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,
    .inputs         = avfilter_af_volume_inputs,
    .outputs        = avfilter_af_volume_outputs,
}

Definition at line 311 of file af_volume.c.

const AVFilterPad avfilter_af_volume_inputs[]

static

Initial value:

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

Definition at line 293 of file af_volume.c.

const AVFilterPad avfilter_af_volume_outputs[]

static

Initial value:

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

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 },
}

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,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 56 of file af_volume.c.

Referenced by init().