AacPsyChannel Struct Reference

single/pair channel context for psychoacoustic model More...

Data Fields
AacPsyBand	band [128]
	bands information
AacPsyBand	prev_band [128]
	bands information from the previous frame
float	win_energy
	sliding average of channel energy
float	iir_state [2]
	hi-pass IIR filter state
uint8_t	next_grouping
	stored grouping scheme for the next frame (in case of 8 short window sequence)
enum WindowSequence	next_window_seq
	window sequence to be used in the next frame
float	attack_threshold
	attack threshold for this channel
float	prev_energy_subshort [AAC_NUM_BLOCKS_SHORT *PSY_LAME_NUM_SUBBLOCKS]
float	next_win_level [AAC_NUM_BLOCKS_SHORT]
	lookahead short-window peak levels (grouping homogeneity)
float	dif_env_hist [PSY_LAME_HIST]
	rolling first-difference sub-block peak envelope (HF novelty)
float	hp_env_hist [PSY_LAME_HIST]
	rolling HP sub-block peak envelope
float	raw_env_hist [PSY_LAME_HIST]
	rolling broadband sub-block peak envelope
float	gap_wall
	decaying broadband peak-hold (gap-onset reference)
float	gap_wall_hp
	decaying HP peak-hold (gap-onset reference)
int	prev_attack
	attack value for the last short block in the previous sequence
int	next_attack0_zero
	whether attack[0] of the next frame is zero
int	frames_since_short
	consecutive long frames (pre-echo-aware isolated-onset gate)
float	prev_frame_energy
	previous frame's full-band lookahead energy (attack veto)
int64_t	win_count
	window() calls so far (frame counter for pair sync)
int64_t	last_att
	win_count value of this channel's last own attack
int64_t	rc_frame_num
	frame this channel last saved rewind state for
AacPsyBand	rc_prev_band [128]
	prev_band as it was entering the frame

Detailed Description

single/pair channel context for psychoacoustic model

Definition at line 179 of file aacpsy.c.

Field Documentation

band

AacPsyBand AacPsyChannel::band[128]

bands information

Definition at line 180 of file aacpsy.c.

Referenced by calc_thr_3gpp(), and psy_3gpp_analyze_channel().

prev_band

AacPsyBand AacPsyChannel::prev_band[128]

bands information from the previous frame

Definition at line 181 of file aacpsy.c.

Referenced by psy_3gpp_analyze(), and psy_3gpp_analyze_channel().

win_energy

float AacPsyChannel::win_energy

sliding average of channel energy

Definition at line 183 of file aacpsy.c.

Referenced by psy_3gpp_window().

iir_state

float AacPsyChannel::iir_state[2]

hi-pass IIR filter state

Definition at line 184 of file aacpsy.c.

Referenced by psy_3gpp_window().

next_grouping

uint8_t AacPsyChannel::next_grouping

stored grouping scheme for the next frame (in case of 8 short window sequence)

Definition at line 185 of file aacpsy.c.

Referenced by psy_3gpp_window(), and psy_lame_apply().

next_window_seq

enum WindowSequence AacPsyChannel::next_window_seq

window sequence to be used in the next frame

Definition at line 186 of file aacpsy.c.

Referenced by psy_3gpp_window().

attack_threshold

float AacPsyChannel::attack_threshold

attack threshold for this channel

Definition at line 188 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

prev_energy_subshort

float AacPsyChannel::prev_energy_subshort[AAC_NUM_BLOCKS_SHORT *PSY_LAME_NUM_SUBBLOCKS]

Definition at line 189 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

next_win_level

float AacPsyChannel::next_win_level[AAC_NUM_BLOCKS_SHORT]

lookahead short-window peak levels (grouping homogeneity)

Definition at line 190 of file aacpsy.c.

Referenced by psy_lame_apply(), psy_lame_detect(), and psy_lame_window_pair().

dif_env_hist

float AacPsyChannel::dif_env_hist[PSY_LAME_HIST]

rolling first-difference sub-block peak envelope (HF novelty)

Definition at line 191 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

hp_env_hist

float AacPsyChannel::hp_env_hist[PSY_LAME_HIST]

rolling HP sub-block peak envelope

Definition at line 192 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

raw_env_hist

float AacPsyChannel::raw_env_hist[PSY_LAME_HIST]

rolling broadband sub-block peak envelope

Definition at line 193 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

gap_wall

float AacPsyChannel::gap_wall

decaying broadband peak-hold (gap-onset reference)

Definition at line 194 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

gap_wall_hp

float AacPsyChannel::gap_wall_hp

decaying HP peak-hold (gap-onset reference)

Definition at line 195 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

prev_attack

int AacPsyChannel::prev_attack

attack value for the last short block in the previous sequence

Definition at line 196 of file aacpsy.c.

Referenced by psy_lame_apply(), and psy_lame_detect().

next_attack0_zero

int AacPsyChannel::next_attack0_zero

whether attack[0] of the next frame is zero

Definition at line 197 of file aacpsy.c.

Referenced by psy_lame_detect().

frames_since_short

int AacPsyChannel::frames_since_short

consecutive long frames (pre-echo-aware isolated-onset gate)

Definition at line 198 of file aacpsy.c.

Referenced by psy_lame_apply(), and psy_lame_detect().

prev_frame_energy

float AacPsyChannel::prev_frame_energy

previous frame's full-band lookahead energy (attack veto)

Definition at line 199 of file aacpsy.c.

win_count

int64_t AacPsyChannel::win_count

window() calls so far (frame counter for pair sync)

Definition at line 200 of file aacpsy.c.

last_att

int64_t AacPsyChannel::last_att

win_count value of this channel's last own attack

Definition at line 201 of file aacpsy.c.

rc_frame_num

int64_t AacPsyChannel::rc_frame_num

frame this channel last saved rewind state for

Definition at line 204 of file aacpsy.c.

Referenced by psy_3gpp_analyze(), and psy_3gpp_init().

rc_prev_band

AacPsyBand AacPsyChannel::rc_prev_band[128]

prev_band as it was entering the frame

Definition at line 205 of file aacpsy.c.

Referenced by psy_3gpp_analyze().

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

• libavcodec/aacpsy.c