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FFmpeg/libavfilter/vf_floodfill.c
Paul B Mahol 2cc56741b1 avfilter: add floodfill filter
2017-08-05 21:05:22 +02:00

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/*
* Copyright (c) 2017 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct Points {
uint16_t x, y;
} Points;
typedef struct FloodfillContext {
const AVClass *class;
int x, y;
int s0, s1, s2, s3;
int d0, d1, d2, d3;
int back, front;
Points *points;
int (*is_same)(AVFrame *frame, int x, int y,
unsigned s0, unsigned s1, unsigned s2, unsigned s3);
void (*set_pixel)(AVFrame *frame, int x, int y,
unsigned d0, unsigned d1, unsigned d2, unsigned d3);
void (*pick_pixel)(AVFrame *frame, int x, int y,
int *s0, int *s1, int *s2, int *s3);
} FloodfillContext;
static int is_inside(int x, int y, int w, int h)
{
if (x >= 0 && x < w && y >= 0 && y < h)
return 1;
return 0;
}
static int is_same4(AVFrame *frame, int x, int y,
unsigned s0, unsigned s1, unsigned s2, unsigned s3)
{
unsigned c0 = frame->data[0][y * frame->linesize[0] + x];
unsigned c1 = frame->data[1][y * frame->linesize[1] + x];
unsigned c2 = frame->data[2][y * frame->linesize[2] + x];
unsigned c3 = frame->data[3][y * frame->linesize[3] + x];
if (s0 == c0 && s1 == c1 && s2 == c2 && s3 == c3)
return 1;
return 0;
}
static int is_same4_16(AVFrame *frame, int x, int y,
unsigned s0, unsigned s1, unsigned s2, unsigned s3)
{
unsigned c0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
unsigned c1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
unsigned c2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
unsigned c3 = AV_RN16(frame->data[3] + y * frame->linesize[3] + 2 * x);
if (s0 == c0 && s1 == c1 && s2 == c2 && s3 == c3)
return 1;
return 0;
}
static int is_same3(AVFrame *frame, int x, int y,
unsigned s0, unsigned s1, unsigned s2, unsigned s3)
{
unsigned c0 = frame->data[0][y * frame->linesize[0] + x];
unsigned c1 = frame->data[1][y * frame->linesize[1] + x];
unsigned c2 = frame->data[2][y * frame->linesize[2] + x];
if (s0 == c0 && s1 == c1 && s2 == c2)
return 1;
return 0;
}
static int is_same3_16(AVFrame *frame, int x, int y,
unsigned s0, unsigned s1, unsigned s2, unsigned s3)
{
unsigned c0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
unsigned c1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
unsigned c2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
if (s0 == c0 && s1 == c1 && s2 == c2)
return 1;
return 0;
}
static int is_same1(AVFrame *frame, int x, int y,
unsigned s0, unsigned s1, unsigned s2, unsigned s3)
{
unsigned c0 = frame->data[0][y * frame->linesize[0] + x];
if (s0 == c0)
return 1;
return 0;
}
static int is_same1_16(AVFrame *frame, int x, int y,
unsigned s0, unsigned s1, unsigned s2, unsigned s3)
{
unsigned c0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
if (s0 == c0)
return 1;
return 0;
}
static void set_pixel1(AVFrame *frame, int x, int y,
unsigned d0, unsigned d1, unsigned d2, unsigned d3)
{
frame->data[0][y * frame->linesize[0] + x] = d0;
}
static void set_pixel1_16(AVFrame *frame, int x, int y,
unsigned d0, unsigned d1, unsigned d2, unsigned d3)
{
AV_WN16(frame->data[0] + y * frame->linesize[0] + 2 * x, d0);
}
static void set_pixel3(AVFrame *frame, int x, int y,
unsigned d0, unsigned d1, unsigned d2, unsigned d3)
{
frame->data[0][y * frame->linesize[0] + x] = d0;
frame->data[1][y * frame->linesize[1] + x] = d1;
frame->data[2][y * frame->linesize[2] + x] = d2;
}
static void set_pixel3_16(AVFrame *frame, int x, int y,
unsigned d0, unsigned d1, unsigned d2, unsigned d3)
{
AV_WN16(frame->data[0] + y * frame->linesize[0] + 2 * x, d0);
AV_WN16(frame->data[1] + y * frame->linesize[1] + 2 * x, d1);
AV_WN16(frame->data[2] + y * frame->linesize[2] + 2 * x, d2);
}
static void set_pixel4(AVFrame *frame, int x, int y,
unsigned d0, unsigned d1, unsigned d2, unsigned d3)
{
frame->data[0][y * frame->linesize[0] + x] = d0;
frame->data[1][y * frame->linesize[1] + x] = d1;
frame->data[2][y * frame->linesize[2] + x] = d2;
frame->data[3][y * frame->linesize[3] + x] = d3;
}
static void set_pixel4_16(AVFrame *frame, int x, int y,
unsigned d0, unsigned d1, unsigned d2, unsigned d3)
{
AV_WN16(frame->data[0] + y * frame->linesize[0] + 2 * x, d0);
AV_WN16(frame->data[1] + y * frame->linesize[1] + 2 * x, d1);
AV_WN16(frame->data[2] + y * frame->linesize[2] + 2 * x, d2);
AV_WN16(frame->data[3] + y * frame->linesize[3] + 2 * x, d3);
}
static void pick_pixel1(AVFrame *frame, int x, int y,
int *s0, int *s1, int *s2, int *s3)
{
if (*s0 < 0)
*s0 = frame->data[0][y * frame->linesize[0] + x];
}
static void pick_pixel1_16(AVFrame *frame, int x, int y,
int *s0, int *s1, int *s2, int *s3)
{
if (*s0 < 0)
*s0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
}
static void pick_pixel3(AVFrame *frame, int x, int y,
int *s0, int *s1, int *s2, int *s3)
{
if (*s0 < 0)
*s0 = frame->data[0][y * frame->linesize[0] + x];
if (*s1 < 0)
*s1 = frame->data[1][y * frame->linesize[1] + x];
if (*s2 < 0)
*s2 = frame->data[2][y * frame->linesize[2] + x];
}
static void pick_pixel3_16(AVFrame *frame, int x, int y,
int *s0, int *s1, int *s2, int *s3)
{
if (*s0 < 0)
*s0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
if (*s1 < 0)
*s1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
if (*s2 < 0)
*s2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
}
static void pick_pixel4(AVFrame *frame, int x, int y,
int *s0, int *s1, int *s2, int *s3)
{
if (*s0 < 0)
*s0 = frame->data[0][y * frame->linesize[0] + x];
if (*s1 < 0)
*s1 = frame->data[1][y * frame->linesize[1] + x];
if (*s2 < 0)
*s2 = frame->data[2][y * frame->linesize[2] + x];
if (*s3 < 0)
*s3 = frame->data[3][y * frame->linesize[3] + x];
}
static void pick_pixel4_16(AVFrame *frame, int x, int y,
int *s0, int *s1, int *s2, int *s3)
{
if (*s0 < 0)
*s0 = AV_RN16(frame->data[0] + y * frame->linesize[0] + 2 * x);
if (*s1 < 0)
*s1 = AV_RN16(frame->data[1] + y * frame->linesize[1] + 2 * x);
if (*s2 < 0)
*s2 = AV_RN16(frame->data[2] + y * frame->linesize[2] + 2 * x);
if (*s3 < 0)
*s3 = AV_RN16(frame->data[3] + y * frame->linesize[3] + 2 * x);
}
static int config_input(AVFilterLink *inlink)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
AVFilterContext *ctx = inlink->dst;
FloodfillContext *s = ctx->priv;
int nb_planes = av_pix_fmt_count_planes(inlink->format);
int depth;
depth = desc->comp[0].depth;
if (depth == 8) {
switch (nb_planes) {
case 1: s->set_pixel = set_pixel1;
s->is_same = is_same1;
s->pick_pixel = pick_pixel1; break;
case 3: s->set_pixel = set_pixel3;
s->is_same = is_same3;
s->pick_pixel = pick_pixel3; break;
case 4: s->set_pixel = set_pixel4;
s->is_same = is_same4;
s->pick_pixel = pick_pixel4; break;
}
} else {
switch (nb_planes) {
case 1: s->set_pixel = set_pixel1_16;
s->is_same = is_same1_16;
s->pick_pixel = pick_pixel1_16; break;
case 3: s->set_pixel = set_pixel3_16;
s->is_same = is_same3_16;
s->pick_pixel = pick_pixel3_16; break;
case 4: s->set_pixel = set_pixel4_16;
s->is_same = is_same4_16;
s->pick_pixel = pick_pixel4_16; break;
}
}
s->front = s->back = 0;
s->points = av_calloc(inlink->w * inlink->h, 4 * sizeof(Points));
if (!s->points)
return AVERROR(ENOMEM);
return 0;
}
static int filter_frame(AVFilterLink *link, AVFrame *frame)
{
AVFilterContext *ctx = link->dst;
FloodfillContext *s = ctx->priv;
const unsigned d0 = s->d0;
const unsigned d1 = s->d1;
const unsigned d2 = s->d2;
const unsigned d3 = s->d3;
int s0 = s->s0;
int s1 = s->s1;
int s2 = s->s2;
int s3 = s->s3;
const int w = frame->width;
const int h = frame->height;
int ret;
if (ret = av_frame_make_writable(frame))
return ret;
if (is_inside(s->x, s->y, w, h)) {
s->pick_pixel(frame, s->x, s->y, &s0, &s1, &s2, &s3);
if (s->is_same(frame, s->x, s->y, s0, s1, s2, s3)) {
s->points[s->front].x = s->x;
s->points[s->front].y = s->y;
s->front++;
}
while (s->front > s->back) {
int x, y;
s->front--;
x = s->points[s->front].x;
y = s->points[s->front].y;
if (s->is_same(frame, x, y, s0, s1, s2, s3)) {
s->set_pixel(frame, x, y, d0, d1, d2, d3);
if (is_inside(x + 1, y, w, h)) {
s->points[s->front] .x = x + 1;
s->points[s->front++].y = y;
}
if (is_inside(x - 1, y, w, h)) {
s->points[s->front] .x = x - 1;
s->points[s->front++].y = y;
}
if (is_inside(x, y + 1, w, h)) {
s->points[s->front] .x = x;
s->points[s->front++].y = y + 1;
}
if (is_inside(x, y - 1, w, h)) {
s->points[s->front] .x = x;
s->points[s->front++].y = y - 1;
}
}
}
}
return ff_filter_frame(ctx->outputs[0], frame);
}
static av_cold int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pixel_fmts[] = {
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_GBRP,
AV_PIX_FMT_GBRP9,
AV_PIX_FMT_GBRP10,
AV_PIX_FMT_GBRAP10,
AV_PIX_FMT_GBRP12,
AV_PIX_FMT_GBRAP12,
AV_PIX_FMT_GBRP14,
AV_PIX_FMT_GBRP16,
AV_PIX_FMT_GBRAP16,
AV_PIX_FMT_GBRAP,
AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUVA444P9,
AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUVA444P10,
AV_PIX_FMT_YUV444P12,
AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
AVFilterFormats *formats;
formats = ff_make_format_list(pixel_fmts);
if (!formats)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, formats);
}
static av_cold void uninit(AVFilterContext *ctx)
{
FloodfillContext *s = ctx->priv;
av_freep(&s->points);
}
static const AVFilterPad floodfill_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad floodfill_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
#define OFFSET(x) offsetof(FloodfillContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption floodfill_options[] = {
{ "x", "set pixel x coordinate", OFFSET(x), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "y", "set pixel y coordinate", OFFSET(y), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "s0", "set source #0 component value", OFFSET(s0), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "s1", "set source #1 component value", OFFSET(s1), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "s2", "set source #2 component value", OFFSET(s2), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "s3", "set source #3 component value", OFFSET(s3), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "d0", "set destination #0 component value", OFFSET(d0), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "d1", "set destination #1 component value", OFFSET(d1), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "d2", "set destination #2 component value", OFFSET(d2), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "d3", "set destination #3 component value", OFFSET(d3), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(floodfill);
AVFilter ff_vf_floodfill = {
.name = "floodfill",
.description = NULL_IF_CONFIG_SMALL("Fill area with same color with another color."),
.priv_size = sizeof(FloodfillContext),
.priv_class = &floodfill_class,
.query_formats = query_formats,
.uninit = uninit,
.inputs = floodfill_inputs,
.outputs = floodfill_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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