/* * This file is part of FFmpeg. * * Copyright (c) 2011, 2012 Hyllian/Jararaca <sergiogdb@gmail.com> * Copyright (c) 2014 Arwa Arif <arwaarif1994@gmail.com> * * 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 * XBR Filter is used for depixelization of image. * This is based on Hyllian's xBR shader. * * @see https://forums.libretro.com/t/xbr-algorithm-tutorial/123 * @see https://github.com/yoyofr/iFBA/blob/master/fba_src/src/intf/video/scalers/xbr.cpp */ #include "libavutil/opt.h" #include "libavutil/avassert.h" #include "libavutil/pixdesc.h" #include "internal.h" #define LB_MASK 0x00FEFEFE #define RED_BLUE_MASK 0x00FF00FF #define GREEN_MASK 0x0000FF00 #ifdef PI #undef PI #endif typedef int (*xbrfunc_t)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs); typedef struct XBRContext { const AVClass *class; int n; xbrfunc_t func; uint32_t rgbtoyuv[1<<24]; } XBRContext; typedef struct ThreadData { AVFrame *in, *out; const uint32_t *rgbtoyuv; } ThreadData; #define OFFSET(x) offsetof(XBRContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption xbr_options[] = { { "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 4, .flags = FLAGS }, { NULL } }; AVFILTER_DEFINE_CLASS(xbr); static uint32_t pixel_diff(uint32_t x, uint32_t y, const uint32_t *r2y) { #define YMASK 0xff0000 #define UMASK 0x00ff00 #define VMASK 0x0000ff #define ABSDIFF(a,b) (abs((int)(a)-(int)(b))) uint32_t yuv1 = r2y[x & 0xffffff]; uint32_t yuv2 = r2y[y & 0xffffff]; return (ABSDIFF(yuv1 & YMASK, yuv2 & YMASK) >> 16) + (ABSDIFF(yuv1 & UMASK, yuv2 & UMASK) >> 8) + ABSDIFF(yuv1 & VMASK, yuv2 & VMASK); } #define ALPHA_BLEND_128_W(a, b) ((((a) & LB_MASK) >> 1) + (((b) & LB_MASK) >> 1)) #define ALPHA_BLEND_BASE(a, b, m, s) ( (RED_BLUE_MASK & (((a) & RED_BLUE_MASK) + (((((b) & RED_BLUE_MASK) - ((a) & RED_BLUE_MASK)) * (m)) >> (s)))) \ | (GREEN_MASK & (((a) & GREEN_MASK) + (((((b) & GREEN_MASK) - ((a) & GREEN_MASK)) * (m)) >> (s))))) #define ALPHA_BLEND_32_W(a, b) ALPHA_BLEND_BASE(a, b, 1, 3) #define ALPHA_BLEND_64_W(a, b) ALPHA_BLEND_BASE(a, b, 1, 2) #define ALPHA_BLEND_192_W(a, b) ALPHA_BLEND_BASE(a, b, 3, 2) #define ALPHA_BLEND_224_W(a, b) ALPHA_BLEND_BASE(a, b, 7, 3) #define df(A, B) pixel_diff(A, B, r2y) #define eq(A, B) (df(A, B) < 155) #define FILT2(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, \ N0, N1, N2, N3) do { \ if (PE != PH && PE != PF) { \ const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2); \ const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2); \ if (e <= i) { \ const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \ if (e < i && (!eq(PF,PB) && !eq(PH,PD) || eq(PE,PI) \ && (!eq(PF,I4) && !eq(PH,I5)) \ || eq(PE,PG) || eq(PE,PC))) { \ const unsigned ke = df(PF,PG); \ const unsigned ki = df(PH,PC); \ const int left = ke<<1 <= ki && PE != PG && PD != PG; \ const int up = ke >= ki<<1 && PE != PC && PB != PC; \ if (left && up) { \ E[N3] = ALPHA_BLEND_224_W(E[N3], px); \ E[N2] = ALPHA_BLEND_64_W( E[N2], px); \ E[N1] = E[N2]; \ } else if (left) { \ E[N3] = ALPHA_BLEND_192_W(E[N3], px); \ E[N2] = ALPHA_BLEND_64_W( E[N2], px); \ } else if (up) { \ E[N3] = ALPHA_BLEND_192_W(E[N3], px); \ E[N1] = ALPHA_BLEND_64_W( E[N1], px); \ } else { /* diagonal */ \ E[N3] = ALPHA_BLEND_128_W(E[N3], px); \ } \ } else { \ E[N3] = ALPHA_BLEND_128_W(E[N3], px); \ } \ } \ } \ } while (0) #define FILT3(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, \ N0, N1, N2, N3, N4, N5, N6, N7, N8) do { \ if (PE != PH && PE != PF) { \ const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2); \ const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2); \ if (e <= i) { \ const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \ if (e < i && (!eq(PF,PB) && !eq(PF,PC) || !eq(PH,PD) && !eq(PH,PG) || eq(PE,PI) \ && (!eq(PF,F4) && !eq(PF,I4) || !eq(PH,H5) && !eq(PH,I5)) \ || eq(PE,PG) || eq(PE,PC))) { \ const unsigned ke = df(PF,PG); \ const unsigned ki = df(PH,PC); \ const int left = ke<<1 <= ki && PE != PG && PD != PG; \ const int up = ke >= ki<<1 && PE != PC && PB != PC; \ if (left && up) { \ E[N7] = ALPHA_BLEND_192_W(E[N7], px); \ E[N6] = ALPHA_BLEND_64_W( E[N6], px); \ E[N5] = E[N7]; \ E[N2] = E[N6]; \ E[N8] = px; \ } else if (left) { \ E[N7] = ALPHA_BLEND_192_W(E[N7], px); \ E[N5] = ALPHA_BLEND_64_W( E[N5], px); \ E[N6] = ALPHA_BLEND_64_W( E[N6], px); \ E[N8] = px; \ } else if (up) { \ E[N5] = ALPHA_BLEND_192_W(E[N5], px); \ E[N7] = ALPHA_BLEND_64_W( E[N7], px); \ E[N2] = ALPHA_BLEND_64_W( E[N2], px); \ E[N8] = px; \ } else { /* diagonal */ \ E[N8] = ALPHA_BLEND_224_W(E[N8], px); \ E[N5] = ALPHA_BLEND_32_W( E[N5], px); \ E[N7] = ALPHA_BLEND_32_W( E[N7], px); \ } \ } else { \ E[N8] = ALPHA_BLEND_128_W(E[N8], px); \ } \ } \ } \ } while (0) #define FILT4(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, \ N15, N14, N11, N3, N7, N10, N13, N12, N9, N6, N2, N1, N5, N8, N4, N0) do { \ if (PE != PH && PE != PF) { \ const unsigned e = df(PE,PC) + df(PE,PG) + df(PI,H5) + df(PI,F4) + (df(PH,PF)<<2); \ const unsigned i = df(PH,PD) + df(PH,I5) + df(PF,I4) + df(PF,PB) + (df(PE,PI)<<2); \ if (e <= i) { \ const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \ if (e < i && (!eq(PF,PB) && !eq(PH,PD) || eq(PE,PI) \ && (!eq(PF,I4) && !eq(PH,I5)) \ || eq(PE,PG) || eq(PE,PC))) { \ const unsigned ke = df(PF,PG); \ const unsigned ki = df(PH,PC); \ const int left = ke<<1 <= ki && PE != PG && PD != PG; \ const int up = ke >= ki<<1 && PE != PC && PB != PC; \ if (left && up) { \ E[N13] = ALPHA_BLEND_192_W(E[N13], px); \ E[N12] = ALPHA_BLEND_64_W( E[N12], px); \ E[N15] = E[N14] = E[N11] = px; \ E[N10] = E[N3] = E[N12]; \ E[N7] = E[N13]; \ } else if (left) { \ E[N11] = ALPHA_BLEND_192_W(E[N11], px); \ E[N13] = ALPHA_BLEND_192_W(E[N13], px); \ E[N10] = ALPHA_BLEND_64_W( E[N10], px); \ E[N12] = ALPHA_BLEND_64_W( E[N12], px); \ E[N14] = px; \ E[N15] = px; \ } else if (up) { \ E[N14] = ALPHA_BLEND_192_W(E[N14], px); \ E[N7 ] = ALPHA_BLEND_192_W(E[N7 ], px); \ E[N10] = ALPHA_BLEND_64_W( E[N10], px); \ E[N3 ] = ALPHA_BLEND_64_W( E[N3 ], px); \ E[N11] = px; \ E[N15] = px; \ } else { /* diagonal */ \ E[N11] = ALPHA_BLEND_128_W(E[N11], px); \ E[N14] = ALPHA_BLEND_128_W(E[N14], px); \ E[N15] = px; \ } \ } else { \ E[N15] = ALPHA_BLEND_128_W(E[N15], px); \ } \ } \ } \ } while (0) static av_always_inline void xbr_filter(const ThreadData *td, int jobnr, int nb_jobs, int n) { int x, y; const AVFrame *input = td->in; AVFrame *output = td->out; const uint32_t *r2y = td->rgbtoyuv; const int slice_start = (input->height * jobnr ) / nb_jobs; const int slice_end = (input->height * (jobnr+1)) / nb_jobs; const int nl = output->linesize[0] >> 2; const int nl1 = nl + nl; const int nl2 = nl1 + nl; for (y = slice_start; y < slice_end; y++) { uint32_t *E = (uint32_t *)(output->data[0] + y * output->linesize[0] * n); const uint32_t *sa2 = (uint32_t *)(input->data[0] + y * input->linesize[0] - 8); /* center */ const uint32_t *sa1 = sa2 - (input->linesize[0]>>2); /* up x1 */ const uint32_t *sa0 = sa1 - (input->linesize[0]>>2); /* up x2 */ const uint32_t *sa3 = sa2 + (input->linesize[0]>>2); /* down x1 */ const uint32_t *sa4 = sa3 + (input->linesize[0]>>2); /* down x2 */ if (y <= 1) { sa0 = sa1; if (y == 0) { sa0 = sa1 = sa2; } } if (y >= input->height - 2) { sa4 = sa3; if (y == input->height - 1) { sa4 = sa3 = sa2; } } for (x = 0; x < input->width; x++) { const uint32_t B1 = sa0[2]; const uint32_t PB = sa1[2]; const uint32_t PE = sa2[2]; const uint32_t PH = sa3[2]; const uint32_t H5 = sa4[2]; const int pprev = 2 - (x > 0); const uint32_t A1 = sa0[pprev]; const uint32_t PA = sa1[pprev]; const uint32_t PD = sa2[pprev]; const uint32_t PG = sa3[pprev]; const uint32_t G5 = sa4[pprev]; const int pprev2 = pprev - (x > 1); const uint32_t A0 = sa1[pprev2]; const uint32_t D0 = sa2[pprev2]; const uint32_t G0 = sa3[pprev2]; const int pnext = 3 - (x == input->width - 1); const uint32_t C1 = sa0[pnext]; const uint32_t PC = sa1[pnext]; const uint32_t PF = sa2[pnext]; const uint32_t PI = sa3[pnext]; const uint32_t I5 = sa4[pnext]; const int pnext2 = pnext + 1 - (x >= input->width - 2); const uint32_t C4 = sa1[pnext2]; const uint32_t F4 = sa2[pnext2]; const uint32_t I4 = sa3[pnext2]; if (n == 2) { E[0] = E[1] = // 0, 1 E[nl] = E[nl + 1] = PE; // 2, 3 FILT2(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, 0, 1, nl, nl+1); FILT2(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, nl, 0, nl+1, 1); FILT2(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, nl+1, nl, 1, 0); FILT2(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, 1, nl+1, 0, nl); } else if (n == 3) { E[0] = E[1] = E[2] = // 0, 1, 2 E[nl] = E[nl+1] = E[nl+2] = // 3, 4, 5 E[nl1] = E[nl1+1] = E[nl1+2] = PE; // 6, 7, 8 FILT3(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, 0, 1, 2, nl, nl+1, nl+2, nl1, nl1+1, nl1+2); FILT3(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, nl1, nl, 0, nl1+1, nl+1, 1, nl1+2, nl+2, 2); FILT3(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, nl1+2, nl1+1, nl1, nl+2, nl+1, nl, 2, 1, 0); FILT3(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, 2, nl+2, nl1+2, 1, nl+1, nl1+1, 0, nl, nl1); } else if (n == 4) { E[0] = E[1] = E[2] = E[3] = // 0, 1, 2, 3 E[nl] = E[nl+1] = E[nl+2] = E[nl+3] = // 4, 5, 6, 7 E[nl1] = E[nl1+1] = E[nl1+2] = E[nl1+3] = // 8, 9, 10, 11 E[nl2] = E[nl2+1] = E[nl2+2] = E[nl2+3] = PE; // 12, 13, 14, 15 FILT4(PE, PI, PH, PF, PG, PC, PD, PB, PA, G5, C4, G0, D0, C1, B1, F4, I4, H5, I5, A0, A1, nl2+3, nl2+2, nl1+3, 3, nl+3, nl1+2, nl2+1, nl2, nl1+1, nl+2, 2, 1, nl+1, nl1, nl, 0); FILT4(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, 3, nl+3, 2, 0, 1, nl+2, nl1+3, nl2+3, nl1+2, nl+1, nl, nl1, nl1+1, nl2+2, nl2+1, nl2); FILT4(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, 0, 1, nl, nl2, nl1, nl+1, 2, 3, nl+2, nl1+1, nl2+1, nl2+2, nl1+2, nl+3, nl1+3, nl2+3); FILT4(PE, PG, PD, PH, PA, PI, PB, PF, PC, A0, I5, A1, B1, I4, F4, H5, G5, D0, G0, C1, C4, nl2, nl1, nl2+1, nl2+3, nl2+2, nl1+1, nl, 0, nl+1, nl1+2, nl1+3, nl+3, nl+2, 1, 2, 3); } sa0 += 1; sa1 += 1; sa2 += 1; sa3 += 1; sa4 += 1; E += n; } } } #define XBR_FUNC(size) \ static int xbr##size##x(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \ { \ xbr_filter(arg, jobnr, nb_jobs, size); \ return 0; \ } XBR_FUNC(2) XBR_FUNC(3) XBR_FUNC(4) static int config_output(AVFilterLink *outlink) { AVFilterContext *ctx = outlink->src; XBRContext *s = ctx->priv; AVFilterLink *inlink = ctx->inputs[0]; outlink->w = inlink->w * s->n; outlink->h = inlink->h * s->n; return 0; } static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_0RGB32, 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]; XBRContext *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; td.rgbtoyuv = s->rgbtoyuv; ctx->internal->execute(ctx, s->func, &td, NULL, FFMIN(inlink->h, ff_filter_get_nb_threads(ctx))); out->width = outlink->w; out->height = outlink->h; av_frame_free(&in); return ff_filter_frame(outlink, out); } static int init(AVFilterContext *ctx) { XBRContext *s = ctx->priv; static const xbrfunc_t xbrfuncs[] = {xbr2x, xbr3x, xbr4x}; uint32_t c; int bg, rg, g; for (bg = -255; bg < 256; bg++) { for (rg = -255; rg < 256; rg++) { const uint32_t u = (uint32_t)((-169*rg + 500*bg)/1000) + 128; const uint32_t v = (uint32_t)(( 500*rg - 81*bg)/1000) + 128; int startg = FFMAX3(-bg, -rg, 0); int endg = FFMIN3(255-bg, 255-rg, 255); uint32_t y = (uint32_t)(( 299*rg + 1000*startg + 114*bg)/1000); c = bg + (rg<<16) + 0x010101 * startg; for (g = startg; g <= endg; g++) { s->rgbtoyuv[c] = ((y++) << 16) + (u << 8) + v; c+= 0x010101; } } } s->func = xbrfuncs[s->n - 2]; return 0; } static const AVFilterPad xbr_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, }, { NULL } }; static const AVFilterPad xbr_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = config_output, }, { NULL } }; AVFilter ff_vf_xbr = { .name = "xbr", .description = NULL_IF_CONFIG_SMALL("Scale the input using xBR algorithm."), .inputs = xbr_inputs, .outputs = xbr_outputs, .query_formats = query_formats, .priv_size = sizeof(XBRContext), .priv_class = &xbr_class, .init = init, .flags = AVFILTER_FLAG_SLICE_THREADS, };