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Data Structures | Macros | Functions | Variables
af_adelay.c File Reference
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "avfilter.h"
#include "audio.h"
#include "internal.h"

Go to the source code of this file.

Data Structures

struct  ChanDelay
 
struct  AudioDelayContext
 

Macros

#define OFFSET(x)   offsetof(AudioDelayContext, x)
 
#define A   AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
 
#define DELAY(name, type, fill)
 

Functions

 AVFILTER_DEFINE_CLASS (adelay)
 
static int query_formats (AVFilterContext *ctx)
 
static int config_input (AVFilterLink *inlink)
 
static int filter_frame (AVFilterLink *inlink, AVFrame *frame)
 
static int request_frame (AVFilterLink *outlink)
 
static av_cold void uninit (AVFilterContext *ctx)
 

Variables

static const AVOption adelay_options []
 
static const AVFilterPad adelay_inputs []
 
static const AVFilterPad adelay_outputs []
 
AVFilter ff_af_adelay
 

Macro Definition Documentation

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

Definition at line 48 of file af_adelay.c.

Definition at line 49 of file af_adelay.c.

#define DELAY (   name,
  type,
  fill 
)
Value:
static void delay_channel_## name ##p(ChanDelay *d, int nb_samples, \
const uint8_t *ssrc, uint8_t *ddst) \
{ \
const type *src = (type *)ssrc; \
type *dst = (type *)ddst; \
type *samples = (type *)d->samples; \
\
while (nb_samples) { \
if (d->delay_index < d->delay) { \
const int len = FFMIN(nb_samples, d->delay - d->delay_index); \
\
memcpy(&samples[d->delay_index], src, len * sizeof(type)); \
memset(dst, fill, len * sizeof(type)); \
d->delay_index += len; \
src += len; \
dst += len; \
nb_samples -= len; \
} else { \
*dst = samples[d->index]; \
samples[d->index] = *src; \
nb_samples--; \
d->index++; \
src++, dst++; \
d->index = d->index >= d->delay ? 0 : d->index; \
} \
} \
}

Definition at line 86 of file af_adelay.c.

Function Documentation

AVFILTER_DEFINE_CLASS ( adelay  )
static int query_formats ( AVFilterContext ctx)
static

Definition at line 58 of file af_adelay.c.

static int config_input ( AVFilterLink inlink)
static

Definition at line 121 of file af_adelay.c.

static int filter_frame ( AVFilterLink inlink,
AVFrame frame 
)
static

Definition at line 181 of file af_adelay.c.

Referenced by request_frame().

static int request_frame ( AVFilterLink outlink)
static

Definition at line 212 of file af_adelay.c.

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 243 of file af_adelay.c.

Variable Documentation

const AVOption adelay_options[]
static
Initial value:
= {
{ "delays", "set list of delays for each channel", OFFSET(delays), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, A },
{ NULL }
}

Definition at line 51 of file af_adelay.c.

const AVFilterPad adelay_inputs[]
static
Initial value:
= {
{
.name = "default",
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
}

Definition at line 253 of file af_adelay.c.

const AVFilterPad adelay_outputs[]
static
Initial value:
= {
{
.name = "default",
.request_frame = request_frame,
},
{ NULL }
}

Definition at line 263 of file af_adelay.c.

AVFilter ff_af_adelay
Initial value:
= {
.name = "adelay",
.description = NULL_IF_CONFIG_SMALL("Delay one or more audio channels."),
.query_formats = query_formats,
.priv_size = sizeof(AudioDelayContext),
.priv_class = &adelay_class,
}

Definition at line 272 of file af_adelay.c.