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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.     "pkt_pos",

  92.     "pkt_duration",

  93.     "pkt_size",

  94.     NULL

  95. };

  96. 

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

  98.     "rand"

  99. };

  100. 

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

  102. {

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

  104. }

  105. 

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

  107. 

  108. static const eval_func2 fun2[] = {

  109.     drand,

  110.     NULL

  111. };

  112. 

  113. enum var_name {

  114.     VAR_DAR,

  115.     VAR_HSUB, VAR_VSUB,

  116.     VAR_LINE_H, VAR_LH,

  117.     VAR_MAIN_H, VAR_h, VAR_H,

  118.     VAR_MAIN_W, VAR_w, VAR_W,

  119.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  120.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  121.     VAR_MAX_GLYPH_H,

  122.     VAR_MAX_GLYPH_W,

  123.     VAR_N,

  124.     VAR_SAR,

  125.     VAR_T,

  126.     VAR_TEXT_H, VAR_TH,

  127.     VAR_TEXT_W, VAR_TW,

  128.     VAR_X,

  129.     VAR_Y,

  130.     VAR_PICT_TYPE,

  131.     VAR_PKT_POS,

  132.     VAR_PKT_DURATION,

  133.     VAR_PKT_SIZE,

  134.     VAR_VARS_NB

  135. };

  136. 

  137. enum expansion_mode {

  138.     EXP_NONE,

  139.     EXP_NORMAL,

  140.     EXP_STRFTIME,

  141. };

  142. 

  143. typedef struct DrawTextContext {

  144.     const AVClass *class;

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

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

  147. #if CONFIG_LIBFONTCONFIG

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

  149. #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

  163.     int shadowx, shadowy;

  164.     int borderw;                    ///< border width

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

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

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

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

  169. 

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

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

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

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

  174.     int tabsize;                    ///< tab size

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

  176. 

  177.     FFDrawContext dc;

  178.     FFDrawColor fontcolor;          ///< foreground color

  179.     FFDrawColor shadowcolor;        ///< shadow color

  180.     FFDrawColor bordercolor;        ///< border color

  181.     FFDrawColor boxcolor;           ///< background color

  182. 

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

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

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

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

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

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

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

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

  191.     double var_values[VAR_VARS_NB];

  192.     char   *a_expr;

  193.     AVExpr *a_pexpr;

  194.     int alpha;

  195.     AVLFG  prng;                    ///< random

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

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

  198.     AVTimecode  tc;                 ///< timecode context

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

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

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

  202. #if CONFIG_LIBFRIBIDI

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

  204. #endif

  205.     AVDictionary *metadata;

  206. } DrawTextContext;

  207. 

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

  209. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  210. 

  211. static const AVOption drawtext_options[]= {

  212.     {"fontfile",    "set font file",        OFFSET(fontfile),           AV_OPT_TYPE_STRING, {.str=NULL},  0, 0, FLAGS},

  213.     {"text",        "set text",             OFFSET(text),               AV_OPT_TYPE_STRING, {.str=NULL},  0, 0, FLAGS},

  214.     {"textfile",    "set text file",        OFFSET(textfile),           AV_OPT_TYPE_STRING, {.str=NULL},  0, 0, FLAGS},

  215.     {"fontcolor",   "set foreground color", OFFSET(fontcolor.rgba),     AV_OPT_TYPE_COLOR,  {.str="black"}, 0, 0, FLAGS},

  216.     {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, 0, 0, FLAGS},

  217.     {"boxcolor",    "set box color",        OFFSET(boxcolor.rgba),      AV_OPT_TYPE_COLOR,  {.str="white"}, 0, 0, FLAGS},

  218.     {"bordercolor", "set border color",     OFFSET(bordercolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, 0, 0, FLAGS},

  219.     {"shadowcolor", "set shadow color",     OFFSET(shadowcolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, 0, 0, FLAGS},

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

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

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

  223.     {"fontsize",    "set font size",        OFFSET(fontsize_expr),      AV_OPT_TYPE_STRING, {.str=NULL},  0, 0 , FLAGS},

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

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

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

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

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

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

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

  231. #if CONFIG_LIBFONTCONFIG

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

  233. #endif

  234. 

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

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

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

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

  239. 

  240.     {"timecode",        "set initial timecode",             OFFSET(tc_opt_string), AV_OPT_TYPE_STRING,   {.str=NULL}, 0, 0, FLAGS},

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

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

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

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

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

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

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

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

  249. 

  250. #if CONFIG_LIBFRIBIDI

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

  252. #endif

  253. 

  254.     /* FT_LOAD_* flags */

  255.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  271.     { NULL }

  272. };

  273. 

  274. AVFILTER_DEFINE_CLASS(drawtext);

  275. 

  276. #undef __FTERRORS_H__

  277. #define FT_ERROR_START_LIST {

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

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

  280. 

  281. static const struct ft_error {

  282.     int err;

  283.     const char *err_msg;

  284. } ft_errors[] =

  285. #include FT_ERRORS_H

  286. 

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

  288. 

  289. typedef struct Glyph {

  290.     FT_Glyph glyph;

  291.     FT_Glyph border_glyph;

  292.     uint32_t code;

  293.     unsigned int fontsize;

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

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

  296.     FT_BBox bbox;

  297.     int advance;

  298.     int bitmap_left;

  299.     int bitmap_top;

  300. } Glyph;

  301. 

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

  303. {

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

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

  306. 

  307.     if (diff != 0)

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

  309.     else

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

  311. }

  312. 

  313. /**

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

  315.  */

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

  317. {

  318.     DrawTextContext *s = ctx->priv;

  319.     FT_BitmapGlyph bitmapglyph;

  320.     Glyph *glyph;

  321.     struct AVTreeNode *node = NULL;

  322.     int ret;

  323. 

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

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

  326.         return AVERROR(EINVAL);

  327. 

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

  329.     if (!glyph) {

  330.         ret = AVERROR(ENOMEM);

  331.         goto error;

  332.     }

  333.     glyph->code  = code;

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

  335. 

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

  337.         ret = AVERROR(EINVAL);

  338.         goto error;

  339.     }

  340.     if (s->borderw) {

  341.         glyph->border_glyph = glyph->glyph;

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

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

  344.             ret = AVERROR_EXTERNAL;

  345.             goto error;

  346.         }

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

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

  349.     }

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

  351.         ret = AVERROR_EXTERNAL;

  352.         goto error;

  353.     }

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

  355. 

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

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

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

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

  360. 

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

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

  363. 

  364.     /* cache the newly created glyph */

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

  366.         ret = AVERROR(ENOMEM);

  367.         goto error;

  368.     }

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

  370. 

  371.     if (glyph_ptr)

  372.         *glyph_ptr = glyph;

  373.     return 0;

  374. 

  375. error:

  376.     if (glyph)

  377.         av_freep(&glyph->glyph);

  378. 

  379.     av_freep(&glyph);

  380.     av_freep(&node);

  381.     return ret;

  382. }

  383. 

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

  385. {

  386.     int err;

  387.     DrawTextContext *s = ctx->priv;

  388. 

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

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

  391.                fontsize, FT_ERRMSG(err));

  392.         return AVERROR(EINVAL);

  393.     }

  394. 

  395.     s->fontsize = fontsize;

  396. 

  397.     return 0;

  398. }

  399. 

  400. static av_cold int parse_fontsize(AVFilterContext *ctx)

  401. {

  402.     DrawTextContext *s = ctx->priv;

  403.     int err;

  404. 

  405.     if (s->fontsize_pexpr)

  406.         return 0;

  407. 

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

  409.         return AVERROR(EINVAL);

  410. 

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

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

  413.         return err;

  414. 

  415.     return 0;

  416. }

  417. 

  418. static av_cold int update_fontsize(AVFilterContext *ctx)

  419. {

  420.     DrawTextContext *s = ctx->priv;

  421.     unsigned int fontsize = s->default_fontsize;

  422.     int err;

  423.     double size, roundedsize;

  424. 

  425.     // if no fontsize specified use the default

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

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

  428.            return err;

  429. 

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

  431. 

  432.         if (!isnan(size)) {

  433.             roundedsize = round(size);

  434.             // test for overflow before cast

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

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

  437.                 return AVERROR(EINVAL);

  438.             }

  439. 

  440.             fontsize = roundedsize;

  441.         }

  442.     }

  443. 

  444.     if (fontsize == 0)

  445.         fontsize = 1;

  446. 

  447.     // no change

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

  449.         return 0;

  450. 

  451.     return set_fontsize(ctx, fontsize);

  452. }

  453. 

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

  455. {

  456.     DrawTextContext *s = ctx->priv;

  457.     int err;

  458. 

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

  460.     if (err) {

  461. #if !CONFIG_LIBFONTCONFIG

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

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

  464. #endif

  465.         return AVERROR(EINVAL);

  466.     }

  467.     return 0;

  468. }

  469. 

  470. #if CONFIG_LIBFONTCONFIG

  471. static int load_font_fontconfig(AVFilterContext *ctx)

  472. {

  473.     DrawTextContext *s = ctx->priv;

  474.     FcConfig *fontconfig;

  475.     FcPattern *pat, *best;

  476.     FcResult result = FcResultMatch;

  477.     FcChar8 *filename;

  478.     int index;

  479.     double size;

  480.     int err = AVERROR(ENOENT);

  481.     int parse_err;

  482. 

  483.     fontconfig = FcInitLoadConfigAndFonts();

  484.     if (!fontconfig) {

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

  486.         return AVERROR_UNKNOWN;

  487.     }

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

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

  490.     if (!pat) {

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

  492.         return AVERROR(EINVAL);

  493.     }

  494. 

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

  496. 

  497.     parse_err = parse_fontsize(ctx);

  498.     if (!parse_err) {

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

  500. 

  501.         if (isnan(size)) {

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

  503.             return AVERROR(EINVAL);

  504.         }

  505. 

  506.         FcPatternAddDouble(pat, FC_SIZE, size);

  507.     }

  508. 

  509.     FcDefaultSubstitute(pat);

  510. 

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

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

  513.         FcPatternDestroy(pat);

  514.         return AVERROR(ENOMEM);

  515.     }

  516. 

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

  518.     FcPatternDestroy(pat);

  519. 

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

  521.         av_log(ctx, AV_LOG_ERROR,

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

  523.                s->font);

  524.         goto fail;

  525.     }

  526. 

  527.     if (

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

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

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

  531.         return AVERROR(EINVAL);

  532.     }

  533. 

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

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

  536.                s->font);

  537.         goto fail;

  538.     }

  539. 

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

  541.     if (parse_err)

  542.         s->default_fontsize = size + 0.5;

  543. 

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

  545.     if (err)

  546.         return err;

  547.     FcConfigDestroy(fontconfig);

  548. fail:

  549.     FcPatternDestroy(best);

  550.     return err;

  551. }

  552. #endif

  553. 

  554. static int load_font(AVFilterContext *ctx)

  555. {

  556.     DrawTextContext *s = ctx->priv;

  557.     int err;

  558. 

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

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

  561.     if (!err)

  562.         return 0;

  563. #if CONFIG_LIBFONTCONFIG

  564.     err = load_font_fontconfig(ctx);

  565.     if (!err)

  566.         return 0;

  567. #endif

  568.     return err;

  569. }

  570. 

  571. static inline int is_newline(uint32_t c)

  572. {

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

  574. }

  575. 

  576. static int load_textfile(AVFilterContext *ctx)

  577. {

  578.     DrawTextContext *s = ctx->priv;

  579.     int err;

  580.     uint8_t *textbuf;

  581.     uint8_t *tmp;

  582.     size_t textbuf_size;

  583. 

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

  585.         av_log(ctx, AV_LOG_ERROR,

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

  587.                s->textfile);

  588.         return err;

  589.     }

  590. 

  591.     if (textbuf_size > 0 && is_newline(textbuf[textbuf_size - 1]))

  592.         textbuf_size--;

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

  594.         av_file_unmap(textbuf, textbuf_size);

  595.         return AVERROR(ENOMEM);

  596.     }

  597.     s->text = tmp;

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

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

  600.     av_file_unmap(textbuf, textbuf_size);

  601. 

  602.     return 0;

  603. }

  604. 

  605. #if CONFIG_LIBFRIBIDI

  606. static int shape_text(AVFilterContext *ctx)

  607. {

  608.     DrawTextContext *s = ctx->priv;

  609.     uint8_t *tmp;

  610.     int ret = AVERROR(ENOMEM);

  611.     static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT |

  612.                                       FRIBIDI_FLAGS_ARABIC;

  613.     FriBidiChar *unicodestr = NULL;

  614.     FriBidiStrIndex len;

  615.     FriBidiParType direction = FRIBIDI_PAR_LTR;

  616.     FriBidiStrIndex line_start = 0;

  617.     FriBidiStrIndex line_end = 0;

  618.     FriBidiLevel *embedding_levels = NULL;

  619.     FriBidiArabicProp *ar_props = NULL;

  620.     FriBidiCharType *bidi_types = NULL;

  621.     FriBidiStrIndex i,j;

  622. 

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

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

  625.         goto out;

  626.     }

  627.     len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8,

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

  629. 

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

  631.     if (!bidi_types) {

  632.         goto out;

  633.     }

  634. 

  635.     fribidi_get_bidi_types(unicodestr, len, bidi_types);

  636. 

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

  638.     if (!embedding_levels) {

  639.         goto out;

  640.     }

  641. 

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

  643.                                           embedding_levels)) {

  644.         goto out;

  645.     }

  646. 

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

  648.     if (!ar_props) {

  649.         goto out;

  650.     }

  651. 

  652.     fribidi_get_joining_types(unicodestr, len, ar_props);

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

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

  655. 

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

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

  658.             if (!fribidi_reorder_line(flags, bidi_types,

  659.                                       line_end - line_start + 1, line_start,

  660.                                       direction, embedding_levels, unicodestr,

  661.                                       NULL)) {

  662.                 goto out;

  663.             }

  664.             line_start = line_end + 1;

  665.         }

  666.     }

  667. 

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

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

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

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

  672.     len = j;

  673. 

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

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

  676.         goto out;

  677.     }

  678. 

  679.     s->text = tmp;

  680.     len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8,

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

  682.     ret = 0;

  683. 

  684. out:

  685.     av_free(unicodestr);

  686.     av_free(embedding_levels);

  687.     av_free(ar_props);

  688.     av_free(bidi_types);

  689.     return ret;

  690. }

  691. #endif

  692. 

  693. static av_cold int init(AVFilterContext *ctx)

  694. {

  695.     int err;

  696.     DrawTextContext *s = ctx->priv;

  697.     Glyph *glyph;

  698. 

  699.     av_expr_free(s->fontsize_pexpr);

  700.     s->fontsize_pexpr = NULL;

  701. 

  702.     s->fontsize = 0;

  703.     s->default_fontsize = 16;

  704. 

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

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

  707.         return AVERROR(EINVAL);

  708.     }

  709. 

  710.     if (s->textfile) {

  711.         if (s->text) {

  712.             av_log(ctx, AV_LOG_ERROR,

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

  714.             return AVERROR(EINVAL);

  715.         }

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

  717.             return err;

  718.     }

  719. 

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

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

  722. 

  723.     if (s->tc_opt_string) {

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

  725.                                                s->tc_opt_string, ctx);

  726.         if (ret < 0)

  727.             return ret;

  728.         if (s->tc24hmax)

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

  730.         if (!s->text)

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

  732.     }

  733. 

  734.     if (!s->text) {

  735.         av_log(ctx, AV_LOG_ERROR,

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

  737.         return AVERROR(EINVAL);

  738.     }

  739. 

  740. #if CONFIG_LIBFRIBIDI

  741.     if (s->text_shaping)

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

  743.             return err;

  744. #endif

  745. 

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

  747.         av_log(ctx, AV_LOG_ERROR,

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

  749.         return AVERROR(EINVAL);

  750.     }

  751. 

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

  753.         return err;

  754. 

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

  756.         return err;

  757. 

  758.     if (s->borderw) {

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

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

  761.             return AVERROR_EXTERNAL;

  762.         }

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

  764.                        FT_STROKER_LINEJOIN_ROUND, 0);

  765.     }

  766. 

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

  768. 

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

  770.     load_glyph(ctx, NULL, 0);

  771. 

  772.     /* set the tabsize in pixels */

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

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

  775.         return err;

  776.     }

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

  778. 

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

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

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

  782. 

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

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

  785. 

  786.     return 0;

  787. }

  788. 

  789. static int query_formats(AVFilterContext *ctx)

  790. {

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

  792. }

  793. 

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

  795. {

  796.     Glyph *glyph = elem;

  797. 

  798.     FT_Done_Glyph(glyph->glyph);

  799.     FT_Done_Glyph(glyph->border_glyph);

  800.     av_free(elem);

  801.     return 0;

  802. }

  803. 

  804. static av_cold void uninit(AVFilterContext *ctx)

  805. {

  806.     DrawTextContext *s = ctx->priv;

  807. 

  808.     av_expr_free(s->x_pexpr);

  809.     av_expr_free(s->y_pexpr);

  810.     av_expr_free(s->a_pexpr);

  811.     av_expr_free(s->fontsize_pexpr);

  812. 

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

  814. 

  815.     av_freep(&s->positions);

  816.     s->nb_positions = 0;

  817. 

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

  819.     av_tree_destroy(s->glyphs);

  820.     s->glyphs = NULL;

  821. 

  822.     FT_Done_Face(s->face);

  823.     FT_Stroker_Done(s->stroker);

  824.     FT_Done_FreeType(s->library);

  825. 

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

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

  828. }

  829. 

  830. static int config_input(AVFilterLink *inlink)

  831. {

  832.     AVFilterContext *ctx = inlink->dst;

  833.     DrawTextContext *s = ctx->priv;

  834.     char *expr;

  835.     int ret;

  836. 

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

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

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

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

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

  842. 

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

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

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

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

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

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

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

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

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

  852. 

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

  854. 

  855.     av_expr_free(s->x_pexpr);

  856.     av_expr_free(s->y_pexpr);

  857.     av_expr_free(s->a_pexpr);

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

  859. 

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

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

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

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

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

  865.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) {

  866.         av_log(ctx, AV_LOG_ERROR, "Failed to parse expression: %s \n", expr);

  867.         return AVERROR(EINVAL);

  868.     }

  869. 

  870.     return 0;

  871. }

  872. 

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

  874. {

  875.     DrawTextContext *old = ctx->priv;

  876.     DrawTextContext *new = NULL;

  877.     int ret;

  878. 

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

  880.         new = av_mallocz(sizeof(DrawTextContext));

  881.         if (!new)

  882.             return AVERROR(ENOMEM);

  883. 

  884.         new->class = &drawtext_class;

  885.         ret = av_opt_copy(new, old);

  886.         if (ret < 0)

  887.             goto fail;

  888. 

  889.         ctx->priv = new;

  890.         ret = av_set_options_string(ctx, arg, "=", ":");

  891.         if (ret < 0) {

  892.             ctx->priv = old;

  893.             goto fail;

  894.         }

  895. 

  896.         ret = init(ctx);

  897.         if (ret < 0) {

  898.             uninit(ctx);

  899.             ctx->priv = old;

  900.             goto fail;

  901.         }

  902. 

  903.         new->reinit = 1;

  904. 

  905.         ctx->priv = old;

  906.         uninit(ctx);

  907.         av_freep(&old);

  908. 

  909.         ctx->priv = new;

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

  911.     } else

  912.         return AVERROR(ENOSYS);

  913. 

  914. fail:

  915.     av_log(ctx, AV_LOG_ERROR, "Failed to process command. Continuing with existing parameters.\n");

  916.     av_freep(&new);

  917.     return ret;

  918. }

  919. 

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

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

  922. {

  923.     DrawTextContext *s = ctx->priv;

  924. 

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

  926.     return 0;

  927. }

  928. 

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

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

  931. {

  932.     DrawTextContext *s = ctx->priv;

  933.     const char *fmt;

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

  935.     int ret;

  936. 

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

  938.     if (argc >= 2) {

  939.         int64_t delta;

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

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

  942.             return ret;

  943.         }

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

  945.     }

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

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

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

  949.         if (isnan(pts)) {

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

  951.         } else {

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

  953.             char sign = ' ';

  954.             if (ms < 0) {

  955.                 sign = '-';

  956.                 ms = -ms;

  957.             }

  958.             if (argc >= 3) {

  959.                 if (!strcmp(argv[2], "24HH")) {

  960.                     ms %= 24 * 60 * 60 * 1000;

  961.                 } else {

  962.                     av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", argv[2]);

  963.                     return AVERROR(EINVAL);

  964.                 }

  965.             }

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

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

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

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

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

  971.         }

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

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

  974.         struct tm tm;

  975.         time_t ms = (time_t)pts;

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

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

  978.             localtime_r(&ms, &tm);

  979.         else

  980.             gmtime_r(&ms, &tm);

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

  982.     } else {

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

  984.         return AVERROR(EINVAL);

  985.     }

  986.     return 0;

  987. }

  988. 

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

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

  991. {

  992.     DrawTextContext *s = ctx->priv;

  993. 

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

  995.     return 0;

  996. }

  997. 

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

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

  1000. {

  1001.     DrawTextContext *s = ctx->priv;

  1002.     AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);

  1003. 

  1004.     if (e && e->value)

  1005.         av_bprintf(bp, "%s", e->value);

  1006.     else if (argc >= 2)

  1007.         av_bprintf(bp, "%s", argv[1]);

  1008.     return 0;

  1009. }

  1010. 

  1011. static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,

  1012.                          char *fct, unsigned argc, char **argv, int tag)

  1013. {

  1014.     const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";

  1015.     time_t now;

  1016.     struct tm tm;

  1017. 

  1018.     time(&now);

  1019.     if (tag == 'L')

  1020.         localtime_r(&now, &tm);

  1021.     else

  1022.         tm = *gmtime_r(&now, &tm);

  1023.     av_bprint_strftime(bp, fmt, &tm);

  1024.     return 0;

  1025. }

  1026. 

  1027. static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,

  1028.                           char *fct, unsigned argc, char **argv, int tag)

  1029. {

  1030.     DrawTextContext *s = ctx->priv;

  1031.     double res;

  1032.     int ret;

  1033. 

  1034.     ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,

  1035.                                  NULL, NULL, fun2_names, fun2,

  1036.                                  &s->prng, 0, ctx);

  1037.     if (ret < 0)

  1038.         av_log(ctx, AV_LOG_ERROR,

  1039.                "Expression '%s' for the expr text expansion function is not valid\n",

  1040.                argv[0]);

  1041.     else

  1042.         av_bprintf(bp, "%f", res);

  1043. 

  1044.     return ret;

  1045. }

  1046. 

  1047. static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp,

  1048.                           char *fct, unsigned argc, char **argv, int tag)

  1049. {

  1050.     DrawTextContext *s = ctx->priv;

  1051.     double res;

  1052.     int intval;

  1053.     int ret;

  1054.     unsigned int positions = 0;

  1055.     char fmt_str[30] = "%";

  1056. 

  1057.     /*

  1058.      * argv[0] expression to be converted to `int`

  1059.      * argv[1] format: 'x', 'X', 'd' or 'u'

  1060.      * argv[2] positions printed (optional)

  1061.      */

  1062. 

  1063.     ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,

  1064.                                  NULL, NULL, fun2_names, fun2,

  1065.                                  &s->prng, 0, ctx);

  1066.     if (ret < 0) {

  1067.         av_log(ctx, AV_LOG_ERROR,

  1068.                "Expression '%s' for the expr text expansion function is not valid\n",

  1069.                argv[0]);

  1070.         return ret;

  1071.     }

  1072. 

  1073.     if (!strchr("xXdu", argv[1][0])) {

  1074.         av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified,"

  1075.                 " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]);

  1076.         return AVERROR(EINVAL);

  1077.     }

  1078. 

  1079.     if (argc == 3) {

  1080.         ret = sscanf(argv[2], "%u", &positions);

  1081.         if (ret != 1) {

  1082.             av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions"

  1083.                     " to print: '%s'\n", argv[2]);

  1084.             return AVERROR(EINVAL);

  1085.         }

  1086.     }

  1087. 

  1088.     feclearexcept(FE_ALL_EXCEPT);

  1089.     intval = res;

  1090. #if defined(FE_INVALID) && defined(FE_OVERFLOW) && defined(FE_UNDERFLOW)

  1091.     if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) {

  1092.         av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval);

  1093.         return AVERROR(EINVAL);

  1094.     }

  1095. #endif

  1096. 

  1097.     if (argc == 3)

  1098.         av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions);

  1099.     av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]);

  1100. 

  1101.     av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n",

  1102.             res, argv[0], fmt_str);

  1103. 

  1104.     av_bprintf(bp, fmt_str, intval);

  1105. 

  1106.     return 0;

  1107. }

  1108. 

  1109. static const struct drawtext_function {

  1110.     const char *name;

  1111.     unsigned argc_min, argc_max;

  1112.     int tag;                            /**< opaque argument to func */

  1113.     int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);

  1114. } functions[] = {

  1115.     { "expr",      1, 1, 0,   func_eval_expr },

  1116.     { "e",         1, 1, 0,   func_eval_expr },

  1117.     { "expr_int_format", 2, 3, 0, func_eval_expr_int_format },

  1118.     { "eif",       2, 3, 0,   func_eval_expr_int_format },

  1119.     { "pict_type", 0, 0, 0,   func_pict_type },

  1120.     { "pts",       0, 3, 0,   func_pts      },

  1121.     { "gmtime",    0, 1, 'G', func_strftime },

  1122.     { "localtime", 0, 1, 'L', func_strftime },

  1123.     { "frame_num", 0, 0, 0,   func_frame_num },

  1124.     { "n",         0, 0, 0,   func_frame_num },

  1125.     { "metadata",  1, 2, 0,   func_metadata },

  1126. };

  1127. 

  1128. static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,

  1129.                          unsigned argc, char **argv)

  1130. {

  1131.     unsigned i;

  1132. 

  1133.     for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {

  1134.         if (strcmp(fct, functions[i].name))

  1135.             continue;

  1136.         if (argc < functions[i].argc_min) {

  1137.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",

  1138.                    fct, functions[i].argc_min);

  1139.             return AVERROR(EINVAL);

  1140.         }

  1141.         if (argc > functions[i].argc_max) {

  1142.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",

  1143.                    fct, functions[i].argc_max);

  1144.             return AVERROR(EINVAL);

  1145.         }

  1146.         break;

  1147.     }

  1148.     if (i >= FF_ARRAY_ELEMS(functions)) {

  1149.         av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);

  1150.         return AVERROR(EINVAL);

  1151.     }

  1152.     return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);

  1153. }

  1154. 

  1155. static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)

  1156. {

  1157.     const char *text = *rtext;

  1158.     char *argv[16] = { NULL };

  1159.     unsigned argc = 0, i;

  1160.     int ret;

  1161. 

  1162.     if (*text != '{') {

  1163.         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);

  1164.         return AVERROR(EINVAL);

  1165.     }

  1166.     text++;

  1167.     while (1) {

  1168.         if (!(argv[argc++] = av_get_token(&text, ":}"))) {

  1169.             ret = AVERROR(ENOMEM);

  1170.             goto end;

  1171.         }

  1172.         if (!*text) {

  1173.             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);

  1174.             ret = AVERROR(EINVAL);

  1175.             goto end;

  1176.         }

  1177.         if (argc == FF_ARRAY_ELEMS(argv))

  1178.             av_freep(&argv[--argc]); /* error will be caught later */

  1179.         if (*text == '}')

  1180.             break;

  1181.         text++;

  1182.     }

  1183. 

  1184.     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)

  1185.         goto end;

  1186.     ret = 0;

  1187.     *rtext = (char *)text + 1;

  1188. 

  1189. end:

  1190.     for (i = 0; i < argc; i++)

  1191.         av_freep(&argv[i]);

  1192.     return ret;

  1193. }

  1194. 

  1195. static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp)

  1196. {

  1197.     int ret;

  1198. 

  1199.     av_bprint_clear(bp);

  1200.     while (*text) {

  1201.         if (*text == '\\' && text[1]) {

  1202.             av_bprint_chars(bp, text[1], 1);

  1203.             text += 2;

  1204.         } else if (*text == '%') {

  1205.             text++;

  1206.             if ((ret = expand_function(ctx, bp, &text)) < 0)

  1207.                 return ret;

  1208.         } else {

  1209.             av_bprint_chars(bp, *text, 1);

  1210.             text++;

  1211.         }

  1212.     }

  1213.     if (!av_bprint_is_complete(bp))

  1214.         return AVERROR(ENOMEM);

  1215.     return 0;

  1216. }

  1217. 

  1218. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  1219.                        int width, int height,

  1220.                        FFDrawColor *color,

  1221.                        int x, int y, int borderw)

  1222. {

  1223.     char *text = s->expanded_text.str;

  1224.     uint32_t code = 0;

  1225.     int i, x1, y1;

  1226.     uint8_t *p;

  1227.     Glyph *glyph = NULL;

  1228. 

  1229.     for (i = 0, p = text; *p; i++) {

  1230.         FT_Bitmap bitmap;

  1231.         Glyph dummy = { 0 };

  1232.         GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid;);

  1233. continue_on_invalid:

  1234. 

  1235.         /* skip new line chars, just go to new line */

  1236.         if (code == '\n' || code == '\r' || code == '\t')

  1237.             continue;

  1238. 

  1239.         dummy.code = code;

  1240.         dummy.fontsize = s->fontsize;

  1241.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1242. 

  1243.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  1244. 

  1245.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&

  1246.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)

  1247.             return AVERROR(EINVAL);

  1248. 

  1249.         x1 = s->positions[i].x+s->x+x - borderw;

  1250.         y1 = s->positions[i].y+s->y+y - borderw;

  1251. 

  1252.         ff_blend_mask(&s->dc, color,

  1253.                       frame->data, frame->linesize, width, height,

  1254.                       bitmap.buffer, bitmap.pitch,

  1255.                       bitmap.width, bitmap.rows,

  1256.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  1257.                       0, x1, y1);

  1258.     }

  1259. 

  1260.     return 0;

  1261. }

  1262. 

  1263. 

  1264. static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor)

  1265. {

  1266.     *color = incolor;

  1267.     color->rgba[3] = (color->rgba[3] * s->alpha) / 255;

  1268.     ff_draw_color(&s->dc, color, color->rgba);

  1269. }

  1270. 

  1271. static void update_alpha(DrawTextContext *s)

  1272. {

  1273.     double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);

  1274. 

  1275.     if (isnan(alpha))

  1276.         return;

  1277. 

  1278.     if (alpha >= 1.0)

  1279.         s->alpha = 255;

  1280.     else if (alpha <= 0)

  1281.         s->alpha = 0;

  1282.     else

  1283.         s->alpha = 256 * alpha;

  1284. }

  1285. 

  1286. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  1287.                      int width, int height)

  1288. {

  1289.     DrawTextContext *s = ctx->priv;

  1290.     AVFilterLink *inlink = ctx->inputs[0];

  1291. 

  1292.     uint32_t code = 0, prev_code = 0;

  1293.     int x = 0, y = 0, i = 0, ret;

  1294.     int max_text_line_w = 0, len;

  1295.     int box_w, box_h;

  1296.     char *text;

  1297.     uint8_t *p;

  1298.     int y_min = 32000, y_max = -32000;

  1299.     int x_min = 32000, x_max = -32000;

  1300.     FT_Vector delta;

  1301.     Glyph *glyph = NULL, *prev_glyph = NULL;

  1302.     Glyph dummy = { 0 };

  1303. 

  1304.     time_t now = time(0);

  1305.     struct tm ltime;

  1306.     AVBPrint *bp = &s->expanded_text;

  1307. 

  1308.     FFDrawColor fontcolor;

  1309.     FFDrawColor shadowcolor;

  1310.     FFDrawColor bordercolor;

  1311.     FFDrawColor boxcolor;

  1312. 

  1313.     av_bprint_clear(bp);

  1314. 

  1315.     if(s->basetime != AV_NOPTS_VALUE)

  1316.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;

  1317. 

  1318.     switch (s->exp_mode) {

  1319.     case EXP_NONE:

  1320.         av_bprintf(bp, "%s", s->text);

  1321.         break;

  1322.     case EXP_NORMAL:

  1323.         if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0)

  1324.             return ret;

  1325.         break;

  1326.     case EXP_STRFTIME:

  1327.         localtime_r(&now, &ltime);

  1328.         av_bprint_strftime(bp, s->text, &ltime);

  1329.         break;

  1330.     }

  1331. 

  1332.     if (s->tc_opt_string) {

  1333.         char tcbuf[AV_TIMECODE_STR_SIZE];

  1334.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out);

  1335.         av_bprint_clear(bp);

  1336.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1337.     }

  1338. 

  1339.     if (!av_bprint_is_complete(bp))

  1340.         return AVERROR(ENOMEM);

  1341.     text = s->expanded_text.str;

  1342.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1343.         if (!(s->positions =

  1344.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1345.             return AVERROR(ENOMEM);

  1346.         s->nb_positions = len;

  1347.     }

  1348. 

  1349.     if (s->fontcolor_expr[0]) {

  1350.         /* If expression is set, evaluate and replace the static value */

  1351.         av_bprint_clear(&s->expanded_fontcolor);

  1352.         if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0)

  1353.             return ret;

  1354.         if (!av_bprint_is_complete(&s->expanded_fontcolor))

  1355.             return AVERROR(ENOMEM);

  1356.         av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str);

  1357.         ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s);

  1358.         if (ret)

  1359.             return ret;

  1360.         ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);

  1361.     }

  1362. 

  1363.     x = 0;

  1364.     y = 0;

  1365. 

  1366.     if ((ret = update_fontsize(ctx)) < 0)

  1367.         return ret;

  1368. 

  1369.     /* load and cache glyphs */

  1370.     for (i = 0, p = text; *p; i++) {

  1371.         GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid;);

  1372. continue_on_invalid:

  1373. 

  1374.         /* get glyph */

  1375.         dummy.code = code;

  1376.         dummy.fontsize = s->fontsize;

  1377.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1378.         if (!glyph) {

  1379.             ret = load_glyph(ctx, &glyph, code);

  1380.             if (ret < 0)

  1381.                 return ret;

  1382.         }

  1383. 

  1384.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1385.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1386.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1387.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1388.     }

  1389.     s->max_glyph_h = y_max - y_min;

  1390.     s->max_glyph_w = x_max - x_min;

  1391. 

  1392.     /* compute and save position for each glyph */

  1393.     glyph = NULL;

  1394.     for (i = 0, p = text; *p; i++) {

  1395.         GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_invalid2;);

  1396. continue_on_invalid2:

  1397. 

  1398.         /* skip the \n in the sequence \r\n */

  1399.         if (prev_code == '\r' && code == '\n')

  1400.             continue;

  1401. 

  1402.         prev_code = code;

  1403.         if (is_newline(code)) {

  1404. 

  1405.             max_text_line_w = FFMAX(max_text_line_w, x);

  1406.             y += s->max_glyph_h + s->line_spacing;

  1407.             x = 0;

  1408.             continue;

  1409.         }

  1410. 

  1411.         /* get glyph */

  1412.         prev_glyph = glyph;

  1413.         dummy.code = code;

  1414.         dummy.fontsize = s->fontsize;

  1415.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1416. 

  1417.         /* kerning */

  1418.         if (s->use_kerning && prev_glyph && glyph->code) {

  1419.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1420.                            ft_kerning_default, &delta);

  1421.             x += delta.x >> 6;

  1422.         }

  1423. 

  1424.         /* save position */

  1425.         s->positions[i].x = x + glyph->bitmap_left;

  1426.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1427.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1428.         else              x += glyph->advance;

  1429.     }

  1430. 

  1431.     max_text_line_w = FFMAX(x, max_text_line_w);

  1432. 

  1433.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1434.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1435. 

  1436.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1437.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1438.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1439.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1440. 

  1441.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1442. 

  1443.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1444.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1445.     /* It is necessary if x is expressed from y  */

  1446.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1447. 

  1448.     update_alpha(s);

  1449.     update_color_with_alpha(s, &fontcolor  , s->fontcolor  );

  1450.     update_color_with_alpha(s, &shadowcolor, s->shadowcolor);

  1451.     update_color_with_alpha(s, &bordercolor, s->bordercolor);

  1452.     update_color_with_alpha(s, &boxcolor   , s->boxcolor   );

  1453. 

  1454.     box_w = max_text_line_w;

  1455.     box_h = y + s->max_glyph_h;

  1456. 

  1457.     if (s->fix_bounds) {

  1458. 

  1459.         /* calculate footprint of text effects */

  1460.         int boxoffset     = s->draw_box ? FFMAX(s->boxborderw, 0) : 0;

  1461.         int borderoffset  = s->borderw  ? FFMAX(s->borderw, 0) : 0;

  1462. 

  1463.         int offsetleft = FFMAX3(boxoffset, borderoffset,

  1464.                                 (s->shadowx < 0 ? FFABS(s->shadowx) : 0));

  1465.         int offsettop = FFMAX3(boxoffset, borderoffset,

  1466.                                 (s->shadowy < 0 ? FFABS(s->shadowy) : 0));

  1467. 

  1468.         int offsetright = FFMAX3(boxoffset, borderoffset,

  1469.                                  (s->shadowx > 0 ? s->shadowx : 0));

  1470.         int offsetbottom = FFMAX3(boxoffset, borderoffset,

  1471.                                   (s->shadowy > 0 ? s->shadowy : 0));

  1472. 

  1473. 

  1474.         if (s->x - offsetleft < 0) s->x = offsetleft;

  1475.         if (s->y - offsettop < 0)  s->y = offsettop;

  1476. 

  1477.         if (s->x + box_w + offsetright > width)

  1478.             s->x = FFMAX(width - box_w - offsetright, 0);

  1479.         if (s->y + box_h + offsetbottom > height)

  1480.             s->y = FFMAX(height - box_h - offsetbottom, 0);

  1481.     }

  1482. 

  1483.     /* draw box */

  1484.     if (s->draw_box)

  1485.         ff_blend_rectangle(&s->dc, &boxcolor,

  1486.                            frame->data, frame->linesize, width, height,

  1487.                            s->x - s->boxborderw, s->y - s->boxborderw,

  1488.                            box_w + s->boxborderw * 2, box_h + s->boxborderw * 2);

  1489. 

  1490.     if (s->shadowx || s->shadowy) {

  1491.         if ((ret = draw_glyphs(s, frame, width, height,

  1492.                                &shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1493.             return ret;

  1494.     }

  1495. 

  1496.     if (s->borderw) {

  1497.         if ((ret = draw_glyphs(s, frame, width, height,

  1498.                                &bordercolor, 0, 0, s->borderw)) < 0)

  1499.             return ret;

  1500.     }

  1501.     if ((ret = draw_glyphs(s, frame, width, height,

  1502.                            &fontcolor, 0, 0, 0)) < 0)

  1503.         return ret;

  1504. 

  1505.     return 0;

  1506. }

  1507. 

  1508. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1509. {

  1510.     AVFilterContext *ctx = inlink->dst;

  1511.     AVFilterLink *outlink = ctx->outputs[0];

  1512.     DrawTextContext *s = ctx->priv;

  1513.     int ret;

  1514. 

  1515.     if (s->reload) {

  1516.         if ((ret = load_textfile(ctx)) < 0) {

  1517.             av_frame_free(&frame);

  1518.             return ret;

  1519.         }

  1520. #if CONFIG_LIBFRIBIDI

  1521.         if (s->text_shaping)

  1522.             if ((ret = shape_text(ctx)) < 0) {

  1523.                 av_frame_free(&frame);

  1524.                 return ret;

  1525.             }

  1526. #endif

  1527.     }

  1528. 

  1529.     s->var_values[VAR_N] = inlink->frame_count_out + s->start_number;

  1530.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1531.         NAN : frame->pts * av_q2d(inlink->time_base);

  1532. 

  1533.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1534.     s->var_values[VAR_PKT_POS] = frame->pkt_pos;

  1535.     s->var_values[VAR_PKT_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base);

  1536.     s->var_values[VAR_PKT_SIZE] = frame->pkt_size;

  1537.     s->metadata = frame->metadata;

  1538. 

  1539.     draw_text(ctx, frame, frame->width, frame->height);

  1540. 

  1541.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1542.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1543.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1544.            s->x, s->y);

  1545. 

  1546.     return ff_filter_frame(outlink, frame);

  1547. }

  1548. 

  1549. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1550.     {

  1551.         .name           = "default",

  1552.         .type           = AVMEDIA_TYPE_VIDEO,

  1553.         .filter_frame   = filter_frame,

  1554.         .config_props   = config_input,

  1555.         .needs_writable = 1,

  1556.     },

  1557.     { NULL }

  1558. };

  1559. 

  1560. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1561.     {

  1562.         .name = "default",

  1563.         .type = AVMEDIA_TYPE_VIDEO,

  1564.     },

  1565.     { NULL }

  1566. };

  1567. 

  1568. AVFilter ff_vf_drawtext = {

  1569.     .name          = "drawtext",

  1570.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1571.     .priv_size     = sizeof(DrawTextContext),

  1572.     .priv_class    = &drawtext_class,

  1573.     .init          = init,

  1574.     .uninit        = uninit,

  1575.     .query_formats = query_formats,

  1576.     .inputs        = avfilter_vf_drawtext_inputs,

  1577.     .outputs       = avfilter_vf_drawtext_outputs,

  1578.     .process_command = command,

  1579.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1580. };