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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/file.h"

  35. #include "libavutil/eval.h"

  36. #include "libavutil/opt.h"

  37. #include "libavutil/random_seed.h"

  38. #include "libavutil/parseutils.h"

  39. #include "libavutil/timecode.h"

  40. #include "libavutil/tree.h"

  41. #include "libavutil/lfg.h"

  42. #include "avfilter.h"

  43. #include "drawutils.h"

  44. 

  45. #undef time

  46. 

  47. #include <ft2build.h>

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

  49. #include FT_FREETYPE_H

  50. #include FT_GLYPH_H

  51. 

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

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

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

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

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

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

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

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

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

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

  62.     "sar",

  63.     "dar",

  64.     "hsub",

  65.     "vsub",

  66.     "x",

  67.     "y",

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

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

  70.     NULL

  71. };

  72. 

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

  74.     "rand"

  75. };

  76. 

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

  78. {

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

  80. }

  81. 

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

  83. 

  84. static const eval_func2 fun2[] = {

  85.     drand,

  86.     NULL

  87. };

  88. 

  89. enum var_name {

  90.     VAR_MAIN_W, VAR_w, VAR_W,

  91.     VAR_MAIN_H, VAR_h, VAR_H,

  92.     VAR_TW, VAR_TEXT_W,

  93.     VAR_TH, VAR_TEXT_H,

  94.     VAR_MAX_GLYPH_W,

  95.     VAR_MAX_GLYPH_H,

  96.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  97.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  98.     VAR_LINE_H, VAR_LH,

  99.     VAR_SAR,

  100.     VAR_DAR,

  101.     VAR_HSUB,

  102.     VAR_VSUB,

  103.     VAR_X,

  104.     VAR_Y,

  105.     VAR_N,

  106.     VAR_T,

  107.     VAR_VARS_NB

  108. };

  109. 

  110. typedef struct {

  111.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

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

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

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

  125.     int shadowx, shadowy;

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

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

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

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

  130. 

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

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

  133.     int tabsize;                    ///< tab size

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

  135. 

  136.     FFDrawContext dc;

  137.     FFDrawColor fontcolor;          ///< foreground color

  138.     FFDrawColor shadowcolor;        ///< shadow color

  139.     FFDrawColor boxcolor;           ///< background color

  140. 

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

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

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

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

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

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

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

  148.     double var_values[VAR_VARS_NB];

  149.     char   *d_expr;

  150.     AVExpr *d_pexpr;

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

  152.     AVLFG  prng;                    ///< random

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

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

  155.     AVTimecode  tc;                 ///< timecode context

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

  157.     int frame_id;

  158. } DrawTextContext;

  159. 

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

  161. 

  162. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  184. 

  185. /* FT_LOAD_* flags */

  186. {"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" },

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

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

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

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

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

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

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

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

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

  196. {"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" },

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

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

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

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

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

  202. {NULL},

  203. };

  204. 

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

  206. {

  207.     return "drawtext";

  208. }

  209. 

  210. static const AVClass drawtext_class = {

  211.     "DrawTextContext",

  212.     drawtext_get_name,

  213.     drawtext_options

  214. };

  215. 

  216. #undef __FTERRORS_H__

  217. #define FT_ERROR_START_LIST {

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

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

  220. 

  221. struct ft_error

  222. {

  223.     int err;

  224.     const char *err_msg;

  225. } static ft_errors[] =

  226. #include FT_ERRORS_H

  227. 

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

  229. 

  230. typedef struct {

  231.     FT_Glyph *glyph;

  232.     uint32_t code;

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

  234.     FT_BBox bbox;

  235.     int advance;

  236.     int bitmap_left;

  237.     int bitmap_top;

  238. } Glyph;

  239. 

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

  241. {

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

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

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

  245. }

  246. 

  247. /**

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

  249.  */

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

  251. {

  252.     DrawTextContext *dtext = ctx->priv;

  253.     Glyph *glyph;

  254.     struct AVTreeNode *node = NULL;

  255.     int ret;

  256. 

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

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

  259.         return AVERROR(EINVAL);

  260. 

  261.     /* save glyph */

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

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

  264.         ret = AVERROR(ENOMEM);

  265.         goto error;

  266.     }

  267.     glyph->code  = code;

  268. 

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

  270.         ret = AVERROR(EINVAL);

  271.         goto error;

  272.     }

  273. 

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

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

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

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

  278. 

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

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

  281. 

  282.     /* cache the newly created glyph */

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

  284.         ret = AVERROR(ENOMEM);

  285.         goto error;

  286.     }

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

  288. 

  289.     if (glyph_ptr)

  290.         *glyph_ptr = glyph;

  291.     return 0;

  292. 

  293. error:

  294.     if (glyph)

  295.         av_freep(&glyph->glyph);

  296.     av_freep(&glyph);

  297.     av_freep(&node);

  298.     return ret;

  299. }

  300. 

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

  302. {

  303.     int err;

  304.     DrawTextContext *dtext = ctx->priv;

  305.     Glyph *glyph;

  306. 

  307.     dtext->class = &drawtext_class;

  308.     av_opt_set_defaults(dtext);

  309. 

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

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

  312.         return err;

  313.     }

  314. 

  315.     if (!dtext->fontfile) {

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

  317.         return AVERROR(EINVAL);

  318.     }

  319. 

  320.     if (dtext->textfile) {

  321.         uint8_t *textbuf;

  322.         size_t textbuf_size;

  323. 

  324.         if (dtext->text) {

  325.             av_log(ctx, AV_LOG_ERROR,

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

  327.             return AVERROR(EINVAL);

  328.         }

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

  330.             av_log(ctx, AV_LOG_ERROR,

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

  332.                    dtext->textfile);

  333.             return err;

  334.         }

  335. 

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

  337.             return AVERROR(ENOMEM);

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

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

  340.         av_file_unmap(textbuf, textbuf_size);

  341.     }

  342. 

  343.     if (dtext->tc_opt_string) {

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

  345.                                                dtext->tc_opt_string, ctx);

  346.         if (ret < 0)

  347.             return ret;

  348.         if (dtext->tc24hmax)

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

  350.         if (!dtext->text)

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

  352.     }

  353. 

  354.     if (!dtext->text) {

  355.         av_log(ctx, AV_LOG_ERROR,

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

  357.         return AVERROR(EINVAL);

  358.     }

  359. 

  360.     if ((err = av_parse_color(dtext->fontcolor.rgba, dtext->fontcolor_string, -1, ctx))) {

  361.         av_log(ctx, AV_LOG_ERROR,

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

  363.         return err;

  364.     }

  365. 

  366.     if ((err = av_parse_color(dtext->boxcolor.rgba, dtext->boxcolor_string, -1, ctx))) {

  367.         av_log(ctx, AV_LOG_ERROR,

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

  369.         return err;

  370.     }

  371. 

  372.     if ((err = av_parse_color(dtext->shadowcolor.rgba, dtext->shadowcolor_string, -1, ctx))) {

  373.         av_log(ctx, AV_LOG_ERROR,

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

  375.         return err;

  376.     }

  377. 

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

  379.         av_log(ctx, AV_LOG_ERROR,

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

  381.         return AVERROR(EINVAL);

  382.     }

  383. 

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

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

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

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

  388.         return AVERROR(EINVAL);

  389.     }

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

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

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

  393.         return AVERROR(EINVAL);

  394.     }

  395. 

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

  397. 

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

  399.     load_glyph(ctx, NULL, 0);

  400. 

  401.     /* set the tabsize in pixels */

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

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

  404.         return err;

  405.     }

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

  407. 

  408.     return 0;

  409. }

  410. 

  411. static int query_formats(AVFilterContext *ctx)

  412. {

  413.     avfilter_set_common_pixel_formats(ctx, ff_draw_supported_pixel_formats(0));

  414.     return 0;

  415. }

  416. 

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

  418. {

  419.     av_free(elem);

  420.     return 0;

  421. }

  422. 

  423. static av_cold void uninit(AVFilterContext *ctx)

  424. {

  425.     DrawTextContext *dtext = ctx->priv;

  426. 

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

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

  429. 

  430.     av_freep(&dtext->boxcolor_string);

  431.     av_freep(&dtext->expanded_text);

  432.     av_freep(&dtext->fontcolor_string);

  433.     av_freep(&dtext->fontfile);

  434.     av_freep(&dtext->shadowcolor_string);

  435.     av_freep(&dtext->text);

  436.     av_freep(&dtext->x_expr);

  437.     av_freep(&dtext->y_expr);

  438. 

  439.     av_freep(&dtext->positions);

  440.     dtext->nb_positions = 0;

  441. 

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

  443.     av_tree_destroy(dtext->glyphs);

  444.     dtext->glyphs = NULL;

  445. 

  446.     FT_Done_Face(dtext->face);

  447.     FT_Done_FreeType(dtext->library);

  448. }

  449. 

  450. static inline int is_newline(uint32_t c)

  451. {

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

  453. }

  454. 

  455. static int config_input(AVFilterLink *inlink)

  456. {

  457.     AVFilterContext *ctx = inlink->dst;

  458.     DrawTextContext *dtext = ctx->priv;

  459.     int ret;

  460. 

  461.     ff_draw_init(&dtext->dc, inlink->format, 0);

  462.     ff_draw_color(&dtext->dc, &dtext->fontcolor,   dtext->fontcolor.rgba);

  463.     ff_draw_color(&dtext->dc, &dtext->shadowcolor, dtext->shadowcolor.rgba);

  464.     ff_draw_color(&dtext->dc, &dtext->boxcolor,    dtext->boxcolor.rgba);

  465. 

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

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

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

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

  470.     dtext->var_values[VAR_HSUB]  = 1 << dtext->dc.hsub_max;

  471.     dtext->var_values[VAR_VSUB]  = 1 << dtext->dc.vsub_max;

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

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

  474.     if (!dtext->reinit)

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

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

  477. 

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

  479. 

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

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

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

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

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

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

  486. 

  487.         return AVERROR(EINVAL);

  488. 

  489.     return 0;

  490. }

  491. 

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

  493. {

  494.     DrawTextContext *dtext = ctx->priv;

  495. 

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

  497.         int ret;

  498.         uninit(ctx);

  499.         dtext->reinit = 1;

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

  501.             return ret;

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

  503.     }

  504. 

  505.     return AVERROR(ENOSYS);

  506. }

  507. 

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

  509.                        int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)

  510. {

  511.     char *text = dtext->expanded_text;

  512.     uint32_t code = 0;

  513.     int i, x1, y1;

  514.     uint8_t *p;

  515.     Glyph *glyph = NULL;

  516. 

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

  518.         Glyph dummy = { 0 };

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

  520. 

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

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

  523.             continue;

  524. 

  525.         dummy.code = code;

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

  527. 

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

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

  530.             return AVERROR(EINVAL);

  531. 

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

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

  534. 

  535.         ff_blend_mask(&dtext->dc, color,

  536.                       picref->data, picref->linesize, width, height,

  537.                       glyph->bitmap.buffer, glyph->bitmap.pitch,

  538.                       glyph->bitmap.width, glyph->bitmap.rows,

  539.                       glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  540.                       0, x1, y1);

  541.     }

  542. 

  543.     return 0;

  544. }

  545. 

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

  547.                      int width, int height)

  548. {

  549.     DrawTextContext *dtext = ctx->priv;

  550.     uint32_t code = 0, prev_code = 0;

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

  552.     int max_text_line_w = 0, len;

  553.     int box_w, box_h;

  554.     char *text = dtext->text;

  555.     uint8_t *p;

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

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

  558.     FT_Vector delta;

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

  560.     Glyph dummy = { 0 };

  561. 

  562.     time_t now = time(0);

  563.     struct tm ltime;

  564.     uint8_t *buf = dtext->expanded_text;

  565.     int buf_size = dtext->expanded_text_size;

  566. 

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

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

  569. 

  570.     if (!buf) {

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

  572.         buf = av_malloc(buf_size);

  573.     }

  574. 

  575. #if HAVE_LOCALTIME_R

  576.     localtime_r(&now, &ltime);

  577. #else

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

  579.         ltime= *localtime(&now);

  580. #endif

  581. 

  582.     do {

  583.         *buf = 1;

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

  585.             break;

  586.         buf_size *= 2;

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

  588. 

  589.     if (dtext->tc_opt_string) {

  590.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

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

  593.     }

  594. 

  595.     if (!buf)

  596.         return AVERROR(ENOMEM);

  597.     text = dtext->expanded_text = buf;

  598.     dtext->expanded_text_size = buf_size;

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

  600.         if (!(dtext->positions =

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

  602.             return AVERROR(ENOMEM);

  603.         dtext->nb_positions = len;

  604.     }

  605. 

  606.     x = 0;

  607.     y = 0;

  608. 

  609.     /* load and cache glyphs */

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

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

  612. 

  613.         /* get glyph */

  614.         dummy.code = code;

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

  616.         if (!glyph) {

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

  618.         }

  619. 

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

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

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

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

  624.     }

  625.     dtext->max_glyph_h = y_max - y_min;

  626.     dtext->max_glyph_w = x_max - x_min;

  627. 

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

  629.     glyph = NULL;

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

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

  632. 

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

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

  635.             continue;

  636. 

  637.         prev_code = code;

  638.         if (is_newline(code)) {

  639.             max_text_line_w = FFMAX(max_text_line_w, x);

  640.             y += dtext->max_glyph_h;

  641.             x = 0;

  642.             continue;

  643.         }

  644. 

  645.         /* get glyph */

  646.         prev_glyph = glyph;

  647.         dummy.code = code;

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

  649. 

  650.         /* kerning */

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

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

  653.                            ft_kerning_default, &delta);

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

  655.         }

  656. 

  657.         /* save position */

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

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

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

  661.         else              x += glyph->advance;

  662.     }

  663. 

  664.     max_text_line_w = FFMAX(x, max_text_line_w);

  665. 

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

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

  668. 

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

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

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

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

  673. 

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

  675. 

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

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

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

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

  680. 

  681.     if(!dtext->draw)

  682.         return 0;

  683. 

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

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

  686. 

  687.     /* draw box */

  688.     if (dtext->draw_box)

  689.         ff_blend_rectangle(&dtext->dc, &dtext->boxcolor,

  690.                            picref->data, picref->linesize, width, height,

  691.                            dtext->x, dtext->y, box_w, box_h);

  692. 

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

  694.         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor.rgba,

  695.                                &dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)

  696.             return ret;

  697.     }

  698. 

  699.     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor.rgba,

  700.                            &dtext->fontcolor, 0, 0)) < 0)

  701.         return ret;

  702. 

  703.     return 0;

  704. }

  705. 

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

  707. 

  708. static void end_frame(AVFilterLink *inlink)

  709. {

  710.     AVFilterContext *ctx = inlink->dst;

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

  712.     DrawTextContext *dtext = ctx->priv;

  713.     AVFilterBufferRef *picref = inlink->cur_buf;

  714. 

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

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

  717. 

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

  719. 

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

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

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

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

  724. 

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

  726. 

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

  728.     avfilter_end_frame(outlink);

  729. }

  730. 

  731. AVFilter avfilter_vf_drawtext = {

  732.     .name          = "drawtext",

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

  734.     .priv_size     = sizeof(DrawTextContext),

  735.     .init          = init,

  736.     .uninit        = uninit,

  737.     .query_formats = query_formats,

  738. 

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

  740.                                     .type             = AVMEDIA_TYPE_VIDEO,

  741.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  742.                                     .start_frame      = avfilter_null_start_frame,

  743.                                     .draw_slice       = null_draw_slice,

  744.                                     .end_frame        = end_frame,

  745.                                     .config_props     = config_input,

  746.                                     .min_perms        = AV_PERM_WRITE |

  747.                                                         AV_PERM_READ,

  748.                                     .rej_perms        = AV_PERM_PRESERVE },

  749.                                   { .name = NULL}},

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

  751.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  752.                                   { .name = NULL}},

  753.     .process_command = command,

  754. };