libavfilter/avf_showwaves.c File Reference

audio to video multimedia filter More...

#include "libavutil/audioconvert.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "avfilter.h"
#include "formats.h"
#include "audio.h"
#include "video.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	ShowWavesContext
Defines
#define	OFFSET(x)   offsetof(ShowWavesContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	MAX_INT16   ((1<<15) -1)
Functions
	AVFILTER_DEFINE_CLASS (showwaves)
static av_cold int	init (AVFilterContext *ctx, const char *args)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_output (AVFilterLink *outlink)
static void	push_frame (AVFilterLink *outlink)
static int	request_frame (AVFilterLink *outlink)
static int	filter_samples (AVFilterLink *inlink, AVFilterBufferRef *insamples)
Variables
static const AVOption	showwaves_options []
AVFilter	avfilter_avf_showwaves

---

Detailed Description

audio to video multimedia filter

Definition in file avf_showwaves.c.

---

Define Documentation

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 48 of file avf_showwaves.c.

#define MAX_INT16   ((1<<15) -1)

Definition at line 180 of file avf_showwaves.c.

Referenced by filter_samples().

#define OFFSET

(

x

)

offsetof(ShowWavesContext, x)

Definition at line 47 of file avf_showwaves.c.

---

Function Documentation

AVFILTER_DEFINE_CLASS

(

showwaves

)

static int config_output

(

AVFilterLink *

outlink

)

[static]

Definition at line 118 of file avf_showwaves.c.

static int filter_samples	(	AVFilterLink *	inlink,
		AVFilterBufferRef *	insamples
	)			[static]

Definition at line 182 of file avf_showwaves.c.

static av_cold int init	(	AVFilterContext *	ctx,
		const char *	args
	)			[static]

Definition at line 61 of file avf_showwaves.c.

static void push_frame

(

AVFilterLink *

outlink

)

[inline, static]

Definition at line 152 of file avf_showwaves.c.

static int query_formats

(

AVFilterContext *

ctx

)

[static]

Definition at line 84 of file avf_showwaves.c.

static int request_frame

(

AVFilterLink *

outlink

)

[static]

Definition at line 164 of file avf_showwaves.c.

static av_cold void uninit

(

AVFilterContext *

ctx

)

[static]

Definition at line 76 of file avf_showwaves.c.

---

Variable Documentation

AVFilter avfilter_avf_showwaves

Initial value:

 {
    .name           = "showwaves",
    .description    = NULL_IF_CONFIG_SMALL("Convert input audio to a video output."),
    .init           = init,
    .uninit         = uninit,
    .query_formats  = query_formats,
    .priv_size      = sizeof(ShowWavesContext),

    .inputs  = (const AVFilterPad[]) {
        {
            .name           = "default",
            .type           = AVMEDIA_TYPE_AUDIO,
            .filter_samples = filter_samples,
            .min_perms      = AV_PERM_READ,
        },
        { .name = NULL }
    },

    .outputs = (const AVFilterPad[]) {
        {
            .name           = "default",
            .type           = AVMEDIA_TYPE_VIDEO,
            .config_props   = config_output,
            .request_frame  = request_frame,
        },
        { .name = NULL }
    },

    .priv_class = &showwaves_class,
}

Definition at line 229 of file avf_showwaves.c.

const AVOption showwaves_options[] [static]

Initial value:

 {
    { "rate", "set video rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
    { "r",    "set video rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
    { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
    { "s",    "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS },
    { "n",    "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
    { NULL },
}

Definition at line 50 of file avf_showwaves.c.