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)

Enumerations
enum	ShowWavesMode {   MODE_POINT, MODE_LINE, MODE_P2P, MODE_CENTERED_LINE,   MODE_NB }

Functions
	AVFILTER_DEFINE_CLASS (showwaves)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_output (AVFilterLink *outlink)
static int	push_frame (AVFilterLink *outlink)
static int	request_frame (AVFilterLink *outlink)
static void	draw_sample_point (uint8_t *buf, int height, int linesize, int16_t sample, int16_t *prev_y, int intensity)
static void	draw_sample_line (uint8_t *buf, int height, int linesize, int16_t sample, int16_t *prev_y, int intensity)
static void	draw_sample_p2p (uint8_t *buf, int height, int linesize, int16_t sample, int16_t *prev_y, int intensity)
static void	draw_sample_cline (uint8_t *buf, int height, int linesize, int16_t sample, int16_t *prev_y, int intensity)
static int	filter_frame (AVFilterLink *inlink, AVFrame *insamples)
static av_cold int	init (AVFilterContext *ctx)

Variables
static const AVOption	showwaves_options []
static const AVFilterPad	showwaves_inputs []
static const AVFilterPad	showwaves_outputs []
AVFilter	ff_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 59 of file avf_showwaves.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 60 of file avf_showwaves.c.

#define MAX_INT16   ((1<<15) -1)

Definition at line 181 of file avf_showwaves.c.

Referenced by draw_sample_line(), draw_sample_p2p(), and draw_sample_point().

Enumeration Type Documentation

enum ShowWavesMode

Enumerator:

MODE_POINT
MODE_LINE
MODE_P2P
MODE_CENTERED_LINE
MODE_NB

Definition at line 35 of file avf_showwaves.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

showwaves

)

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 79 of file avf_showwaves.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 87 of file avf_showwaves.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 121 of file avf_showwaves.c.

static int push_frame ( AVFilterLink *  outlink )

inlinestatic

Definition at line 148 of file avf_showwaves.c.

Referenced by filter_frame(), and request_frame().

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 165 of file avf_showwaves.c.

static void draw_sample_point ( uint8_t *  buf, int  height, int  linesize, int16_t  sample, int16_t *  prev_y, int  intensity  )

static

Definition at line 183 of file avf_showwaves.c.

Referenced by init().

static void draw_sample_line ( uint8_t *  buf, int  height, int  linesize, int16_t  sample, int16_t *  prev_y, int  intensity  )

static

Definition at line 191 of file avf_showwaves.c.

Referenced by init().

static void draw_sample_p2p ( uint8_t *  buf, int  height, int  linesize, int16_t  sample, int16_t *  prev_y, int  intensity  )

static

Definition at line 204 of file avf_showwaves.c.

Referenced by init().

static void draw_sample_cline ( uint8_t *  buf, int  height, int  linesize, int16_t  sample, int16_t *  prev_y, int  intensity  )

static

Definition at line 223 of file avf_showwaves.c.

Referenced by init().

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

static

Definition at line 234 of file avf_showwaves.c.

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 289 of file avf_showwaves.c.

Variable Documentation

const AVOption showwaves_options[]

static

Initial value:

= {
    { "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 },
    { "mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1, FLAGS, "mode"},
        { "point", "draw a point for each sample",         0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT},         .flags=FLAGS, .unit="mode"},
        { "line",  "draw a line for each sample",          0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE},          .flags=FLAGS, .unit="mode"},
        { "p2p",   "draw a line between samples",          0, AV_OPT_TYPE_CONST, {.i64=MODE_P2P},           .flags=FLAGS, .unit="mode"},
        { "cline", "draw a centered line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CENTERED_LINE}, .flags=FLAGS, .unit="mode"},
    { "n",    "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
    { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
    { "r",    "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS },
    { "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS },
    { NULL }
}

Definition at line 62 of file avf_showwaves.c.

const AVFilterPad showwaves_inputs[]

static

Initial value:

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

Definition at line 304 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 313 of file avf_showwaves.c.

AVFilter ff_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 323 of file avf_showwaves.c.