af_acrossover.c File Reference

#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/float_dsp.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	BiquadCoeffs
struct	AudioCrossoverContext

Macros
#define	MAX_SPLITS   16
#define	MAX_BANDS   MAX_SPLITS + 1
#define	B0   0
#define	B1   1
#define	B2   2
#define	A1   3
#define	A2   4
#define	OFFSET(x)   offsetof(AudioCrossoverContext, x)
#define	AF   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
#define	BIQUAD_PROCESS(name, type)
#define	XOVER_PROCESS(name, type, one, ff)

Functions
	AVFILTER_DEFINE_CLASS (acrossover)
static int	parse_gains (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx)
static void	set_lp (BiquadCoeffs *b, double fc, double q, double sr)
static void	set_hp (BiquadCoeffs *b, double fc, double q, double sr)
static void	set_ap (BiquadCoeffs *b, double fc, double q, double sr)
static void	set_ap1 (BiquadCoeffs *b, double fc, double sr)
static void	calc_q_factors (int order, double *q)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	acrossover_options []
static const AVFilterPad	inputs []
const AVFilter	ff_af_acrossover

Detailed Description

Crossover filter

Split an audio stream into several bands.

Definition in file af_acrossover.c.

Macro Definition Documentation

MAX_SPLITS

#define MAX_SPLITS   16

Definition at line 39 of file af_acrossover.c.

MAX_BANDS

#define MAX_BANDS   MAX_SPLITS + 1

Definition at line 40 of file af_acrossover.c.

B0

#define B0   0

Definition at line 42 of file af_acrossover.c.

B1

#define B1   1

Definition at line 43 of file af_acrossover.c.

B2

#define B2   2

Definition at line 44 of file af_acrossover.c.

A1

#define A1   3

Definition at line 45 of file af_acrossover.c.

A2

#define A2   4

Definition at line 46 of file af_acrossover.c.

OFFSET

#define OFFSET

(

x

)

offsetof(AudioCrossoverContext, x)

Definition at line 84 of file af_acrossover.c.

AF

#define AF   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM

Definition at line 85 of file af_acrossover.c.

BIQUAD_PROCESS

#define BIQUAD_PROCESS	(		name,
			type
	)

Definition at line 304 of file af_acrossover.c.

XOVER_PROCESS

#define XOVER_PROCESS	(		name,
			type,
			one,
			ff
	)

Definition at line 353 of file af_acrossover.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

acrossover

)

parse_gains()

static int parse_gains ( AVFilterContext *  ctx )

static

Definition at line 107 of file af_acrossover.c.

Referenced by init().

init()

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 142 of file af_acrossover.c.

set_lp()

static void set_lp ( BiquadCoeffs *  b, double  fc, double  q, double  sr  )

static

Definition at line 201 of file af_acrossover.c.

Referenced by config_input().

set_hp()

static void set_hp ( BiquadCoeffs *  b, double  fc, double  q, double  sr  )

static

Definition at line 227 of file af_acrossover.c.

Referenced by config_input().

set_ap()

static void set_ap ( BiquadCoeffs *  b, double  fc, double  q, double  sr  )

static

Definition at line 253 of file af_acrossover.c.

Referenced by config_input().

set_ap1()

static void set_ap1 ( BiquadCoeffs *  b, double  fc, double  sr  )

static

Definition at line 279 of file af_acrossover.c.

Referenced by config_input().

calc_q_factors()

static void calc_q_factors ( int  order, double *  q  )

static

Definition at line 296 of file af_acrossover.c.

Referenced by config_input().

config_input()

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 428 of file af_acrossover.c.

filter_frame()

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

static

Definition at line 478 of file af_acrossover.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 519 of file af_acrossover.c.

Variable Documentation

acrossover_options

const AVOption acrossover_options[]

static

Initial value:

= {
    { "split", "set split frequencies", OFFSET(splits_str), AV_OPT_TYPE_STRING, {.str="500"}, 0, 0, AF },
    { "order", "set filter order",      OFFSET(order_opt),  AV_OPT_TYPE_INT,    {.i64=1},     0, 9, AF, "m" },
    { "2nd",   "2nd order (12 dB/8ve)", 0,                  AV_OPT_TYPE_CONST,  {.i64=0},     0, 0, AF, "m" },
    { "4th",   "4th order (24 dB/8ve)", 0,                  AV_OPT_TYPE_CONST,  {.i64=1},     0, 0, AF, "m" },
    { "6th",   "6th order (36 dB/8ve)", 0,                  AV_OPT_TYPE_CONST,  {.i64=2},     0, 0, AF, "m" },
    { "8th",   "8th order (48 dB/8ve)", 0,                  AV_OPT_TYPE_CONST,  {.i64=3},     0, 0, AF, "m" },
    { "10th",  "10th order (60 dB/8ve)",0,                  AV_OPT_TYPE_CONST,  {.i64=4},     0, 0, AF, "m" },
    { "12th",  "12th order (72 dB/8ve)",0,                  AV_OPT_TYPE_CONST,  {.i64=5},     0, 0, AF, "m" },
    { "14th",  "14th order (84 dB/8ve)",0,                  AV_OPT_TYPE_CONST,  {.i64=6},     0, 0, AF, "m" },
    { "16th",  "16th order (96 dB/8ve)",0,                  AV_OPT_TYPE_CONST,  {.i64=7},     0, 0, AF, "m" },
    { "18th",  "18th order (108 dB/8ve)",0,                 AV_OPT_TYPE_CONST,  {.i64=8},     0, 0, AF, "m" },
    { "20th",  "20th order (120 dB/8ve)",0,                 AV_OPT_TYPE_CONST,  {.i64=9},     0, 0, AF, "m" },
    { "level", "set input gain",        OFFSET(level_in),   AV_OPT_TYPE_FLOAT,  {.dbl=1},     0, 1, AF },
    { "gain",  "set output bands gain", OFFSET(gains_str),  AV_OPT_TYPE_STRING, {.str="1.f"}, 0, 0, AF },
    { NULL }
}

Definition at line 87 of file af_acrossover.c.

inputs

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 527 of file af_acrossover.c.

ff_af_acrossover

const AVFilter ff_af_acrossover

Initial value:

= {
    .name           = "acrossover",
    .description    = NULL_IF_CONFIG_SMALL("Split audio into per-bands streams."),
    .priv_size      = sizeof(AudioCrossoverContext),
    .priv_class     = &acrossover_class,
    .init           = init,
    .uninit         = uninit,
    FILTER_INPUTS(inputs),
    .outputs        = NULL,
    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
    .flags          = AVFILTER_FLAG_DYNAMIC_OUTPUTS |
                      AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 536 of file af_acrossover.c.