af_volume.c File Reference

audio volume filter More...

#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/ffmath.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/replaygain.h"
#include "audio.h"
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "af_volume.h"

Go to the source code of this file.

Macros
#define	OFFSET(x)
#define	A   AV_OPT_FLAG_AUDIO_PARAM
#define	F   AV_OPT_FLAG_FILTERING_PARAM
#define	T   AV_OPT_FLAG_RUNTIME_PARAM

Functions
	AVFILTER_DEFINE_CLASS (volume)
static int	set_expr (AVExpr **pexpr, const char *expr, void *log_ctx)
static av_cold int	init (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
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 av_cold void	volume_init (VolumeContext *vol)
static int	set_volume (AVFilterContext *ctx)
static int	config_output (AVFilterLink *outlink)
static int	process_command (AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
static int	filter_frame (AVFilterLink *inlink, AVFrame *buf)

Variables
static const char *const	precision_str []
static const char *const	var_names []
static const AVOption	volume_options []
static const AVFilterPad	avfilter_af_volume_inputs []
static const AVFilterPad	avfilter_af_volume_outputs []
const FFFilter	ff_af_volume

Detailed Description

audio volume filter

Definition in file af_volume.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(VolumeContext, x)

Definition at line 61 of file af_volume.c.

A

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 62 of file af_volume.c.

F

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 63 of file af_volume.c.

T

#define T   AV_OPT_FLAG_RUNTIME_PARAM

Definition at line 64 of file af_volume.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

volume

)

set_expr()

static int set_expr ( AVExpr ** pexpr, const char * expr, void * log_ctx )

static

Definition at line 92 of file af_volume.c.

Referenced by config_input_overlay(), config_input_overlay(), init(), init(), initialize(), and process_command().

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 112 of file af_volume.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 123 of file af_volume.c.

query_formats()

static int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 130 of file af_volume.c.

scale_samples_u8()

static void scale_samples_u8 ( 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().

scale_samples_u8_small()

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

inlinestatic

Definition at line 173 of file af_volume.c.

Referenced by volume_init().

scale_samples_s16()

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

inlinestatic

Definition at line 181 of file af_volume.c.

Referenced by volume_init().

scale_samples_s16_small()

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

inlinestatic

Definition at line 191 of file af_volume.c.

Referenced by volume_init().

scale_samples_s32()

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

inlinestatic

Definition at line 201 of file af_volume.c.

Referenced by volume_init().

volume_init()

static av_cold void volume_init ( VolumeContext * vol )

static

Definition at line 211 of file af_volume.c.

Referenced by filter_frame(), and set_volume().

set_volume()

static int set_volume ( AVFilterContext * ctx )

static

Definition at line 244 of file af_volume.c.

Referenced by config_output(), filter_frame(), and process_command().

config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 276 of file af_volume.c.

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_volume.c.

filter_frame()

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

static

Definition at line 323 of file af_volume.c.

Variable Documentation

precision_str

const char* const precision_str[]

static

Initial value:

= {
    "fixed", "float", "double"
}

Definition at line 42 of file af_volume.c.

Referenced by set_volume().

var_names

const char* const var_names[]

static

Initial value:

= {
    "n",                   
    "nb_channels",         
    "nb_consumed_samples", 
    "nb_samples",          
    "pts",                 
    "sample_rate",         
    "startpts",            
    "startt",              
    "t",                   
    "tb",                  
    "volume",              
    NULL
}

Definition at line 46 of file af_volume.c.

volume_options

const AVOption volume_options[]

static

Initial value:

= {
    { "volume", "set volume adjustment expression",
            OFFSET(volume_expr), AV_OPT_TYPE_STRING, { .str = "1.0" }, .flags = A|F|T },
    { "precision", "select mathematical precision",
            OFFSET(precision), AV_OPT_TYPE_INT, { .i64 = PRECISION_FLOAT }, PRECISION_FIXED, PRECISION_DOUBLE, A|F, .unit = "precision" },
        { "fixed",  "select 8-bit fixed-point",     0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FIXED  }, INT_MIN, INT_MAX, A|F, .unit = "precision" },
        { "float",  "select 32-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_FLOAT  }, INT_MIN, INT_MAX, A|F, .unit = "precision" },
        { "double", "select 64-bit floating-point", 0, AV_OPT_TYPE_CONST, { .i64 = PRECISION_DOUBLE }, INT_MIN, INT_MAX, A|F, .unit = "precision" },
    { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_ONCE}, 0, EVAL_MODE_NB-1, .flags = A|F, .unit = "eval" },
         { "once",  "eval volume expression once", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_ONCE},  .flags = A|F, .unit = "eval" },
         { "frame", "eval volume expression per-frame",                  0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = A|F, .unit = "eval" },
    { "replaygain", "Apply replaygain side data when present",
            OFFSET(replaygain), AV_OPT_TYPE_INT, { .i64 = REPLAYGAIN_DROP }, REPLAYGAIN_DROP, REPLAYGAIN_ALBUM, A|F, .unit = "replaygain" },
        { "drop",   "replaygain side data is dropped", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_DROP   }, 0, 0, A|F, .unit = "replaygain" },
        { "ignore", "replaygain side data is ignored", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_IGNORE }, 0, 0, A|F, .unit = "replaygain" },
        { "track",  "track gain is preferred",         0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_TRACK  }, 0, 0, A|F, .unit = "replaygain" },
        { "album",  "album gain is preferred",         0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_ALBUM  }, 0, 0, A|F, .unit = "replaygain" },
    { "replaygain_preamp", "Apply replaygain pre-amplification",
            OFFSET(replaygain_preamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.0 }, -15.0, 15.0, A|F },
    { "replaygain_noclip", "Apply replaygain clipping prevention",
            OFFSET(replaygain_noclip), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, A|F },
    { NULL }
}

Definition at line 66 of file af_volume.c.

avfilter_af_volume_inputs

const AVFilterPad avfilter_af_volume_inputs[]

static

Initial value:

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

Definition at line 443 of file af_volume.c.

avfilter_af_volume_outputs

const AVFilterPad avfilter_af_volume_outputs[]

static

Initial value:

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

Definition at line 451 of file af_volume.c.

ff_af_volume

const FFFilter ff_af_volume

Initial value:

= {
    .p.name         = "volume",
    .p.description  = NULL_IF_CONFIG_SMALL("Change input volume."),
    .p.priv_class   = &volume_class,
    .p.flags        = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
    .priv_size      = sizeof(VolumeContext),
    .init           = init,
    .uninit         = uninit,
    FILTER_INPUTS(avfilter_af_volume_inputs),
    FILTER_OUTPUTS(avfilter_af_volume_outputs),
    FILTER_QUERY_FUNC2(query_formats),
    .process_command = process_command,
}

Definition at line 459 of file af_volume.c.