vf_pad.c File Reference

video padding filter More...

#include <float.h>
#include "avfilter.h"
#include "filters.h"
#include "formats.h"
#include "video.h"
#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/pixdesc.h"
#include "libavutil/colorspace.h"
#include "libavutil/imgutils.h"
#include "libavutil/parseutils.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "drawutils.h"

Go to the source code of this file.

Data Structures
struct	PadContext

Macros
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Enumerations
enum	var_name {   VAR_IN_W , VAR_IW , VAR_IN_H , VAR_IH ,   VAR_OUT_W , VAR_OW , VAR_OUT_H , VAR_OH ,   VAR_X , VAR_Y , VAR_A , VAR_SAR ,   VAR_DAR , VAR_HSUB , VAR_VSUB , VARS_NB }
enum	EvalMode { EVAL_MODE_INIT , EVAL_MODE_FRAME , EVAL_MODE_NB }

Functions
static int	query_formats (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
static int	config_input (AVFilterLink *inlink)
static int	config_output (AVFilterLink *outlink)
static AVFrame *	get_video_buffer (AVFilterLink *inlink, int w, int h)
static int	buffer_needs_copy (PadContext *s, AVFrame *frame, AVBufferRef *buf)
static int	frame_needs_copy (PadContext *s, AVFrame *frame)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)
	AVFILTER_DEFINE_CLASS (pad)

Variables
static const char *const	var_names []
static const AVOption	pad_options []
static const AVFilterPad	avfilter_vf_pad_inputs []
static const AVFilterPad	avfilter_vf_pad_outputs []
const FFFilter	ff_vf_pad

Detailed Description

video padding filter

Definition in file vf_pad.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(PadContext, x)

Definition at line 423 of file vf_pad.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 424 of file vf_pad.c.

Enumeration Type Documentation

var_name

enum var_name

Enumerator
VAR_IN_W
VAR_IW
VAR_IN_H
VAR_IH
VAR_OUT_W
VAR_OW
VAR_OUT_H
VAR_OH
VAR_X
VAR_Y
VAR_A
VAR_SAR
VAR_DAR
VAR_HSUB
VAR_VSUB
VARS_NB

Definition at line 60 of file vf_pad.c.

EvalMode

enum EvalMode

Enumerator
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB

Definition at line 83 of file vf_pad.c.

Function Documentation

query_formats()

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

static

Definition at line 75 of file vf_pad.c.

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 108 of file vf_pad.c.

Referenced by filter_frame().

config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 226 of file vf_pad.c.

Referenced by filter_frame().

get_video_buffer()

static AVFrame * get_video_buffer ( AVFilterLink * inlink, int w, int h )

static

Definition at line 235 of file vf_pad.c.

buffer_needs_copy()

static int buffer_needs_copy ( PadContext * s, AVFrame * frame, AVBufferRef * buf )

static

Definition at line 265 of file vf_pad.c.

Referenced by frame_needs_copy().

frame_needs_copy()

static int frame_needs_copy ( PadContext * s, AVFrame * frame )

static

Definition at line 317 of file vf_pad.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 330 of file vf_pad.c.

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

pad

)

Variable Documentation

var_names

const char* const var_names[]

static

Initial value:

= {
    "in_w",   "iw",
    "in_h",   "ih",
    "out_w",  "ow",
    "out_h",  "oh",
    "x",
    "y",
    "a",
    "sar",
    "dar",
    "hsub",
    "vsub",
    NULL
}

Definition at line 45 of file vf_pad.c.

pad_options

const AVOption pad_options[]

static

Initial value:

= {
    { "width",  "set the pad area width expression",       OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
    { "w",      "set the pad area width expression",       OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, 0, 0, FLAGS },
    { "height", "set the pad area height expression",      OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
    { "h",      "set the pad area height expression",      OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, 0, 0, FLAGS },
    { "x",      "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
    { "y",      "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, 0, 0, FLAGS },
    { "color",  "set the color of the padded area border", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str = "black"}, .flags = FLAGS },
    { "eval",   "specify when to evaluate expressions",    OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, .unit = "eval" },
         { "init",  "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT},  .flags = FLAGS, .unit = "eval" },
         { "frame", "eval expressions during initialization and per-frame", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
    { "aspect",  "pad to fit an aspect instead of a resolution", OFFSET(aspect), AV_OPT_TYPE_RATIONAL, {.dbl = 0}, 0, DBL_MAX, FLAGS },
    { NULL }
}

Definition at line 426 of file vf_pad.c.

avfilter_vf_pad_inputs

const AVFilterPad avfilter_vf_pad_inputs[]

static

Initial value:

= {
    {
        .name             = "default",
        .type             = AVMEDIA_TYPE_VIDEO,
        .config_props     = config_input,
        .get_buffer.video = get_video_buffer,
        .filter_frame     = filter_frame,
    },
}

Definition at line 443 of file vf_pad.c.

avfilter_vf_pad_outputs

const AVFilterPad avfilter_vf_pad_outputs[]

static

Initial value:

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

Definition at line 453 of file vf_pad.c.

ff_vf_pad

const FFFilter ff_vf_pad

Initial value:

= {
    .p.name        = "pad",
    .p.description = NULL_IF_CONFIG_SMALL("Pad the input video."),
    .p.priv_class  = &pad_class,
    .priv_size     = sizeof(PadContext),
    FILTER_INPUTS(avfilter_vf_pad_inputs),
    FILTER_OUTPUTS(avfilter_vf_pad_outputs),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 461 of file vf_pad.c.