af_afftdn.c File Reference

#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"

Go to the source code of this file.

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	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Enumerations
enum	OutModes { IN_MODE, OUT_MODE, NOISE_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

#define C   (M_LN10 * 0.1)

Definition at line 33 of file af_afftdn.c.

Referenced by finish_sample_noise(), get_auto_noise_levels(), set_band_parameters(), and set_parameters().

#define RATIO   0.98

Definition at line 34 of file af_afftdn.c.

Referenced by process_frame().

#define RRATIO   (1.0 - RATIO)

Definition at line 35 of file af_afftdn.c.

Referenced by config_input(), and process_frame().

#define OFFSET

(

x

)

offsetof(AudioFFTDeNoiseContext, x)

Definition at line 143 of file af_afftdn.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 144 of file af_afftdn.c.

Enumeration Type Documentation

enum OutModes

Enumerator
IN_MODE
OUT_MODE
NOISE_MODE
NB_MODES

Definition at line 37 of file af_afftdn.c.

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

(

afftdn

)

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

static

Definition at line 167 of file af_afftdn.c.

Referenced by config_input().

static void factor ( double *  array, int  size  )

static

Definition at line 183 of file af_afftdn.c.

Referenced by config_input().

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

static

Definition at line 197 of file af_afftdn.c.

Referenced by process_get_band_noise(), and set_noise_profile().

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

static

Definition at line 216 of file af_afftdn.c.

Referenced by set_band_parameters().

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

static

Definition at line 246 of file af_afftdn.c.

Referenced by process_frame().

static double limit_gain ( double  a, double  b  )

static

Definition at line 282 of file af_afftdn.c.

Referenced by 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 291 of file af_afftdn.c.

Referenced by filter_channel().

static double freq2bark ( double  x )

static

Definition at line 484 of file af_afftdn.c.

Referenced by config_input().

static int get_band_centre ( AudioFFTDeNoiseContext *  s, int  band  )

static

Definition at line 491 of file af_afftdn.c.

Referenced by set_band_parameters().

static int get_band_edge ( AudioFFTDeNoiseContext *  s, int  band  )

static

Definition at line 499 of file af_afftdn.c.

Referenced by config_input().

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

static

Definition at line 512 of file af_afftdn.c.

Referenced by output_frame(), and set_parameters().

static void read_custom_noise ( AudioFFTDeNoiseContext *  s, int  ch  )

static

Definition at line 548 of file af_afftdn.c.

Referenced by config_input().

static void set_parameters ( AudioFFTDeNoiseContext *  s )

static

Definition at line 580 of file af_afftdn.c.

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

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 609 of file af_afftdn.c.

static void preprocess ( FFTComplex *  in, int  len  )

static

Definition at line 857 of file af_afftdn.c.

Referenced by filter_channel(), and sample_noise_block().

static void postprocess ( FFTComplex *  in, int  len  )

static

Definition at line 890 of file af_afftdn.c.

Referenced by filter_channel().

static void init_sample_noise ( DeNoiseChannel *  dnch )

static

Definition at line 921 of file af_afftdn.c.

Referenced by output_frame().

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

static

Definition at line 931 of file af_afftdn.c.

Referenced by output_frame().

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

static

Definition at line 999 of file af_afftdn.c.

Referenced by output_frame().

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

static

Definition at line 1018 of file af_afftdn.c.

Referenced by output_frame().

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

static

Definition at line 1085 of file af_afftdn.c.

Referenced by output_frame().

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

static

Definition at line 1138 of file af_afftdn.c.

Referenced by output_frame().

static int output_frame ( AVFilterLink *  inlink )

static

Definition at line 1157 of file af_afftdn.c.

Referenced by activate().

static int activate ( AVFilterContext *  ctx )

static

Definition at line 1270 of file af_afftdn.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 1307 of file af_afftdn.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 1344 of file af_afftdn.c.

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

static

Definition at line 1373 of file af_afftdn.c.

Variable Documentation

const AVOption afftdn_options[]

static

Initial value:

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

Definition at line 146 of file af_afftdn.c.

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 1422 of file af_afftdn.c.

const AVFilterPad outputs[]

static

Initial value:

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

Definition at line 1431 of file af_afftdn.c.

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 1439 of file af_afftdn.c.