libavcodec/eac3dec.c File Reference

#include "avcodec.h"
#include "internal.h"
#include "aac_ac3_parser.h"
#include "ac3.h"
#include "ac3_parser.h"
#include "ac3dec.h"
#include "ac3dec_data.h"

Go to the source code of this file.

Defines
#define	EAC3_SR_CODE_REDUCED   3
#define	COEFF_0   10273905LL
	lrint(M_SQRT2*cos(2*M_PI/12)*(1<<23))
#define	COEFF_1   11863283LL
	lrint(M_SQRT2*cos(0*M_PI/12)*(1<<23)) = lrint(M_SQRT2*(1<<23))
#define	COEFF_2   3070444LL
	lrint(M_SQRT2*cos(5*M_PI/12)*(1<<23))
Enumerations
enum	EAC3GaqMode { EAC3_GAQ_NO = 0, EAC3_GAQ_12, EAC3_GAQ_14, EAC3_GAQ_124 }
	gain adaptive quantization mode More...
Functions
static void	idct6 (int pre_mant[6])
	Calculate 6-point IDCT of the pre-mantissas.
void	ff_eac3_decode_transform_coeffs_aht_ch (AC3DecodeContext *s, int ch)
	Decode mantissas in a single channel for the entire frame.
int	ff_eac3_parse_header (AC3DecodeContext *s)
	Parse the E-AC-3 frame header.

---

Define Documentation

#define COEFF_0   10273905LL

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

Definition at line 42 of file eac3dec.c.

Referenced by idct6().

#define COEFF_1   11863283LL

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

Definition at line 45 of file eac3dec.c.

Referenced by idct6().

#define COEFF_2   3070444LL

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

Definition at line 48 of file eac3dec.c.

Referenced by idct6().

#define EAC3_SR_CODE_REDUCED   3

Definition at line 39 of file eac3dec.c.

Referenced by ff_eac3_parse_header().

---

Enumeration Type Documentation

enum EAC3GaqMode

gain adaptive quantization mode

Enumerator:

EAC3_GAQ_NO
EAC3_GAQ_12
EAC3_GAQ_14
EAC3_GAQ_124

Definition at line 32 of file eac3dec.c.

---

Function Documentation

void ff_eac3_decode_transform_coeffs_aht_ch	(	AC3DecodeContext *	s,
		int	ch
	)

Decode mantissas in a single channel for the entire frame.

This is used when AHT mode is enabled.

Definition at line 84 of file eac3dec.c.

Referenced by decode_transform_coeffs_ch().

int ff_eac3_parse_header

(

AC3DecodeContext *

s

)

Parse the E-AC-3 frame header.

This parses both the bit stream info and audio frame header.

Definition at line 175 of file eac3dec.c.

Referenced by parse_frame_header().

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 54 of file eac3dec.c.

Referenced by ff_eac3_decode_transform_coeffs_aht_ch(), and ff_h264_idct8_add_altivec().