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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.     char *fontsize_expr;            ///< expression for fontsize

  160.     AVExpr *fontsize_pexpr;         ///< parsed expressions for fontsize

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

  162.     unsigned int default_fontsize;  ///< default font size to use

  163. 

  164.     int line_spacing;               ///< lines spacing in pixels

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

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

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

  168.     int tabsize;                    ///< tab size

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

  170. 

  171.     FFDrawContext dc;

  172.     FFDrawColor fontcolor;          ///< foreground color

  173.     FFDrawColor shadowcolor;        ///< shadow color

  174.     FFDrawColor bordercolor;        ///< border color

  175.     FFDrawColor boxcolor;           ///< background color

  176. 

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

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

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

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

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

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

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

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

  185.     double var_values[VAR_VARS_NB];

  186.     char   *a_expr;

  187.     AVExpr *a_pexpr;

  188.     int alpha;

  189.     AVLFG  prng;                    ///< random

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

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

  192.     AVTimecode  tc;                 ///< timecode context

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

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

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

  196. #if CONFIG_LIBFRIBIDI

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

  198. #endif

  199.     AVDictionary *metadata;

  200. } DrawTextContext;

  201. 

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

  203. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  204. 

  205. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

  216.     {"line_spacing",  "set line spacing in pixels", OFFSET(line_spacing),   AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX,FLAGS},

  217.     {"fontsize",    "set font size",        OFFSET(fontsize_expr),      AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX , FLAGS},

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

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

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

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

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

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

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

  225. #if CONFIG_LIBFONTCONFIG

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

  227. #endif

  228. 

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

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

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

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

  233. 

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

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

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

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

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

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

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

  241.     {"fix_bounds", "check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},

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

  243. 

  244. #if CONFIG_LIBFRIBIDI

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

  246. #endif

  247. 

  248.     /* FT_LOAD_* flags */

  249.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  265.     { NULL }

  266. };

  267. 

  268. AVFILTER_DEFINE_CLASS(drawtext);

  269. 

  270. #undef __FTERRORS_H__

  271. #define FT_ERROR_START_LIST {

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

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

  274. 

  275. static const struct ft_error {

  276.     int err;

  277.     const char *err_msg;

  278. } ft_errors[] =

  279. #include FT_ERRORS_H

  280. 

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

  282. 

  283. typedef struct Glyph {

  284.     FT_Glyph glyph;

  285.     FT_Glyph border_glyph;

  286.     uint32_t code;

  287.     unsigned int fontsize;

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

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

  290.     FT_BBox bbox;

  291.     int advance;

  292.     int bitmap_left;

  293.     int bitmap_top;

  294. } Glyph;

  295. 

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

  297. {

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

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

  300. 

  301.     if (diff != 0)

  302.          return diff > 0 ? 1 : -1;

  303.     else

  304.          return FFDIFFSIGN((int64_t)a->fontsize, (int64_t)bb->fontsize);

  305. }

  306. 

  307. /**

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

  309.  */

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

  311. {

  312.     DrawTextContext *s = ctx->priv;

  313.     FT_BitmapGlyph bitmapglyph;

  314.     Glyph *glyph;

  315.     struct AVTreeNode *node = NULL;

  316.     int ret;

  317. 

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

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

  320.         return AVERROR(EINVAL);

  321. 

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

  323.     if (!glyph) {

  324.         ret = AVERROR(ENOMEM);

  325.         goto error;

  326.     }

  327.     glyph->code  = code;

  328.     glyph->fontsize = s->fontsize;

  329. 

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

  331.         ret = AVERROR(EINVAL);

  332.         goto error;

  333.     }

  334.     if (s->borderw) {

  335.         glyph->border_glyph = glyph->glyph;

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

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

  338.             ret = AVERROR_EXTERNAL;

  339.             goto error;

  340.         }

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

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

  343.     }

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

  345.         ret = AVERROR_EXTERNAL;

  346.         goto error;

  347.     }

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

  349. 

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

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

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

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

  354. 

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

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

  357. 

  358.     /* cache the newly created glyph */

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

  360.         ret = AVERROR(ENOMEM);

  361.         goto error;

  362.     }

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

  364. 

  365.     if (glyph_ptr)

  366.         *glyph_ptr = glyph;

  367.     return 0;

  368. 

  369. error:

  370.     if (glyph)

  371.         av_freep(&glyph->glyph);

  372. 

  373.     av_freep(&glyph);

  374.     av_freep(&node);

  375.     return ret;

  376. }

  377. 

  378. static av_cold int set_fontsize(AVFilterContext *ctx, unsigned int fontsize)

  379. {

  380.     int err;

  381.     DrawTextContext *s = ctx->priv;

  382. 

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

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

  385.                fontsize, FT_ERRMSG(err));

  386.         return AVERROR(EINVAL);

  387.     }

  388. 

  389.     s->fontsize = fontsize;

  390. 

  391.     return 0;

  392. }

  393. 

  394. static av_cold int parse_fontsize(AVFilterContext *ctx)

  395. {

  396.     DrawTextContext *s = ctx->priv;

  397.     int err;

  398. 

  399.     if (s->fontsize_pexpr)

  400.         return 0;

  401. 

  402.     if (s->fontsize_expr == NULL)

  403.         return AVERROR(EINVAL);

  404. 

  405.     if ((err = av_expr_parse(&s->fontsize_pexpr, s->fontsize_expr, var_names,

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

  407.         return err;

  408. 

  409.     return 0;

  410. }

  411. 

  412. static av_cold int update_fontsize(AVFilterContext *ctx)

  413. {

  414.     DrawTextContext *s = ctx->priv;

  415.     unsigned int fontsize = s->default_fontsize;

  416.     int err;

  417.     double size, roundedsize;

  418. 

  419.     // if no fontsize specified use the default

  420.     if (s->fontsize_expr != NULL) {

  421.         if ((err = parse_fontsize(ctx)) < 0)

  422.            return err;

  423. 

  424.         size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng);

  425. 

  426.         if (!isnan(size)) {

  427.             roundedsize = round(size);

  428.             // test for overflow before cast

  429.             if (!(roundedsize > INT_MIN && roundedsize < INT_MAX)) {

  430.                 av_log(ctx, AV_LOG_ERROR, "fontsize overflow\n");

  431.                 return AVERROR(EINVAL);

  432.             }

  433. 

  434.             fontsize = roundedsize;

  435.         }

  436.     }

  437. 

  438.     if (fontsize == 0)

  439.         fontsize = 1;

  440. 

  441.     // no change

  442.     if (fontsize == s->fontsize)

  443.         return 0;

  444. 

  445.     return set_fontsize(ctx, fontsize);

  446. }

  447. 

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

  449. {

  450.     DrawTextContext *s = ctx->priv;

  451.     int err;

  452. 

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

  454.     if (err) {

  455. #if !CONFIG_LIBFONTCONFIG

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

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

  458. #endif

  459.         return AVERROR(EINVAL);

  460.     }

  461.     return 0;

  462. }

  463. 

  464. #if CONFIG_LIBFONTCONFIG

  465. static int load_font_fontconfig(AVFilterContext *ctx)

  466. {

  467.     DrawTextContext *s = ctx->priv;

  468.     FcConfig *fontconfig;

  469.     FcPattern *pat, *best;

  470.     FcResult result = FcResultMatch;

  471.     FcChar8 *filename;

  472.     int index;

  473.     double size;

  474.     int err = AVERROR(ENOENT);

  475.     int parse_err;

  476. 

  477.     fontconfig = FcInitLoadConfigAndFonts();

  478.     if (!fontconfig) {

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

  480.         return AVERROR_UNKNOWN;

  481.     }

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

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

  484.     if (!pat) {

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

  486.         return AVERROR(EINVAL);

  487.     }

  488. 

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

  490. 

  491.     parse_err = parse_fontsize(ctx);

  492.     if (!parse_err) {

  493.         double size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng);

  494. 

  495.         if (isnan(size)) {

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

  497.             return AVERROR(EINVAL);

  498.         }

  499. 

  500.         FcPatternAddDouble(pat, FC_SIZE, size);

  501.     }

  502. 

  503.     FcDefaultSubstitute(pat);

  504. 

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

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

  507.         FcPatternDestroy(pat);

  508.         return AVERROR(ENOMEM);

  509.     }

  510. 

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

  512.     FcPatternDestroy(pat);

  513. 

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

  515.         av_log(ctx, AV_LOG_ERROR,

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

  517.                s->font);

  518.         goto fail;

  519.     }

  520. 

  521.     if (

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

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

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

  525.         return AVERROR(EINVAL);

  526.     }

  527. 

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

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

  530.                s->font);

  531.         goto fail;

  532.     }

  533. 

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

  535.     if (parse_err)

  536.         s->default_fontsize = size + 0.5;

  537. 

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

  539.     if (err)

  540.         return err;

  541.     FcConfigDestroy(fontconfig);

  542. fail:

  543.     FcPatternDestroy(best);

  544.     return err;

  545. }

  546. #endif

  547. 

  548. static int load_font(AVFilterContext *ctx)

  549. {

  550.     DrawTextContext *s = ctx->priv;

  551.     int err;

  552. 

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

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

  555.     if (!err)

  556.         return 0;

  557. #if CONFIG_LIBFONTCONFIG

  558.     err = load_font_fontconfig(ctx);

  559.     if (!err)

  560.         return 0;

  561. #endif

  562.     return err;

  563. }

  564. 

  565. static int load_textfile(AVFilterContext *ctx)

  566. {

  567.     DrawTextContext *s = ctx->priv;

  568.     int err;

  569.     uint8_t *textbuf;

  570.     uint8_t *tmp;

  571.     size_t textbuf_size;

  572. 

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

  574.         av_log(ctx, AV_LOG_ERROR,

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

  576.                s->textfile);

  577.         return err;

  578.     }

  579. 

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

  581.         av_file_unmap(textbuf, textbuf_size);

  582.         return AVERROR(ENOMEM);

  583.     }

  584.     s->text = tmp;

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

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

  587.     av_file_unmap(textbuf, textbuf_size);

  588. 

  589.     return 0;

  590. }

  591. 

  592. static inline int is_newline(uint32_t c)

  593. {

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

  595. }

  596. 

  597. #if CONFIG_LIBFRIBIDI

  598. static int shape_text(AVFilterContext *ctx)

  599. {

  600.     DrawTextContext *s = ctx->priv;

  601.     uint8_t *tmp;

  602.     int ret = AVERROR(ENOMEM);

  603.     static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |

  604.                                       FRIBIDI_FLAGS_ARABIC;

  605.     FriBidiChar *unicodestr = NULL;

  606.     FriBidiStrIndex len;

  607.     FriBidiParType direction = FRIBIDI_PAR_LTR;

  608.     FriBidiStrIndex line_start = 0;

  609.     FriBidiStrIndex line_end = 0;

  610.     FriBidiLevel *embedding_levels = NULL;

  611.     FriBidiArabicProp *ar_props = NULL;

  612.     FriBidiCharType *bidi_types = NULL;

  613.     FriBidiStrIndex i,j;

  614. 

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

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

  617.         goto out;

  618.     }

  619.     len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,

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

  621. 

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

  623.     if (!bidi_types) {

  624.         goto out;

  625.     }

  626. 

  627.     fribidi_get_bidi_types(unicodestr, len, bidi_types);

  628. 

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

  630.     if (!embedding_levels) {

  631.         goto out;

  632.     }

  633. 

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

  635.                                           embedding_levels)) {

  636.         goto out;

  637.     }

  638. 

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

  640.     if (!ar_props) {

  641.         goto out;

  642.     }

  643. 

  644.     fribidi_get_joining_types(unicodestr, len, ar_props);

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

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

  647. 

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

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

  650.             if (!fribidi_reorder_line(flags, bidi_types,

  651.                                       line_end - line_start + 1, line_start,

  652.                                       direction, embedding_levels, unicodestr,

  653.                                       NULL)) {

  654.                 goto out;

  655.             }

  656.             line_start = line_end + 1;

  657.         }

  658.     }

  659. 

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

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

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

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

  664.     len = j;

  665. 

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

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

  668.         goto out;

  669.     }

  670. 

  671.     s->text = tmp;

  672.     len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,

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

  674.     ret = 0;

  675. 

  676. out:

  677.     av_free(unicodestr);

  678.     av_free(embedding_levels);

  679.     av_free(ar_props);

  680.     av_free(bidi_types);

  681.     return ret;

  682. }

  683. #endif

  684. 

  685. static av_cold int init(AVFilterContext *ctx)

  686. {

  687.     int err;

  688.     DrawTextContext *s = ctx->priv;

  689.     Glyph *glyph;

  690. 

  691.     av_expr_free(s->fontsize_pexpr);

  692.     s->fontsize_pexpr = NULL;

  693. 

  694.     s->fontsize = 0;

  695.     s->default_fontsize = 16;

  696. 

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

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

  699.         return AVERROR(EINVAL);

  700.     }

  701. 

  702.     if (s->textfile) {

  703.         if (s->text) {

  704.             av_log(ctx, AV_LOG_ERROR,

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

  706.             return AVERROR(EINVAL);

  707.         }

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

  709.             return err;

  710.     }

  711. 

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

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

  714. 

  715.     if (s->tc_opt_string) {

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

  717.                                                s->tc_opt_string, ctx);

  718.         if (ret < 0)

  719.             return ret;

  720.         if (s->tc24hmax)

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

  722.         if (!s->text)

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

  724.     }

  725. 

  726.     if (!s->text) {

  727.         av_log(ctx, AV_LOG_ERROR,

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

  729.         return AVERROR(EINVAL);

  730.     }

  731. 

  732. #if CONFIG_LIBFRIBIDI

  733.     if (s->text_shaping)

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

  735.             return err;

  736. #endif

  737. 

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

  739.         av_log(ctx, AV_LOG_ERROR,

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

  741.         return AVERROR(EINVAL);

  742.     }

  743. 

  744.     if ((err = load_font(ctx)) < 0)

  745.         return err;

  746. 

  747.     if ((err = update_fontsize(ctx)) < 0)

  748.         return err;

  749. 

  750.     if (s->borderw) {

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

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

  753.             return AVERROR_EXTERNAL;

  754.         }

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

  756.                        FT_STROKER_LINEJOIN_ROUND, 0);

  757.     }

  758. 

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

  760. 

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

  762.     load_glyph(ctx, NULL, 0);

  763. 

  764.     /* set the tabsize in pixels */

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

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

  767.         return err;

  768.     }

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

  770. 

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

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

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

  774. 

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

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

  777. 

  778.     return 0;

  779. }

  780. 

  781. static int query_formats(AVFilterContext *ctx)

  782. {

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

  784. }

  785. 

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

  787. {

  788.     Glyph *glyph = elem;

  789. 

  790.     FT_Done_Glyph(glyph->glyph);

  791.     FT_Done_Glyph(glyph->border_glyph);

  792.     av_free(elem);

  793.     return 0;

  794. }

  795. 

  796. static av_cold void uninit(AVFilterContext *ctx)

  797. {

  798.     DrawTextContext *s = ctx->priv;

  799. 

  800.     av_expr_free(s->x_pexpr);

  801.     av_expr_free(s->y_pexpr);

  802.     av_expr_free(s->a_pexpr);

  803.     av_expr_free(s->fontsize_pexpr);

  804. 

  805.     s->x_pexpr = s->y_pexpr = s->a_pexpr = s->fontsize_pexpr = NULL;

  806. 

  807.     av_freep(&s->positions);

  808.     s->nb_positions = 0;

  809. 

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

  811.     av_tree_destroy(s->glyphs);

  812.     s->glyphs = NULL;

  813. 

  814.     FT_Done_Face(s->face);

  815.     FT_Stroker_Done(s->stroker);

  816.     FT_Done_FreeType(s->library);

  817. 

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

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

  820. }

  821. 

  822. static int config_input(AVFilterLink *inlink)

  823. {

  824.     AVFilterContext *ctx = inlink->dst;

  825.     DrawTextContext *s = ctx->priv;

  826.     int ret;

  827. 

  828.     ff_draw_init(&s->dc, inlink->format, FF_DRAW_PROCESS_ALPHA);

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

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

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

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

  833. 

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

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

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

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

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

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

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

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

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

  843. 

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

  845. 

  846.     av_expr_free(s->x_pexpr);

  847.     av_expr_free(s->y_pexpr);

  848.     av_expr_free(s->a_pexpr);

  849.     s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL;

  850. 

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

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

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

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

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

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

  857. 

  858.         return AVERROR(EINVAL);

  859. 

  860.     return 0;

  861. }

  862. 

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

  864. {

  865.     DrawTextContext *s = ctx->priv;

  866. 

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

  868.         int ret;

  869.         uninit(ctx);

  870.         s->reinit = 1;

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

  872.             return ret;

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

  874.             return ret;

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

  876.     }

  877. 

  878.     return AVERROR(ENOSYS);

  879. }

  880. 

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

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

  883. {

  884.     DrawTextContext *s = ctx->priv;

  885. 

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

  887.     return 0;

  888. }

  889. 

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

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

  892. {

  893.     DrawTextContext *s = ctx->priv;

  894.     const char *fmt;

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

  896.     int ret;

  897. 

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

  899.     if (argc >= 2) {

  900.         int64_t delta;

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

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

  903.             return ret;

  904.         }

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

  906.     }

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

  908.         av_bprintf(bp, "%.6f", pts);

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

  910.         if (isnan(pts)) {

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

  912.         } else {

  913.             int64_t ms = llrint(pts * 1000);

  914.             char sign = ' ';

  915.             if (ms < 0) {

  916.                 sign = '-';

  917.                 ms = -ms;

  918.             }

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

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

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

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

  923.                        (int)(ms % 1000));

  924.         }

  925.     } else if (!strcmp(fmt, "localtime") ||

  926.                !strcmp(fmt, "gmtime")) {

  927.         struct tm tm;

  928.         time_t ms = (time_t)pts;

  929.         const char *timefmt = argc >= 3 ? argv[2] : "%Y-%m-%d %H:%M:%S";

  930.         if (!strcmp(fmt, "localtime"))

  931.             localtime_r(&ms, &tm);

  932.         else

  933.             gmtime_r(&ms, &tm);

  934.         av_bprint_strftime(bp, timefmt, &tm);

  935.     } else {

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

  937.         return AVERROR(EINVAL);

  938.     }

  939.     return 0;

  940. }

  941. 

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

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

  944. {

  945.     DrawTextContext *s = ctx->priv;

  946. 

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

  948.     return 0;

  949. }

  950. 

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

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

  953. {

  954.     DrawTextContext *s = ctx->priv;

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

  956. 

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

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

  959.     else if (argc >= 2)

  960.         av_bprintf(bp, "%s", argv[1]);

  961.     return 0;

  962. }

  963. 

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

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

  966. {

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

  968.     time_t now;

  969.     struct tm tm;

  970. 

  971.     time(&now);

  972.     if (tag == 'L')

  973.         localtime_r(&now, &tm);

  974.     else

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

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

  977.     return 0;

  978. }

  979. 

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

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

  982. {

  983.     DrawTextContext *s = ctx->priv;

  984.     double res;

  985.     int ret;

  986. 

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

  988.                                  NULL, NULL, fun2_names, fun2,

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

  990.     if (ret < 0)

  991.         av_log(ctx, AV_LOG_ERROR,

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

  993.                argv[0]);

  994.     else

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

  996. 

  997.     return ret;

  998. }

  999. 

  1000. static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,

  1001.                           char *fct, unsigned argc, char **argv, int tag)

  1002. {

  1003.     DrawTextContext *s = ctx->priv;

  1004.     double res;

  1005.     int intval;

  1006.     int ret;

  1007.     unsigned int positions = 0;

  1008.     char fmt_str[30] = "%";

  1009. 

  1010.     /*

  1011.      * argv[0] expression to be converted to `int`

  1012.      * argv[1] format: 'x', 'X', 'd' or 'u'

  1013.      * argv[2] positions printed (optional)

  1014.      */

  1015. 

  1016.     ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,

  1017.                                  NULL, NULL, fun2_names, fun2,

  1018.                                  &s->prng, 0, ctx);

  1019.     if (ret < 0) {

  1020.         av_log(ctx, AV_LOG_ERROR,

  1021.                "Expression '%s' for the expr text expansion function is not valid\n",

  1022.                argv[0]);

  1023.         return ret;

  1024.     }

  1025. 

  1026.     if (!strchr("xXdu", argv[1][0])) {

  1027.         av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"

  1028.                 " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);

  1029.         return AVERROR(EINVAL);

  1030.     }

  1031. 

  1032.     if (argc == 3) {

  1033.         ret = sscanf(argv[2], "%u", &positions);

  1034.         if (ret != 1) {

  1035.             av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"

  1036.                     " to print: '%s'\n", argv[2]);

  1037.             return AVERROR(EINVAL);

  1038.         }

  1039.     }

  1040. 

  1041.     feclearexcept(FE_ALL_EXCEPT);

  1042.     intval = res;

  1043.     if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {

  1044.         av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);

  1045.         return AVERROR(EINVAL);

  1046.     }

  1047. 

  1048.     if (argc == 3)

  1049.         av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);

  1050.     av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);

  1051. 

  1052.     av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",

  1053.             res, argv[0], fmt_str);

  1054. 

  1055.     av_bprintf(bp, fmt_str, intval);

  1056. 

  1057.     return 0;

  1058. }

  1059. 

  1060. static const struct drawtext_function {

  1061.     const char *name;

  1062.     unsigned argc_min, argc_max;

  1063.     int tag;                            /**< opaque argument to func */

  1064.     int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);

  1065. } functions[] = {

  1066.     { "expr",      1, 1, 0,   func_eval_expr },

  1067.     { "e",         1, 1, 0,   func_eval_expr },

  1068.     { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },

  1069.     { "eif",       2, 3, 0,   func_eval_expr_int_format },

  1070.     { "pict_type", 0, 0, 0,   func_pict_type },

  1071.     { "pts",       0, 3, 0,   func_pts      },

  1072.     { "gmtime",    0, 1, 'G', func_strftime },

  1073.     { "localtime", 0, 1, 'L', func_strftime },

  1074.     { "frame_num", 0, 0, 0,   func_frame_num },

  1075.     { "n",         0, 0, 0,   func_frame_num },

  1076.     { "metadata",  1, 2, 0,   func_metadata },

  1077. };

  1078. 

  1079. static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,

  1080.                          unsigned argc, char **argv)

  1081. {

  1082.     unsigned i;

  1083. 

  1084.     for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {

  1085.         if (strcmp(fct, functions[i].name))

  1086.             continue;

  1087.         if (argc < functions[i].argc_min) {

  1088.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",

  1089.                    fct, functions[i].argc_min);

  1090.             return AVERROR(EINVAL);

  1091.         }

  1092.         if (argc > functions[i].argc_max) {

  1093.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",

  1094.                    fct, functions[i].argc_max);

  1095.             return AVERROR(EINVAL);

  1096.         }

  1097.         break;

  1098.     }

  1099.     if (i >= FF_ARRAY_ELEMS(functions)) {

  1100.         av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);

  1101.         return AVERROR(EINVAL);

  1102.     }

  1103.     return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);

  1104. }

  1105. 

  1106. static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)

  1107. {

  1108.     const char *text = *rtext;

  1109.     char *argv[16] = { NULL };

  1110.     unsigned argc = 0, i;

  1111.     int ret;

  1112. 

  1113.     if (*text != '{') {

  1114.         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);

  1115.         return AVERROR(EINVAL);

  1116.     }

  1117.     text++;

  1118.     while (1) {

  1119.         if (!(argv[argc++] = av_get_token(&text, ":}"))) {

  1120.             ret = AVERROR(ENOMEM);

  1121.             goto end;

  1122.         }

  1123.         if (!*text) {

  1124.             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);

  1125.             ret = AVERROR(EINVAL);

  1126.             goto end;

  1127.         }

  1128.         if (argc == FF_ARRAY_ELEMS(argv))

  1129.             av_freep(&argv[--argc]); /* error will be caught later */

  1130.         if (*text == '}')

  1131.             break;

  1132.         text++;

  1133.     }

  1134. 

  1135.     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)

  1136.         goto end;

  1137.     ret = 0;

  1138.     *rtext = (char *)text + 1;

  1139. 

  1140. end:

  1141.     for (i = 0; i < argc; i++)

  1142.         av_freep(&argv[i]);

  1143.     return ret;

  1144. }

  1145. 

  1146. static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)

  1147. {

  1148.     int ret;

  1149. 

  1150.     av_bprint_clear(bp);

  1151.     while (*text) {

  1152.         if (*text == '\\' && text[1]) {

  1153.             av_bprint_chars(bp, text[1], 1);

  1154.             text += 2;

  1155.         } else if (*text == '%') {

  1156.             text++;

  1157.             if ((ret = expand_function(ctx, bp, &text)) < 0)

  1158.                 return ret;

  1159.         } else {

  1160.             av_bprint_chars(bp, *text, 1);

  1161.             text++;

  1162.         }

  1163.     }

  1164.     if (!av_bprint_is_complete(bp))

  1165.         return AVERROR(ENOMEM);

  1166.     return 0;

  1167. }

  1168. 

  1169. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  1170.                        int width, int height,

  1171.                        FFDrawColor *color,

  1172.                        int x, int y, int borderw)

  1173. {

  1174.     char *text = s->expanded_text.str;

  1175.     uint32_t code = 0;

  1176.     int i, x1, y1;

  1177.     uint8_t *p;

  1178.     Glyph *glyph = NULL;

  1179. 

  1180.     for (i = 0, p = text; *p; i++) {

  1181.         FT_Bitmap bitmap;

  1182.         Glyph dummy = { 0 };

  1183.         GET_UTF8(code, *p++, continue;);

  1184. 

  1185.         /* skip new line chars, just go to new line */

  1186.         if (code == '\n' || code == '\r' || code == '\t')

  1187.             continue;

  1188. 

  1189.         dummy.code = code;

  1190.         dummy.fontsize = s->fontsize;

  1191.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1192. 

  1193.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  1194. 

  1195.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  1196.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  1197.             return AVERROR(EINVAL);

  1198. 

  1199.         x1 = s->positions[i].x+s->x+x - borderw;

  1200.         y1 = s->positions[i].y+s->y+y - borderw;

  1201. 

  1202.         ff_blend_mask(&s->dc, color,

  1203.                       frame->data, frame->linesize, width, height,

  1204.                       bitmap.buffer, bitmap.pitch,

  1205.                       bitmap.width, bitmap.rows,

  1206.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  1207.                       0, x1, y1);

  1208.     }

  1209. 

  1210.     return 0;

  1211. }

  1212. 

  1213. 

  1214. static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)

  1215. {

  1216.     *color = incolor;

  1217.     color->rgba[3] = (color->rgba[3] * s->alpha) / 255;

  1218.     ff_draw_color(&s->dc, color, color->rgba);

  1219. }

  1220. 

  1221. static void update_alpha(DrawTextContext *s)

  1222. {

  1223.     double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);

  1224. 

  1225.     if (isnan(alpha))

  1226.         return;

  1227. 

  1228.     if (alpha >= 1.0)

  1229.         s->alpha = 255;

  1230.     else if (alpha <= 0)

  1231.         s->alpha = 0;

  1232.     else

  1233.         s->alpha = 256 * alpha;

  1234. }

  1235. 

  1236. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  1237.                      int width, int height)

  1238. {

  1239.     DrawTextContext *s = ctx->priv;

  1240.     AVFilterLink *inlink = ctx->inputs[0];

  1241. 

  1242.     uint32_t code = 0, prev_code = 0;

  1243.     int x = 0, y = 0, i = 0, ret;

  1244.     int max_text_line_w = 0, len;

  1245.     int box_w, box_h;

  1246.     char *text;

  1247.     uint8_t *p;

  1248.     int y_min = 32000, y_max = -32000;

  1249.     int x_min = 32000, x_max = -32000;

  1250.     FT_Vector delta;

  1251.     Glyph *glyph = NULL, *prev_glyph = NULL;

  1252.     Glyph dummy = { 0 };

  1253. 

  1254.     time_t now = time(0);

  1255.     struct tm ltime;

  1256.     AVBPrint *bp = &s->expanded_text;

  1257. 

  1258.     FFDrawColor fontcolor;

  1259.     FFDrawColor shadowcolor;

  1260.     FFDrawColor bordercolor;

  1261.     FFDrawColor boxcolor;

  1262. 

  1263.     av_bprint_clear(bp);

  1264. 

  1265.     if(s->basetime != AV_NOPTS_VALUE)

  1266.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;

  1267. 

  1268.     switch (s->exp_mode) {

  1269.     case EXP_NONE:

  1270.         av_bprintf(bp, "%s", s->text);

  1271.         break;

  1272.     case EXP_NORMAL:

  1273.         if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)

  1274.             return ret;

  1275.         break;

  1276.     case EXP_STRFTIME:

  1277.         localtime_r(&now, &ltime);

  1278.         av_bprint_strftime(bp, s->text, &ltime);

  1279.         break;

  1280.     }

  1281. 

  1282.     if (s->tc_opt_string) {

  1283.         char tcbuf[AV_TIMECODE_STR_SIZE];

  1284.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out);

  1285.         av_bprint_clear(bp);

  1286.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1287.     }

  1288. 

  1289.     if (!av_bprint_is_complete(bp))

  1290.         return AVERROR(ENOMEM);

  1291.     text = s->expanded_text.str;

  1292.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1293.         if (!(s->positions =

  1294.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1295.             return AVERROR(ENOMEM);

  1296.         s->nb_positions = len;

  1297.     }

  1298. 

  1299.     if (s->fontcolor_expr[0]) {

  1300.         /* If expression is set, evaluate and replace the static value */

  1301.         av_bprint_clear(&s->expanded_fontcolor);

  1302.         if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)

  1303.             return ret;

  1304.         if (!av_bprint_is_complete(&s->expanded_fontcolor))

  1305.             return AVERROR(ENOMEM);

  1306.         av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);

  1307.         ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);

  1308.         if (ret)

  1309.             return ret;

  1310.         ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);

  1311.     }

  1312. 

  1313.     x = 0;

  1314.     y = 0;

  1315. 

  1316.     if ((ret = update_fontsize(ctx)) < 0)

  1317.         return ret;

  1318. 

  1319.     /* load and cache glyphs */

  1320.     for (i = 0, p = text; *p; i++) {

  1321.         GET_UTF8(code, *p++, continue;);

  1322. 

  1323.         /* get glyph */

  1324.         dummy.code = code;

  1325.         dummy.fontsize = s->fontsize;

  1326.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1327.         if (!glyph) {

  1328.             ret = load_glyph(ctx, &glyph, code);

  1329.             if (ret < 0)

  1330.                 return ret;

  1331.         }

  1332. 

  1333.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1334.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1335.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1336.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1337.     }

  1338.     s->max_glyph_h = y_max - y_min;

  1339.     s->max_glyph_w = x_max - x_min;

  1340. 

  1341.     /* compute and save position for each glyph */

  1342.     glyph = NULL;

  1343.     for (i = 0, p = text; *p; i++) {

  1344.         GET_UTF8(code, *p++, continue;);

  1345. 

  1346.         /* skip the \n in the sequence \r\n */

  1347.         if (prev_code == '\r' && code == '\n')

  1348.             continue;

  1349. 

  1350.         prev_code = code;

  1351.         if (is_newline(code)) {

  1352. 

  1353.             max_text_line_w = FFMAX(max_text_line_w, x);

  1354.             y += s->max_glyph_h + s->line_spacing;

  1355.             x = 0;

  1356.             continue;

  1357.         }

  1358. 

  1359.         /* get glyph */

  1360.         prev_glyph = glyph;

  1361.         dummy.code = code;

  1362.         dummy.fontsize = s->fontsize;

  1363.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1364. 

  1365.         /* kerning */

  1366.         if (s->use_kerning && prev_glyph && glyph->code) {

  1367.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1368.                            ft_kerning_default, &delta);

  1369.             x += delta.x >> 6;

  1370.         }

  1371. 

  1372.         /* save position */

  1373.         s->positions[i].x = x + glyph->bitmap_left;

  1374.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1375.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1376.         else              x += glyph->advance;

  1377.     }

  1378. 

  1379.     max_text_line_w = FFMAX(x, max_text_line_w);

  1380. 

  1381.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1382.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1383. 

  1384.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1385.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1386.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1387.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1388. 

  1389.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1390. 

  1391.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1392.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1393.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1394. 

  1395.     update_alpha(s);

  1396.     update_color_with_alpha(s, &fontcolor  , s->fontcolor  );

  1397.     update_color_with_alpha(s, &shadowcolor, s->shadowcolor);

  1398.     update_color_with_alpha(s, &bordercolor, s->bordercolor);

  1399.     update_color_with_alpha(s, &boxcolor   , s->boxcolor   );

  1400. 

  1401.     box_w = FFMIN(width - 1 , max_text_line_w);

  1402.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1403. 

  1404.     /* draw box */

  1405.     if (s->draw_box)

  1406.         ff_blend_rectangle(&s->dc, &boxcolor,

  1407.                            frame->data, frame->linesize, width, height,

  1408.                            s->x - s->boxborderw, s->y - s->boxborderw,

  1409.                            box_w + s->boxborderw * 2, box_h + s->boxborderw * 2);

  1410. 

  1411.     if (s->shadowx || s->shadowy) {

  1412.         if ((ret = draw_glyphs(s, frame, width, height,

  1413.                                &shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1414.             return ret;

  1415.     }

  1416. 

  1417.     if (s->borderw) {

  1418.         if ((ret = draw_glyphs(s, frame, width, height,

  1419.                                &bordercolor, 0, 0, s->borderw)) < 0)

  1420.             return ret;

  1421.     }

  1422.     if ((ret = draw_glyphs(s, frame, width, height,

  1423.                            &fontcolor, 0, 0, 0)) < 0)

  1424.         return ret;

  1425. 

  1426.     return 0;

  1427. }

  1428. 

  1429. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1430. {

  1431.     AVFilterContext *ctx = inlink->dst;

  1432.     AVFilterLink *outlink = ctx->outputs[0];

  1433.     DrawTextContext *s = ctx->priv;

  1434.     int ret;

  1435. 

  1436.     if (s->reload) {

  1437.         if ((ret = load_textfile(ctx)) < 0) {

  1438.             av_frame_free(&frame);

  1439.             return ret;

  1440.         }

  1441. #if CONFIG_LIBFRIBIDI

  1442.         if (s->text_shaping)

  1443.             if ((ret = shape_text(ctx)) < 0) {

  1444.                 av_frame_free(&frame);

  1445.                 return ret;

  1446.             }

  1447. #endif

  1448.     }

  1449. 

  1450.     s->var_values[VAR_N] = inlink->frame_count_out + s->start_number;

  1451.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1452.         NAN : frame->pts * av_q2d(inlink->time_base);

  1453. 

  1454.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1455.     s->metadata = frame->metadata;

  1456. 

  1457.     draw_text(ctx, frame, frame->width, frame->height);

  1458. 

  1459.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1460.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1461.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1462.            s->x, s->y);

  1463. 

  1464.     return ff_filter_frame(outlink, frame);

  1465. }

  1466. 

  1467. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1468.     {

  1469.         .name           = "default",

  1470.         .type           = AVMEDIA_TYPE_VIDEO,

  1471.         .filter_frame   = filter_frame,

  1472.         .config_props   = config_input,

  1473.         .needs_writable = 1,

  1474.     },

  1475.     { NULL }

  1476. };

  1477. 

  1478. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1479.     {

  1480.         .name = "default",

  1481.         .type = AVMEDIA_TYPE_VIDEO,

  1482.     },

  1483.     { NULL }

  1484. };

  1485. 

  1486. AVFilter ff_vf_drawtext = {

  1487.     .name          = "drawtext",

  1488.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1489.     .priv_size     = sizeof(DrawTextContext),

  1490.     .priv_class    = &drawtext_class,

  1491.     .init          = init,

  1492.     .uninit        = uninit,

  1493.     .query_formats = query_formats,

  1494.     .inputs        = avfilter_vf_drawtext_inputs,

  1495.     .outputs       = avfilter_vf_drawtext_outputs,

  1496.     .process_command = command,

  1497.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1498. };