af_afftdn.c File Reference

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

Go to the source code of this file.

Data Structures
struct	DeNoiseChannel
struct	AudioFFTDeNoiseContext

Macros
#define	C   (M_LN10 * 0.1)
#define	SOLVE_SIZE   (5)
#define	NB_PROFILE_BANDS   (15)
#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	SampleNoiseModes { SAMPLE_NONE, SAMPLE_START, SAMPLE_STOP, NB_SAMPLEMODES }
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	NoiseLinkType {   NONE_LINK, MIN_LINK, MAX_LINK, AVERAGE_LINK,   NB_LINK }
enum	NoiseType {   WHITE_NOISE, VINYL_NOISE, SHELLAC_NOISE, CUSTOM_NOISE,   NB_NOISE }

Functions
	AVFILTER_DEFINE_CLASS (afftdn)
static double	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 double	process_get_band_noise (AudioFFTDeNoiseContext *s, DeNoiseChannel *dnch, int band)
static double	limit_gain (double a, double b)
static void	spectral_flatness (AudioFFTDeNoiseContext *s, const double *const spectral, double floor, int len, double *rnum, double *rden)
static void	set_parameters (AudioFFTDeNoiseContext *s, DeNoiseChannel *dnch, int update_var, int update_auto_var)
static double	floor_offset (const double *S, int size, double mean)
static void	process_frame (AVFilterContext *ctx, AudioFFTDeNoiseContext *s, DeNoiseChannel *dnch, 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	reduce_mean (double *band_noise)
static int	config_input (AVFilterLink *inlink)
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)
static int	filter_channel (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	output_frame (AVFilterLink *inlink, AVFrame *in)
static int	activate (AVFilterContext *ctx)
static av_cold void	uninit (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 []
const AVFilter	ff_af_afftdn

Macro Definition Documentation

C

#define C   (M_LN10 * 0.1)

Definition at line 32 of file af_afftdn.c.

SOLVE_SIZE

#define SOLVE_SIZE   (5)

Definition at line 33 of file af_afftdn.c.

NB_PROFILE_BANDS

#define NB_PROFILE_BANDS   (15)

Definition at line 34 of file af_afftdn.c.

OFFSET

#define OFFSET

(

x

)

offsetof(AudioFFTDeNoiseContext, x)

Definition at line 162 of file af_afftdn.c.

AF

#define AF   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 163 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 164 of file af_afftdn.c.

Enumeration Type Documentation

SampleNoiseModes

enum SampleNoiseModes

Enumerator
SAMPLE_NONE
SAMPLE_START
SAMPLE_STOP
NB_SAMPLEMODES

Definition at line 36 of file af_afftdn.c.

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 43 of file af_afftdn.c.

NoiseLinkType

enum NoiseLinkType

Enumerator
NONE_LINK
MIN_LINK
MAX_LINK
AVERAGE_LINK
NB_LINK

Definition at line 50 of file af_afftdn.c.

NoiseType

enum NoiseType

Enumerator
WHITE_NOISE
VINYL_NOISE
SHELLAC_NOISE
CUSTOM_NOISE
NB_NOISE

Definition at line 58 of file af_afftdn.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

afftdn

)

get_band_noise()

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

static

Definition at line 223 of file af_afftdn.c.

Referenced by config_input().

factor()

static void factor ( double *  array, int  size  )

static

Definition at line 239 of file af_afftdn.c.

Referenced by config_input().

solve()

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

static

Definition at line 253 of file af_afftdn.c.

Referenced by process_get_band_noise(), and set_noise_profile().

process_get_band_noise()

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

static

Definition at line 272 of file af_afftdn.c.

Referenced by set_band_parameters(), and set_parameters().

limit_gain()

static double limit_gain ( double  a, double  b  )

static

Definition at line 302 of file af_afftdn.c.

Referenced by process_frame().

spectral_flatness()

static void spectral_flatness ( AudioFFTDeNoiseContext *  s, const double *const  spectral, double  floor, int  len, double *  rnum, double *  rden  )

static

Definition at line 311 of file af_afftdn.c.

Referenced by process_frame().

set_parameters()

static void set_parameters ( AudioFFTDeNoiseContext *  s, DeNoiseChannel *  dnch, int  update_var, int  update_auto_var  )

static

Definition at line 575 of file af_afftdn.c.

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

floor_offset()

static double floor_offset ( const double *  S, int  size, double  mean  )

static

Definition at line 339 of file af_afftdn.c.

Referenced by process_frame().

process_frame()

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

static

Definition at line 352 of file af_afftdn.c.

Referenced by filter_channel().

freq2bark()

static double freq2bark ( double  x )

static

Definition at line 482 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 489 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 497 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 510 of file af_afftdn.c.

Referenced by set_parameters().

read_custom_noise()

static void read_custom_noise ( AudioFFTDeNoiseContext *  s, int  ch  )

static

Definition at line 540 of file af_afftdn.c.

Referenced by config_input().

reduce_mean()

static void reduce_mean ( double *  band_noise )

static

Definition at line 615 of file af_afftdn.c.

Referenced by config_input(), and set_noise_profile().

config_input()

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 627 of file af_afftdn.c.

init_sample_noise()

static void init_sample_noise ( DeNoiseChannel *  dnch )

static

Definition at line 894 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 904 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 987 of file af_afftdn.c.

Referenced by output_frame().

set_noise_profile()

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

static

Definition at line 1006 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 1043 of file af_afftdn.c.

Referenced by output_frame().

output_frame()

static int output_frame ( AVFilterLink *  inlink, AVFrame *  in  )

static

Definition at line 1101 of file af_afftdn.c.

Referenced by activate().

activate()

static int activate ( AVFilterContext *  ctx )

static

Definition at line 1263 of file af_afftdn.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 1290 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 1326 of file af_afftdn.c.

Variable Documentation

afftdn_options

const AVOption afftdn_options[]

static

Definition at line 166 of file af_afftdn.c.

inputs

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 1352 of file af_afftdn.c.

outputs

const AVFilterPad outputs[]

static

Initial value:

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

Definition at line 1360 of file af_afftdn.c.

ff_af_afftdn

const AVFilter ff_af_afftdn

Initial value:

= {
    .name            = "afftdn",
    .description     = NULL_IF_CONFIG_SMALL("Denoise audio samples using FFT."),
    .priv_size       = sizeof(AudioFFTDeNoiseContext),
    .priv_class      = &afftdn_class,
    .activate        = activate,
    .uninit          = uninit,
    FILTER_INPUTS(inputs),
    FILTER_OUTPUTS(outputs),
    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
    .process_command = process_command,
    .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
                       AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 1367 of file af_afftdn.c.