af_aderivative.c File Reference

#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"

Go to the source code of this file.

Data Structures
struct	ADerivativeContext

Macros
#define	DERIVATIVE(name, type)
#define	INTEGRAL(name, type)

Functions
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static av_cold void	uninit (AVFilterContext *ctx)
	AVFILTER_DEFINE_CLASS_EXT (aderivative, "aderivative/aintegral", aderivative_options)

Variables
static const AVFilterPad	aderivative_inputs []
static const AVOption	aderivative_options []
const FFFilter	ff_af_aderivative
const FFFilter	ff_af_aintegral

Macro Definition Documentation

DERIVATIVE

#define DERIVATIVE	(		name,
			type )

Value:

static void aderivative_## name ##p(void **d, void **p, const void **s, \
                                    int nb_samples, int channels)       \
{                                                                       \
    int n, c;                                                           \
                                                                        \
    for (c = 0; c < channels; c++) {                                    \
        const type *src = s[c];                                         \
        type *dst = d[c];                                               \
        type *prv = p[c];                                               \
                                                                        \
        for (n = 0; n < nb_samples; n++) {                              \
            const type current = src[n];                                \
                                                                        \
            dst[n] = current - prv[0];                                  \
            prv[0] = current;                                           \
        }                                                               \
    }                                                                   \
}

Definition at line 31 of file af_aderivative.c.

INTEGRAL

#define INTEGRAL	(		name,
			type )

Value:

static void aintegral_## name ##p(void **d, void **p, const void **s, \
                                  int nb_samples, int channels)       \
{                                                                     \
    int n, c;                                                         \
                                                                      \
    for (c = 0; c < channels; c++) {                                  \
        const type *src = s[c];                                       \
        type *dst = d[c];                                             \
        type *prv = p[c];                                             \
                                                                      \
        for (n = 0; n < nb_samples; n++) {                            \
            const type current = src[n];                              \
                                                                      \
            dst[n] = current + prv[0];                                \
            prv[0] = dst[n];                                          \
        }                                                             \
    }                                                                 \
}

Definition at line 56 of file af_aderivative.c.

Function Documentation

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 79 of file af_aderivative.c.

filter_frame()

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

static

Definition at line 102 of file af_aderivative.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 141 of file af_aderivative.c.

AVFILTER_DEFINE_CLASS_EXT()

AVFILTER_DEFINE_CLASS_EXT	(	aderivative	,
		"aderivative/aintegral"	,
		aderivative_options	)

Variable Documentation

aderivative_inputs

const AVFilterPad aderivative_inputs[]

static

Initial value:

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

Definition at line 148 of file af_aderivative.c.

aderivative_options

const AVOption aderivative_options[]

static

Initial value:

= {
    { NULL }
}

Definition at line 157 of file af_aderivative.c.

Referenced by AVFILTER_DEFINE_CLASS_EXT().

ff_af_aderivative

const FFFilter ff_af_aderivative

Initial value:

= {
    .p.name        = "aderivative",
    .p.description = NULL_IF_CONFIG_SMALL("Compute derivative of input audio."),
    .p.priv_class  = &aderivative_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
    .priv_size     = sizeof(ADerivativeContext),
    .uninit        = uninit,
    FILTER_INPUTS(aderivative_inputs),
    FILTER_OUTPUTS(ff_audio_default_filterpad),
    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_S16P, AV_SAMPLE_FMT_FLTP,
                      AV_SAMPLE_FMT_S32P, AV_SAMPLE_FMT_DBLP),
}

Definition at line 163 of file af_aderivative.c.

ff_af_aintegral

const FFFilter ff_af_aintegral

Initial value:

= {
    .p.name        = "aintegral",
    .p.description = NULL_IF_CONFIG_SMALL("Compute integral of input audio."),
    .p.priv_class  = &aderivative_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
    .priv_size     = sizeof(ADerivativeContext),
    .uninit        = uninit,
    FILTER_INPUTS(aderivative_inputs),
    FILTER_OUTPUTS(ff_audio_default_filterpad),
    FILTER_SAMPLEFMTS(AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_DBLP),
}

Definition at line 176 of file af_aderivative.c.