avf_showwaves.c File Reference

audio to video multimedia filter More...

#include "libavutil/channel_layout.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

Macros
#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_frame (AVFilterLink *inlink, AVFilterBufferRef *insamples)

Variables
static const AVOption	showwaves_options []
static const AVFilterPad	showwaves_inputs []
static const AVFilterPad	showwaves_outputs []
AVFilter	avfilter_avf_showwaves

Detailed Description

audio to video multimedia filter

Definition in file avf_showwaves.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(ShowWavesContext, x)

Definition at line 47 of file avf_showwaves.c.

#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 178 of file avf_showwaves.c.

Referenced by filter_frame().

Function Documentation

AVFILTER_DEFINE_CLASS

(

showwaves

)

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

static

Definition at line 61 of file avf_showwaves.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 76 of file avf_showwaves.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 84 of file avf_showwaves.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 118 of file avf_showwaves.c.

static void push_frame ( AVFilterLink *  outlink )

inlinestatic

Definition at line 152 of file avf_showwaves.c.

Referenced by filter_frame(), and request_frame().

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 162 of file avf_showwaves.c.

static int filter_frame ( AVFilterLink *  inlink, AVFilterBufferRef *  insamples  )

static

Definition at line 180 of file avf_showwaves.c.

Variable Documentation

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.

const AVFilterPad showwaves_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
        .min_perms    = AV_PERM_READ,
    },
    { NULL }
}

Definition at line 229 of file avf_showwaves.c.

const AVFilterPad showwaves_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .config_props  = config_output,
        .request_frame = request_frame,
    },
    { NULL }
}

Definition at line 239 of file avf_showwaves.c.

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         = showwaves_inputs,
    .outputs        = showwaves_outputs,
    .priv_class     = &showwaves_class,
}

Definition at line 249 of file avf_showwaves.c.