af_acrusher.c File Reference

#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "audio.h"

Go to the source code of this file.

Data Structures
struct	LFOContext
struct	SRContext
struct	ACrusherContext

Macros
#define	OFFSET(x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Functions
	AVFILTER_DEFINE_CLASS (acrusher)
static double	samplereduction (ACrusherContext *s, SRContext *sr, double in)
static double	add_dc (double s, double dc, double idc)
static double	remove_dc (double s, double dc, double idc)
static double	factor (double y, double k, double aa1, double aa)
static double	bitreduction (ACrusherContext *s, double in)
static double	lfo_get (LFOContext *lfo)
static void	lfo_advance (LFOContext *lfo, unsigned count)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
static av_cold void	uninit (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)

Variables
static const AVOption	acrusher_options []
static const AVFilterPad	avfilter_af_acrusher_inputs []
const FFFilter	ff_af_acrusher

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(ACrusherContext, x)

Definition at line 71 of file af_acrusher.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 72 of file af_acrusher.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

acrusher

)

samplereduction()

static double samplereduction ( ACrusherContext * s, SRContext * sr, double in )

static

Definition at line 93 of file af_acrusher.c.

Referenced by filter_frame().

add_dc()

static double add_dc ( double s, double dc, double idc )

static

Definition at line 109 of file af_acrusher.c.

Referenced by bitreduction().

remove_dc()

static double remove_dc ( double s, double dc, double idc )

static

Definition at line 114 of file af_acrusher.c.

Referenced by bitreduction().

factor()

static double factor ( double y, double k, double aa1, double aa )

inlinestatic

Definition at line 119 of file af_acrusher.c.

bitreduction()

static double bitreduction ( ACrusherContext * s, double in )

static

Definition at line 124 of file af_acrusher.c.

Referenced by filter_frame().

lfo_get()

static double lfo_get ( LFOContext * lfo )

static

Definition at line 197 of file af_acrusher.c.

Referenced by filter_frame().

lfo_advance()

static void lfo_advance ( LFOContext * lfo, unsigned count )

static

Definition at line 210 of file af_acrusher.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 217 of file af_acrusher.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 267 of file af_acrusher.c.

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 274 of file af_acrusher.c.

Referenced by process_command().

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 307 of file af_acrusher.c.

Referenced by AVFILTER_DEFINE_CLASS_EXT(), and AVFILTER_DEFINE_CLASS_EXT().

Variable Documentation

acrusher_options

const AVOption acrusher_options[]

static

Initial value:

= {
    { "level_in", "set level in",         OFFSET(level_in),  AV_OPT_TYPE_DOUBLE, {.dbl=1},    0.015625, 64, A },
    { "level_out","set level out",        OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1},    0.015625, 64, A },
    { "bits",     "set bit reduction",    OFFSET(bits),      AV_OPT_TYPE_DOUBLE, {.dbl=8},    1,        64, A },
    { "mix",      "set mix",              OFFSET(mix),       AV_OPT_TYPE_DOUBLE, {.dbl=.5},   0,         1, A },
    { "mode",     "set mode",             OFFSET(mode),      AV_OPT_TYPE_INT,    {.i64=0},    0,         1, A, .unit = "mode" },
    {   "lin",    "linear",               0,                 AV_OPT_TYPE_CONST,  {.i64=0},    0,         0, A, .unit = "mode" },
    {   "log",    "logarithmic",          0,                 AV_OPT_TYPE_CONST,  {.i64=1},    0,         0, A, .unit = "mode" },
    { "dc",       "set DC",               OFFSET(dc),        AV_OPT_TYPE_DOUBLE, {.dbl=1},  .25,         4, A },
    { "aa",       "set anti-aliasing",    OFFSET(aa),        AV_OPT_TYPE_DOUBLE, {.dbl=.5},   0,         1, A },
    { "samples",  "set sample reduction", OFFSET(samples),   AV_OPT_TYPE_DOUBLE, {.dbl=1},    1,       250, A },
    { "lfo",      "enable LFO",           OFFSET(is_lfo),    AV_OPT_TYPE_BOOL,   {.i64=0},    0,         1, A },
    { "lforange", "set LFO depth",        OFFSET(lforange),  AV_OPT_TYPE_DOUBLE, {.dbl=20},   1,       250, A },
    { "lforate",  "set LFO rate",         OFFSET(lforate),   AV_OPT_TYPE_DOUBLE, {.dbl=.3}, .01,       200, A },
    { NULL }
}

Definition at line 74 of file af_acrusher.c.

avfilter_af_acrusher_inputs

const AVFilterPad avfilter_af_acrusher_inputs[]

static

Initial value:

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

Definition at line 320 of file af_acrusher.c.

ff_af_acrusher

const FFFilter ff_af_acrusher

Initial value:

= {
    .p.name        = "acrusher",
    .p.description = NULL_IF_CONFIG_SMALL("Reduce audio bit resolution."),
    .p.priv_class  = &acrusher_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
    .priv_size     = sizeof(ACrusherContext),
    .uninit        = uninit,
    FILTER_INPUTS(avfilter_af_acrusher_inputs),
    FILTER_OUTPUTS(ff_audio_default_filterpad),
    FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL),
    .process_command = process_command,
}

Definition at line 329 of file af_acrusher.c.