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/*
* Copyright (c) 2012-2013 Oka Motofumi (chikuzen.mo at gmail dot com)
* Copyright (c) 2015 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/imgutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct NContext {
const AVClass *class;
int planeheight[4];
int planewidth[4];
int nb_planes;
int threshold[4];
int coordinates;
uint8_t *buffer;
void (*filter)(uint8_t *dst, const uint8_t *p1, int width,
int threshold, const uint8_t *coordinates[], int coord);
} NContext;
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
};
return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
}
static av_cold void uninit(AVFilterContext *ctx)
{
NContext *s = ctx->priv;
av_freep(&s->buffer);
}
static inline void line_copy8(uint8_t *line, const uint8_t *srcp, int width, int mergin)
{
int i;
memcpy(line, srcp, width);
for (i = mergin; i > 0; i--) {
line[-i] = line[i];
line[width - 1 + i] = line[width - 1 - i];
}
}
static void erosion(uint8_t *dst, const uint8_t *p1, int width,
int threshold, const uint8_t *coordinates[], int coord)
{
int x, i;
for (x = 0; x < width; x++) {
int min = p1[x];
int limit = FFMAX(min - threshold, 0);
for (i = 0; i < 8; i++) {
if (coord & (1 << i)) {
min = FFMIN(min, *(coordinates[i] + x));
}
min = FFMAX(min, limit);
}
dst[x] = min;
}
}
static void dilation(uint8_t *dst, const uint8_t *p1, int width,
int threshold, const uint8_t *coordinates[], int coord)
{
int x, i;
for (x = 0; x < width; x++) {
int max = p1[x];
int limit = FFMIN(max + threshold, 255);
for (i = 0; i < 8; i++) {
if (coord & (1 << i)) {
max = FFMAX(max, *(coordinates[i] + x));
}
max = FFMIN(max, limit);
}
dst[x] = max;
}
}
static void deflate(uint8_t *dst, const uint8_t *p1, int width,
int threshold, const uint8_t *coordinates[], int coord)
{
int x, i;
for (x = 0; x < width; x++) {
int sum = 0;
int limit = FFMAX(p1[x] - threshold, 0);
for (i = 0; i < 8; sum += *(coordinates[i++] + x));
dst[x] = FFMAX(FFMIN(sum / 8, p1[x]), limit);
}
}
static void inflate(uint8_t *dst, const uint8_t *p1, int width,
int threshold, const uint8_t *coordinates[], int coord)
{
int x, i;
for (x = 0; x < width; x++) {
int sum = 0;
int limit = FFMIN(p1[x] + threshold, 255);
for (i = 0; i < 8; sum += *(coordinates[i++] + x));
dst[x] = FFMIN(FFMAX(sum / 8, p1[x]), limit);
}
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
NContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int ret;
if ((ret = av_image_fill_linesizes(s->planewidth, inlink->format, inlink->w)) < 0)
return ret;
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->nb_planes = av_pix_fmt_count_planes(inlink->format);
s->buffer = av_malloc(3 * (s->planewidth[0] + 32));
if (!s->buffer)
return AVERROR(ENOMEM);
if (!strcmp(ctx->filter->name, "erosion"))
s->filter = erosion;
else if (!strcmp(ctx->filter->name, "dilation"))
s->filter = dilation;
else if (!strcmp(ctx->filter->name, "deflate"))
s->filter = deflate;
else if (!strcmp(ctx->filter->name, "inflate"))
s->filter = inflate;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
NContext *s = ctx->priv;
AVFrame *out;
int plane, y;
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 (plane = 0; plane < s->nb_planes; plane++) {
const int threshold = s->threshold[plane];
if (threshold) {
const uint8_t *src = in->data[plane];
uint8_t *dst = out->data[plane];
int stride = in->linesize[plane];
int height = s->planeheight[plane];
int width = s->planewidth[plane];
uint8_t *p0 = s->buffer + 16;
uint8_t *p1 = p0 + s->planewidth[0];
uint8_t *p2 = p1 + s->planewidth[0];
uint8_t *orig = p0, *end = p2;
line_copy8(p0, src + stride, width, 1);
line_copy8(p1, src, width, 1);
for (y = 0; y < height; y++) {
const uint8_t *coordinates[] = { p0 - 1, p0, p0 + 1,
p1 - 1, p1 + 1,
p2 - 1, p2, p2 + 1};
src += stride * (y < height - 1 ? 1 : -1);
line_copy8(p2, src, width, 1);
s->filter(dst, p1, width, threshold, coordinates, s->coordinates);
p0 = p1;
p1 = p2;
p2 = (p2 == end) ? orig: p2 + s->planewidth[0];
dst += out->linesize[plane];
}
} else {
av_image_copy_plane(out->data[plane], out->linesize[plane],
in->data[plane], in->linesize[plane],
s->planewidth[plane], s->planeheight[plane]);
}
}
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad neighbor_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.config_props = config_input,
},
{ NULL }
};
static const AVFilterPad neighbor_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
},
{ NULL }
};
#define OFFSET(x) offsetof(NContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define DEFINE_NEIGHBOR_FILTER(name_, description_) \
AVFILTER_DEFINE_CLASS(name_); \
\
AVFilter ff_vf_##name_ = { \
.name = #name_, \
.description = NULL_IF_CONFIG_SMALL(description_), \
.priv_size = sizeof(NContext), \
.priv_class = &name_##_class, \
.uninit = uninit, \
.query_formats = query_formats, \
.inputs = neighbor_inputs, \
.outputs = neighbor_outputs, \
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, \
}
#if CONFIG_EROSION_FILTER
static const AVOption erosion_options[] = {
{ "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "coordinates", "set coordinates", OFFSET(coordinates), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, FLAGS },
{ NULL }
};
DEFINE_NEIGHBOR_FILTER(erosion, "Apply erosion effect.");
#endif /* CONFIG_EROSION_FILTER */
#if CONFIG_DILATION_FILTER
static const AVOption dilation_options[] = {
{ "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "coordinates", "set coordinates", OFFSET(coordinates), AV_OPT_TYPE_INT, {.i64=255}, 0, 255, FLAGS },
{ NULL }
};
DEFINE_NEIGHBOR_FILTER(dilation, "Apply dilation effect.");
#endif /* CONFIG_DILATION_FILTER */
#if CONFIG_DEFLATE_FILTER
static const AVOption deflate_options[] = {
{ "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ NULL }
};
DEFINE_NEIGHBOR_FILTER(deflate, "Apply deflate effect.");
#endif /* CONFIG_DEFLATE_FILTER */
#if CONFIG_INFLATE_FILTER
static const AVOption inflate_options[] = {
{ "threshold0", "set threshold for 1st plane", OFFSET(threshold[0]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold1", "set threshold for 2nd plane", OFFSET(threshold[1]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold2", "set threshold for 3rd plane", OFFSET(threshold[2]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ "threshold3", "set threshold for 4th plane", OFFSET(threshold[3]), AV_OPT_TYPE_INT, {.i64=65535}, 0, 65535, FLAGS },
{ NULL }
};
DEFINE_NEIGHBOR_FILTER(inflate, "Apply inflate effect.");
#endif /* CONFIG_INFLATE_FILTER */
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