AAC encoder psychoacoustic model. More...

#include "libavutil/attributes.h"
#include "libavutil/ffmath.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "aac.h"
#include "psymodel.h"

Data Structures
struct	AacPsyBand
	information for single band used by 3GPP TS26.403-inspired psychoacoustic model More...

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

struct	AacPsyCoeffs
	psychoacoustic model frame type-dependent coefficients More...

struct	AacPsyContext
	3GPP TS26.403-inspired psychoacoustic model specific data More...

struct	PsyLamePreset
	LAME psy model preset struct. More...

Macros
#define	ATH_ADD 4

Functions
static float	lame_calc_attack_threshold (int bitrate)
	Calculate the ABR attack threshold from the above LAME psymodel table.

static av_cold void	lame_window_init (FFPsyContext fctx, AacPsyContext ctx, AVCodecContext *avctx)
	LAME psy model specific initialization.

static av_cold float	calc_bark (float f)
	Calculate Bark value for given line.

static av_cold float	ath (float f, float add)
	Calculate ATH value for given frequency.

static av_cold int	psy_3gpp_init (FFPsyContext *ctx)

static float	iir_filter (int in, float state[2])
	IIR filter used in block switching decision.

static av_unused FFPsyWindowInfo	psy_3gpp_window (FFPsyContext ctx, const int16_t audio, const int16_t *la, int channel, int prev_type)
	Tell encoder which window types to use.

static int	calc_bit_demand (AacPsyContext *ctx, float pe, int bits, int size, int short_window)

static float	calc_pe_3gpp (AacPsyBand *band)

static float	calc_reduction_3gpp (float a, float desired_pe, float pe, float active_lines)

static float	calc_reduced_thr_3gpp (AacPsyBand *band, float min_snr, float reduction)

static void	calc_thr_3gpp (const FFPsyWindowInfo wi, const int num_bands, AacPsyChannel pch, const uint8_t band_sizes, const float coefs, const int cutoff)

static void	psy_hp_filter (const float firbuf, float hpfsmpl, const float *psy_fir_coeffs)

static void	psy_3gpp_analyze_channel (FFPsyContext ctx, int channel, const float coefs, const FFPsyWindowInfo *wi)
	Calculate band thresholds as suggested in 3GPP TS26.403.

static void	psy_3gpp_analyze (FFPsyContext ctx, int channel, const float coeffs, const FFPsyWindowInfo wi)

static av_cold void	psy_3gpp_end (FFPsyContext *apc)

static void	lame_apply_block_type (AacPsyChannel ctx, FFPsyWindowInfo wi, int uselongblock)

static int	psy_lame_detect (AacPsyContext pctx, AacPsyChannel pch, const float *la, int channel, int prev_type, int attacks[AAC_NUM_BLOCKS_SHORT+1])

static FFPsyWindowInfo	psy_lame_apply (AacPsyContext pctx, AacPsyChannel pch, int uselongblock, const int attacks[AAC_NUM_BLOCKS_SHORT+1], int prev_type, int have_la)

static FFPsyWindowInfo	psy_lame_window (FFPsyContext ctx, const float audio, const float *la, int channel, int prev_type)

static void	psy_lame_window_pair (FFPsyContext ctx, const float audio0, const float la0, const float audio1, const float *la1, int channel0, int channel1, int prev_type0, int prev_type1, FFPsyWindowInfo wi[2])

Variables
static const PsyLamePreset	psy_abr_map []
	LAME psy model preset table for ABR.

static const PsyLamePreset	psy_vbr_map []
	LAME psy model preset table for constant quality.

static const float	psy_fir_coeffs []
	LAME psy model FIR coefficient table.

static const uint8_t	window_grouping [9]
	window grouping information stored as bits (0 - new group, 1 - group continues)

const FFPsyModel	ff_aac_psy_model

#define	PSY_3GPP_THR_SPREAD_HI 1.5f
	constants for 3GPP AAC psychoacoustic model

#define	PSY_3GPP_THR_SPREAD_LOW 3.0f

#define	PSY_3GPP_EN_SPREAD_HI_L1 2.0f

#define	PSY_3GPP_EN_SPREAD_HI_L2 1.5f

#define	PSY_3GPP_EN_SPREAD_HI_S 1.5f

#define	PSY_3GPP_EN_SPREAD_LOW_L 3.0f

#define	PSY_3GPP_EN_SPREAD_LOW_S 2.0f

#define	PSY_3GPP_RPEMIN 0.01f

#define	PSY_3GPP_RPELEV 2.0f

#define	PSY_3GPP_C1 3.0f /* log2(8) */

#define	PSY_3GPP_C2 1.3219281f /* log2(2.5) */

#define	PSY_3GPP_C3 0.55935729f /* 1 - C2 / C1 */

#define	PSY_SNR_1DB 7.9432821e-1f /* -1dB */

#define	PSY_SNR_25DB 3.1622776e-3f /* -25dB */

#define	PSY_3GPP_SAVE_SLOPE_L -0.46666667f

#define	PSY_3GPP_SAVE_SLOPE_S -0.36363637f

#define	PSY_3GPP_SAVE_ADD_L -0.84285712f

#define	PSY_3GPP_SAVE_ADD_S -0.75f

#define	PSY_3GPP_SPEND_SLOPE_L 0.66666669f

#define	PSY_3GPP_SPEND_SLOPE_S 0.81818181f

#define	PSY_3GPP_SPEND_ADD_L -0.35f

#define	PSY_3GPP_SPEND_ADD_S -0.26111111f

#define	PSY_3GPP_CLIP_LO_L 0.2f

#define	PSY_3GPP_CLIP_LO_S 0.2f

#define	PSY_3GPP_CLIP_HI_L 0.95f

#define	PSY_3GPP_CLIP_HI_S 0.75f

#define	PSY_THRFL_QUALITY 10.0f /* VBR/ABR depth, dB, all bands */

#define	PSY_THRFL_CBR 6.0f /* CBR depth, dB */

#define	PSY_THRFL_CBR_KNEE 8000.0f /* CBR: only above this frequency */

#define	PSY_3GPP_DEMAND_SCALE 2.5f

#define	PSY_3GPP_AH_THR_LONG 0.5f

#define	PSY_3GPP_AH_THR_SHORT 0.63f

#define	PSY_PE_FORGET_SLOPE 511

#define	PSY_3GPP_BITS_TO_PE(bits)

#define	PSY_3GPP_PE_TO_BITS(bits)

#define	PSY_LAME_FIR_LEN 21
	LAME psy model FIR order.

#define	AAC_BLOCK_SIZE_LONG 1024
	long block size

#define	AAC_BLOCK_SIZE_SHORT 128
	short block size

#define	AAC_NUM_BLOCKS_SHORT 8
	number of blocks in a short sequence

#define	PSY_LAME_NUM_SUBBLOCKS 2
	Number of sub-blocks in each short block.

#define	PSY_LAME_PE_GAP 12
	min consecutive long frames before the relaxation applies

#define	PSY_LAME_PE_QUIET 0.4f
	pre-onset must be below this fraction of the frame peak

#define	PSY_LAME_PE_RED 0.45f
	attack-threshold multiplier for a qualifying isolated onset

#define	PSY_LAME_HIST 32
	HP sub-block peak history depth.

#define	PSY_LAME_NOV_BACK 30
	novelty look-back in sub-blocks

#define	PSY_LAME_HFN_REL 4.0f
	max derivative rise over the recent envelope

#define	PSY_LAME_HFN_ABS 2000.0f
	max absolute derivative peak

#define	PSY_LAME_HFN_PRE 8.0f
	max candidate rise over the ~5ms pre-attack minimum

#define	PSY_LAME_GAP_DEPTH 6.0f
	a gap is this far below the peak-hold

#define	PSY_LAME_GAP_BACK 24
	gap look-back in sub-blocks (<= PSY_LAME_HIST)

#define	PSY_LAME_GAP_LEVEL 0.4f
	candidate must reach this fraction of the peak-hold

#define	PSY_LAME_GAP_FLOOR 4000.0f
	and this absolute peak

#define	PSY_LAME_GAP_TOWER 4.0f
	HP tower: rise over the whole look-back.

#define	PSY_LAME_GRP_RATIO 2.5f
	max adjacent-window level ratio inside a group

#define	PSY_LAME_GRP_MAX 4
	max windows per group

enum	{ PSY_3GPP_AH_NONE , PSY_3GPP_AH_INACTIVE , PSY_3GPP_AH_ACTIVE }

Detailed Description

AAC encoder psychoacoustic model.

Definition in file aacpsy.c.

Macro Definition Documentation

◆ PSY_3GPP_THR_SPREAD_HI

#define PSY_3GPP_THR_SPREAD_HI 1.5f

constants for 3GPP AAC psychoacoustic model

Definition at line 45 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ PSY_3GPP_THR_SPREAD_LOW

#define PSY_3GPP_THR_SPREAD_LOW 3.0f

Definition at line 46 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ PSY_3GPP_EN_SPREAD_HI_L1

#define PSY_3GPP_EN_SPREAD_HI_L1 2.0f

Definition at line 48 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ PSY_3GPP_EN_SPREAD_HI_L2

#define PSY_3GPP_EN_SPREAD_HI_L2 1.5f

Definition at line 50 of file aacpsy.c.

◆ PSY_3GPP_EN_SPREAD_HI_S

#define PSY_3GPP_EN_SPREAD_HI_S 1.5f

Definition at line 52 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ PSY_3GPP_EN_SPREAD_LOW_L

#define PSY_3GPP_EN_SPREAD_LOW_L 3.0f

Definition at line 54 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ PSY_3GPP_EN_SPREAD_LOW_S

#define PSY_3GPP_EN_SPREAD_LOW_S 2.0f

Definition at line 56 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ PSY_3GPP_RPEMIN

#define PSY_3GPP_RPEMIN 0.01f

Definition at line 58 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_3GPP_RPELEV

#define PSY_3GPP_RPELEV 2.0f

Definition at line 59 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_3GPP_C1

#define PSY_3GPP_C1 3.0f /* log2(8) */

Definition at line 61 of file aacpsy.c.

Referenced by calc_pe_3gpp().

◆ PSY_3GPP_C2

#define PSY_3GPP_C2 1.3219281f /* log2(2.5) */

Definition at line 62 of file aacpsy.c.

Referenced by calc_pe_3gpp().

◆ PSY_3GPP_C3

#define PSY_3GPP_C3 0.55935729f /* 1 - C2 / C1 */

Definition at line 63 of file aacpsy.c.

Referenced by calc_pe_3gpp().

◆ PSY_SNR_1DB

#define PSY_SNR_1DB 7.9432821e-1f /* -1dB */

Definition at line 65 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel(), and psy_3gpp_init().

◆ PSY_SNR_25DB

#define PSY_SNR_25DB 3.1622776e-3f /* -25dB */

Definition at line 66 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ PSY_3GPP_SAVE_SLOPE_L

#define PSY_3GPP_SAVE_SLOPE_L -0.46666667f

Definition at line 68 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_SAVE_SLOPE_S

#define PSY_3GPP_SAVE_SLOPE_S -0.36363637f

Definition at line 69 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_SAVE_ADD_L

#define PSY_3GPP_SAVE_ADD_L -0.84285712f

Definition at line 70 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_SAVE_ADD_S

#define PSY_3GPP_SAVE_ADD_S -0.75f

Definition at line 71 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_SPEND_SLOPE_L

#define PSY_3GPP_SPEND_SLOPE_L 0.66666669f

Definition at line 72 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_SPEND_SLOPE_S

#define PSY_3GPP_SPEND_SLOPE_S 0.81818181f

Definition at line 73 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_SPEND_ADD_L

#define PSY_3GPP_SPEND_ADD_L -0.35f

Definition at line 74 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_SPEND_ADD_S

#define PSY_3GPP_SPEND_ADD_S -0.26111111f

Definition at line 75 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_CLIP_LO_L

#define PSY_3GPP_CLIP_LO_L 0.2f

Definition at line 76 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_CLIP_LO_S

#define PSY_3GPP_CLIP_LO_S 0.2f

Definition at line 77 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_CLIP_HI_L

#define PSY_3GPP_CLIP_HI_L 0.95f

Definition at line 78 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_CLIP_HI_S

#define PSY_3GPP_CLIP_HI_S 0.75f

Definition at line 79 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_THRFL_QUALITY

#define PSY_THRFL_QUALITY 10.0f /* VBR/ABR depth, dB, all bands */

Definition at line 90 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_THRFL_CBR

#define PSY_THRFL_CBR 6.0f /* CBR depth, dB */

Definition at line 91 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_THRFL_CBR_KNEE

#define PSY_THRFL_CBR_KNEE 8000.0f /* CBR: only above this frequency */

Definition at line 92 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_3GPP_DEMAND_SCALE

#define PSY_3GPP_DEMAND_SCALE 2.5f

Definition at line 103 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_AH_THR_LONG

#define PSY_3GPP_AH_THR_LONG 0.5f

Definition at line 105 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_3GPP_AH_THR_SHORT

#define PSY_3GPP_AH_THR_SHORT 0.63f

Definition at line 106 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_PE_FORGET_SLOPE

#define PSY_PE_FORGET_SLOPE 511

Definition at line 108 of file aacpsy.c.

Referenced by calc_bit_demand().

◆ PSY_3GPP_BITS_TO_PE

#define PSY_3GPP_BITS_TO_PE ( bits )

Value:

((bits) * 1.18f)

bits

static const uint8_t bits[8]

Definition fastaudio.c:100

Definition at line 116 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel(), and psy_3gpp_init().

◆ PSY_3GPP_PE_TO_BITS

#define PSY_3GPP_PE_TO_BITS ( bits )

Value:

((bits) / 1.18f)

Definition at line 117 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ PSY_LAME_FIR_LEN

#define PSY_LAME_FIR_LEN 21

LAME psy model FIR order.

Definition at line 120 of file aacpsy.c.

Referenced by psy_hp_filter(), and psy_lame_detect().

◆ AAC_BLOCK_SIZE_LONG

#define AAC_BLOCK_SIZE_LONG 1024

long block size

Definition at line 121 of file aacpsy.c.

Referenced by psy_3gpp_init(), psy_hp_filter(), and psy_lame_detect().

◆ AAC_BLOCK_SIZE_SHORT

#define AAC_BLOCK_SIZE_SHORT 128

short block size

Definition at line 122 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ AAC_NUM_BLOCKS_SHORT

#define AAC_NUM_BLOCKS_SHORT 8

number of blocks in a short sequence

Definition at line 123 of file aacpsy.c.

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

◆ PSY_LAME_NUM_SUBBLOCKS

#define PSY_LAME_NUM_SUBBLOCKS 2

Number of sub-blocks in each short block.

Definition at line 124 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

◆ PSY_LAME_PE_GAP

#define PSY_LAME_PE_GAP 12

min consecutive long frames before the relaxation applies

Definition at line 130 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_PE_QUIET

#define PSY_LAME_PE_QUIET 0.4f

pre-onset must be below this fraction of the frame peak

Definition at line 131 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_PE_RED

#define PSY_LAME_PE_RED 0.45f

attack-threshold multiplier for a qualifying isolated onset

Definition at line 132 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_HIST

#define PSY_LAME_HIST 32

HP sub-block peak history depth.

Definition at line 136 of file aacpsy.c.

Referenced by lame_window_init(), and psy_lame_detect().

◆ PSY_LAME_NOV_BACK

#define PSY_LAME_NOV_BACK 30

novelty look-back in sub-blocks

Definition at line 137 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_HFN_REL

#define PSY_LAME_HFN_REL 4.0f

max derivative rise over the recent envelope

Definition at line 142 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_HFN_ABS

#define PSY_LAME_HFN_ABS 2000.0f

max absolute derivative peak

Definition at line 143 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_HFN_PRE

#define PSY_LAME_HFN_PRE 8.0f

max candidate rise over the ~5ms pre-attack minimum

Definition at line 144 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_GAP_DEPTH

#define PSY_LAME_GAP_DEPTH 6.0f

a gap is this far below the peak-hold

Definition at line 147 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_GAP_BACK

#define PSY_LAME_GAP_BACK 24

gap look-back in sub-blocks (<= PSY_LAME_HIST)

Definition at line 148 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_GAP_LEVEL

#define PSY_LAME_GAP_LEVEL 0.4f

candidate must reach this fraction of the peak-hold

Definition at line 149 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_GAP_FLOOR

#define PSY_LAME_GAP_FLOOR 4000.0f

and this absolute peak

Definition at line 150 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_GAP_TOWER

#define PSY_LAME_GAP_TOWER 4.0f

HP tower: rise over the whole look-back.

Definition at line 151 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ PSY_LAME_GRP_RATIO

#define PSY_LAME_GRP_RATIO 2.5f

max adjacent-window level ratio inside a group

Definition at line 154 of file aacpsy.c.

Referenced by psy_lame_apply().

◆ PSY_LAME_GRP_MAX

#define PSY_LAME_GRP_MAX 4

max windows per group

Definition at line 155 of file aacpsy.c.

Referenced by psy_lame_apply().

◆ ATH_ADD

#define ATH_ADD 4

Definition at line 365 of file aacpsy.c.

Referenced by psy_3gpp_init().

Enumeration Type Documentation

◆ anonymous enum

anonymous enum

Enumerator
PSY_3GPP_AH_NONE
PSY_3GPP_AH_INACTIVE
PSY_3GPP_AH_ACTIVE

Definition at line 110 of file aacpsy.c.

Function Documentation

◆ lame_calc_attack_threshold()

static float lame_calc_attack_threshold ( int bitrate )

static

Calculate the ABR attack threshold from the above LAME psymodel table.

Definition at line 305 of file aacpsy.c.

Referenced by lame_window_init().

◆ lame_window_init()

static av_cold void lame_window_init	(	FFPsyContext *	fctx,
		AacPsyContext *	ctx,
		AVCodecContext *	avctx )

static

LAME psy model specific initialization.

Definition at line 335 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ calc_bark()

static av_cold float calc_bark ( float f )

static

Calculate Bark value for given line.

Definition at line 360 of file aacpsy.c.

Referenced by psy_3gpp_init().

◆ ath()

static av_cold float ath	(	float	f,
		float	add )

static

Calculate ATH value for given frequency.

Borrowed from Lame.

Definition at line 370 of file aacpsy.c.

Referenced by ath_init(), ath_init1(), psy_3gpp_init(), and unpack().

◆ psy_3gpp_init()

static av_cold int psy_3gpp_init ( FFPsyContext * ctx )

static

Definition at line 379 of file aacpsy.c.

◆ iir_filter()

static float iir_filter	(	int	in,
		float	state[2] )

static

IIR filter used in block switching decision.

Definition at line 469 of file aacpsy.c.

◆ psy_3gpp_window()

static av_unused FFPsyWindowInfo psy_3gpp_window	(	FFPsyContext *	ctx,
		const int16_t *	audio,
		const int16_t *	la,
		int	channel,
		int	prev_type )

static

Tell encoder which window types to use.

See also: 3GPP TS26.403 5.4.1 "Blockswitching"

Definition at line 490 of file aacpsy.c.

◆ calc_bit_demand()

static int calc_bit_demand	(	AacPsyContext *	ctx,
		float	pe,
		int	bits,
		int	size,
		int	short_window )

static

Definition at line 576 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ calc_pe_3gpp()

static float calc_pe_3gpp ( AacPsyBand * band )

static

Definition at line 620 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ calc_reduction_3gpp()

static float calc_reduction_3gpp	(	float	a,
		float	desired_pe,
		float	pe,
		float	active_lines )

static

Definition at line 643 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ calc_reduced_thr_3gpp()

static float calc_reduced_thr_3gpp	(	AacPsyBand *	band,
		float	min_snr,
		float	reduction )

static

Definition at line 657 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ calc_thr_3gpp()

static void calc_thr_3gpp	(	const FFPsyWindowInfo *	wi,
		const int	num_bands,
		AacPsyChannel *	pch,
		const uint8_t *	band_sizes,
		const float *	coefs,
		const int	cutoff )

static

Definition at line 682 of file aacpsy.c.

Referenced by psy_3gpp_analyze_channel().

◆ psy_hp_filter()

static void psy_hp_filter	(	const float *	firbuf,
		float *	hpfsmpl,
		const float *	psy_fir_coeffs )

static

Definition at line 711 of file aacpsy.c.

Referenced by psy_lame_detect().

◆ psy_3gpp_analyze_channel()

static void psy_3gpp_analyze_channel	(	FFPsyContext *	ctx,
		int	channel,
		const float *	coefs,
		const FFPsyWindowInfo *	wi )

static

Calculate band thresholds as suggested in 3GPP TS26.403.

Definition at line 731 of file aacpsy.c.

Referenced by psy_3gpp_analyze().

◆ psy_3gpp_analyze()

static void psy_3gpp_analyze	(	FFPsyContext *	ctx,
		int	channel,
		const float **	coeffs,
		const FFPsyWindowInfo *	wi )

static

Definition at line 990 of file aacpsy.c.

◆ psy_3gpp_end()

static av_cold void psy_3gpp_end ( FFPsyContext * apc )

static

Definition at line 1027 of file aacpsy.c.

◆ lame_apply_block_type()

static void lame_apply_block_type	(	AacPsyChannel *	ctx,
		FFPsyWindowInfo *	wi,
		int	uselongblock )

static

Definition at line 1035 of file aacpsy.c.

Referenced by psy_lame_apply().

◆ psy_lame_detect()

static int psy_lame_detect	(	AacPsyContext *	pctx,
		AacPsyChannel *	pch,
		const float *	la,
		int	channel,
		int	prev_type,
		int	attacks[AAC_NUM_BLOCKS_SHORT+1] )

static

Definition at line 1057 of file aacpsy.c.

Referenced by psy_lame_window(), and psy_lame_window_pair().

◆ psy_lame_apply()

static FFPsyWindowInfo psy_lame_apply	(	AacPsyContext *	pctx,
		AacPsyChannel *	pch,
		int	uselongblock,
		const int	attacks[AAC_NUM_BLOCKS_SHORT+1],
		int	prev_type,
		int	have_la )

static

Definition at line 1310 of file aacpsy.c.

Referenced by psy_lame_window(), and psy_lame_window_pair().

◆ psy_lame_window()

static FFPsyWindowInfo psy_lame_window	(	FFPsyContext *	ctx,
		const float *	audio,
		const float *	la,
		int	channel,
		int	prev_type )

static

Definition at line 1383 of file aacpsy.c.

◆ psy_lame_window_pair()

static void psy_lame_window_pair	(	FFPsyContext *	ctx,
		const float *	audio0,
		const float *	la0,
		const float *	audio1,
		const float *	la1,
		int	channel0,
		int	channel1,
		int	prev_type0,
		int	prev_type1,
		FFPsyWindowInfo	wi[2] )

static

Definition at line 1395 of file aacpsy.c.

Variable Documentation

◆ psy_abr_map

const PsyLamePreset psy_abr_map[]

static

Initial value:

= {
 
 
    {  8,  7.60},
    { 16,  7.60},
    { 24,  7.60},
    { 32,  7.60},
    { 40,  7.60},
    { 48,  7.60},
    { 56,  7.60},
    { 64,  7.40},
    { 80,  7.00},
    { 96,  6.60},
    {112,  6.20},
    {128,  6.20},
    {160,  6.20}
}

LAME psy model preset table for ABR.

Definition at line 257 of file aacpsy.c.

Referenced by lame_calc_attack_threshold().

◆ psy_vbr_map

const PsyLamePreset psy_vbr_map[]

static

Initial value:

= {
 
    { 0,  4.20},
    { 1,  4.20},
    { 2,  4.20},
    { 3,  4.20},
    { 4,  4.20},
    { 5,  4.20},
    { 6,  4.20},
    { 7,  4.20},
    { 8,  4.20},
    { 9,  4.20},
    {10,  4.20}
}

LAME psy model preset table for constant quality.

Definition at line 278 of file aacpsy.c.

Referenced by lame_window_init().

◆ psy_fir_coeffs

const float psy_fir_coeffs[]

static

Initial value:

= {
    -8.65163e-18 * 2, -0.00851586 * 2, -6.74764e-18 * 2, 0.0209036 * 2,
    -3.36639e-17 * 2, -0.0438162 * 2,  -1.54175e-17 * 2, 0.0931738 * 2,
    -5.52212e-17 * 2, -0.313819 * 2
}

LAME psy model FIR coefficient table.

Definition at line 296 of file aacpsy.c.

Referenced by psy_hp_filter(), and psy_lame_detect().

◆ window_grouping

const uint8_t window_grouping[9]

static

Initial value:

= {
    0xB6, 0x6C, 0xD8, 0xB2, 0x66, 0xC6, 0x96, 0x36, 0x36
}

window grouping information stored as bits (0 - new group, 1 - group continues)

Definition at line 482 of file aacpsy.c.

Referenced by psy_3gpp_window(), and psy_lame_apply().

◆ ff_aac_psy_model

const FFPsyModel ff_aac_psy_model

Initial value:

=
{
    .name    = "3GPP TS 26.403-inspired model",
    .init    = psy_3gpp_init,
    .window  = psy_lame_window,
    .analyze = psy_3gpp_analyze,
    .end     = psy_3gpp_end,
    .window_pair = psy_lame_window_pair,
}

Definition at line 1437 of file aacpsy.c.

Referenced by ff_psy_init().

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ PSY_3GPP_THR_SPREAD_HI

◆ PSY_3GPP_THR_SPREAD_LOW

◆ PSY_3GPP_EN_SPREAD_HI_L1

◆ PSY_3GPP_EN_SPREAD_HI_L2

◆ PSY_3GPP_EN_SPREAD_HI_S

◆ PSY_3GPP_EN_SPREAD_LOW_L

◆ PSY_3GPP_EN_SPREAD_LOW_S

◆ PSY_3GPP_RPEMIN

◆ PSY_3GPP_RPELEV

◆ PSY_3GPP_C1

◆ PSY_3GPP_C2

◆ PSY_3GPP_C3

◆ PSY_SNR_1DB

◆ PSY_SNR_25DB

◆ PSY_3GPP_SAVE_SLOPE_L

◆ PSY_3GPP_SAVE_SLOPE_S

◆ PSY_3GPP_SAVE_ADD_L

◆ PSY_3GPP_SAVE_ADD_S

◆ PSY_3GPP_SPEND_SLOPE_L

◆ PSY_3GPP_SPEND_SLOPE_S

◆ PSY_3GPP_SPEND_ADD_L

◆ PSY_3GPP_SPEND_ADD_S

◆ PSY_3GPP_CLIP_LO_L

◆ PSY_3GPP_CLIP_LO_S

◆ PSY_3GPP_CLIP_HI_L

◆ PSY_3GPP_CLIP_HI_S

◆ PSY_THRFL_QUALITY

◆ PSY_THRFL_CBR

◆ PSY_THRFL_CBR_KNEE

◆ PSY_3GPP_DEMAND_SCALE

◆ PSY_3GPP_AH_THR_LONG

◆ PSY_3GPP_AH_THR_SHORT

◆ PSY_PE_FORGET_SLOPE

◆ PSY_3GPP_BITS_TO_PE

◆ PSY_3GPP_PE_TO_BITS

◆ PSY_LAME_FIR_LEN

◆ AAC_BLOCK_SIZE_LONG

◆ AAC_BLOCK_SIZE_SHORT

◆ AAC_NUM_BLOCKS_SHORT

◆ PSY_LAME_NUM_SUBBLOCKS

◆ PSY_LAME_PE_GAP

◆ PSY_LAME_PE_QUIET

◆ PSY_LAME_PE_RED

◆ PSY_LAME_HIST

◆ PSY_LAME_NOV_BACK

◆ PSY_LAME_HFN_REL

◆ PSY_LAME_HFN_ABS

◆ PSY_LAME_HFN_PRE

◆ PSY_LAME_GAP_DEPTH

◆ PSY_LAME_GAP_BACK

◆ PSY_LAME_GAP_LEVEL

◆ PSY_LAME_GAP_FLOOR

◆ PSY_LAME_GAP_TOWER

◆ PSY_LAME_GRP_RATIO

◆ PSY_LAME_GRP_MAX

◆ ATH_ADD

Enumeration Type Documentation

◆ anonymous enum

Function Documentation

◆ lame_calc_attack_threshold()

◆ lame_window_init()

◆ calc_bark()

◆ ath()

◆ psy_3gpp_init()

◆ iir_filter()

◆ psy_3gpp_window()

◆ calc_bit_demand()

◆ calc_pe_3gpp()

◆ calc_reduction_3gpp()

◆ calc_reduced_thr_3gpp()

◆ calc_thr_3gpp()

◆ psy_hp_filter()

◆ psy_3gpp_analyze_channel()

◆ psy_3gpp_analyze()