avf_showvolume.c File Reference

#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/xga_font_data.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	ShowVolumeContext

Macros
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Enumerations
enum	{ VAR_VOLUME , VAR_CHANNEL , VAR_PEAK , VAR_VARS_NB }
enum	DisplayScale { LINEAR , LOG , NB_DISPLAY_SCALE }

Functions
	AVFILTER_DEFINE_CLASS (showvolume)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
static void	find_peak (float *src, int nb_samples, float *peak)
static void	find_rms (float *src, int nb_samples, float *rms)
static int	config_input (AVFilterLink *inlink)
static int	config_output (AVFilterLink *outlink)
static void	drawtext (AVFrame *pic, int x, int y, const char *txt, int o)
static void	clear_picture (ShowVolumeContext *s, AVFilterLink *outlink)
static int	calc_max_draw (ShowVolumeContext *s, AVFilterLink *outlink, float max)
static void	calc_persistent_max (ShowVolumeContext *s, float max, int channel)
static void	draw_max_line (ShowVolumeContext *s, int max_draw, int channel)
static int	filter_frame (AVFilterLink *inlink, AVFrame *insamples)
static int	activate (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)

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

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(ShowVolumeContext, x)

Definition at line 67 of file avf_showvolume.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 68 of file avf_showvolume.c.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
VAR_VOLUME
VAR_CHANNEL
VAR_PEAK
VAR_VARS_NB

Definition at line 33 of file avf_showvolume.c.

DisplayScale

enum DisplayScale

Enumerator
LINEAR
LOG
NB_DISPLAY_SCALE

Definition at line 34 of file avf_showvolume.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

showvolume

)

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 98 of file avf_showvolume.c.

query_formats()

static int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 113 of file avf_showvolume.c.

find_peak()

static void find_peak ( float * src, int nb_samples, float * peak )

static

Definition at line 133 of file avf_showvolume.c.

find_rms()

static void find_rms ( float * src, int nb_samples, float * rms )

static

Definition at line 143 of file avf_showvolume.c.

Referenced by config_input().

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 152 of file avf_showvolume.c.

config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 187 of file avf_showvolume.c.

drawtext()

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

static

Definition at line 222 of file avf_showvolume.c.

Referenced by filter_frame().

clear_picture()

static void clear_picture ( ShowVolumeContext * s, AVFilterLink * outlink )

static

Definition at line 256 of file avf_showvolume.c.

Referenced by filter_frame().

calc_max_draw()

static int calc_max_draw ( ShowVolumeContext * s, AVFilterLink * outlink, float max )

inlinestatic

Definition at line 268 of file avf_showvolume.c.

Referenced by filter_frame().

calc_persistent_max()

static void calc_persistent_max ( ShowVolumeContext * s, float max, int channel )

inlinestatic

Definition at line 283 of file avf_showvolume.c.

Referenced by filter_frame().

draw_max_line()

static void draw_max_line ( ShowVolumeContext * s, int max_draw, int channel )

inlinestatic

Definition at line 294 of file avf_showvolume.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 310 of file avf_showvolume.c.

Referenced by activate().

activate()

static int activate ( AVFilterContext * ctx )

static

Definition at line 449 of file avf_showvolume.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 476 of file avf_showvolume.c.

Variable Documentation

var_names

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

static

Definition at line 32 of file avf_showvolume.c.

showvolume_options

const AVOption showvolume_options[]

static

Initial value:

= {
    { "rate", "set video rate",  OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, FLAGS },
    { "r",    "set video rate",  OFFSET(frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="25"}, 0, INT_MAX, 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}, 80, 8192, FLAGS },
    { "h", "set channel height", OFFSET(h), AV_OPT_TYPE_INT, {.i64=20}, 1, 900, FLAGS },
    { "f", "set fade",           OFFSET(f), AV_OPT_TYPE_DOUBLE, {.dbl=0.95}, 0, 1, FLAGS },
    { "c", "set volume color expression", OFFSET(color), AV_OPT_TYPE_STRING, {.str="PEAK*255+floor((1-PEAK)*255)*256+0xff000000"}, 0, 0, FLAGS },
    { "t", "display channel names", OFFSET(draw_text), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
    { "v", "display volume value", OFFSET(draw_volume), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
    { "dm", "duration for max value display", OFFSET(draw_persistent_duration), AV_OPT_TYPE_DOUBLE, {.dbl=0.}, 0, 9000, FLAGS},
    { "dmc","set color of the max value line", OFFSET(persistant_max_rgba), AV_OPT_TYPE_COLOR, {.str = "orange"}, 0, 0, FLAGS },
    { "o", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, .unit = "orientation" },
    {   "h", "horizontal", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "orientation" },
    {   "v", "vertical",   0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "orientation" },
    { "s", "set step size", OFFSET(step), AV_OPT_TYPE_INT, {.i64=0}, 0, 5, FLAGS },
    { "p", "set background opacity", OFFSET(bgopacity), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 1, FLAGS },
    { "m", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, .unit = "mode" },
    {   "p", "peak", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, .unit = "mode" },
    {   "r", "rms",  0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, .unit = "mode" },
    { "ds", "set display scale", OFFSET(display_scale), AV_OPT_TYPE_INT, {.i64=LINEAR}, LINEAR, NB_DISPLAY_SCALE - 1, FLAGS, .unit = "display_scale" },
    {   "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, .unit = "display_scale" },
    {   "log", "log",  0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, .unit = "display_scale" },
    { NULL }
}

Definition at line 70 of file avf_showvolume.c.

showvolume_inputs

const AVFilterPad showvolume_inputs[]

static

Initial value:

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

Definition at line 489 of file avf_showvolume.c.

showvolume_outputs

const AVFilterPad showvolume_outputs[]

static

Initial value:

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

Definition at line 497 of file avf_showvolume.c.

ff_avf_showvolume

const FFFilter ff_avf_showvolume

Initial value:

= {
    .p.name        = "showvolume",
    .p.description = NULL_IF_CONFIG_SMALL("Convert input audio volume to video output."),
    .p.priv_class  = &showvolume_class,
    .init          = init,
    .activate      = activate,
    .uninit        = uninit,
    .priv_size     = sizeof(ShowVolumeContext),
    FILTER_INPUTS(showvolume_inputs),
    FILTER_OUTPUTS(showvolume_outputs),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 505 of file avf_showvolume.c.