avf_showvolume.c File Reference

#include "libavutil/avstring.h"
#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_PEAK, VAR_VARS_NB }
enum	DisplayScale {   LINEAR, SQRT, CBRT, LOG,   RLOG, NB_SCALES, LINEAR, SQRT,   CBRT, LOG, FOURTHRT, FIFTHRT,   NB_SCALES, LINEAR, LOG, NB_DISPLAY_SCALE }

Functions
	AVFILTER_DEFINE_CLASS (showvolume)
static av_cold int	init (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static void	find_peak (float *src, int nb_samples, float *peak, float factor)
static void	find_rms (float *src, int nb_samples, float *rms, float factor)
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 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 []
AVFilter	ff_avf_showvolume

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(ShowVolumeContext, x)

Definition at line 69 of file avf_showvolume.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 70 of file avf_showvolume.c.

Enumeration Type Documentation

anonymous enum

Enumerator
VAR_VOLUME
VAR_CHANNEL
VAR_PEAK
VAR_VARS_NB

Definition at line 35 of file avf_showvolume.c.

enum DisplayScale

Enumerator
LINEAR
SQRT
CBRT
LOG
RLOG
NB_SCALES
LINEAR
SQRT
CBRT
LOG
FOURTHRT
FIFTHRT
NB_SCALES
LINEAR
LOG
NB_DISPLAY_SCALE

Definition at line 36 of file avf_showvolume.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

showvolume

)

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 100 of file avf_showvolume.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 115 of file avf_showvolume.c.

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

static

Definition at line 144 of file avf_showvolume.c.

Referenced by config_input().

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

static

Definition at line 153 of file avf_showvolume.c.

Referenced by config_input().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 161 of file avf_showvolume.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 199 of file avf_showvolume.c.

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

static

Definition at line 232 of file avf_showvolume.c.

Referenced by filter_frame().

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

static

Definition at line 266 of file avf_showvolume.c.

Referenced by filter_frame().

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

inlinestatic

Definition at line 278 of file avf_showvolume.c.

Referenced by filter_frame().

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

inlinestatic

Definition at line 293 of file avf_showvolume.c.

Referenced by filter_frame().

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

inlinestatic

Definition at line 304 of file avf_showvolume.c.

Referenced by filter_frame().

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

static

Definition at line 320 of file avf_showvolume.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 452 of file avf_showvolume.c.

Variable Documentation

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

static

Definition at line 34 of file avf_showvolume.c.

Referenced by init().

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"}, CHAR_MIN, CHAR_MAX, FLAGS },
    { "o", "set orientation", OFFSET(orientation), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "orientation" },
    {   "h", "horizontal", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "orientation" },
    {   "v", "vertical",   0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "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, "mode" },
    {   "p", "peak", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
    {   "r", "rms",  0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
    { "ds", "set display scale", OFFSET(display_scale), AV_OPT_TYPE_INT, {.i64=LINEAR}, LINEAR, NB_DISPLAY_SCALE - 1, FLAGS, "display_scale" },
    {   "lin", "linear", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, "display_scale" },
    {   "log", "log",  0, AV_OPT_TYPE_CONST, {.i64=LOG}, 0, 0, FLAGS, "display_scale" },
    { NULL }
}

Definition at line 72 of file avf_showvolume.c.

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 463 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 473 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 482 of file avf_showvolume.c.