aaccoder.c File Reference

AAC coefficients encoder. More...

#include "libavutil/libm.h"
#include <float.h>
#include "libavutil/mathematics.h"
#include "mathops.h"
#include "avcodec.h"
#include "put_bits.h"
#include "aac.h"
#include "aacenc.h"
#include "aactab.h"
#include "aacenctab.h"
#include "aacenc_utils.h"
#include "aacenc_quantization.h"
#include "aacenc_is.h"
#include "aacenc_tns.h"
#include "aacenc_ltp.h"
#include "aacenc_pred.h"
#include "libavcodec/aaccoder_twoloop.h"
#include "libavcodec/aaccoder_trellis.h"

Go to the source code of this file.

Data Structures
struct	BandCodingPath
	structure used in optimal codebook search More...
struct	TrellisPath

Macros
#define	NOISE_SPREAD_THRESHOLD   0.9f
#define	NOISE_LAMBDA_REPLACE   1.948f
#define	TRELLIS_STAGES   121
#define	TRELLIS_STATES   (SCALE_MAX_DIFF+1)

Functions
static void	encode_window_bands_info (AACEncContext *s, SingleChannelElement *sce, int win, int group_len, const float lambda)
	Encode band info for single window group bands. More...
static void	set_special_band_scalefactors (AACEncContext *s, SingleChannelElement *sce)
static void	search_for_quantizers_anmr (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
static void	search_for_quantizers_fast (AVCodecContext *avctx, AACEncContext *s, SingleChannelElement *sce, const float lambda)
static void	search_for_pns (AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
static void	mark_pns (AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce)
static void	search_for_ms (AACEncContext *s, ChannelElement *cpe)

Variables
const AACCoefficientsEncoder	ff_aac_coders [AAC_CODER_NB]

Detailed Description

AAC coefficients encoder.

Definition in file aaccoder.c.

Macro Definition Documentation

NOISE_SPREAD_THRESHOLD

#define NOISE_SPREAD_THRESHOLD   0.9f

Definition at line 57 of file aaccoder.c.

Referenced by mark_pns(), and search_for_pns().

NOISE_LAMBDA_REPLACE

#define NOISE_LAMBDA_REPLACE   1.948f

Definition at line 61 of file aaccoder.c.

Referenced by search_for_pns().

TRELLIS_STAGES

#define TRELLIS_STAGES   121

Definition at line 193 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

TRELLIS_STATES

#define TRELLIS_STATES   (SCALE_MAX_DIFF+1)

Definition at line 194 of file aaccoder.c.

Referenced by search_for_quantizers_anmr().

Function Documentation

encode_window_bands_info()

static void encode_window_bands_info ( AACEncContext *  s, SingleChannelElement *  sce, int  win, int  group_len, const float  lambda  )

static

Encode band info for single window group bands.

Definition at line 77 of file aaccoder.c.

set_special_band_scalefactors()

static void set_special_band_scalefactors ( AACEncContext *  s, SingleChannelElement *  sce  )

static

Definition at line 196 of file aaccoder.c.

search_for_quantizers_anmr()

static void search_for_quantizers_anmr ( AVCodecContext *  avctx, AACEncContext *  s, SingleChannelElement *  sce, const float  lambda  )

static

Definition at line 235 of file aaccoder.c.

search_for_quantizers_fast()

static void search_for_quantizers_fast ( AVCodecContext *  avctx, AACEncContext *  s, SingleChannelElement *  sce, const float  lambda  )

static

Definition at line 395 of file aaccoder.c.

search_for_pns()

static void search_for_pns ( AACEncContext *  s, AVCodecContext *  avctx, SingleChannelElement *  sce  )

static

Keep this in sync with twoloop's cutoff selection

Definition at line 543 of file aaccoder.c.

mark_pns()

static void mark_pns ( AACEncContext *  s, AVCodecContext *  avctx, SingleChannelElement *  sce  )

static

Keep this in sync with twoloop's cutoff selection

Definition at line 685 of file aaccoder.c.

search_for_ms()

static void search_for_ms ( AACEncContext *  s, ChannelElement *  cpe  )

static

Scout out next nonzero bands

Definition at line 756 of file aaccoder.c.

Variable Documentation

ff_aac_coders

const AACCoefficientsEncoder ff_aac_coders[AAC_CODER_NB]

Definition at line 897 of file aaccoder.c.

Referenced by aac_encode_init().