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FFmpeg/libavfilter/vf_edgedetect.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

265 lines
9.3 KiB
C

/*
* Copyright (c) 2012-2014 Clément Bœsch <u pkh me>
*
* 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
*/
/**
* @file
* Edge detection filter
*
* @see https://en.wikipedia.org/wiki/Canny_edge_detector
*/
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
#include "edge_common.h"
#define PLANE_R 0x4
#define PLANE_G 0x1
#define PLANE_B 0x2
#define PLANE_Y 0x1
#define PLANE_U 0x2
#define PLANE_V 0x4
#define PLANE_A 0x8
enum FilterMode {
MODE_WIRES,
MODE_COLORMIX,
MODE_CANNY,
NB_MODE
};
struct plane_info {
uint8_t *tmpbuf;
uint16_t *gradients;
char *directions;
int width, height;
};
typedef struct EdgeDetectContext {
const AVClass *class;
struct plane_info planes[3];
int filter_planes;
int nb_planes;
double low, high;
uint8_t low_u8, high_u8;
int mode;
} EdgeDetectContext;
#define OFFSET(x) offsetof(EdgeDetectContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption edgedetect_options[] = {
{ "high", "set high threshold", OFFSET(high), AV_OPT_TYPE_DOUBLE, {.dbl=50/255.}, 0, 1, FLAGS },
{ "low", "set low threshold", OFFSET(low), AV_OPT_TYPE_DOUBLE, {.dbl=20/255.}, 0, 1, FLAGS },
{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_WIRES}, 0, NB_MODE-1, FLAGS, .unit = "mode" },
{ "wires", "white/gray wires on black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WIRES}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "colormix", "mix colors", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLORMIX}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "canny", "detect edges on planes", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CANNY}, INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "planes", "set planes to filter", OFFSET(filter_planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 1, 0x7, FLAGS, .unit = "flags" },
{ "y", "filter luma plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_Y}, 0, 0, FLAGS, .unit = "flags" },
{ "u", "filter u plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_U}, 0, 0, FLAGS, .unit = "flags" },
{ "v", "filter v plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_V}, 0, 0, FLAGS, .unit = "flags" },
{ "r", "filter red plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_R}, 0, 0, FLAGS, .unit = "flags" },
{ "g", "filter green plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_G}, 0, 0, FLAGS, .unit = "flags" },
{ "b", "filter blue plane", 0, AV_OPT_TYPE_CONST, {.i64=PLANE_B}, 0, 0, FLAGS, .unit = "flags" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(edgedetect);
static av_cold int init(AVFilterContext *ctx)
{
EdgeDetectContext *edgedetect = ctx->priv;
edgedetect->low_u8 = edgedetect->low * 255. + .5;
edgedetect->high_u8 = edgedetect->high * 255. + .5;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
const EdgeDetectContext *edgedetect = ctx->priv;
static const enum AVPixelFormat wires_pix_fmts[] = {AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
static const enum AVPixelFormat canny_pix_fmts[] = {AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
static const enum AVPixelFormat colormix_pix_fmts[] = {AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE};
const enum AVPixelFormat *pix_fmts = NULL;
if (edgedetect->mode == MODE_WIRES) {
pix_fmts = wires_pix_fmts;
} else if (edgedetect->mode == MODE_COLORMIX) {
pix_fmts = colormix_pix_fmts;
} else if (edgedetect->mode == MODE_CANNY) {
pix_fmts = canny_pix_fmts;
} else {
av_assert0(0);
}
return ff_set_common_formats_from_list(ctx, pix_fmts);
}
static int config_props(AVFilterLink *inlink)
{
int p;
AVFilterContext *ctx = inlink->dst;
EdgeDetectContext *edgedetect = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
edgedetect->nb_planes = inlink->format == AV_PIX_FMT_GRAY8 ? 1 : 3;
for (p = 0; p < edgedetect->nb_planes; p++) {
struct plane_info *plane = &edgedetect->planes[p];
int vsub = p ? desc->log2_chroma_h : 0;
int hsub = p ? desc->log2_chroma_w : 0;
plane->width = AV_CEIL_RSHIFT(inlink->w, hsub);
plane->height = AV_CEIL_RSHIFT(inlink->h, vsub);
plane->tmpbuf = av_malloc(plane->width * plane->height);
plane->gradients = av_calloc(plane->width * plane->height, sizeof(*plane->gradients));
plane->directions = av_malloc(plane->width * plane->height);
if (!plane->tmpbuf || !plane->gradients || !plane->directions)
return AVERROR(ENOMEM);
}
return 0;
}
static void color_mix(int w, int h,
uint8_t *dst, int dst_linesize,
const uint8_t *src, int src_linesize)
{
int i, j;
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++)
dst[i] = (dst[i] + src[i]) >> 1;
dst += dst_linesize;
src += src_linesize;
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
EdgeDetectContext *edgedetect = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int p, direct = 0;
AVFrame *out;
if (edgedetect->mode != MODE_COLORMIX && av_frame_is_writable(in)) {
direct = 1;
out = in;
} else {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
}
for (p = 0; p < edgedetect->nb_planes; p++) {
struct plane_info *plane = &edgedetect->planes[p];
uint8_t *tmpbuf = plane->tmpbuf;
uint16_t *gradients = plane->gradients;
int8_t *directions = plane->directions;
const int width = plane->width;
const int height = plane->height;
if (!((1 << p) & edgedetect->filter_planes)) {
if (!direct)
av_image_copy_plane(out->data[p], out->linesize[p],
in->data[p], in->linesize[p],
width, height);
continue;
}
/* gaussian filter to reduce noise */
ff_gaussian_blur_8(width, height,
tmpbuf, width,
in->data[p], in->linesize[p], 1);
/* compute the 16-bits gradients and directions for the next step */
ff_sobel_8(width, height,
gradients, width,
directions,width,
tmpbuf, width, 1);
/* non_maximum_suppression() will actually keep & clip what's necessary and
* ignore the rest, so we need a clean output buffer */
memset(tmpbuf, 0, width * height);
ff_non_maximum_suppression(width, height,
tmpbuf, width,
directions,width,
gradients, width);
/* keep high values, or low values surrounded by high values */
ff_double_threshold(edgedetect->low_u8, edgedetect->high_u8,
width, height,
out->data[p], out->linesize[p],
tmpbuf, width);
if (edgedetect->mode == MODE_COLORMIX) {
color_mix(width, height,
out->data[p], out->linesize[p],
in->data[p], in->linesize[p]);
}
}
if (!direct)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
int p;
EdgeDetectContext *edgedetect = ctx->priv;
for (p = 0; p < edgedetect->nb_planes; p++) {
struct plane_info *plane = &edgedetect->planes[p];
av_freep(&plane->tmpbuf);
av_freep(&plane->gradients);
av_freep(&plane->directions);
}
}
static const AVFilterPad edgedetect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_props,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_edgedetect = {
.name = "edgedetect",
.description = NULL_IF_CONFIG_SMALL("Detect and draw edge."),
.priv_size = sizeof(EdgeDetectContext),
.init = init,
.uninit = uninit,
FILTER_INPUTS(edgedetect_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.priv_class = &edgedetect_class,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};