AAC definitions and structures. More...

#include "aac_defines.h"
#include "libavutil/float_dsp.h"
#include "libavutil/fixed_dsp.h"
#include "avcodec.h"
#include "imdct15.h"
#include "fft.h"
#include "mpeg4audio.h"
#include "sbr.h"
#include <stdint.h>

Data Structures
struct	OutputConfiguration

struct	PredictorState
	Predictor State. More...

struct	LongTermPrediction
	Long Term Prediction. More...

struct	IndividualChannelStream
	Individual Channel Stream. More...

struct	TemporalNoiseShaping
	Temporal Noise Shaping. More...

struct	DynamicRangeControl
	Dynamic Range Control - decoded from the bitstream but not processed further. More...

struct	Pulse

struct	ChannelCoupling
	coupling parameters More...

struct	SingleChannelElement
	Single Channel Element - used for both SCE and LFE elements. More...

struct	ChannelElement
	channel element - generic struct for SCE/CPE/CCE/LFE More...

struct	AACContext
	main AAC context More...

Macros
#define	MAX_CHANNELS 64

#define	MAX_ELEM_ID 16

#define	TNS_MAX_ORDER 20

#define	MAX_LTP_LONG_SFB 40

#define	CLIP_AVOIDANCE_FACTOR 0.95f

#define	IS_CODEBOOK_UNSIGNED(x) (((x) - 1) & 10)

#define	MAX_PREDICTORS 672

#define	SCALE_DIV_512 36
	scalefactor difference that corresponds to scale difference in 512 times More...

#define	SCALE_ONE_POS 140
	scalefactor index that corresponds to scale=1.0 More...

#define	SCALE_MAX_POS 255
	scalefactor index maximum value More...

#define	SCALE_MAX_DIFF 60
	maximum scalefactor difference allowed by standard More...

#define	SCALE_DIFF_ZERO 60
	codebook index corresponding to zero scalefactor indices difference More...

#define	POW_SF2_ZERO 200
	ff_aac_pow2sf_tab index corresponding to pow(2, 0); More...

#define	NOISE_PRE 256
	preamble for NOISE_BT, put in bitstream with the first noise band More...

#define	NOISE_PRE_BITS 9
	length of preamble More...

#define	NOISE_OFFSET 90
	subtracted from global gain, used as offset for the preamble More...

Enumerations
enum	RawDataBlockType { TYPE_SCE, TYPE_CPE, TYPE_CCE, TYPE_LFE, TYPE_DSE, TYPE_PCE, TYPE_FIL, TYPE_END }

enum	ExtensionPayloadID { EXT_FILL, EXT_FILL_DATA, EXT_DATA_ELEMENT, EXT_DYNAMIC_RANGE = 0xb, EXT_SBR_DATA = 0xd, EXT_SBR_DATA_CRC = 0xe }

enum	WindowSequence { ONLY_LONG_SEQUENCE, LONG_START_SEQUENCE, EIGHT_SHORT_SEQUENCE, LONG_STOP_SEQUENCE }

enum	BandType { ZERO_BT = 0, FIRST_PAIR_BT = 5, ESC_BT = 11, RESERVED_BT = 12, NOISE_BT = 13, INTENSITY_BT2 = 14, INTENSITY_BT = 15 }

enum	ChannelPosition { AAC_CHANNEL_OFF = 0, AAC_CHANNEL_FRONT = 1, AAC_CHANNEL_SIDE = 2, AAC_CHANNEL_BACK = 3, AAC_CHANNEL_LFE = 4, AAC_CHANNEL_CC = 5 }

enum	CouplingPoint { BEFORE_TNS, BETWEEN_TNS_AND_IMDCT, AFTER_IMDCT = 3 }
	The point during decoding at which channel coupling is applied. More...

enum	OCStatus { OC_NONE, OC_TRIAL_PCE, OC_TRIAL_FRAME, OC_GLOBAL_HDR, OC_LOCKED }
	Output configuration status. More...

Functions
void	ff_aacdec_init_mips (AACContext *c)

Detailed Description

AAC definitions and structures.

Author: Oded Shimon ( ods15 ods15 dyndns org ); Maxim Gavrilov ( maxim.gavrilov gmail com )

Definition in file aac.h.

Macro Definition Documentation

#define MAX_CHANNELS 64

Definition at line 47 of file aac.h.

Referenced by aac_decode_init(), che_configure(), decode_drc_channel_exclusions(), encode_block(), encode_init(), ff_mlp_rematrix_channel(), mlp_filter_channel(), wma_decode_block(), and wma_decode_init().

#define MAX_ELEM_ID 16

Definition at line 48 of file aac.h.

Referenced by aac_decode_close(), apply_channel_coupling(), flush(), frame_configure_elements(), output_configure(), sniff_channel_order(), and spectral_to_sample().

#define TNS_MAX_ORDER 20

Definition at line 50 of file aac.h.

Referenced by aac_encode_init(), apply_tns(), ff_aac_apply_tns(), and ff_aac_search_for_tns().

#define MAX_LTP_LONG_SFB 40

Definition at line 51 of file aac.h.

Referenced by apply_ltp(), decode_ltp(), ff_aac_adjust_common_ltp(), ff_aac_encode_ltp_info(), and ff_aac_search_for_ltp().

#define CLIP_AVOIDANCE_FACTOR 0.95f

Definition at line 53 of file aac.h.

Referenced by aac_encode_frame().

#define IS_CODEBOOK_UNSIGNED ( x ) (((x) - 1) & 10)

Definition at line 92 of file aac.h.

#define MAX_PREDICTORS 672

Definition at line 146 of file aac.h.

Referenced by ff_aac_search_for_pred(), reset_all_predictors(), and reset_predictor_group().

#define SCALE_DIV_512 36

scalefactor difference that corresponds to scale difference in 512 times

Definition at line 148 of file aac.h.

Referenced by coef2maxsf(), coef2minsf(), find_min_book(), quantize_and_encode_band_cost_template(), search_for_ms(), search_for_quantizers_anmr(), search_for_quantizers_fast(), and search_for_quantizers_twoloop().

#define SCALE_ONE_POS 140

scalefactor index that corresponds to scale=1.0

Definition at line 149 of file aac.h.

Referenced by coef2maxsf(), coef2minsf(), find_min_book(), quantize_and_encode_band_cost_template(), search_for_quantizers_anmr(), search_for_quantizers_fast(), and search_for_quantizers_twoloop().

#define SCALE_MAX_POS 255

scalefactor index maximum value

Definition at line 150 of file aac.h.

Referenced by search_for_ms(), search_for_quantizers_anmr(), and search_for_quantizers_twoloop().

#define SCALE_MAX_DIFF 60

maximum scalefactor difference allowed by standard

Definition at line 151 of file aac.h.

Referenced by ff_sfdelta_can_remove_band(), ff_sfdelta_can_replace(), search_for_pns(), search_for_quantizers_twoloop(), and set_special_band_scalefactors().

#define SCALE_DIFF_ZERO 60

codebook index corresponding to zero scalefactor indices difference

Definition at line 152 of file aac.h.

Referenced by decode_scalefactors(), encode_scale_factors(), search_for_pns(), search_for_quantizers_anmr(), and search_for_quantizers_twoloop().

#define POW_SF2_ZERO 200

ff_aac_pow2sf_tab index corresponding to pow(2, 0);

Definition at line 154 of file aac.h.

Referenced by decode_scalefactors(), find_min_book(), quantize_and_encode_band_cost_template(), and search_for_pns().

#define NOISE_PRE 256

preamble for NOISE_BT, put in bitstream with the first noise band

Definition at line 156 of file aac.h.

Referenced by decode_scalefactors(), and encode_scale_factors().

#define NOISE_PRE_BITS 9

length of preamble

Definition at line 157 of file aac.h.

Referenced by decode_scalefactors(), and encode_scale_factors().

#define NOISE_OFFSET 90

subtracted from global gain, used as offset for the preamble

Definition at line 158 of file aac.h.

Referenced by decode_scalefactors(), and encode_scale_factors().

Enumeration Type Documentation

enum RawDataBlockType

Enumerator
TYPE_SCE
TYPE_CPE
TYPE_CCE
TYPE_LFE
TYPE_DSE
TYPE_PCE
TYPE_FIL
TYPE_END

Definition at line 55 of file aac.h.

enum ExtensionPayloadID

Enumerator
EXT_FILL
EXT_FILL_DATA
EXT_DATA_ELEMENT
EXT_DYNAMIC_RANGE
EXT_SBR_DATA
EXT_SBR_DATA_CRC

Definition at line 66 of file aac.h.

enum WindowSequence

Enumerator
ONLY_LONG_SEQUENCE
LONG_START_SEQUENCE
EIGHT_SHORT_SEQUENCE
LONG_STOP_SEQUENCE

Definition at line 75 of file aac.h.

enum BandType

Enumerator
ZERO_BT	Scalefactors and spectral data are all zero.
FIRST_PAIR_BT	This and later band types encode two values (rather than four) with one code word.
ESC_BT	Spectral data are coded with an escape sequence.
RESERVED_BT	Band types following are encoded differently from others.
NOISE_BT	Spectral data are scaled white noise not coded in the bitstream.
INTENSITY_BT2	Scalefactor data are intensity stereo positions (out of phase).
INTENSITY_BT	Scalefactor data are intensity stereo positions (in phase).

Definition at line 82 of file aac.h.

enum ChannelPosition

Enumerator
AAC_CHANNEL_OFF
AAC_CHANNEL_FRONT
AAC_CHANNEL_SIDE
AAC_CHANNEL_BACK
AAC_CHANNEL_LFE
AAC_CHANNEL_CC

Definition at line 94 of file aac.h.

enum CouplingPoint

The point during decoding at which channel coupling is applied.

Enumerator
BEFORE_TNS
BETWEEN_TNS_AND_IMDCT
AFTER_IMDCT

Definition at line 106 of file aac.h.

enum OCStatus

Output configuration status.

Enumerator
OC_NONE	Output unconfigured.
OC_TRIAL_PCE	Output configuration under trial specified by an inband PCE.
OC_TRIAL_FRAME	Output configuration under trial specified by a frame header.
OC_GLOBAL_HDR	Output configuration set in a global header but not yet locked.
OC_LOCKED	Output configuration locked in place.

Definition at line 115 of file aac.h.

Function Documentation

void ff_aacdec_init_mips ( AACContext * c )

Definition at line 433 of file aacdec_mips.c.

Referenced by aacdec_init().

Data Structures

Macros

Enumerations

Functions

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation