af_aemphasis.c File Reference

#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"

Go to the source code of this file.

Data Structures
struct	BiquadCoeffs
struct	BiquadD2
struct	RIAACurve
struct	AudioEmphasisContext

Macros
#define	OFFSET(x)   offsetof(AudioEmphasisContext, x)
#define	FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Functions
	AVFILTER_DEFINE_CLASS (aemphasis)
static double	biquad (BiquadD2 *bq, double in)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static int	query_formats (AVFilterContext *ctx)
static void	set_highshelf_rbj (BiquadD2 *bq, double freq, double q, double peak, double sr)
static void	set_lp_rbj (BiquadD2 *bq, double fc, double q, double sr, double gain)
static double	freq_gain (BiquadCoeffs *c, double freq, double sr)
static int	config_input (AVFilterLink *inlink)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	aemphasis_options []
static const AVFilterPad	avfilter_af_aemphasis_inputs []
static const AVFilterPad	avfilter_af_aemphasis_outputs []
AVFilter	ff_af_aemphasis

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(AudioEmphasisContext, x)

Definition at line 48 of file af_aemphasis.c.

#define FLAGS   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 49 of file af_aemphasis.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

aemphasis

)

static double biquad ( BiquadD2 *  bq, double  in  )

inlinestatic

Definition at line 72 of file af_aemphasis.c.

Referenced by filter_frame().

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

static

Definition at line 84 of file af_aemphasis.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 120 of file af_aemphasis.c.

static void set_highshelf_rbj ( BiquadD2 *  bq, double  freq, double  q, double  peak, double  sr  )

inlinestatic

Definition at line 150 of file af_aemphasis.c.

Referenced by config_input().

static void set_lp_rbj ( BiquadD2 *  bq, double  fc, double  q, double  sr, double  gain  )

inlinestatic

Definition at line 174 of file af_aemphasis.c.

Referenced by config_input().

static double freq_gain ( BiquadCoeffs *  c, double  freq, double  sr  )

static

Definition at line 188 of file af_aemphasis.c.

Referenced by config_input().

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 201 of file af_aemphasis.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 336 of file af_aemphasis.c.

Variable Documentation

const AVOption aemphasis_options[]

static

Initial value:

= {
    { "level_in",      "set input gain", OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, FLAGS },
    { "level_out",    "set output gain", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, FLAGS },
    { "mode",         "set filter mode", OFFSET(mode), AV_OPT_TYPE_INT,   {.i64=0}, 0, 1, FLAGS, "mode" },
    { "reproduction",              NULL,            0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
    { "production",                NULL,            0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
    { "type",         "set filter type", OFFSET(type), AV_OPT_TYPE_INT,   {.i64=4}, 0, 8, FLAGS, "type" },
    { "col",                 "Columbia",            0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "type" },
    { "emi",                      "EMI",            0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "type" },
    { "bsi",              "BSI (78RPM)",            0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, FLAGS, "type" },
    { "riaa",                    "RIAA",            0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, FLAGS, "type" },
    { "cd",         "Compact Disc (CD)",            0, AV_OPT_TYPE_CONST, {.i64=4}, 0, 0, FLAGS, "type" },
    { "50fm",               "50µs (FM)",            0, AV_OPT_TYPE_CONST, {.i64=5}, 0, 0, FLAGS, "type" },
    { "75fm",               "75µs (FM)",            0, AV_OPT_TYPE_CONST, {.i64=6}, 0, 0, FLAGS, "type" },
    { "50kf",            "50µs (FM-KF)",            0, AV_OPT_TYPE_CONST, {.i64=7}, 0, 0, FLAGS, "type" },
    { "75kf",            "75µs (FM-KF)",            0, AV_OPT_TYPE_CONST, {.i64=8}, 0, 0, FLAGS, "type" },
    { NULL }
}

Definition at line 51 of file af_aemphasis.c.

const AVFilterPad avfilter_af_aemphasis_inputs[]

static

Initial value:

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

Definition at line 342 of file af_aemphasis.c.

const AVFilterPad avfilter_af_aemphasis_outputs[]

static

Initial value:

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

Definition at line 352 of file af_aemphasis.c.

AVFilter ff_af_aemphasis

Initial value:

= {
    .name          = "aemphasis",
    .description   = NULL_IF_CONFIG_SMALL("Audio emphasis."),
    .priv_size     = sizeof(AudioEmphasisContext),
    .priv_class    = &aemphasis_class,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = avfilter_af_aemphasis_inputs,
    .outputs       = avfilter_af_aemphasis_outputs,
}

Definition at line 360 of file af_aemphasis.c.