libavcodec/aac.h File Reference

AAC definitions and structures. More...

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

Go to the source code of this file.

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 alac_decode_close(), alac_decode_frame(), allocate_buffers(), decode_drc_channel_exclusions(), encode_block(), encode_init(), pcm_decode_frame(), shorten_decode_frame(), wma_decode_block(), and wma_decode_init().

#define MAX_ELEM_ID 16

Definition at line 47 of file aac.h.

Referenced by aac_decode_close(), aac_decode_frame(), aac_decode_init(), apply_channel_coupling(), decode_ga_specific_config(), and spectral_to_sample().

#define MAX_PREDICTORS 672

Definition at line 148 of file aac.h.

Referenced by reset_all_predictors(), and reset_predictor_group().

#define TNS_MAX_ORDER 20

Definition at line 49 of file aac.h.

Referenced by apply_tns().

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.


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...