yading@11: /*
yading@11:  * Copyright (c) 2010 Niel van der Westhuizen <nielkie@gmail.com>
yading@11:  * Copyright (c) 2002 A'rpi
yading@11:  * Copyright (c) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or modify
yading@11:  * it under the terms of the GNU General Public License as published by
yading@11:  * the Free Software Foundation; either version 2 of the License, or
yading@11:  * (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
yading@11:  * GNU General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU General Public License along
yading@11:  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
yading@11:  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Super 2xSaI video filter
yading@11:  * Ported from MPlayer libmpcodecs/vf_2xsai.c.
yading@11:  */
yading@11: 
yading@11: #include "libavutil/pixdesc.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avfilter.h"
yading@11: #include "formats.h"
yading@11: #include "internal.h"
yading@11: #include "video.h"
yading@11: 
yading@11: typedef struct {
yading@11:     /* masks used for two pixels interpolation */
yading@11:     uint32_t hi_pixel_mask;
yading@11:     uint32_t lo_pixel_mask;
yading@11: 
yading@11:     /* masks used for four pixels interpolation */
yading@11:     uint32_t q_hi_pixel_mask;
yading@11:     uint32_t q_lo_pixel_mask;
yading@11: 
yading@11:     int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel
yading@11:     int is_be;
yading@11: } Super2xSaIContext;
yading@11: 
yading@11: #define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))
yading@11: 
yading@11: #define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))
yading@11: 
yading@11: #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) \
yading@11:     + ((((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)
yading@11: 
yading@11: static void super2xsai(AVFilterContext *ctx,
yading@11:                        uint8_t *src, int src_linesize,
yading@11:                        uint8_t *dst, int dst_linesize,
yading@11:                        int width, int height)
yading@11: {
yading@11:     Super2xSaIContext *sai = ctx->priv;
yading@11:     unsigned int x, y;
yading@11:     uint32_t color[4][4];
yading@11:     unsigned char *src_line[4];
yading@11:     const int bpp = sai->bpp;
yading@11:     const uint32_t hi_pixel_mask = sai->hi_pixel_mask;
yading@11:     const uint32_t lo_pixel_mask = sai->lo_pixel_mask;
yading@11:     const uint32_t q_hi_pixel_mask = sai->q_hi_pixel_mask;
yading@11:     const uint32_t q_lo_pixel_mask = sai->q_lo_pixel_mask;
yading@11: 
yading@11:     /* Point to the first 4 lines, first line is duplicated */
yading@11:     src_line[0] = src;
yading@11:     src_line[1] = src;
yading@11:     src_line[2] = src + src_linesize*FFMIN(1, height-1);
yading@11:     src_line[3] = src + src_linesize*FFMIN(2, height-1);
yading@11: 
yading@11: #define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off)
yading@11: #define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off)
yading@11: #define READ_COLOR2(dst, src_line, off) dst = sai->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off)
yading@11: 
yading@11:     for (y = 0; y < height; y++) {
yading@11:         uint8_t *dst_line[2];
yading@11: 
yading@11:         dst_line[0] = dst + dst_linesize*2*y;
yading@11:         dst_line[1] = dst + dst_linesize*(2*y+1);
yading@11: 
yading@11:         switch (bpp) {
yading@11:         case 4:
yading@11:             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);
yading@11:             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);
yading@11:             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);
yading@11:             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);
yading@11:             break;
yading@11:         case 3:
yading@11:             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);
yading@11:             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);
yading@11:             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);
yading@11:             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);
yading@11:             break;
yading@11:         default:
yading@11:             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);
yading@11:             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);
yading@11:             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);
yading@11:             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);
yading@11:         }
yading@11: 
yading@11:         for (x = 0; x < width; x++) {
yading@11:             uint32_t product1a, product1b, product2a, product2b;
yading@11: 
yading@11: //---------------------------------------  B0 B1 B2 B3    0  1  2  3
yading@11: //                                         4  5* 6  S2 -> 4  5* 6  7
yading@11: //                                         1  2  3  S1    8  9 10 11
yading@11: //                                         A0 A1 A2 A3   12 13 14 15
yading@11: //--------------------------------------
yading@11:             if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) {
yading@11:                 product2b = color[2][1];
yading@11:                 product1b = product2b;
yading@11:             } else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) {
yading@11:                 product2b = color[1][1];
yading@11:                 product1b = product2b;
yading@11:             } else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) {
yading@11:                 int r = 0;
yading@11: 
yading@11:                 r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]);
yading@11:                 r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]);
yading@11:                 r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]);
yading@11:                 r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]);
yading@11: 
yading@11:                 if (r > 0)
yading@11:                     product1b = color[1][2];
yading@11:                 else if (r < 0)
yading@11:                     product1b = color[1][1];
yading@11:                 else
yading@11:                     product1b = INTERPOLATE(color[1][1], color[1][2]);
yading@11: 
yading@11:                 product2b = product1b;
yading@11:             } else {
yading@11:                 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])
yading@11:                     product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]);
yading@11:                 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])
yading@11:                     product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]);
yading@11:                 else
yading@11:                     product2b = INTERPOLATE(color[2][1], color[2][2]);
yading@11: 
yading@11:                 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])
yading@11:                     product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]);
yading@11:                 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])
yading@11:                     product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]);
yading@11:                 else
yading@11:                     product1b = INTERPOLATE(color[1][1], color[1][2]);
yading@11:             }
yading@11: 
yading@11:             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])
yading@11:                 product2a = INTERPOLATE(color[2][1], color[1][1]);
yading@11:             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])
yading@11:                 product2a = INTERPOLATE(color[2][1], color[1][1]);
yading@11:             else
yading@11:                 product2a = color[2][1];
yading@11: 
yading@11:             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])
yading@11:                 product1a = INTERPOLATE(color[2][1], color[1][1]);
yading@11:             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])
yading@11:                 product1a = INTERPOLATE(color[2][1], color[1][1]);
yading@11:             else
yading@11:                 product1a = color[1][1];
yading@11: 
yading@11:             /* Set the calculated pixels */
yading@11:             switch (bpp) {
yading@11:             case 4:
yading@11:                 AV_WN32A(dst_line[0] + x * 8,     product1a);
yading@11:                 AV_WN32A(dst_line[0] + x * 8 + 4, product1b);
yading@11:                 AV_WN32A(dst_line[1] + x * 8,     product2a);
yading@11:                 AV_WN32A(dst_line[1] + x * 8 + 4, product2b);
yading@11:                 break;
yading@11:             case 3:
yading@11:                 AV_WL24(dst_line[0] + x * 6,     product1a);
yading@11:                 AV_WL24(dst_line[0] + x * 6 + 3, product1b);
yading@11:                 AV_WL24(dst_line[1] + x * 6,     product2a);
yading@11:                 AV_WL24(dst_line[1] + x * 6 + 3, product2b);
yading@11:                 break;
yading@11:             default: // bpp = 2
yading@11:                 if (sai->is_be) {
yading@11:                     AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16));
yading@11:                     AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16));
yading@11:                 } else {
yading@11:                     AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16));
yading@11:                     AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16));
yading@11:                 }
yading@11:             }
yading@11: 
yading@11:             /* Move color matrix forward */
yading@11:             color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3];
yading@11:             color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3];
yading@11:             color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3];
yading@11:             color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3];
yading@11: 
yading@11:             if (x < width - 3) {
yading@11:                 x += 3;
yading@11:                 switch (bpp) {
yading@11:                 case 4:
yading@11:                     READ_COLOR4(color[0][3], src_line[0], x);
yading@11:                     READ_COLOR4(color[1][3], src_line[1], x);
yading@11:                     READ_COLOR4(color[2][3], src_line[2], x);
yading@11:                     READ_COLOR4(color[3][3], src_line[3], x);
yading@11:                     break;
yading@11:                 case 3:
yading@11:                     READ_COLOR3(color[0][3], src_line[0], x);
yading@11:                     READ_COLOR3(color[1][3], src_line[1], x);
yading@11:                     READ_COLOR3(color[2][3], src_line[2], x);
yading@11:                     READ_COLOR3(color[3][3], src_line[3], x);
yading@11:                     break;
yading@11:                 default:        /* case 2 */
yading@11:                     READ_COLOR2(color[0][3], src_line[0], x);
yading@11:                     READ_COLOR2(color[1][3], src_line[1], x);
yading@11:                     READ_COLOR2(color[2][3], src_line[2], x);
yading@11:                     READ_COLOR2(color[3][3], src_line[3], x);
yading@11:                 }
yading@11:                 x -= 3;
yading@11:             }
yading@11:         }
yading@11: 
yading@11:         /* We're done with one line, so we shift the source lines up */
yading@11:         src_line[0] = src_line[1];
yading@11:         src_line[1] = src_line[2];
yading@11:         src_line[2] = src_line[3];
yading@11: 
yading@11:         /* Read next line */
yading@11:         src_line[3] = src_line[2];
yading@11:         if (y < height - 3)
yading@11:             src_line[3] += src_linesize;
yading@11:     } // y loop
yading@11: }
yading@11: 
yading@11: static int query_formats(AVFilterContext *ctx)
yading@11: {
yading@11:     static const enum AVPixelFormat pix_fmts[] = {
yading@11:         AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,
yading@11:         AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
yading@11:         AV_PIX_FMT_RGB565BE, AV_PIX_FMT_BGR565BE, AV_PIX_FMT_RGB555BE, AV_PIX_FMT_BGR555BE,
yading@11:         AV_PIX_FMT_RGB565LE, AV_PIX_FMT_BGR565LE, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_BGR555LE,
yading@11:         AV_PIX_FMT_NONE
yading@11:     };
yading@11: 
yading@11:     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int config_input(AVFilterLink *inlink)
yading@11: {
yading@11:     Super2xSaIContext *sai = inlink->dst->priv;
yading@11: 
yading@11:     sai->hi_pixel_mask   = 0xFEFEFEFE;
yading@11:     sai->lo_pixel_mask   = 0x01010101;
yading@11:     sai->q_hi_pixel_mask = 0xFCFCFCFC;
yading@11:     sai->q_lo_pixel_mask = 0x03030303;
yading@11:     sai->bpp  = 4;
yading@11: 
yading@11:     switch (inlink->format) {
yading@11:     case AV_PIX_FMT_RGB24:
yading@11:     case AV_PIX_FMT_BGR24:
yading@11:         sai->bpp = 3;
yading@11:         break;
yading@11: 
yading@11:     case AV_PIX_FMT_RGB565BE:
yading@11:     case AV_PIX_FMT_BGR565BE:
yading@11:         sai->is_be = 1;
yading@11:     case AV_PIX_FMT_RGB565LE:
yading@11:     case AV_PIX_FMT_BGR565LE:
yading@11:         sai->hi_pixel_mask   = 0xF7DEF7DE;
yading@11:         sai->lo_pixel_mask   = 0x08210821;
yading@11:         sai->q_hi_pixel_mask = 0xE79CE79C;
yading@11:         sai->q_lo_pixel_mask = 0x18631863;
yading@11:         sai->bpp = 2;
yading@11:         break;
yading@11: 
yading@11:     case AV_PIX_FMT_BGR555BE:
yading@11:     case AV_PIX_FMT_RGB555BE:
yading@11:         sai->is_be = 1;
yading@11:     case AV_PIX_FMT_BGR555LE:
yading@11:     case AV_PIX_FMT_RGB555LE:
yading@11:         sai->hi_pixel_mask   = 0x7BDE7BDE;
yading@11:         sai->lo_pixel_mask   = 0x04210421;
yading@11:         sai->q_hi_pixel_mask = 0x739C739C;
yading@11:         sai->q_lo_pixel_mask = 0x0C630C63;
yading@11:         sai->bpp = 2;
yading@11:         break;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int config_output(AVFilterLink *outlink)
yading@11: {
yading@11:     AVFilterLink *inlink = outlink->src->inputs[0];
yading@11: 
yading@11:     outlink->w = inlink->w*2;
yading@11:     outlink->h = inlink->h*2;
yading@11: 
yading@11:     av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n",
yading@11:            av_get_pix_fmt_name(inlink->format),
yading@11:            inlink->w, inlink->h, outlink->w, outlink->h);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
yading@11: {
yading@11:     AVFilterLink *outlink = inlink->dst->outputs[0];
yading@11:     AVFrame *outpicref = ff_get_video_buffer(outlink, outlink->w, outlink->h);
yading@11:     if (!outpicref) {
yading@11:         av_frame_free(&inpicref);
yading@11:         return AVERROR(ENOMEM);
yading@11:     }
yading@11:     av_frame_copy_props(outpicref, inpicref);
yading@11:     outpicref->width  = outlink->w;
yading@11:     outpicref->height = outlink->h;
yading@11: 
yading@11:     super2xsai(inlink->dst, inpicref->data[0], inpicref->linesize[0],
yading@11:                outpicref->data[0], outpicref->linesize[0],
yading@11:                inlink->w, inlink->h);
yading@11: 
yading@11:     av_frame_free(&inpicref);
yading@11:     return ff_filter_frame(outlink, outpicref);
yading@11: }
yading@11: 
yading@11: static const AVFilterPad super2xsai_inputs[] = {
yading@11:     {
yading@11:         .name         = "default",
yading@11:         .type         = AVMEDIA_TYPE_VIDEO,
yading@11:         .config_props = config_input,
yading@11:         .filter_frame = filter_frame,
yading@11:     },
yading@11:     { NULL }
yading@11: };
yading@11: 
yading@11: static const AVFilterPad super2xsai_outputs[] = {
yading@11:     {
yading@11:         .name         = "default",
yading@11:         .type         = AVMEDIA_TYPE_VIDEO,
yading@11:         .config_props = config_output,
yading@11:     },
yading@11:     { NULL }
yading@11: };
yading@11: 
yading@11: AVFilter avfilter_vf_super2xsai = {
yading@11:     .name        = "super2xsai",
yading@11:     .description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
yading@11:     .priv_size   = sizeof(Super2xSaIContext),
yading@11:     .query_formats = query_formats,
yading@11:     .inputs        = super2xsai_inputs,
yading@11:     .outputs       = super2xsai_outputs,
yading@11: };