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/*
* 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 http://www.libretro.com/forums/viewtopic.php?f=6&t=134
* @see https://github.com/yoyofr/iFBA/blob/master/fba_src/src/intf/video/scalers/xbr.cpp
*
* @todo add threading and FATE test
*/
#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "internal.h"
#define RGB_MASK 0x00FFFFFF
#define LB_MASK 0x00FEFEFE
#define RED_BLUE_MASK 0x00FF00FF
#define GREEN_MASK 0x0000FF00
typedef struct {
const AVClass *class;
int n;
uint32_t rgbtoyuv[1<<24];
} XBRContext;
#define OFFSET(x) offsetof(XBRContext, x)
static const AVOption xbr_options[] = {
{ "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 4, },
{ 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
uint32_t yuv1 = r2y[x & 0xffffff];
uint32_t yuv2 = r2y[y & 0xffffff];
return (abs((yuv1 & YMASK) - (yuv2 & YMASK)) >> 16) +
(abs((yuv1 & UMASK) - (yuv2 & UMASK)) >> 8) +
abs((yuv1 & VMASK) - (yuv2 & VMASK));
}
#define ALPHA_BLEND_128_W(dst, src) dst = ((src & LB_MASK) >> 1) + ((dst & LB_MASK) >> 1)
#define ALPHA_BLEND_32_W(dst, src) \
dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
(dst & RED_BLUE_MASK))) >> 3))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
((((src & GREEN_MASK) - (dst & GREEN_MASK))) >> 3))))
#define ALPHA_BLEND_64_W(dst, src) \
dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
(dst & RED_BLUE_MASK))) >> 2))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
((((src & GREEN_MASK) - (dst & GREEN_MASK))) >> 2))))
#define ALPHA_BLEND_192_W(dst, src) \
dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
(dst & RED_BLUE_MASK)) * 3) >> 2))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
((((src & GREEN_MASK) - (dst & GREEN_MASK)) * 3) >> 2))))
#define ALPHA_BLEND_224_W(dst, src) \
dst = ((RED_BLUE_MASK & ((dst & RED_BLUE_MASK) + ((((src & RED_BLUE_MASK) - \
(dst & RED_BLUE_MASK)) * 7) >> 3))) | (GREEN_MASK & ((dst & GREEN_MASK) + \
((((src & GREEN_MASK) - (dst & GREEN_MASK)) * 7) >> 3))))
#define df(A, B) pixel_diff(A, B, r2y)
#define eq(A, B) (df(A, B) < 155)
#define INIT_SRC_DST_POINTERS(level) \
uint32_t *E = (uint32_t *)(output->data[0] + y * output->linesize[0] * (level)); \
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; \
} \
}
#define INIT_21_PIXELS \
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];
#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 && (!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; \
const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \
if (left && up) { \
ALPHA_BLEND_224_W(E[N3], px); \
ALPHA_BLEND_64_W( E[N2], px); \
E[N1] = E[N2]; \
} else if (left) { \
ALPHA_BLEND_192_W(E[N3], px); \
ALPHA_BLEND_64_W( E[N2], px); \
} else if (up) { \
ALPHA_BLEND_192_W(E[N3], px); \
ALPHA_BLEND_64_W( E[N1], px); \
} else { /* diagonal */ \
ALPHA_BLEND_128_W(E[N3], px); \
} \
} else if (e <= i) { \
ALPHA_BLEND_128_W( E[N3], ((df(PE,PF) <= df(PE,PH)) ? PF : PH)); \
} \
} \
} while (0)
static void xbr2x(AVFrame * input, AVFrame * output, const uint32_t * r2y)
{
int x,y;
int next_line = output->linesize[0]>>2;
for (y = 0; y < input->height; y++) {
INIT_SRC_DST_POINTERS(2)
for (x = 0; x < input->width; x++) {
INIT_21_PIXELS
E[0] = E[1] = E[next_line] = E[next_line + 1] = PE; // 0, 1, 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, next_line, next_line+1);
FILT2(PE, PC, PF, PB, PI, PA, PH, PD, PG, I4, A1, I5, H5, A0, D0, B1, C1, F4, C4, G5, G0, next_line, 0, next_line+1, 1);
FILT2(PE, PA, PB, PD, PC, PG, PF, PH, PI, C1, G0, C4, F4, G5, H5, D0, A0, B1, A1, I4, I5, next_line+1, next_line, 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, next_line+1, 0, next_line);
sa0 += 1;
sa1 += 1;
sa2 += 1;
sa3 += 1;
sa4 += 1;
E += 2;
}
}
}
#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 && (!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; \
const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \
if (left && up) { \
ALPHA_BLEND_192_W(E[N7], px); \
ALPHA_BLEND_64_W( E[N6], px); \
E[N5] = E[N7]; \
E[N2] = E[N6]; \
E[N8] = px; \
} else if (left) { \
ALPHA_BLEND_192_W(E[N7], px); \
ALPHA_BLEND_64_W( E[N5], px); \
ALPHA_BLEND_64_W( E[N6], px); \
E[N8] = px; \
} else if (up) { \
ALPHA_BLEND_192_W(E[N5], px); \
ALPHA_BLEND_64_W( E[N7], px); \
ALPHA_BLEND_64_W( E[N2], px); \
E[N8] = px; \
} else { /* diagonal */ \
ALPHA_BLEND_224_W(E[N8], px); \
ALPHA_BLEND_32_W( E[N5], px); \
ALPHA_BLEND_32_W( E[N7], px); \
} \
} else if (e <= i) { \
ALPHA_BLEND_128_W(E[N8], ((df(PE,PF) <= df(PE,PH)) ? PF : PH)); \
} \
} \
} while (0)
static void xbr3x(AVFrame *input, AVFrame *output, const uint32_t *r2y)
{
const int nl = output->linesize[0]>>2;
const int nl1 = nl + nl;
int x,y;
for (y = 0; y < input->height; y++) {
INIT_SRC_DST_POINTERS(3)
for (x = 0; x < input->width; x++){
INIT_21_PIXELS
E[0] = E[1] = E[2] = PE;
E[nl] = E[nl+1] = E[nl+2] = PE; // 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);
sa0 += 1;
sa1 += 1;
sa2 += 1;
sa3 += 1;
sa4 += 1;
E += 3;
}
}
}
#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 && (!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; \
const unsigned px = df(PE,PF) <= df(PE,PH) ? PF : PH; \
if (left && up) { \
ALPHA_BLEND_192_W(E[N13], px); \
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) { \
ALPHA_BLEND_192_W(E[N11], px); \
ALPHA_BLEND_192_W(E[N13], px); \
ALPHA_BLEND_64_W( E[N10], px); \
ALPHA_BLEND_64_W( E[N12], px); \
E[N14] = px; \
E[N15] = px; \
} else if (up) { \
ALPHA_BLEND_192_W(E[N14], px); \
ALPHA_BLEND_192_W(E[N7 ], px); \
ALPHA_BLEND_64_W( E[N10], px); \
ALPHA_BLEND_64_W( E[N3 ], px); \
E[N11] = px; \
E[N15] = px; \
} else { /* diagonal */ \
ALPHA_BLEND_128_W(E[N11], px); \
ALPHA_BLEND_128_W(E[N14], px); \
E[N15] = px; \
} \
} else if (e <= i) { \
ALPHA_BLEND_128_W( E[N15], ((df(PE,PF) <= df(PE,PH)) ? PF : PH)); \
} \
} \
} while (0)
static void xbr4x(AVFrame *input, AVFrame *output, const uint32_t *r2y)
{
const int nl = output->linesize[0]>>2;
const int nl1 = nl + nl;
const int nl2 = nl1 + nl;
int x, y;
for (y = 0; y < input->height; y++) {
INIT_SRC_DST_POINTERS(4)
for (x = 0; x < input->width; x++) {
INIT_21_PIXELS
E[0] = E[1] = E[2] = E[3] = PE;
E[nl] = E[nl+1] = E[nl+2] = E[nl+3] = PE; // 4, 5, 6, 7
E[nl1] = E[nl1+1] = E[nl1+2] = E[nl1+3] = PE; // 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 += 4;
}
}
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
XBRContext *xbr = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
outlink->w = inlink->w * xbr->n;
outlink->h = inlink->h * xbr->n;
return 0;
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_0RGB32, AV_PIX_FMT_NONE,
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
XBRContext *xbr = ctx->priv;
const uint32_t *r2y = xbr->rgbtoyuv;
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);
if (xbr->n == 4)
xbr4x(in, out, r2y);
else if (xbr->n == 3)
xbr3x(in, out, r2y);
else
xbr2x(in, out, r2y);
out->width = outlink->w;
out->height = outlink->h;
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static int init(AVFilterContext *ctx)
{
XBRContext *xbr = ctx->priv;
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++) {
xbr->rgbtoyuv[c] = ((y++) << 16) + (u << 8) + v;
c+= 0x010101;
}
}
}
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,
};
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