avf_showvolume.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/xga_font_data.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	ShowVolumeContext

Macros
#define	OFFSET(x)   offsetof(ShowVolumeContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Enumerations
enum	{ VAR_VOLUME, VAR_CHANNEL, VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (showvolume)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	config_output (AVFilterLink *outlink)
static void	drawtext (AVFrame *pic, int x, int y, const char *txt)
static int	filter_frame (AVFilterLink *inlink, AVFrame *insamples)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	showvolume_options []
static const char *const	var_names [] = { "VOLUME", "CHANNEL", NULL }
static const AVFilterPad	showvolume_inputs []
static const AVFilterPad	showvolume_outputs []
AVFilter	ff_avf_showvolume

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(ShowVolumeContext, x)

Definition at line 45 of file avf_showvolume.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 46 of file avf_showvolume.c.

Enumeration Type Documentation

anonymous enum

Enumerator
VAR_VOLUME
VAR_CHANNEL
VAR_VARS_NB

Definition at line 63 of file avf_showvolume.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

showvolume

)

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 65 of file avf_showvolume.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 80 of file avf_showvolume.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 112 of file avf_showvolume.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 126 of file avf_showvolume.c.

static void drawtext ( AVFrame *  pic, int  x, int  y, const char *  txt  )

static

Definition at line 139 of file avf_showvolume.c.

Referenced by avfilter_register_all(), and filter_frame().

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

static

Definition at line 162 of file avf_showvolume.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 224 of file avf_showvolume.c.

Variable Documentation

const AVOption showvolume_options[]

static

Initial value:

= {
    { "rate", "set video rate",  OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
    { "r",    "set video rate",  OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, 0, FLAGS },
    { "b", "set border width",   OFFSET(b), AV_OPT_TYPE_INT, {.i64=1}, 0, 5, FLAGS },
    { "w", "set channel width",  OFFSET(w), AV_OPT_TYPE_INT, {.i64=400}, 40, 1080, FLAGS },
    { "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 100, FLAGS },
    { "f", "set fade",           OFFSET(f), AV_OPT_TYPE_INT, {.i64=20}, 1, 255, FLAGS },
    { "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="if(gte(VOLUME,-2), if(gte(VOLUME,-1),0xff0000ff, 0xff00ffff),0xff00ff00)"}, 0, 0, FLAGS },
    { "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS },
    { NULL }
}

Definition at line 48 of file avf_showvolume.c.

const char* const var_names[] = { "VOLUME", "CHANNEL", NULL }

static

Definition at line 62 of file avf_showvolume.c.

Referenced by init().

const AVFilterPad showvolume_inputs[]

static

Initial value:

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

Definition at line 232 of file avf_showvolume.c.

const AVFilterPad showvolume_outputs[]

static

Initial value:

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

Definition at line 242 of file avf_showvolume.c.

AVFilter ff_avf_showvolume

Initial value:

= {
    .name          = "showvolume",
    .description   = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .priv_size     = sizeof(ShowVolumeContext),
    .inputs        = showvolume_inputs,
    .outputs       = showvolume_outputs,
    .priv_class    = &showvolume_class,
}

Definition at line 251 of file avf_showvolume.c.