#include <float.h>
#include "libavutil/audio_fifo.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavcodec/avfft.h"
#include "avfilter.h"
#include "audio.h"
#include "formats.h"
#include "filters.h"

Data Structures
struct	DeNoiseChannel

struct	AudioFFTDeNoiseContext

struct	ThreadData
	Used for passing data between threads. More...

Macros
#define	C (M_LN10 * 0.1)

#define	RATIO 0.98

#define	RRATIO (1.0 - RATIO)

#define	OFFSET(x) offsetof(AudioFFTDeNoiseContext, x)

#define	AF AV_OPT_FLAG_AUDIO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM

#define	AFR AV_OPT_FLAG_AUDIO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_RUNTIME_PARAM

Enumerations
enum	OutModes { IN_MODE , OUT_MODE , NOISE_MODE , NB_MODES , IN_MODE , OUT_MODE , NOISE_MODE , NB_MODES , IN_MODE , DESIRED_MODE , OUT_MODE , NOISE_MODE , NB_OMODES , IN_MODE , OUT_MODE , ESS_MODE , NB_MODES }

enum	NoiseType { WHITE_NOISE , VINYL_NOISE , SHELLAC_NOISE , CUSTOM_NOISE , NB_NOISE }

Functions
	AVFILTER_DEFINE_CLASS (afftdn)

static int	get_band_noise (AudioFFTDeNoiseContext *s, int band, double a, double b, double c)

static void	factor (double *array, int size)

static void	solve (double matrix, double vector, int size)

static int	process_get_band_noise (AudioFFTDeNoiseContext s, DeNoiseChannel dnch, int band)

static void	calculate_sfm (AudioFFTDeNoiseContext s, DeNoiseChannel dnch, int start, int end)

static double	limit_gain (double a, double b)

static void	process_frame (AudioFFTDeNoiseContext s, DeNoiseChannel dnch, FFTComplex fft_data, double prior, double *prior_band_excit, int track_noise)

static double	freq2bark (double x)

static int	get_band_centre (AudioFFTDeNoiseContext *s, int band)

static int	get_band_edge (AudioFFTDeNoiseContext *s, int band)

static void	set_band_parameters (AudioFFTDeNoiseContext s, DeNoiseChannel dnch)

static void	read_custom_noise (AudioFFTDeNoiseContext *s, int ch)

static void	set_parameters (AudioFFTDeNoiseContext *s)

static int	config_input (AVFilterLink *inlink)

static void	preprocess (FFTComplex *in, int len)

static void	postprocess (FFTComplex *in, int len)

static void	init_sample_noise (DeNoiseChannel *dnch)

static void	sample_noise_block (AudioFFTDeNoiseContext s, DeNoiseChannel dnch, AVFrame *in, int ch)

static void	finish_sample_noise (AudioFFTDeNoiseContext s, DeNoiseChannel dnch, double *sample_noise)

static void	set_noise_profile (AudioFFTDeNoiseContext s, DeNoiseChannel dnch, double *sample_noise, int new_profile)

static int	filter_channel (AVFilterContext ctx, void arg, int jobnr, int nb_jobs)

static void	get_auto_noise_levels (AudioFFTDeNoiseContext s, DeNoiseChannel dnch, double *levels)

static int	output_frame (AVFilterLink *inlink)

static int	activate (AVFilterContext *ctx)

static av_cold void	uninit (AVFilterContext *ctx)

static int	query_formats (AVFilterContext *ctx)

static int	process_command (AVFilterContext ctx, const char cmd, const char args, char res, int res_len, int flags)

Variables
static const AVOption	afftdn_options []

static const AVFilterPad	inputs []

static const AVFilterPad	outputs []

AVFilter	ff_af_afftdn

Macro Definition Documentation

◆ C

#define C (M_LN10 * 0.1)

Definition at line 33 of file af_afftdn.c.

◆ RATIO

#define RATIO 0.98

Definition at line 34 of file af_afftdn.c.

◆ RRATIO

#define RRATIO (1.0 - RATIO)

Definition at line 35 of file af_afftdn.c.

◆ OFFSET

#define OFFSET ( x ) offsetof(AudioFFTDeNoiseContext, x)

Definition at line 143 of file af_afftdn.c.

◆ AF

#define AF AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 144 of file af_afftdn.c.

◆ AFR

#define AFR AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 145 of file af_afftdn.c.

Enumeration Type Documentation

◆ OutModes

enum OutModes

Enumerator
IN_MODE
OUT_MODE
NOISE_MODE
NB_MODES
IN_MODE
OUT_MODE
NOISE_MODE
NB_MODES
IN_MODE
DESIRED_MODE
OUT_MODE
NOISE_MODE
NB_OMODES
IN_MODE
OUT_MODE
ESS_MODE
NB_MODES

Definition at line 37 of file af_afftdn.c.

◆ NoiseType

enum NoiseType

Enumerator
WHITE_NOISE
VINYL_NOISE
SHELLAC_NOISE
CUSTOM_NOISE
NB_NOISE

Definition at line 44 of file af_afftdn.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( afftdn )

◆ get_band_noise()

static int get_band_noise	(	AudioFFTDeNoiseContext *	s,
		int	band,
		double	a,
		double	b,
		double	c
	)

static

Definition at line 168 of file af_afftdn.c.

Referenced by config_input().

◆ factor()

static void factor	(	double *	array,
		int	size
	)

static

Definition at line 184 of file af_afftdn.c.

Referenced by config_input().

◆ solve()

static void solve	(	double *	matrix,
		double *	vector,
		int	size
	)

static

Definition at line 198 of file af_afftdn.c.

Referenced by process_get_band_noise(), and set_noise_profile().

◆ process_get_band_noise()

static int process_get_band_noise	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch,
		int	band
	)

static

Definition at line 217 of file af_afftdn.c.

Referenced by set_band_parameters().

◆ calculate_sfm()

static void calculate_sfm	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch,
		int	start,
		int	end
	)

static

Definition at line 247 of file af_afftdn.c.

Referenced by process_frame().

◆ limit_gain()

static double limit_gain	(	double	a,
		double	b
	)

static

Definition at line 283 of file af_afftdn.c.

Referenced by process_frame().

◆ process_frame()

static void process_frame	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch,
		FFTComplex *	fft_data,
		double *	prior,
		double *	prior_band_excit,
		int	track_noise
	)

static

Definition at line 292 of file af_afftdn.c.

Referenced by filter_channel().

◆ freq2bark()

static double freq2bark ( double x )

static

Definition at line 485 of file af_afftdn.c.

Referenced by config_input().

◆ get_band_centre()

static int get_band_centre	(	AudioFFTDeNoiseContext *	s,
		int	band
	)

static

Definition at line 492 of file af_afftdn.c.

Referenced by set_band_parameters().

◆ get_band_edge()

static int get_band_edge	(	AudioFFTDeNoiseContext *	s,
		int	band
	)

static

Definition at line 500 of file af_afftdn.c.

Referenced by config_input().

◆ set_band_parameters()

static void set_band_parameters	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch
	)

static

Definition at line 513 of file af_afftdn.c.

Referenced by output_frame(), and set_parameters().

◆ read_custom_noise()

static void read_custom_noise	(	AudioFFTDeNoiseContext *	s,
		int	ch
	)

static

Definition at line 549 of file af_afftdn.c.

Referenced by config_input().

◆ set_parameters()

static void set_parameters ( AudioFFTDeNoiseContext * s )

static

Definition at line 581 of file af_afftdn.c.

Referenced by config_input(), output_frame(), and process_command().

◆ config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 610 of file af_afftdn.c.

◆ preprocess()

static void preprocess	(	FFTComplex *	in,
		int	len
	)

static

Definition at line 858 of file af_afftdn.c.

Referenced by filter_channel(), and sample_noise_block().

◆ postprocess()

static void postprocess	(	FFTComplex *	in,
		int	len
	)

static

Definition at line 891 of file af_afftdn.c.

Referenced by filter_channel().

◆ init_sample_noise()

static void init_sample_noise ( DeNoiseChannel * dnch )

static

Definition at line 922 of file af_afftdn.c.

Referenced by output_frame().

◆ sample_noise_block()

static void sample_noise_block	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch,
		AVFrame *	in,
		int	ch
	)

static

Definition at line 932 of file af_afftdn.c.

Referenced by output_frame().

◆ finish_sample_noise()

static void finish_sample_noise	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch,
		double *	sample_noise
	)

static

Definition at line 1000 of file af_afftdn.c.

Referenced by output_frame().

◆ set_noise_profile()

static void set_noise_profile	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch,
		double *	sample_noise,
		int	new_profile
	)

static

Definition at line 1019 of file af_afftdn.c.

Referenced by output_frame().

◆ filter_channel()

static int filter_channel	(	AVFilterContext *	ctx,
		void *	arg,
		int	jobnr,
		int	nb_jobs
	)

static

Definition at line 1086 of file af_afftdn.c.

Referenced by output_frame().

◆ get_auto_noise_levels()

static void get_auto_noise_levels	(	AudioFFTDeNoiseContext *	s,
		DeNoiseChannel *	dnch,
		double *	levels
	)

static

Definition at line 1139 of file af_afftdn.c.

Referenced by output_frame().

◆ output_frame()

static int output_frame ( AVFilterLink * inlink )

static

Definition at line 1158 of file af_afftdn.c.

Referenced by activate().

◆ activate()

static int activate ( AVFilterContext * ctx )

static

Definition at line 1271 of file af_afftdn.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 1308 of file af_afftdn.c.

◆ query_formats()

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 1345 of file af_afftdn.c.

◆ process_command()

static int process_command	(	AVFilterContext *	ctx,
		const char *	cmd,
		const char *	args,
		char *	res,
		int	res_len,
		int	flags
	)

static

Definition at line 1374 of file af_afftdn.c.

Variable Documentation

◆ afftdn_options

const AVOption afftdn_options[]

static

Initial value:

= {
    { "nr", "set the noise reduction",    OFFSET(noise_reduction), AV_OPT_TYPE_FLOAT,  {.dbl = 12},          .01, 97, AFR },
    { "nf", "set the noise floor",        OFFSET(noise_floor),     AV_OPT_TYPE_FLOAT,  {.dbl =-50},          -80,-20, AFR },
    { "nt", "set the noise type",         OFFSET(noise_type),      AV_OPT_TYPE_INT,    {.i64 = WHITE_NOISE}, WHITE_NOISE, NB_NOISE-1, AF, "type" },
    {  "w", "white noise",                0,                       AV_OPT_TYPE_CONST,  {.i64 = WHITE_NOISE},   0,  0, AF, "type" },
    {  "v", "vinyl noise",                0,                       AV_OPT_TYPE_CONST,  {.i64 = VINYL_NOISE},   0,  0, AF, "type" },
    {  "s", "shellac noise",              0,                       AV_OPT_TYPE_CONST,  {.i64 = SHELLAC_NOISE}, 0,  0, AF, "type" },
    {  "c", "custom noise",               0,                       AV_OPT_TYPE_CONST,  {.i64 = CUSTOM_NOISE},  0,  0, AF, "type" },
    { "bn", "set the custom bands noise", OFFSET(band_noise_str),  AV_OPT_TYPE_STRING, {.str = 0},             0,  0, AF },
    { "rf", "set the residual floor",     OFFSET(residual_floor),  AV_OPT_TYPE_FLOAT,  {.dbl =-38},          -80,-20, AFR },
    { "tn", "track noise",                OFFSET(track_noise),     AV_OPT_TYPE_BOOL,   {.i64 =  0},            0,  1, AFR },
    { "tr", "track residual",             OFFSET(track_residual),  AV_OPT_TYPE_BOOL,   {.i64 =  0},            0,  1, AFR },
    { "om", "set output mode",            OFFSET(output_mode),     AV_OPT_TYPE_INT,    {.i64 = OUT_MODE},      0,  NB_MODES-1, AFR, "mode" },
    {  "i", "input",                      0,                       AV_OPT_TYPE_CONST,  {.i64 = IN_MODE},       0,  0, AFR, "mode" },
    {  "o", "output",                     0,                       AV_OPT_TYPE_CONST,  {.i64 = OUT_MODE},      0,  0, AFR, "mode" },
    {  "n", "noise",                      0,                       AV_OPT_TYPE_CONST,  {.i64 = NOISE_MODE},    0,  0, AFR, "mode" },
    { NULL }
}

Definition at line 147 of file af_afftdn.c.

◆ inputs

const AVFilterPad inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .config_props = config_input,
    },
    { NULL }
}

Definition at line 1404 of file af_afftdn.c.

◆ outputs

const AVFilterPad outputs[]

static

Initial value:

= {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_AUDIO,
    },
    { NULL }
}

Definition at line 1413 of file af_afftdn.c.

◆ ff_af_afftdn

AVFilter ff_af_afftdn

Initial value:

= {
    .name            = "afftdn",
    .description     = NULL_IF_CONFIG_SMALL("Denoise audio samples using FFT."),
    .query_formats   = query_formats,
    .priv_size       = sizeof(AudioFFTDeNoiseContext),
    .priv_class      = &afftdn_class,
    .activate        = activate,
    .uninit          = uninit,
    .inputs          = inputs,
    .outputs         = outputs,
    .process_command = process_command,
    .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
                       AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 1421 of file af_afftdn.c.

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ C

◆ RATIO

◆ RRATIO

◆ OFFSET

◆ AF

◆ AFR

Enumeration Type Documentation

◆ OutModes

◆ NoiseType

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ get_band_noise()

◆ factor()

◆ solve()

◆ process_get_band_noise()

◆ calculate_sfm()

◆ limit_gain()

◆ process_frame()

◆ freq2bark()

◆ get_band_centre()

◆ get_band_edge()

◆ set_band_parameters()

◆ read_custom_noise()

◆ set_parameters()

◆ config_input()

◆ preprocess()

◆ postprocess()

◆ init_sample_noise()

◆ sample_noise_block()

◆ finish_sample_noise()

◆ set_noise_profile()

◆ filter_channel()

◆ get_auto_noise_levels()

◆ output_frame()

◆ activate()

◆ uninit()

◆ query_formats()

◆ process_command()

Variable Documentation

◆ afftdn_options

◆ inputs

◆ outputs

◆ ff_af_afftdn