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FFmpeg/libavfilter/vf_drawtext.c

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  1. /*

  2.  * Copyright (c) 2011 Stefano Sabatini

  3.  * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram

  4.  * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * drawtext filter, based on the original vhook/drawtext.c

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include "config.h"

  30. 

  31. #if HAVE_SYS_TIME_H

  32. #include <sys/time.h>

  33. #endif

  34. #include <sys/types.h>

  35. #include <sys/stat.h>

  36. #include <time.h>

  37. #if HAVE_UNISTD_H

  38. #include <unistd.h>

  39. #endif

  40. #include <fenv.h>

  41. 

  42. #if CONFIG_LIBFONTCONFIG

  43. #include <fontconfig/fontconfig.h>

  44. #endif

  45. 

  46. #include "libavutil/avstring.h"

  47. #include "libavutil/bprint.h"

  48. #include "libavutil/common.h"

  49. #include "libavutil/file.h"

  50. #include "libavutil/eval.h"

  51. #include "libavutil/opt.h"

  52. #include "libavutil/random_seed.h"

  53. #include "libavutil/parseutils.h"

  54. #include "libavutil/timecode.h"

  55. #include "libavutil/time_internal.h"

  56. #include "libavutil/tree.h"

  57. #include "libavutil/lfg.h"

  58. #include "avfilter.h"

  59. #include "drawutils.h"

  60. #include "formats.h"

  61. #include "internal.h"

  62. #include "video.h"

  63. 

  64. #if CONFIG_LIBFRIBIDI

  65. #include <fribidi.h>

  66. #endif

  67. 

  68. #include <ft2build.h>

  69. #include FT_FREETYPE_H

  70. #include FT_GLYPH_H

  71. #include FT_STROKER_H

  72. 

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

  74.     "dar",

  75.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  84.     "sar",

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

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

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

  88.     "x",

  89.     "y",

  90.     "pict_type",

  91.     NULL

  92. };

  93. 

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

  95.     "rand"

  96. };

  97. 

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

  99. {

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

  101. }

  102. 

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

  104. 

  105. static const eval_func2 fun2[] = {

  106.     drand,

  107.     NULL

  108. };

  109. 

  110. enum var_name {

  111.     VAR_DAR,

  112.     VAR_HSUB, VAR_VSUB,

  113.     VAR_LINE_H, VAR_LH,

  114.     VAR_MAIN_H, VAR_h, VAR_H,

  115.     VAR_MAIN_W, VAR_w, VAR_W,

  116.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  117.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  118.     VAR_MAX_GLYPH_H,

  119.     VAR_MAX_GLYPH_W,

  120.     VAR_N,

  121.     VAR_SAR,

  122.     VAR_T,

  123.     VAR_TEXT_H, VAR_TH,

  124.     VAR_TEXT_W, VAR_TW,

  125.     VAR_X,

  126.     VAR_Y,

  127.     VAR_PICT_TYPE,

  128.     VAR_VARS_NB

  129. };

  130. 

  131. enum expansion_mode {

  132.     EXP_NONE,

  133.     EXP_NORMAL,

  134.     EXP_STRFTIME,

  135. };

  136. 

  137. typedef struct DrawTextContext {

  138.     const AVClass *class;

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

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

  141. #if CONFIG_LIBFONTCONFIG

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

  143. #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

  157.     int shadowx, shadowy;

  158.     int borderw;                    ///< border width

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

  160. 

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

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

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

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

  165.     int tabsize;                    ///< tab size

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

  167. 

  168.     FFDrawContext dc;

  169.     FFDrawColor fontcolor;          ///< foreground color

  170.     FFDrawColor shadowcolor;        ///< shadow color

  171.     FFDrawColor bordercolor;        ///< border color

  172.     FFDrawColor boxcolor;           ///< background color

  173. 

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

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

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

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

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

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

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

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

  182.     double var_values[VAR_VARS_NB];

  183.     char   *a_expr;

  184.     AVExpr *a_pexpr;

  185.     int alpha;

  186.     AVLFG  prng;                    ///< random

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

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

  189.     AVTimecode  tc;                 ///< timecode context

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

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

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

  193. #if CONFIG_LIBFRIBIDI

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

  195. #endif

  196.     AVDictionary *metadata;

  197. } DrawTextContext;

  198. 

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

  200. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  201. 

  202. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  222. #if CONFIG_LIBFONTCONFIG

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

  224. #endif

  225. 

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

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

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

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

  230. 

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

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

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

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

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

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

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

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

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

  240. 

  241. #if CONFIG_LIBFRIBIDI

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

  243. #endif

  244. 

  245.     /* FT_LOAD_* flags */

  246.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  262.     { NULL }

  263. };

  264. 

  265. AVFILTER_DEFINE_CLASS(drawtext);

  266. 

  267. #undef __FTERRORS_H__

  268. #define FT_ERROR_START_LIST {

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

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

  271. 

  272. static const struct ft_error {

  273.     int err;

  274.     const char *err_msg;

  275. } ft_errors[] =

  276. #include FT_ERRORS_H

  277. 

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

  279. 

  280. typedef struct Glyph {

  281.     FT_Glyph glyph;

  282.     FT_Glyph border_glyph;

  283.     uint32_t code;

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

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

  286.     FT_BBox bbox;

  287.     int advance;

  288.     int bitmap_left;

  289.     int bitmap_top;

  290. } Glyph;

  291. 

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

  293. {

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

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

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

  297. }

  298. 

  299. /**

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

  301.  */

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

  303. {

  304.     DrawTextContext *s = ctx->priv;

  305.     FT_BitmapGlyph bitmapglyph;

  306.     Glyph *glyph;

  307.     struct AVTreeNode *node = NULL;

  308.     int ret;

  309. 

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

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

  312.         return AVERROR(EINVAL);

  313. 

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

  315.     if (!glyph) {

  316.         ret = AVERROR(ENOMEM);

  317.         goto error;

  318.     }

  319.     glyph->code  = code;

  320. 

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

  322.         ret = AVERROR(EINVAL);

  323.         goto error;

  324.     }

  325.     if (s->borderw) {

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

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

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

  329.             ret = AVERROR_EXTERNAL;

  330.             goto error;

  331.         }

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

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

  334.     }

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

  336.         ret = AVERROR_EXTERNAL;

  337.         goto error;

  338.     }

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

  340. 

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

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

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

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

  345. 

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

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

  348. 

  349.     /* cache the newly created glyph */

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

  351.         ret = AVERROR(ENOMEM);

  352.         goto error;

  353.     }

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

  355. 

  356.     if (glyph_ptr)

  357.         *glyph_ptr = glyph;

  358.     return 0;

  359. 

  360. error:

  361.     if (glyph)

  362.         av_freep(&glyph->glyph);

  363. 

  364.     av_freep(&glyph);

  365.     av_freep(&node);

  366.     return ret;

  367. }

  368. 

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

  370. {

  371.     DrawTextContext *s = ctx->priv;

  372.     int err;

  373. 

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

  375.     if (err) {

  376. #if !CONFIG_LIBFONTCONFIG

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

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

  379. #endif

  380.         return AVERROR(EINVAL);

  381.     }

  382.     return 0;

  383. }

  384. 

  385. #if CONFIG_LIBFONTCONFIG

  386. static int load_font_fontconfig(AVFilterContext *ctx)

  387. {

  388.     DrawTextContext *s = ctx->priv;

  389.     FcConfig *fontconfig;

  390.     FcPattern *pat, *best;

  391.     FcResult result = FcResultMatch;

  392.     FcChar8 *filename;

  393.     int index;

  394.     double size;

  395.     int err = AVERROR(ENOENT);

  396. 

  397.     fontconfig = FcInitLoadConfigAndFonts();

  398.     if (!fontconfig) {

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

  400.         return AVERROR_UNKNOWN;

  401.     }

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

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

  404.     if (!pat) {

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

  406.         return AVERROR(EINVAL);

  407.     }

  408. 

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

  410.     if (s->fontsize)

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

  412. 

  413.     FcDefaultSubstitute(pat);

  414. 

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

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

  417.         FcPatternDestroy(pat);

  418.         return AVERROR(ENOMEM);

  419.     }

  420. 

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

  422.     FcPatternDestroy(pat);

  423. 

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

  425.         av_log(ctx, AV_LOG_ERROR,

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

  427.                s->font);

  428.         goto fail;

  429.     }

  430. 

  431.     if (

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

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

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

  435.         return AVERROR(EINVAL);

  436.     }

  437. 

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

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

  440.                s->font);

  441.         goto fail;

  442.     }

  443. 

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

  445.     if (!s->fontsize)

  446.         s->fontsize = size + 0.5;

  447. 

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

  449.     if (err)

  450.         return err;

  451.     FcConfigDestroy(fontconfig);

  452. fail:

  453.     FcPatternDestroy(best);

  454.     return err;

  455. }

  456. #endif

  457. 

  458. static int load_font(AVFilterContext *ctx)

  459. {

  460.     DrawTextContext *s = ctx->priv;

  461.     int err;

  462. 

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

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

  465.     if (!err)

  466.         return 0;

  467. #if CONFIG_LIBFONTCONFIG

  468.     err = load_font_fontconfig(ctx);

  469.     if (!err)

  470.         return 0;

  471. #endif

  472.     return err;

  473. }

  474. 

  475. static int load_textfile(AVFilterContext *ctx)

  476. {

  477.     DrawTextContext *s = ctx->priv;

  478.     int err;

  479.     uint8_t *textbuf;

  480.     uint8_t *tmp;

  481.     size_t textbuf_size;

  482. 

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

  484.         av_log(ctx, AV_LOG_ERROR,

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

  486.                s->textfile);

  487.         return err;

  488.     }

  489. 

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

  491.         av_file_unmap(textbuf, textbuf_size);

  492.         return AVERROR(ENOMEM);

  493.     }

  494.     s->text = tmp;

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

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

  497.     av_file_unmap(textbuf, textbuf_size);

  498. 

  499.     return 0;

  500. }

  501. 

  502. static inline int is_newline(uint32_t c)

  503. {

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

  505. }

  506. 

  507. #if CONFIG_LIBFRIBIDI

  508. static int shape_text(AVFilterContext *ctx)

  509. {

  510.     DrawTextContext *s = ctx->priv;

  511.     uint8_t *tmp;

  512.     int ret = AVERROR(ENOMEM);

  513.     static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |

  514.                                       FRIBIDI_FLAGS_ARABIC;

  515.     FriBidiChar *unicodestr = NULL;

  516.     FriBidiStrIndex len;

  517.     FriBidiParType direction = FRIBIDI_PAR_LTR;

  518.     FriBidiStrIndex line_start = 0;

  519.     FriBidiStrIndex line_end = 0;

  520.     FriBidiLevel *embedding_levels = NULL;

  521.     FriBidiArabicProp *ar_props = NULL;

  522.     FriBidiCharType *bidi_types = NULL;

  523.     FriBidiStrIndex i,j;

  524. 

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

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

  527.         goto out;

  528.     }

  529.     len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,

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

  531. 

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

  533.     if (!bidi_types) {

  534.         goto out;

  535.     }

  536. 

  537.     fribidi_get_bidi_types(unicodestr, len, bidi_types);

  538. 

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

  540.     if (!embedding_levels) {

  541.         goto out;

  542.     }

  543. 

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

  545.                                           embedding_levels)) {

  546.         goto out;

  547.     }

  548. 

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

  550.     if (!ar_props) {

  551.         goto out;

  552.     }

  553. 

  554.     fribidi_get_joining_types(unicodestr, len, ar_props);

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

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

  557. 

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

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

  560.             if (!fribidi_reorder_line(flags, bidi_types,

  561.                                       line_end - line_start + 1, line_start,

  562.                                       direction, embedding_levels, unicodestr,

  563.                                       NULL)) {

  564.                 goto out;

  565.             }

  566.             line_start = line_end + 1;

  567.         }

  568.     }

  569. 

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

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

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

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

  574.     len = j;

  575. 

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

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

  578.         goto out;

  579.     }

  580. 

  581.     s->text = tmp;

  582.     len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,

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

  584.     ret = 0;

  585. 

  586. out:

  587.     av_free(unicodestr);

  588.     av_free(embedding_levels);

  589.     av_free(ar_props);

  590.     av_free(bidi_types);

  591.     return ret;

  592. }

  593. #endif

  594. 

  595. static av_cold int init(AVFilterContext *ctx)

  596. {

  597.     int err;

  598.     DrawTextContext *s = ctx->priv;

  599.     Glyph *glyph;

  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 (s->reload && !s->textfile)

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

  618. 

  619.     if (s->tc_opt_string) {

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

  621.                                                s->tc_opt_string, ctx);

  622.         if (ret < 0)

  623.             return ret;

  624.         if (s->tc24hmax)

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

  626.         if (!s->text)

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

  628.     }

  629. 

  630.     if (!s->text) {

  631.         av_log(ctx, AV_LOG_ERROR,

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

  633.         return AVERROR(EINVAL);

  634.     }

  635. 

  636. #if CONFIG_LIBFRIBIDI

  637.     if (s->text_shaping)

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

  639.             return err;

  640. #endif

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

  686. 

  687.     return 0;

  688. }

  689. 

  690. static int query_formats(AVFilterContext *ctx)

  691. {

  692.     return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(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.     av_expr_free(s->a_pexpr);

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

  713.     av_freep(&s->positions);

  714.     s->nb_positions = 0;

  715. 

  716. 

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

  718.     av_tree_destroy(s->glyphs);

  719.     s->glyphs = NULL;

  720. 

  721.     FT_Done_Face(s->face);

  722.     FT_Stroker_Done(s->stroker);

  723.     FT_Done_FreeType(s->library);

  724. 

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

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

  727. }

  728. 

  729. static int config_input(AVFilterLink *inlink)

  730. {

  731.     AVFilterContext *ctx = inlink->dst;

  732.     DrawTextContext *s = ctx->priv;

  733.     int ret;

  734. 

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

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

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

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

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

  740. 

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

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

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

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

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

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

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

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

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

  750. 

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

  752. 

  753.     av_expr_free(s->x_pexpr);

  754.     av_expr_free(s->y_pexpr);

  755.     av_expr_free(s->a_pexpr);

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

  757. 

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

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

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

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

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

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

  764. 

  765.         return AVERROR(EINVAL);

  766. 

  767.     return 0;

  768. }

  769. 

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

  771. {

  772.     DrawTextContext *s = ctx->priv;

  773. 

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

  775.         int ret;

  776.         uninit(ctx);

  777.         s->reinit = 1;

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

  779.             return ret;

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

  781.             return ret;

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

  783.     }

  784. 

  785.     return AVERROR(ENOSYS);

  786. }

  787. 

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

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

  790. {

  791.     DrawTextContext *s = ctx->priv;

  792. 

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

  794.     return 0;

  795. }

  796. 

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

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

  799. {

  800.     DrawTextContext *s = ctx->priv;

  801.     const char *fmt;

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

  803.     int ret;

  804. 

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

  806.     if (argc >= 2) {

  807.         int64_t delta;

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

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

  810.             return ret;

  811.         }

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

  813.     }

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

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

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

  817.         if (isnan(pts)) {

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

  819.         } else {

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

  821.             char sign = ' ';

  822.             if (ms < 0) {

  823.                 sign = '-';

  824.                 ms = -ms;

  825.             }

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

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

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

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

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

  831.         }

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

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

  834.         struct tm tm;

  835.         time_t ms = (time_t)pts;

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

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

  838.             localtime_r(&ms, &tm);

  839.         else

  840.             gmtime_r(&ms, &tm);

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

  842.     } else {

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

  844.         return AVERROR(EINVAL);

  845.     }

  846.     return 0;

  847. }

  848. 

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

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

  851. {

  852.     DrawTextContext *s = ctx->priv;

  853. 

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

  855.     return 0;

  856. }

  857. 

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

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

  860. {

  861.     DrawTextContext *s = ctx->priv;

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

  863. 

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

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

  866.     else if (argc >= 2)

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

  868.     return 0;

  869. }

  870. 

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

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

  873. {

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

  875.     time_t now;

  876.     struct tm tm;

  877. 

  878.     time(&now);

  879.     if (tag == 'L')

  880.         localtime_r(&now, &tm);

  881.     else

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

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

  884.     return 0;

  885. }

  886. 

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

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

  889. {

  890.     DrawTextContext *s = ctx->priv;

  891.     double res;

  892.     int ret;

  893. 

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

  895.                                  NULL, NULL, fun2_names, fun2,

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

  897.     if (ret < 0)

  898.         av_log(ctx, AV_LOG_ERROR,

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

  900.                argv[0]);

  901.     else

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

  903. 

  904.     return ret;

  905. }

  906. 

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

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

  909. {

  910.     DrawTextContext *s = ctx->priv;

  911.     double res;

  912.     int intval;

  913.     int ret;

  914.     unsigned int positions = 0;

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

  916. 

  917.     /*

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

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

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

  921.      */

  922. 

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

  924.                                  NULL, NULL, fun2_names, fun2,

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

  926.     if (ret < 0) {

  927.         av_log(ctx, AV_LOG_ERROR,

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

  929.                argv[0]);

  930.         return ret;

  931.     }

  932. 

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

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

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

  936.         return AVERROR(EINVAL);

  937.     }

  938. 

  939.     if (argc == 3) {

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

  941.         if (ret != 1) {

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

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

  944.             return AVERROR(EINVAL);

  945.         }

  946.     }

  947. 

  948.     feclearexcept(FE_ALL_EXCEPT);

  949.     intval = res;

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

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

  952.         return AVERROR(EINVAL);

  953.     }

  954. 

  955.     if (argc == 3)

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

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

  958. 

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

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

  961. 

  962.     av_bprintf(bp, fmt_str, intval);

  963. 

  964.     return 0;

  965. }

  966. 

  967. static const struct drawtext_function {

  968.     const char *name;

  969.     unsigned argc_min, argc_max;

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

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

  972. } functions[] = {

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

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

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

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

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

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

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

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

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

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

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

  984. };

  985. 

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

  987.                          unsigned argc, char **argv)

  988. {

  989.     unsigned i;

  990. 

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

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

  993.             continue;

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

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

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

  997.             return AVERROR(EINVAL);

  998.         }

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

  1000.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",

  1001.                    fct, functions[i].argc_max);

  1002.             return AVERROR(EINVAL);

  1003.         }

  1004.         break;

  1005.     }

  1006.     if (i >= FF_ARRAY_ELEMS(functions)) {

  1007.         av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);

  1008.         return AVERROR(EINVAL);

  1009.     }

  1010.     return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);

  1011. }

  1012. 

  1013. static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)

  1014. {

  1015.     const char *text = *rtext;

  1016.     char *argv[16] = { NULL };

  1017.     unsigned argc = 0, i;

  1018.     int ret;

  1019. 

  1020.     if (*text != '{') {

  1021.         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);

  1022.         return AVERROR(EINVAL);

  1023.     }

  1024.     text++;

  1025.     while (1) {

  1026.         if (!(argv[argc++] = av_get_token(&text, ":}"))) {

  1027.             ret = AVERROR(ENOMEM);

  1028.             goto end;

  1029.         }

  1030.         if (!*text) {

  1031.             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);

  1032.             ret = AVERROR(EINVAL);

  1033.             goto end;

  1034.         }

  1035.         if (argc == FF_ARRAY_ELEMS(argv))

  1036.             av_freep(&argv[--argc]); /* error will be caught later */

  1037.         if (*text == '}')

  1038.             break;

  1039.         text++;

  1040.     }

  1041. 

  1042.     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)

  1043.         goto end;

  1044.     ret = 0;

  1045.     *rtext = (char *)text + 1;

  1046. 

  1047. end:

  1048.     for (i = 0; i < argc; i++)

  1049.         av_freep(&argv[i]);

  1050.     return ret;

  1051. }

  1052. 

  1053. static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)

  1054. {

  1055.     int ret;

  1056. 

  1057.     av_bprint_clear(bp);

  1058.     while (*text) {

  1059.         if (*text == '\\' && text[1]) {

  1060.             av_bprint_chars(bp, text[1], 1);

  1061.             text += 2;

  1062.         } else if (*text == '%') {

  1063.             text++;

  1064.             if ((ret = expand_function(ctx, bp, &text)) < 0)

  1065.                 return ret;

  1066.         } else {

  1067.             av_bprint_chars(bp, *text, 1);

  1068.             text++;

  1069.         }

  1070.     }

  1071.     if (!av_bprint_is_complete(bp))

  1072.         return AVERROR(ENOMEM);

  1073.     return 0;

  1074. }

  1075. 

  1076. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  1077.                        int width, int height,

  1078.                        FFDrawColor *color,

  1079.                        int x, int y, int borderw)

  1080. {

  1081.     char *text = s->expanded_text.str;

  1082.     uint32_t code = 0;

  1083.     int i, x1, y1;

  1084.     uint8_t *p;

  1085.     Glyph *glyph = NULL;

  1086. 

  1087.     for (i = 0, p = text; *p; i++) {

  1088.         FT_Bitmap bitmap;

  1089.         Glyph dummy = { 0 };

  1090.         GET_UTF8(code, *p++, continue;);

  1091. 

  1092.         /* skip new line chars, just go to new line */

  1093.         if (code == '\n' || code == '\r' || code == '\t')

  1094.             continue;

  1095. 

  1096.         dummy.code = code;

  1097.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1098. 

  1099.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  1100. 

  1101.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  1102.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  1103.             return AVERROR(EINVAL);

  1104. 

  1105.         x1 = s->positions[i].x+s->x+x - borderw;

  1106.         y1 = s->positions[i].y+s->y+y - borderw;

  1107. 

  1108.         ff_blend_mask(&s->dc, color,

  1109.                       frame->data, frame->linesize, width, height,

  1110.                       bitmap.buffer, bitmap.pitch,

  1111.                       bitmap.width, bitmap.rows,

  1112.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  1113.                       0, x1, y1);

  1114.     }

  1115. 

  1116.     return 0;

  1117. }

  1118. 

  1119. 

  1120. static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)

  1121. {

  1122.     *color = incolor;

  1123.     color->rgba[3] = (color->rgba[3] * s->alpha) / 255;

  1124.     ff_draw_color(&s->dc, color, color->rgba);

  1125. }

  1126. 

  1127. static void update_alpha(DrawTextContext *s)

  1128. {

  1129.     double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);

  1130. 

  1131.     if (isnan(alpha))

  1132.         return;

  1133. 

  1134.     if (alpha >= 1.0)

  1135.         s->alpha = 255;

  1136.     else if (alpha <= 0)

  1137.         s->alpha = 0;

  1138.     else

  1139.         s->alpha = 256 * alpha;

  1140. }

  1141. 

  1142. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  1143.                      int width, int height)

  1144. {

  1145.     DrawTextContext *s = ctx->priv;

  1146.     AVFilterLink *inlink = ctx->inputs[0];

  1147. 

  1148.     uint32_t code = 0, prev_code = 0;

  1149.     int x = 0, y = 0, i = 0, ret;

  1150.     int max_text_line_w = 0, len;

  1151.     int box_w, box_h;

  1152.     char *text;

  1153.     uint8_t *p;

  1154.     int y_min = 32000, y_max = -32000;

  1155.     int x_min = 32000, x_max = -32000;

  1156.     FT_Vector delta;

  1157.     Glyph *glyph = NULL, *prev_glyph = NULL;

  1158.     Glyph dummy = { 0 };

  1159. 

  1160.     time_t now = time(0);

  1161.     struct tm ltime;

  1162.     AVBPrint *bp = &s->expanded_text;

  1163. 

  1164.     FFDrawColor fontcolor;

  1165.     FFDrawColor shadowcolor;

  1166.     FFDrawColor bordercolor;

  1167.     FFDrawColor boxcolor;

  1168. 

  1169.     av_bprint_clear(bp);

  1170. 

  1171.     if(s->basetime != AV_NOPTS_VALUE)

  1172.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;

  1173. 

  1174.     switch (s->exp_mode) {

  1175.     case EXP_NONE:

  1176.         av_bprintf(bp, "%s", s->text);

  1177.         break;

  1178.     case EXP_NORMAL:

  1179.         if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)

  1180.             return ret;

  1181.         break;

  1182.     case EXP_STRFTIME:

  1183.         localtime_r(&now, &ltime);

  1184.         av_bprint_strftime(bp, s->text, &ltime);

  1185.         break;

  1186.     }

  1187. 

  1188.     if (s->tc_opt_string) {

  1189.         char tcbuf[AV_TIMECODE_STR_SIZE];

  1190.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out);

  1191.         av_bprint_clear(bp);

  1192.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1193.     }

  1194. 

  1195.     if (!av_bprint_is_complete(bp))

  1196.         return AVERROR(ENOMEM);

  1197.     text = s->expanded_text.str;

  1198.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1199.         if (!(s->positions =

  1200.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1201.             return AVERROR(ENOMEM);

  1202.         s->nb_positions = len;

  1203.     }

  1204. 

  1205.     if (s->fontcolor_expr[0]) {

  1206.         /* If expression is set, evaluate and replace the static value */

  1207.         av_bprint_clear(&s->expanded_fontcolor);

  1208.         if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)

  1209.             return ret;

  1210.         if (!av_bprint_is_complete(&s->expanded_fontcolor))

  1211.             return AVERROR(ENOMEM);

  1212.         av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);

  1213.         ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);

  1214.         if (ret)

  1215.             return ret;

  1216.         ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);

  1217.     }

  1218. 

  1219.     x = 0;

  1220.     y = 0;

  1221. 

  1222.     /* load and cache glyphs */

  1223.     for (i = 0, p = text; *p; i++) {

  1224.         GET_UTF8(code, *p++, continue;);

  1225. 

  1226.         /* get glyph */

  1227.         dummy.code = code;

  1228.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1229.         if (!glyph) {

  1230.             ret = load_glyph(ctx, &glyph, code);

  1231.             if (ret < 0)

  1232.                 return ret;

  1233.         }

  1234. 

  1235.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1236.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1237.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1238.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1239.     }

  1240.     s->max_glyph_h = y_max - y_min;

  1241.     s->max_glyph_w = x_max - x_min;

  1242. 

  1243.     /* compute and save position for each glyph */

  1244.     glyph = NULL;

  1245.     for (i = 0, p = text; *p; i++) {

  1246.         GET_UTF8(code, *p++, continue;);

  1247. 

  1248.         /* skip the \n in the sequence \r\n */

  1249.         if (prev_code == '\r' && code == '\n')

  1250.             continue;

  1251. 

  1252.         prev_code = code;

  1253.         if (is_newline(code)) {

  1254. 

  1255.             max_text_line_w = FFMAX(max_text_line_w, x);

  1256.             y += s->max_glyph_h + s->line_spacing;

  1257.             x = 0;

  1258.             continue;

  1259.         }

  1260. 

  1261.         /* get glyph */

  1262.         prev_glyph = glyph;

  1263.         dummy.code = code;

  1264.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1265. 

  1266.         /* kerning */

  1267.         if (s->use_kerning && prev_glyph && glyph->code) {

  1268.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1269.                            ft_kerning_default, &delta);

  1270.             x += delta.x >> 6;

  1271.         }

  1272. 

  1273.         /* save position */

  1274.         s->positions[i].x = x + glyph->bitmap_left;

  1275.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1276.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1277.         else              x += glyph->advance;

  1278.     }

  1279. 

  1280.     max_text_line_w = FFMAX(x, max_text_line_w);

  1281. 

  1282.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1283.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1284. 

  1285.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1286.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1287.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1288.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1289. 

  1290.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1291. 

  1292.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1293.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1294.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1295. 

  1296.     update_alpha(s);

  1297.     update_color_with_alpha(s, &fontcolor  , s->fontcolor  );

  1298.     update_color_with_alpha(s, &shadowcolor, s->shadowcolor);

  1299.     update_color_with_alpha(s, &bordercolor, s->bordercolor);

  1300.     update_color_with_alpha(s, &boxcolor   , s->boxcolor   );

  1301. 

  1302.     box_w = FFMIN(width - 1 , max_text_line_w);

  1303.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1304. 

  1305.     /* draw box */

  1306.     if (s->draw_box)

  1307.         ff_blend_rectangle(&s->dc, &boxcolor,

  1308.                            frame->data, frame->linesize, width, height,

  1309.                            s->x - s->boxborderw, s->y - s->boxborderw,

  1310.                            box_w + s->boxborderw * 2, box_h + s->boxborderw * 2);

  1311. 

  1312.     if (s->shadowx || s->shadowy) {

  1313.         if ((ret = draw_glyphs(s, frame, width, height,

  1314.                                &shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1315.             return ret;

  1316.     }

  1317. 

  1318.     if (s->borderw) {

  1319.         if ((ret = draw_glyphs(s, frame, width, height,

  1320.                                &bordercolor, 0, 0, s->borderw)) < 0)

  1321.             return ret;

  1322.     }

  1323.     if ((ret = draw_glyphs(s, frame, width, height,

  1324.                            &fontcolor, 0, 0, 0)) < 0)

  1325.         return ret;

  1326. 

  1327.     return 0;

  1328. }

  1329. 

  1330. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1331. {

  1332.     AVFilterContext *ctx = inlink->dst;

  1333.     AVFilterLink *outlink = ctx->outputs[0];

  1334.     DrawTextContext *s = ctx->priv;

  1335.     int ret;

  1336. 

  1337.     if (s->reload) {

  1338.         if ((ret = load_textfile(ctx)) < 0) {

  1339.             av_frame_free(&frame);

  1340.             return ret;

  1341.         }

  1342. #if CONFIG_LIBFRIBIDI

  1343.         if (s->text_shaping)

  1344.             if ((ret = shape_text(ctx)) < 0) {

  1345.                 av_frame_free(&frame);

  1346.                 return ret;

  1347.             }

  1348. #endif

  1349.     }

  1350. 

  1351.     s->var_values[VAR_N] = inlink->frame_count_out + s->start_number;

  1352.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1353.         NAN : frame->pts * av_q2d(inlink->time_base);

  1354. 

  1355.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1356.     s->metadata = av_frame_get_metadata(frame);

  1357. 

  1358.     draw_text(ctx, frame, frame->width, frame->height);

  1359. 

  1360.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1361.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1362.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1363.            s->x, s->y);

  1364. 

  1365.     return ff_filter_frame(outlink, frame);

  1366. }

  1367. 

  1368. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1369.     {

  1370.         .name           = "default",

  1371.         .type           = AVMEDIA_TYPE_VIDEO,

  1372.         .filter_frame   = filter_frame,

  1373.         .config_props   = config_input,

  1374.         .needs_writable = 1,

  1375.     },

  1376.     { NULL }

  1377. };

  1378. 

  1379. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1380.     {

  1381.         .name = "default",

  1382.         .type = AVMEDIA_TYPE_VIDEO,

  1383.     },

  1384.     { NULL }

  1385. };

  1386. 

  1387. AVFilter ff_vf_drawtext = {

  1388.     .name          = "drawtext",

  1389.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1390.     .priv_size     = sizeof(DrawTextContext),

  1391.     .priv_class    = &drawtext_class,

  1392.     .init          = init,

  1393.     .uninit        = uninit,

  1394.     .query_formats = query_formats,

  1395.     .inputs        = avfilter_vf_drawtext_inputs,

  1396.     .outputs       = avfilter_vf_drawtext_outputs,

  1397.     .process_command = command,

  1398.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1399. };