avf_showspectrum.c File Reference

audio to spectrum (video) transmedia filter, based on ffplay rdft showmode (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini). More...

#include <math.h>
#include "libavcodec/avfft.h"
#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/xga_font_data.h"
#include "audio.h"
#include "video.h"
#include "avfilter.h"
#include "filters.h"
#include "internal.h"
#include "window_func.h"

Go to the source code of this file.

Data Structures
struct	ShowSpectrumContext
struct	ColorTable

Macros
#define	OFFSET(x)   offsetof(ShowSpectrumContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	RE(y, ch)   s->fft_data[ch][y].re
#define	IM(y, ch)   s->fft_data[ch][y].im
#define	MAGNITUDE(y, ch)   hypot(RE(y, ch), IM(y, ch))
#define	PHASE(y, ch)   atan2(IM(y, ch), RE(y, ch))

Enumerations
enum	DisplayMode {   SINGLE, SEPARATE, NB_DMODES, LINE,   BAR, DOT, NB_MODES, COMBINED,   SEPARATE, NB_MODES }
enum	DataMode { D_MAGNITUDE, D_PHASE, NB_DMODES }
enum	DisplayScale {   LINEAR, SQRT, CBRT, LOG,   RLOG, NB_SCALES, LINEAR, SQRT,   CBRT, LOG, FOURTHRT, FIFTHRT,   NB_SCALES, LINEAR, LOG, NB_DISPLAY_SCALE }
enum	ColorMode {   CHANNEL, INTENSITY, RAINBOW, MORELAND,   NEBULAE, FIRE, FIERY, FRUIT,   COOL, MAGMA, GREEN, NB_CLMODES,   COLOR_MODE_NONE = -1, COLOR_MODE_BT709, COLOR_MODE_FCC, COLOR_MODE_BT601,   COLOR_MODE_SMPTE240M, COLOR_MODE_BT2020, COLOR_MODE_COUNT }
enum	SlideMode {   REPLACE, SCROLL, NB_SLIDES, REPLACE,   SCROLL, FULLFRAME, RSCROLL, NB_SLIDES,   REPLACE, SCROLL, FULLFRAME, RSCROLL,   NB_SLIDES }
enum	Orientation {   VERTICAL, HORIZONTAL, NB_ORIENTATIONS, VERTICAL,   HORIZONTAL, NB_ORIENTATIONS }

Functions
	AVFILTER_DEFINE_CLASS (showspectrum)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	run_channel_fft (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static void	drawtext (AVFrame *pic, int x, int y, const char *txt, int o)
static void	color_range (ShowSpectrumContext *s, int ch, float *yf, float *uf, float *vf)
static void	pick_color (ShowSpectrumContext *s, float yf, float uf, float vf, float a, float *out)
static char *	get_time (AVFilterContext *ctx, float seconds, int x)
static int	draw_legend (AVFilterContext *ctx, int samples)
static int	config_output (AVFilterLink *outlink)
static int	calc_channel_magnitudes (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	calc_channel_phases (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static void	acalc_magnitudes (ShowSpectrumContext *s)
static void	scale_magnitudes (ShowSpectrumContext *s, float scale)
static void	clear_combine_buffer (ShowSpectrumContext *s, int size)
static int	plot_channel (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static int	plot_spectrum_column (AVFilterLink *inlink, AVFrame *insamples)

Variables
static const AVOption	showspectrum_options []
static const struct ColorTable	color_table [][8]

Detailed Description

audio to spectrum (video) transmedia filter, based on ffplay rdft showmode (by Michael Niedermayer) and lavfi/avf_showwaves (by Stefano Sabatini).

Definition in file avf_showspectrum.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(ShowSpectrumContext, x)

Definition at line 100 of file avf_showspectrum.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 101 of file avf_showspectrum.c.

#define RE	(		y,
			ch
	)		s->fft_data[ch][y].re

Definition at line 992 of file avf_showspectrum.c.

#define IM	(		y,
			ch
	)		s->fft_data[ch][y].im

Definition at line 993 of file avf_showspectrum.c.

#define MAGNITUDE	(		y,
			ch
	)		hypot(RE(y, ch), IM(y, ch))

Definition at line 994 of file avf_showspectrum.c.

Referenced by acalc_magnitudes(), and calc_channel_magnitudes().

#define PHASE	(		y,
			ch
	)		atan2(IM(y, ch), RE(y, ch))

Definition at line 995 of file avf_showspectrum.c.

Referenced by calc_channel_phases().

Enumeration Type Documentation

enum DisplayMode

Enumerator
SINGLE
SEPARATE
NB_DMODES
LINE
BAR
DOT
NB_MODES
COMBINED
SEPARATE
NB_MODES

Definition at line 46 of file avf_showspectrum.c.

enum DataMode

Enumerator
D_MAGNITUDE
D_PHASE
NB_DMODES

Definition at line 47 of file avf_showspectrum.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 48 of file avf_showspectrum.c.

enum ColorMode

Enumerator
CHANNEL
INTENSITY
RAINBOW
MORELAND
NEBULAE
FIRE
FIERY
FRUIT
COOL
MAGMA
GREEN
NB_CLMODES
COLOR_MODE_NONE
COLOR_MODE_BT709
COLOR_MODE_FCC
COLOR_MODE_BT601
COLOR_MODE_SMPTE240M
COLOR_MODE_BT2020
COLOR_MODE_COUNT

Definition at line 49 of file avf_showspectrum.c.

enum SlideMode

Enumerator
REPLACE
SCROLL
NB_SLIDES
REPLACE
SCROLL
FULLFRAME
RSCROLL
NB_SLIDES
REPLACE
SCROLL
FULLFRAME
RSCROLL
NB_SLIDES

Definition at line 50 of file avf_showspectrum.c.

enum Orientation

Enumerator
VERTICAL
HORIZONTAL
NB_ORIENTATIONS
VERTICAL
HORIZONTAL
NB_ORIENTATIONS

Definition at line 51 of file avf_showspectrum.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

showspectrum

)

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 259 of file avf_showspectrum.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 305 of file avf_showspectrum.c.

static int run_channel_fft ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 336 of file avf_showspectrum.c.

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

static

Definition at line 436 of file avf_showspectrum.c.

Referenced by draw_legend(), and plot_spectrum_column().

static void color_range ( ShowSpectrumContext *  s, int  ch, float *  yf, float *  uf, float *  vf  )

static

Definition at line 470 of file avf_showspectrum.c.

Referenced by plot_channel().

static void pick_color ( ShowSpectrumContext *  s, float  yf, float  uf, float  vf, float  a, float *  out  )

static

Definition at line 528 of file avf_showspectrum.c.

Referenced by draw_legend(), and plot_channel().

static char* get_time ( AVFilterContext *  ctx, float  seconds, int  x  )

static

Definition at line 572 of file avf_showspectrum.c.

Referenced by draw_legend(), and plot_spectrum_column().

static int draw_legend ( AVFilterContext *  ctx, int  samples  )

static

Definition at line 587 of file avf_showspectrum.c.

Referenced by config_output().

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 776 of file avf_showspectrum.c.

static int calc_channel_magnitudes ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 997 of file avf_showspectrum.c.

static int calc_channel_phases ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 1012 of file avf_showspectrum.c.

static void acalc_magnitudes ( ShowSpectrumContext *  s )

static

Definition at line 1026 of file avf_showspectrum.c.

static void scale_magnitudes ( ShowSpectrumContext *  s, float  scale  )

static

Definition at line 1040 of file avf_showspectrum.c.

static void clear_combine_buffer ( ShowSpectrumContext *  s, int  size  )

static

Definition at line 1052 of file avf_showspectrum.c.

Referenced by plot_spectrum_column().

static int plot_channel ( AVFilterContext *  ctx, void *  arg, int  jobnr, int  nb_jobs  )

static

Definition at line 1063 of file avf_showspectrum.c.

Referenced by plot_spectrum_column().

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

static

Definition at line 1125 of file avf_showspectrum.c.

Variable Documentation

const AVOption showspectrum_options[]

static

Definition at line 103 of file avf_showspectrum.c.

const struct ColorTable color_table[][8]

static

Referenced by pick_color().