#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"

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) hypotf(RE(y, ch), IM(y, ch))

#define	PHASE(y, ch) atan2f(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	FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES, F_LINEAR, F_LOG, NB_FSCALES }

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, VIRIDIS, PLASMA, CIVIDIS, TERRAIN, 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 float	log_scale (const float value, const float min, const float max)

static float	get_log_hz (const int bin, const int num_bins, const float sample_rate)

static float	inv_log_scale (const float value, const float min, const float max)

static float	bin_pos (const int bin, const int num_bins, const float sample_rate)

static int	draw_legend (AVFilterContext *ctx, int samples)

static float	get_value (AVFilterContext *ctx, int ch, int y)

static int	plot_channel_lin (AVFilterContext ctx, void arg, int jobnr, int nb_jobs)

static int	plot_channel_log (AVFilterContext ctx, void arg, int jobnr, int nb_jobs)

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_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

◆ OFFSET

#define OFFSET ( x ) offsetof(ShowSpectrumContext, x)

Definition at line 103 of file avf_showspectrum.c.

◆ FLAGS

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 104 of file avf_showspectrum.c.

◆ RE

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

Definition at line 1199 of file avf_showspectrum.c.

◆ IM

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

Definition at line 1200 of file avf_showspectrum.c.

◆ MAGNITUDE

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

Definition at line 1201 of file avf_showspectrum.c.

◆ PHASE

#define PHASE	(	y,
		ch
	)	atan2f(IM(y, ch), RE(y, ch))

Definition at line 1202 of file avf_showspectrum.c.

Enumeration Type Documentation

◆ DisplayMode

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.

◆ DataMode

enum DataMode

Enumerator
D_MAGNITUDE
D_PHASE
NB_DMODES

Definition at line 47 of file avf_showspectrum.c.

◆ FrequencyScale

enum FrequencyScale

Enumerator
FS_LINEAR
FS_LOG
FS_RLOG
NB_FSCALES
F_LINEAR
F_LOG
NB_FSCALES

Definition at line 48 of file avf_showspectrum.c.

◆ DisplayScale

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 49 of file avf_showspectrum.c.

◆ ColorMode

enum ColorMode

Enumerator
CHANNEL
INTENSITY
RAINBOW
MORELAND
NEBULAE
FIRE
FIERY
FRUIT
COOL
MAGMA
GREEN
VIRIDIS
PLASMA
CIVIDIS
TERRAIN
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 50 of file avf_showspectrum.c.

◆ SlideMode

enum SlideMode

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

Definition at line 51 of file avf_showspectrum.c.

◆ Orientation

enum Orientation

Enumerator
VERTICAL
HORIZONTAL
NB_ORIENTATIONS
VERTICAL
HORIZONTAL
NB_ORIENTATIONS

Definition at line 52 of file avf_showspectrum.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( showspectrum )

◆ uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 300 of file avf_showspectrum.c.

◆ query_formats()

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 346 of file avf_showspectrum.c.

◆ run_channel_fft()

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

static

Definition at line 377 of file avf_showspectrum.c.

◆ drawtext()

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

static

Definition at line 477 of file avf_showspectrum.c.

Referenced by draw_legend(), and plot_spectrum_column().

◆ color_range()

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

static

Definition at line 511 of file avf_showspectrum.c.

Referenced by plot_channel_lin(), and plot_channel_log().

◆ pick_color()

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

static

Definition at line 573 of file avf_showspectrum.c.

Referenced by draw_legend(), plot_channel_lin(), and plot_channel_log().

◆ get_time()

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

static

Definition at line 617 of file avf_showspectrum.c.

Referenced by draw_legend(), and plot_spectrum_column().

◆ log_scale()

static float log_scale	(	const float	value,
		const float	min,
		const float	max
	)

static

Definition at line 632 of file avf_showspectrum.c.

Referenced by get_log_hz().

◆ get_log_hz()

static float get_log_hz	(	const int	bin,
		const int	num_bins,
		const float	sample_rate
	)

static

Definition at line 647 of file avf_showspectrum.c.

Referenced by draw_legend().

◆ inv_log_scale()

static float inv_log_scale	(	const float	value,
		const float	min,
		const float	max
	)

static

Definition at line 657 of file avf_showspectrum.c.

Referenced by bin_pos().

◆ bin_pos()

static float bin_pos	(	const int	bin,
		const int	num_bins,
		const float	sample_rate
	)

static

Definition at line 672 of file avf_showspectrum.c.

Referenced by plot_channel_log().

◆ draw_legend()

static int draw_legend	(	AVFilterContext *	ctx,
		int	samples
	)

static

Definition at line 682 of file avf_showspectrum.c.

Referenced by config_output().

◆ get_value()

static float get_value	(	AVFilterContext *	ctx,
		int	ch,
		int	y
	)

static

Definition at line 873 of file avf_showspectrum.c.

Referenced by plot_channel_lin(), and plot_channel_log().

◆ plot_channel_lin()

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

static

Definition at line 920 of file avf_showspectrum.c.

Referenced by config_output().

◆ plot_channel_log()

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

static

Definition at line 943 of file avf_showspectrum.c.

Referenced by config_output().

◆ config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 977 of file avf_showspectrum.c.

◆ calc_channel_magnitudes()

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

static

Definition at line 1204 of file avf_showspectrum.c.

◆ calc_channel_phases()

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

static

Definition at line 1219 of file avf_showspectrum.c.

◆ acalc_magnitudes()

static void acalc_magnitudes ( ShowSpectrumContext * s )

static

Definition at line 1233 of file avf_showspectrum.c.

◆ scale_magnitudes()

static void scale_magnitudes	(	ShowSpectrumContext *	s,
		float	scale
	)

static

Definition at line 1247 of file avf_showspectrum.c.

◆ clear_combine_buffer()

static void clear_combine_buffer	(	ShowSpectrumContext *	s,
		int	size
	)

static

Definition at line 1259 of file avf_showspectrum.c.

Referenced by plot_spectrum_column().

◆ plot_spectrum_column()

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

static

Definition at line 1270 of file avf_showspectrum.c.

Variable Documentation

◆ showspectrum_options

const AVOption showspectrum_options[]

static

Definition at line 106 of file avf_showspectrum.c.

◆ color_table

const struct ColorTable color_table[][8]

static

Referenced by pick_color().

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ OFFSET

◆ FLAGS

◆ RE

◆ IM

◆ MAGNITUDE

◆ PHASE

Enumeration Type Documentation

◆ DisplayMode

◆ DataMode

◆ FrequencyScale

◆ DisplayScale

◆ ColorMode

◆ SlideMode

◆ Orientation

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ uninit()

◆ query_formats()

◆ run_channel_fft()

◆ drawtext()

◆ color_range()

◆ pick_color()

◆ get_time()

◆ log_scale()

◆ get_log_hz()

◆ inv_log_scale()

◆ bin_pos()

◆ draw_legend()

◆ get_value()

◆ plot_channel_lin()

◆ plot_channel_log()

◆ config_output()

◆ calc_channel_magnitudes()

◆ calc_channel_phases()

◆ acalc_magnitudes()

◆ scale_magnitudes()

◆ clear_combine_buffer()

◆ plot_spectrum_column()

Variable Documentation

◆ showspectrum_options

◆ color_table