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avfilter: add epx pixel art scaler

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This commit is contained in:
Paul B Mahol 2021-01-22 19:54:52 +01:00
parent 833338a02c
commit b897b52618
6 changed files with 303 additions and 1 deletions
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1
Changelog
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@ -56,6 +56,7 @@ version <next>:
- shufflepixels filter
- tmidequalizer filter
- estdif filter
- epx filter
version 4.3:

12
doc/filters.texi
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@ -10943,6 +10943,18 @@ Can be either @var{normal} or @var{diff}. Default is @var{normal}.
between neighbour histogram values.
@end table
@section epx
Apply the EPX magnification filter which is designed for pixel art.
It accepts the following option:
@table @option
@item n
Set the scaling dimension: @code{2} for @code{2xEPX}, @code{3} for
@code{3xEPX}.
Default is @code{3}.
@end table
@section eq
Set brightness, contrast, saturation and approximate gamma adjustment.

1
libavfilter/Makefile
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@ -248,6 +248,7 @@ OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
OBJS-$(CONFIG_EDGEDETECT_FILTER) += vf_edgedetect.o
OBJS-$(CONFIG_ELBG_FILTER) += vf_elbg.o
OBJS-$(CONFIG_ENTROPY_FILTER) += vf_entropy.o
OBJS-$(CONFIG_EPX_FILTER) += vf_epx.o
OBJS-$(CONFIG_EQ_FILTER) += vf_eq.o
OBJS-$(CONFIG_EROSION_FILTER) += vf_neighbor.o
OBJS-$(CONFIG_EROSION_OPENCL_FILTER) += vf_neighbor_opencl.o opencl.o \

1
libavfilter/allfilters.c
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@ -234,6 +234,7 @@ extern AVFilter ff_vf_drawtext;
extern AVFilter ff_vf_edgedetect;
extern AVFilter ff_vf_elbg;
extern AVFilter ff_vf_entropy;
extern AVFilter ff_vf_epx;
extern AVFilter ff_vf_eq;
extern AVFilter ff_vf_erosion;
extern AVFilter ff_vf_erosion_opencl;

2
libavfilter/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 96
#define LIBAVFILTER_VERSION_MINOR 97
#define LIBAVFILTER_VERSION_MICRO 100

287
libavfilter/vf_epx.c Normal file
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@ -0,0 +1,287 @@
/*
* 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/avassert.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
typedef struct EPXContext {
const AVClass *class;
int n;
int (*epx_slice)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} EPXContext;
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
#define OFFSET(x) offsetof(EPXContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption epx_options[] = {
{ "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 3, .flags = FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(epx);
static int epx2_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ThreadData *td = arg;
const AVFrame *in = td->in;
AVFrame *out = td->out;
const int slice_start = (in->height * jobnr ) / nb_jobs;
const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
for (int p = 0; p < 1; p++) {
const int width = in->width;
const int height = in->height;
const int src_linesize = in->linesize[p] / 4;
const int dst_linesize = out->linesize[p] / 4;
const uint32_t *src = (const uint32_t *)in->data[p];
uint32_t *dst = (uint32_t *)out->data[p];
const uint32_t *src_line[3];
src_line[0] = src + src_linesize * FFMAX(slice_start - 1, 0);
src_line[1] = src + src_linesize * slice_start;
src_line[2] = src + src_linesize * FFMIN(slice_start + 1, height-1);
for (int y = slice_start; y < slice_end; y++) {
uint32_t *dst_line[2];
dst_line[0] = dst + dst_linesize*2*y;
dst_line[1] = dst + dst_linesize*(2*y+1);
for (int x = 0; x < width; x++) {
uint32_t E0, E1, E2, E3;
uint32_t B, D, E, F, H;
B = src_line[0][x];
D = src_line[1][FFMAX(x-1, 0)];
E = src_line[1][x];
F = src_line[1][FFMIN(x+1, width - 1)];
H = src_line[2][x];
if (B != H && D != F) {
E0 = D == B ? D : E;
E1 = B == F ? F : E;
E2 = D == H ? D : E;
E3 = H == F ? F : E;
} else {
E0 = E;
E1 = E;
E2 = E;
E3 = E;
}
dst_line[0][x*2] = E0;
dst_line[0][x*2+1] = E1;
dst_line[1][x*2] = E2;
dst_line[1][x*2+1] = E3;
}
src_line[0] = src_line[1];
src_line[1] = src_line[2];
src_line[2] = src_line[1];
if (y < height - 1)
src_line[2] += src_linesize;
}
}
return 0;
}
static int epx3_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
{
ThreadData *td = arg;
const AVFrame *in = td->in;
AVFrame *out = td->out;
const int slice_start = (in->height * jobnr ) / nb_jobs;
const int slice_end = (in->height * (jobnr+1)) / nb_jobs;
for (int p = 0; p < 1; p++) {
const int width = in->width;
const int height = in->height;
const int src_linesize = in->linesize[p] / 4;
const int dst_linesize = out->linesize[p] / 4;
const uint32_t *src = (const uint32_t *)in->data[p];
uint32_t *dst = (uint32_t *)out->data[p];
const uint32_t *src_line[3];
src_line[0] = src + src_linesize * FFMAX(slice_start - 1, 0);
src_line[1] = src + src_linesize * slice_start;
src_line[2] = src + src_linesize * FFMIN(slice_start + 1, height-1);
for (int y = slice_start; y < slice_end; y++) {
uint32_t *dst_line[3];
dst_line[0] = dst + dst_linesize*3*y;
dst_line[1] = dst + dst_linesize*(3*y+1);
dst_line[2] = dst + dst_linesize*(3*y+2);
for (int x = 0; x < width; x++) {
uint32_t E0, E1, E2, E3, E4, E5, E6, E7, E8;
uint32_t A, B, C, D, E, F, G, H, I;
A = src_line[0][FFMAX(x-1, 0)];
B = src_line[0][x];
C = src_line[0][FFMIN(x+1, width - 1)];
D = src_line[1][FFMAX(x-1, 0)];
E = src_line[1][x];
F = src_line[1][FFMIN(x+1, width - 1)];
G = src_line[2][FFMAX(x-1, 0)];
H = src_line[2][x];
I = src_line[2][FFMIN(x+1, width - 1)];
if (B != H && D != F) {
E0 = D == B ? D : E;
E1 = (D == B && E != C) || (B == F && E != A) ? B : E;
E2 = B == F ? F : E;
E3 = (D == B && E != G) || (D == H && E != A) ? D : E;
E4 = E;
E5 = (B == F && E != I) || (H == F && E != C) ? F : E;
E6 = D == H ? D : E;
E7 = (D == H && E != I) || (H == F && E != G) ? H : E;
E8 = H == F ? F : E;
} else {
E0 = E;
E1 = E;
E2 = E;
E3 = E;
E4 = E;
E5 = E;
E6 = E;
E7 = E;
E8 = E;
}
dst_line[0][x*3] = E0;
dst_line[0][x*3+1] = E1;
dst_line[0][x*3+2] = E2;
dst_line[1][x*3] = E3;
dst_line[1][x*3+1] = E4;
dst_line[1][x*3+2] = E5;
dst_line[2][x*3] = E6;
dst_line[2][x*3+1] = E7;
dst_line[2][x*3+2] = E8;
}
src_line[0] = src_line[1];
src_line[1] = src_line[2];
src_line[2] = src_line[1];
if (y < height - 1)
src_line[2] += src_linesize;
}
}
return 0;
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
EPXContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
const AVPixFmtDescriptor *desc;
desc = av_pix_fmt_desc_get(outlink->format);
if (!desc)
return AVERROR_BUG;
outlink->w = inlink->w * s->n;
outlink->h = inlink->h * s->n;
switch (s->n) {
case 2:
s->epx_slice = epx2_slice;
break;
case 3:
s->epx_slice = epx3_slice;
break;
}
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
AV_PIX_FMT_NONE,
};
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
if (!fmts_list)
return AVERROR(ENOMEM);
return ff_set_common_formats(ctx, fmts_list);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
EPXContext *s = ctx->priv;
ThreadData td;
AVFrame *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);
td.in = in, td.out = out;
ctx->internal->execute(ctx, s->epx_slice, &td, NULL, FFMIN(inlink->h, ff_filter_get_nb_threads(ctx)));
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
{ NULL }
};
AVFilter ff_vf_epx = {
.name = "epx",
.description = NULL_IF_CONFIG_SMALL("Scale the input using EPX algorithm."),
.inputs = inputs,
.outputs = outputs,
.query_formats = query_formats,
.priv_size = sizeof(EPXContext),
.priv_class = &epx_class,
.flags = AVFILTER_FLAG_SLICE_THREADS,
};