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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. 

  41. #if CONFIG_LIBFONTCONFIG

  42. #include <fontconfig/fontconfig.h>

  43. #endif

  44. 

  45. #include "libavutil/avstring.h"

  46. #include "libavutil/bprint.h"

  47. #include "libavutil/common.h"

  48. #include "libavutil/file.h"

  49. #include "libavutil/eval.h"

  50. #include "libavutil/opt.h"

  51. #include "libavutil/random_seed.h"

  52. #include "libavutil/parseutils.h"

  53. #include "libavutil/timecode.h"

  54. #include "libavutil/tree.h"

  55. #include "libavutil/lfg.h"

  56. #include "avfilter.h"

  57. #include "drawutils.h"

  58. #include "formats.h"

  59. #include "internal.h"

  60. #include "video.h"

  61. 

  62. #if CONFIG_LIBFRIBIDI

  63. #include <fribidi.h>

  64. #endif

  65. 

  66. #include <ft2build.h>

  67. #include FT_FREETYPE_H

  68. #include FT_GLYPH_H

  69. #include FT_STROKER_H

  70. 

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

  72.     "dar",

  73.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  82.     "sar",

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

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

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

  86.     "x",

  87.     "y",

  88.     "pict_type",

  89.     NULL

  90. };

  91. 

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

  93.     "rand"

  94. };

  95. 

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

  97. {

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

  99. }

  100. 

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

  102. 

  103. static const eval_func2 fun2[] = {

  104.     drand,

  105.     NULL

  106. };

  107. 

  108. enum var_name {

  109.     VAR_DAR,

  110.     VAR_HSUB, VAR_VSUB,

  111.     VAR_LINE_H, VAR_LH,

  112.     VAR_MAIN_H, VAR_h, VAR_H,

  113.     VAR_MAIN_W, VAR_w, VAR_W,

  114.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  115.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  116.     VAR_MAX_GLYPH_H,

  117.     VAR_MAX_GLYPH_W,

  118.     VAR_N,

  119.     VAR_SAR,

  120.     VAR_T,

  121.     VAR_TEXT_H, VAR_TH,

  122.     VAR_TEXT_W, VAR_TW,

  123.     VAR_X,

  124.     VAR_Y,

  125.     VAR_PICT_TYPE,

  126.     VAR_VARS_NB

  127. };

  128. 

  129. enum expansion_mode {

  130.     EXP_NONE,

  131.     EXP_NORMAL,

  132.     EXP_STRFTIME,

  133. };

  134. 

  135. typedef struct DrawTextContext {

  136.     const AVClass *class;

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

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

  139. #if CONFIG_LIBFONTCONFIG

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

  141. #endif

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

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

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

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

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

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

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

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

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

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

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

  153.     int shadowx, shadowy;

  154.     int borderw;                    ///< border width

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

  156. 

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

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

  159.     int tabsize;                    ///< tab size

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

  161. 

  162.     FFDrawContext dc;

  163.     FFDrawColor fontcolor;          ///< foreground color

  164.     FFDrawColor shadowcolor;        ///< shadow color

  165.     FFDrawColor bordercolor;        ///< border color

  166.     FFDrawColor boxcolor;           ///< background color

  167. 

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

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

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

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

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

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

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

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

  176.     double var_values[VAR_VARS_NB];

  177. #if FF_API_DRAWTEXT_OLD_TIMELINE

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

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

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

  181. #endif

  182.     AVLFG  prng;                    ///< random

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

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

  185.     AVTimecode  tc;                 ///< timecode context

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

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

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

  189. #if CONFIG_LIBFRIBIDI

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

  191. #endif

  192.     AVDictionary *metadata;

  193. } DrawTextContext;

  194. 

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

  196. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  197. 

  198. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  215. #if FF_API_DRAWTEXT_OLD_TIMELINE

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

  217. #endif

  218. #if CONFIG_LIBFONTCONFIG

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

  220. #endif

  221. 

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

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

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

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

  226. 

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

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

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

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

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

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

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

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

  235. 

  236. #if CONFIG_LIBFRIBIDI

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

  238. #endif

  239. 

  240.     /* FT_LOAD_* flags */

  241.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  257.     { NULL }

  258. };

  259. 

  260. AVFILTER_DEFINE_CLASS(drawtext);

  261. 

  262. #undef __FTERRORS_H__

  263. #define FT_ERROR_START_LIST {

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

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

  266. 

  267. struct ft_error

  268. {

  269.     int err;

  270.     const char *err_msg;

  271. } static ft_errors[] =

  272. #include FT_ERRORS_H

  273. 

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

  275. 

  276. typedef struct Glyph {

  277.     FT_Glyph glyph;

  278.     FT_Glyph border_glyph;

  279.     uint32_t code;

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

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

  282.     FT_BBox bbox;

  283.     int advance;

  284.     int bitmap_left;

  285.     int bitmap_top;

  286. } Glyph;

  287. 

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

  289. {

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

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

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

  293. }

  294. 

  295. /**

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

  297.  */

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

  299. {

  300.     DrawTextContext *s = ctx->priv;

  301.     FT_BitmapGlyph bitmapglyph;

  302.     Glyph *glyph;

  303.     struct AVTreeNode *node = NULL;

  304.     int ret;

  305. 

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

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

  308.         return AVERROR(EINVAL);

  309. 

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

  311.     if (!glyph) {

  312.         ret = AVERROR(ENOMEM);

  313.         goto error;

  314.     }

  315.     glyph->code  = code;

  316. 

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

  318.         ret = AVERROR(EINVAL);

  319.         goto error;

  320.     }

  321.     if (s->borderw) {

  322.         glyph->border_glyph = glyph->glyph;

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

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

  325.             ret = AVERROR_EXTERNAL;

  326.             goto error;

  327.         }

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

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

  330.     }

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

  332.         ret = AVERROR_EXTERNAL;

  333.         goto error;

  334.     }

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

  336. 

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

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

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

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

  341. 

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

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

  344. 

  345.     /* cache the newly created glyph */

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

  347.         ret = AVERROR(ENOMEM);

  348.         goto error;

  349.     }

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

  351. 

  352.     if (glyph_ptr)

  353.         *glyph_ptr = glyph;

  354.     return 0;

  355. 

  356. error:

  357.     if (glyph)

  358.         av_freep(&glyph->glyph);

  359. 

  360.     av_freep(&glyph);

  361.     av_freep(&node);

  362.     return ret;

  363. }

  364. 

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

  366. {

  367.     DrawTextContext *s = ctx->priv;

  368.     int err;

  369. 

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

  371.     if (err) {

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

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

  374.         return AVERROR(EINVAL);

  375.     }

  376.     return 0;

  377. }

  378. 

  379. #if CONFIG_LIBFONTCONFIG

  380. static int load_font_fontconfig(AVFilterContext *ctx)

  381. {

  382.     DrawTextContext *s = ctx->priv;

  383.     FcConfig *fontconfig;

  384.     FcPattern *pat, *best;

  385.     FcResult result = FcResultMatch;

  386.     FcChar8 *filename;

  387.     int index;

  388.     double size;

  389.     int err = AVERROR(ENOENT);

  390. 

  391.     fontconfig = FcInitLoadConfigAndFonts();

  392.     if (!fontconfig) {

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

  394.         return AVERROR_UNKNOWN;

  395.     }

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

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

  398.     if (!pat) {

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

  400.         return AVERROR(EINVAL);

  401.     }

  402. 

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

  404.     if (s->fontsize)

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

  406. 

  407.     FcDefaultSubstitute(pat);

  408. 

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

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

  411.         FcPatternDestroy(pat);

  412.         return AVERROR(ENOMEM);

  413.     }

  414. 

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

  416.     FcPatternDestroy(pat);

  417. 

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

  419.         av_log(ctx, AV_LOG_ERROR,

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

  421.                s->font);

  422.         goto fail;

  423.     }

  424. 

  425.     if (

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

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

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

  429.         return AVERROR(EINVAL);

  430.     }

  431. 

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

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

  434.                s->font);

  435.         goto fail;

  436.     }

  437. 

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

  439.     if (!s->fontsize)

  440.         s->fontsize = size + 0.5;

  441. 

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

  443.     if (err)

  444.         return err;

  445.     FcConfigDestroy(fontconfig);

  446. fail:

  447.     FcPatternDestroy(best);

  448.     return err;

  449. }

  450. #endif

  451. 

  452. static int load_font(AVFilterContext *ctx)

  453. {

  454.     DrawTextContext *s = ctx->priv;

  455.     int err;

  456. 

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

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

  459.     if (!err)

  460.         return 0;

  461. #if CONFIG_LIBFONTCONFIG

  462.     err = load_font_fontconfig(ctx);

  463.     if (!err)

  464.         return 0;

  465. #endif

  466.     return err;

  467. }

  468. 

  469. static int load_textfile(AVFilterContext *ctx)

  470. {

  471.     DrawTextContext *s = ctx->priv;

  472.     int err;

  473.     uint8_t *textbuf;

  474.     uint8_t *tmp;

  475.     size_t textbuf_size;

  476. 

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

  478.         av_log(ctx, AV_LOG_ERROR,

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

  480.                s->textfile);

  481.         return err;

  482.     }

  483. 

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

  485.         av_file_unmap(textbuf, textbuf_size);

  486.         return AVERROR(ENOMEM);

  487.     }

  488.     s->text = tmp;

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

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

  491.     av_file_unmap(textbuf, textbuf_size);

  492. 

  493.     return 0;

  494. }

  495. 

  496. static inline int is_newline(uint32_t c)

  497. {

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

  499. }

  500. 

  501. #if CONFIG_LIBFRIBIDI

  502. static int shape_text(AVFilterContext *ctx)

  503. {

  504.     DrawTextContext *s = ctx->priv;

  505.     uint8_t *tmp;

  506.     int ret = AVERROR(ENOMEM);

  507.     static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |

  508.                                       FRIBIDI_FLAGS_ARABIC;

  509.     FriBidiChar *unicodestr = NULL;

  510.     FriBidiStrIndex len;

  511.     FriBidiParType direction = FRIBIDI_PAR_LTR;

  512.     FriBidiStrIndex line_start = 0;

  513.     FriBidiStrIndex line_end = 0;

  514.     FriBidiLevel *embedding_levels = NULL;

  515.     FriBidiArabicProp *ar_props = NULL;

  516.     FriBidiCharType *bidi_types = NULL;

  517.     FriBidiStrIndex i,j;

  518. 

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

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

  521.         goto out;

  522.     }

  523.     len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,

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

  525. 

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

  527.     if (!bidi_types) {

  528.         goto out;

  529.     }

  530. 

  531.     fribidi_get_bidi_types(unicodestr, len, bidi_types);

  532. 

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

  534.     if (!embedding_levels) {

  535.         goto out;

  536.     }

  537. 

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

  539.                                           embedding_levels)) {

  540.         goto out;

  541.     }

  542. 

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

  544.     if (!ar_props) {

  545.         goto out;

  546.     }

  547. 

  548.     fribidi_get_joining_types(unicodestr, len, ar_props);

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

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

  551. 

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

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

  554.             if (!fribidi_reorder_line(flags, bidi_types,

  555.                                       line_end - line_start + 1, line_start,

  556.                                       direction, embedding_levels, unicodestr,

  557.                                       NULL)) {

  558.                 goto out;

  559.             }

  560.             line_start = line_end + 1;

  561.         }

  562.     }

  563. 

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

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

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

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

  568.     len = j;

  569. 

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

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

  572.         goto out;

  573.     }

  574. 

  575.     s->text = tmp;

  576.     len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,

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

  578.     ret = 0;

  579. 

  580. out:

  581.     av_free(unicodestr);

  582.     av_free(embedding_levels);

  583.     av_free(ar_props);

  584.     av_free(bidi_types);

  585.     return ret;

  586. }

  587. #endif

  588. 

  589. static av_cold int init(AVFilterContext *ctx)

  590. {

  591.     int err;

  592.     DrawTextContext *s = ctx->priv;

  593.     Glyph *glyph;

  594. 

  595. #if FF_API_DRAWTEXT_OLD_TIMELINE

  596.     if (s->draw_expr)

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

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

  599. #endif

  600. 

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

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

  603.         return AVERROR(EINVAL);

  604.     }

  605. 

  606.     if (s->textfile) {

  607.         if (s->text) {

  608.             av_log(ctx, AV_LOG_ERROR,

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

  610.             return AVERROR(EINVAL);

  611.         }

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

  613.             return err;

  614.     }

  615. 

  616. #if CONFIG_LIBFRIBIDI

  617.     if (s->text_shaping)

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

  619.             return err;

  620. #endif

  621. 

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

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

  624. 

  625.     if (s->tc_opt_string) {

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

  627.                                                s->tc_opt_string, ctx);

  628.         if (ret < 0)

  629.             return ret;

  630.         if (s->tc24hmax)

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

  632.         if (!s->text)

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

  634.     }

  635. 

  636.     if (!s->text) {

  637.         av_log(ctx, AV_LOG_ERROR,

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

  639.         return AVERROR(EINVAL);

  640.     }

  641. 

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

  643.         av_log(ctx, AV_LOG_ERROR,

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

  645.         return AVERROR(EINVAL);

  646.     }

  647. 

  648.     err = load_font(ctx);

  649.     if (err)

  650.         return err;

  651.     if (!s->fontsize)

  652.         s->fontsize = 16;

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

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

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

  656.         return AVERROR(EINVAL);

  657.     }

  658. 

  659.     if (s->borderw) {

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

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

  662.             return AVERROR_EXTERNAL;

  663.         }

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

  665.                        FT_STROKER_LINEJOIN_ROUND, 0);

  666.     }

  667. 

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

  669. 

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

  671.     load_glyph(ctx, NULL, 0);

  672. 

  673.     /* set the tabsize in pixels */

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

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

  676.         return err;

  677.     }

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

  679. 

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

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

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

  683. 

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

  685. 

  686.     return 0;

  687. }

  688. 

  689. static int query_formats(AVFilterContext *ctx)

  690. {

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

  692.     return 0;

  693. }

  694. 

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

  696. {

  697.     Glyph *glyph = elem;

  698. 

  699.     FT_Done_Glyph(glyph->glyph);

  700.     FT_Done_Glyph(glyph->border_glyph);

  701.     av_free(elem);

  702.     return 0;

  703. }

  704. 

  705. static av_cold void uninit(AVFilterContext *ctx)

  706. {

  707.     DrawTextContext *s = ctx->priv;

  708. 

  709.     av_expr_free(s->x_pexpr);

  710.     av_expr_free(s->y_pexpr);

  711. #if FF_API_DRAWTEXT_OLD_TIMELINE

  712.     av_expr_free(s->draw_pexpr);

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

  714. #endif

  715.     av_freep(&s->positions);

  716.     s->nb_positions = 0;

  717. 

  718. 

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

  720.     av_tree_destroy(s->glyphs);

  721.     s->glyphs = NULL;

  722. 

  723.     FT_Done_Face(s->face);

  724.     FT_Stroker_Done(s->stroker);

  725.     FT_Done_FreeType(s->library);

  726. 

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

  728. }

  729. 

  730. static int config_input(AVFilterLink *inlink)

  731. {

  732.     AVFilterContext *ctx = inlink->dst;

  733.     DrawTextContext *s = ctx->priv;

  734.     int ret;

  735. 

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

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

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

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

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

  741. 

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

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

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

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

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

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

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

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

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

  751. 

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

  753. 

  754.     av_expr_free(s->x_pexpr);

  755.     av_expr_free(s->y_pexpr);

  756. #if FF_API_DRAWTEXT_OLD_TIMELINE

  757.     av_expr_free(s->draw_pexpr);

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

  759. #else

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

  761. #endif

  762. 

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

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

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

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

  767. 

  768.         return AVERROR(EINVAL);

  769. #if FF_API_DRAWTEXT_OLD_TIMELINE

  770.     if (s->draw_expr &&

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

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

  773.         return ret;

  774. #endif

  775. 

  776.     return 0;

  777. }

  778. 

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

  780. {

  781.     DrawTextContext *s = ctx->priv;

  782. 

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

  784.         int ret;

  785.         uninit(ctx);

  786.         s->reinit = 1;

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

  788.             return ret;

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

  790.             return ret;

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

  792.     }

  793. 

  794.     return AVERROR(ENOSYS);

  795. }

  796. 

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

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

  799. {

  800.     DrawTextContext *s = ctx->priv;

  801. 

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

  803.     return 0;

  804. }

  805. 

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

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

  808. {

  809.     DrawTextContext *s = ctx->priv;

  810.     const char *fmt;

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

  812.     int ret;

  813. 

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

  815.     if (argc >= 2) {

  816.         int64_t delta;

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

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

  819.             return ret;

  820.         }

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

  822.     }

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

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

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

  826.         if (isnan(pts)) {

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

  828.         } else {

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

  830.             char sign = ' ';

  831.             if (ms < 0) {

  832.                 sign = '-';

  833.                 ms = -ms;

  834.             }

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

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

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

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

  839.                        (int)ms % 1000);

  840.         }

  841.     } else {

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

  843.         return AVERROR(EINVAL);

  844.     }

  845.     return 0;

  846. }

  847. 

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

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

  850. {

  851.     DrawTextContext *s = ctx->priv;

  852. 

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

  854.     return 0;

  855. }

  856. 

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

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

  859. {

  860.     DrawTextContext *s = ctx->priv;

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

  862. 

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

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

  865.     return 0;

  866. }

  867. 

  868. #if !HAVE_LOCALTIME_R

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

  870. {

  871.     *tm = *localtime(t);

  872. }

  873. #endif

  874. 

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

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

  877. {

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

  879.     time_t now;

  880.     struct tm tm;

  881. 

  882.     time(&now);

  883.     if (tag == 'L')

  884.         localtime_r(&now, &tm);

  885.     else

  886.         tm = *gmtime(&now);

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

  888.     return 0;

  889. }

  890. 

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

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

  893. {

  894.     DrawTextContext *s = ctx->priv;

  895.     double res;

  896.     int ret;

  897. 

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

  899.                                  NULL, NULL, fun2_names, fun2,

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

  901.     if (ret < 0)

  902.         av_log(ctx, AV_LOG_ERROR,

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

  904.                argv[0]);

  905.     else

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

  907. 

  908.     return ret;

  909. }

  910. 

  911. static const struct drawtext_function {

  912.     const char *name;

  913.     unsigned argc_min, argc_max;

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

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

  916. } functions[] = {

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

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

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

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

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

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

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

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

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

  926. };

  927. 

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

  929.                          unsigned argc, char **argv)

  930. {

  931.     unsigned i;

  932. 

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

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

  935.             continue;

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

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

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

  939.             return AVERROR(EINVAL);

  940.         }

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

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

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

  944.             return AVERROR(EINVAL);

  945.         }

  946.         break;

  947.     }

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

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

  950.         return AVERROR(EINVAL);

  951.     }

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

  953. }

  954. 

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

  956. {

  957.     const char *text = *rtext;

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

  959.     unsigned argc = 0, i;

  960.     int ret;

  961. 

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

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

  964.         return AVERROR(EINVAL);

  965.     }

  966.     text++;

  967.     while (1) {

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

  969.             ret = AVERROR(ENOMEM);

  970.             goto end;

  971.         }

  972.         if (!*text) {

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

  974.             ret = AVERROR(EINVAL);

  975.             goto end;

  976.         }

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

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

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

  980.             break;

  981.         text++;

  982.     }

  983. 

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

  985.         goto end;

  986.     ret = 0;

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

  988. 

  989. end:

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

  991.         av_freep(&argv[i]);

  992.     return ret;

  993. }

  994. 

  995. static int expand_text(AVFilterContext *ctx)

  996. {

  997.     DrawTextContext *s = ctx->priv;

  998.     char *text = s->text;

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

  1000.     int ret;

  1001. 

  1002.     av_bprint_clear(bp);

  1003.     while (*text) {

  1004.         if (*text == '\\' && text[1]) {

  1005.             av_bprint_chars(bp, text[1], 1);

  1006.             text += 2;

  1007.         } else if (*text == '%') {

  1008.             text++;

  1009.             if ((ret = expand_function(ctx, bp, &text)) < 0)

  1010.                 return ret;

  1011.         } else {

  1012.             av_bprint_chars(bp, *text, 1);

  1013.             text++;

  1014.         }

  1015.     }

  1016.     if (!av_bprint_is_complete(bp))

  1017.         return AVERROR(ENOMEM);

  1018.     return 0;

  1019. }

  1020. 

  1021. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  1022.                        int width, int height,

  1023.                        FFDrawColor *color, int x, int y, int borderw)

  1024. {

  1025.     char *text = s->expanded_text.str;

  1026.     uint32_t code = 0;

  1027.     int i, x1, y1;

  1028.     uint8_t *p;

  1029.     Glyph *glyph = NULL;

  1030. 

  1031.     for (i = 0, p = text; *p; i++) {

  1032.         FT_Bitmap bitmap;

  1033.         Glyph dummy = { 0 };

  1034.         GET_UTF8(code, *p++, continue;);

  1035. 

  1036.         /* skip new line chars, just go to new line */

  1037.         if (code == '\n' || code == '\r' || code == '\t')

  1038.             continue;

  1039. 

  1040.         dummy.code = code;

  1041.         glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);

  1042. 

  1043.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  1044. 

  1045.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  1046.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  1047.             return AVERROR(EINVAL);

  1048. 

  1049.         x1 = s->positions[i].x+s->x+x - borderw;

  1050.         y1 = s->positions[i].y+s->y+y - borderw;

  1051. 

  1052.         ff_blend_mask(&s->dc, color,

  1053.                       frame->data, frame->linesize, width, height,

  1054.                       bitmap.buffer, bitmap.pitch,

  1055.                       bitmap.width, bitmap.rows,

  1056.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  1057.                       0, x1, y1);

  1058.     }

  1059. 

  1060.     return 0;

  1061. }

  1062. 

  1063. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  1064.                      int width, int height)

  1065. {

  1066.     DrawTextContext *s = ctx->priv;

  1067.     AVFilterLink *inlink = ctx->inputs[0];

  1068. 

  1069.     uint32_t code = 0, prev_code = 0;

  1070.     int x = 0, y = 0, i = 0, ret;

  1071.     int max_text_line_w = 0, len;

  1072.     int box_w, box_h;

  1073.     char *text;

  1074.     uint8_t *p;

  1075.     int y_min = 32000, y_max = -32000;

  1076.     int x_min = 32000, x_max = -32000;

  1077.     FT_Vector delta;

  1078.     Glyph *glyph = NULL, *prev_glyph = NULL;

  1079.     Glyph dummy = { 0 };

  1080. 

  1081.     time_t now = time(0);

  1082.     struct tm ltime;

  1083.     AVBPrint *bp = &s->expanded_text;

  1084. 

  1085.     av_bprint_clear(bp);

  1086. 

  1087.     if(s->basetime != AV_NOPTS_VALUE)

  1088.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;

  1089. 

  1090.     switch (s->exp_mode) {

  1091.     case EXP_NONE:

  1092.         av_bprintf(bp, "%s", s->text);

  1093.         break;

  1094.     case EXP_NORMAL:

  1095.         if ((ret = expand_text(ctx)) < 0)

  1096.             return ret;

  1097.         break;

  1098.     case EXP_STRFTIME:

  1099.         localtime_r(&now, &ltime);

  1100.         av_bprint_strftime(bp, s->text, &ltime);

  1101.         break;

  1102.     }

  1103. 

  1104.     if (s->tc_opt_string) {

  1105.         char tcbuf[AV_TIMECODE_STR_SIZE];

  1106.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);

  1107.         av_bprint_clear(bp);

  1108.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1109.     }

  1110. 

  1111.     if (!av_bprint_is_complete(bp))

  1112.         return AVERROR(ENOMEM);

  1113.     text = s->expanded_text.str;

  1114.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1115.         if (!(s->positions =

  1116.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1117.             return AVERROR(ENOMEM);

  1118.         s->nb_positions = len;

  1119.     }

  1120. 

  1121.     x = 0;

  1122.     y = 0;

  1123. 

  1124.     /* load and cache glyphs */

  1125.     for (i = 0, p = text; *p; i++) {

  1126.         GET_UTF8(code, *p++, continue;);

  1127. 

  1128.         /* get glyph */

  1129.         dummy.code = code;

  1130.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1131.         if (!glyph) {

  1132.             load_glyph(ctx, &glyph, code);

  1133.         }

  1134. 

  1135.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1136.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1137.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1138.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1139.     }

  1140.     s->max_glyph_h = y_max - y_min;

  1141.     s->max_glyph_w = x_max - x_min;

  1142. 

  1143.     /* compute and save position for each glyph */

  1144.     glyph = NULL;

  1145.     for (i = 0, p = text; *p; i++) {

  1146.         GET_UTF8(code, *p++, continue;);

  1147. 

  1148.         /* skip the \n in the sequence \r\n */

  1149.         if (prev_code == '\r' && code == '\n')

  1150.             continue;

  1151. 

  1152.         prev_code = code;

  1153.         if (is_newline(code)) {

  1154. 

  1155.             max_text_line_w = FFMAX(max_text_line_w, x);

  1156.             y += s->max_glyph_h;

  1157.             x = 0;

  1158.             continue;

  1159.         }

  1160. 

  1161.         /* get glyph */

  1162.         prev_glyph = glyph;

  1163.         dummy.code = code;

  1164.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1165. 

  1166.         /* kerning */

  1167.         if (s->use_kerning && prev_glyph && glyph->code) {

  1168.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1169.                            ft_kerning_default, &delta);

  1170.             x += delta.x >> 6;

  1171.         }

  1172. 

  1173.         /* save position */

  1174.         s->positions[i].x = x + glyph->bitmap_left;

  1175.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1176.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1177.         else              x += glyph->advance;

  1178.     }

  1179. 

  1180.     max_text_line_w = FFMAX(x, max_text_line_w);

  1181. 

  1182.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1183.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1184. 

  1185.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1186.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1187.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1188.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1189. 

  1190.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1191. 

  1192.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1193.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1194.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1195. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1196.     if (s->draw_pexpr){

  1197.     s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);

  1198. 

  1199.     if(!s->draw)

  1200.         return 0;

  1201.     }

  1202.     if (ctx->is_disabled)

  1203.         return 0;

  1204. #endif

  1205. 

  1206.     box_w = FFMIN(width - 1 , max_text_line_w);

  1207.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1208. 

  1209.     /* draw box */

  1210.     if (s->draw_box)

  1211.         ff_blend_rectangle(&s->dc, &s->boxcolor,

  1212.                            frame->data, frame->linesize, width, height,

  1213.                            s->x, s->y, box_w, box_h);

  1214. 

  1215.     if (s->shadowx || s->shadowy) {

  1216.         if ((ret = draw_glyphs(s, frame, width, height,

  1217.                                &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1218.             return ret;

  1219.     }

  1220. 

  1221.     if (s->borderw) {

  1222.         if ((ret = draw_glyphs(s, frame, width, height,

  1223.                                &s->bordercolor, 0, 0, s->borderw)) < 0)

  1224.             return ret;

  1225.     }

  1226.     if ((ret = draw_glyphs(s, frame, width, height,

  1227.                            &s->fontcolor, 0, 0, 0)) < 0)

  1228.         return ret;

  1229. 

  1230.     return 0;

  1231. }

  1232. 

  1233. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1234. {

  1235.     AVFilterContext *ctx = inlink->dst;

  1236.     AVFilterLink *outlink = ctx->outputs[0];

  1237.     DrawTextContext *s = ctx->priv;

  1238.     int ret;

  1239. 

  1240.     if (s->reload) {

  1241.         if ((ret = load_textfile(ctx)) < 0)

  1242.             return ret;

  1243. #if CONFIG_LIBFRIBIDI

  1244.         if (s->text_shaping)

  1245.             if ((ret = shape_text(ctx)) < 0)

  1246.                 return ret;

  1247. #endif

  1248.     }

  1249. 

  1250.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;

  1251.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1252.         NAN : frame->pts * av_q2d(inlink->time_base);

  1253. 

  1254.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1255.     s->metadata = av_frame_get_metadata(frame);

  1256. 

  1257.     draw_text(ctx, frame, frame->width, frame->height);

  1258. 

  1259.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1260.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1261.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1262.            s->x, s->y);

  1263. 

  1264.     return ff_filter_frame(outlink, frame);

  1265. }

  1266. 

  1267. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1268.     {

  1269.         .name           = "default",

  1270.         .type           = AVMEDIA_TYPE_VIDEO,

  1271.         .filter_frame   = filter_frame,

  1272.         .config_props   = config_input,

  1273.         .needs_writable = 1,

  1274.     },

  1275.     { NULL }

  1276. };

  1277. 

  1278. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1279.     {

  1280.         .name = "default",

  1281.         .type = AVMEDIA_TYPE_VIDEO,

  1282.     },

  1283.     { NULL }

  1284. };

  1285. 

  1286. AVFilter ff_vf_drawtext = {

  1287.     .name          = "drawtext",

  1288.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1289.     .priv_size     = sizeof(DrawTextContext),

  1290.     .priv_class    = &drawtext_class,

  1291.     .init          = init,

  1292.     .uninit        = uninit,

  1293.     .query_formats = query_formats,

  1294.     .inputs        = avfilter_vf_drawtext_inputs,

  1295.     .outputs       = avfilter_vf_drawtext_outputs,

  1296.     .process_command = command,

  1297. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1298.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

  1299. #else

  1300.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1301. #endif

  1302. };