#include "libavutil/opt.h"
#include "libavutil/eval.h"
#include "libavutil/avassert.h"
#include "libavcodec/avfft.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"

Data Structures
struct	GainEntry

struct	OverlapIndex

struct	FIREqualizerContext

Macros
#define	RDFT_BITS_MIN 4

#define	RDFT_BITS_MAX 16

#define	NB_GAIN_ENTRY_MAX 4096

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

#define	FLAGS AV_OPT_FLAG_AUDIO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM

#define	SELECT_GAIN(s) (s->gain_cmd ? s->gain_cmd : s->gain)

#define	SELECT_GAIN_ENTRY(s) (s->gain_entry_cmd ? s->gain_entry_cmd : s->gain_entry)

Enumerations
enum	WindowFunc { WFUNC_RECTANGULAR, WFUNC_HANN, WFUNC_HAMMING, WFUNC_BLACKMAN, WFUNC_NUTTALL3, WFUNC_MNUTTALL3, WFUNC_NUTTALL, WFUNC_BNUTTALL, WFUNC_BHARRIS, WFUNC_TUKEY, NB_WFUNC, WFUNC_RECT, WFUNC_HANNING, WFUNC_HAMMING, WFUNC_BLACKMAN, WFUNC_BARTLETT, WFUNC_WELCH, WFUNC_FLATTOP, WFUNC_BHARRIS, WFUNC_BNUTTALL, WFUNC_SINE, WFUNC_NUTTALL, WFUNC_BHANN, WFUNC_LANCZOS, WFUNC_GAUSS, WFUNC_TUKEY, WFUNC_DOLPH, WFUNC_CAUCHY, WFUNC_PARZEN, WFUNC_POISSON, NB_WFUNC }

enum	Scale { SCALE_LINLIN, SCALE_LINLOG, SCALE_LOGLIN, SCALE_LOGLOG, NB_SCALE }

enum	VarOffset { VAR_F, VAR_SR, VAR_CH, VAR_CHID, VAR_CHS, VAR_CHLAYOUT, VAR_NB }

Functions
	AVFILTER_DEFINE_CLASS (firequalizer)

static void	common_uninit (FIREqualizerContext *s)

static av_cold void	uninit (AVFilterContext *ctx)

static int	query_formats (AVFilterContext *ctx)

static void	fast_convolute (FIREqualizerContext av_restrict s, const float av_restrict kernel_buf, float av_restrict conv_buf, OverlapIndex av_restrict idx, float *av_restrict data, int nsamples)

static void	fast_convolute_nonlinear (FIREqualizerContext av_restrict s, const float av_restrict kernel_buf, float av_restrict conv_buf, OverlapIndex av_restrict idx, float *av_restrict data, int nsamples)

static void	fast_convolute2 (FIREqualizerContext av_restrict s, const float av_restrict kernel_buf, FFTComplex av_restrict conv_buf, OverlapIndex av_restrict idx, float av_restrict data0, float av_restrict data1, int nsamples)

static void	dump_fir (AVFilterContext ctx, FILE fp, int ch)

static double	entry_func (void *p, double freq, double gain)

static int	gain_entry_compare (const void key, const void memb)

static double	gain_interpolate_func (void *p, double freq)

static double	cubic_interpolate_func (void *p, double freq)

static void	generate_min_phase_kernel (FIREqualizerContext s, float rdft_buf)

static int	generate_kernel (AVFilterContext ctx, const char gain, const char *gain_entry)

static int	config_input (AVFilterLink *inlink)

static int	filter_frame (AVFilterLink inlink, AVFrame frame)

static int	request_frame (AVFilterLink *outlink)

static int	process_command (AVFilterContext ctx, const char cmd, const char args, char res, int res_len, int flags)

Variables
static const AVOption	firequalizer_options []

static const char *const	var_names []

static const AVFilterPad	firequalizer_inputs []

static const AVFilterPad	firequalizer_outputs []

AVFilter	ff_af_firequalizer

Macro Definition Documentation

◆ RDFT_BITS_MIN

#define RDFT_BITS_MIN 4

Definition at line 29 of file af_firequalizer.c.

Referenced by config_input().

◆ RDFT_BITS_MAX

#define RDFT_BITS_MAX 16

Definition at line 30 of file af_firequalizer.c.

Referenced by config_input().

◆ NB_GAIN_ENTRY_MAX

#define NB_GAIN_ENTRY_MAX 4096

Definition at line 54 of file af_firequalizer.c.

Referenced by entry_func().

◆ OFFSET

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

Definition at line 113 of file af_firequalizer.c.

◆ FLAGS

#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 114 of file af_firequalizer.c.

◆ SELECT_GAIN

#define SELECT_GAIN ( s ) (s->gain_cmd ? s->gain_cmd : s->gain)

Definition at line 753 of file af_firequalizer.c.

Referenced by config_input(), and process_command().

◆ SELECT_GAIN_ENTRY

#define SELECT_GAIN_ENTRY ( s ) (s->gain_entry_cmd ? s->gain_entry_cmd : s->gain_entry)

Definition at line 754 of file af_firequalizer.c.

Referenced by config_input(), and process_command().

Enumeration Type Documentation

◆ WindowFunc

enum WindowFunc

Enumerator
WFUNC_RECTANGULAR
WFUNC_HANN
WFUNC_HAMMING
WFUNC_BLACKMAN
WFUNC_NUTTALL3
WFUNC_MNUTTALL3
WFUNC_NUTTALL
WFUNC_BNUTTALL
WFUNC_BHARRIS
WFUNC_TUKEY
NB_WFUNC
WFUNC_RECT
WFUNC_HANNING
WFUNC_HAMMING
WFUNC_BLACKMAN
WFUNC_BARTLETT
WFUNC_WELCH
WFUNC_FLATTOP
WFUNC_BHARRIS
WFUNC_BNUTTALL
WFUNC_SINE
WFUNC_NUTTALL
WFUNC_BHANN
WFUNC_LANCZOS
WFUNC_GAUSS
WFUNC_TUKEY
WFUNC_DOLPH
WFUNC_CAUCHY
WFUNC_PARZEN
WFUNC_POISSON
NB_WFUNC

Definition at line 32 of file af_firequalizer.c.

◆ Scale

enum Scale

Enumerator
SCALE_LINLIN
SCALE_LINLOG
SCALE_LOGLIN
SCALE_LOGLOG
NB_SCALE

Definition at line 46 of file af_firequalizer.c.

◆ VarOffset

enum VarOffset

Enumerator
VAR_F
VAR_SR
VAR_CH
VAR_CHID
VAR_CHS
VAR_CHLAYOUT
VAR_NB

Definition at line 543 of file af_firequalizer.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( firequalizer )

◆ common_uninit()

static void common_uninit ( FIREqualizerContext * s )

static

Definition at line 149 of file af_firequalizer.c.

Referenced by config_input(), and uninit().

◆ uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 172 of file af_firequalizer.c.

◆ query_formats()

static int query_formats ( AVFilterContext * ctx )

static

Definition at line 181 of file af_firequalizer.c.

◆ fast_convolute()

static void fast_convolute	(	FIREqualizerContext *av_restrict	s,
		const float *av_restrict	kernel_buf,
		float *av_restrict	conv_buf,
		OverlapIndex *av_restrict	idx,
		float *av_restrict	data,
		int	nsamples
	)

static

Definition at line 211 of file af_firequalizer.c.

Referenced by filter_frame().

◆ fast_convolute_nonlinear()

static void fast_convolute_nonlinear	(	FIREqualizerContext *av_restrict	s,
		const float *av_restrict	kernel_buf,
		float *av_restrict	conv_buf,
		OverlapIndex *av_restrict	idx,
		float *av_restrict	data,
		int	nsamples
	)

static

Definition at line 249 of file af_firequalizer.c.

Referenced by filter_frame().

◆ fast_convolute2()

static void fast_convolute2	(	FIREqualizerContext *av_restrict	s,
		const float *av_restrict	kernel_buf,
		FFTComplex *av_restrict	conv_buf,
		OverlapIndex *av_restrict	idx,
		float *av_restrict	data0,
		float *av_restrict	data1,
		int	nsamples
	)

static

Definition at line 289 of file af_firequalizer.c.

Referenced by filter_frame().

◆ dump_fir()

static void dump_fir	(	AVFilterContext *	ctx,
		FILE *	fp,
		int	ch
	)

static

Definition at line 353 of file af_firequalizer.c.

Referenced by generate_kernel().

◆ entry_func()

static double entry_func	(	void *	p,
		double	freq,
		double	gain
	)

static

Definition at line 412 of file af_firequalizer.c.

Referenced by generate_kernel().

◆ gain_entry_compare()

static int gain_entry_compare	(	const void *	key,
		const void *	memb
	)

static

Definition at line 441 of file af_firequalizer.c.

Referenced by cubic_interpolate_func(), and gain_interpolate_func().

◆ gain_interpolate_func()

static double gain_interpolate_func	(	void *	p,
		double	freq
	)

static

Definition at line 453 of file af_firequalizer.c.

Referenced by generate_kernel().

◆ cubic_interpolate_func()

static double cubic_interpolate_func	(	void *	p,
		double	freq
	)

static

Definition at line 488 of file af_firequalizer.c.

Referenced by generate_kernel().

◆ generate_min_phase_kernel()

static void generate_min_phase_kernel	(	FIREqualizerContext *	s,
		float *	rdft_buf
	)

static

Definition at line 553 of file af_firequalizer.c.

Referenced by generate_kernel().

◆ generate_kernel()

static int generate_kernel	(	AVFilterContext *	ctx,
		const char *	gain,
		const char *	gain_entry
	)

static

Definition at line 601 of file af_firequalizer.c.

Referenced by config_input(), and process_command().

◆ config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 756 of file af_firequalizer.c.

◆ filter_frame()

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

static

Definition at line 843 of file af_firequalizer.c.

Referenced by request_frame().

◆ request_frame()

static int request_frame ( AVFilterLink * outlink )

static

Definition at line 879 of file af_firequalizer.c.

◆ process_command()

static int process_command	(	AVFilterContext *	ctx,
		const char *	cmd,
		const char *	args,
		char *	res,
		int	res_len,
		int	flags
	)

static

Definition at line 901 of file af_firequalizer.c.

Variable Documentation

◆ firequalizer_options

const AVOption firequalizer_options[]

static

Initial value:

= {
    { "gain", "set gain curve", OFFSET(gain), AV_OPT_TYPE_STRING, { .str = "gain_interpolate(f)" }, 0, 0, FLAGS },
    { "gain_entry", "set gain entry", OFFSET(gain_entry), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
    { "delay", "set delay", OFFSET(delay), AV_OPT_TYPE_DOUBLE, { .dbl = 0.01 }, 0.0, 1e10, FLAGS },
    { "accuracy", "set accuracy", OFFSET(accuracy), AV_OPT_TYPE_DOUBLE, { .dbl = 5.0 }, 0.0, 1e10, FLAGS },
    { "wfunc", "set window function", OFFSET(wfunc), AV_OPT_TYPE_INT, { .i64 = WFUNC_HANN }, 0, NB_WFUNC-1, FLAGS, "wfunc" },
        { "rectangular", "rectangular window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_RECTANGULAR }, 0, 0, FLAGS, "wfunc" },
        { "hann", "hann window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_HANN }, 0, 0, FLAGS, "wfunc" },
        { "hamming", "hamming window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_HAMMING }, 0, 0, FLAGS, "wfunc" },
        { "blackman", "blackman window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_BLACKMAN }, 0, 0, FLAGS, "wfunc" },
        { "nuttall3", "3-term nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_NUTTALL3 }, 0, 0, FLAGS, "wfunc" },
        { "mnuttall3", "minimum 3-term nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_MNUTTALL3 }, 0, 0, FLAGS, "wfunc" },
        { "nuttall", "nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_NUTTALL }, 0, 0, FLAGS, "wfunc" },
        { "bnuttall", "blackman-nuttall window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_BNUTTALL }, 0, 0, FLAGS, "wfunc" },
        { "bharris", "blackman-harris window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_BHARRIS }, 0, 0, FLAGS, "wfunc" },
        { "tukey", "tukey window", 0, AV_OPT_TYPE_CONST, { .i64 = WFUNC_TUKEY }, 0, 0, FLAGS, "wfunc" },
    { "fixed", "set fixed frame samples", OFFSET(fixed), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
    { "multi", "set multi channels mode", OFFSET(multi), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
    { "zero_phase", "set zero phase mode", OFFSET(zero_phase), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
    { "scale", "set gain scale", OFFSET(scale), AV_OPT_TYPE_INT, { .i64 = SCALE_LINLOG }, 0, NB_SCALE-1, FLAGS, "scale" },
        { "linlin", "linear-freq linear-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LINLIN }, 0, 0, FLAGS, "scale" },
        { "linlog", "linear-freq logarithmic-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LINLOG }, 0, 0, FLAGS, "scale" },
        { "loglin", "logarithmic-freq linear-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LOGLIN }, 0, 0, FLAGS, "scale" },
        { "loglog", "logarithmic-freq logarithmic-gain", 0, AV_OPT_TYPE_CONST, { .i64 = SCALE_LOGLOG }, 0, 0, FLAGS, "scale" },
    { "dumpfile", "set dump file", OFFSET(dumpfile), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
    { "dumpscale", "set dump scale", OFFSET(dumpscale), AV_OPT_TYPE_INT, { .i64 = SCALE_LINLOG }, 0, NB_SCALE-1, FLAGS, "scale" },
    { "fft2", "set 2-channels fft", OFFSET(fft2), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
    { "min_phase", "set minimum phase mode", OFFSET(min_phase), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
    { NULL }
}

Definition at line 116 of file af_firequalizer.c.

◆ var_names

const char* const var_names[]

static

Initial value:

= {
    "f",
    "sr",
    "ch",
    "chid",
    "chs",
    "chlayout",
    NULL
}

Definition at line 533 of file af_firequalizer.c.

Referenced by generate_kernel().

◆ firequalizer_inputs

const AVFilterPad firequalizer_inputs[]

static

Initial value:

= {
    {
        .name           = "default",
        .config_props   = config_input,
        .filter_frame   = filter_frame,
        .type           = AVMEDIA_TYPE_AUDIO,
        .needs_writable = 1,
    },
    { NULL }
}

Definition at line 950 of file af_firequalizer.c.

◆ firequalizer_outputs

const AVFilterPad firequalizer_outputs[]

static

Initial value:

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

Definition at line 961 of file af_firequalizer.c.

◆ ff_af_firequalizer

AVFilter ff_af_firequalizer

Initial value:

= {
    .name               = "firequalizer",
    .description        = NULL_IF_CONFIG_SMALL("Finite Impulse Response Equalizer."),
    .uninit             = uninit,
    .query_formats      = query_formats,
    .process_command    = process_command,
    .priv_size          = sizeof(FIREqualizerContext),
    .inputs             = firequalizer_inputs,
    .outputs            = firequalizer_outputs,
    .priv_class         = &firequalizer_class,
}

Definition at line 970 of file af_firequalizer.c.

Data Structures

Macros

Enumerations

Functions

Variables

Macro Definition Documentation

◆ RDFT_BITS_MIN

◆ RDFT_BITS_MAX

◆ NB_GAIN_ENTRY_MAX

◆ OFFSET

◆ FLAGS

◆ SELECT_GAIN

◆ SELECT_GAIN_ENTRY

Enumeration Type Documentation

◆ WindowFunc

◆ Scale

◆ VarOffset

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ common_uninit()

◆ uninit()

◆ query_formats()

◆ fast_convolute()

◆ fast_convolute_nonlinear()

◆ fast_convolute2()

◆ dump_fir()

◆ entry_func()

◆ gain_entry_compare()

◆ gain_interpolate_func()

◆ cubic_interpolate_func()

◆ generate_min_phase_kernel()

◆ generate_kernel()

◆ config_input()

◆ filter_frame()

◆ request_frame()

◆ process_command()

Variable Documentation

◆ firequalizer_options

◆ var_names

◆ firequalizer_inputs

◆ firequalizer_outputs

◆ ff_af_firequalizer