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  1. /*
  2.  * Copyright (c) 2008 Affine Systems, Inc (Michael Sullivan, Bobby Impollonia)
  3.  * Copyright (c) 2013 Andrey Utkin <andrey.krieger.utkin gmail com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Box and grid drawing filters. Also a nice template for a filter
  25.  * that needs to write in the input frame.
  26.  */
  27.  
  28. #include "libavutil/colorspace.h"
  29. #include "libavutil/common.h"
  30. #include "libavutil/opt.h"
  31. #include "libavutil/eval.h"
  32. #include "libavutil/pixdesc.h"
  33. #include "libavutil/parseutils.h"
  34. #include "avfilter.h"
  35. #include "formats.h"
  36. #include "internal.h"
  37. #include "video.h"
  38.  
  39. static const char *const var_names[] = {
  40.     "dar",
  41.     "hsub", "vsub",
  42.     "in_h", "ih",      ///< height of the input video
  43.     "in_w", "iw",      ///< width  of the input video
  44.     "sar",
  45.     "x",
  46.     "y",
  47.     "h",              ///< height of the rendered box
  48.     "w",              ///< width  of the rendered box
  49.     "t",
  50.     "max",
  51.     NULL
  52. };
  53.  
  54. enum { Y, U, V, A };
  55.  
  56. enum var_name {
  57.     VAR_DAR,
  58.     VAR_HSUB, VAR_VSUB,
  59.     VAR_IN_H, VAR_IH,
  60.     VAR_IN_W, VAR_IW,
  61.     VAR_SAR,
  62.     VAR_X,
  63.     VAR_Y,
  64.     VAR_H,
  65.     VAR_W,
  66.     VAR_T,
  67.     VAR_MAX,
  68.     VARS_NB
  69. };
  70.  
  71. typedef struct DrawBoxContext {
  72.     const AVClass *class;
  73.     int x, y, w, h;
  74.     int thickness;
  75.     char *color_str;
  76.     unsigned char yuv_color[4];
  77.     int invert_color; ///< invert luma color
  78.     int vsub, hsub;   ///< chroma subsampling
  79.     char *x_expr, *y_expr; ///< expression for x and y
  80.     char *w_expr, *h_expr; ///< expression for width and height
  81.     char *t_expr;          ///< expression for thickness
  82. } DrawBoxContext;
  83.  
  84. static const int NUM_EXPR_EVALS = 5;
  85.  
  86. static av_cold int init(AVFilterContext *ctx)
  87. {
  88.     DrawBoxContext *s = ctx->priv;
  89.     uint8_t rgba_color[4];
  90.  
  91.     if (!strcmp(s->color_str, "invert"))
  92.         s->invert_color = 1;
  93.     else if (av_parse_color(rgba_color, s->color_str, -1, ctx) < 0)
  94.         return AVERROR(EINVAL);
  95.  
  96.     if (!s->invert_color) {
  97.         s->yuv_color[Y] = RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
  98.         s->yuv_color[U] = RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
  99.         s->yuv_color[V] = RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
  100.         s->yuv_color[A] = rgba_color[3];
  101.     }
  102.  
  103.     return 0;
  104. }
  105.  
  106. static int query_formats(AVFilterContext *ctx)
  107. {
  108.     static const enum AVPixelFormat pix_fmts[] = {
  109.         AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
  110.         AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,
  111.         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
  112.         AV_PIX_FMT_YUV440P,  AV_PIX_FMT_YUVJ440P,
  113.         AV_PIX_FMT_NONE
  114.     };
  115.     AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
  116.     if (!fmts_list)
  117.         return AVERROR(ENOMEM);
  118.     return ff_set_common_formats(ctx, fmts_list);
  119. }
  120.  
  121. static int config_input(AVFilterLink *inlink)
  122. {
  123.     AVFilterContext *ctx = inlink->dst;
  124.     DrawBoxContext *s = ctx->priv;
  125.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
  126.     double var_values[VARS_NB], res;
  127.     char *expr;
  128.     int ret;
  129.     int i;
  130.  
  131.     s->hsub = desc->log2_chroma_w;
  132.     s->vsub = desc->log2_chroma_h;
  133.  
  134.     var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
  135.     var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
  136.     var_values[VAR_SAR]  = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
  137.     var_values[VAR_DAR]  = (double)inlink->w / inlink->h * var_values[VAR_SAR];
  138.     var_values[VAR_HSUB] = s->hsub;
  139.     var_values[VAR_VSUB] = s->vsub;
  140.     var_values[VAR_X] = NAN;
  141.     var_values[VAR_Y] = NAN;
  142.     var_values[VAR_H] = NAN;
  143.     var_values[VAR_W] = NAN;
  144.     var_values[VAR_T] = NAN;
  145.  
  146.     for (i = 0; i <= NUM_EXPR_EVALS; i++) {
  147.         /* evaluate expressions, fail on last iteration */
  148.         var_values[VAR_MAX] = inlink->w;
  149.         if ((ret = av_expr_parse_and_eval(&res, (expr = s->x_expr),
  150.                                           var_names, var_values,
  151.                                           NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
  152.             goto fail;
  153.         s->x = var_values[VAR_X] = res;
  154.  
  155.         var_values[VAR_MAX] = inlink->h;
  156.         if ((ret = av_expr_parse_and_eval(&res, (expr = s->y_expr),
  157.                                           var_names, var_values,
  158.                                           NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
  159.             goto fail;
  160.         s->y = var_values[VAR_Y] = res;
  161.  
  162.         var_values[VAR_MAX] = inlink->w - s->x;
  163.         if ((ret = av_expr_parse_and_eval(&res, (expr = s->w_expr),
  164.                                           var_names, var_values,
  165.                                           NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
  166.             goto fail;
  167.         s->w = var_values[VAR_W] = res;
  168.  
  169.         var_values[VAR_MAX] = inlink->h - s->y;
  170.         if ((ret = av_expr_parse_and_eval(&res, (expr = s->h_expr),
  171.                                           var_names, var_values,
  172.                                           NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
  173.             goto fail;
  174.         s->h = var_values[VAR_H] = res;
  175.  
  176.         var_values[VAR_MAX] = INT_MAX;
  177.         if ((ret = av_expr_parse_and_eval(&res, (expr = s->t_expr),
  178.                                           var_names, var_values,
  179.                                           NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0 && i == NUM_EXPR_EVALS)
  180.             goto fail;
  181.         s->thickness = var_values[VAR_T] = res;
  182.     }
  183.  
  184.     /* if w or h are zero, use the input w/h */
  185.     s->w = (s->w > 0) ? s->w : inlink->w;
  186.     s->h = (s->h > 0) ? s->h : inlink->h;
  187.  
  188.     /* sanity check width and height */
  189.     if (s->w <  0 || s->h <  0) {
  190.         av_log(ctx, AV_LOG_ERROR, "Size values less than 0 are not acceptable.\n");
  191.         return AVERROR(EINVAL);
  192.     }
  193.  
  194.     av_log(ctx, AV_LOG_VERBOSE, "x:%d y:%d w:%d h:%d color:0x%02X%02X%02X%02X\n",
  195.            s->x, s->y, s->w, s->h,
  196.            s->yuv_color[Y], s->yuv_color[U], s->yuv_color[V], s->yuv_color[A]);
  197.  
  198.     return 0;
  199.  
  200. fail:
  201.     av_log(ctx, AV_LOG_ERROR,
  202.            "Error when evaluating the expression '%s'.\n",
  203.            expr);
  204.     return ret;
  205. }
  206.  
  207. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
  208. {
  209.     DrawBoxContext *s = inlink->dst->priv;
  210.     int plane, x, y, xb = s->x, yb = s->y;
  211.     unsigned char *row[4];
  212.  
  213.     for (y = FFMAX(yb, 0); y < frame->height && y < (yb + s->h); y++) {
  214.         row[0] = frame->data[0] + y * frame->linesize[0];
  215.  
  216.         for (plane = 1; plane < 3; plane++)
  217.             row[plane] = frame->data[plane] +
  218.                  frame->linesize[plane] * (y >> s->vsub);
  219.  
  220.         if (s->invert_color) {
  221.             for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++)
  222.                 if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
  223.                     (x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness))
  224.                     row[0][x] = 0xff - row[0][x];
  225.         } else {
  226.             for (x = FFMAX(xb, 0); x < xb + s->w && x < frame->width; x++) {
  227.                 double alpha = (double)s->yuv_color[A] / 255;
  228.  
  229.                 if ((y - yb < s->thickness) || (yb + s->h - 1 - y < s->thickness) ||
  230.                     (x - xb < s->thickness) || (xb + s->w - 1 - x < s->thickness)) {
  231.                     row[0][x                 ] = (1 - alpha) * row[0][x                 ] + alpha * s->yuv_color[Y];
  232.                     row[1][x >> s->hsub] = (1 - alpha) * row[1][x >> s->hsub] + alpha * s->yuv_color[U];
  233.                     row[2][x >> s->hsub] = (1 - alpha) * row[2][x >> s->hsub] + alpha * s->yuv_color[V];
  234.                 }
  235.             }
  236.         }
  237.     }
  238.  
  239.     return ff_filter_frame(inlink->dst->outputs[0], frame);
  240. }
  241.  
  242. #define OFFSET(x) offsetof(DrawBoxContext, x)
  243. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
  244.  
  245. #if CONFIG_DRAWBOX_FILTER
  246.  
  247. static const AVOption drawbox_options[] = {
  248.     { "x",         "set horizontal position of the left box edge", OFFSET(x_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  249.     { "y",         "set vertical position of the top box edge",    OFFSET(y_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  250.     { "width",     "set width of the box",                         OFFSET(w_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  251.     { "w",         "set width of the box",                         OFFSET(w_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  252.     { "height",    "set height of the box",                        OFFSET(h_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  253.     { "h",         "set height of the box",                        OFFSET(h_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  254.     { "color",     "set color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
  255.     { "c",         "set color of the box",                         OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
  256.     { "thickness", "set the box thickness",                        OFFSET(t_expr),    AV_OPT_TYPE_STRING, { .str="3" },       CHAR_MIN, CHAR_MAX, FLAGS },
  257.     { "t",         "set the box thickness",                        OFFSET(t_expr),    AV_OPT_TYPE_STRING, { .str="3" },       CHAR_MIN, CHAR_MAX, FLAGS },
  258.     { NULL }
  259. };
  260.  
  261. AVFILTER_DEFINE_CLASS(drawbox);
  262.  
  263. static const AVFilterPad drawbox_inputs[] = {
  264.     {
  265.         .name           = "default",
  266.         .type           = AVMEDIA_TYPE_VIDEO,
  267.         .config_props   = config_input,
  268.         .filter_frame   = filter_frame,
  269.         .needs_writable = 1,
  270.     },
  271.     { NULL }
  272. };
  273.  
  274. static const AVFilterPad drawbox_outputs[] = {
  275.     {
  276.         .name = "default",
  277.         .type = AVMEDIA_TYPE_VIDEO,
  278.     },
  279.     { NULL }
  280. };
  281.  
  282. AVFilter ff_vf_drawbox = {
  283.     .name          = "drawbox",
  284.     .description   = NULL_IF_CONFIG_SMALL("Draw a colored box on the input video."),
  285.     .priv_size     = sizeof(DrawBoxContext),
  286.     .priv_class    = &drawbox_class,
  287.     .init          = init,
  288.     .query_formats = query_formats,
  289.     .inputs        = drawbox_inputs,
  290.     .outputs       = drawbox_outputs,
  291.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
  292. };
  293. #endif /* CONFIG_DRAWBOX_FILTER */
  294.  
  295. #if CONFIG_DRAWGRID_FILTER
  296. static av_pure av_always_inline int pixel_belongs_to_grid(DrawBoxContext *drawgrid, int x, int y)
  297. {
  298.     // x is horizontal (width) coord,
  299.     // y is vertical (height) coord
  300.     int x_modulo;
  301.     int y_modulo;
  302.  
  303.     // Abstract from the offset
  304.     x -= drawgrid->x;
  305.     y -= drawgrid->y;
  306.  
  307.     x_modulo = x % drawgrid->w;
  308.     y_modulo = y % drawgrid->h;
  309.  
  310.     // If x or y got negative, fix values to preserve logics
  311.     if (x_modulo < 0)
  312.         x_modulo += drawgrid->w;
  313.     if (y_modulo < 0)
  314.         y_modulo += drawgrid->h;
  315.  
  316.     return x_modulo < drawgrid->thickness  // Belongs to vertical line
  317.         || y_modulo < drawgrid->thickness;  // Belongs to horizontal line
  318. }
  319.  
  320. static int drawgrid_filter_frame(AVFilterLink *inlink, AVFrame *frame)
  321. {
  322.     DrawBoxContext *drawgrid = inlink->dst->priv;
  323.     int plane, x, y;
  324.     uint8_t *row[4];
  325.  
  326.     for (y = 0; y < frame->height; y++) {
  327.         row[0] = frame->data[0] + y * frame->linesize[0];
  328.  
  329.         for (plane = 1; plane < 3; plane++)
  330.             row[plane] = frame->data[plane] +
  331.                  frame->linesize[plane] * (y >> drawgrid->vsub);
  332.  
  333.         if (drawgrid->invert_color) {
  334.             for (x = 0; x < frame->width; x++)
  335.                 if (pixel_belongs_to_grid(drawgrid, x, y))
  336.                     row[0][x] = 0xff - row[0][x];
  337.         } else {
  338.             for (x = 0; x < frame->width; x++) {
  339.                 double alpha = (double)drawgrid->yuv_color[A] / 255;
  340.  
  341.                 if (pixel_belongs_to_grid(drawgrid, x, y)) {
  342.                     row[0][x                  ] = (1 - alpha) * row[0][x                  ] + alpha * drawgrid->yuv_color[Y];
  343.                     row[1][x >> drawgrid->hsub] = (1 - alpha) * row[1][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[U];
  344.                     row[2][x >> drawgrid->hsub] = (1 - alpha) * row[2][x >> drawgrid->hsub] + alpha * drawgrid->yuv_color[V];
  345.                 }
  346.             }
  347.         }
  348.     }
  349.  
  350.     return ff_filter_frame(inlink->dst->outputs[0], frame);
  351. }
  352.  
  353. static const AVOption drawgrid_options[] = {
  354.     { "x",         "set horizontal offset",   OFFSET(x_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  355.     { "y",         "set vertical offset",     OFFSET(y_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  356.     { "width",     "set width of grid cell",  OFFSET(w_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  357.     { "w",         "set width of grid cell",  OFFSET(w_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  358.     { "height",    "set height of grid cell", OFFSET(h_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  359.     { "h",         "set height of grid cell", OFFSET(h_expr),    AV_OPT_TYPE_STRING, { .str="0" },       CHAR_MIN, CHAR_MAX, FLAGS },
  360.     { "color",     "set color of the grid",   OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
  361.     { "c",         "set color of the grid",   OFFSET(color_str), AV_OPT_TYPE_STRING, { .str = "black" }, CHAR_MIN, CHAR_MAX, FLAGS },
  362.     { "thickness", "set grid line thickness", OFFSET(t_expr),    AV_OPT_TYPE_STRING, {.str="1"},         CHAR_MIN, CHAR_MAX, FLAGS },
  363.     { "t",         "set grid line thickness", OFFSET(t_expr),    AV_OPT_TYPE_STRING, {.str="1"},         CHAR_MIN, CHAR_MAX, FLAGS },
  364.     { NULL }
  365. };
  366.  
  367. AVFILTER_DEFINE_CLASS(drawgrid);
  368.  
  369. static const AVFilterPad drawgrid_inputs[] = {
  370.     {
  371.         .name           = "default",
  372.         .type           = AVMEDIA_TYPE_VIDEO,
  373.         .config_props   = config_input,
  374.         .filter_frame   = drawgrid_filter_frame,
  375.         .needs_writable = 1,
  376.     },
  377.     { NULL }
  378. };
  379.  
  380. static const AVFilterPad drawgrid_outputs[] = {
  381.     {
  382.         .name = "default",
  383.         .type = AVMEDIA_TYPE_VIDEO,
  384.     },
  385.     { NULL }
  386. };
  387.  
  388. AVFilter ff_vf_drawgrid = {
  389.     .name          = "drawgrid",
  390.     .description   = NULL_IF_CONFIG_SMALL("Draw a colored grid on the input video."),
  391.     .priv_size     = sizeof(DrawBoxContext),
  392.     .priv_class    = &drawgrid_class,
  393.     .init          = init,
  394.     .query_formats = query_formats,
  395.     .inputs        = drawgrid_inputs,
  396.     .outputs       = drawgrid_outputs,
  397.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
  398. };
  399.  
  400. #endif  /* CONFIG_DRAWGRID_FILTER */
  401.