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FFmpeg/libavfilter/vf_super2xsai.c

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  1. /*

  2.  * Copyright (c) 2010 Niel van der Westhuizen <nielkie@gmail.com>

  3.  * Copyright (c) 2002 A'rpi

  4.  * Copyright (c) 1997-2001 ZSNES Team ( zsknight@zsnes.com / _demo_@zsnes.com )

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or modify

  9.  * it under the terms of the GNU General Public License as published by

  10.  * the Free Software Foundation; either version 2 of the License, or

  11.  * (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  16.  * GNU General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU General Public License along

  19.  * with FFmpeg; if not, write to the Free Software Foundation, Inc.,

  20.  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * Super 2xSaI video filter

  26.  * Ported from MPlayer libmpcodecs/vf_2xsai.c.

  27.  */

  28. 

  29. #include "libavutil/pixdesc.h"

  30. #include "libavutil/intreadwrite.h"

  31. #include "avfilter.h"

  32. #include "formats.h"

  33. #include "internal.h"

  34. #include "video.h"

  35. 

  36. typedef struct Super2xSaIContext {

  37.     /* masks used for two pixels interpolation */

  38.     uint32_t hi_pixel_mask;

  39.     uint32_t lo_pixel_mask;

  40. 

  41.     /* masks used for four pixels interpolation */

  42.     uint32_t q_hi_pixel_mask;

  43.     uint32_t q_lo_pixel_mask;

  44. 

  45.     int bpp; ///< bytes per pixel, pixel stride for each (packed) pixel

  46.     int is_be;

  47. } Super2xSaIContext;

  48. 

  49. typedef struct ThreadData {

  50.     AVFrame *in, *out;

  51. } ThreadData;

  52. 

  53. #define GET_RESULT(A, B, C, D) ((A != C || A != D) - (B != C || B != D))

  54. 

  55. #define INTERPOLATE(A, B) (((A & hi_pixel_mask) >> 1) + ((B & hi_pixel_mask) >> 1) + (A & B & lo_pixel_mask))

  56. 

  57. #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) \

  58.     + ((((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)

  59. 

  60. static int super2xsai(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

  61. {

  62.     Super2xSaIContext *s = ctx->priv;

  63.     ThreadData *td = arg;

  64.     AVFrame *in = td->in;

  65.     AVFrame *out = td->out;

  66.     const uint8_t *src = in->data[0];

  67.     uint8_t *dst = out->data[0];

  68.     const int src_linesize = in->linesize[0];

  69.     const int dst_linesize = out->linesize[0];

  70.     const int width = in->width;

  71.     const int height = in->height;

  72.     unsigned int x, y;

  73.     uint32_t color[4][4];

  74.     const uint8_t *src_line[4];

  75.     const int bpp = s->bpp;

  76.     const uint32_t hi_pixel_mask = s->hi_pixel_mask;

  77.     const uint32_t lo_pixel_mask = s->lo_pixel_mask;

  78.     const uint32_t q_hi_pixel_mask = s->q_hi_pixel_mask;

  79.     const uint32_t q_lo_pixel_mask = s->q_lo_pixel_mask;

  80.     const int slice_start = (height * jobnr) / nb_jobs;

  81.     const int slice_end = (height * (jobnr+1)) / nb_jobs;

  82. 

  83.     /* Point to the first 4 lines, first line is duplicated */

  84.     src_line[0] = src + src_linesize*FFMAX(slice_start - 1, 0);

  85.     src_line[1] = src + src_linesize*slice_start;

  86.     src_line[2] = src + src_linesize*FFMIN(slice_start + 1, height-1);

  87.     src_line[3] = src + src_linesize*FFMIN(slice_start + 2, height-1);

  88. 

  89. #define READ_COLOR4(dst, src_line, off) dst = *((const uint32_t *)src_line + off)

  90. #define READ_COLOR3(dst, src_line, off) dst = AV_RL24 (src_line + 3*off)

  91. #define READ_COLOR2(dst, src_line, off) dst = s->is_be ? AV_RB16(src_line + 2 * off) : AV_RL16(src_line + 2 * off)

  92. 

  93.     for (y = slice_start; y < slice_end; y++) {

  94.         uint8_t *dst_line[2];

  95. 

  96.         dst_line[0] = dst + dst_linesize*2*y;

  97.         dst_line[1] = dst + dst_linesize*(2*y+1);

  98. 

  99.         switch (bpp) {

  100.         case 4:

  101.             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);

  102.             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);

  103.             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);

  104.             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);

  105.             break;

  106.         case 3:

  107.             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);

  108.             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);

  109.             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);

  110.             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);

  111.             break;

  112.         default:

  113.             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);

  114.             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);

  115.             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);

  116.             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);

  117.         }

  118. 

  119.         for (x = 0; x < width; x++) {

  120.             uint32_t product1a, product1b, product2a, product2b;

  121. 

  122. //---------------------------------------  B0 B1 B2 B3    0  1  2  3

  123. //                                         4  5* 6  S2 -> 4  5* 6  7

  124. //                                         1  2  3  S1    8  9 10 11

  125. //                                         A0 A1 A2 A3   12 13 14 15

  126. //--------------------------------------

  127.             if (color[2][1] == color[1][2] && color[1][1] != color[2][2]) {

  128.                 product2b = color[2][1];

  129.                 product1b = product2b;

  130.             } else if (color[1][1] == color[2][2] && color[2][1] != color[1][2]) {

  131.                 product2b = color[1][1];

  132.                 product1b = product2b;

  133.             } else if (color[1][1] == color[2][2] && color[2][1] == color[1][2]) {

  134.                 int r = 0;

  135. 

  136.                 r += GET_RESULT(color[1][2], color[1][1], color[1][0], color[3][1]);

  137.                 r += GET_RESULT(color[1][2], color[1][1], color[2][0], color[0][1]);

  138.                 r += GET_RESULT(color[1][2], color[1][1], color[3][2], color[2][3]);

  139.                 r += GET_RESULT(color[1][2], color[1][1], color[0][2], color[1][3]);

  140. 

  141.                 if (r > 0)

  142.                     product1b = color[1][2];

  143.                 else if (r < 0)

  144.                     product1b = color[1][1];

  145.                 else

  146.                     product1b = INTERPOLATE(color[1][1], color[1][2]);

  147. 

  148.                 product2b = product1b;

  149.             } else {

  150.                 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])

  151.                     product2b = Q_INTERPOLATE(color[2][2], color[2][2], color[2][2], color[2][1]);

  152.                 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])

  153.                     product2b = Q_INTERPOLATE(color[2][1], color[2][1], color[2][1], color[2][2]);

  154.                 else

  155.                     product2b = INTERPOLATE(color[2][1], color[2][2]);

  156. 

  157.                 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])

  158.                     product1b = Q_INTERPOLATE(color[1][2], color[1][2], color[1][2], color[1][1]);

  159.                 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])

  160.                     product1b = Q_INTERPOLATE(color[1][2], color[1][1], color[1][1], color[1][1]);

  161.                 else

  162.                     product1b = INTERPOLATE(color[1][1], color[1][2]);

  163.             }

  164. 

  165.             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])

  166.                 product2a = INTERPOLATE(color[2][1], color[1][1]);

  167.             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])

  168.                 product2a = INTERPOLATE(color[2][1], color[1][1]);

  169.             else

  170.                 product2a = color[2][1];

  171. 

  172.             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])

  173.                 product1a = INTERPOLATE(color[2][1], color[1][1]);

  174.             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])

  175.                 product1a = INTERPOLATE(color[2][1], color[1][1]);

  176.             else

  177.                 product1a = color[1][1];

  178. 

  179.             /* Set the calculated pixels */

  180.             switch (bpp) {

  181.             case 4:

  182.                 AV_WN32A(dst_line[0] + x * 8,     product1a);

  183.                 AV_WN32A(dst_line[0] + x * 8 + 4, product1b);

  184.                 AV_WN32A(dst_line[1] + x * 8,     product2a);

  185.                 AV_WN32A(dst_line[1] + x * 8 + 4, product2b);

  186.                 break;

  187.             case 3:

  188.                 AV_WL24(dst_line[0] + x * 6,     product1a);

  189.                 AV_WL24(dst_line[0] + x * 6 + 3, product1b);

  190.                 AV_WL24(dst_line[1] + x * 6,     product2a);

  191.                 AV_WL24(dst_line[1] + x * 6 + 3, product2b);

  192.                 break;

  193.             default: // bpp = 2

  194.                 if (s->is_be) {

  195.                     AV_WB32(dst_line[0] + x * 4, product1a | (product1b << 16));

  196.                     AV_WB32(dst_line[1] + x * 4, product2a | (product2b << 16));

  197.                 } else {

  198.                     AV_WL32(dst_line[0] + x * 4, product1a | (product1b << 16));

  199.                     AV_WL32(dst_line[1] + x * 4, product2a | (product2b << 16));

  200.                 }

  201.             }

  202. 

  203.             /* Move color matrix forward */

  204.             color[0][0] = color[0][1]; color[0][1] = color[0][2]; color[0][2] = color[0][3];

  205.             color[1][0] = color[1][1]; color[1][1] = color[1][2]; color[1][2] = color[1][3];

  206.             color[2][0] = color[2][1]; color[2][1] = color[2][2]; color[2][2] = color[2][3];

  207.             color[3][0] = color[3][1]; color[3][1] = color[3][2]; color[3][2] = color[3][3];

  208. 

  209.             if (x < width - 3) {

  210.                 x += 3;

  211.                 switch (bpp) {

  212.                 case 4:

  213.                     READ_COLOR4(color[0][3], src_line[0], x);

  214.                     READ_COLOR4(color[1][3], src_line[1], x);

  215.                     READ_COLOR4(color[2][3], src_line[2], x);

  216.                     READ_COLOR4(color[3][3], src_line[3], x);

  217.                     break;

  218.                 case 3:

  219.                     READ_COLOR3(color[0][3], src_line[0], x);

  220.                     READ_COLOR3(color[1][3], src_line[1], x);

  221.                     READ_COLOR3(color[2][3], src_line[2], x);

  222.                     READ_COLOR3(color[3][3], src_line[3], x);

  223.                     break;

  224.                 default:        /* case 2 */

  225.                     READ_COLOR2(color[0][3], src_line[0], x);

  226.                     READ_COLOR2(color[1][3], src_line[1], x);

  227.                     READ_COLOR2(color[2][3], src_line[2], x);

  228.                     READ_COLOR2(color[3][3], src_line[3], x);

  229.                 }

  230.                 x -= 3;

  231.             }

  232.         }

  233. 

  234.         /* We're done with one line, so we shift the source lines up */

  235.         src_line[0] = src_line[1];

  236.         src_line[1] = src_line[2];

  237.         src_line[2] = src_line[3];

  238. 

  239.         /* Read next line */

  240.         src_line[3] = src_line[2];

  241.         if (y < height - 3)

  242.             src_line[3] += src_linesize;

  243.     } // y loop

  244. 

  245.     return 0;

  246. }

  247. 

  248. static int query_formats(AVFilterContext *ctx)

  249. {

  250.     static const enum AVPixelFormat pix_fmts[] = {

  251.         AV_PIX_FMT_RGBA, AV_PIX_FMT_BGRA, AV_PIX_FMT_ARGB, AV_PIX_FMT_ABGR,

  252.         AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,

  253.         AV_PIX_FMT_RGB565BE, AV_PIX_FMT_BGR565BE, AV_PIX_FMT_RGB555BE, AV_PIX_FMT_BGR555BE,

  254.         AV_PIX_FMT_RGB565LE, AV_PIX_FMT_BGR565LE, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_BGR555LE,

  255.         AV_PIX_FMT_NONE

  256.     };

  257. 

  258.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);

  259.     if (!fmts_list)

  260.         return AVERROR(ENOMEM);

  261.     return ff_set_common_formats(ctx, fmts_list);

  262. }

  263. 

  264. static int config_input(AVFilterLink *inlink)

  265. {

  266.     Super2xSaIContext *s = inlink->dst->priv;

  267. 

  268.     s->hi_pixel_mask   = 0xFEFEFEFE;

  269.     s->lo_pixel_mask   = 0x01010101;

  270.     s->q_hi_pixel_mask = 0xFCFCFCFC;

  271.     s->q_lo_pixel_mask = 0x03030303;

  272.     s->bpp  = 4;

  273. 

  274.     switch (inlink->format) {

  275.     case AV_PIX_FMT_RGB24:

  276.     case AV_PIX_FMT_BGR24:

  277.         s->bpp = 3;

  278.         break;

  279. 

  280.     case AV_PIX_FMT_RGB565BE:

  281.     case AV_PIX_FMT_BGR565BE:

  282.         s->is_be = 1;

  283.     case AV_PIX_FMT_RGB565LE:

  284.     case AV_PIX_FMT_BGR565LE:

  285.         s->hi_pixel_mask   = 0xF7DEF7DE;

  286.         s->lo_pixel_mask   = 0x08210821;

  287.         s->q_hi_pixel_mask = 0xE79CE79C;

  288.         s->q_lo_pixel_mask = 0x18631863;

  289.         s->bpp = 2;

  290.         break;

  291. 

  292.     case AV_PIX_FMT_BGR555BE:

  293.     case AV_PIX_FMT_RGB555BE:

  294.         s->is_be = 1;

  295.     case AV_PIX_FMT_BGR555LE:

  296.     case AV_PIX_FMT_RGB555LE:

  297.         s->hi_pixel_mask   = 0x7BDE7BDE;

  298.         s->lo_pixel_mask   = 0x04210421;

  299.         s->q_hi_pixel_mask = 0x739C739C;

  300.         s->q_lo_pixel_mask = 0x0C630C63;

  301.         s->bpp = 2;

  302.         break;

  303.     }

  304. 

  305.     return 0;

  306. }

  307. 

  308. static int config_output(AVFilterLink *outlink)

  309. {

  310.     AVFilterLink *inlink = outlink->src->inputs[0];

  311. 

  312.     outlink->w = inlink->w*2;

  313.     outlink->h = inlink->h*2;

  314. 

  315.     av_log(inlink->dst, AV_LOG_VERBOSE, "fmt:%s size:%dx%d -> size:%dx%d\n",

  316.            av_get_pix_fmt_name(inlink->format),

  317.            inlink->w, inlink->h, outlink->w, outlink->h);

  318. 

  319.     return 0;

  320. }

  321. 

  322. static int filter_frame(AVFilterLink *inlink, AVFrame *in)

  323. {

  324.     AVFilterContext *ctx = inlink->dst;

  325.     AVFilterLink *outlink = ctx->outputs[0];

  326.     ThreadData td;

  327.     AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);

  328.     if (!out) {

  329.         av_frame_free(&in);

  330.         return AVERROR(ENOMEM);

  331.     }

  332.     av_frame_copy_props(out, in);

  333.     out->width  = outlink->w;

  334.     out->height = outlink->h;

  335. 

  336.     td.in = in, td.out = out;

  337.     ctx->internal->execute(ctx, super2xsai, &td, NULL, FFMIN(in->height, ff_filter_get_nb_threads(ctx)));

  338. 

  339.     av_frame_free(&in);

  340.     return ff_filter_frame(outlink, out);

  341. }

  342. 

  343. static const AVFilterPad super2xsai_inputs[] = {

  344.     {

  345.         .name         = "default",

  346.         .type         = AVMEDIA_TYPE_VIDEO,

  347.         .config_props = config_input,

  348.         .filter_frame = filter_frame,

  349.     },

  350.     { NULL }

  351. };

  352. 

  353. static const AVFilterPad super2xsai_outputs[] = {

  354.     {

  355.         .name         = "default",

  356.         .type         = AVMEDIA_TYPE_VIDEO,

  357.         .config_props = config_output,

  358.     },

  359.     { NULL }

  360. };

  361. 

  362. AVFilter ff_vf_super2xsai = {

  363.     .name          = "super2xsai",

  364.     .description   = NULL_IF_CONFIG_SMALL("Scale the input by 2x using the Super2xSaI pixel art algorithm."),

  365.     .priv_size     = sizeof(Super2xSaIContext),

  366.     .query_formats = query_formats,

  367.     .inputs        = super2xsai_inputs,

  368.     .outputs       = super2xsai_outputs,

  369.     .flags         = AVFILTER_FLAG_SLICE_THREADS,

  370. };