af_anequalizer.c File Reference

#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/ffmath.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "audio.h"
#include "video.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)
#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 }

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 (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
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_channels (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	filter_frame (AVFilterLink *inlink, AVFrame *buf)

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

Macro Definition Documentation

FILTER_ORDER

#define FILTER_ORDER   4

Definition at line 34 of file af_anequalizer.c.

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(AudioNEqualizerContext, x)

Definition at line 78 of file af_anequalizer.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 79 of file af_anequalizer.c.

V

#define V   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 80 of file af_anequalizer.c.

F

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 81 of file af_anequalizer.c.

Enumeration Type Documentation

FilterType

enum FilterType

Enumerator
BUTTERWORTH
CHEBYSHEV1
CHEBYSHEV2
NB_TYPES

Definition at line 36 of file af_anequalizer.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

anequalizer

)

draw_curves()

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

static

Definition at line 97 of file af_anequalizer.c.

Referenced by config_video(), and process_command().

config_video()

static int config_video ( AVFilterLink * outlink )

static

Definition at line 170 of file af_anequalizer.c.

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 191 of file af_anequalizer.c.

query_formats()

static int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 220 of file af_anequalizer.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 245 of file af_anequalizer.c.

butterworth_fo_section()

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

static

Definition at line 255 of file af_anequalizer.c.

Referenced by butterworth_bp_filter().

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 286 of file af_anequalizer.c.

Referenced by equalizer().

chebyshev1_fo_section()

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 323 of file af_anequalizer.c.

Referenced by chebyshev1_bp_filter().

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 355 of file af_anequalizer.c.

Referenced by equalizer().

chebyshev2_fo_section()

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 396 of file af_anequalizer.c.

Referenced by chebyshev2_bp_filter().

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 428 of file af_anequalizer.c.

Referenced by equalizer().

butterworth_compute_bw_gain_db()

static double butterworth_compute_bw_gain_db ( double gain )

static

Definition at line 469 of file af_anequalizer.c.

Referenced by equalizer().

chebyshev1_compute_bw_gain_db()

static double chebyshev1_compute_bw_gain_db ( double gain )

static

Definition at line 483 of file af_anequalizer.c.

Referenced by equalizer().

chebyshev2_compute_bw_gain_db()

static double chebyshev2_compute_bw_gain_db ( double gain )

static

Definition at line 497 of file af_anequalizer.c.

Referenced by equalizer().

hz_2_rad()

static double hz_2_rad ( double x, double fs )

inlinestatic

Definition at line 511 of file af_anequalizer.c.

Referenced by equalizer().

equalizer()

static void equalizer ( EqualizatorFilter * f, double sample_rate )

static

Definition at line 516 of file af_anequalizer.c.

add_filter()

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

static

Definition at line 539 of file af_anequalizer.c.

Referenced by config_input().

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 558 of file af_anequalizer.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 616 of file af_anequalizer.c.

section_process()

static double section_process ( FoSection * S, double in )

inlinestatic

Definition at line 649 of file af_anequalizer.c.

Referenced by process_sample().

process_sample()

static double process_sample ( FoSection * s1, double in )

static

Definition at line 672 of file af_anequalizer.c.

Referenced by filter_channels().

filter_channels()

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

static

Definition at line 685 of file af_anequalizer.c.

filter_frame()

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

static

Definition at line 715 of file af_anequalizer.c.

Variable Documentation

anequalizer_options

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, .unit = "fscale" },
        { "lin",  "linear",                       0,                   AV_OPT_TYPE_CONST,      {.i64=0}, 0, 0, V|F, .unit = "fscale" },
        { "log",  "logarithmic",                  0,                   AV_OPT_TYPE_CONST,      {.i64=1}, 0, 0, V|F, .unit = "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 83 of file af_anequalizer.c.

inputs

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 745 of file af_anequalizer.c.

ff_af_anequalizer

const FFFilter ff_af_anequalizer

Initial value:

= {
    .p.name        = "anequalizer",
    .p.description = NULL_IF_CONFIG_SMALL("Apply high-order audio parametric multi band equalizer."),
    .p.priv_class  = &anequalizer_class,
    .p.outputs     = NULL,
    .p.flags       = AVFILTER_FLAG_DYNAMIC_OUTPUTS |
                     AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
                     AVFILTER_FLAG_SLICE_THREADS,
    .priv_size     = sizeof(AudioNEqualizerContext),
    .init          = init,
    .uninit        = uninit,
    FILTER_INPUTS(inputs),
    FILTER_QUERY_FUNC2(query_formats),
    .process_command = process_command,
}

Definition at line 755 of file af_anequalizer.c.