af_apulsator.c File Reference

#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"

Go to the source code of this file.

Data Structures
struct	SimpleLFO
struct	AudioPulsatorContext

Macros
#define	OFFSET(x)   offsetof(AudioPulsatorContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Enumerations
enum	PulsatorModes {   SINE, TRIANGLE, SQUARE, SAWUP,   SAWDOWN, NB_MODES }
enum	PulsatorTimings { UNIT_BPM, UNIT_MS, UNIT_HZ, NB_TIMINGS }

Functions
	AVFILTER_DEFINE_CLASS (apulsator)
static void	lfo_advance (SimpleLFO *lfo, unsigned count)
static double	lfo_get_value (SimpleLFO *lfo)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)

Variables
static const AVOption	apulsator_options []
static const AVFilterPad	inputs []
static const AVFilterPad	outputs []
AVFilter	ff_af_apulsator

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(AudioPulsatorContext, x)

Definition at line 57 of file af_apulsator.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 58 of file af_apulsator.c.

Enumeration Type Documentation

enum PulsatorModes

Enumerator
SINE
TRIANGLE
SQUARE
SAWUP
SAWDOWN
NB_MODES

Definition at line 27 of file af_apulsator.c.

enum PulsatorTimings

Enumerator
UNIT_BPM
UNIT_MS
UNIT_HZ
NB_TIMINGS

Definition at line 28 of file af_apulsator.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

apulsator

)

static void lfo_advance ( SimpleLFO *  lfo, unsigned  count  )

static

Definition at line 85 of file af_apulsator.c.

Referenced by filter_frame().

static double lfo_get_value ( SimpleLFO *  lfo )

static

Definition at line 92 of file af_apulsator.c.

Referenced by filter_frame().

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

static

Definition at line 127 of file af_apulsator.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 186 of file af_apulsator.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 202 of file af_apulsator.c.

Variable Documentation

const AVOption apulsator_options[]

static

Initial value:

= {
    { "level_in",   "set input gain", OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, FLAGS, },
    { "level_out", "set output gain", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, FLAGS, },
    { "mode",             "set mode", OFFSET(mode),      AV_OPT_TYPE_INT,    {.i64=SINE}, SINE,   NB_MODES-1, FLAGS, "mode" },
    {   "sine",                 NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SINE},    0,            0, FLAGS, "mode" },
    {   "triangle",             NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=TRIANGLE},0,            0, FLAGS, "mode" },
    {   "square",               NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SQUARE},  0,            0, FLAGS, "mode" },
    {   "sawup",                NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SAWUP},   0,            0, FLAGS, "mode" },
    {   "sawdown",              NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=SAWDOWN}, 0,            0, FLAGS, "mode" },
    { "amount",     "set modulation", OFFSET(amount),    AV_OPT_TYPE_DOUBLE, {.dbl=1},       0,            1, FLAGS },
    { "offset_l",     "set offset L", OFFSET(offset_l),  AV_OPT_TYPE_DOUBLE, {.dbl=0},       0,            1, FLAGS },
    { "offset_r",     "set offset R", OFFSET(offset_r),  AV_OPT_TYPE_DOUBLE, {.dbl=.5},      0,            1, FLAGS },
    { "width",     "set pulse width", OFFSET(pwidth),    AV_OPT_TYPE_DOUBLE, {.dbl=1},       0,            2, FLAGS },
    { "timing",         "set timing", OFFSET(timing),    AV_OPT_TYPE_INT,    {.i64=2},       0, NB_TIMINGS-1, FLAGS, "timing" },
    {   "bpm",                  NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=UNIT_BPM},  0,          0, FLAGS, "timing" },
    {   "ms",                   NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=UNIT_MS},   0,          0, FLAGS, "timing" },
    {   "hz",                   NULL, 0,                 AV_OPT_TYPE_CONST,  {.i64=UNIT_HZ},   0,          0, FLAGS, "timing" },
    { "bpm",               "set BPM", OFFSET(bpm),       AV_OPT_TYPE_DOUBLE, {.dbl=120},    30,          300, FLAGS },
    { "ms",                 "set ms", OFFSET(ms),        AV_OPT_TYPE_INT,    {.i64=500},    10,         2000, FLAGS },
    { "hz",          "set frequency", OFFSET(hz),        AV_OPT_TYPE_DOUBLE, {.dbl=2},    0.01,          100, FLAGS },
    { NULL }
}

Definition at line 60 of file af_apulsator.c.

const AVFilterPad inputs[]

static

Initial value:

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

Definition at line 231 of file af_apulsator.c.

const AVFilterPad outputs[]

static

Initial value:

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

Definition at line 241 of file af_apulsator.c.

AVFilter ff_af_apulsator

Initial value:

= {
    .name          = "apulsator",
    .description   = NULL_IF_CONFIG_SMALL("Audio pulsator."),
    .priv_size     = sizeof(AudioPulsatorContext),
    .priv_class    = &apulsator_class,
    .query_formats = query_formats,
    .inputs        = inputs,
    .outputs       = outputs,
}

Definition at line 249 of file af_apulsator.c.