libavcodec/aac.h File Reference

AAC definitions and structures. More...

#include "avcodec.h"
#include "dsputil.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  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...

Defines

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

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_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...


Detailed Description

AAC definitions and structures.

Author:
Oded Shimon ( ods15 ods15 dyndns org )

Maxim Gavrilov ( maxim.gavrilov gmail com )

Definition in file aac.h.


Define Documentation

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

Definition at line 84 of file aac.h.

#define MAX_CHANNELS   64

#define MAX_ELEM_ID   16

#define MAX_LTP_LONG_SFB   40

Definition at line 46 of file aac.h.

Referenced by apply_ltp(), and decode_ltp().

#define MAX_PREDICTORS   672

Definition at line 126 of file aac.h.

Referenced by reset_all_predictors(), and reset_predictor_group().

#define POW_SF2_ZERO   200

ff_aac_pow2sf_tab index corresponding to pow(2, 0);

Definition at line 133 of file aac.h.

Referenced by decode_scalefactors(), ff_aac_tableinit(), find_min_book(), quantize_and_encode_band_cost_template(), and search_for_quantizers_faac().

#define SCALE_DIFF_ZERO   60

codebook index corresponding to zero scalefactor indices difference

Definition at line 132 of file aac.h.

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

#define SCALE_DIV_512   36

scalefactor difference that corresponds to scale difference in 512 times

Definition at line 128 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_MAX_DIFF   60

maximum scalefactor difference allowed by standard

Definition at line 131 of file aac.h.

Referenced by search_for_quantizers_faac(), and search_for_quantizers_twoloop().

#define SCALE_MAX_POS   255

scalefactor index maximum value

Definition at line 130 of file aac.h.

Referenced by search_for_quantizers_faac().

#define SCALE_ONE_POS   140

#define TNS_MAX_ORDER   20

Definition at line 45 of file aac.h.

Referenced by apply_tns().


Enumeration Type Documentation

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.

Enumerator:
AAC_CHANNEL_FRONT 
AAC_CHANNEL_SIDE 
AAC_CHANNEL_BACK 
AAC_CHANNEL_LFE 
AAC_CHANNEL_CC 

Definition at line 86 of file aac.h.

The point during decoding at which channel coupling is applied.

Enumerator:
BEFORE_TNS 
BETWEEN_TNS_AND_IMDCT 
AFTER_IMDCT 

Definition at line 97 of file aac.h.

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 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 106 of file aac.h.

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.

Enumerator:
ONLY_LONG_SEQUENCE 
LONG_START_SEQUENCE 
EIGHT_SHORT_SEQUENCE 
LONG_STOP_SEQUENCE 

Definition at line 68 of file aac.h.


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