers_twoloop(), and set_special_band_scalefactors().

◆ num_windows

◆ tns_max_bands

int IndividualChannelStream::tns_max_bands

Definition at line 185 of file aac.h.

Referenced by aac_encode_frame(), apply_tns(), decode_ics_info(), ff_aac_apply_tns(), and ff_aac_search_for_tns().

◆ predictor_present

int IndividualChannelStream::predictor_present

Definition at line 186 of file aac.h.

Referenced by aac_encode_frame(), apply_prediction(), decode_cpe(), decode_ics_info(), ff_aac_adjust_common_ltp(), ff_aac_adjust_common_pred(), ff_aac_apply_main_pred(), ff_aac_encode_ltp_info(), ff_aac_encode_main_pred(), ff_aac_search_for_ltp(), ff_aac_search_for_pred(), and spectral_to_sample().

◆ predictor_initialized

int IndividualChannelStream::predictor_initialized

Definition at line 187 of file aac.h.

Referenced by apply_prediction(), and ff_aac_search_for_pred().

◆ predictor_reset_group

int IndividualChannelStream::predictor_reset_group

Definition at line 188 of file aac.h.

Referenced by apply_prediction(), decode_ics_info(), decode_prediction(), ff_aac_apply_main_pred(), ff_aac_encode_main_pred(), and update_pred_resets().

◆ predictor_reset_count

int IndividualChannelStream::predictor_reset_count[31]

used by encoder to count prediction resets

Definition at line 189 of file aac.h.

Referenced by ff_aac_search_for_pred(), update_counters(), and update_pred_resets().

◆ prediction_used

uint8_t IndividualChannelStream::prediction_used[41]

Definition at line 190 of file aac.h.

Referenced by aac_encode_frame(), apply_prediction(), decode_prediction(), ff_aac_adjust_common_pred(), ff_aac_apply_main_pred(), ff_aac_encode_main_pred(), and ff_aac_search_for_pred().

◆ window_clipping

uint8_t IndividualChannelStream::window_clipping[8]

set if a certain window is near clipping

Definition at line 191 of file aac.h.

Referenced by aac_encode_frame(), and encode_spectral_coeffs().

◆ clip_avoidance_factor

float IndividualChannelStream::clip_avoidance_factor

set if any window is near clipping to the necessary atennuation factor to avoid it

Definition at line 192 of file aac.h.

Referenced by aac_encode_frame(), and avoid_clipping().

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

libavcodec/aac.h