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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/time_internal.h"

  56. #include "libavutil/tree.h"

  57. #include "libavutil/lfg.h"

  58. #include "avfilter.h"

  59. #include "drawutils.h"

  60. #include "formats.h"

  61. #include "internal.h"

  62. #include "video.h"

  63. 

  64. #if CONFIG_LIBFRIBIDI

  65. #include <fribidi.h>

  66. #endif

  67. 

  68. #include <ft2build.h>

  69. #include FT_FREETYPE_H

  70. #include FT_GLYPH_H

  71. #include FT_STROKER_H

  72. 

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

  74.     "dar",

  75.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  84.     "sar",

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

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

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

  88.     "x",

  89.     "y",

  90.     "pict_type",

  91.     NULL

  92. };

  93. 

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

  95.     "rand"

  96. };

  97. 

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

  99. {

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

  101. }

  102. 

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

  104. 

  105. static const eval_func2 fun2[] = {

  106.     drand,

  107.     NULL

  108. };

  109. 

  110. enum var_name {

  111.     VAR_DAR,

  112.     VAR_HSUB, VAR_VSUB,

  113.     VAR_LINE_H, VAR_LH,

  114.     VAR_MAIN_H, VAR_h, VAR_H,

  115.     VAR_MAIN_W, VAR_w, VAR_W,

  116.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  117.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  118.     VAR_MAX_GLYPH_H,

  119.     VAR_MAX_GLYPH_W,

  120.     VAR_N,

  121.     VAR_SAR,

  122.     VAR_T,

  123.     VAR_TEXT_H, VAR_TH,

  124.     VAR_TEXT_W, VAR_TW,

  125.     VAR_X,

  126.     VAR_Y,

  127.     VAR_PICT_TYPE,

  128.     VAR_VARS_NB

  129. };

  130. 

  131. enum expansion_mode {

  132.     EXP_NONE,

  133.     EXP_NORMAL,

  134.     EXP_STRFTIME,

  135. };

  136. 

  137. typedef struct DrawTextContext {

  138.     const AVClass *class;

  139.     int exp_mode;                   ///< expansion mode to use for the text

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

  141. #if CONFIG_LIBFONTCONFIG

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

  143. #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

  157.     int shadowx, shadowy;

  158.     int borderw;                    ///< border width

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

  160. 

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

  162.     int boxborderw;                 ///< box border width

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

  164.     int tabsize;                    ///< tab size

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

  166. 

  167.     FFDrawContext dc;

  168.     FFDrawColor fontcolor;          ///< foreground color

  169.     FFDrawColor shadowcolor;        ///< shadow color

  170.     FFDrawColor bordercolor;        ///< border color

  171.     FFDrawColor boxcolor;           ///< background color

  172. 

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

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

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

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

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

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

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

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

  181.     double var_values[VAR_VARS_NB];

  182.     char   *a_expr;

  183.     AVExpr *a_pexpr;

  184.     int alpha;

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

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

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

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

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

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

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

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

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

  220. #if CONFIG_LIBFONTCONFIG

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

  222. #endif

  223. 

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

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

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

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

  228. 

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

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

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

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

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

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

  235.     { "alpha",       "apply alpha while rendering", OFFSET(a_expr),      AV_OPT_TYPE_STRING, { .str = "1"     },          .flags = FLAGS },

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

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

  238. 

  239. #if CONFIG_LIBFRIBIDI

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

  241. #endif

  242. 

  243.     /* FT_LOAD_* flags */

  244.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  260.     { NULL }

  261. };

  262. 

  263. AVFILTER_DEFINE_CLASS(drawtext);

  264. 

  265. #undef __FTERRORS_H__

  266. #define FT_ERROR_START_LIST {

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

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

  269. 

  270. static const struct ft_error

  271. {

  272.     int err;

  273.     const char *err_msg;

  274. } ft_errors[] =

  275. #include FT_ERRORS_H

  276. 

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

  278. 

  279. typedef struct Glyph {

  280.     FT_Glyph glyph;

  281.     FT_Glyph border_glyph;

  282.     uint32_t code;

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

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

  285.     FT_BBox bbox;

  286.     int advance;

  287.     int bitmap_left;

  288.     int bitmap_top;

  289. } Glyph;

  290. 

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

  292. {

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

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

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

  296. }

  297. 

  298. /**

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

  300.  */

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

  302. {

  303.     DrawTextContext *s = ctx->priv;

  304.     FT_BitmapGlyph bitmapglyph;

  305.     Glyph *glyph;

  306.     struct AVTreeNode *node = NULL;

  307.     int ret;

  308. 

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

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

  311.         return AVERROR(EINVAL);

  312. 

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

  314.     if (!glyph) {

  315.         ret = AVERROR(ENOMEM);

  316.         goto error;

  317.     }

  318.     glyph->code  = code;

  319. 

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

  321.         ret = AVERROR(EINVAL);

  322.         goto error;

  323.     }

  324.     if (s->borderw) {

  325.         glyph->border_glyph = glyph->glyph;

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

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

  328.             ret = AVERROR_EXTERNAL;

  329.             goto error;

  330.         }

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

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

  333.     }

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

  335.         ret = AVERROR_EXTERNAL;

  336.         goto error;

  337.     }

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

  339. 

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

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

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

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

  344. 

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

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

  347. 

  348.     /* cache the newly created glyph */

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

  350.         ret = AVERROR(ENOMEM);

  351.         goto error;

  352.     }

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

  354. 

  355.     if (glyph_ptr)

  356.         *glyph_ptr = glyph;

  357.     return 0;

  358. 

  359. error:

  360.     if (glyph)

  361.         av_freep(&glyph->glyph);

  362. 

  363.     av_freep(&glyph);

  364.     av_freep(&node);

  365.     return ret;

  366. }

  367. 

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

  369. {

  370.     DrawTextContext *s = ctx->priv;

  371.     int err;

  372. 

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

  374.     if (err) {

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

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

  377.         return AVERROR(EINVAL);

  378.     }

  379.     return 0;

  380. }

  381. 

  382. #if CONFIG_LIBFONTCONFIG

  383. static int load_font_fontconfig(AVFilterContext *ctx)

  384. {

  385.     DrawTextContext *s = ctx->priv;

  386.     FcConfig *fontconfig;

  387.     FcPattern *pat, *best;

  388.     FcResult result = FcResultMatch;

  389.     FcChar8 *filename;

  390.     int index;

  391.     double size;

  392.     int err = AVERROR(ENOENT);

  393. 

  394.     fontconfig = FcInitLoadConfigAndFonts();

  395.     if (!fontconfig) {

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

  397.         return AVERROR_UNKNOWN;

  398.     }

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

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

  401.     if (!pat) {

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

  403.         return AVERROR(EINVAL);

  404.     }

  405. 

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

  407.     if (s->fontsize)

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

  409. 

  410.     FcDefaultSubstitute(pat);

  411. 

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

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

  414.         FcPatternDestroy(pat);

  415.         return AVERROR(ENOMEM);

  416.     }

  417. 

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

  419.     FcPatternDestroy(pat);

  420. 

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

  422.         av_log(ctx, AV_LOG_ERROR,

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

  424.                s->font);

  425.         goto fail;

  426.     }

  427. 

  428.     if (

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

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

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

  432.         return AVERROR(EINVAL);

  433.     }

  434. 

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

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

  437.                s->font);

  438.         goto fail;

  439.     }

  440. 

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

  442.     if (!s->fontsize)

  443.         s->fontsize = size + 0.5;

  444. 

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

  446.     if (err)

  447.         return err;

  448.     FcConfigDestroy(fontconfig);

  449. fail:

  450.     FcPatternDestroy(best);

  451.     return err;

  452. }

  453. #endif

  454. 

  455. static int load_font(AVFilterContext *ctx)

  456. {

  457.     DrawTextContext *s = ctx->priv;

  458.     int err;

  459. 

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

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

  462.     if (!err)

  463.         return 0;

  464. #if CONFIG_LIBFONTCONFIG

  465.     err = load_font_fontconfig(ctx);

  466.     if (!err)

  467.         return 0;

  468. #endif

  469.     return err;

  470. }

  471. 

  472. static int load_textfile(AVFilterContext *ctx)

  473. {

  474.     DrawTextContext *s = ctx->priv;

  475.     int err;

  476.     uint8_t *textbuf;

  477.     uint8_t *tmp;

  478.     size_t textbuf_size;

  479. 

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

  481.         av_log(ctx, AV_LOG_ERROR,

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

  483.                s->textfile);

  484.         return err;

  485.     }

  486. 

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

  488.         av_file_unmap(textbuf, textbuf_size);

  489.         return AVERROR(ENOMEM);

  490.     }

  491.     s->text = tmp;

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

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

  494.     av_file_unmap(textbuf, textbuf_size);

  495. 

  496.     return 0;

  497. }

  498. 

  499. static inline int is_newline(uint32_t c)

  500. {

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

  502. }

  503. 

  504. #if CONFIG_LIBFRIBIDI

  505. static int shape_text(AVFilterContext *ctx)

  506. {

  507.     DrawTextContext *s = ctx->priv;

  508.     uint8_t *tmp;

  509.     int ret = AVERROR(ENOMEM);

  510.     static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |

  511.                                       FRIBIDI_FLAGS_ARABIC;

  512.     FriBidiChar *unicodestr = NULL;

  513.     FriBidiStrIndex len;

  514.     FriBidiParType direction = FRIBIDI_PAR_LTR;

  515.     FriBidiStrIndex line_start = 0;

  516.     FriBidiStrIndex line_end = 0;

  517.     FriBidiLevel *embedding_levels = NULL;

  518.     FriBidiArabicProp *ar_props = NULL;

  519.     FriBidiCharType *bidi_types = NULL;

  520.     FriBidiStrIndex i,j;

  521. 

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

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

  524.         goto out;

  525.     }

  526.     len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,

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

  528. 

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

  530.     if (!bidi_types) {

  531.         goto out;

  532.     }

  533. 

  534.     fribidi_get_bidi_types(unicodestr, len, bidi_types);

  535. 

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

  537.     if (!embedding_levels) {

  538.         goto out;

  539.     }

  540. 

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

  542.                                           embedding_levels)) {

  543.         goto out;

  544.     }

  545. 

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

  547.     if (!ar_props) {

  548.         goto out;

  549.     }

  550. 

  551.     fribidi_get_joining_types(unicodestr, len, ar_props);

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

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

  554. 

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

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

  557.             if (!fribidi_reorder_line(flags, bidi_types,

  558.                                       line_end - line_start + 1, line_start,

  559.                                       direction, embedding_levels, unicodestr,

  560.                                       NULL)) {

  561.                 goto out;

  562.             }

  563.             line_start = line_end + 1;

  564.         }

  565.     }

  566. 

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

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

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

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

  571.     len = j;

  572. 

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

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

  575.         goto out;

  576.     }

  577. 

  578.     s->text = tmp;

  579.     len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,

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

  581.     ret = 0;

  582. 

  583. out:

  584.     av_free(unicodestr);

  585.     av_free(embedding_levels);

  586.     av_free(ar_props);

  587.     av_free(bidi_types);

  588.     return ret;

  589. }

  590. #endif

  591. 

  592. static av_cold int init(AVFilterContext *ctx)

  593. {

  594.     int err;

  595.     DrawTextContext *s = ctx->priv;

  596.     Glyph *glyph;

  597. 

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

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

  600.         return AVERROR(EINVAL);

  601.     }

  602. 

  603.     if (s->textfile) {

  604.         if (s->text) {

  605.             av_log(ctx, AV_LOG_ERROR,

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

  607.             return AVERROR(EINVAL);

  608.         }

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

  610.             return err;

  611.     }

  612. 

  613. #if CONFIG_LIBFRIBIDI

  614.     if (s->text_shaping)

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

  616.             return err;

  617. #endif

  618. 

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

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

  621. 

  622.     if (s->tc_opt_string) {

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

  624.                                                s->tc_opt_string, ctx);

  625.         if (ret < 0)

  626.             return ret;

  627.         if (s->tc24hmax)

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

  629.         if (!s->text)

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

  631.     }

  632. 

  633.     if (!s->text) {

  634.         av_log(ctx, AV_LOG_ERROR,

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

  636.         return AVERROR(EINVAL);

  637.     }

  638. 

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

  640.         av_log(ctx, AV_LOG_ERROR,

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

  642.         return AVERROR(EINVAL);

  643.     }

  644. 

  645.     err = load_font(ctx);

  646.     if (err)

  647.         return err;

  648.     if (!s->fontsize)

  649.         s->fontsize = 16;

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

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

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

  653.         return AVERROR(EINVAL);

  654.     }

  655. 

  656.     if (s->borderw) {

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

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

  659.             return AVERROR_EXTERNAL;

  660.         }

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

  662.                        FT_STROKER_LINEJOIN_ROUND, 0);

  663.     }

  664. 

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

  666. 

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

  668.     load_glyph(ctx, NULL, 0);

  669. 

  670.     /* set the tabsize in pixels */

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

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

  673.         return err;

  674.     }

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

  676. 

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

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

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

  680. 

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

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

  683. 

  684.     return 0;

  685. }

  686. 

  687. static int query_formats(AVFilterContext *ctx)

  688. {

  689.     return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));

  690. }

  691. 

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

  693. {

  694.     Glyph *glyph = elem;

  695. 

  696.     FT_Done_Glyph(glyph->glyph);

  697.     FT_Done_Glyph(glyph->border_glyph);

  698.     av_free(elem);

  699.     return 0;

  700. }

  701. 

  702. static av_cold void uninit(AVFilterContext *ctx)

  703. {

  704.     DrawTextContext *s = ctx->priv;

  705. 

  706.     av_expr_free(s->x_pexpr);

  707.     av_expr_free(s->y_pexpr);

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

  709.     av_freep(&s->positions);

  710.     s->nb_positions = 0;

  711. 

  712. 

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

  714.     av_tree_destroy(s->glyphs);

  715.     s->glyphs = NULL;

  716. 

  717.     FT_Done_Face(s->face);

  718.     FT_Stroker_Done(s->stroker);

  719.     FT_Done_FreeType(s->library);

  720. 

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

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

  723. }

  724. 

  725. static int config_input(AVFilterLink *inlink)

  726. {

  727.     AVFilterContext *ctx = inlink->dst;

  728.     DrawTextContext *s = ctx->priv;

  729.     int ret;

  730. 

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

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

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

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

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

  736. 

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

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

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

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

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

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

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

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

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

  746. 

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

  748. 

  749.     av_expr_free(s->x_pexpr);

  750.     av_expr_free(s->y_pexpr);

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

  752. 

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

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

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

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

  757.         (ret = av_expr_parse(&s->a_pexpr, s->a_expr, var_names,

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

  759. 

  760.         return AVERROR(EINVAL);

  761. 

  762.     return 0;

  763. }

  764. 

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

  766. {

  767.     DrawTextContext *s = ctx->priv;

  768. 

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

  770.         int ret;

  771.         uninit(ctx);

  772.         s->reinit = 1;

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

  774.             return ret;

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

  776.             return ret;

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

  778.     }

  779. 

  780.     return AVERROR(ENOSYS);

  781. }

  782. 

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

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

  785. {

  786.     DrawTextContext *s = ctx->priv;

  787. 

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

  789.     return 0;

  790. }

  791. 

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

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

  794. {

  795.     DrawTextContext *s = ctx->priv;

  796.     const char *fmt;

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

  798.     int ret;

  799. 

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

  801.     if (argc >= 2) {

  802.         int64_t delta;

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

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

  805.             return ret;

  806.         }

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

  808.     }

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

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

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

  812.         if (isnan(pts)) {

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

  814.         } else {

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

  816.             char sign = ' ';

  817.             if (ms < 0) {

  818.                 sign = '-';

  819.                 ms = -ms;

  820.             }

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

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

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

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

  825.                        (int)ms % 1000);

  826.         }

  827.     } else {

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

  829.         return AVERROR(EINVAL);

  830.     }

  831.     return 0;

  832. }

  833. 

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

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

  836. {

  837.     DrawTextContext *s = ctx->priv;

  838. 

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

  840.     return 0;

  841. }

  842. 

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

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

  845. {

  846.     DrawTextContext *s = ctx->priv;

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

  848. 

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

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

  851.     return 0;

  852. }

  853. 

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

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

  856. {

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

  858.     time_t now;

  859.     struct tm tm;

  860. 

  861.     time(&now);

  862.     if (tag == 'L')

  863.         localtime_r(&now, &tm);

  864.     else

  865.         tm = *gmtime_r(&now, &tm);

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

  867.     return 0;

  868. }

  869. 

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

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

  872. {

  873.     DrawTextContext *s = ctx->priv;

  874.     double res;

  875.     int ret;

  876. 

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

  878.                                  NULL, NULL, fun2_names, fun2,

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

  880.     if (ret < 0)

  881.         av_log(ctx, AV_LOG_ERROR,

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

  883.                argv[0]);

  884.     else

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

  886. 

  887.     return ret;

  888. }

  889. 

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

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

  892. {

  893.     DrawTextContext *s = ctx->priv;

  894.     double res;

  895.     int intval;

  896.     int ret;

  897.     unsigned int positions = 0;

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

  899. 

  900.     /*

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

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

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

  904.      */

  905. 

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

  907.                                  NULL, NULL, fun2_names, fun2,

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

  909.     if (ret < 0) {

  910.         av_log(ctx, AV_LOG_ERROR,

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

  912.                argv[0]);

  913.         return ret;

  914.     }

  915. 

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

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

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

  919.         return AVERROR(EINVAL);

  920.     }

  921. 

  922.     if (argc == 3) {

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

  924.         if (ret != 1) {

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

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

  927.             return AVERROR(EINVAL);

  928.         }

  929.     }

  930. 

  931.     feclearexcept(FE_ALL_EXCEPT);

  932.     intval = res;

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

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

  935.         return AVERROR(EINVAL);

  936.     }

  937. 

  938.     if (argc == 3)

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

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

  941. 

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

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

  944. 

  945.     av_bprintf(bp, fmt_str, intval);

  946. 

  947.     return 0;

  948. }

  949. 

  950. static const struct drawtext_function {

  951.     const char *name;

  952.     unsigned argc_min, argc_max;

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

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

  955. } functions[] = {

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

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

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

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

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

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

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

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

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

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

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

  967. };

  968. 

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

  970.                          unsigned argc, char **argv)

  971. {

  972.     unsigned i;

  973. 

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

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

  976.             continue;

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

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

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

  980.             return AVERROR(EINVAL);

  981.         }

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

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

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

  985.             return AVERROR(EINVAL);

  986.         }

  987.         break;

  988.     }

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

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

  991.         return AVERROR(EINVAL);

  992.     }

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

  994. }

  995. 

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

  997. {

  998.     const char *text = *rtext;

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

  1000.     unsigned argc = 0, i;

  1001.     int ret;

  1002. 

  1003.     if (*text != '{') {

  1004.         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);

  1005.         return AVERROR(EINVAL);

  1006.     }

  1007.     text++;

  1008.     while (1) {

  1009.         if (!(argv[argc++] = av_get_token(&text, ":}"))) {

  1010.             ret = AVERROR(ENOMEM);

  1011.             goto end;

  1012.         }

  1013.         if (!*text) {

  1014.             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);

  1015.             ret = AVERROR(EINVAL);

  1016.             goto end;

  1017.         }

  1018.         if (argc == FF_ARRAY_ELEMS(argv))

  1019.             av_freep(&argv[--argc]); /* error will be caught later */

  1020.         if (*text == '}')

  1021.             break;

  1022.         text++;

  1023.     }

  1024. 

  1025.     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)

  1026.         goto end;

  1027.     ret = 0;

  1028.     *rtext = (char *)text + 1;

  1029. 

  1030. end:

  1031.     for (i = 0; i < argc; i++)

  1032.         av_freep(&argv[i]);

  1033.     return ret;

  1034. }

  1035. 

  1036. static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)

  1037. {

  1038.     int ret;

  1039. 

  1040.     av_bprint_clear(bp);

  1041.     while (*text) {

  1042.         if (*text == '\\' && text[1]) {

  1043.             av_bprint_chars(bp, text[1], 1);

  1044.             text += 2;

  1045.         } else if (*text == '%') {

  1046.             text++;

  1047.             if ((ret = expand_function(ctx, bp, &text)) < 0)

  1048.                 return ret;

  1049.         } else {

  1050.             av_bprint_chars(bp, *text, 1);

  1051.             text++;

  1052.         }

  1053.     }

  1054.     if (!av_bprint_is_complete(bp))

  1055.         return AVERROR(ENOMEM);

  1056.     return 0;

  1057. }

  1058. 

  1059. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  1060.                        int width, int height,

  1061.                        FFDrawColor *color,

  1062.                        int x, int y, int borderw)

  1063. {

  1064.     char *text = s->expanded_text.str;

  1065.     uint32_t code = 0;

  1066.     int i, x1, y1;

  1067.     uint8_t *p;

  1068.     Glyph *glyph = NULL;

  1069. 

  1070.     for (i = 0, p = text; *p; i++) {

  1071.         FT_Bitmap bitmap;

  1072.         Glyph dummy = { 0 };

  1073.         GET_UTF8(code, *p++, continue;);

  1074. 

  1075.         /* skip new line chars, just go to new line */

  1076.         if (code == '\n' || code == '\r' || code == '\t')

  1077.             continue;

  1078. 

  1079.         dummy.code = code;

  1080.         glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);

  1081. 

  1082.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  1083. 

  1084.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  1085.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  1086.             return AVERROR(EINVAL);

  1087. 

  1088.         x1 = s->positions[i].x+s->x+x - borderw;

  1089.         y1 = s->positions[i].y+s->y+y - borderw;

  1090. 

  1091.         ff_blend_mask(&s->dc, color,

  1092.                       frame->data, frame->linesize, width, height,

  1093.                       bitmap.buffer, bitmap.pitch,

  1094.                       bitmap.width, bitmap.rows,

  1095.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  1096.                       0, x1, y1);

  1097.     }

  1098. 

  1099.     return 0;

  1100. }

  1101. 

  1102. 

  1103. static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)

  1104. {

  1105.     *color = incolor;

  1106.     color->rgba[3] = (color->rgba[3] * s->alpha) / 255;

  1107.     ff_draw_color(&s->dc, color, color->rgba);

  1108. }

  1109. 

  1110. static void update_alpha(DrawTextContext *s)

  1111. {

  1112.     double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);

  1113. 

  1114.     if (isnan(alpha))

  1115.         return;

  1116. 

  1117.     if (alpha >= 1.0)

  1118.         s->alpha = 255;

  1119.     else if (alpha <= 0)

  1120.         s->alpha = 0;

  1121.     else

  1122.         s->alpha = 256 * alpha;

  1123. }

  1124. 

  1125. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  1126.                      int width, int height)

  1127. {

  1128.     DrawTextContext *s = ctx->priv;

  1129.     AVFilterLink *inlink = ctx->inputs[0];

  1130. 

  1131.     uint32_t code = 0, prev_code = 0;

  1132.     int x = 0, y = 0, i = 0, ret;

  1133.     int max_text_line_w = 0, len;

  1134.     int box_w, box_h;

  1135.     char *text;

  1136.     uint8_t *p;

  1137.     int y_min = 32000, y_max = -32000;

  1138.     int x_min = 32000, x_max = -32000;

  1139.     FT_Vector delta;

  1140.     Glyph *glyph = NULL, *prev_glyph = NULL;

  1141.     Glyph dummy = { 0 };

  1142. 

  1143.     time_t now = time(0);

  1144.     struct tm ltime;

  1145.     AVBPrint *bp = &s->expanded_text;

  1146. 

  1147.     FFDrawColor fontcolor;

  1148.     FFDrawColor shadowcolor;

  1149.     FFDrawColor bordercolor;

  1150.     FFDrawColor boxcolor;

  1151. 

  1152.     av_bprint_clear(bp);

  1153. 

  1154.     if(s->basetime != AV_NOPTS_VALUE)

  1155.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;

  1156. 

  1157.     switch (s->exp_mode) {

  1158.     case EXP_NONE:

  1159.         av_bprintf(bp, "%s", s->text);

  1160.         break;

  1161.     case EXP_NORMAL:

  1162.         if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)

  1163.             return ret;

  1164.         break;

  1165.     case EXP_STRFTIME:

  1166.         localtime_r(&now, &ltime);

  1167.         av_bprint_strftime(bp, s->text, &ltime);

  1168.         break;

  1169.     }

  1170. 

  1171.     if (s->tc_opt_string) {

  1172.         char tcbuf[AV_TIMECODE_STR_SIZE];

  1173.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);

  1174.         av_bprint_clear(bp);

  1175.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1176.     }

  1177. 

  1178.     if (!av_bprint_is_complete(bp))

  1179.         return AVERROR(ENOMEM);

  1180.     text = s->expanded_text.str;

  1181.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1182.         if (!(s->positions =

  1183.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1184.             return AVERROR(ENOMEM);

  1185.         s->nb_positions = len;

  1186.     }

  1187. 

  1188.     if (s->fontcolor_expr[0]) {

  1189.         /* If expression is set, evaluate and replace the static value */

  1190.         av_bprint_clear(&s->expanded_fontcolor);

  1191.         if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)

  1192.             return ret;

  1193.         if (!av_bprint_is_complete(&s->expanded_fontcolor))

  1194.             return AVERROR(ENOMEM);

  1195.         av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);

  1196.         ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);

  1197.         if (ret)

  1198.             return ret;

  1199.         ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);

  1200.     }

  1201. 

  1202.     x = 0;

  1203.     y = 0;

  1204. 

  1205.     /* load and cache glyphs */

  1206.     for (i = 0, p = text; *p; i++) {

  1207.         GET_UTF8(code, *p++, continue;);

  1208. 

  1209.         /* get glyph */

  1210.         dummy.code = code;

  1211.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1212.         if (!glyph) {

  1213.             load_glyph(ctx, &glyph, code);

  1214.         }

  1215. 

  1216.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1217.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1218.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1219.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1220.     }

  1221.     s->max_glyph_h = y_max - y_min;

  1222.     s->max_glyph_w = x_max - x_min;

  1223. 

  1224.     /* compute and save position for each glyph */

  1225.     glyph = NULL;

  1226.     for (i = 0, p = text; *p; i++) {

  1227.         GET_UTF8(code, *p++, continue;);

  1228. 

  1229.         /* skip the \n in the sequence \r\n */

  1230.         if (prev_code == '\r' && code == '\n')

  1231.             continue;

  1232. 

  1233.         prev_code = code;

  1234.         if (is_newline(code)) {

  1235. 

  1236.             max_text_line_w = FFMAX(max_text_line_w, x);

  1237.             y += s->max_glyph_h;

  1238.             x = 0;

  1239.             continue;

  1240.         }

  1241. 

  1242.         /* get glyph */

  1243.         prev_glyph = glyph;

  1244.         dummy.code = code;

  1245.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1246. 

  1247.         /* kerning */

  1248.         if (s->use_kerning && prev_glyph && glyph->code) {

  1249.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1250.                            ft_kerning_default, &delta);

  1251.             x += delta.x >> 6;

  1252.         }

  1253. 

  1254.         /* save position */

  1255.         s->positions[i].x = x + glyph->bitmap_left;

  1256.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1257.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1258.         else              x += glyph->advance;

  1259.     }

  1260. 

  1261.     max_text_line_w = FFMAX(x, max_text_line_w);

  1262. 

  1263.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1264.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1265. 

  1266.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1267.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1268.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1269.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1270. 

  1271.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1272. 

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

  1274.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1275.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1276. 

  1277.     update_alpha(s);

  1278.     update_color_with_alpha(s, &fontcolor  , s->fontcolor  );

  1279.     update_color_with_alpha(s, &shadowcolor, s->shadowcolor);

  1280.     update_color_with_alpha(s, &bordercolor, s->bordercolor);

  1281.     update_color_with_alpha(s, &boxcolor   , s->boxcolor   );

  1282. 

  1283.     box_w = FFMIN(width - 1 , max_text_line_w);

  1284.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1285. 

  1286.     /* draw box */

  1287.     if (s->draw_box)

  1288.         ff_blend_rectangle(&s->dc, &boxcolor,

  1289.                            frame->data, frame->linesize, width, height,

  1290.                            s->x - s->boxborderw, s->y - s->boxborderw,

  1291.                            box_w + s->boxborderw * 2, box_h + s->boxborderw * 2);

  1292. 

  1293.     if (s->shadowx || s->shadowy) {

  1294.         if ((ret = draw_glyphs(s, frame, width, height,

  1295.                                &shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1296.             return ret;

  1297.     }

  1298. 

  1299.     if (s->borderw) {

  1300.         if ((ret = draw_glyphs(s, frame, width, height,

  1301.                                &bordercolor, 0, 0, s->borderw)) < 0)

  1302.             return ret;

  1303.     }

  1304.     if ((ret = draw_glyphs(s, frame, width, height,

  1305.                            &fontcolor, 0, 0, 0)) < 0)

  1306.         return ret;

  1307. 

  1308.     return 0;

  1309. }

  1310. 

  1311. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1312. {

  1313.     AVFilterContext *ctx = inlink->dst;

  1314.     AVFilterLink *outlink = ctx->outputs[0];

  1315.     DrawTextContext *s = ctx->priv;

  1316.     int ret;

  1317. 

  1318.     if (s->reload) {

  1319.         if ((ret = load_textfile(ctx)) < 0) {

  1320.             av_frame_free(&frame);

  1321.             return ret;

  1322.         }

  1323. #if CONFIG_LIBFRIBIDI

  1324.         if (s->text_shaping)

  1325.             if ((ret = shape_text(ctx)) < 0) {

  1326.                 av_frame_free(&frame);

  1327.                 return ret;

  1328.             }

  1329. #endif

  1330.     }

  1331. 

  1332.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;

  1333.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1334.         NAN : frame->pts * av_q2d(inlink->time_base);

  1335. 

  1336.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1337.     s->metadata = av_frame_get_metadata(frame);

  1338. 

  1339.     draw_text(ctx, frame, frame->width, frame->height);

  1340. 

  1341.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1342.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1343.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1344.            s->x, s->y);

  1345. 

  1346.     return ff_filter_frame(outlink, frame);

  1347. }

  1348. 

  1349. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1350.     {

  1351.         .name           = "default",

  1352.         .type           = AVMEDIA_TYPE_VIDEO,

  1353.         .filter_frame   = filter_frame,

  1354.         .config_props   = config_input,

  1355.         .needs_writable = 1,

  1356.     },

  1357.     { NULL }

  1358. };

  1359. 

  1360. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1361.     {

  1362.         .name = "default",

  1363.         .type = AVMEDIA_TYPE_VIDEO,

  1364.     },

  1365.     { NULL }

  1366. };

  1367. 

  1368. AVFilter ff_vf_drawtext = {

  1369.     .name          = "drawtext",

  1370.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1371.     .priv_size     = sizeof(DrawTextContext),

  1372.     .priv_class    = &drawtext_class,

  1373.     .init          = init,

  1374.     .uninit        = uninit,

  1375.     .query_formats = query_formats,

  1376.     .inputs        = avfilter_vf_drawtext_inputs,

  1377.     .outputs       = avfilter_vf_drawtext_outputs,

  1378.     .process_command = command,

  1379.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1380. };