af_firequalizer.c File Reference

#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"

Go to the source code of this file.

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

Enumerations
enum	WindowFunc {   WFUNC_MIN, WFUNC_RECTANGULAR = WFUNC_MIN, WFUNC_HANN, WFUNC_HAMMING,   WFUNC_BLACKMAN, WFUNC_NUTTALL3, WFUNC_MNUTTALL3, WFUNC_NUTTALL,   WFUNC_BNUTTALL, WFUNC_BHARRIS, WFUNC_MAX = WFUNC_BHARRIS, 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, NB_WFUNC }
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 *s, const float *kernel_buf, float *conv_buf, OverlapIndex *idx, float *data, int nsamples)
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 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

#define RDFT_BITS_MIN   4

Definition at line 29 of file af_firequalizer.c.

Referenced by config_input().

#define RDFT_BITS_MAX   16

Definition at line 30 of file af_firequalizer.c.

Referenced by config_input().

#define NB_GAIN_ENTRY_MAX   4096

Definition at line 46 of file af_firequalizer.c.

Referenced by entry_func().

#define OFFSET

(

x

)

offsetof(FIREqualizerContext, x)

Definition at line 93 of file af_firequalizer.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 94 of file af_firequalizer.c.

Enumeration Type Documentation

enum WindowFunc

Enumerator
WFUNC_MIN
WFUNC_RECTANGULAR
WFUNC_HANN
WFUNC_HAMMING
WFUNC_BLACKMAN
WFUNC_NUTTALL3
WFUNC_MNUTTALL3
WFUNC_NUTTALL
WFUNC_BNUTTALL
WFUNC_BHARRIS
WFUNC_MAX
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
NB_WFUNC

Definition at line 32 of file af_firequalizer.c.

enum VarOffset

Enumerator
VAR_F
VAR_SR
VAR_CH
VAR_CHID
VAR_CHS
VAR_CHLAYOUT
VAR_NB

Definition at line 297 of file af_firequalizer.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

firequalizer

)

static void common_uninit ( FIREqualizerContext *  s )

static

Definition at line 119 of file af_firequalizer.c.

Referenced by config_input(), and uninit().

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 133 of file af_firequalizer.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 142 of file af_firequalizer.c.

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

static

Definition at line 172 of file af_firequalizer.c.

Referenced by filter_frame().

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

static

Definition at line 211 of file af_firequalizer.c.

Referenced by generate_kernel().

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

static

Definition at line 240 of file af_firequalizer.c.

Referenced by gain_interpolate_func().

static double gain_interpolate_func ( void *  p, double  freq  )

static

Definition at line 252 of file af_firequalizer.c.

Referenced by generate_kernel().

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

static

Definition at line 307 of file af_firequalizer.c.

Referenced by config_input(), and process_command().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 425 of file af_firequalizer.c.

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

static

Definition at line 486 of file af_firequalizer.c.

Referenced by request_frame().

static int request_frame ( AVFilterLink *  outlink )

static

Definition at line 508 of file af_firequalizer.c.

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

static

Definition at line 530 of file af_firequalizer.c.

Variable Documentation

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 }, WFUNC_MIN, WFUNC_MAX, 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" },
    { "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 },
    { NULL }
}

Definition at line 96 of file af_firequalizer.c.

const char* const var_names[]

static

Initial value:

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

Definition at line 287 of file af_firequalizer.c.

Referenced by generate_kernel().

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 569 of file af_firequalizer.c.

const AVFilterPad firequalizer_outputs[]

static

Initial value:

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

Definition at line 580 of file af_firequalizer.c.

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 589 of file af_firequalizer.c.