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/xga_font_data.h"
#include "audio.h"
#include "video.h"
#include "avfilter.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) 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 }

enum	ColorMode { CHANNEL, INTENSITY, RAINBOW, MORELAND, NEBULAE, FIRE, FIERY, FRUIT, COOL, 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	config_output (AVFilterLink *outlink)

static void	run_fft (ShowSpectrumContext s, AVFrame fin)

static void	calc_magnitudes (ShowSpectrumContext *s)

static void	calc_phases (ShowSpectrumContext *s)

static void	acalc_magnitudes (ShowSpectrumContext *s)

static void	scale_magnitudes (ShowSpectrumContext *s, float scale)

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 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

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

Definition at line 86 of file avf_showspectrum.c.

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 87 of file avf_showspectrum.c.

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

Definition at line 447 of file avf_showspectrum.c.

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

Definition at line 448 of file avf_showspectrum.c.

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

Definition at line 449 of file avf_showspectrum.c.

Referenced by acalc_magnitudes(), and calc_magnitudes().

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

Definition at line 450 of file avf_showspectrum.c.

Referenced by avfilter_register_all(), and calc_phases().

Enumeration Type Documentation

enum DisplayMode

Enumerator
SINGLE
SEPARATE
NB_DMODES
LINE
BAR
DOT
NB_MODES
COMBINED
SEPARATE
NB_MODES

Definition at line 44 of file avf_showspectrum.c.

enum DataMode

Enumerator
D_MAGNITUDE
D_PHASE
NB_DMODES

Definition at line 45 of file avf_showspectrum.c.

enum DisplayScale

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

Definition at line 46 of file avf_showspectrum.c.

enum ColorMode

Enumerator
CHANNEL
INTENSITY
RAINBOW
MORELAND
NEBULAE
FIRE
FIERY
FRUIT
COOL
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 47 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 48 of file avf_showspectrum.c.

enum Orientation

Enumerator
VERTICAL
HORIZONTAL
NB_ORIENTATIONS
VERTICAL
HORIZONTAL
NB_ORIENTATIONS

Definition at line 49 of file avf_showspectrum.c.

Function Documentation

AVFILTER_DEFINE_CLASS ( showspectrum )

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 220 of file avf_showspectrum.c.

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 247 of file avf_showspectrum.c.

static int config_output ( AVFilterLink * outlink )

static

Definition at line 278 of file avf_showspectrum.c.

static void run_fft	(	ShowSpectrumContext *	s,
		AVFrame *	fin
	)

static

Definition at line 426 of file avf_showspectrum.c.

static void calc_magnitudes ( ShowSpectrumContext * s )

static

Definition at line 452 of file avf_showspectrum.c.

static void calc_phases ( ShowSpectrumContext * s )

static

Definition at line 466 of file avf_showspectrum.c.

static void acalc_magnitudes ( ShowSpectrumContext * s )

static

Definition at line 478 of file avf_showspectrum.c.

static void scale_magnitudes	(	ShowSpectrumContext *	s,
		float	scale
	)

static

Definition at line 492 of file avf_showspectrum.c.

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

static

Definition at line 504 of file avf_showspectrum.c.

Referenced by plot_spectrum_column().

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

static

Definition at line 556 of file avf_showspectrum.c.

Referenced by plot_spectrum_column().

static void clear_combine_buffer	(	ShowSpectrumContext *	s,
		int	size
	)

static

Definition at line 600 of file avf_showspectrum.c.

Referenced by plot_spectrum_column().

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

static

Definition at line 611 of file avf_showspectrum.c.

Variable Documentation

const AVOption showspectrum_options[]

static

Definition at line 89 of file avf_showspectrum.c.

const struct ColorTable color_table[][8]

static

Referenced by ff_get_qtpalette(), pick_color(), rgtc1_block_internal(), and seq_decode_op1().

Data Structures

Macros

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation