af_anequalizer.c File Reference

#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/ffmath.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"

Go to the source code of this file.

Data Structures
struct	FoSection
struct	EqualizatorFilter
struct	AudioNEqualizerContext

Macros
#define	FILTER_ORDER   4
#define	OFFSET(x)   offsetof(AudioNEqualizerContext, x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	V   AV_OPT_FLAG_VIDEO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM

Enumerations
enum	FilterType {   BUTTERWORTH, CHEBYSHEV1, CHEBYSHEV2, NB_TYPES,   biquad, equalizer, bass, treble,   band, bandpass, bandreject, allpass,   highpass, lowpass, LOWPASS, FLAT,   AFLAT, CHROMA, COLOR, ACOLOR,   NB_FILTERS }

Functions
	AVFILTER_DEFINE_CLASS (anequalizer)
static void	draw_curves (AVFilterContext *ctx, AVFilterLink *inlink, AVFrame *out)
static int	config_video (AVFilterLink *outlink)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)
static void	butterworth_fo_section (FoSection *S, double beta, double si, double g, double g0, double D, double c0)
static void	butterworth_bp_filter (EqualizatorFilter *f, int N, double w0, double wb, double G, double Gb, double G0)
static void	chebyshev1_fo_section (FoSection *S, double a, double c, double tetta_b, double g0, double si, double b, double D, double c0)
static void	chebyshev1_bp_filter (EqualizatorFilter *f, int N, double w0, double wb, double G, double Gb, double G0)
static void	chebyshev2_fo_section (FoSection *S, double a, double c, double tetta_b, double g, double si, double b, double D, double c0)
static void	chebyshev2_bp_filter (EqualizatorFilter *f, int N, double w0, double wb, double G, double Gb, double G0)
static double	butterworth_compute_bw_gain_db (double gain)
static double	chebyshev1_compute_bw_gain_db (double gain)
static double	chebyshev2_compute_bw_gain_db (double gain)
static double	hz_2_rad (double x, double fs)
static void	equalizer (EqualizatorFilter *f, double sample_rate)
static int	add_filter (AudioNEqualizerContext *s, AVFilterLink *inlink)
static int	config_input (AVFilterLink *inlink)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
static double	section_process (FoSection *S, double in)
static double	process_sample (FoSection *s1, double in)
static int	filter_frame (AVFilterLink *inlink, AVFrame *buf)

Variables
static const AVOption	anequalizer_options []
static const AVFilterPad	inputs []
AVFilter	ff_af_anequalizer

Macro Definition Documentation

#define FILTER_ORDER   4

Definition at line 31 of file af_anequalizer.c.

Referenced by draw_curves(), equalizer(), and process_sample().

#define OFFSET

(

x

)

offsetof(AudioNEqualizerContext, x)

Definition at line 75 of file af_anequalizer.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 76 of file af_anequalizer.c.

#define V   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 77 of file af_anequalizer.c.

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 78 of file af_anequalizer.c.

Enumeration Type Documentation

enum FilterType

Enumerator
BUTTERWORTH
CHEBYSHEV1
CHEBYSHEV2
NB_TYPES
biquad
equalizer
bass
treble
band
bandpass
bandreject
allpass
highpass
lowpass
LOWPASS
FLAT
AFLAT
CHROMA
COLOR
ACOLOR
NB_FILTERS

Definition at line 33 of file af_anequalizer.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

anequalizer

)

static void draw_curves ( AVFilterContext *  ctx, AVFilterLink *  inlink, AVFrame *  out  )

static

Definition at line 94 of file af_anequalizer.c.

Referenced by config_video(), and process_command().

static int config_video ( AVFilterLink *  outlink )

static

Definition at line 167 of file af_anequalizer.c.

Referenced by init().

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 188 of file af_anequalizer.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 219 of file af_anequalizer.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 258 of file af_anequalizer.c.

static void butterworth_fo_section ( FoSection *  S, double  beta, double  si, double  g, double  g0, double  D, double  c0  )

static

Definition at line 271 of file af_anequalizer.c.

Referenced by butterworth_bp_filter().

static void butterworth_bp_filter ( EqualizatorFilter *  f, int  N, double  w0, double  wb, double  G, double  Gb, double  G0  )

static

Definition at line 302 of file af_anequalizer.c.

Referenced by equalizer().

static void chebyshev1_fo_section ( FoSection *  S, double  a, double  c, double  tetta_b, double  g0, double  si, double  b, double  D, double  c0  )

static

Definition at line 339 of file af_anequalizer.c.

Referenced by chebyshev1_bp_filter().

static void chebyshev1_bp_filter ( EqualizatorFilter *  f, int  N, double  w0, double  wb, double  G, double  Gb, double  G0  )

static

Definition at line 371 of file af_anequalizer.c.

Referenced by equalizer().

static void chebyshev2_fo_section ( FoSection *  S, double  a, double  c, double  tetta_b, double  g, double  si, double  b, double  D, double  c0  )

static

Definition at line 412 of file af_anequalizer.c.

Referenced by chebyshev2_bp_filter().

static void chebyshev2_bp_filter ( EqualizatorFilter *  f, int  N, double  w0, double  wb, double  G, double  Gb, double  G0  )

static

Definition at line 444 of file af_anequalizer.c.

Referenced by equalizer().

static double butterworth_compute_bw_gain_db ( double  gain )

static

Definition at line 485 of file af_anequalizer.c.

Referenced by equalizer().

static double chebyshev1_compute_bw_gain_db ( double  gain )

static

Definition at line 499 of file af_anequalizer.c.

Referenced by equalizer().

static double chebyshev2_compute_bw_gain_db ( double  gain )

static

Definition at line 513 of file af_anequalizer.c.

Referenced by equalizer().

static double hz_2_rad ( double  x, double  fs  )

inlinestatic

Definition at line 527 of file af_anequalizer.c.

Referenced by equalizer().

static void equalizer ( EqualizatorFilter *  f, double  sample_rate  )

static

Definition at line 532 of file af_anequalizer.c.

Referenced by add_filter(), and process_command().

static int add_filter ( AudioNEqualizerContext *  s, AVFilterLink *  inlink  )

static

Definition at line 555 of file af_anequalizer.c.

Referenced by config_input().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 574 of file af_anequalizer.c.

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

static

Definition at line 632 of file af_anequalizer.c.

static double section_process ( FoSection *  S, double  in  )

inlinestatic

Definition at line 665 of file af_anequalizer.c.

Referenced by process_sample().

static double process_sample ( FoSection *  s1, double  in  )

static

Definition at line 688 of file af_anequalizer.c.

Referenced by filter_frame().

static int filter_frame ( AVFilterLink *  inlink, AVFrame *  buf  )

static

Definition at line 701 of file af_anequalizer.c.

Variable Documentation

const AVOption anequalizer_options[]

static

Initial value:

= {
    { "params", NULL,                             OFFSET(args),        AV_OPT_TYPE_STRING,     {.str=""}, 0, 0, A|F },
    { "curves", "draw frequency response curves", OFFSET(draw_curves), AV_OPT_TYPE_BOOL,       {.i64=0}, 0, 1, V|F },
    { "size",   "set video size",                 OFFSET(w),           AV_OPT_TYPE_IMAGE_SIZE, {.str = "hd720"}, 0, 0, V|F },
    { "mgain",  "set max gain",                   OFFSET(mag),         AV_OPT_TYPE_DOUBLE,     {.dbl=60}, -900, 900, V|F },
    { "fscale", "set frequency scale",            OFFSET(fscale),      AV_OPT_TYPE_INT,        {.i64=1}, 0, 1, V|F, "fscale" },
        { "lin",  "linear",                       0,                   AV_OPT_TYPE_CONST,      {.i64=0}, 0, 0, V|F, "fscale" },
        { "log",  "logarithmic",                  0,                   AV_OPT_TYPE_CONST,      {.i64=1}, 0, 0, V|F, "fscale" },
    { "colors", "set channels curves colors",     OFFSET(colors),      AV_OPT_TYPE_STRING,     {.str = "red|green|blue|yellow|orange|lime|pink|magenta|brown" }, 0, 0, V|F },
    { NULL }
}

Definition at line 80 of file af_anequalizer.c.

const AVFilterPad inputs[]

static

Initial value:

= {
    {
        .name           = "default",
        .type           = AVMEDIA_TYPE_AUDIO,
        .config_props   = config_input,
        .filter_frame   = filter_frame,
        .needs_writable = 1,
    },
    { NULL }
}

Definition at line 739 of file af_anequalizer.c.

AVFilter ff_af_anequalizer

Initial value:

= {
    .name          = "anequalizer",
    .description   = NULL_IF_CONFIG_SMALL("Apply high-order audio parametric multi band equalizer."),
    .priv_size     = sizeof(AudioNEqualizerContext),
    .priv_class    = &anequalizer_class,
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = inputs,
    .outputs       = NULL,
    .flags         = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
    .process_command = process_command,
}

Definition at line 750 of file af_anequalizer.c.