FFmpeg: libavfilter/vf_super2xsai.c Source File

00001 /*
00002  * Copyright (c) 2010 Niel van der Westhuizen <nielkie@gmail.com>
00003  * Copyright (c) 2002 A'rpi
00004  * Copyright (c) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or modify
00009  * it under the terms of the GNU General Public License as published by
00010  * the Free Software Foundation; either version 2 of the License, or
00011  * (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016  * GNU General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU General Public License along
00019  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
00020  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00021  */
00022 
00029 #include "libavutil/pixdesc.h"
00030 #include "libavutil/intreadwrite.h"
00031 #include "avfilter.h"
00032 
00033 typedef struct {
00034     /* masks used for two pixels interpolation */
00035     uint32_t hi_pixel_mask;
00036     uint32_t lo_pixel_mask;
00037 
00038     /* masks used for four pixels interpolation */
00039     uint32_t q_hi_pixel_mask;
00040     uint32_t q_lo_pixel_mask;
00041 
00042     int bpp; 
00043 } Super2xSaIContext;
00044 
00045 #define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))
00046 
00047 #define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))
00048 
00049 #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) \
00050     + ((((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)
00051 
00052 static void super2xsai(AVFilterContext *ctx,
00053                        uint8_t *src, int src_linesize,
00054                        uint8_t *dst, int dst_linesize,
00055                        int width, int height)
00056 {
00057     Super2xSaIContext *sai = ctx->priv;
00058     unsigned int x, y;
00059     uint32_t color[4][4];
00060     unsigned char *src_line[4];
00061     const int bpp = sai->bpp;
00062     const uint32_t hi_pixel_mask = sai->hi_pixel_mask;
00063     const uint32_t lo_pixel_mask = sai->lo_pixel_mask;
00064     const uint32_t q_hi_pixel_mask = sai->q_hi_pixel_mask;
00065     const uint32_t q_lo_pixel_mask = sai->q_lo_pixel_mask;
00066 
00067     /* Point to the first 4 lines, first line is duplicated */
00068     src_line[0] = src;
00069     src_line[1] = src;
00070     src_line[2] = src + src_linesize*FFMIN(1, height-1);
00071     src_line[3] = src + src_linesize*FFMIN(2, height-1);
00072 
00073 #define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off)
00074 #define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off)
00075 #define READ_COLOR2(dst, src_line, off) dst = *((const uint16_t *)src_line + off)
00076 
00077     /* Initialise the color matrix for this row. */
00078     switch (bpp) {
00079     case 4:
00080         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);
00081         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);
00082         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);
00083         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);
00084         break;
00085     case 3:
00086         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);
00087         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);
00088         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);
00089         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);
00090         break;
00091     default:
00092         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);
00093         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);
00094         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);
00095         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);
00096     }
00097 
00098     for (y = 0; y < height; y++) {
00099         uint8_t *dst_line[2];
00100 
00101         dst_line[0] = dst + dst_linesize*2*y;
00102         dst_line[1] = dst + dst_linesize*(2*y+1);
00103 
00104         for (x = 0; x < width; x++) {
00105             uint32_t product1a, product1b, product2a, product2b;
00106 
00107 //---------------------------------------  B0 B1 B2 B3    0  1  2  3
00108 //                                         4  5* 6  S2 -> 4  5* 6  7
00109 //                                         1  2  3  S1    8  9 10 11
00110 //                                         A0 A1 A2 A3   12 13 14 15
00111 //--------------------------------------
00112             if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) {
00113                 product2b = color[2][1];
00114                 product1b = product2b;
00115             } else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) {
00116                 product2b = color[1][1];
00117                 product1b = product2b;
00118             } else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) {
00119                 int r = 0;
00120 
00121                 r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]);
00122                 r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]);
00123                 r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]);
00124                 r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]);
00125 
00126                 if (r > 0)
00127                     product1b = color[1][2];
00128                 else if (r < 0)
00129                     product1b = color[1][1];
00130                 else
00131                     product1b = INTERPOLATE(color[1][1], color[1][2]);
00132 
00133                 product2b = product1b;
00134             } else {
00135                 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])
00136                     product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]);
00137                 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])
00138                     product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]);
00139                 else
00140                     product2b = INTERPOLATE(color[2][1], color[2][2]);
00141 
00142                 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])
00143                     product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]);
00144                 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])
00145                     product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]);
00146                 else
00147                     product1b = INTERPOLATE(color[1][1], color[1][2]);
00148             }
00149 
00150             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])
00151                 product2a = INTERPOLATE(color[2][1], color[1][1]);
00152             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])
00153                 product2a = INTERPOLATE(color[2][1], color[1][1]);
00154             else
00155                 product2a = color[2][1];
00156 
00157             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])
00158                 product1a = INTERPOLATE(color[2][1], color[1][1]);
00159             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])
00160                 product1a = INTERPOLATE(color[2][1], color[1][1]);
00161             else
00162                 product1a = color[1][1];
00163 
00164             /* Set the calculated pixels */
00165             switch (bpp) {
00166             case 4:
00167                 AV_WN32A(dst_line[0] + x * 8,     product1a);
00168                 AV_WN32A(dst_line[0] + x * 8 + 4, product1b);
00169                 AV_WN32A(dst_line[1] + x * 8,     product2a);
00170                 AV_WN32A(dst_line[1] + x * 8 + 4, product2b);
00171                 break;
00172             case 3:
00173                 AV_WL24(dst_line[0] + x * 6,     product1a);
00174                 AV_WL24(dst_line[0] + x * 6 + 3, product1b);
00175                 AV_WL24(dst_line[1] + x * 6,     product2a);
00176                 AV_WL24(dst_line[1] + x * 6 + 3, product2b);
00177                 break;
00178             default: // bpp = 2
00179                 AV_WN32A(dst_line[0] + x * 4, product1a | (product1b << 16));
00180                 AV_WN32A(dst_line[1] + x * 4, product2a | (product2b << 16));
00181             }
00182 
00183             /* Move color matrix forward */
00184             color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3];
00185             color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3];
00186             color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3];
00187             color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3];
00188 
00189             if (x < width - 3) {
00190                 x += 3;
00191                 switch (bpp) {
00192                 case 4:
00193                     READ_COLOR4(color[0][3], src_line[0], x);
00194                     READ_COLOR4(color[1][3], src_line[1], x);
00195                     READ_COLOR4(color[2][3], src_line[2], x);
00196                     READ_COLOR4(color[3][3], src_line[3], x);
00197                     break;
00198                 case 3:
00199                     READ_COLOR3(color[0][3], src_line[0], x);
00200                     READ_COLOR3(color[1][3], src_line[1], x);
00201                     READ_COLOR3(color[2][3], src_line[2], x);
00202                     READ_COLOR3(color[3][3], src_line[3], x);
00203                     break;
00204                 default:        /* case 2 */
00205                     READ_COLOR2(color[0][3], src_line[0], x);
00206                     READ_COLOR2(color[1][3], src_line[1], x);
00207                     READ_COLOR2(color[2][3], src_line[2], x);
00208                     READ_COLOR2(color[3][3], src_line[3], x);
00209                 }
00210                 x -= 3;
00211             }
00212         }
00213 
00214         /* We're done with one line, so we shift the source lines up */
00215         src_line[0] = src_line[1];
00216         src_line[1] = src_line[2];
00217         src_line[2] = src_line[3];
00218 
00219         /* Read next line */
00220         src_line[3] = src_line[2];
00221         if (y < height - 3)
00222             src_line[3] += src_linesize;
00223 
00224         switch (bpp) {
00225         case 4:
00226             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);
00227             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);
00228             READ_COLOR4(color[2][0], src_line[2], 0); color[2][1] = color[2][1]; READ_COLOR4(color[2][2], src_line[2], 1); READ_COLOR4(color[2][3], src_line[2], 2);
00229             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);
00230             break;
00231         case 3:
00232             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);
00233             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);
00234             READ_COLOR3(color[2][0], src_line[2], 0); color[2][1] = color[2][1]; READ_COLOR3(color[2][2], src_line[2], 1); READ_COLOR3(color[2][3], src_line[2], 2);
00235             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);
00236             break;
00237         default:
00238             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);
00239             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);
00240             READ_COLOR2(color[2][0], src_line[2], 0); color[2][1] = color[2][1]; READ_COLOR2(color[2][2], src_line[2], 1); READ_COLOR2(color[2][3], src_line[2], 2);
00241             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);
00242         }
00243     } // y loop
00244 }
00245 
00246 static int query_formats(AVFilterContext *ctx)
00247 {
00248     static const enum PixelFormat pix_fmts[] = {
00249         PIX_FMT_RGBA, PIX_FMT_BGRA, PIX_FMT_ARGB, PIX_FMT_ABGR,
00250         PIX_FMT_RGB24, PIX_FMT_BGR24,
00251         PIX_FMT_RGB565, PIX_FMT_BGR565, PIX_FMT_RGB555, PIX_FMT_BGR555,
00252         PIX_FMT_NONE
00253     };
00254 
00255     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00256     return 0;
00257 }
00258 
00259 static int config_input(AVFilterLink *inlink)
00260 {
00261     Super2xSaIContext *sai = inlink->dst->priv;
00262 
00263     sai->hi_pixel_mask   = 0xFEFEFEFE;
00264     sai->lo_pixel_mask   = 0x01010101;
00265     sai->q_hi_pixel_mask = 0xFCFCFCFC;
00266     sai->q_lo_pixel_mask = 0x03030303;
00267     sai->bpp  = 4;
00268 
00269     switch (inlink->format) {
00270     case PIX_FMT_RGB24:
00271     case PIX_FMT_BGR24:
00272         sai->bpp = 3;
00273         break;
00274 
00275     case PIX_FMT_RGB565:
00276     case PIX_FMT_BGR565:
00277         sai->hi_pixel_mask   = 0xF7DEF7DE;
00278         sai->lo_pixel_mask   = 0x08210821;
00279         sai->q_hi_pixel_mask = 0xE79CE79C;
00280         sai->q_lo_pixel_mask = 0x18631863;
00281         sai->bpp = 2;
00282         break;
00283 
00284     case PIX_FMT_BGR555:
00285     case PIX_FMT_RGB555:
00286         sai->hi_pixel_mask   = 0x7BDE7BDE;
00287         sai->lo_pixel_mask   = 0x04210421;
00288         sai->q_hi_pixel_mask = 0x739C739C;
00289         sai->q_lo_pixel_mask = 0x0C630C63;
00290         sai->bpp = 2;
00291         break;
00292     }
00293 
00294     return 0;
00295 }
00296 
00297 static int config_output(AVFilterLink *outlink)
00298 {
00299     AVFilterLink *inlink = outlink->src->inputs[0];
00300 
00301     outlink->w = inlink->w*2;
00302     outlink->h = inlink->h*2;
00303 
00304     av_log(inlink->dst, AV_LOG_INFO, "fmt:%s size:%dx%d -> size:%dx%d\n",
00305            av_get_pix_fmt_name(inlink->format),
00306            inlink->w, inlink->h, outlink->w, outlink->h);
00307 
00308     return 0;
00309 }
00310 
00311 static void null_draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { }
00312 
00313 static void end_frame(AVFilterLink *inlink)
00314 {
00315     AVFilterLink *outlink = inlink->dst->outputs[0];
00316     AVFilterBufferRef  *inpicref =  inlink->cur_buf;
00317     AVFilterBufferRef *outpicref = outlink->out_buf;
00318 
00319     super2xsai(inlink->dst, inpicref->data[0], inpicref->linesize[0],
00320                outpicref->data[0], outpicref->linesize[0],
00321                inlink->w, inlink->h);
00322 
00323     avfilter_unref_buffer(inpicref);
00324     avfilter_draw_slice(outlink, 0, outlink->h, 1);
00325     avfilter_end_frame(outlink);
00326     avfilter_unref_buffer(outpicref);
00327 }
00328 
00329 AVFilter avfilter_vf_super2xsai = {
00330     .name        = "super2xsai",
00331     .description = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),
00332     .priv_size   = sizeof(Super2xSaIContext),
00333     .query_formats = query_formats,
00334 
00335     .inputs = (const AVFilterPad[]) {
00336         { .name             = "default",
00337           .type             = AVMEDIA_TYPE_VIDEO,
00338           .config_props     = config_input,
00339           .draw_slice       = null_draw_slice,
00340           .end_frame        = end_frame,
00341           .min_perms        = AV_PERM_READ },
00342         { .name = NULL }
00343     },
00344     .outputs = (const AVFilterPad[]) {
00345         { .name             = "default",
00346           .type             = AVMEDIA_TYPE_VIDEO,
00347           .config_props     = config_output },
00348         { .name = NULL }
00349     },
00350 };