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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 <sys/time.h>

  30. #include <time.h>

  31. 

  32. #include "config.h"

  33. #include "libavutil/avstring.h"

  34. #include "libavutil/bprint.h"

  35. #include "libavutil/common.h"

  36. #include "libavutil/file.h"

  37. #include "libavutil/eval.h"

  38. #include "libavutil/opt.h"

  39. #include "libavutil/random_seed.h"

  40. #include "libavutil/parseutils.h"

  41. #include "libavutil/timecode.h"

  42. #include "libavutil/tree.h"

  43. #include "libavutil/lfg.h"

  44. #include "avfilter.h"

  45. #include "drawutils.h"

  46. #include "formats.h"

  47. #include "internal.h"

  48. #include "video.h"

  49. 

  50. #include <ft2build.h>

  51. #include FT_FREETYPE_H

  52. #include FT_GLYPH_H

  53. #include FT_STROKER_H

  54. #if CONFIG_FONTCONFIG

  55. #include <fontconfig/fontconfig.h>

  56. #endif

  57. 

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

  59.     "dar",

  60.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  69.     "sar",

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

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

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

  73.     "x",

  74.     "y",

  75.     "pict_type",

  76.     NULL

  77. };

  78. 

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

  80.     "rand"

  81. };

  82. 

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

  84. {

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

  86. }

  87. 

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

  89. 

  90. static const eval_func2 fun2[] = {

  91.     drand,

  92.     NULL

  93. };

  94. 

  95. enum var_name {

  96.     VAR_DAR,

  97.     VAR_HSUB, VAR_VSUB,

  98.     VAR_LINE_H, VAR_LH,

  99.     VAR_MAIN_H, VAR_h, VAR_H,

  100.     VAR_MAIN_W, VAR_w, VAR_W,

  101.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  102.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  103.     VAR_MAX_GLYPH_H,

  104.     VAR_MAX_GLYPH_W,

  105.     VAR_N,

  106.     VAR_SAR,

  107.     VAR_T,

  108.     VAR_TEXT_H, VAR_TH,

  109.     VAR_TEXT_W, VAR_TW,

  110.     VAR_X,

  111.     VAR_Y,

  112.     VAR_PICT_TYPE,

  113.     VAR_VARS_NB

  114. };

  115. 

  116. enum expansion_mode {

  117.     EXP_NONE,

  118.     EXP_NORMAL,

  119.     EXP_STRFTIME,

  120. };

  121. 

  122. typedef struct {

  123.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

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

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

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

  137.     int shadowx, shadowy;

  138.     int borderw;                    ///< border width

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

  140. 

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

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

  143.     int tabsize;                    ///< tab size

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

  145. 

  146.     FFDrawContext dc;

  147.     FFDrawColor fontcolor;          ///< foreground color

  148.     FFDrawColor shadowcolor;        ///< shadow color

  149.     FFDrawColor bordercolor;        ///< border color

  150.     FFDrawColor boxcolor;           ///< background color

  151. 

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

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

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

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

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

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

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

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

  160.     double var_values[VAR_VARS_NB];

  161. #if FF_API_DRAWTEXT_OLD_TIMELINE

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

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

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

  165. #endif

  166.     AVLFG  prng;                    ///< random

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

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

  169.     AVTimecode  tc;                 ///< timecode context

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

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

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

  173.     AVDictionary *metadata;

  174. } DrawTextContext;

  175. 

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

  177. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  178. 

  179. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  196. #if FF_API_DRAWTEXT_OLD_TIMELINE

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

  198. #endif

  199. 

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

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

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

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

  204. 

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

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

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

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

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

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

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

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

  213. 

  214.     /* FT_LOAD_* flags */

  215.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  231.     { NULL }

  232. };

  233. 

  234. AVFILTER_DEFINE_CLASS(drawtext);

  235. 

  236. #undef __FTERRORS_H__

  237. #define FT_ERROR_START_LIST {

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

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

  240. 

  241. struct ft_error

  242. {

  243.     int err;

  244.     const char *err_msg;

  245. } static ft_errors[] =

  246. #include FT_ERRORS_H

  247. 

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

  249. 

  250. typedef struct {

  251.     FT_Glyph *glyph;

  252.     uint32_t code;

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

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

  255.     FT_BBox bbox;

  256.     int advance;

  257.     int bitmap_left;

  258.     int bitmap_top;

  259. } Glyph;

  260. 

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

  262. {

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

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

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

  266. }

  267. 

  268. /**

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

  270.  */

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

  272. {

  273.     DrawTextContext *s = ctx->priv;

  274.     FT_BitmapGlyph bitmapglyph;

  275.     Glyph *glyph;

  276.     struct AVTreeNode *node = NULL;

  277.     int ret;

  278. 

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

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

  281.         return AVERROR(EINVAL);

  282. 

  283.     /* save glyph */

  284.     if (!(glyph = av_mallocz(sizeof(*glyph))) ||

  285.         !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {

  286.         ret = AVERROR(ENOMEM);

  287.         goto error;

  288.     }

  289.     glyph->code  = code;

  290. 

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

  292.         ret = AVERROR(EINVAL);

  293.         goto error;

  294.     }

  295.     if (s->borderw) {

  296.         FT_Glyph border_glyph = *glyph->glyph;

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

  298.             FT_Glyph_To_Bitmap(&border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {

  299.             ret = AVERROR_EXTERNAL;

  300.             goto error;

  301.         }

  302.         bitmapglyph = (FT_BitmapGlyph) border_glyph;

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

  304.     }

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

  306.         ret = AVERROR_EXTERNAL;

  307.         goto error;

  308.     }

  309.     bitmapglyph = (FT_BitmapGlyph) *glyph->glyph;

  310. 

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

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

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

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

  315. 

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

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

  318. 

  319.     /* cache the newly created glyph */

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

  321.         ret = AVERROR(ENOMEM);

  322.         goto error;

  323.     }

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

  325. 

  326.     if (glyph_ptr)

  327.         *glyph_ptr = glyph;

  328.     return 0;

  329. 

  330. error:

  331.     if (glyph)

  332.         av_freep(&glyph->glyph);

  333.     av_freep(&glyph);

  334.     av_freep(&node);

  335.     return ret;

  336. }

  337. 

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

  339.                           const char **error)

  340. {

  341.     DrawTextContext *s = ctx->priv;

  342.     int err;

  343. 

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

  345.     if (err) {

  346.         *error = FT_ERRMSG(err);

  347.         return AVERROR(EINVAL);

  348.     }

  349.     return 0;

  350. }

  351. 

  352. #if CONFIG_FONTCONFIG

  353. static int load_font_fontconfig(AVFilterContext *ctx, const char **error)

  354. {

  355.     DrawTextContext *s = ctx->priv;

  356.     FcConfig *fontconfig;

  357.     FcPattern *pattern, *fpat;

  358.     FcResult result = FcResultMatch;

  359.     FcChar8 *filename;

  360.     int err, index;

  361.     double size;

  362. 

  363.     fontconfig = FcInitLoadConfigAndFonts();

  364.     if (!fontconfig) {

  365.         *error = "impossible to init fontconfig\n";

  366.         return AVERROR(EINVAL);

  367.     }

  368.     pattern = FcNameParse(s->fontfile ? s->fontfile :

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

  370.     if (!pattern) {

  371.         *error = "could not parse fontconfig pattern";

  372.         return AVERROR(EINVAL);

  373.     }

  374.     if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) {

  375.         *error = "could not substitue fontconfig options"; /* very unlikely */

  376.         return AVERROR(EINVAL);

  377.     }

  378.     FcDefaultSubstitute(pattern);

  379.     fpat = FcFontMatch(fontconfig, pattern, &result);

  380.     if (!fpat || result != FcResultMatch) {

  381.         *error = "impossible to find a matching font";

  382.         return AVERROR(EINVAL);

  383.     }

  384.     if (FcPatternGetString (fpat, FC_FILE,  0, &filename) != FcResultMatch ||

  385.         FcPatternGetInteger(fpat, FC_INDEX, 0, &index   ) != FcResultMatch ||

  386.         FcPatternGetDouble (fpat, FC_SIZE,  0, &size    ) != FcResultMatch) {

  387.         *error = "impossible to find font information";

  388.         return AVERROR(EINVAL);

  389.     }

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

  391.     if (!s->fontsize)

  392.         s->fontsize = size + 0.5;

  393.     err = load_font_file(ctx, filename, index, error);

  394.     if (err)

  395.         return err;

  396.     FcPatternDestroy(fpat);

  397.     FcPatternDestroy(pattern);

  398.     FcConfigDestroy(fontconfig);

  399.     return 0;

  400. }

  401. #endif

  402. 

  403. static int load_font(AVFilterContext *ctx)

  404. {

  405.     DrawTextContext *s = ctx->priv;

  406.     int err;

  407.     const char *error = "unknown error\n";

  408. 

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

  410.     err = load_font_file(ctx, s->fontfile, 0, &error);

  411.     if (!err)

  412.         return 0;

  413. #if CONFIG_FONTCONFIG

  414.     err = load_font_fontconfig(ctx, &error);

  415.     if (!err)

  416.         return 0;

  417. #endif

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

  419.            s->fontfile, error);

  420.     return err;

  421. }

  422. 

  423. static int load_textfile(AVFilterContext *ctx)

  424. {

  425.     DrawTextContext *s = ctx->priv;

  426.     int err;

  427.     uint8_t *textbuf;

  428.     size_t textbuf_size;

  429. 

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

  431.         av_log(ctx, AV_LOG_ERROR,

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

  433.                s->textfile);

  434.         return err;

  435.     }

  436. 

  437.     if (!(s->text = av_realloc(s->text, textbuf_size + 1)))

  438.         return AVERROR(ENOMEM);

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

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

  441.     av_file_unmap(textbuf, textbuf_size);

  442. 

  443.     return 0;

  444. }

  445. 

  446. static av_cold int init(AVFilterContext *ctx)

  447. {

  448.     int err;

  449.     DrawTextContext *s = ctx->priv;

  450.     Glyph *glyph;

  451. 

  452. #if FF_API_DRAWTEXT_OLD_TIMELINE

  453.     if (s->draw_expr)

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

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

  456. #endif

  457. 

  458.     if (!s->fontfile && !CONFIG_FONTCONFIG) {

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

  460.         return AVERROR(EINVAL);

  461.     }

  462. 

  463.     if (s->textfile) {

  464.         if (s->text) {

  465.             av_log(ctx, AV_LOG_ERROR,

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

  467.             return AVERROR(EINVAL);

  468.         }

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

  470.             return err;

  471.     }

  472. 

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

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

  475. 

  476.     if (s->tc_opt_string) {

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

  478.                                                s->tc_opt_string, ctx);

  479.         if (ret < 0)

  480.             return ret;

  481.         if (s->tc24hmax)

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

  483.         if (!s->text)

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

  485.     }

  486. 

  487.     if (!s->text) {

  488.         av_log(ctx, AV_LOG_ERROR,

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

  490.         return AVERROR(EINVAL);

  491.     }

  492. 

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

  494.         av_log(ctx, AV_LOG_ERROR,

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

  496.         return AVERROR(EINVAL);

  497.     }

  498. 

  499.     err = load_font(ctx);

  500.     if (err)

  501.         return err;

  502.     if (!s->fontsize)

  503.         s->fontsize = 16;

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

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

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

  507.         return AVERROR(EINVAL);

  508.     }

  509. 

  510.     if (s->borderw) {

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

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

  513.             return AVERROR_EXTERNAL;

  514.         }

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

  516.                        FT_STROKER_LINEJOIN_ROUND, 0);

  517.     }

  518. 

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

  520. 

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

  522.     load_glyph(ctx, NULL, 0);

  523. 

  524.     /* set the tabsize in pixels */

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

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

  527.         return err;

  528.     }

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

  530. 

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

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

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

  534. 

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

  536. 

  537.     return 0;

  538. }

  539. 

  540. static int query_formats(AVFilterContext *ctx)

  541. {

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

  543.     return 0;

  544. }

  545. 

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

  547. {

  548.     Glyph *glyph = elem;

  549. 

  550.     FT_Done_Glyph(*glyph->glyph);

  551.     av_freep(&glyph->glyph);

  552.     av_free(elem);

  553.     return 0;

  554. }

  555. 

  556. static av_cold void uninit(AVFilterContext *ctx)

  557. {

  558.     DrawTextContext *s = ctx->priv;

  559. 

  560.     av_expr_free(s->x_pexpr);

  561.     av_expr_free(s->y_pexpr);

  562. #if FF_API_DRAWTEXT_OLD_TIMELINE

  563.     av_expr_free(s->draw_pexpr);

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

  565. #endif

  566.     av_freep(&s->positions);

  567.     s->nb_positions = 0;

  568. 

  569. 

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

  571.     av_tree_destroy(s->glyphs);

  572.     s->glyphs = NULL;

  573. 

  574.     FT_Done_Face(s->face);

  575.     FT_Stroker_Done(s->stroker);

  576.     FT_Done_FreeType(s->library);

  577. 

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

  579. }

  580. 

  581. static inline int is_newline(uint32_t c)

  582. {

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

  584. }

  585. 

  586. static int config_input(AVFilterLink *inlink)

  587. {

  588.     AVFilterContext *ctx = inlink->dst;

  589.     DrawTextContext *s = ctx->priv;

  590.     int ret;

  591. 

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

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

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

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

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

  597. 

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

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

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

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

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

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

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

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

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

  607. 

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

  609. 

  610.     av_expr_free(s->x_pexpr);

  611.     av_expr_free(s->y_pexpr);

  612. #if FF_API_DRAWTEXT_OLD_TIMELINE

  613.     av_expr_free(s->draw_pexpr);

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

  615. #else

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

  617. #endif

  618. 

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

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

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

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

  623. 

  624.         return AVERROR(EINVAL);

  625. #if FF_API_DRAWTEXT_OLD_TIMELINE

  626.     if (s->draw_expr &&

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

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

  629.         return ret;

  630. #endif

  631. 

  632.     return 0;

  633. }

  634. 

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

  636. {

  637.     DrawTextContext *s = ctx->priv;

  638. 

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

  640.         int ret;

  641.         uninit(ctx);

  642.         s->reinit = 1;

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

  644.             return ret;

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

  646.     }

  647. 

  648.     return AVERROR(ENOSYS);

  649. }

  650. 

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

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

  653. {

  654.     DrawTextContext *s = ctx->priv;

  655. 

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

  657.     return 0;

  658. }

  659. 

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

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

  662. {

  663.     DrawTextContext *s = ctx->priv;

  664. 

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

  666.     return 0;

  667. }

  668. 

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

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

  671. {

  672.     DrawTextContext *s = ctx->priv;

  673. 

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

  675.     return 0;

  676. }

  677. 

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

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

  680. {

  681.     DrawTextContext *s = ctx->priv;

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

  683. 

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

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

  686.     return 0;

  687. }

  688. 

  689. #if !HAVE_LOCALTIME_R

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

  691. {

  692.     *tm = *localtime(t);

  693. }

  694. #endif

  695. 

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

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

  698. {

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

  700.     time_t now;

  701.     struct tm tm;

  702. 

  703.     time(&now);

  704.     if (tag == 'L')

  705.         localtime_r(&now, &tm);

  706.     else

  707.         tm = *gmtime(&now);

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

  709.     return 0;

  710. }

  711. 

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

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

  714. {

  715.     DrawTextContext *s = ctx->priv;

  716.     double res;

  717.     int ret;

  718. 

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

  720.                                  NULL, NULL, fun2_names, fun2,

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

  722.     if (ret < 0)

  723.         av_log(ctx, AV_LOG_ERROR,

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

  725.                argv[0]);

  726.     else

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

  728. 

  729.     return ret;

  730. }

  731. 

  732. static const struct drawtext_function {

  733.     const char *name;

  734.     unsigned argc_min, argc_max;

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

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

  737. } functions[] = {

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

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

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

  741.     { "pts",       0, 0, 0,   func_pts      },

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

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

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

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

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

  747. };

  748. 

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

  750.                          unsigned argc, char **argv)

  751. {

  752.     unsigned i;

  753. 

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

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

  756.             continue;

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

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

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

  760.             return AVERROR(EINVAL);

  761.         }

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

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

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

  765.             return AVERROR(EINVAL);

  766.         }

  767.         break;

  768.     }

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

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

  771.         return AVERROR(EINVAL);

  772.     }

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

  774. }

  775. 

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

  777. {

  778.     const char *text = *rtext;

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

  780.     unsigned argc = 0, i;

  781.     int ret;

  782. 

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

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

  785.         return AVERROR(EINVAL);

  786.     }

  787.     text++;

  788.     while (1) {

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

  790.             ret = AVERROR(ENOMEM);

  791.             goto end;

  792.         }

  793.         if (!*text) {

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

  795.             ret = AVERROR(EINVAL);

  796.             goto end;

  797.         }

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

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

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

  801.             break;

  802.         text++;

  803.     }

  804. 

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

  806.         goto end;

  807.     ret = 0;

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

  809. 

  810. end:

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

  812.         av_freep(&argv[i]);

  813.     return ret;

  814. }

  815. 

  816. static int expand_text(AVFilterContext *ctx)

  817. {

  818.     DrawTextContext *s = ctx->priv;

  819.     char *text = s->text;

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

  821.     int ret;

  822. 

  823.     av_bprint_clear(bp);

  824.     while (*text) {

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

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

  827.             text += 2;

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

  829.             text++;

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

  831.                 return ret;

  832.         } else {

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

  834.             text++;

  835.         }

  836.     }

  837.     if (!av_bprint_is_complete(bp))

  838.         return AVERROR(ENOMEM);

  839.     return 0;

  840. }

  841. 

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

  843.                        int width, int height, const uint8_t rgbcolor[4],

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

  845. {

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

  847.     uint32_t code = 0;

  848.     int i, x1, y1;

  849.     uint8_t *p;

  850.     Glyph *glyph = NULL;

  851. 

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

  853.         FT_Bitmap bitmap;

  854.         Glyph dummy = { 0 };

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

  856. 

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

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

  859.             continue;

  860. 

  861.         dummy.code = code;

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

  863. 

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

  865. 

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

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

  868.             return AVERROR(EINVAL);

  869. 

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

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

  872. 

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

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

  875.                       bitmap.buffer, bitmap.pitch,

  876.                       bitmap.width, bitmap.rows,

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

  878.                       0, x1, y1);

  879.     }

  880. 

  881.     return 0;

  882. }

  883. 

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

  885.                      int width, int height)

  886. {

  887.     DrawTextContext *s = ctx->priv;

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

  889. 

  890.     uint32_t code = 0, prev_code = 0;

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

  892.     int max_text_line_w = 0, len;

  893.     int box_w, box_h;

  894.     char *text;

  895.     uint8_t *p;

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

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

  898.     FT_Vector delta;

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

  900.     Glyph dummy = { 0 };

  901. 

  902.     time_t now = time(0);

  903.     struct tm ltime;

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

  905. 

  906.     av_bprint_clear(bp);

  907. 

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

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

  910. 

  911.     switch (s->exp_mode) {

  912.     case EXP_NONE:

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

  914.         break;

  915.     case EXP_NORMAL:

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

  917.             return ret;

  918.         break;

  919.     case EXP_STRFTIME:

  920.         localtime_r(&now, &ltime);

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

  922.         break;

  923.     }

  924. 

  925.     if (s->tc_opt_string) {

  926.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

  928.         av_bprint_clear(bp);

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

  930.     }

  931. 

  932.     if (!av_bprint_is_complete(bp))

  933.         return AVERROR(ENOMEM);

  934.     text = s->expanded_text.str;

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

  936.         if (!(s->positions =

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

  938.             return AVERROR(ENOMEM);

  939.         s->nb_positions = len;

  940.     }

  941. 

  942.     x = 0;

  943.     y = 0;

  944. 

  945.     /* load and cache glyphs */

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

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

  948. 

  949.         /* get glyph */

  950.         dummy.code = code;

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

  952.         if (!glyph) {

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

  954.         }

  955. 

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

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

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

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

  960.     }

  961.     s->max_glyph_h = y_max - y_min;

  962.     s->max_glyph_w = x_max - x_min;

  963. 

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

  965.     glyph = NULL;

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

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

  968. 

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

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

  971.             continue;

  972. 

  973.         prev_code = code;

  974.         if (is_newline(code)) {

  975. 

  976.             max_text_line_w = FFMAX(max_text_line_w, x);

  977.             y += s->max_glyph_h;

  978.             x = 0;

  979.             continue;

  980.         }

  981. 

  982.         /* get glyph */

  983.         prev_glyph = glyph;

  984.         dummy.code = code;

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

  986. 

  987.         /* kerning */

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

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

  990.                            ft_kerning_default, &delta);

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

  992.         }

  993. 

  994.         /* save position */

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

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

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

  998.         else              x += glyph->advance;

  999.     }

  1000. 

  1001.     max_text_line_w = FFMAX(x, max_text_line_w);

  1002. 

  1003.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1004.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1005. 

  1006.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1007.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1008.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1009.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1010. 

  1011.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1012. 

  1013.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1014.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1015.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1016. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1017.     if (s->draw_pexpr){

  1018.     s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);

  1019. 

  1020.     if(!s->draw)

  1021.         return 0;

  1022.     }

  1023.     if (ctx->is_disabled)

  1024.         return 0;

  1025. #endif

  1026. 

  1027.     box_w = FFMIN(width - 1 , max_text_line_w);

  1028.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1029. 

  1030.     /* draw box */

  1031.     if (s->draw_box)

  1032.         ff_blend_rectangle(&s->dc, &s->boxcolor,

  1033.                            frame->data, frame->linesize, width, height,

  1034.                            s->x, s->y, box_w, box_h);

  1035. 

  1036.     if (s->shadowx || s->shadowy) {

  1037.         if ((ret = draw_glyphs(s, frame, width, height, s->shadowcolor.rgba,

  1038.                                &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1039.             return ret;

  1040.     }

  1041. 

  1042.     if (s->borderw) {

  1043.         if ((ret = draw_glyphs(s, frame, width, height, s->bordercolor.rgba,

  1044.                                &s->bordercolor, 0, 0, s->borderw)) < 0)

  1045.             return ret;

  1046.     }

  1047.     if ((ret = draw_glyphs(s, frame, width, height, s->fontcolor.rgba,

  1048.                            &s->fontcolor, 0, 0, 0)) < 0)

  1049.         return ret;

  1050. 

  1051.     return 0;

  1052. }

  1053. 

  1054. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1055. {

  1056.     AVFilterContext *ctx = inlink->dst;

  1057.     AVFilterLink *outlink = ctx->outputs[0];

  1058.     DrawTextContext *s = ctx->priv;

  1059.     int ret;

  1060. 

  1061.     if (s->reload)

  1062.         if ((ret = load_textfile(ctx)) < 0)

  1063.             return ret;

  1064. 

  1065.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;

  1066.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1067.         NAN : frame->pts * av_q2d(inlink->time_base);

  1068. 

  1069.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1070.     s->metadata = av_frame_get_metadata(frame);

  1071. 

  1072.     draw_text(ctx, frame, frame->width, frame->height);

  1073. 

  1074.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1075.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1076.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1077.            s->x, s->y);

  1078. 

  1079.     return ff_filter_frame(outlink, frame);

  1080. }

  1081. 

  1082. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1083.     {

  1084.         .name           = "default",

  1085.         .type           = AVMEDIA_TYPE_VIDEO,

  1086.         .filter_frame   = filter_frame,

  1087.         .config_props   = config_input,

  1088.         .needs_writable = 1,

  1089.     },

  1090.     { NULL }

  1091. };

  1092. 

  1093. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1094.     {

  1095.         .name = "default",

  1096.         .type = AVMEDIA_TYPE_VIDEO,

  1097.     },

  1098.     { NULL }

  1099. };

  1100. 

  1101. AVFilter ff_vf_drawtext = {

  1102.     .name          = "drawtext",

  1103.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1104.     .priv_size     = sizeof(DrawTextContext),

  1105.     .priv_class    = &drawtext_class,

  1106.     .init          = init,

  1107.     .uninit        = uninit,

  1108.     .query_formats = query_formats,

  1109.     .inputs        = avfilter_vf_drawtext_inputs,

  1110.     .outputs       = avfilter_vf_drawtext_outputs,

  1111.     .process_command = command,

  1112. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1113.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

  1114. #else

  1115.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1116. #endif

  1117. };