eac3dec.c File Reference

#include "avcodec.h"
#include "ac3.h"
#include "ac3_parser_internal.h"
#include "ac3dec.h"
#include "ac3dec_data.h"
#include "eac3_data.h"

Go to the source code of this file.

Macros
#define	EAC3_SR_CODE_REDUCED   3
#define	COEFF_0   10273905LL
	lrint(M_SQRT2*cos(2*M_PI/12)*(1<<23)) More...
#define	COEFF_1   11863283LL
	lrint(M_SQRT2*cos(0*M_PI/12)*(1<<23)) = lrint(M_SQRT2*(1<<23)) More...
#define	COEFF_2   3070444LL
	lrint(M_SQRT2*cos(5*M_PI/12)*(1<<23)) More...

Enumerations
enum	EAC3GaqMode { EAC3_GAQ_NO =0, EAC3_GAQ_12, EAC3_GAQ_14, EAC3_GAQ_124 }
	gain adaptive quantization mode More...

Functions
static void	ff_eac3_apply_spectral_extension (AC3DecodeContext *s)
static void	idct6 (int pre_mant[6])
	Calculate 6-point IDCT of the pre-mantissas. More...
static void	ff_eac3_decode_transform_coeffs_aht_ch (AC3DecodeContext *s, int ch)
static int	ff_eac3_parse_header (AC3DecodeContext *s)

Macro Definition Documentation

EAC3_SR_CODE_REDUCED

#define EAC3_SR_CODE_REDUCED   3

Definition at line 56 of file eac3dec.c.

COEFF_0

#define COEFF_0   10273905LL

lrint(M_SQRT2*cos(2*M_PI/12)*(1<<23))

Definition at line 155 of file eac3dec.c.

COEFF_1

#define COEFF_1   11863283LL

lrint(M_SQRT2*cos(0*M_PI/12)*(1<<23)) = lrint(M_SQRT2*(1<<23))

Definition at line 158 of file eac3dec.c.

COEFF_2

#define COEFF_2   3070444LL

lrint(M_SQRT2*cos(5*M_PI/12)*(1<<23))

Definition at line 161 of file eac3dec.c.

Enumeration Type Documentation

EAC3GaqMode

enum EAC3GaqMode

gain adaptive quantization mode

Enumerator
EAC3_GAQ_NO
EAC3_GAQ_12
EAC3_GAQ_14
EAC3_GAQ_124

Definition at line 49 of file eac3dec.c.

Function Documentation

ff_eac3_apply_spectral_extension()

static void ff_eac3_apply_spectral_extension ( AC3DecodeContext *  s )

static

Definition at line 58 of file eac3dec.c.

Referenced by decode_audio_block().

idct6()

static void idct6 ( int  pre_mant[6] )

static

Calculate 6-point IDCT of the pre-mantissas.

All calculations are 24-bit fixed-point.

Definition at line 167 of file eac3dec.c.

Referenced by ff_eac3_decode_transform_coeffs_aht_ch().

ff_eac3_decode_transform_coeffs_aht_ch()

static void ff_eac3_decode_transform_coeffs_aht_ch ( AC3DecodeContext *  s, int  ch  )

static

Definition at line 197 of file eac3dec.c.

Referenced by decode_transform_coeffs_ch().

ff_eac3_parse_header()

static int ff_eac3_parse_header ( AC3DecodeContext *  s )

static

Definition at line 290 of file eac3dec.c.

Referenced by parse_frame_header().