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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 "config.h"

  30. 

  31. #if HAVE_SYS_TIME_H

  32. #include <sys/time.h>

  33. #endif

  34. #include <sys/types.h>

  35. #include <sys/stat.h>

  36. #include <time.h>

  37. #if HAVE_UNISTD_H

  38. #include <unistd.h>

  39. #endif

  40. #include <fenv.h>

  41. 

  42. #if CONFIG_LIBFONTCONFIG

  43. #include <fontconfig/fontconfig.h>

  44. #endif

  45. 

  46. #include "libavutil/avstring.h"

  47. #include "libavutil/bprint.h"

  48. #include "libavutil/common.h"

  49. #include "libavutil/file.h"

  50. #include "libavutil/eval.h"

  51. #include "libavutil/opt.h"

  52. #include "libavutil/random_seed.h"

  53. #include "libavutil/parseutils.h"

  54. #include "libavutil/timecode.h"

  55. #include "libavutil/tree.h"

  56. #include "libavutil/lfg.h"

  57. #include "avfilter.h"

  58. #include "drawutils.h"

  59. #include "formats.h"

  60. #include "internal.h"

  61. #include "video.h"

  62. 

  63. #if CONFIG_LIBFRIBIDI

  64. #include <fribidi.h>

  65. #endif

  66. 

  67. #include <ft2build.h>

  68. #include FT_FREETYPE_H

  69. #include FT_GLYPH_H

  70. #include FT_STROKER_H

  71. 

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

  73.     "dar",

  74.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  83.     "sar",

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

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

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

  87.     "x",

  88.     "y",

  89.     "pict_type",

  90.     NULL

  91. };

  92. 

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

  94.     "rand"

  95. };

  96. 

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

  98. {

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

  100. }

  101. 

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

  103. 

  104. static const eval_func2 fun2[] = {

  105.     drand,

  106.     NULL

  107. };

  108. 

  109. enum var_name {

  110.     VAR_DAR,

  111.     VAR_HSUB, VAR_VSUB,

  112.     VAR_LINE_H, VAR_LH,

  113.     VAR_MAIN_H, VAR_h, VAR_H,

  114.     VAR_MAIN_W, VAR_w, VAR_W,

  115.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  116.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  117.     VAR_MAX_GLYPH_H,

  118.     VAR_MAX_GLYPH_W,

  119.     VAR_N,

  120.     VAR_SAR,

  121.     VAR_T,

  122.     VAR_TEXT_H, VAR_TH,

  123.     VAR_TEXT_W, VAR_TW,

  124.     VAR_X,

  125.     VAR_Y,

  126.     VAR_PICT_TYPE,

  127.     VAR_VARS_NB

  128. };

  129. 

  130. enum expansion_mode {

  131.     EXP_NONE,

  132.     EXP_NORMAL,

  133.     EXP_STRFTIME,

  134. };

  135. 

  136. typedef struct DrawTextContext {

  137.     const AVClass *class;

  138.     enum expansion_mode exp_mode;   ///< expansion mode to use for the text

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

  140. #if CONFIG_LIBFONTCONFIG

  141.     uint8_t *font;              ///< font to be used

  142. #endif

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

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

  145.     AVBPrint expanded_text;         ///< used to contain the expanded text

  146.     uint8_t *fontcolor_expr;        ///< fontcolor expression to evaluate

  147.     AVBPrint expanded_fontcolor;    ///< used to contain the expanded fontcolor spec

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

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

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

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

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

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

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

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

  156.     int shadowx, shadowy;

  157.     int borderw;                    ///< border width

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

  159. 

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

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

  162.     int tabsize;                    ///< tab size

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

  164. 

  165.     FFDrawContext dc;

  166.     FFDrawColor fontcolor;          ///< foreground color

  167.     FFDrawColor shadowcolor;        ///< shadow color

  168.     FFDrawColor bordercolor;        ///< border color

  169.     FFDrawColor boxcolor;           ///< background color

  170. 

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

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

  173.     FT_Stroker stroker;             ///< freetype stroker handle

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

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

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

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

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

  179.     double var_values[VAR_VARS_NB];

  180. #if FF_API_DRAWTEXT_OLD_TIMELINE

  181.     char   *draw_expr;              ///< expression for draw

  182.     AVExpr *draw_pexpr;             ///< parsed expression for draw

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

  184. #endif

  185.     AVLFG  prng;                    ///< random

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

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

  188.     AVTimecode  tc;                 ///< timecode context

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

  190.     int reload;                     ///< reload text file for each frame

  191.     int start_number;               ///< starting frame number for n/frame_num var

  192. #if CONFIG_LIBFRIBIDI

  193.     int text_shaping;               ///< 1 to shape the text before drawing it

  194. #endif

  195.     AVDictionary *metadata;

  196. } DrawTextContext;

  197. 

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

  199. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  200. 

  201. static const AVOption drawtext_options[]= {

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

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

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

  205.     {"fontcolor",   "set foreground color", OFFSET(fontcolor.rgba),     AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

  206.     {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS},

  207.     {"boxcolor",    "set box color",        OFFSET(boxcolor.rgba),      AV_OPT_TYPE_COLOR,  {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},

  208.     {"bordercolor", "set border color",     OFFSET(bordercolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

  209.     {"shadowcolor", "set shadow color",     OFFSET(shadowcolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

  210.     {"box",         "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.i64=0},     0,        1       , FLAGS},

  211.     {"fontsize",    "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.i64=0},     0,        INT_MAX , FLAGS},

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

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

  214.     {"shadowx",     "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},

  215.     {"shadowy",     "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},

  216.     {"borderw",     "set border width",     OFFSET(borderw),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},

  217.     {"tabsize",     "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.i64=4},     0,        INT_MAX , FLAGS},

  218.     {"basetime",    "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},

  219. #if FF_API_DRAWTEXT_OLD_TIMELINE

  220.     {"draw",        "if false do not draw (deprecated)", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str=NULL},   CHAR_MIN, CHAR_MAX, FLAGS},

  221. #endif

  222. #if CONFIG_LIBFONTCONFIG

  223.     { "font",        "Font name",            OFFSET(font),               AV_OPT_TYPE_STRING, { .str = "Sans" },           .flags = FLAGS },

  224. #endif

  225. 

  226.     {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},

  227.         {"none",     "set no expansion",                    OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE},     0, 0, FLAGS, "expansion"},

  228.         {"normal",   "set normal expansion",                OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL},   0, 0, FLAGS, "expansion"},

  229.         {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},

  230. 

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

  232.     {"tc24hmax",        "set 24 hours max (timecode only)", OFFSET(tc24hmax),      AV_OPT_TYPE_INT,      {.i64=0},           0,        1, FLAGS},

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

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

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

  236.     {"reload",     "reload text file for each frame",                       OFFSET(reload),     AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},

  237.     {"fix_bounds", "if true, check and fix text coords to avoid clipping",  OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},

  238.     {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},

  239. 

  240. #if CONFIG_LIBFRIBIDI

  241.     {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},

  242. #endif

  243. 

  244.     /* FT_LOAD_* flags */

  245.     { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 0, INT_MAX, FLAGS, "ft_load_flags" },

  246.         { "default",                     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT },                     .flags = FLAGS, .unit = "ft_load_flags" },

  247.         { "no_scale",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE },                    .flags = FLAGS, .unit = "ft_load_flags" },

  248.         { "no_hinting",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING },                  .flags = FLAGS, .unit = "ft_load_flags" },

  249.         { "render",                      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER },                      .flags = FLAGS, .unit = "ft_load_flags" },

  250.         { "no_bitmap",                   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP },                   .flags = FLAGS, .unit = "ft_load_flags" },

  251.         { "vertical_layout",             NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT },             .flags = FLAGS, .unit = "ft_load_flags" },

  252.         { "force_autohint",              NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT },              .flags = FLAGS, .unit = "ft_load_flags" },

  253.         { "crop_bitmap",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP },                 .flags = FLAGS, .unit = "ft_load_flags" },

  254.         { "pedantic",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC },                    .flags = FLAGS, .unit = "ft_load_flags" },

  255.         { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },

  256.         { "no_recurse",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE },                  .flags = FLAGS, .unit = "ft_load_flags" },

  257.         { "ignore_transform",            NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM },            .flags = FLAGS, .unit = "ft_load_flags" },

  258.         { "monochrome",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME },                  .flags = FLAGS, .unit = "ft_load_flags" },

  259.         { "linear_design",               NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN },               .flags = FLAGS, .unit = "ft_load_flags" },

  260.         { "no_autohint",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT },                 .flags = FLAGS, .unit = "ft_load_flags" },

  261.     { NULL }

  262. };

  263. 

  264. AVFILTER_DEFINE_CLASS(drawtext);

  265. 

  266. #undef __FTERRORS_H__

  267. #define FT_ERROR_START_LIST {

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

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

  270. 

  271. struct ft_error

  272. {

  273.     int err;

  274.     const char *err_msg;

  275. } static ft_errors[] =

  276. #include FT_ERRORS_H

  277. 

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

  279. 

  280. typedef struct Glyph {

  281.     FT_Glyph glyph;

  282.     FT_Glyph border_glyph;

  283.     uint32_t code;

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

  285.     FT_Bitmap border_bitmap; ///< array holding bitmaps of font border

  286.     FT_BBox bbox;

  287.     int advance;

  288.     int bitmap_left;

  289.     int bitmap_top;

  290. } Glyph;

  291. 

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

  293. {

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

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

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

  297. }

  298. 

  299. /**

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

  301.  */

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

  303. {

  304.     DrawTextContext *s = ctx->priv;

  305.     FT_BitmapGlyph bitmapglyph;

  306.     Glyph *glyph;

  307.     struct AVTreeNode *node = NULL;

  308.     int ret;

  309. 

  310.     /* load glyph into s->face->glyph */

  311.     if (FT_Load_Char(s->face, code, s->ft_load_flags))

  312.         return AVERROR(EINVAL);

  313. 

  314.     glyph = av_mallocz(sizeof(*glyph));

  315.     if (!glyph) {

  316.         ret = AVERROR(ENOMEM);

  317.         goto error;

  318.     }

  319.     glyph->code  = code;

  320. 

  321.     if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {

  322.         ret = AVERROR(EINVAL);

  323.         goto error;

  324.     }

  325.     if (s->borderw) {

  326.         glyph->border_glyph = glyph->glyph;

  327.         if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||

  328.             FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {

  329.             ret = AVERROR_EXTERNAL;

  330.             goto error;

  331.         }

  332.         bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;

  333.         glyph->border_bitmap = bitmapglyph->bitmap;

  334.     }

  335.     if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {

  336.         ret = AVERROR_EXTERNAL;

  337.         goto error;

  338.     }

  339.     bitmapglyph = (FT_BitmapGlyph) glyph->glyph;

  340. 

  341.     glyph->bitmap      = bitmapglyph->bitmap;

  342.     glyph->bitmap_left = bitmapglyph->left;

  343.     glyph->bitmap_top  = bitmapglyph->top;

  344.     glyph->advance     = s->face->glyph->advance.x >> 6;

  345. 

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

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

  348. 

  349.     /* cache the newly created glyph */

  350.     if (!(node = av_tree_node_alloc())) {

  351.         ret = AVERROR(ENOMEM);

  352.         goto error;

  353.     }

  354.     av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);

  355. 

  356.     if (glyph_ptr)

  357.         *glyph_ptr = glyph;

  358.     return 0;

  359. 

  360. error:

  361.     if (glyph)

  362.         av_freep(&glyph->glyph);

  363. 

  364.     av_freep(&glyph);

  365.     av_freep(&node);

  366.     return ret;

  367. }

  368. 

  369. static int load_font_file(AVFilterContext *ctx, const char *path, int index)

  370. {

  371.     DrawTextContext *s = ctx->priv;

  372.     int err;

  373. 

  374.     err = FT_New_Face(s->library, path, index, &s->face);

  375.     if (err) {

  376.         av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",

  377.                s->fontfile, FT_ERRMSG(err));

  378.         return AVERROR(EINVAL);

  379.     }

  380.     return 0;

  381. }

  382. 

  383. #if CONFIG_LIBFONTCONFIG

  384. static int load_font_fontconfig(AVFilterContext *ctx)

  385. {

  386.     DrawTextContext *s = ctx->priv;

  387.     FcConfig *fontconfig;

  388.     FcPattern *pat, *best;

  389.     FcResult result = FcResultMatch;

  390.     FcChar8 *filename;

  391.     int index;

  392.     double size;

  393.     int err = AVERROR(ENOENT);

  394. 

  395.     fontconfig = FcInitLoadConfigAndFonts();

  396.     if (!fontconfig) {

  397.         av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");

  398.         return AVERROR_UNKNOWN;

  399.     }

  400.     pat = FcNameParse(s->fontfile ? s->fontfile :

  401.                           (uint8_t *)(intptr_t)"default");

  402.     if (!pat) {

  403.         av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");

  404.         return AVERROR(EINVAL);

  405.     }

  406. 

  407.     FcPatternAddString(pat, FC_FAMILY, s->font);

  408.     if (s->fontsize)

  409.         FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);

  410. 

  411.     FcDefaultSubstitute(pat);

  412. 

  413.     if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {

  414.         av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */

  415.         FcPatternDestroy(pat);

  416.         return AVERROR(ENOMEM);

  417.     }

  418. 

  419.     best = FcFontMatch(fontconfig, pat, &result);

  420.     FcPatternDestroy(pat);

  421. 

  422.     if (!best || result != FcResultMatch) {

  423.         av_log(ctx, AV_LOG_ERROR,

  424.                "Cannot find a valid font for the family %s\n",

  425.                s->font);

  426.         goto fail;

  427.     }

  428. 

  429.     if (

  430.         FcPatternGetInteger(best, FC_INDEX, 0, &index   ) != FcResultMatch ||

  431.         FcPatternGetDouble (best, FC_SIZE,  0, &size    ) != FcResultMatch) {

  432.         av_log(ctx, AV_LOG_ERROR, "impossible to find font information");

  433.         return AVERROR(EINVAL);

  434.     }

  435. 

  436.     if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {

  437.         av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",

  438.                s->font);

  439.         goto fail;

  440.     }

  441. 

  442.     av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);

  443.     if (!s->fontsize)

  444.         s->fontsize = size + 0.5;

  445. 

  446.     err = load_font_file(ctx, filename, index);

  447.     if (err)

  448.         return err;

  449.     FcConfigDestroy(fontconfig);

  450. fail:

  451.     FcPatternDestroy(best);

  452.     return err;

  453. }

  454. #endif

  455. 

  456. static int load_font(AVFilterContext *ctx)

  457. {

  458.     DrawTextContext *s = ctx->priv;

  459.     int err;

  460. 

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

  462.     err = load_font_file(ctx, s->fontfile, 0);

  463.     if (!err)

  464.         return 0;

  465. #if CONFIG_LIBFONTCONFIG

  466.     err = load_font_fontconfig(ctx);

  467.     if (!err)

  468.         return 0;

  469. #endif

  470.     return err;

  471. }

  472. 

  473. static int load_textfile(AVFilterContext *ctx)

  474. {

  475.     DrawTextContext *s = ctx->priv;

  476.     int err;

  477.     uint8_t *textbuf;

  478.     uint8_t *tmp;

  479.     size_t textbuf_size;

  480. 

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

  482.         av_log(ctx, AV_LOG_ERROR,

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

  484.                s->textfile);

  485.         return err;

  486.     }

  487. 

  488.     if (!(tmp = av_realloc(s->text, textbuf_size + 1))) {

  489.         av_file_unmap(textbuf, textbuf_size);

  490.         return AVERROR(ENOMEM);

  491.     }

  492.     s->text = tmp;

  493.     memcpy(s->text, textbuf, textbuf_size);

  494.     s->text[textbuf_size] = 0;

  495.     av_file_unmap(textbuf, textbuf_size);

  496. 

  497.     return 0;

  498. }

  499. 

  500. static inline int is_newline(uint32_t c)

  501. {

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

  503. }

  504. 

  505. #if CONFIG_LIBFRIBIDI

  506. static int shape_text(AVFilterContext *ctx)

  507. {

  508.     DrawTextContext *s = ctx->priv;

  509.     uint8_t *tmp;

  510.     int ret = AVERROR(ENOMEM);

  511.     static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |

  512.                                       FRIBIDI_FLAGS_ARABIC;

  513.     FriBidiChar *unicodestr = NULL;

  514.     FriBidiStrIndex len;

  515.     FriBidiParType direction = FRIBIDI_PAR_LTR;

  516.     FriBidiStrIndex line_start = 0;

  517.     FriBidiStrIndex line_end = 0;

  518.     FriBidiLevel *embedding_levels = NULL;

  519.     FriBidiArabicProp *ar_props = NULL;

  520.     FriBidiCharType *bidi_types = NULL;

  521.     FriBidiStrIndex i,j;

  522. 

  523.     len = strlen(s->text);

  524.     if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) {

  525.         goto out;

  526.     }

  527.     len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,

  528.                                      s->text, len, unicodestr);

  529. 

  530.     bidi_types = av_malloc_array(len, sizeof(*bidi_types));

  531.     if (!bidi_types) {

  532.         goto out;

  533.     }

  534. 

  535.     fribidi_get_bidi_types(unicodestr, len, bidi_types);

  536. 

  537.     embedding_levels = av_malloc_array(len, sizeof(*embedding_levels));

  538.     if (!embedding_levels) {

  539.         goto out;

  540.     }

  541. 

  542.     if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction,

  543.                                           embedding_levels)) {

  544.         goto out;

  545.     }

  546. 

  547.     ar_props = av_malloc_array(len, sizeof(*ar_props));

  548.     if (!ar_props) {

  549.         goto out;

  550.     }

  551. 

  552.     fribidi_get_joining_types(unicodestr, len, ar_props);

  553.     fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props);

  554.     fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr);

  555. 

  556.     for (line_end = 0, line_start = 0; line_end < len; line_end++) {

  557.         if (is_newline(unicodestr[line_end]) || line_end == len - 1) {

  558.             if (!fribidi_reorder_line(flags, bidi_types,

  559.                                       line_end - line_start + 1, line_start,

  560.                                       direction, embedding_levels, unicodestr,

  561.                                       NULL)) {

  562.                 goto out;

  563.             }

  564.             line_start = line_end + 1;

  565.         }

  566.     }

  567. 

  568.     /* Remove zero-width fill chars put in by libfribidi */

  569.     for (i = 0, j = 0; i < len; i++)

  570.         if (unicodestr[i] != FRIBIDI_CHAR_FILL)

  571.             unicodestr[j++] = unicodestr[i];

  572.     len = j;

  573. 

  574.     if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) {

  575.         /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */

  576.         goto out;

  577.     }

  578. 

  579.     s->text = tmp;

  580.     len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,

  581.                                      unicodestr, len, s->text);

  582.     ret = 0;

  583. 

  584. out:

  585.     av_free(unicodestr);

  586.     av_free(embedding_levels);

  587.     av_free(ar_props);

  588.     av_free(bidi_types);

  589.     return ret;

  590. }

  591. #endif

  592. 

  593. static av_cold int init(AVFilterContext *ctx)

  594. {

  595.     int err;

  596.     DrawTextContext *s = ctx->priv;

  597.     Glyph *glyph;

  598. 

  599. #if FF_API_DRAWTEXT_OLD_TIMELINE

  600.     if (s->draw_expr)

  601.         av_log(ctx, AV_LOG_WARNING, "'draw' option is deprecated and will be removed soon, "

  602.                "you are encouraged to use the generic timeline support through the 'enable' option\n");

  603. #endif

  604. 

  605.     if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {

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

  607.         return AVERROR(EINVAL);

  608.     }

  609. 

  610.     if (s->textfile) {

  611.         if (s->text) {

  612.             av_log(ctx, AV_LOG_ERROR,

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

  614.             return AVERROR(EINVAL);

  615.         }

  616.         if ((err = load_textfile(ctx)) < 0)

  617.             return err;

  618.     }

  619. 

  620. #if CONFIG_LIBFRIBIDI

  621.     if (s->text_shaping)

  622.         if ((err = shape_text(ctx)) < 0)

  623.             return err;

  624. #endif

  625. 

  626.     if (s->reload && !s->textfile)

  627.         av_log(ctx, AV_LOG_WARNING, "No file to reload\n");

  628. 

  629.     if (s->tc_opt_string) {

  630.         int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,

  631.                                                s->tc_opt_string, ctx);

  632.         if (ret < 0)

  633.             return ret;

  634.         if (s->tc24hmax)

  635.             s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;

  636.         if (!s->text)

  637.             s->text = av_strdup("");

  638.     }

  639. 

  640.     if (!s->text) {

  641.         av_log(ctx, AV_LOG_ERROR,

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

  643.         return AVERROR(EINVAL);

  644.     }

  645. 

  646.     if ((err = FT_Init_FreeType(&(s->library)))) {

  647.         av_log(ctx, AV_LOG_ERROR,

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

  649.         return AVERROR(EINVAL);

  650.     }

  651. 

  652.     err = load_font(ctx);

  653.     if (err)

  654.         return err;

  655.     if (!s->fontsize)

  656.         s->fontsize = 16;

  657.     if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {

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

  659.                s->fontsize, FT_ERRMSG(err));

  660.         return AVERROR(EINVAL);

  661.     }

  662. 

  663.     if (s->borderw) {

  664.         if (FT_Stroker_New(s->library, &s->stroker)) {

  665.             av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");

  666.             return AVERROR_EXTERNAL;

  667.         }

  668.         FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,

  669.                        FT_STROKER_LINEJOIN_ROUND, 0);

  670.     }

  671. 

  672.     s->use_kerning = FT_HAS_KERNING(s->face);

  673. 

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

  675.     load_glyph(ctx, NULL, 0);

  676. 

  677.     /* set the tabsize in pixels */

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

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

  680.         return err;

  681.     }

  682.     s->tabsize *= glyph->advance;

  683. 

  684.     if (s->exp_mode == EXP_STRFTIME &&

  685.         (strchr(s->text, '%') || strchr(s->text, '\\')))

  686.         av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");

  687. 

  688.     av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);

  689.     av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED);

  690. 

  691.     return 0;

  692. }

  693. 

  694. static int query_formats(AVFilterContext *ctx)

  695. {

  696.     ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));

  697.     return 0;

  698. }

  699. 

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

  701. {

  702.     Glyph *glyph = elem;

  703. 

  704.     FT_Done_Glyph(glyph->glyph);

  705.     FT_Done_Glyph(glyph->border_glyph);

  706.     av_free(elem);

  707.     return 0;

  708. }

  709. 

  710. static av_cold void uninit(AVFilterContext *ctx)

  711. {

  712.     DrawTextContext *s = ctx->priv;

  713. 

  714.     av_expr_free(s->x_pexpr);

  715.     av_expr_free(s->y_pexpr);

  716. #if FF_API_DRAWTEXT_OLD_TIMELINE

  717.     av_expr_free(s->draw_pexpr);

  718.     s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;

  719. #endif

  720.     av_freep(&s->positions);

  721.     s->nb_positions = 0;

  722. 

  723. 

  724.     av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);

  725.     av_tree_destroy(s->glyphs);

  726.     s->glyphs = NULL;

  727. 

  728.     FT_Done_Face(s->face);

  729.     FT_Stroker_Done(s->stroker);

  730.     FT_Done_FreeType(s->library);

  731. 

  732.     av_bprint_finalize(&s->expanded_text, NULL);

  733.     av_bprint_finalize(&s->expanded_fontcolor, NULL);

  734. }

  735. 

  736. static int config_input(AVFilterLink *inlink)

  737. {

  738.     AVFilterContext *ctx = inlink->dst;

  739.     DrawTextContext *s = ctx->priv;

  740.     int ret;

  741. 

  742.     ff_draw_init(&s->dc, inlink->format, 0);

  743.     ff_draw_color(&s->dc, &s->fontcolor,   s->fontcolor.rgba);

  744.     ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);

  745.     ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);

  746.     ff_draw_color(&s->dc, &s->boxcolor,    s->boxcolor.rgba);

  747. 

  748.     s->var_values[VAR_w]     = s->var_values[VAR_W]     = s->var_values[VAR_MAIN_W] = inlink->w;

  749.     s->var_values[VAR_h]     = s->var_values[VAR_H]     = s->var_values[VAR_MAIN_H] = inlink->h;

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

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

  752.     s->var_values[VAR_HSUB]  = 1 << s->dc.hsub_max;

  753.     s->var_values[VAR_VSUB]  = 1 << s->dc.vsub_max;

  754.     s->var_values[VAR_X]     = NAN;

  755.     s->var_values[VAR_Y]     = NAN;

  756.     s->var_values[VAR_T]     = NAN;

  757. 

  758.     av_lfg_init(&s->prng, av_get_random_seed());

  759. 

  760.     av_expr_free(s->x_pexpr);

  761.     av_expr_free(s->y_pexpr);

  762. #if FF_API_DRAWTEXT_OLD_TIMELINE

  763.     av_expr_free(s->draw_pexpr);

  764.     s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;

  765. #else

  766.     s->x_pexpr = s->y_pexpr = NULL;

  767. #endif

  768. 

  769.     if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,

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

  771.         (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,

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

  773. 

  774.         return AVERROR(EINVAL);

  775. #if FF_API_DRAWTEXT_OLD_TIMELINE

  776.     if (s->draw_expr &&

  777.         (ret = av_expr_parse(&s->draw_pexpr, s->draw_expr, var_names,

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

  779.         return ret;

  780. #endif

  781. 

  782.     return 0;

  783. }

  784. 

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

  786. {

  787.     DrawTextContext *s = ctx->priv;

  788. 

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

  790.         int ret;

  791.         uninit(ctx);

  792.         s->reinit = 1;

  793.         if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)

  794.             return ret;

  795.         if ((ret = init(ctx)) < 0)

  796.             return ret;

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

  798.     }

  799. 

  800.     return AVERROR(ENOSYS);

  801. }

  802. 

  803. static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,

  804.                           char *fct, unsigned argc, char **argv, int tag)

  805. {

  806.     DrawTextContext *s = ctx->priv;

  807. 

  808.     av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));

  809.     return 0;

  810. }

  811. 

  812. static int func_pts(AVFilterContext *ctx, AVBPrint *bp,

  813.                     char *fct, unsigned argc, char **argv, int tag)

  814. {

  815.     DrawTextContext *s = ctx->priv;

  816.     const char *fmt;

  817.     double pts = s->var_values[VAR_T];

  818.     int ret;

  819. 

  820.     fmt = argc >= 1 ? argv[0] : "flt";

  821.     if (argc >= 2) {

  822.         int64_t delta;

  823.         if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {

  824.             av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);

  825.             return ret;

  826.         }

  827.         pts += (double)delta / AV_TIME_BASE;

  828.     }

  829.     if (!strcmp(fmt, "flt")) {

  830.         av_bprintf(bp, "%.6f", s->var_values[VAR_T]);

  831.     } else if (!strcmp(fmt, "hms")) {

  832.         if (isnan(pts)) {

  833.             av_bprintf(bp, " ??:??:??.???");

  834.         } else {

  835.             int64_t ms = round(pts * 1000);

  836.             char sign = ' ';

  837.             if (ms < 0) {

  838.                 sign = '-';

  839.                 ms = -ms;

  840.             }

  841.             av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,

  842.                        (int)(ms / (60 * 60 * 1000)),

  843.                        (int)(ms / (60 * 1000)) % 60,

  844.                        (int)(ms / 1000) % 60,

  845.                        (int)ms % 1000);

  846.         }

  847.     } else {

  848.         av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);

  849.         return AVERROR(EINVAL);

  850.     }

  851.     return 0;

  852. }

  853. 

  854. static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,

  855.                           char *fct, unsigned argc, char **argv, int tag)

  856. {

  857.     DrawTextContext *s = ctx->priv;

  858. 

  859.     av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);

  860.     return 0;

  861. }

  862. 

  863. static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,

  864.                          char *fct, unsigned argc, char **argv, int tag)

  865. {

  866.     DrawTextContext *s = ctx->priv;

  867.     AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);

  868. 

  869.     if (e && e->value)

  870.         av_bprintf(bp, "%s", e->value);

  871.     return 0;

  872. }

  873. 

  874. #if !HAVE_LOCALTIME_R

  875. static void localtime_r(const time_t *t, struct tm *tm)

  876. {

  877.     *tm = *localtime(t);

  878. }

  879. #endif

  880. 

  881. static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,

  882.                          char *fct, unsigned argc, char **argv, int tag)

  883. {

  884.     const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";

  885.     time_t now;

  886.     struct tm tm;

  887. 

  888.     time(&now);

  889.     if (tag == 'L')

  890.         localtime_r(&now, &tm);

  891.     else

  892.         tm = *gmtime(&now);

  893.     av_bprint_strftime(bp, fmt, &tm);

  894.     return 0;

  895. }

  896. 

  897. static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,

  898.                           char *fct, unsigned argc, char **argv, int tag)

  899. {

  900.     DrawTextContext *s = ctx->priv;

  901.     double res;

  902.     int ret;

  903. 

  904.     ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,

  905.                                  NULL, NULL, fun2_names, fun2,

  906.                                  &s->prng, 0, ctx);

  907.     if (ret < 0)

  908.         av_log(ctx, AV_LOG_ERROR,

  909.                "Expression '%s' for the expr text expansion function is not valid\n",

  910.                argv[0]);

  911.     else

  912.         av_bprintf(bp, "%f", res);

  913. 

  914.     return ret;

  915. }

  916. 

  917. static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,

  918.                           char *fct, unsigned argc, char **argv, int tag)

  919. {

  920.     DrawTextContext *s = ctx->priv;

  921.     double res;

  922.     int intval;

  923.     int ret;

  924.     unsigned int positions = 0;

  925.     char fmt_str[30] = "%";

  926. 

  927.     /*

  928.      * argv[0] expression to be converted to `int`

  929.      * argv[1] format: 'x', 'X', 'd' or 'u'

  930.      * argv[2] positions printed (optional)

  931.      */

  932. 

  933.     ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,

  934.                                  NULL, NULL, fun2_names, fun2,

  935.                                  &s->prng, 0, ctx);

  936.     if (ret < 0) {

  937.         av_log(ctx, AV_LOG_ERROR,

  938.                "Expression '%s' for the expr text expansion function is not valid\n",

  939.                argv[0]);

  940.         return ret;

  941.     }

  942. 

  943.     if (!strchr("xXdu", argv[1][0])) {

  944.         av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"

  945.                 " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);

  946.         return AVERROR(EINVAL);

  947.     }

  948. 

  949.     if (argc == 3) {

  950.         ret = sscanf(argv[2], "%u", &positions);

  951.         if (ret != 1) {

  952.             av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"

  953.                     " to print: '%s'\n", argv[2]);

  954.             return AVERROR(EINVAL);

  955.         }

  956.     }

  957. 

  958.     feclearexcept(FE_ALL_EXCEPT);

  959.     intval = res;

  960.     if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {

  961.         av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);

  962.         return AVERROR(EINVAL);

  963.     }

  964. 

  965.     if (argc == 3)

  966.         av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);

  967.     av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);

  968. 

  969.     av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",

  970.             res, argv[0], fmt_str);

  971. 

  972.     av_bprintf(bp, fmt_str, intval);

  973. 

  974.     return 0;

  975. }

  976. 

  977. static const struct drawtext_function {

  978.     const char *name;

  979.     unsigned argc_min, argc_max;

  980.     int tag;                            /**< opaque argument to func */

  981.     int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);

  982. } functions[] = {

  983.     { "expr",      1, 1, 0,   func_eval_expr },

  984.     { "e",         1, 1, 0,   func_eval_expr },

  985.     { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },

  986.     { "eif",       2, 3, 0,   func_eval_expr_int_format },

  987.     { "pict_type", 0, 0, 0,   func_pict_type },

  988.     { "pts",       0, 2, 0,   func_pts      },

  989.     { "gmtime",    0, 1, 'G', func_strftime },

  990.     { "localtime", 0, 1, 'L', func_strftime },

  991.     { "frame_num", 0, 0, 0,   func_frame_num },

  992.     { "n",         0, 0, 0,   func_frame_num },

  993.     { "metadata",  1, 1, 0,   func_metadata },

  994. };

  995. 

  996. static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,

  997.                          unsigned argc, char **argv)

  998. {

  999.     unsigned i;

  1000. 

  1001.     for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {

  1002.         if (strcmp(fct, functions[i].name))

  1003.             continue;

  1004.         if (argc < functions[i].argc_min) {

  1005.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",

  1006.                    fct, functions[i].argc_min);

  1007.             return AVERROR(EINVAL);

  1008.         }

  1009.         if (argc > functions[i].argc_max) {

  1010.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",

  1011.                    fct, functions[i].argc_max);

  1012.             return AVERROR(EINVAL);

  1013.         }

  1014.         break;

  1015.     }

  1016.     if (i >= FF_ARRAY_ELEMS(functions)) {

  1017.         av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);

  1018.         return AVERROR(EINVAL);

  1019.     }

  1020.     return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);

  1021. }

  1022. 

  1023. static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)

  1024. {

  1025.     const char *text = *rtext;

  1026.     char *argv[16] = { NULL };

  1027.     unsigned argc = 0, i;

  1028.     int ret;

  1029. 

  1030.     if (*text != '{') {

  1031.         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);

  1032.         return AVERROR(EINVAL);

  1033.     }

  1034.     text++;

  1035.     while (1) {

  1036.         if (!(argv[argc++] = av_get_token(&text, ":}"))) {

  1037.             ret = AVERROR(ENOMEM);

  1038.             goto end;

  1039.         }

  1040.         if (!*text) {

  1041.             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);

  1042.             ret = AVERROR(EINVAL);

  1043.             goto end;

  1044.         }

  1045.         if (argc == FF_ARRAY_ELEMS(argv))

  1046.             av_freep(&argv[--argc]); /* error will be caught later */

  1047.         if (*text == '}')

  1048.             break;

  1049.         text++;

  1050.     }

  1051. 

  1052.     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)

  1053.         goto end;

  1054.     ret = 0;

  1055.     *rtext = (char *)text + 1;

  1056. 

  1057. end:

  1058.     for (i = 0; i < argc; i++)

  1059.         av_freep(&argv[i]);

  1060.     return ret;

  1061. }

  1062. 

  1063. static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)

  1064. {

  1065.     int ret;

  1066. 

  1067.     av_bprint_clear(bp);

  1068.     while (*text) {

  1069.         if (*text == '\\' && text[1]) {

  1070.             av_bprint_chars(bp, text[1], 1);

  1071.             text += 2;

  1072.         } else if (*text == '%') {

  1073.             text++;

  1074.             if ((ret = expand_function(ctx, bp, &text)) < 0)

  1075.                 return ret;

  1076.         } else {

  1077.             av_bprint_chars(bp, *text, 1);

  1078.             text++;

  1079.         }

  1080.     }

  1081.     if (!av_bprint_is_complete(bp))

  1082.         return AVERROR(ENOMEM);

  1083.     return 0;

  1084. }

  1085. 

  1086. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  1087.                        int width, int height,

  1088.                        FFDrawColor *color, int x, int y, int borderw)

  1089. {

  1090.     char *text = s->expanded_text.str;

  1091.     uint32_t code = 0;

  1092.     int i, x1, y1;

  1093.     uint8_t *p;

  1094.     Glyph *glyph = NULL;

  1095. 

  1096.     for (i = 0, p = text; *p; i++) {

  1097.         FT_Bitmap bitmap;

  1098.         Glyph dummy = { 0 };

  1099.         GET_UTF8(code, *p++, continue;);

  1100. 

  1101.         /* skip new line chars, just go to new line */

  1102.         if (code == '\n' || code == '\r' || code == '\t')

  1103.             continue;

  1104. 

  1105.         dummy.code = code;

  1106.         glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);

  1107. 

  1108.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  1109. 

  1110.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  1111.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  1112.             return AVERROR(EINVAL);

  1113. 

  1114.         x1 = s->positions[i].x+s->x+x - borderw;

  1115.         y1 = s->positions[i].y+s->y+y - borderw;

  1116. 

  1117.         ff_blend_mask(&s->dc, color,

  1118.                       frame->data, frame->linesize, width, height,

  1119.                       bitmap.buffer, bitmap.pitch,

  1120.                       bitmap.width, bitmap.rows,

  1121.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  1122.                       0, x1, y1);

  1123.     }

  1124. 

  1125.     return 0;

  1126. }

  1127. 

  1128. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  1129.                      int width, int height)

  1130. {

  1131.     DrawTextContext *s = ctx->priv;

  1132.     AVFilterLink *inlink = ctx->inputs[0];

  1133. 

  1134.     uint32_t code = 0, prev_code = 0;

  1135.     int x = 0, y = 0, i = 0, ret;

  1136.     int max_text_line_w = 0, len;

  1137.     int box_w, box_h;

  1138.     char *text;

  1139.     uint8_t *p;

  1140.     int y_min = 32000, y_max = -32000;

  1141.     int x_min = 32000, x_max = -32000;

  1142.     FT_Vector delta;

  1143.     Glyph *glyph = NULL, *prev_glyph = NULL;

  1144.     Glyph dummy = { 0 };

  1145. 

  1146.     time_t now = time(0);

  1147.     struct tm ltime;

  1148.     AVBPrint *bp = &s->expanded_text;

  1149. 

  1150.     av_bprint_clear(bp);

  1151. 

  1152.     if(s->basetime != AV_NOPTS_VALUE)

  1153.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;

  1154. 

  1155.     switch (s->exp_mode) {

  1156.     case EXP_NONE:

  1157.         av_bprintf(bp, "%s", s->text);

  1158.         break;

  1159.     case EXP_NORMAL:

  1160.         if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)

  1161.             return ret;

  1162.         break;

  1163.     case EXP_STRFTIME:

  1164.         localtime_r(&now, &ltime);

  1165.         av_bprint_strftime(bp, s->text, &ltime);

  1166.         break;

  1167.     }

  1168. 

  1169.     if (s->tc_opt_string) {

  1170.         char tcbuf[AV_TIMECODE_STR_SIZE];

  1171.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);

  1172.         av_bprint_clear(bp);

  1173.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1174.     }

  1175. 

  1176.     if (!av_bprint_is_complete(bp))

  1177.         return AVERROR(ENOMEM);

  1178.     text = s->expanded_text.str;

  1179.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1180.         if (!(s->positions =

  1181.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1182.             return AVERROR(ENOMEM);

  1183.         s->nb_positions = len;

  1184.     }

  1185. 

  1186.     if (s->fontcolor_expr[0]) {

  1187.         /* If expression is set, evaluate and replace the static value */

  1188.         av_bprint_clear(&s->expanded_fontcolor);

  1189.         if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)

  1190.             return ret;

  1191.         if (!av_bprint_is_complete(&s->expanded_fontcolor))

  1192.             return AVERROR(ENOMEM);

  1193.         av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);

  1194.         ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);

  1195.         if (ret)

  1196.             return ret;

  1197.         ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);

  1198.     }

  1199. 

  1200.     x = 0;

  1201.     y = 0;

  1202. 

  1203.     /* load and cache glyphs */

  1204.     for (i = 0, p = text; *p; i++) {

  1205.         GET_UTF8(code, *p++, continue;);

  1206. 

  1207.         /* get glyph */

  1208.         dummy.code = code;

  1209.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1210.         if (!glyph) {

  1211.             load_glyph(ctx, &glyph, code);

  1212.         }

  1213. 

  1214.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1215.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1216.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1217.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1218.     }

  1219.     s->max_glyph_h = y_max - y_min;

  1220.     s->max_glyph_w = x_max - x_min;

  1221. 

  1222.     /* compute and save position for each glyph */

  1223.     glyph = NULL;

  1224.     for (i = 0, p = text; *p; i++) {

  1225.         GET_UTF8(code, *p++, continue;);

  1226. 

  1227.         /* skip the \n in the sequence \r\n */

  1228.         if (prev_code == '\r' && code == '\n')

  1229.             continue;

  1230. 

  1231.         prev_code = code;

  1232.         if (is_newline(code)) {

  1233. 

  1234.             max_text_line_w = FFMAX(max_text_line_w, x);

  1235.             y += s->max_glyph_h;

  1236.             x = 0;

  1237.             continue;

  1238.         }

  1239. 

  1240.         /* get glyph */

  1241.         prev_glyph = glyph;

  1242.         dummy.code = code;

  1243.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1244. 

  1245.         /* kerning */

  1246.         if (s->use_kerning && prev_glyph && glyph->code) {

  1247.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1248.                            ft_kerning_default, &delta);

  1249.             x += delta.x >> 6;

  1250.         }

  1251. 

  1252.         /* save position */

  1253.         s->positions[i].x = x + glyph->bitmap_left;

  1254.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1255.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1256.         else              x += glyph->advance;

  1257.     }

  1258. 

  1259.     max_text_line_w = FFMAX(x, max_text_line_w);

  1260. 

  1261.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1262.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1263. 

  1264.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1265.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1266.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1267.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1268. 

  1269.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1270. 

  1271.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1272.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1273.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1274. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1275.     if (s->draw_pexpr){

  1276.     s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);

  1277. 

  1278.     if(!s->draw)

  1279.         return 0;

  1280.     }

  1281.     if (ctx->is_disabled)

  1282.         return 0;

  1283. #endif

  1284. 

  1285.     box_w = FFMIN(width - 1 , max_text_line_w);

  1286.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1287. 

  1288.     /* draw box */

  1289.     if (s->draw_box)

  1290.         ff_blend_rectangle(&s->dc, &s->boxcolor,

  1291.                            frame->data, frame->linesize, width, height,

  1292.                            s->x, s->y, box_w, box_h);

  1293. 

  1294.     if (s->shadowx || s->shadowy) {

  1295.         if ((ret = draw_glyphs(s, frame, width, height,

  1296.                                &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1297.             return ret;

  1298.     }

  1299. 

  1300.     if (s->borderw) {

  1301.         if ((ret = draw_glyphs(s, frame, width, height,

  1302.                                &s->bordercolor, 0, 0, s->borderw)) < 0)

  1303.             return ret;

  1304.     }

  1305.     if ((ret = draw_glyphs(s, frame, width, height,

  1306.                            &s->fontcolor, 0, 0, 0)) < 0)

  1307.         return ret;

  1308. 

  1309.     return 0;

  1310. }

  1311. 

  1312. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1313. {

  1314.     AVFilterContext *ctx = inlink->dst;

  1315.     AVFilterLink *outlink = ctx->outputs[0];

  1316.     DrawTextContext *s = ctx->priv;

  1317.     int ret;

  1318. 

  1319.     if (s->reload) {

  1320.         if ((ret = load_textfile(ctx)) < 0)

  1321.             return ret;

  1322. #if CONFIG_LIBFRIBIDI

  1323.         if (s->text_shaping)

  1324.             if ((ret = shape_text(ctx)) < 0)

  1325.                 return ret;

  1326. #endif

  1327.     }

  1328. 

  1329.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;

  1330.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1331.         NAN : frame->pts * av_q2d(inlink->time_base);

  1332. 

  1333.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1334.     s->metadata = av_frame_get_metadata(frame);

  1335. 

  1336.     draw_text(ctx, frame, frame->width, frame->height);

  1337. 

  1338.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1339.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1340.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1341.            s->x, s->y);

  1342. 

  1343.     return ff_filter_frame(outlink, frame);

  1344. }

  1345. 

  1346. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1347.     {

  1348.         .name           = "default",

  1349.         .type           = AVMEDIA_TYPE_VIDEO,

  1350.         .filter_frame   = filter_frame,

  1351.         .config_props   = config_input,

  1352.         .needs_writable = 1,

  1353.     },

  1354.     { NULL }

  1355. };

  1356. 

  1357. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1358.     {

  1359.         .name = "default",

  1360.         .type = AVMEDIA_TYPE_VIDEO,

  1361.     },

  1362.     { NULL }

  1363. };

  1364. 

  1365. AVFilter ff_vf_drawtext = {

  1366.     .name          = "drawtext",

  1367.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1368.     .priv_size     = sizeof(DrawTextContext),

  1369.     .priv_class    = &drawtext_class,

  1370.     .init          = init,

  1371.     .uninit        = uninit,

  1372.     .query_formats = query_formats,

  1373.     .inputs        = avfilter_vf_drawtext_inputs,

  1374.     .outputs       = avfilter_vf_drawtext_outputs,

  1375.     .process_command = command,

  1376. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1377.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

  1378. #else

  1379.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1380. #endif

  1381. };