aac.h File Reference

AAC definitions and structures. More...

#include "libavutil/float_dsp.h"
#include "avcodec.h"
#include "fft.h"
#include "mpeg4audio.h"
#include "sbr.h"
#include "fmtconvert.h"
#include <stdint.h>

Go to the source code of this file.

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	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
#define	SCALE_ONE_POS   140
	scalefactor index that corresponds to scale=1.0
#define	SCALE_MAX_POS   255
	scalefactor index maximum value
#define	SCALE_MAX_DIFF   60
	maximum scalefactor difference allowed by standard
#define	SCALE_DIFF_ZERO   60
	codebook index corresponding to zero scalefactor indices difference

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, 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 42 of file aac.h.

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

#define MAX_ELEM_ID   16

Definition at line 43 of file aac.h.

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

#define TNS_MAX_ORDER   20

Definition at line 45 of file aac.h.

Referenced by apply_tns().

#define MAX_LTP_LONG_SFB   40

Definition at line 46 of file aac.h.

Referenced by apply_ltp(), and decode_ltp().

#define IS_CODEBOOK_UNSIGNED

(

x

)

((x - 1) & 10)

Definition at line 84 of file aac.h.

#define MAX_PREDICTORS   672

Definition at line 136 of file aac.h.

Referenced by 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 138 of file aac.h.

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

#define SCALE_ONE_POS   140

scalefactor index that corresponds to scale=1.0

Definition at line 139 of file aac.h.

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

#define SCALE_MAX_POS   255

scalefactor index maximum value

Definition at line 140 of file aac.h.

Referenced by search_for_quantizers_faac().

#define SCALE_MAX_DIFF   60

maximum scalefactor difference allowed by standard

Definition at line 141 of file aac.h.

Referenced by search_for_quantizers_faac(), and search_for_quantizers_twoloop().

#define SCALE_DIFF_ZERO   60

codebook index corresponding to zero scalefactor indices difference

Definition at line 142 of file aac.h.

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

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 48 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 59 of file aac.h.

enum WindowSequence

Enumerator:

ONLY_LONG_SEQUENCE
LONG_START_SEQUENCE
EIGHT_SHORT_SEQUENCE
LONG_STOP_SEQUENCE

Definition at line 68 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.
NOISE_BT	Spectral data are scaled white noise not coded in the bitstream.
INTENSITY_BT2	Scalefactor data are intensity stereo positions.
INTENSITY_BT	Scalefactor data are intensity stereo positions.

Definition at line 75 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 86 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 98 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 107 of file aac.h.

Function Documentation

void ff_aacdec_init_mips

(

AACContext *

c

)

Definition at line 822 of file aacdec_mips.c.

Referenced by aacdec_init().