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FFmpeg/libavfilter/vf_floodfill.c
Andreas Rheinhardt b4f5201967 avfilter: Replace query_formats callback with union of list and callback 
If one looks at the many query_formats callbacks in existence,
one will immediately recognize that there is one type of default
callback for video and a slightly different default callback for
audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);"
for video with a filter-specific pix_fmts list. For audio, it is
the same with a filter-specific sample_fmts list together with
ff_set_common_all_samplerates() and ff_set_common_all_channel_counts().

This commit allows to remove the boilerplate query_formats callbacks
by replacing said callback with a union consisting the old callback
and pointers for pixel and sample format arrays. For the not uncommon
case in which these lists only contain a single entry (besides the
sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also
added to the union to store them directly in the AVFilter,
thereby avoiding a relocation.

The state of said union will be contained in a new, dedicated AVFilter
field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t
in order to create a hole for this new field; this is no problem, as
the maximum of all the nb_inputs is four; for nb_outputs it is only
two).

The state's default value coincides with the earlier default of
query_formats being unset, namely that the filter accepts all formats
(and also sample rates and channel counts/layouts for audio)
provided that these properties agree coincide for all inputs and
outputs.

By using different union members for audio and video filters
the type-unsafety of using the same functions for audio and video
lists will furthermore be more confined to formats.c than before.

When the new fields are used, they will also avoid allocations:
Currently something nearly equivalent to ff_default_query_formats()
is called after every successful call to a query_formats callback;
yet in the common case that the newly allocated AVFilterFormats
are not used at all (namely if there are no free links) these newly
allocated AVFilterFormats are freed again without ever being used.
Filters no longer using the callback will not exhibit this any more.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-10-05 17:48:25 +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 s[4];
int S[4];
int d[4];
int nb_planes;
int back, front;
Points *points;
int (*is_same)(const 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)(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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(const 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 depth;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
depth = desc->comp[0].depth;
if (depth == 8) {
switch (s->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 (s->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->d[0];
const unsigned d1 = s->d[1];
const unsigned d2 = s->d[2];
const unsigned d3 = s->d[3];
int s0 = s->s[0];
int s1 = s->s[1];
int s2 = s->s[2];
int s3 = s->s[3];
const int w = frame->width;
const int h = frame->height;
int i, ret;
if (is_inside(s->x, s->y, w, h)) {
s->pick_pixel(frame, s->x, s->y, &s0, &s1, &s2, &s3);
s->S[0] = s0;
s->S[1] = s1;
s->S[2] = s2;
s->S[3] = s3;
for (i = 0; i < s->nb_planes; i++) {
if (s->S[i] != s->d[i])
break;
}
if (i == s->nb_planes)
goto end;
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++;
}
if (ret = av_frame_make_writable(frame))
return ret;
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;
}
}
}
}
end:
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_GRAY9, AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
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_YUV444P16, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_NONE
};
return ff_set_common_formats_from_list(ctx, pixel_fmts);
}
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,
},
};
static const AVFilterPad floodfill_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
};
#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(s[0]), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "s1", "set source #1 component value", OFFSET(s[1]), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "s2", "set source #2 component value", OFFSET(s[2]), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "s3", "set source #3 component value", OFFSET(s[3]), AV_OPT_TYPE_INT, {.i64=0},-1, UINT16_MAX, FLAGS },
{ "d0", "set destination #0 component value", OFFSET(d[0]), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "d1", "set destination #1 component value", OFFSET(d[1]), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "d2", "set destination #2 component value", OFFSET(d[2]), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ "d3", "set destination #3 component value", OFFSET(d[3]), AV_OPT_TYPE_INT, {.i64=0}, 0, UINT16_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(floodfill);
const 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,
.uninit = uninit,
FILTER_INPUTS(floodfill_inputs),
FILTER_OUTPUTS(floodfill_outputs),
FILTER_QUERY_FUNC(query_formats),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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