vf_remap.c File Reference

Pixel remap filter This filter copies pixel by pixel a source frame to a target frame. More...

#include "libavutil/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "framesync.h"
#include "internal.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	RemapContext
struct	ThreadData
	Used for passing data between threads. More...

Macros
#define	OFFSET(x)   offsetof(RemapContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	DEFINE_REMAP_PLANAR_FUNC(name, bits, div)
	remap_planar algorithm expects planes of same size pixels are copied from source to target using : Target_frame[y][x] = Source_frame[ ymap[y][x] ][ [xmap[y][x] ]; More...
#define	DEFINE_REMAP_PACKED_FUNC(name, bits, div)
	remap_packed algorithm expects pixels with both padded bits (step) and number of components correctly set. More...

Functions
	AVFILTER_DEFINE_CLASS (remap)
static int	query_formats (AVFilterContext *ctx)
static int	config_input (AVFilterLink *inlink)
static int	process_frame (FFFrameSync *fs)
static int	config_output (AVFilterLink *outlink)
static int	activate (AVFilterContext *ctx)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	remap_options []
static const AVFilterPad	remap_inputs []
static const AVFilterPad	remap_outputs []
AVFilter	ff_vf_remap

Detailed Description

Pixel remap filter This filter copies pixel by pixel a source frame to a target frame.

It remaps the pixels to a new x,y destination based on two files ymap/xmap. Map files are passed as a parameter and are in PGM format (P2 or P5), where the values are y(rows)/x(cols) coordinates of the source_frame. The target frame dimension is based on mapfile dimensions: specified in the header of the mapfile and reflected in the number of datavalues. Dimensions of ymap and xmap must be equal. Datavalues must be positive or zero. Any datavalue in the ymap or xmap which value is higher then the source frame height or width is silently ignored, leaving a blank/chromakey pixel. This can safely be used as a feature to create overlays.

Algorithm digest: Target_frame[y][x] = Source_frame[ ymap[y][x] ][ [xmap[y][x] ];

Definition in file vf_remap.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(RemapContext, x)

Definition at line 58 of file vf_remap.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 59 of file vf_remap.c.

#define DEFINE_REMAP_PLANAR_FUNC	(		name,
			bits,
			div
	)

remap_planar algorithm expects planes of same size pixels are copied from source to target using : Target_frame[y][x] = Source_frame[ ymap[y][x] ][ [xmap[y][x] ];

Definition at line 129 of file vf_remap.c.

#define DEFINE_REMAP_PACKED_FUNC	(		name,
			bits,
			div
	)

remap_packed algorithm expects pixels with both padded bits (step) and number of components correctly set.

pixels are copied from source to target using : Target_frame[y][x] = Source_frame[ ymap[y][x] ][ [xmap[y][x] ];

Definition at line 178 of file vf_remap.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

remap

)

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 74 of file vf_remap.c.

static int config_input ( AVFilterLink *  inlink )

static

Definition at line 221 of file vf_remap.c.

static int process_frame ( FFFrameSync *  fs )

static

Definition at line 248 of file vf_remap.c.

Referenced by config_output().

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 287 of file vf_remap.c.

static int activate ( AVFilterContext *  ctx )

static

Definition at line 335 of file vf_remap.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 341 of file vf_remap.c.

Variable Documentation

const AVOption remap_options[]

static

Initial value:

= {
    { NULL }
}

Definition at line 61 of file vf_remap.c.

const AVFilterPad remap_inputs[]

static

Initial value:

= {
    {
        .name         = "source",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = config_input,
    },
    {
        .name         = "xmap",
        .type         = AVMEDIA_TYPE_VIDEO,
    },
    {
        .name         = "ymap",
        .type         = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
}

Definition at line 348 of file vf_remap.c.

const AVFilterPad remap_outputs[]

static

Initial value:

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

Definition at line 365 of file vf_remap.c.

AVFilter ff_vf_remap

Initial value:

= {
    .name          = "remap",
    .description   = NULL_IF_CONFIG_SMALL("Remap pixels."),
    .priv_size     = sizeof(RemapContext),
    .uninit        = uninit,
    .query_formats = query_formats,
    .activate      = activate,
    .inputs        = remap_inputs,
    .outputs       = remap_outputs,
    .priv_class    = &remap_class,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 374 of file vf_remap.c.