vf_delogo.c File Reference

A very simple tv station logo remover Originally imported from MPlayer libmpcodecs/vf_delogo.c, the algorithm was later improved. More...

#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/eval.h"
#include "avfilter.h"
#include "filters.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	DelogoContext

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

Enumerations
enum	var_name {   VAR_X , VAR_Y , VAR_W , VAR_H ,   VAR_N , VAR_T , VAR_VARS_NB }

Functions
static int	set_expr (AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
static void	apply_delogo (uint8_t *dst, int dst_linesize, uint8_t *src, int src_linesize, int w, int h, AVRational sar, int logo_x, int logo_y, int logo_w, int logo_h, unsigned int band, int show, int direct)
	Apply a simple delogo algorithm to the image in src and put the result in dst.
	AVFILTER_DEFINE_CLASS (delogo)
static av_cold void	uninit (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	filter_frame (AVFilterLink *inlink, AVFrame *in)

Variables
static const char *const	var_names []
static const AVOption	delogo_options []
static enum AVPixelFormat	pix_fmts []
static const AVFilterPad	avfilter_vf_delogo_inputs []
const FFFilter	ff_vf_delogo

Detailed Description

A very simple tv station logo remover Originally imported from MPlayer libmpcodecs/vf_delogo.c, the algorithm was later improved.

Definition in file vf_delogo.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(DelogoContext, x)

Definition at line 204 of file vf_delogo.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 205 of file vf_delogo.c.

CHECK_UNSET_OPT

#define CHECK_UNSET_OPT

(

opt

)

Value:

    if (s->opt == -1) {                                                 \
        av_log(ctx, AV_LOG_ERROR, "Option %s was not set.\n", #opt);    \
        return AVERROR(EINVAL);                                         \
    }

Referenced by init().

Enumeration Type Documentation

var_name

enum var_name

Enumerator
VAR_X
VAR_Y
VAR_W
VAR_H
VAR_N
VAR_T
VAR_VARS_NB

Definition at line 48 of file vf_delogo.c.

Function Documentation

set_expr()

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

static

Definition at line 58 of file vf_delogo.c.

Referenced by init().

apply_delogo()

static void apply_delogo ( uint8_t * dst, int dst_linesize, uint8_t * src, int src_linesize, int w, int h, AVRational sar, int logo_x, int logo_y, int logo_w, int logo_h, unsigned int band, int show, int direct )

static

Apply a simple delogo algorithm to the image in src and put the result in dst.

The algorithm is only applied to the region specified by the logo parameters.

Parameters

w	width of the input image
h	height of the input image
logo_x	x coordinate of the top left corner of the logo region
logo_y	y coordinate of the top left corner of the logo region
logo_w	width of the logo
logo_h	height of the logo
band	the size of the band around the processed area
show	show a rectangle around the processed area, useful for parameters tweaking
direct	if non-zero perform in-place processing

Definition at line 97 of file vf_delogo.c.

Referenced by filter_frame().

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

delogo

)

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 217 of file vf_delogo.c.

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 234 of file vf_delogo.c.

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 273 of file vf_delogo.c.

Referenced by filter_frame().

filter_frame()

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

static

Definition at line 288 of file vf_delogo.c.

Variable Documentation

var_names

const char* const var_names[]

static

Initial value:

= {
    "x",
    "y",
    "w",
    "h",
    "n",            
    "t",            
    NULL
}

Definition at line 38 of file vf_delogo.c.

delogo_options

const AVOption delogo_options[]

static

Initial value:

= {
    { "x",    "set logo x position",       OFFSET(x_expr),    AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
    { "y",    "set logo y position",       OFFSET(y_expr),    AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
    { "w",    "set logo width",            OFFSET(w_expr),    AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
    { "h",    "set logo height",           OFFSET(h_expr),    AV_OPT_TYPE_STRING, { .str = "-1" }, 0, 0, FLAGS },
    { "show", "show delogo area",          OFFSET(show),      AV_OPT_TYPE_BOOL,   { .i64 =  0 },   0, 1, FLAGS },
    { NULL }
}

Definition at line 207 of file vf_delogo.c.

pix_fmts

enum AVPixelFormat pix_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
    AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,
    AV_PIX_FMT_YUVA420P, AV_PIX_FMT_GRAY8,
    AV_PIX_FMT_NONE
}

Definition at line 227 of file vf_delogo.c.

avfilter_vf_delogo_inputs

const AVFilterPad avfilter_vf_delogo_inputs[]

static

Initial value:

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

Definition at line 377 of file vf_delogo.c.

ff_vf_delogo

const FFFilter ff_vf_delogo

Initial value:

= {
    .p.name        = "delogo",
    .p.description = NULL_IF_CONFIG_SMALL("Remove logo from input video."),
    .p.priv_class  = &delogo_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
    .priv_size     = sizeof(DelogoContext),
    .init          = init,
    .uninit        = uninit,
    FILTER_INPUTS(avfilter_vf_delogo_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
}

Definition at line 386 of file vf_delogo.c.