af_volume.c File Reference

audio volume filter More...

#include "libavutil/audioconvert.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/float_dsp.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "af_volume.h"

Go to the source code of this file.

Macros

#define OFFSET(x)   offsetof(VolumeContext, x)
 
#define A   AV_OPT_FLAG_AUDIO_PARAM
 

Functions

static av_cold int init (AVFilterContext *ctx, const char *args)
 
static int query_formats (AVFilterContext *ctx)
 
static void scale_samples_u8 (uint8_t *dst, const uint8_t *src, int nb_samples, int volume)
 
static void scale_samples_u8_small (uint8_t *dst, const uint8_t *src, int nb_samples, int volume)
 
static void scale_samples_s16 (uint8_t *dst, const uint8_t *src, int nb_samples, int volume)
 
static void scale_samples_s16_small (uint8_t *dst, const uint8_t *src, int nb_samples, int volume)
 
static void scale_samples_s32 (uint8_t *dst, const uint8_t *src, int nb_samples, int volume)
 
static void volume_init (VolumeContext *vol)
 
static int config_output (AVFilterLink *outlink)
 
static int filter_frame (AVFilterLink *inlink, AVFilterBufferRef *buf)
 

Variables

static const char * precision_str []
 
static const AVOption options []
 
static const AVClass volume_class
 
static const AVFilterPad avfilter_af_volume_inputs []
 
static const AVFilterPad avfilter_af_volume_outputs []
 
AVFilter avfilter_af_volume
 

Detailed Description

audio volume filter

Definition in file af_volume.c.

Macro Definition Documentation

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 43 of file af_volume.c.

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

Definition at line 42 of file af_volume.c.

Function Documentation

static int config_output ( AVFilterLink outlink)
static

Definition at line 221 of file af_volume.c.

static int filter_frame ( AVFilterLink inlink,
AVFilterBufferRef buf 
)
static

Definition at line 236 of file af_volume.c.

static av_cold int init ( AVFilterContext ctx,
const char *  args 
)
static

Definition at line 63 of file af_volume.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 91 of file af_volume.c.

static void scale_samples_s16 ( uint8_t dst,
const uint8_t src,
int  nb_samples,
int  volume 
)
inlinestatic

Definition at line 155 of file af_volume.c.

Referenced by volume_init().

static void scale_samples_s16_small ( uint8_t dst,
const uint8_t src,
int  nb_samples,
int  volume 
)
inlinestatic

Definition at line 165 of file af_volume.c.

Referenced by volume_init().

static void scale_samples_s32 ( uint8_t dst,
const uint8_t src,
int  nb_samples,
int  volume 
)
inlinestatic

Definition at line 175 of file af_volume.c.

Referenced by volume_init().

static void scale_samples_u8 ( uint8_t dst,
const uint8_t src,
int  nb_samples,
int  volume 
)
inlinestatic

Definition at line 139 of file af_volume.c.

Referenced by volume_init().

static void scale_samples_u8_small ( uint8_t dst,
const uint8_t src,
int  nb_samples,
int  volume 
)
inlinestatic

Definition at line 147 of file af_volume.c.

Referenced by volume_init().

static void volume_init ( VolumeContext vol)
static

Definition at line 187 of file af_volume.c.

Referenced by config_output().

Variable Documentation

AVFilter avfilter_af_volume
Initial value:
= {
.name = "volume",
.description = NULL_IF_CONFIG_SMALL("Change input volume."),
.query_formats = query_formats,
.priv_size = sizeof(VolumeContext),
.init = init,
}
static av_cold int init(AVFilterContext *ctx, const char *args)
Definition: af_volume.c:63
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:122
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:88
static int query_formats(AVFilterContext *ctx)
Definition: af_volume.c:91
static const AVFilterPad avfilter_af_volume_outputs[]
Definition: af_volume.c:302
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:110
static const AVFilterPad avfilter_af_volume_inputs[]
Definition: af_volume.c:293
struct VolumeContext VolumeContext

Definition at line 311 of file af_volume.c.

const AVFilterPad avfilter_af_volume_inputs[]
static
Initial value:
= {
{
.name = "default",
.filter_frame = filter_frame,
},
{ NULL }
}
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *buf)
Definition: af_volume.c:236
NULL
Definition: eval.c:52

Definition at line 293 of file af_volume.c.

const AVFilterPad avfilter_af_volume_outputs[]
static
Initial value:
= {
{
.name = "default",
.config_props = config_output,
},
{ NULL }
}
NULL
Definition: eval.c:52
static int config_output(AVFilterLink *outlink)
Definition: af_volume.c:221

Definition at line 302 of file af_volume.c.

const AVOption options[]
static
Initial value:
= {
{ "volume", "Volume adjustment.",
OFFSET(volume), AV_OPT_TYPE_DOUBLE, { .dbl = 1.0 }, 0, 0x7fffff, A },
{ "precision", "Mathematical precision.",
OFFSET(precision), AV_OPT_TYPE_INT, { .i64 = PRECISION_FLOAT }, PRECISION_FIXED, PRECISION_DOUBLE, A, "precision" },
{ "fixed", "8-bit fixed-point.", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FIXED }, INT_MIN, INT_MAX, A, "precision" },
{ "float", "32-bit floating-point.", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FLOAT }, INT_MIN, INT_MAX, A, "precision" },
{ "double", "64-bit floating-point.", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_DOUBLE }, INT_MIN, INT_MAX, A, "precision" },
{ NULL },
}
#define A
Definition: af_volume.c:43
NULL
Definition: eval.c:52
#define OFFSET(x)
Definition: af_volume.c:42

Definition at line 45 of file af_volume.c.

const char* precision_str[]
static
Initial value:
= {
"fixed", "float", "double"
}

Definition at line 38 of file af_volume.c.

Referenced by init().

const AVClass volume_class
static
Initial value:
= {
.class_name = "volume filter",
.item_name = av_default_item_name,
.option = options,
}
static const AVOption options[]
Definition: af_volume.c:45
LIBAVUTIL_VERSION_INT
Definition: eval.c:52
av_default_item_name
Definition: dnxhdenc.c:43

Definition at line 56 of file af_volume.c.

Referenced by init().