#include <algorithm>
#include <cmath>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <vector>
#include "MDFEchoCancellationConfig.h"
#include "AudioTools/AudioLibs/AudioFFT.h"

Classes
struct	echo_float_t

struct	EchoState_
	Internal echo canceller state structure. More...

struct	fft_state< Allocator >
	FFT state management structure with custom allocator support. More...

class	MDFEchoCancellation< Allocator >
	Acoustic echo canceller using MDF algorithm. More...

Namespaces
namespace	audio_tools
	Generic Implementation of sound input and output for desktop environments using portaudio.

Macros
#define	ABS(x) (((x) < 0) ? (-(x)) : (x))

#define	ABS16(x) (((x) < 0) ? (-(x)) : (x))

#define	ABS32(x) (((x) < 0) ? (-(x)) : (x))

#define	ECHO_GET_FRAME_SIZE 3

#define	ECHO_GET_IMPULSE_RESPONSE 29

#define	ECHO_GET_IMPULSE_RESPONSE_SIZE 27

#define	ECHO_GET_SAMPLING_RATE 25

#define	ECHO_SET_SAMPLING_RATE 24

#define	FLOAT_ADD(a, b) (echo_float_add(a, b))

#define	FLOAT_DIVU(a, b) (echo_float_divu(a, b))

#define	FLOAT_EXTRACT16(a) (echo_float_extract16(a))

#define	FLOAT_GT(a, b) (echo_float_gt(a, b))

#define	FLOAT_LT(a, b) (echo_float_lt(a, b))

#define	FLOAT_MUL32U(a, b) (echo_float_mul32_u(a, b))

#define	FLOAT_MULT(a, b) (echo_float_mult(a, b))

#define	FLOAT_SHL(a, b) (echo_float_shl(a, b))

#define	FLOAT_SQRT(a) (echo_float_sqrt(a))

#define	FLOAT_SUB(a, b) (echo_float_sub(a, b))

#define	MAX16(a, b) ((a) > (b) ? (a) : (b))

#define	MAX32(a, b) ((a) > (b) ? (a) : (b))

#define	MIN16(a, b) ((a) < (b) ? (a) : (b))

#define	MIN32(a, b) ((a) < (b) ? (a) : (b))

#define	PSEUDOFLOAT(x) (echo_float_from_double(x))

#define	TOP16(x) (x)

#define	WEIGHT_SHIFT 0

#define	WORD2INT(x)

Functions
template<typename Allocator = std::allocator<uint8_t>>
void	echo_fft (void table, echo_word16_t in, echo_word16_t *out)
	Perform forward FFT.

template<typename Allocator = std::allocator<uint8_t>>
void	echo_fft_destroy (void *table)
	Destroy FFT state and release resources.

template<typename Allocator >
void *	echo_fft_init (int size, AudioFFTBase *driver, const Allocator &alloc)
	Initialize FFT state.

echo_float_t	echo_float_add (echo_float_t a, echo_float_t b)

echo_float_t	echo_float_divu (echo_float_t a, echo_float_t b)

int16_t	echo_float_extract16 (echo_float_t x)

echo_float_t	echo_float_from_double (double x)

bool	echo_float_gt (echo_float_t a, echo_float_t b)

bool	echo_float_lt (echo_float_t a, echo_float_t b)

echo_float_t	echo_float_mul32_u (float a, float b)

echo_float_t	echo_float_mult (echo_float_t a, echo_float_t b)

echo_float_t	echo_float_shl (echo_float_t x, int bits)

echo_float_t	echo_float_sqrt (echo_float_t x)

echo_float_t	echo_float_sub (echo_float_t a, echo_float_t b)

template<typename Allocator = std::allocator<uint8_t>>
void	echo_ifft (void table, echo_word16_t in, echo_word16_t *out)
	Perform inverse FFT.

Variables
static const echo_float_t	MIN_LEAK = {164, -15}

static const echo_float_t	VAR1_SMOOTH = {11796, -15}

static const echo_float_t	VAR1_UPDATE = {16384, -15}

static const echo_float_t	VAR2_SMOOTH = {23674, -15}

static const echo_float_t	VAR2_UPDATE = {8192, -15}

static const echo_float_t	VAR_BACKTRACK = {16384, 2}

Macro Definition Documentation

◆ ABS

#define ABS ( x ) (((x) < 0) ? (-(x)) : (x))

◆ ABS16

#define ABS16 ( x ) (((x) < 0) ? (-(x)) : (x))

◆ ABS32

#define ABS32 ( x ) (((x) < 0) ? (-(x)) : (x))

◆ ECHO_GET_FRAME_SIZE

#define ECHO_GET_FRAME_SIZE 3

◆ ECHO_GET_IMPULSE_RESPONSE

#define ECHO_GET_IMPULSE_RESPONSE 29

◆ ECHO_GET_IMPULSE_RESPONSE_SIZE

#define ECHO_GET_IMPULSE_RESPONSE_SIZE 27

◆ ECHO_GET_SAMPLING_RATE

#define ECHO_GET_SAMPLING_RATE 25

◆ ECHO_SET_SAMPLING_RATE

#define ECHO_SET_SAMPLING_RATE 24

◆ FLOAT_ADD

#define FLOAT_ADD	(	a,
		b
	)	(echo_float_add(a, b))

◆ FLOAT_DIVU

#define FLOAT_DIVU	(	a,
		b
	)	(echo_float_divu(a, b))

◆ FLOAT_EXTRACT16

#define FLOAT_EXTRACT16 ( a ) (echo_float_extract16(a))

◆ FLOAT_GT

#define FLOAT_GT	(	a,
		b
	)	(echo_float_gt(a, b))

◆ FLOAT_LT

#define FLOAT_LT	(	a,
		b
	)	(echo_float_lt(a, b))

◆ FLOAT_MUL32U

#define FLOAT_MUL32U	(	a,
		b
	)	(echo_float_mul32_u(a, b))

◆ FLOAT_MULT

#define FLOAT_MULT	(	a,
		b
	)	(echo_float_mult(a, b))

◆ FLOAT_SHL

#define FLOAT_SHL	(	a,
		b
	)	(echo_float_shl(a, b))

◆ FLOAT_SQRT

#define FLOAT_SQRT ( a ) (echo_float_sqrt(a))

◆ FLOAT_SUB

#define FLOAT_SUB	(	a,
		b
	)	(echo_float_sub(a, b))

◆ MAX16

#define MAX16	(	a,
		b
	)	((a) > (b) ? (a) : (b))

◆ MAX32

#define MAX32	(	a,
		b
	)	((a) > (b) ? (a) : (b))

◆ MIN16

#define MIN16	(	a,
		b
	)	((a) < (b) ? (a) : (b))

◆ MIN32

#define MIN32	(	a,
		b
	)	((a) < (b) ? (a) : (b))

◆ PSEUDOFLOAT

#define PSEUDOFLOAT ( x ) (echo_float_from_double(x))

◆ TOP16

#define TOP16 ( x ) (x)

◆ WEIGHT_SHIFT

#define WEIGHT_SHIFT 0

◆ WORD2INT

#define WORD2INT ( x )

Value:

  ((x) < -32767.5f  \
       ? -32768     \
       : ((x) > 32766.5f ? 32767 : (echo_int16_t)floorf(.5f + (x))))

Typedefs
typedef struct audio_tools::echo_float_t	echo_float_t

typedef int16_t	echo_int16_t

typedef int32_t	echo_int32_t

typedef echo_word32_t	echo_mem_t

typedef uint16_t	echo_uint16_t

typedef uint32_t	echo_uint32_t

typedef echo_int16_t	echo_word16_t

typedef echo_int32_t	echo_word32_t

typedef struct EchoState_	EchoState

Classes

Namespaces

Macros

Typedefs

Functions

Variables