af_acrossover.c File Reference

Crossover filter. More...

#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.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	BiquadContext
struct	CrossoverChannel
struct	AudioCrossoverContext

Macros
#define	MAX_SPLITS   16
#define	MAX_BANDS   MAX_SPLITS + 1
#define	OFFSET(x)   offsetof(AudioCrossoverContext, x)
#define	AF   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (acrossover)
static av_cold int	init (AVFilterContext *ctx)
static void	set_lp (BiquadContext *b, float fc, float q, float sr)
static void	set_hp (BiquadContext *b, float fc, float q, float sr)
static int	config_input (AVFilterLink *inlink)
static int	query_formats (AVFilterContext *ctx)
static double	biquad_process (BiquadContext *b, double in)
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 []
AVFilter	ff_af_acrossover

Detailed Description

Crossover filter.

Split an audio stream into several bands.

Definition in file af_acrossover.c.

Macro Definition Documentation

#define MAX_SPLITS   16

Definition at line 37 of file af_acrossover.c.

Referenced by init().

#define MAX_BANDS   MAX_SPLITS + 1

Definition at line 38 of file af_acrossover.c.

Referenced by filter_frame().

#define OFFSET

(

x

)

offsetof(AudioCrossoverContext, x)

Definition at line 65 of file af_acrossover.c.

#define AF   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM

Definition at line 66 of file af_acrossover.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

acrossover

)

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 79 of file af_acrossover.c.

static void set_lp ( BiquadContext *  b, float  fc, float  q, float  sr  )

static

Definition at line 134 of file af_acrossover.c.

Referenced by config_input().

static void set_hp ( BiquadContext *  b, float  fc, float  q, float  sr  )

static

Definition at line 148 of file af_acrossover.c.

Referenced by config_input().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 163 of file af_acrossover.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 211 of file af_acrossover.c.

static double biquad_process ( BiquadContext *  b, double  in  )

static

Definition at line 241 of file af_acrossover.c.

Referenced by filter_frame().

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

static

Definition at line 253 of file af_acrossover.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 311 of file af_acrossover.c.

Variable Documentation

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 order",             OFFSET(order),      AV_OPT_TYPE_INT,    {.i64=1},     0, 2, AF, "m" },
    { "2nd",   "2nd order",             0,                  AV_OPT_TYPE_CONST,  {.i64=0},     0, 0, AF, "m" },
    { "4th",   "4th order",             0,                  AV_OPT_TYPE_CONST,  {.i64=1},     0, 0, AF, "m" },
    { "8th",   "8th order",             0,                  AV_OPT_TYPE_CONST,  {.i64=2},     0, 0, AF, "m" },
    { NULL }
}

Definition at line 68 of file af_acrossover.c.

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 322 of file af_acrossover.c.

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,
    .query_formats  = query_formats,
    .inputs         = inputs,
    .outputs        = NULL,
    .flags          = AVFILTER_FLAG_DYNAMIC_OUTPUTS,
}

Definition at line 332 of file af_acrossover.c.