#include <stdint.h>
#include "libavutil/channel_layout.h"
#include "libavutil/float_dsp.h"
#include "libavutil/fixed_dsp.h"
#include "libavutil/mem_internal.h"
#include "libavutil/tx.h"
#include "libavcodec/aac.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/mpeg4audio.h"
#include "aacdec_ac.h"

Data Structures
struct	LongTermPrediction
	Long Term Prediction. More...

struct	AACUsacElemData

struct	IndividualChannelStream
	Individual Channel Stream. More...

struct	TemporalNoiseShaping
	Temporal Noise Shaping. More...

struct	ChannelCoupling
	coupling parameters More...

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

struct	AACUsacStereo

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

struct	AACUSACLoudnessInfo

struct	AACUsacElemConfig

struct	AACUSACConfig

struct	OutputConfiguration

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

struct	AACDecProc
	Decode-specific primitives. More...

struct	AACDecDSP
	DSP-specific primitives. More...

struct	AACDecContext
	main AAC decoding context More...

Macros
#define	RENAME_FIXED(name) name ## _fixed

#define	INTFLOAT_UNION(name, elems)

#define	INTFLOAT_ALIGNED_UNION(alignment, name, nb_elems)

#define	NUM_TW_NODES 16

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

enum	AACOutputChannelOrder { CHANNEL_ORDER_DEFAULT, CHANNEL_ORDER_CODED }

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

enum	AACUsacElem { ID_USAC_SCE = 0, ID_USAC_CPE = 1, ID_USAC_LFE = 2, ID_USAC_EXT = 3 }

enum	ExtensionHeaderType { ID_CONFIG_EXT_FILL = 0, ID_CONFIG_EXT_LOUDNESS_INFO = 2, ID_CONFIG_EXT_STREAM_ID = 7 }

enum	AACUsacExtension { ID_EXT_ELE_FILL, ID_EXT_ELE_MPEGS, ID_EXT_ELE_SAOC, ID_EXT_ELE_AUDIOPREROLL, ID_EXT_ELE_UNI_DRC }

enum	AACUSACLoudnessExt { UNIDRCLOUDEXT_TERM = 0x0, UNIDRCLOUDEXT_EQ = 0x1 }

Functions
int	ff_aac_decode_init (AVCodecContext *avctx)

int	ff_aac_decode_init_float (AVCodecContext *avctx)

int	ff_aac_decode_init_fixed (AVCodecContext *avctx)
	Dequantization-related. More...

int	ff_aac_decode_ics (AACDecContext ac, SingleChannelElement sce, GetBitContext *gb, int common_window, int scale_flag)
	Decode an individual_channel_stream payload; reference: table 4.44. More...

int	ff_aac_decode_tns (AACDecContext ac, TemporalNoiseShaping tns, GetBitContext gb, const IndividualChannelStream ics)
	Decode Temporal Noise Shaping data; reference: table 4.48. More...

int	ff_aac_set_default_channel_config (AACDecContext ac, AVCodecContext avctx, uint8_t(layout_map)[3], int tags, int channel_config)
	Set up channel positions based on a default channel configuration as specified in table 1.17. More...

int	ff_aac_output_configure (AACDecContext ac, uint8_t layout_map[MAX_ELEM_ID 4][3], int tags, enum OCStatus oc_type, int get_new_frame)
	Configure output channel order based on the current program configuration element. More...

ChannelElement *	ff_aac_get_che (AACDecContext *ac, int type, int elem_id)

Detailed Description

AAC decoder definitions and structures

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

Definition in file aacdec.h.

Macro Definition Documentation

◆ RENAME_FIXED

#define RENAME_FIXED ( name ) name ## _fixed

Definition at line 101 of file aacdec.h.

◆ INTFLOAT_UNION

#define INTFLOAT_UNION	(	name,
		elems
	)

Value:

    union {                             \
        int   RENAME_FIXED(name) elems; \
        float name       elems;         \
    }

Definition at line 103 of file aacdec.h.

◆ INTFLOAT_ALIGNED_UNION

#define INTFLOAT_ALIGNED_UNION	(	alignment,
		name,
		nb_elems
	)

Value:

    union {                                                              \
        DECLARE_ALIGNED(alignment, int,   RENAME_FIXED(name))[nb_elems]; \
        DECLARE_ALIGNED(alignment, float, name)[nb_elems];               \
    }

Definition at line 109 of file aacdec.h.

◆ NUM_TW_NODES

#define NUM_TW_NODES 16

Definition at line 131 of file aacdec.h.

Enumeration Type Documentation

◆ OCStatus

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 52 of file aacdec.h.

◆ AACOutputChannelOrder

enum AACOutputChannelOrder

Enumerator
CHANNEL_ORDER_DEFAULT
CHANNEL_ORDER_CODED

Definition at line 60 of file aacdec.h.

◆ CouplingPoint

enum CouplingPoint

The point during decoding at which channel coupling is applied.

Enumerator
BEFORE_TNS
BETWEEN_TNS_AND_IMDCT
AFTER_IMDCT

Definition at line 68 of file aacdec.h.

◆ AACUsacElem

enum AACUsacElem

Enumerator
ID_USAC_SCE
ID_USAC_CPE
ID_USAC_LFE
ID_USAC_EXT

Definition at line 74 of file aacdec.h.

◆ ExtensionHeaderType

enum ExtensionHeaderType

Enumerator
ID_CONFIG_EXT_FILL
ID_CONFIG_EXT_LOUDNESS_INFO
ID_CONFIG_EXT_STREAM_ID

Definition at line 81 of file aacdec.h.

◆ AACUsacExtension

enum AACUsacExtension

Enumerator
ID_EXT_ELE_FILL
ID_EXT_ELE_MPEGS
ID_EXT_ELE_SAOC
ID_EXT_ELE_AUDIOPREROLL
ID_EXT_ELE_UNI_DRC

Definition at line 87 of file aacdec.h.

◆ AACUSACLoudnessExt

enum AACUSACLoudnessExt

Enumerator
UNIDRCLOUDEXT_TERM
UNIDRCLOUDEXT_EQ

Definition at line 95 of file aacdec.h.

Function Documentation

◆ ff_aac_decode_init()

int ff_aac_decode_init ( AVCodecContext * avctx )

Definition at line 1177 of file aacdec.c.

Referenced by ff_aac_decode_init_fixed(), and ff_aac_decode_init_float().

◆ ff_aac_decode_init_float()

int ff_aac_decode_init_float ( AVCodecContext * avctx )

Definition at line 164 of file aacdec_float.c.

Referenced by latm_decode_init().

◆ ff_aac_decode_init_fixed()

int ff_aac_decode_init_fixed ( AVCodecContext * avctx )

Dequantization-related.

Definition at line 87 of file aacdec_fixed.c.

◆ ff_aac_decode_ics()

int ff_aac_decode_ics	(	AACDecContext *	ac,
		SingleChannelElement *	sce,
		GetBitContext *	gb,
		int	common_window,
		int	scale_flag
	)

Decode an individual_channel_stream payload; reference: table 4.44.

Parameters

common_window	Channels have independent [0], or shared [1], Individual Channel Stream information.
scale_flag	scalable [1] or non-scalable [0] AAC (Unused until scalable AAC is implemented.)

Returns: Returns error status. 0 - OK, !0 - error

Definition at line 1664 of file aacdec.c.

Referenced by aac_decode_er_frame(), decode_cce(), decode_cpe(), and decode_frame_ga().

◆ ff_aac_decode_tns()

int ff_aac_decode_tns	(	AACDecContext *	ac,
		TemporalNoiseShaping *	tns,
		GetBitContext *	gb,
		const IndividualChannelStream *	ics
	)

Decode Temporal Noise Shaping data; reference: table 4.48.

Returns: Returns error status. 0 - OK, !0 - error

Definition at line 1557 of file aacdec.c.

Referenced by decode_usac_core_coder(), decode_usac_stereo_info(), and ff_aac_decode_ics().

◆ ff_aac_set_default_channel_config()

int ff_aac_set_default_channel_config	(	AACDecContext *	ac,
		AVCodecContext *	avctx,
		uint8_t(*)	layout_map[3],
		int *	tags,
		int	channel_config
	)

Set up channel positions based on a default channel configuration as specified in table 1.17.

Returns: Returns error status. 0 - OK, !0 - error

Definition at line 552 of file aacdec.c.

Referenced by decode_eld_specific_config(), decode_ga_specific_config(), ff_aac_decode_init(), ff_aac_get_che(), ff_aac_usac_config_decode(), and parse_adts_frame_header().

◆ ff_aac_output_configure()

int ff_aac_output_configure	(	AACDecContext *	ac,
		uint8_t	layout_map[MAX_ELEM_ID *4][3],
		int	tags,
		enum OCStatus	oc_type,
		int	get_new_frame
	)

Configure output channel order based on the current program configuration element.

Returns: Returns error status. 0 - OK, !0 - error

Definition at line 459 of file aacdec.c.

Referenced by decode_eld_specific_config(), decode_extension_payload(), decode_frame_ga(), decode_ga_specific_config(), ff_aac_decode_init(), ff_aac_get_che(), ff_aac_usac_config_decode(), ff_aac_usac_decode_frame(), parse_adts_frame_header(), and pop_output_configuration().

◆ ff_aac_get_che()

ChannelElement* ff_aac_get_che	(	AACDecContext *	ac,
		int	type,
		int	elem_id
	)

Definition at line 592 of file aacdec.c.

Referenced by aac_decode_er_frame(), decode_frame_ga(), ff_aac_usac_decode_frame(), and ff_aac_usac_reset_state().

Data Structures

Macros

Enumerations

Functions