avf_showfreqs.c File Reference

#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/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "audio.h"
#include "video.h"
#include "avfilter.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	ShowFreqsContext

Macros
#define	OFFSET(x)   offsetof(ShowFreqsContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	RE(x, ch)   s->fft_data[ch][x].re
#define	IM(x, ch)   s->fft_data[ch][x].im
#define	M(a, b)   (sqrt((a) * (a) + (b) * (b)))

Enumerations
enum	DisplayMode {   LINE, BAR, DOT, NB_MODES,   COMBINED, SEPARATE, NB_MODES }
enum	FrequencyScale { FS_LINEAR, FS_LOG, FS_RLOG, NB_FSCALES }
enum	AmplitudeScale {   AS_LINEAR, AS_SQRT, AS_CBRT, AS_LOG,   NB_ASCALES }
enum	WindowFunc {   WFUNC_RECT, WFUNC_HANNING, WFUNC_HAMMING, WFUNC_BLACKMAN,   WFUNC_BARTLETT, WFUNC_WELCH, WFUNC_FLATTOP, WFUNC_BHARRIS,   WFUNC_BNUTTALL, WFUNC_SINE, WFUNC_NUTTALL, WFUNC_BHANN,   NB_WFUNC, WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING,   WFUNC_BLACKMAN, NB_WFUNC }

Functions
	AVFILTER_DEFINE_CLASS (showfreqs)
static int	query_formats (AVFilterContext *ctx)
static void	generate_window_func (float *lut, int N, int win_func, float *overlap)
static int	config_output (AVFilterLink *outlink)
static void	draw_dot (AVFrame *out, int x, int y, uint8_t fg[4])
static int	get_sx (ShowFreqsContext *s, int f)
static float	get_bsize (ShowFreqsContext *s, int f)
static void	plot_freq (ShowFreqsContext *s, int ch, double a, int f, uint8_t fg[4], int *prev_y, AVFrame *out, AVFilterLink *outlink)
static int	plot_freqs (AVFilterLink *inlink, AVFrame *in)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	showfreqs_options []
static const AVFilterPad	showfreqs_inputs []
static const AVFilterPad	showfreqs_outputs []
AVFilter	ff_avf_showfreqs

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(ShowFreqsContext, x)

Definition at line 67 of file avf_showfreqs.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 68 of file avf_showfreqs.c.

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

Referenced by plot_freqs().

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

Referenced by plot_freqs().

#define M	(		a,
			b
	)		(sqrt((a) * (a) + (b) * (b)))

Referenced by plot_freqs().

Enumeration Type Documentation

enum DisplayMode

Enumerator
LINE
BAR
DOT
NB_MODES
COMBINED
SEPARATE
NB_MODES

Definition at line 36 of file avf_showfreqs.c.

enum FrequencyScale

Enumerator
FS_LINEAR
FS_LOG
FS_RLOG
NB_FSCALES

Definition at line 37 of file avf_showfreqs.c.

enum AmplitudeScale

Enumerator
AS_LINEAR
AS_SQRT
AS_CBRT
AS_LOG
NB_ASCALES

Definition at line 38 of file avf_showfreqs.c.

enum WindowFunc

Enumerator
WFUNC_RECT
WFUNC_HANNING
WFUNC_HAMMING
WFUNC_BLACKMAN
WFUNC_BARTLETT
WFUNC_WELCH
WFUNC_FLATTOP
WFUNC_BHARRIS
WFUNC_BNUTTALL
WFUNC_SINE
WFUNC_NUTTALL
WFUNC_BHANN
NB_WFUNC
WFUNC_NONE
WFUNC_HANN
WFUNC_HAMMING
WFUNC_BLACKMAN
NB_WFUNC

Definition at line 39 of file avf_showfreqs.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

showfreqs

)

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 121 of file avf_showfreqs.c.

static void generate_window_func ( float *  lut, int  N, int  win_func, float *  overlap  )

static

Definition at line 155 of file avf_showfreqs.c.

Referenced by config_output().

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 229 of file avf_showfreqs.c.

static void draw_dot ( AVFrame *  out, int  x, int  y, uint8_t  fg[4]  )

inlinestatic

Definition at line 302 of file avf_showfreqs.c.

Referenced by plot_freq().

static int get_sx ( ShowFreqsContext *  s, int  f  )

static

Definition at line 313 of file avf_showfreqs.c.

Referenced by plot_freq().

static float get_bsize ( ShowFreqsContext *  s, int  f  )

static

Definition at line 327 of file avf_showfreqs.c.

Referenced by plot_freq().

static void plot_freq ( ShowFreqsContext *  s, int  ch, double  a, int  f, uint8_t  fg[4], int *  prev_y, AVFrame *  out, AVFilterLink *  outlink  )

inlinestatic

Definition at line 343 of file avf_showfreqs.c.

Referenced by plot_freqs().

static int plot_freqs ( AVFilterLink *  inlink, AVFrame *  in  )

static

Definition at line 413 of file avf_showfreqs.c.

Referenced by filter_frame().

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

static

Definition at line 484 of file avf_showfreqs.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 518 of file avf_showfreqs.c.

Variable Documentation

const AVOption showfreqs_options[]

static

Definition at line 70 of file avf_showfreqs.c.

const AVFilterPad showfreqs_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_AUDIO,
        .filter_frame = filter_frame,
    },
    { NULL }
}

Definition at line 534 of file avf_showfreqs.c.

const AVFilterPad showfreqs_outputs[]

static

Initial value:

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

Definition at line 543 of file avf_showfreqs.c.

AVFilter ff_avf_showfreqs

Initial value:

= {
    .name          = "showfreqs",
    .description   = NULL_IF_CONFIG_SMALL("Convert input audio to a frequencies video output."),
    .uninit        = uninit,
    .query_formats = query_formats,
    .priv_size     = sizeof(ShowFreqsContext),
    .inputs        = showfreqs_inputs,
    .outputs       = showfreqs_outputs,
    .priv_class    = &showfreqs_class,
}

Definition at line 552 of file avf_showfreqs.c.