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FFmpeg/libavfilter/vf_drawtext.c

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  1. /*

  2.  * Copyright (c) 2011 Stefano Sabatini

  3.  * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram

  4.  * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (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 GNU

  16.  * Lesser General Public License for more details.

  17.  *

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

  19.  * License along with FFmpeg; if not, write to the Free Software

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

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * drawtext filter, based on the original vhook/drawtext.c

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include <sys/time.h>

  30. #include <time.h>

  31. 

  32. #include "config.h"

  33. #include "libavutil/avstring.h"

  34. #include "libavutil/colorspace.h"

  35. #include "libavutil/file.h"

  36. #include "libavutil/eval.h"

  37. #include "libavutil/opt.h"

  38. #include "libavutil/random_seed.h"

  39. #include "libavutil/parseutils.h"

  40. #include "libavutil/pixdesc.h"

  41. #include "libavutil/timecode.h"

  42. #include "libavutil/tree.h"

  43. #include "libavutil/lfg.h"

  44. #include "avfilter.h"

  45. #include "drawutils.h"

  46. 

  47. #undef time

  48. 

  49. #include <ft2build.h>

  50. #include <freetype/config/ftheader.h>

  51. #include FT_FREETYPE_H

  52. #include FT_GLYPH_H

  53. 

  54. static const char *const var_names[] = {

  55.     "main_w", "w", "W",       ///< width  of the input video

  56.     "main_h", "h", "H",       ///< height of the input video

  57.     "tw", "text_w",           ///< width  of the rendered text

  58.     "th", "text_h",           ///< height of the rendered text

  59.     "max_glyph_w",            ///< max glyph width

  60.     "max_glyph_h",            ///< max glyph height

  61.     "max_glyph_a", "ascent",  ///< max glyph ascent

  62.     "max_glyph_d", "descent", ///< min glyph descent

  63.     "line_h", "lh",           ///< line height, same as max_glyph_h

  64.     "sar",

  65.     "dar",

  66.     "hsub",

  67.     "vsub",

  68.     "x",

  69.     "y",

  70.     "n",                      ///< number of frame

  71.     "t",                      ///< timestamp expressed in seconds

  72.     NULL

  73. };

  74. 

  75. static const char *const fun2_names[] = {

  76.     "rand"

  77. };

  78. 

  79. static double drand(void *opaque, double min, double max)

  80. {

  81.     return min + (max-min) / UINT_MAX * av_lfg_get(opaque);

  82. }

  83. 

  84. typedef double (*eval_func2)(void *, double a, double b);

  85. 

  86. static const eval_func2 fun2[] = {

  87.     drand,

  88.     NULL

  89. };

  90. 

  91. enum var_name {

  92.     VAR_MAIN_W, VAR_w, VAR_W,

  93.     VAR_MAIN_H, VAR_h, VAR_H,

  94.     VAR_TW, VAR_TEXT_W,

  95.     VAR_TH, VAR_TEXT_H,

  96.     VAR_MAX_GLYPH_W,

  97.     VAR_MAX_GLYPH_H,

  98.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  99.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  100.     VAR_LINE_H, VAR_LH,

  101.     VAR_SAR,

  102.     VAR_DAR,

  103.     VAR_HSUB,

  104.     VAR_VSUB,

  105.     VAR_X,

  106.     VAR_Y,

  107.     VAR_N,

  108.     VAR_T,

  109.     VAR_VARS_NB

  110. };

  111. 

  112. typedef struct {

  113.     const AVClass *class;

  114.     int reinit;                     ///< tells if the filter is being reinited

  115.     uint8_t *fontfile;              ///< font to be used

  116.     uint8_t *text;                  ///< text to be drawn

  117.     uint8_t *expanded_text;         ///< used to contain the strftime()-expanded text

  118.     size_t   expanded_text_size;    ///< size in bytes of the expanded_text buffer

  119.     int ft_load_flags;              ///< flags used for loading fonts, see FT_LOAD_*

  120.     FT_Vector *positions;           ///< positions for each element in the text

  121.     size_t nb_positions;            ///< number of elements of positions array

  122.     char *textfile;                 ///< file with text to be drawn

  123.     int x;                          ///< x position to start drawing text

  124.     int y;                          ///< y position to start drawing text

  125.     int max_glyph_w;                ///< max glyph width

  126.     int max_glyph_h;                ///< max glyph height

  127.     int shadowx, shadowy;

  128.     unsigned int fontsize;          ///< font size to use

  129.     char *fontcolor_string;         ///< font color as string

  130.     char *boxcolor_string;          ///< box color as string

  131.     char *shadowcolor_string;       ///< shadow color as string

  132.     uint8_t fontcolor[4];           ///< foreground color

  133.     uint8_t boxcolor[4];            ///< background color

  134.     uint8_t shadowcolor[4];         ///< shadow color

  135.     uint8_t fontcolor_rgba[4];      ///< foreground color in RGBA

  136.     uint8_t boxcolor_rgba[4];       ///< background color in RGBA

  137.     uint8_t shadowcolor_rgba[4];    ///< shadow color in RGBA

  138. 

  139.     short int draw_box;             ///< draw box around text - true or false

  140.     int use_kerning;                ///< font kerning is used - true/false

  141.     int tabsize;                    ///< tab size

  142.     int fix_bounds;                 ///< do we let it go out of frame bounds - t/f

  143. 

  144.     FT_Library library;             ///< freetype font library handle

  145.     FT_Face face;                   ///< freetype font face handle

  146.     struct AVTreeNode *glyphs;      ///< rendered glyphs, stored using the UTF-32 char code

  147.     int hsub, vsub;                 ///< chroma subsampling values

  148.     int is_packed_rgb;

  149.     int pixel_step[4];              ///< distance in bytes between the component of each pixel

  150.     uint8_t rgba_map[4];            ///< map RGBA offsets to the positions in the packed RGBA format

  151.     uint8_t *box_line[4];           ///< line used for filling the box background

  152.     char *x_expr;                   ///< expression for x position

  153.     char *y_expr;                   ///< expression for y position

  154.     AVExpr *x_pexpr, *y_pexpr;      ///< parsed expressions for x and y

  155.     int64_t basetime;               ///< base pts time in the real world for display

  156.     double var_values[VAR_VARS_NB];

  157.     char   *d_expr;

  158.     AVExpr *d_pexpr;

  159.     int draw;                       ///< set to zero to prevent drawing

  160.     AVLFG  prng;                    ///< random

  161.     char       *tc_opt_string;      ///< specified timecode option string

  162.     AVRational  tc_rate;            ///< frame rate for timecode

  163.     AVTimecode  tc;                 ///< timecode context

  164.     int tc24hmax;                   ///< 1 if timecode is wrapped to 24 hours, 0 otherwise

  165.     int frame_id;

  166. } DrawTextContext;

  167. 

  168. #define OFFSET(x) offsetof(DrawTextContext, x)

  169. 

  170. static const AVOption drawtext_options[]= {

  171. {"fontfile", "set font file",        OFFSET(fontfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  172. {"text",     "set text",             OFFSET(text),               AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  173. {"textfile", "set text file",        OFFSET(textfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  174. {"fontcolor",   "set foreground color", OFFSET(fontcolor_string),   AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  175. {"boxcolor",    "set box color",        OFFSET(boxcolor_string),    AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },

  176. {"shadowcolor", "set shadow color",     OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  177. {"box",      "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.dbl=0},     0,        1        },

  178. {"fontsize", "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.dbl=16},    1,        INT_MAX  },

  179. {"x",        "set x expression",     OFFSET(x_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX },

  180. {"y",        "set y expression",     OFFSET(y_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX },

  181. {"shadowx",  "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  182. {"shadowy",  "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  183. {"tabsize",  "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.dbl=4},     0,        INT_MAX  },

  184. {"basetime", "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.dbl=AV_NOPTS_VALUE},     INT64_MIN,        INT64_MAX  },

  185. {"draw",     "if false do not draw", OFFSET(d_expr),             AV_OPT_TYPE_STRING, {.str="1"},   CHAR_MIN, CHAR_MAX },

  186. {"timecode", "set initial timecode", OFFSET(tc_opt_string),      AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  187. {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT,  {.dbl=0},            0,        1 },

  188. {"r",        "set rate (timecode only)", OFFSET(tc_rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },

  189. {"rate",     "set rate (timecode only)", OFFSET(tc_rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },

  190. {"fix_bounds", "if true, check and fix text coords to avoid clipping",

  191.                                      OFFSET(fix_bounds),         AV_OPT_TYPE_INT,    {.dbl=1},     0,        1        },

  192. 

  193. /* FT_LOAD_* flags */

  194. {"ft_load_flags", "set font loading flags for libfreetype",   OFFSET(ft_load_flags),  AV_OPT_TYPE_FLAGS,  {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },

  195. {"default",                     "set default",                     0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  196. {"no_scale",                    "set no_scale",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  197. {"no_hinting",                  "set no_hinting",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  198. {"render",                      "set render",                      0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  199. {"no_bitmap",                   "set no_bitmap",                   0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  200. {"vertical_layout",             "set vertical_layout",             0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  201. {"force_autohint",              "set force_autohint",              0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  202. {"crop_bitmap",                 "set crop_bitmap",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  203. {"pedantic",                    "set pedantic",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  204. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  205. {"no_recurse",                  "set no_recurse",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  206. {"ignore_transform",            "set ignore_transform",            0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  207. {"monochrome",                  "set monochrome",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  208. {"linear_design",               "set linear_design",               0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  209. {"no_autohint",                 "set no_autohint",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  210. {NULL},

  211. };

  212. 

  213. static const char *drawtext_get_name(void *ctx)

  214. {

  215.     return "drawtext";

  216. }

  217. 

  218. static const AVClass drawtext_class = {

  219.     "DrawTextContext",

  220.     drawtext_get_name,

  221.     drawtext_options

  222. };

  223. 

  224. #undef __FTERRORS_H__

  225. #define FT_ERROR_START_LIST {

  226. #define FT_ERRORDEF(e, v, s) { (e), (s) },

  227. #define FT_ERROR_END_LIST { 0, NULL } };

  228. 

  229. struct ft_error

  230. {

  231.     int err;

  232.     const char *err_msg;

  233. } static ft_errors[] =

  234. #include FT_ERRORS_H

  235. 

  236. #define FT_ERRMSG(e) ft_errors[e].err_msg

  237. 

  238. typedef struct {

  239.     FT_Glyph *glyph;

  240.     uint32_t code;

  241.     FT_Bitmap bitmap; ///< array holding bitmaps of font

  242.     FT_BBox bbox;

  243.     int advance;

  244.     int bitmap_left;

  245.     int bitmap_top;

  246. } Glyph;

  247. 

  248. static int glyph_cmp(void *key, const void *b)

  249. {

  250.     const Glyph *a = key, *bb = b;

  251.     int64_t diff = (int64_t)a->code - (int64_t)bb->code;

  252.     return diff > 0 ? 1 : diff < 0 ? -1 : 0;

  253. }

  254. 

  255. /**

  256.  * Load glyphs corresponding to the UTF-32 codepoint code.

  257.  */

  258. static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)

  259. {

  260.     DrawTextContext *dtext = ctx->priv;

  261.     Glyph *glyph;

  262.     struct AVTreeNode *node = NULL;

  263.     int ret;

  264. 

  265.     /* load glyph into dtext->face->glyph */

  266.     if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))

  267.         return AVERROR(EINVAL);

  268. 

  269.     /* save glyph */

  270.     if (!(glyph = av_mallocz(sizeof(*glyph))) ||

  271.         !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {

  272.         ret = AVERROR(ENOMEM);

  273.         goto error;

  274.     }

  275.     glyph->code  = code;

  276. 

  277.     if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {

  278.         ret = AVERROR(EINVAL);

  279.         goto error;

  280.     }

  281. 

  282.     glyph->bitmap      = dtext->face->glyph->bitmap;

  283.     glyph->bitmap_left = dtext->face->glyph->bitmap_left;

  284.     glyph->bitmap_top  = dtext->face->glyph->bitmap_top;

  285.     glyph->advance     = dtext->face->glyph->advance.x >> 6;

  286. 

  287.     /* measure text height to calculate text_height (or the maximum text height) */

  288.     FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);

  289. 

  290.     /* cache the newly created glyph */

  291.     if (!(node = av_mallocz(av_tree_node_size))) {

  292.         ret = AVERROR(ENOMEM);

  293.         goto error;

  294.     }

  295.     av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);

  296. 

  297.     if (glyph_ptr)

  298.         *glyph_ptr = glyph;

  299.     return 0;

  300. 

  301. error:

  302.     if (glyph)

  303.         av_freep(&glyph->glyph);

  304.     av_freep(&glyph);

  305.     av_freep(&node);

  306.     return ret;

  307. }

  308. 

  309. static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)

  310. {

  311.     int err;

  312.     DrawTextContext *dtext = ctx->priv;

  313.     Glyph *glyph;

  314. 

  315.     dtext->class = &drawtext_class;

  316.     av_opt_set_defaults(dtext);

  317. 

  318.     if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {

  319.         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);

  320.         return err;

  321.     }

  322. 

  323.     if (!dtext->fontfile) {

  324.         av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");

  325.         return AVERROR(EINVAL);

  326.     }

  327. 

  328.     if (dtext->textfile) {

  329.         uint8_t *textbuf;

  330.         size_t textbuf_size;

  331. 

  332.         if (dtext->text) {

  333.             av_log(ctx, AV_LOG_ERROR,

  334.                    "Both text and text file provided. Please provide only one\n");

  335.             return AVERROR(EINVAL);

  336.         }

  337.         if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {

  338.             av_log(ctx, AV_LOG_ERROR,

  339.                    "The text file '%s' could not be read or is empty\n",

  340.                    dtext->textfile);

  341.             return err;

  342.         }

  343. 

  344.         if (!(dtext->text = av_malloc(textbuf_size+1)))

  345.             return AVERROR(ENOMEM);

  346.         memcpy(dtext->text, textbuf, textbuf_size);

  347.         dtext->text[textbuf_size] = 0;

  348.         av_file_unmap(textbuf, textbuf_size);

  349.     }

  350. 

  351.     if (dtext->tc_opt_string) {

  352.         int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,

  353.                                                dtext->tc_opt_string, ctx);

  354.         if (ret < 0)

  355.             return ret;

  356.         if (dtext->tc24hmax)

  357.             dtext->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;

  358.         if (!dtext->text)

  359.             dtext->text = av_strdup("");

  360.     }

  361. 

  362.     if (!dtext->text) {

  363.         av_log(ctx, AV_LOG_ERROR,

  364.                "Either text, a valid file or a timecode must be provided\n");

  365.         return AVERROR(EINVAL);

  366.     }

  367. 

  368.     if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {

  369.         av_log(ctx, AV_LOG_ERROR,

  370.                "Invalid font color '%s'\n", dtext->fontcolor_string);

  371.         return err;

  372.     }

  373. 

  374.     if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {

  375.         av_log(ctx, AV_LOG_ERROR,

  376.                "Invalid box color '%s'\n", dtext->boxcolor_string);

  377.         return err;

  378.     }

  379. 

  380.     if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {

  381.         av_log(ctx, AV_LOG_ERROR,

  382.                "Invalid shadow color '%s'\n", dtext->shadowcolor_string);

  383.         return err;

  384.     }

  385. 

  386.     if ((err = FT_Init_FreeType(&(dtext->library)))) {

  387.         av_log(ctx, AV_LOG_ERROR,

  388.                "Could not load FreeType: %s\n", FT_ERRMSG(err));

  389.         return AVERROR(EINVAL);

  390.     }

  391. 

  392.     /* load the face, and set up the encoding, which is by default UTF-8 */

  393.     if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {

  394.         av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",

  395.                dtext->fontfile, FT_ERRMSG(err));

  396.         return AVERROR(EINVAL);

  397.     }

  398.     if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {

  399.         av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",

  400.                dtext->fontsize, FT_ERRMSG(err));

  401.         return AVERROR(EINVAL);

  402.     }

  403. 

  404.     dtext->use_kerning = FT_HAS_KERNING(dtext->face);

  405. 

  406.     /* load the fallback glyph with code 0 */

  407.     load_glyph(ctx, NULL, 0);

  408. 

  409.     /* set the tabsize in pixels */

  410.     if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {

  411.         av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");

  412.         return err;

  413.     }

  414.     dtext->tabsize *= glyph->advance;

  415. 

  416.     return 0;

  417. }

  418. 

  419. static int query_formats(AVFilterContext *ctx)

  420. {

  421.     static const enum PixelFormat pix_fmts[] = {

  422.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  423.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  424.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  425.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  426.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  427.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  428.         PIX_FMT_NONE

  429.     };

  430. 

  431.     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

  432.     return 0;

  433. }

  434. 

  435. static int glyph_enu_free(void *opaque, void *elem)

  436. {

  437.     av_free(elem);

  438.     return 0;

  439. }

  440. 

  441. static av_cold void uninit(AVFilterContext *ctx)

  442. {

  443.     DrawTextContext *dtext = ctx->priv;

  444.     int i;

  445. 

  446.     av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;

  447.     av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;

  448. 

  449.     av_freep(&dtext->boxcolor_string);

  450.     av_freep(&dtext->expanded_text);

  451.     av_freep(&dtext->fontcolor_string);

  452.     av_freep(&dtext->fontfile);

  453.     av_freep(&dtext->shadowcolor_string);

  454.     av_freep(&dtext->text);

  455.     av_freep(&dtext->x_expr);

  456.     av_freep(&dtext->y_expr);

  457. 

  458.     av_freep(&dtext->positions);

  459.     dtext->nb_positions = 0;

  460. 

  461.     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);

  462.     av_tree_destroy(dtext->glyphs);

  463.     dtext->glyphs = NULL;

  464. 

  465.     FT_Done_Face(dtext->face);

  466.     FT_Done_FreeType(dtext->library);

  467. 

  468.     for (i = 0; i < 4; i++) {

  469.         av_freep(&dtext->box_line[i]);

  470.         dtext->pixel_step[i] = 0;

  471.     }

  472. }

  473. 

  474. static inline int is_newline(uint32_t c)

  475. {

  476.     return c == '\n' || c == '\r' || c == '\f' || c == '\v';

  477. }

  478. 

  479. static int config_input(AVFilterLink *inlink)

  480. {

  481.     AVFilterContext *ctx = inlink->dst;

  482.     DrawTextContext *dtext = ctx->priv;

  483.     const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];

  484.     int ret;

  485. 

  486.     dtext->hsub = pix_desc->log2_chroma_w;

  487.     dtext->vsub = pix_desc->log2_chroma_h;

  488. 

  489.     if ((ret =

  490.          ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,

  491.                                  inlink->w, dtext->boxcolor,

  492.                                  inlink->format, dtext->boxcolor_rgba,

  493.                                  &dtext->is_packed_rgb, dtext->rgba_map)) < 0)

  494.         return ret;

  495. 

  496.     if (!dtext->is_packed_rgb) {

  497.         uint8_t *rgba = dtext->fontcolor_rgba;

  498.         dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  499.         dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  500.         dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

  501.         dtext->fontcolor[3] = rgba[3];

  502.         rgba = dtext->shadowcolor_rgba;

  503.         dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  504.         dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  505.         dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

  506.         dtext->shadowcolor[3] = rgba[3];

  507.     }

  508. 

  509.     dtext->var_values[VAR_w]     = dtext->var_values[VAR_W]     = dtext->var_values[VAR_MAIN_W] = inlink->w;

  510.     dtext->var_values[VAR_h]     = dtext->var_values[VAR_H]     = dtext->var_values[VAR_MAIN_H] = inlink->h;

  511.     dtext->var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;

  512.     dtext->var_values[VAR_DAR]   = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];

  513.     dtext->var_values[VAR_HSUB]  = 1<<pix_desc->log2_chroma_w;

  514.     dtext->var_values[VAR_VSUB]  = 1<<pix_desc->log2_chroma_h;

  515.     dtext->var_values[VAR_X]     = NAN;

  516.     dtext->var_values[VAR_Y]     = NAN;

  517.     if (!dtext->reinit)

  518.         dtext->var_values[VAR_N] = 0;

  519.     dtext->var_values[VAR_T]     = NAN;

  520. 

  521.     av_lfg_init(&dtext->prng, av_get_random_seed());

  522. 

  523.     if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,

  524.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||

  525.         (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,

  526.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||

  527.         (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,

  528.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)

  529. 

  530.         return AVERROR(EINVAL);

  531. 

  532.     return 0;

  533. }

  534. 

  535. static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)

  536. {

  537.     DrawTextContext *dtext = ctx->priv;

  538. 

  539.     if (!strcmp(cmd, "reinit")) {

  540.         int ret;

  541.         uninit(ctx);

  542.         dtext->reinit = 1;

  543.         if ((ret = init(ctx, arg, NULL)) < 0)

  544.             return ret;

  545.         return config_input(ctx->inputs[0]);

  546.     }

  547. 

  548.     return AVERROR(ENOSYS);

  549. }

  550. 

  551. #define GET_BITMAP_VAL(r, c)                                            \

  552.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

  553.         (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \

  554.          bitmap->buffer[(r) * bitmap->pitch +  (c)]

  555. 

  556. #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \

  557.     luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \

  558.     alpha = yuva_color[3] * (val) * 129;                               \

  559.     picref->data[0][luma_pos]    = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos]   ) >> 23; \

  560.     if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\

  561.         chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \

  562.         chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \

  563.         picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \

  564.         picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \

  565.     }\

  566. }

  567. 

  568. static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,

  569.                                  int x, int y, int width, int height,

  570.                                  const uint8_t yuva_color[4], int hsub, int vsub)

  571. {

  572.     int r, c, alpha;

  573.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  574.     uint8_t src_val;

  575. 

  576.     for (r = 0; r < bitmap->rows && r+y < height; r++) {

  577.         for (c = 0; c < bitmap->width && c+x < width; c++) {

  578.             if (c+x < 0 || r+y < 0)

  579.                 continue;

  580. 

  581.             /* get intensity value in the glyph bitmap (source) */

  582.             src_val = GET_BITMAP_VAL(r, c);

  583.             if (!src_val)

  584.                 continue;

  585. 

  586.             SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);

  587.         }

  588.     }

  589. 

  590.     return 0;

  591. }

  592. 

  593. #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \

  594.     p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \

  595.     alpha = rgba_color[3] * (val) * 129;                              \

  596.     *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \

  597.     *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \

  598.     *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \

  599. }

  600. 

  601. static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,

  602.                                  int x, int y, int width, int height, int pixel_step,

  603.                                  const uint8_t rgba_color[4], const uint8_t rgba_map[4])

  604. {

  605.     int r, c, alpha;

  606.     uint8_t *p;

  607.     uint8_t src_val;

  608. 

  609.     for (r = 0; r < bitmap->rows && r+y < height; r++) {

  610.         for (c = 0; c < bitmap->width && c+x < width; c++) {

  611.             if (c+x < 0 || r+y < 0)

  612.                 continue;

  613.             /* get intensity value in the glyph bitmap (source) */

  614.             src_val = GET_BITMAP_VAL(r, c);

  615.             if (!src_val)

  616.                 continue;

  617. 

  618.             SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,

  619.                           rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);

  620.         }

  621.     }

  622. 

  623.     return 0;

  624. }

  625. 

  626. static inline void drawbox(AVFilterBufferRef *picref, int x, int y,

  627.                            int width, int height,

  628.                            uint8_t *line[4], int pixel_step[4], uint8_t color[4],

  629.                            int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])

  630. {

  631.     int i, j, alpha;

  632. 

  633.     if (color[3] != 0xFF) {

  634.         if (is_rgba_packed) {

  635.             uint8_t *p;

  636.             for (j = 0; j < height; j++)

  637.                 for (i = 0; i < width; i++)

  638.                     SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],

  639.                                   rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);

  640.         } else {

  641.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

  642.             for (j = 0; j < height; j++)

  643.                 for (i = 0; i < width; i++)

  644.                     SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);

  645.         }

  646.     } else {

  647.         ff_draw_rectangle(picref->data, picref->linesize,

  648.                           line, pixel_step, hsub, vsub,

  649.                           x, y, width, height);

  650.     }

  651. }

  652. 

  653. static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,

  654.                        int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)

  655. {

  656.     char *text = dtext->expanded_text;

  657.     uint32_t code = 0;

  658.     int i, x1, y1;

  659.     uint8_t *p;

  660.     Glyph *glyph = NULL;

  661. 

  662.     for (i = 0, p = text; *p; i++) {

  663.         Glyph dummy = { 0 };

  664.         GET_UTF8(code, *p++, continue;);

  665. 

  666.         /* skip new line chars, just go to new line */

  667.         if (code == '\n' || code == '\r' || code == '\t')

  668.             continue;

  669. 

  670.         dummy.code = code;

  671.         glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);

  672. 

  673.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  674.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  675.             return AVERROR(EINVAL);

  676. 

  677.         x1 = dtext->positions[i].x+dtext->x+x;

  678.         y1 = dtext->positions[i].y+dtext->y+y;

  679. 

  680.         if (dtext->is_packed_rgb) {

  681.             draw_glyph_rgb(picref, &glyph->bitmap,

  682.                            x1, y1, width, height,

  683.                            dtext->pixel_step[0], rgbcolor, dtext->rgba_map);

  684.         } else {

  685.             draw_glyph_yuv(picref, &glyph->bitmap,

  686.                            x1, y1, width, height,

  687.                            yuvcolor, dtext->hsub, dtext->vsub);

  688.         }

  689.     }

  690. 

  691.     return 0;

  692. }

  693. 

  694. static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,

  695.                      int width, int height)

  696. {

  697.     DrawTextContext *dtext = ctx->priv;

  698.     uint32_t code = 0, prev_code = 0;

  699.     int x = 0, y = 0, i = 0, ret;

  700.     int max_text_line_w = 0, len;

  701.     int box_w, box_h;

  702.     char *text = dtext->text;

  703.     uint8_t *p;

  704.     int y_min = 32000, y_max = -32000;

  705.     int x_min = 32000, x_max = -32000;

  706.     FT_Vector delta;

  707.     Glyph *glyph = NULL, *prev_glyph = NULL;

  708.     Glyph dummy = { 0 };

  709. 

  710.     time_t now = time(0);

  711.     struct tm ltime;

  712.     uint8_t *buf = dtext->expanded_text;

  713.     int buf_size = dtext->expanded_text_size;

  714. 

  715.     if(dtext->basetime != AV_NOPTS_VALUE)

  716.         now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;

  717. 

  718.     if (!buf) {

  719.         buf_size = 2*strlen(dtext->text)+1;

  720.         buf = av_malloc(buf_size);

  721.     }

  722. 

  723. #if HAVE_LOCALTIME_R

  724.     localtime_r(&now, &ltime);

  725. #else

  726.     if(strchr(dtext->text, '%'))

  727.         ltime= *localtime(&now);

  728. #endif

  729. 

  730.     do {

  731.         *buf = 1;

  732.         if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)

  733.             break;

  734.         buf_size *= 2;

  735.     } while ((buf = av_realloc(buf, buf_size)));

  736. 

  737.     if (dtext->tc_opt_string) {

  738.         char tcbuf[AV_TIMECODE_STR_SIZE];

  739.         av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);

  740.         buf = av_asprintf("%s%s", dtext->text, tcbuf);

  741.     }

  742. 

  743.     if (!buf)

  744.         return AVERROR(ENOMEM);

  745.     text = dtext->expanded_text = buf;

  746.     dtext->expanded_text_size = buf_size;

  747.     if ((len = strlen(text)) > dtext->nb_positions) {

  748.         if (!(dtext->positions =

  749.               av_realloc(dtext->positions, len*sizeof(*dtext->positions))))

  750.             return AVERROR(ENOMEM);

  751.         dtext->nb_positions = len;

  752.     }

  753. 

  754.     x = 0;

  755.     y = 0;

  756. 

  757.     /* load and cache glyphs */

  758.     for (i = 0, p = text; *p; i++) {

  759.         GET_UTF8(code, *p++, continue;);

  760. 

  761.         /* get glyph */

  762.         dummy.code = code;

  763.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  764.         if (!glyph) {

  765.             load_glyph(ctx, &glyph, code);

  766.         }

  767. 

  768.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  769.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  770.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  771.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  772.     }

  773.     dtext->max_glyph_h = y_max - y_min;

  774.     dtext->max_glyph_w = x_max - x_min;

  775. 

  776.     /* compute and save position for each glyph */

  777.     glyph = NULL;

  778.     for (i = 0, p = text; *p; i++) {

  779.         GET_UTF8(code, *p++, continue;);

  780. 

  781.         /* skip the \n in the sequence \r\n */

  782.         if (prev_code == '\r' && code == '\n')

  783.             continue;

  784. 

  785.         prev_code = code;

  786.         if (is_newline(code)) {

  787.             max_text_line_w = FFMAX(max_text_line_w, x);

  788.             y += dtext->max_glyph_h;

  789.             x = 0;

  790.             continue;

  791.         }

  792. 

  793.         /* get glyph */

  794.         prev_glyph = glyph;

  795.         dummy.code = code;

  796.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  797. 

  798.         /* kerning */

  799.         if (dtext->use_kerning && prev_glyph && glyph->code) {

  800.             FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,

  801.                            ft_kerning_default, &delta);

  802.             x += delta.x >> 6;

  803.         }

  804. 

  805.         /* save position */

  806.         dtext->positions[i].x = x + glyph->bitmap_left;

  807.         dtext->positions[i].y = y - glyph->bitmap_top + y_max;

  808.         if (code == '\t') x  = (x / dtext->tabsize + 1)*dtext->tabsize;

  809.         else              x += glyph->advance;

  810.     }

  811. 

  812.     max_text_line_w = FFMAX(x, max_text_line_w);

  813. 

  814.     dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;

  815.     dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;

  816. 

  817.     dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;

  818.     dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;

  819.     dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;

  820.     dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;

  821. 

  822.     dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;

  823. 

  824.     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);

  825.     dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);

  826.     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);

  827.     dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);

  828. 

  829.     if(!dtext->draw)

  830.         return 0;

  831. 

  832.     dtext->x &= ~((1 << dtext->hsub) - 1);

  833.     dtext->y &= ~((1 << dtext->vsub) - 1);

  834. 

  835.     box_w = FFMIN(width - 1 , max_text_line_w);

  836.     box_h = FFMIN(height - 1, y + dtext->max_glyph_h);

  837. 

  838.     /* draw box */

  839.     if (dtext->draw_box)

  840.         drawbox(picref, dtext->x, dtext->y, box_w, box_h,

  841.                 dtext->box_line, dtext->pixel_step, dtext->is_packed_rgb ? dtext->boxcolor_rgba : dtext->boxcolor,

  842.                 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);

  843. 

  844.     if (dtext->shadowx || dtext->shadowy) {

  845.         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,

  846.                                dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)

  847.             return ret;

  848.     }

  849. 

  850.     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,

  851.                            dtext->fontcolor, 0, 0)) < 0)

  852.         return ret;

  853. 

  854.     return 0;

  855. }

  856. 

  857. static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }

  858. 

  859. static void end_frame(AVFilterLink *inlink)

  860. {

  861.     AVFilterContext *ctx = inlink->dst;

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

  863.     DrawTextContext *dtext = ctx->priv;

  864.     AVFilterBufferRef *picref = inlink->cur_buf;

  865. 

  866.     dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?

  867.         NAN : picref->pts * av_q2d(inlink->time_base);

  868. 

  869.     draw_text(ctx, picref, picref->video->w, picref->video->h);

  870. 

  871.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  872.            (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],

  873.            (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],

  874.            dtext->x, dtext->y);

  875. 

  876.     dtext->var_values[VAR_N] += 1.0;

  877. 

  878.     avfilter_draw_slice(outlink, 0, picref->video->h, 1);

  879.     avfilter_end_frame(outlink);

  880. }

  881. 

  882. AVFilter avfilter_vf_drawtext = {

  883.     .name          = "drawtext",

  884.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  885.     .priv_size     = sizeof(DrawTextContext),

  886.     .init          = init,

  887.     .uninit        = uninit,

  888.     .query_formats = query_formats,

  889. 

  890.     .inputs    = (const AVFilterPad[]) {{ .name       = "default",

  891.                                     .type             = AVMEDIA_TYPE_VIDEO,

  892.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  893.                                     .start_frame      = avfilter_null_start_frame,

  894.                                     .draw_slice       = null_draw_slice,

  895.                                     .end_frame        = end_frame,

  896.                                     .config_props     = config_input,

  897.                                     .min_perms        = AV_PERM_WRITE |

  898.                                                         AV_PERM_READ,

  899.                                     .rej_perms        = AV_PERM_PRESERVE },

  900.                                   { .name = NULL}},

  901.     .outputs   = (const AVFilterPad[]) {{ .name       = "default",

  902.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  903.                                   { .name = NULL}},

  904.     .process_command = command,

  905. };