libavcodec/ac3enc.h File Reference

AC-3 encoder & E-AC-3 encoder common header. More...

#include <stdint.h>
#include "ac3.h"
#include "ac3dsp.h"
#include "avcodec.h"
#include "dsputil.h"
#include "put_bits.h"
#include "fft.h"

Go to the source code of this file.

Data Structures
struct	AC3MDCTContext
struct	AC3EncOptions
	Encoding Options used by AVOption. More...
struct	AC3Block
	Data for a single audio block. More...
struct	AC3EncodeContext
	AC-3 encoder private context. More...
Defines
#define	OFFSET(param)   offsetof(AC3EncodeContext, options.param)
#define	AC3ENC_PARAM   (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)
#define	AC3ENC_TYPE_AC3_FIXED   0
#define	AC3ENC_TYPE_AC3   1
#define	AC3ENC_TYPE_EAC3   2
#define	AC3_NAME(x)   ff_ac3_fixed_ ## x
#define	MAC_COEF(d, a, b)   MAC64(d,a,b)
Typedefs
typedef int16_t	SampleType
typedef int32_t	CoefType
typedef int64_t	CoefSumType
typedef struct AC3MDCTContext	AC3MDCTContext
typedef struct AC3EncOptions	AC3EncOptions
	Encoding Options used by AVOption.
typedef struct AC3Block	AC3Block
	Data for a single audio block.
typedef struct AC3EncodeContext	AC3EncodeContext
	AC-3 encoder private context.
Functions
int	ff_ac3_encode_init (AVCodecContext *avctx)
	Initialize the encoder.
int	ff_ac3_encode_frame (AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data)
	Encode a single AC-3 frame.
int	ff_ac3_encode_close (AVCodecContext *avctx)
	Finalize encoding and free any memory allocated by the encoder.
void	ff_ac3_fixed_mdct_end (AC3MDCTContext *mdct)
void	ff_ac3_float_mdct_end (AC3MDCTContext *mdct)
	Finalize MDCT and free allocated memory.
int	ff_ac3_fixed_mdct_init (AVCodecContext *avctx, AC3MDCTContext *mdct, int nbits)
int	ff_ac3_float_mdct_init (AVCodecContext *avctx, AC3MDCTContext *mdct, int nbits)
	Initialize MDCT tables.
void	ff_ac3_fixed_apply_window (DSPContext *dsp, SampleType *output, const SampleType *input, const SampleType *window, unsigned int len)
void	ff_ac3_float_apply_window (DSPContext *dsp, SampleType *output, const SampleType *input, const SampleType *window, unsigned int len)
int	ff_ac3_fixed_normalize_samples (AC3EncodeContext *s)
void	ff_ac3_fixed_scale_coefficients (AC3EncodeContext *s)
void	ff_ac3_float_scale_coefficients (AC3EncodeContext *s)
	Scale MDCT coefficients from float to 24-bit fixed-point.
int	ff_ac3_fixed_allocate_sample_buffers (AC3EncodeContext *s)
int	ff_ac3_float_allocate_sample_buffers (AC3EncodeContext *s)
void	ff_ac3_fixed_deinterleave_input_samples (AC3EncodeContext *s, const SampleType *samples)
void	ff_ac3_float_deinterleave_input_samples (AC3EncodeContext *s, const SampleType *samples)
void	ff_ac3_fixed_apply_mdct (AC3EncodeContext *s)
void	ff_ac3_float_apply_mdct (AC3EncodeContext *s)
void	ff_ac3_fixed_apply_channel_coupling (AC3EncodeContext *s)
void	ff_ac3_float_apply_channel_coupling (AC3EncodeContext *s)
void	ff_ac3_fixed_compute_rematrixing_strategy (AC3EncodeContext *s)
void	ff_ac3_float_compute_rematrixing_strategy (AC3EncodeContext *s)
Variables
const int64_t	ff_ac3_channel_layouts [19]
	List of supported channel layouts.

---

Detailed Description

AC-3 encoder & E-AC-3 encoder common header.

Definition in file ac3enc.h.

---

Define Documentation

#define AC3_NAME

(

x

)

ff_ac3_fixed_ ## x

Definition at line 57 of file ac3enc.h.

#define AC3ENC_PARAM   (AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM)

Definition at line 44 of file ac3enc.h.

#define AC3ENC_TYPE_AC3   1

Definition at line 47 of file ac3enc.h.

#define AC3ENC_TYPE_AC3_FIXED   0

Definition at line 46 of file ac3enc.h.

#define AC3ENC_TYPE_EAC3   2

Definition at line 48 of file ac3enc.h.

#define MAC_COEF	(		d,
			a,
			b
	)		MAC64(d,a,b)

Definition at line 58 of file ac3enc.h.

Referenced by apply_channel_coupling(), and compute_rematrixing_strategy().

#define OFFSET

(

param

)

offsetof(AC3EncodeContext, options.param)

Definition at line 43 of file ac3enc.h.

---

Typedef Documentation

typedef struct AC3Block AC3Block

Data for a single audio block.

typedef struct AC3EncodeContext AC3EncodeContext

AC-3 encoder private context.

typedef struct AC3EncOptions AC3EncOptions

Encoding Options used by AVOption.

typedef struct AC3MDCTContext AC3MDCTContext

typedef int64_t CoefSumType

Definition at line 61 of file ac3enc.h.

typedef int32_t CoefType

Definition at line 60 of file ac3enc.h.

typedef int16_t SampleType

Definition at line 59 of file ac3enc.h.

---

Function Documentation

int ff_ac3_encode_close

(

AVCodecContext *

avctx

)

Finalize encoding and free any memory allocated by the encoder.

Definition at line 1932 of file ac3enc.c.

Referenced by ff_ac3_encode_init().

int ff_ac3_encode_frame	(	AVCodecContext *	avctx,
		unsigned char *	frame,
		int	buf_size,
		void *	data
	)

Encode a single AC-3 frame.

Definition at line 1881 of file ac3enc.c.

int ff_ac3_encode_init

(

AVCodecContext *

avctx

)

Initialize the encoder.

Definition at line 2315 of file ac3enc.c.

Referenced by ac3_fixed_encode_init().

int ff_ac3_fixed_allocate_sample_buffers

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_fixed_apply_channel_coupling

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_fixed_apply_mdct

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_fixed_apply_window	(	DSPContext *	dsp,
		SampleType *	output,
		const SampleType *	input,
		const SampleType *	window,
		unsigned int	len
	)

Referenced by ff_ac3_encode_init().

void ff_ac3_fixed_compute_rematrixing_strategy

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_fixed_deinterleave_input_samples	(	AC3EncodeContext *	s,
		const SampleType *	samples
	)

Referenced by ff_ac3_encode_init().

void ff_ac3_fixed_mdct_end

(

AC3MDCTContext *

mdct

)

Referenced by ff_ac3_encode_init().

int ff_ac3_fixed_mdct_init	(	AVCodecContext *	avctx,
		AC3MDCTContext *	mdct,
		int	nbits
	)

Referenced by ff_ac3_encode_init().

int ff_ac3_fixed_normalize_samples

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_fixed_scale_coefficients

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

int ff_ac3_float_allocate_sample_buffers

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_float_apply_channel_coupling

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_float_apply_mdct

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_float_apply_window	(	DSPContext *	dsp,
		SampleType *	output,
		const SampleType *	input,
		const SampleType *	window,
		unsigned int	len
	)

Referenced by ff_ac3_encode_init().

void ff_ac3_float_compute_rematrixing_strategy

(

AC3EncodeContext *

s

)

Referenced by ff_ac3_encode_init().

void ff_ac3_float_deinterleave_input_samples	(	AC3EncodeContext *	s,
		const SampleType *	samples
	)

Referenced by ff_ac3_encode_init().

void ff_ac3_float_mdct_end

(

AC3MDCTContext *

mdct

)

Finalize MDCT and free allocated memory.

Definition at line 48 of file ac3enc_float.c.

Referenced by ff_ac3_encode_init().

int ff_ac3_float_mdct_init	(	AVCodecContext *	avctx,
		AC3MDCTContext *	mdct,
		int	nbits
	)

Initialize MDCT tables.

Parameters:

nbits

log2(MDCT size)

Definition at line 59 of file ac3enc_float.c.

Referenced by ff_ac3_encode_init().

void ff_ac3_float_scale_coefficients

(

AC3EncodeContext *

s

)

Scale MDCT coefficients from float to 24-bit fixed-point.

Definition at line 96 of file ac3enc_float.c.

Referenced by ff_ac3_encode_init().

---

Variable Documentation

const int64_t ff_ac3_channel_layouts[19]

List of supported channel layouts.

Definition at line 80 of file ac3enc.c.