aacdec.h File Reference

#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/mpeg4audio.h"

Go to the source code of this file.

Data Structures
struct	LongTermPrediction
	Long Term Prediction. More...
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	ChannelElement
	channel element - generic struct for SCE/CPE/CCE/LFE More...
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)

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...

Functions
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...

Variables
const AACDecDSP	aac_dsp
const AACDecDSP	aac_dsp_fixed
const AACDecProc	aac_proc
const AACDecProc	aac_proc_fixed

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 72 of file aacdec.h.

INTFLOAT_UNION

#define INTFLOAT_UNION	(		name,
			elems
	)

Value:

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

Definition at line 74 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 80 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 49 of file aacdec.h.

AACOutputChannelOrder

enum AACOutputChannelOrder

Enumerator
CHANNEL_ORDER_DEFAULT
CHANNEL_ORDER_CODED

Definition at line 57 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 65 of file aacdec.h.

Function Documentation

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 1695 of file aacdec.c.

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

Variable Documentation

aac_dsp

const AACDecDSP aac_dsp

Referenced by init_dsp().

aac_dsp_fixed

const AACDecDSP aac_dsp_fixed

Referenced by init_dsp().

aac_proc

const AACDecProc aac_proc

Referenced by init_dsp().

aac_proc_fixed

const AACDecProc aac_proc_fixed

Referenced by init_dsp().