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author | Paul B Mahol <onemda@gmail.com> | 2021-01-22 19:54:52 +0100 |
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committer | Paul B Mahol <onemda@gmail.com> | 2021-01-25 00:48:35 +0100 |
commit | b897b5261820ff767f614770648abaa8a2880ec0 (patch) | |
tree | daf9eb95323ae082d362898c22f0c6172a125404 /libavfilter/vf_epx.c | |
parent | 833338a02ce3aa657c87fae374167e2f1978fc86 (diff) | |
download | ffmpeg-b897b5261820ff767f614770648abaa8a2880ec0.tar.gz |
avfilter: add epx pixel art scaler
Diffstat (limited to 'libavfilter/vf_epx.c')
-rw-r--r-- | libavfilter/vf_epx.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/libavfilter/vf_epx.c b/libavfilter/vf_epx.c new file mode 100644 index 0000000000..65b8975c23 --- /dev/null +++ b/libavfilter/vf_epx.c @@ -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, +}; |