AAC definitions and structures. More...

#include "libavutil/internal.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpeg4audio.h"
#include <stdint.h>

Data Structures
struct	PredictorState
	Predictor State. 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	AAC_INIT_VLC_STATIC(num, size)
#define	MAX_CHANNELS 64
#define	MAX_ELEM_ID 16
#define	TNS_MAX_ORDER 20
#define	IS_CODEBOOK_UNSIGNED(x) ((x - 1) & 10)
#define	MAX_PREDICTORS 672
Enumerations
enum	AudioObjectType { AOT_NULL, AOT_AAC_MAIN, AOT_AAC_LC, AOT_AAC_SSR, AOT_AAC_LTP, AOT_SBR, AOT_AAC_SCALABLE, AOT_TWINVQ, AOT_CELP, AOT_HVXC, AOT_TTSI = 12, AOT_MAINSYNTH, AOT_WAVESYNTH, AOT_MIDI, AOT_SAFX, AOT_ER_AAC_LC, AOT_ER_AAC_LTP = 19, AOT_ER_AAC_SCALABLE, AOT_ER_TWINVQ, AOT_ER_BSAC, AOT_ER_AAC_LD, AOT_ER_CELP, AOT_ER_HVXC, AOT_ER_HILN, AOT_ER_PARAM, AOT_SSC }
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...

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 AAC_INIT_VLC_STATIC	(	num,
		size
	)

Value:

INIT_VLC_STATIC(&vlc_spectral[num], 6, ff_aac_spectral_sizes[num], \
         ff_aac_spectral_bits[num], sizeof( ff_aac_spectral_bits[num][0]), sizeof( ff_aac_spectral_bits[num][0]), \
        ff_aac_spectral_codes[num], sizeof(ff_aac_spectral_codes[num][0]), sizeof(ff_aac_spectral_codes[num][0]), \
        size);

Definition at line 40 of file aac.h.

Referenced by aac_decode_init().

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

Definition at line 117 of file aac.h.

Referenced by decode_spectrum_and_dequant().

#define MAX_CHANNELS 64

Definition at line 46 of file aac.h.

Referenced by decode_drc_channel_exclusions(), and encode_init().

#define MAX_ELEM_ID 16

Definition at line 47 of file aac.h.

Referenced by aac_decode_frame(), aac_decode_init(), and decode_ga_specific_config().

#define MAX_PREDICTORS 672

Definition at line 148 of file aac.h.

#define TNS_MAX_ORDER 20

Definition at line 49 of file aac.h.

Enumeration Type Documentation

enum AudioObjectType

Enumerator:

AOT_NULL
AOT_AAC_MAIN	Y Main.
AOT_AAC_LC	Y Low Complexity.
AOT_AAC_SSR	N (code in SoC repo) Scalable Sample Rate.
AOT_AAC_LTP	N (code in SoC repo) Long Term Prediction.
AOT_SBR	N (in progress) Spectral Band Replication.
AOT_AAC_SCALABLE	N Scalable.
AOT_TWINVQ	N Twin Vector Quantizer.
AOT_CELP	N Code Excited Linear Prediction.
AOT_HVXC	N Harmonic Vector eXcitation Coding.
AOT_TTSI	N Text-To-Speech Interface.
AOT_MAINSYNTH	N Main Synthesis.
AOT_WAVESYNTH	N Wavetable Synthesis.
AOT_MIDI	N General MIDI.
AOT_SAFX	N Algorithmic Synthesis and Audio Effects.
AOT_ER_AAC_LC	N Error Resilient Low Complexity.
AOT_ER_AAC_LTP	N Error Resilient Long Term Prediction.
AOT_ER_AAC_SCALABLE	N Error Resilient Scalable.
AOT_ER_TWINVQ	N Error Resilient Twin Vector Quantizer.
AOT_ER_BSAC	N Error Resilient Bit-Sliced Arithmetic Coding.
AOT_ER_AAC_LD	N Error Resilient Low Delay.
AOT_ER_CELP	N Error Resilient Code Excited Linear Prediction.
AOT_ER_HVXC	N Error Resilient Harmonic Vector eXcitation Coding.
AOT_ER_HILN	N Error Resilient Harmonic and Individual Lines plus Noise.
AOT_ER_PARAM	N Error Resilient Parametric.
AOT_SSC	N SinuSoidal Coding.

Definition at line 51 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 108 of file aac.h.

enum ChannelPosition

Enumerator:

AAC_CHANNEL_FRONT
AAC_CHANNEL_SIDE
AAC_CHANNEL_BACK
AAC_CHANNEL_LFE
AAC_CHANNEL_CC

Definition at line 119 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 130 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 92 of file aac.h.

enum RawDataBlockType

Enumerator:

TYPE_SCE
TYPE_CPE
TYPE_CCE
TYPE_LFE
TYPE_DSE
TYPE_PCE
TYPE_FIL
TYPE_END

Definition at line 81 of file aac.h.

enum WindowSequence

Enumerator:

ONLY_LONG_SEQUENCE
LONG_START_SEQUENCE
EIGHT_SHORT_SEQUENCE
LONG_STOP_SEQUENCE

Definition at line 101 of file aac.h.

libavcodec/aac.h File Reference

Data Structures

Defines

Enumerations

Detailed Description

Define Documentation

Enumeration Type Documentation