345 lines
15 KiB
C
345 lines
15 KiB
C
/*
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* Copyright (c) 2010 Niel van der Westhuizen <nielkie@gmail.com>
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* Copyright (c) 2002 A'rpi
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* Copyright (c) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* @file
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* Super 2xSaI video filter
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* Ported from MPlayer libmpcodecs/vf_2xsai.c.
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*/
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#include "libavutil/pixdesc.h"
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#include "libavutil/intreadwrite.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "video.h"
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typedef struct {
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/* masks used for two pixels interpolation */
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uint32_t hi_pixel_mask;
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uint32_t lo_pixel_mask;
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/* masks used for four pixels interpolation */
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uint32_t q_hi_pixel_mask;
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uint32_t q_lo_pixel_mask;
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int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel
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int is_be;
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} Super2xSaIContext;
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#define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))
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#define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))
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#define Q_INTERPOLATE(A, B, C, D) ((A & q_hi_pixel_mask) >> 2) + ((B & q_hi_pixel_mask) >> 2) + ((C & q_hi_pixel_mask) >> 2) + ((D & q_hi_pixel_mask) >> 2) \
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+ ((((A & q_lo_pixel_mask) + (B & q_lo_pixel_mask) + (C & q_lo_pixel_mask) + (D & q_lo_pixel_mask)) >> 2) & q_lo_pixel_mask)
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static void super2xsai(AVFilterContext *ctx,
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uint8_t *src, int src_linesize,
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uint8_t *dst, int dst_linesize,
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int width, int height)
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{
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Super2xSaIContext *sai = ctx->priv;
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unsigned int x, y;
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uint32_t color[4][4];
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unsigned char *src_line[4];
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const int bpp = sai->bpp;
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const uint32_t hi_pixel_mask = sai->hi_pixel_mask;
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const uint32_t lo_pixel_mask = sai->lo_pixel_mask;
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const uint32_t q_hi_pixel_mask = sai->q_hi_pixel_mask;
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const uint32_t q_lo_pixel_mask = sai->q_lo_pixel_mask;
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/* Point to the first 4 lines, first line is duplicated */
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src_line[0] = src;
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src_line[1] = src;
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src_line[2] = src + src_linesize*FFMIN(1, height-1);
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src_line[3] = src + src_linesize*FFMIN(2, height-1);
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#define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off)
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#define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off)
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#define READ_COLOR2(dst, src_line, off) dst = sai->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off)
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for (y = 0; y < height; y++) {
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uint8_t *dst_line[2];
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dst_line[0] = dst + dst_linesize*2*y;
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dst_line[1] = dst + dst_linesize*(2*y+1);
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switch (bpp) {
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case 4:
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READ_COLOR4(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR4(color[0][2], src_line[0], 1); READ_COLOR4(color[0][3], src_line[0], 2);
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READ_COLOR4(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR4(color[1][2], src_line[1], 1); READ_COLOR4(color[1][3], src_line[1], 2);
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READ_COLOR4(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR4(color[2][2], src_line[2], 1); READ_COLOR4(color[2][3], src_line[2], 2);
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READ_COLOR4(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR4(color[3][2], src_line[3], 1); READ_COLOR4(color[3][3], src_line[3], 2);
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break;
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case 3:
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READ_COLOR3(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR3(color[0][2], src_line[0], 1); READ_COLOR3(color[0][3], src_line[0], 2);
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READ_COLOR3(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR3(color[1][2], src_line[1], 1); READ_COLOR3(color[1][3], src_line[1], 2);
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READ_COLOR3(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR3(color[2][2], src_line[2], 1); READ_COLOR3(color[2][3], src_line[2], 2);
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READ_COLOR3(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR3(color[3][2], src_line[3], 1); READ_COLOR3(color[3][3], src_line[3], 2);
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break;
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default:
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READ_COLOR2(color[0][0], src_line[0], 0); color[0][1] = color[0][0]; READ_COLOR2(color[0][2], src_line[0], 1); READ_COLOR2(color[0][3], src_line[0], 2);
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READ_COLOR2(color[1][0], src_line[1], 0); color[1][1] = color[1][0]; READ_COLOR2(color[1][2], src_line[1], 1); READ_COLOR2(color[1][3], src_line[1], 2);
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READ_COLOR2(color[2][0], src_line[2], 0); color[2][1] = color[2][0]; READ_COLOR2(color[2][2], src_line[2], 1); READ_COLOR2(color[2][3], src_line[2], 2);
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READ_COLOR2(color[3][0], src_line[3], 0); color[3][1] = color[3][0]; READ_COLOR2(color[3][2], src_line[3], 1); READ_COLOR2(color[3][3], src_line[3], 2);
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}
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for (x = 0; x < width; x++) {
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uint32_t product1a, product1b, product2a, product2b;
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//--------------------------------------- B0 B1 B2 B3 0 1 2 3
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// 4 5* 6 S2 -> 4 5* 6 7
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// 1 2 3 S1 8 9 10 11
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// A0 A1 A2 A3 12 13 14 15
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//--------------------------------------
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if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) {
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product2b = color[2][1];
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product1b = product2b;
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} else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) {
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product2b = color[1][1];
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product1b = product2b;
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} else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) {
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int r = 0;
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r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]);
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r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]);
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r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]);
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r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]);
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if (r > 0)
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product1b = color[1][2];
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else if (r < 0)
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product1b = color[1][1];
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else
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product1b = INTERPOLATE(color[1][1], color[1][2]);
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product2b = product1b;
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} else {
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if (color[1][2] == color[2][2] && color[2][2] == color[3][1] && color[2][1] != color[3][2] && color[2][2] != color[3][0])
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product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]);
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else if (color[1][1] == color[2][1] && color[2][1] == color[3][2] && color[3][1] != color[2][2] && color[2][1] != color[3][3])
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product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]);
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else
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product2b = INTERPOLATE(color[2][1], color[2][2]);
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if (color[1][2] == color[2][2] && color[1][2] == color[0][1] && color[1][1] != color[0][2] && color[1][2] != color[0][0])
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product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]);
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else if (color[1][1] == color[2][1] && color[1][1] == color[0][2] && color[0][1] != color[1][2] && color[1][1] != color[0][3])
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product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]);
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else
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product1b = INTERPOLATE(color[1][1], color[1][2]);
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}
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if (color[1][1] == color[2][2] && color[2][1] != color[1][2] && color[1][0] == color[1][1] && color[1][1] != color[3][2])
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product2a = INTERPOLATE(color[2][1], color[1][1]);
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else if (color[1][1] == color[2][0] && color[1][2] == color[1][1] && color[1][0] != color[2][1] && color[1][1] != color[3][0])
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product2a = INTERPOLATE(color[2][1], color[1][1]);
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else
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product2a = color[2][1];
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if (color[2][1] == color[1][2] && color[1][1] != color[2][2] && color[2][0] == color[2][1] && color[2][1] != color[0][2])
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product1a = INTERPOLATE(color[2][1], color[1][1]);
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else if (color[1][0] == color[2][1] && color[2][2] == color[2][1] && color[2][0] != color[1][1] && color[2][1] != color[0][0])
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product1a = INTERPOLATE(color[2][1], color[1][1]);
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else
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product1a = color[1][1];
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/* Set the calculated pixels */
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switch (bpp) {
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case 4:
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AV_WN32A(dst_line[0] + x * 8, product1a);
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AV_WN32A(dst_line[0] + x * 8 + 4, product1b);
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AV_WN32A(dst_line[1] + x * 8, product2a);
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AV_WN32A(dst_line[1] + x * 8 + 4, product2b);
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break;
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case 3:
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AV_WL24(dst_line[0] + x * 6, product1a);
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AV_WL24(dst_line[0] + x * 6 + 3, product1b);
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AV_WL24(dst_line[1] + x * 6, product2a);
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AV_WL24(dst_line[1] + x * 6 + 3, product2b);
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break;
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default: // bpp = 2
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if (sai->is_be) {
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AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16));
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AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16));
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} else {
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AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16));
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AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16));
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}
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}
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/* Move color matrix forward */
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color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3];
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color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3];
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color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3];
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color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3];
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if (x < width - 3) {
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x += 3;
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switch (bpp) {
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case 4:
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READ_COLOR4(color[0][3], src_line[0], x);
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READ_COLOR4(color[1][3], src_line[1], x);
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READ_COLOR4(color[2][3], src_line[2], x);
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READ_COLOR4(color[3][3], src_line[3], x);
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break;
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case 3:
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READ_COLOR3(color[0][3], src_line[0], x);
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READ_COLOR3(color[1][3], src_line[1], x);
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READ_COLOR3(color[2][3], src_line[2], x);
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READ_COLOR3(color[3][3], src_line[3], x);
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break;
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default: /* case 2 */
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READ_COLOR2(color[0][3], src_line[0], x);
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READ_COLOR2(color[1][3], src_line[1], x);
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READ_COLOR2(color[2][3], src_line[2], x);
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READ_COLOR2(color[3][3], src_line[3], x);
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}
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x -= 3;
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}
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}
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/* We're done with one line, so we shift the source lines up */
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src_line[0] = src_line[1];
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src_line[1] = src_line[2];
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src_line[2] = src_line[3];
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/* Read next line */
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src_line[3] = src_line[2];
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if (y < height - 3)
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src_line[3] += src_linesize;
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} // y loop
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}
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum PixelFormat pix_fmts[] = {
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PIX_FMT_RGBA, PIX_FMT_BGRA, PIX_FMT_ARGB, PIX_FMT_ABGR,
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PIX_FMT_RGB24, PIX_FMT_BGR24,
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PIX_FMT_RGB565BE, PIX_FMT_BGR565BE, PIX_FMT_RGB555BE, PIX_FMT_BGR555BE,
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PIX_FMT_RGB565LE, PIX_FMT_BGR565LE, PIX_FMT_RGB555LE, PIX_FMT_BGR555LE,
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PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_input(AVFilterLink *inlink)
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{
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Super2xSaIContext *sai = inlink->dst->priv;
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sai->hi_pixel_mask = 0xFEFEFEFE;
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sai->lo_pixel_mask = 0x01010101;
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sai->q_hi_pixel_mask = 0xFCFCFCFC;
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sai->q_lo_pixel_mask = 0x03030303;
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sai->bpp = 4;
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switch (inlink->format) {
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case PIX_FMT_RGB24:
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case PIX_FMT_BGR24:
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sai->bpp = 3;
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break;
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case PIX_FMT_RGB565BE:
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case PIX_FMT_BGR565BE:
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sai->is_be = 1;
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case PIX_FMT_RGB565LE:
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case PIX_FMT_BGR565LE:
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sai->hi_pixel_mask = 0xF7DEF7DE;
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sai->lo_pixel_mask = 0x08210821;
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sai->q_hi_pixel_mask = 0xE79CE79C;
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sai->q_lo_pixel_mask = 0x18631863;
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sai->bpp = 2;
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break;
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case PIX_FMT_BGR555BE:
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case PIX_FMT_RGB555BE:
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sai->is_be = 1;
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case PIX_FMT_BGR555LE:
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case PIX_FMT_RGB555LE:
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sai->hi_pixel_mask = 0x7BDE7BDE;
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sai->lo_pixel_mask = 0x04210421;
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sai->q_hi_pixel_mask = 0x739C739C;
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sai->q_lo_pixel_mask = 0x0C630C63;
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sai->bpp = 2;
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break;
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}
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return 0;
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterLink *inlink = outlink->src->inputs[0];
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outlink->w = inlink->w*2;
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outlink->h = inlink->h*2;
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av_log(inlink->dst, AV_LOG_INFO, "fmt:%s size:%dx%d -> size:%dx%d\n",
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av_get_pix_fmt_name(inlink->format),
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inlink->w, inlink->h, outlink->w, outlink->h);
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return 0;
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}
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static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
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static void end_frame(AVFilterLink *inlink)
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{
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *inpicref = inlink->cur_buf;
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AVFilterBufferRef *outpicref = outlink->out_buf;
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super2xsai(inlink->dst, inpicref->data[0], inpicref->linesize[0],
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outpicref->data[0], outpicref->linesize[0],
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inlink->w, inlink->h);
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avfilter_unref_buffer(inpicref);
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ff_draw_slice(outlink, 0, outlink->h, 1);
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ff_end_frame(outlink);
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avfilter_unref_buffer(outpicref);
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}
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AVFilter avfilter_vf_super2xsai = {
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.name = "super2xsai",
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.description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
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.priv_size = sizeof(Super2xSaIContext),
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.query_formats = query_formats,
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.inputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_input,
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.draw_slice = null_draw_slice,
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.end_frame = end_frame,
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.min_perms = AV_PERM_READ },
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{ .name = NULL }
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},
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.outputs = (const AVFilterPad[]) {
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{ .name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output },
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{ .name = NULL }
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},
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};
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