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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. #undef time

  51. 

  52. #include <ft2build.h>

  53. #include <freetype/config/ftheader.h>

  54. #include FT_FREETYPE_H

  55. #include FT_GLYPH_H

  56. #if CONFIG_FONTCONFIG

  57. #include <fontconfig/fontconfig.h>

  58. #endif

  59. 

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

  61.     "dar",

  62.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  71.     "sar",

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

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

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

  75.     "x",

  76.     "y",

  77.     NULL

  78. };

  79. 

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

  81.     "rand"

  82. };

  83. 

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

  85. {

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

  87. }

  88. 

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

  90. 

  91. static const eval_func2 fun2[] = {

  92.     drand,

  93.     NULL

  94. };

  95. 

  96. enum var_name {

  97.     VAR_DAR,

  98.     VAR_HSUB, VAR_VSUB,

  99.     VAR_LINE_H, VAR_LH,

  100.     VAR_MAIN_H, VAR_h, VAR_H,

  101.     VAR_MAIN_W, VAR_w, VAR_W,

  102.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  103.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  104.     VAR_MAX_GLYPH_H,

  105.     VAR_MAX_GLYPH_W,

  106.     VAR_N,

  107.     VAR_SAR,

  108.     VAR_T,

  109.     VAR_TEXT_H, VAR_TH,

  110.     VAR_TEXT_W, VAR_TW,

  111.     VAR_X,

  112.     VAR_Y,

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

  139.     char *fontcolor_string;         ///< font color as string

  140.     char *boxcolor_string;          ///< box color as string

  141.     char *shadowcolor_string;       ///< shadow color as string

  142. 

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

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

  145.     int tabsize;                    ///< tab size

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

  147. 

  148.     FFDrawContext dc;

  149.     FFDrawColor fontcolor;          ///< foreground color

  150.     FFDrawColor shadowcolor;        ///< shadow color

  151.     FFDrawColor boxcolor;           ///< background color

  152. 

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

  154.     FT_Face face;                   ///< freetype font face 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.     char   *draw_expr;              ///< expression for draw

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

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

  164.     AVLFG  prng;                    ///< random

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

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

  167.     AVTimecode  tc;                 ///< timecode context

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

  169.     int frame_id;

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

  171. } DrawTextContext;

  172. 

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

  174. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  175. 

  176. static const AVOption drawtext_options[]= {

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

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

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

  180. {"fontcolor",   "set foreground color", OFFSET(fontcolor_string),   AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

  181. {"boxcolor",    "set box color",        OFFSET(boxcolor_string),    AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},

  182. {"shadowcolor", "set shadow color",     OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

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

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

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

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

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

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

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

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

  191. {"draw",     "if false do not draw", OFFSET(draw_expr),          AV_OPT_TYPE_STRING, {.str="1"},   CHAR_MIN, CHAR_MAX, FLAGS},

  192. 

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

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

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

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

  197. 

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

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

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

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

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

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

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

  205. 

  206. /* FT_LOAD_* flags */

  207. {"ft_load_flags", "set font loading flags for libfreetype",   OFFSET(ft_load_flags),  AV_OPT_TYPE_FLAGS,  {.i64=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags"},

  208. {"default",                     "set default",                     0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  209. {"no_scale",                    "set no_scale",                    0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  210. {"no_hinting",                  "set no_hinting",                  0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  211. {"render",                      "set render",                      0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  212. {"no_bitmap",                   "set no_bitmap",                   0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  213. {"vertical_layout",             "set vertical_layout",             0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  214. {"force_autohint",              "set force_autohint",              0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  215. {"crop_bitmap",                 "set crop_bitmap",                 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  216. {"pedantic",                    "set pedantic",                    0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  217. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  218. {"no_recurse",                  "set no_recurse",                  0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  219. {"ignore_transform",            "set ignore_transform",            0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  220. {"monochrome",                  "set monochrome",                  0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  221. {"linear_design",               "set linear_design",               0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  222. {"no_autohint",                 "set no_autohint",                 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},

  223. {NULL},

  224. };

  225. 

  226. AVFILTER_DEFINE_CLASS(drawtext);

  227. 

  228. #undef __FTERRORS_H__

  229. #define FT_ERROR_START_LIST {

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

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

  232. 

  233. struct ft_error

  234. {

  235.     int err;

  236.     const char *err_msg;

  237. } static ft_errors[] =

  238. #include FT_ERRORS_H

  239. 

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

  241. 

  242. typedef struct {

  243.     FT_Glyph *glyph;

  244.     uint32_t code;

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

  246.     FT_BBox bbox;

  247.     int advance;

  248.     int bitmap_left;

  249.     int bitmap_top;

  250. } Glyph;

  251. 

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

  253. {

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

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

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

  257. }

  258. 

  259. /**

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

  261.  */

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

  263. {

  264.     DrawTextContext *dtext = ctx->priv;

  265.     Glyph *glyph;

  266.     struct AVTreeNode *node = NULL;

  267.     int ret;

  268. 

  269.     /* load glyph into dtext->face->glyph */

  270.     if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))

  271.         return AVERROR(EINVAL);

  272. 

  273.     /* save glyph */

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

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

  276.         ret = AVERROR(ENOMEM);

  277.         goto error;

  278.     }

  279.     glyph->code  = code;

  280. 

  281.     if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {

  282.         ret = AVERROR(EINVAL);

  283.         goto error;

  284.     }

  285. 

  286.     glyph->bitmap      = dtext->face->glyph->bitmap;

  287.     glyph->bitmap_left = dtext->face->glyph->bitmap_left;

  288.     glyph->bitmap_top  = dtext->face->glyph->bitmap_top;

  289.     glyph->advance     = dtext->face->glyph->advance.x >> 6;

  290. 

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

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

  293. 

  294.     /* cache the newly created glyph */

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

  296.         ret = AVERROR(ENOMEM);

  297.         goto error;

  298.     }

  299.     av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);

  300. 

  301.     if (glyph_ptr)

  302.         *glyph_ptr = glyph;

  303.     return 0;

  304. 

  305. error:

  306.     if (glyph)

  307.         av_freep(&glyph->glyph);

  308.     av_freep(&glyph);

  309.     av_freep(&node);

  310.     return ret;

  311. }

  312. 

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

  314.                           const char **error)

  315. {

  316.     DrawTextContext *dtext = ctx->priv;

  317.     int err;

  318. 

  319.     err = FT_New_Face(dtext->library, path, index, &dtext->face);

  320.     if (err) {

  321.         *error = FT_ERRMSG(err);

  322.         return AVERROR(EINVAL);

  323.     }

  324.     return 0;

  325. }

  326. 

  327. #if CONFIG_FONTCONFIG

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

  329. {

  330.     DrawTextContext *dtext = ctx->priv;

  331.     FcConfig *fontconfig;

  332.     FcPattern *pattern, *fpat;

  333.     FcResult result = FcResultMatch;

  334.     FcChar8 *filename;

  335.     int err, index;

  336.     double size;

  337. 

  338.     fontconfig = FcInitLoadConfigAndFonts();

  339.     if (!fontconfig) {

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

  341.         return AVERROR(EINVAL);

  342.     }

  343.     pattern = FcNameParse(dtext->fontfile ? dtext->fontfile :

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

  345.     if (!pattern) {

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

  347.         return AVERROR(EINVAL);

  348.     }

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

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

  351.         return AVERROR(EINVAL);

  352.     }

  353.     FcDefaultSubstitute(pattern);

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

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

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

  357.         return AVERROR(EINVAL);

  358.     }

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

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

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

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

  363.         return AVERROR(EINVAL);

  364.     }

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

  366.     if (!dtext->fontsize)

  367.         dtext->fontsize = size + 0.5;

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

  369.     if (err)

  370.         return err;

  371.     FcPatternDestroy(fpat);

  372.     FcPatternDestroy(pattern);

  373.     FcConfigDestroy(fontconfig);

  374.     return 0;

  375. }

  376. #endif

  377. 

  378. static int load_font(AVFilterContext *ctx)

  379. {

  380.     DrawTextContext *dtext = ctx->priv;

  381.     int err;

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

  383. 

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

  385.     err = load_font_file(ctx, dtext->fontfile, 0, &error);

  386.     if (!err)

  387.         return 0;

  388. #if CONFIG_FONTCONFIG

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

  390.     if (!err)

  391.         return 0;

  392. #endif

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

  394.            dtext->fontfile, error);

  395.     return err;

  396. }

  397. 

  398. static int load_textfile(AVFilterContext *ctx)

  399. {

  400.     DrawTextContext *dtext = ctx->priv;

  401.     int err;

  402.     uint8_t *textbuf;

  403.     size_t textbuf_size;

  404. 

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

  406.         av_log(ctx, AV_LOG_ERROR,

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

  408.                dtext->textfile);

  409.         return err;

  410.     }

  411. 

  412.     if (!(dtext->text = av_realloc(dtext->text, textbuf_size + 1)))

  413.         return AVERROR(ENOMEM);

  414.     memcpy(dtext->text, textbuf, textbuf_size);

  415.     dtext->text[textbuf_size] = 0;

  416.     av_file_unmap(textbuf, textbuf_size);

  417. 

  418.     return 0;

  419. }

  420. 

  421. static av_cold int init(AVFilterContext *ctx, const char *args)

  422. {

  423.     int err;

  424.     DrawTextContext *dtext = ctx->priv;

  425.     Glyph *glyph;

  426. 

  427.     dtext->class = &drawtext_class;

  428.     av_opt_set_defaults(dtext);

  429. 

  430.     if ((err = av_set_options_string(dtext, args, "=", ":")) < 0)

  431.         return err;

  432. 

  433.     if (!dtext->fontfile && !CONFIG_FONTCONFIG) {

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

  435.         return AVERROR(EINVAL);

  436.     }

  437. 

  438.     if (dtext->textfile) {

  439.         if (dtext->text) {

  440.             av_log(ctx, AV_LOG_ERROR,

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

  442.             return AVERROR(EINVAL);

  443.         }

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

  445.             return err;

  446.     }

  447. 

  448.     if (dtext->reload && !dtext->textfile)

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

  450. 

  451.     if (dtext->tc_opt_string) {

  452.         int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,

  453.                                                dtext->tc_opt_string, ctx);

  454.         if (ret < 0)

  455.             return ret;

  456.         if (dtext->tc24hmax)

  457.             dtext->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;

  458.         if (!dtext->text)

  459.             dtext->text = av_strdup("");

  460.     }

  461. 

  462.     if (!dtext->text) {

  463.         av_log(ctx, AV_LOG_ERROR,

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

  465.         return AVERROR(EINVAL);

  466.     }

  467. 

  468.     if ((err = av_parse_color(dtext->fontcolor.rgba, dtext->fontcolor_string, -1, ctx))) {

  469.         av_log(ctx, AV_LOG_ERROR,

  470.                "Invalid font color '%s'\n", dtext->fontcolor_string);

  471.         return err;

  472.     }

  473. 

  474.     if ((err = av_parse_color(dtext->boxcolor.rgba, dtext->boxcolor_string, -1, ctx))) {

  475.         av_log(ctx, AV_LOG_ERROR,

  476.                "Invalid box color '%s'\n", dtext->boxcolor_string);

  477.         return err;

  478.     }

  479. 

  480.     if ((err = av_parse_color(dtext->shadowcolor.rgba, dtext->shadowcolor_string, -1, ctx))) {

  481.         av_log(ctx, AV_LOG_ERROR,

  482.                "Invalid shadow color '%s'\n", dtext->shadowcolor_string);

  483.         return err;

  484.     }

  485. 

  486.     if ((err = FT_Init_FreeType(&(dtext->library)))) {

  487.         av_log(ctx, AV_LOG_ERROR,

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

  489.         return AVERROR(EINVAL);

  490.     }

  491. 

  492.     err = load_font(ctx);

  493.     if (err)

  494.         return err;

  495.     if (!dtext->fontsize)

  496.         dtext->fontsize = 16;

  497.     if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {

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

  499.                dtext->fontsize, FT_ERRMSG(err));

  500.         return AVERROR(EINVAL);

  501.     }

  502. 

  503.     dtext->use_kerning = FT_HAS_KERNING(dtext->face);

  504. 

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

  506.     load_glyph(ctx, NULL, 0);

  507. 

  508.     /* set the tabsize in pixels */

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

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

  511.         return err;

  512.     }

  513.     dtext->tabsize *= glyph->advance;

  514. 

  515.     if (dtext->exp_mode == EXP_STRFTIME &&

  516.         (strchr(dtext->text, '%') || strchr(dtext->text, '\\')))

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

  518. 

  519.     av_bprint_init(&dtext->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);

  520. 

  521.     return 0;

  522. }

  523. 

  524. static int query_formats(AVFilterContext *ctx)

  525. {

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

  527.     return 0;

  528. }

  529. 

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

  531. {

  532.     Glyph *glyph = elem;

  533. 

  534.     FT_Done_Glyph(*glyph->glyph);

  535.     av_freep(&glyph->glyph);

  536.     av_free(elem);

  537.     return 0;

  538. }

  539. 

  540. static av_cold void uninit(AVFilterContext *ctx)

  541. {

  542.     DrawTextContext *dtext = ctx->priv;

  543. 

  544.     av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;

  545.     av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;

  546.     av_expr_free(dtext->draw_pexpr); dtext->draw_pexpr = NULL;

  547.     av_opt_free(dtext);

  548. 

  549.     av_freep(&dtext->positions);

  550.     dtext->nb_positions = 0;

  551. 

  552.     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);

  553.     av_tree_destroy(dtext->glyphs);

  554.     dtext->glyphs = NULL;

  555. 

  556.     FT_Done_Face(dtext->face);

  557.     FT_Done_FreeType(dtext->library);

  558. 

  559.     av_bprint_finalize(&dtext->expanded_text, NULL);

  560. }

  561. 

  562. static inline int is_newline(uint32_t c)

  563. {

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

  565. }

  566. 

  567. static int config_input(AVFilterLink *inlink)

  568. {

  569.     AVFilterContext *ctx = inlink->dst;

  570.     DrawTextContext *dtext = ctx->priv;

  571.     int ret;

  572. 

  573.     ff_draw_init(&dtext->dc, inlink->format, 0);

  574.     ff_draw_color(&dtext->dc, &dtext->fontcolor,   dtext->fontcolor.rgba);

  575.     ff_draw_color(&dtext->dc, &dtext->shadowcolor, dtext->shadowcolor.rgba);

  576.     ff_draw_color(&dtext->dc, &dtext->boxcolor,    dtext->boxcolor.rgba);

  577. 

  578.     dtext->var_values[VAR_w]     = dtext->var_values[VAR_W]     = dtext->var_values[VAR_MAIN_W] = inlink->w;

  579.     dtext->var_values[VAR_h]     = dtext->var_values[VAR_H]     = dtext->var_values[VAR_MAIN_H] = inlink->h;

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

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

  582.     dtext->var_values[VAR_HSUB]  = 1 << dtext->dc.hsub_max;

  583.     dtext->var_values[VAR_VSUB]  = 1 << dtext->dc.vsub_max;

  584.     dtext->var_values[VAR_X]     = NAN;

  585.     dtext->var_values[VAR_Y]     = NAN;

  586.     if (!dtext->reinit)

  587.         dtext->var_values[VAR_N] = 0;

  588.     dtext->var_values[VAR_T]     = NAN;

  589. 

  590.     av_lfg_init(&dtext->prng, av_get_random_seed());

  591. 

  592.     if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,

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

  594.         (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,

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

  596.         (ret = av_expr_parse(&dtext->draw_pexpr, dtext->draw_expr, var_names,

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

  598. 

  599.         return AVERROR(EINVAL);

  600. 

  601.     return 0;

  602. }

  603. 

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

  605. {

  606.     DrawTextContext *dtext = ctx->priv;

  607. 

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

  609.         int ret;

  610.         uninit(ctx);

  611.         dtext->reinit = 1;

  612.         if ((ret = init(ctx, arg)) < 0)

  613.             return ret;

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

  615.     }

  616. 

  617.     return AVERROR(ENOSYS);

  618. }

  619. 

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

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

  622. {

  623.     DrawTextContext *dtext = ctx->priv;

  624. 

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

  626.     return 0;

  627. }

  628. 

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

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

  631. {

  632.     DrawTextContext *dtext = ctx->priv;

  633. 

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

  635.     return 0;

  636. }

  637. 

  638. #if !HAVE_LOCALTIME_R

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

  640. {

  641.     *tm = *localtime(t);

  642. }

  643. #endif

  644. 

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

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

  647. {

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

  649.     time_t now;

  650.     struct tm tm;

  651. 

  652.     time(&now);

  653.     if (tag == 'L')

  654.         localtime_r(&now, &tm);

  655.     else

  656.         tm = *gmtime(&now);

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

  658.     return 0;

  659. }

  660. 

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

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

  663. {

  664.     DrawTextContext *dtext = ctx->priv;

  665.     double res;

  666.     int ret;

  667. 

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

  669.                                  NULL, NULL, fun2_names, fun2,

  670.                                  &dtext->prng, 0, ctx);

  671.     if (ret < 0)

  672.         av_log(ctx, AV_LOG_ERROR,

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

  674.                argv[0]);

  675.     else

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

  677. 

  678.     return ret;

  679. }

  680. 

  681. static const struct drawtext_function {

  682.     const char *name;

  683.     unsigned argc_min, argc_max;

  684.     int tag; /** opaque argument to func */

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

  686. } functions[] = {

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

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

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

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

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

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

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

  694. };

  695. 

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

  697.                          unsigned argc, char **argv)

  698. {

  699.     unsigned i;

  700. 

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

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

  703.             continue;

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

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

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

  707.             return AVERROR(EINVAL);

  708.         }

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

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

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

  712.             return AVERROR(EINVAL);

  713.         }

  714.         break;

  715.     }

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

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

  718.         return AVERROR(EINVAL);

  719.     }

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

  721. }

  722. 

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

  724. {

  725.     const char *text = *rtext;

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

  727.     unsigned argc = 0, i;

  728.     int ret;

  729. 

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

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

  732.         return AVERROR(EINVAL);

  733.     }

  734.     text++;

  735.     while (1) {

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

  737.             ret = AVERROR(ENOMEM);

  738.             goto end;

  739.         }

  740.         if (!*text) {

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

  742.             ret = AVERROR(EINVAL);

  743.             goto end;

  744.         }

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

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

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

  748.             break;

  749.         text++;

  750.     }

  751. 

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

  753.         goto end;

  754.     ret = 0;

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

  756. 

  757. end:

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

  759.         av_freep(&argv[i]);

  760.     return ret;

  761. }

  762. 

  763. static int expand_text(AVFilterContext *ctx)

  764. {

  765.     DrawTextContext *dtext = ctx->priv;

  766.     char *text = dtext->text;

  767.     AVBPrint *bp = &dtext->expanded_text;

  768.     int ret;

  769. 

  770.     av_bprint_clear(bp);

  771.     while (*text) {

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

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

  774.             text += 2;

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

  776.             text++;

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

  778.                 return ret;

  779.         } else {

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

  781.             text++;

  782.         }

  783.     }

  784.     if (!av_bprint_is_complete(bp))

  785.         return AVERROR(ENOMEM);

  786.     return 0;

  787. }

  788. 

  789. static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,

  790.                        int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)

  791. {

  792.     char *text = dtext->expanded_text.str;

  793.     uint32_t code = 0;

  794.     int i, x1, y1;

  795.     uint8_t *p;

  796.     Glyph *glyph = NULL;

  797. 

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

  799.         Glyph dummy = { 0 };

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

  801. 

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

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

  804.             continue;

  805. 

  806.         dummy.code = code;

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

  808. 

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

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

  811.             return AVERROR(EINVAL);

  812. 

  813.         x1 = dtext->positions[i].x+dtext->x+x;

  814.         y1 = dtext->positions[i].y+dtext->y+y;

  815. 

  816.         ff_blend_mask(&dtext->dc, color,

  817.                       picref->data, picref->linesize, width, height,

  818.                       glyph->bitmap.buffer, glyph->bitmap.pitch,

  819.                       glyph->bitmap.width, glyph->bitmap.rows,

  820.                       glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  821.                       0, x1, y1);

  822.     }

  823. 

  824.     return 0;

  825. }

  826. 

  827. static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,

  828.                      int width, int height)

  829. {

  830.     DrawTextContext *dtext = ctx->priv;

  831.     uint32_t code = 0, prev_code = 0;

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

  833.     int max_text_line_w = 0, len;

  834.     int box_w, box_h;

  835.     char *text = dtext->text;

  836.     uint8_t *p;

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

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

  839.     FT_Vector delta;

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

  841.     Glyph dummy = { 0 };

  842. 

  843.     time_t now = time(0);

  844.     struct tm ltime;

  845.     AVBPrint *bp = &dtext->expanded_text;

  846. 

  847.     av_bprint_clear(bp);

  848. 

  849.     if(dtext->basetime != AV_NOPTS_VALUE)

  850.         now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;

  851. 

  852.     switch (dtext->exp_mode) {

  853.     case EXP_NONE:

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

  855.         break;

  856.     case EXP_NORMAL:

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

  858.             return ret;

  859.         break;

  860.     case EXP_STRFTIME:

  861.         localtime_r(&now, &ltime);

  862.         av_bprint_strftime(bp, dtext->text, &ltime);

  863.         break;

  864.     }

  865. 

  866.     if (dtext->tc_opt_string) {

  867.         char tcbuf[AV_TIMECODE_STR_SIZE];

  868.         av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);

  869.         av_bprint_clear(bp);

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

  871.     }

  872. 

  873.     if (!av_bprint_is_complete(bp))

  874.         return AVERROR(ENOMEM);

  875.     text = dtext->expanded_text.str;

  876.     if ((len = dtext->expanded_text.len) > dtext->nb_positions) {

  877.         if (!(dtext->positions =

  878.               av_realloc(dtext->positions, len*sizeof(*dtext->positions))))

  879.             return AVERROR(ENOMEM);

  880.         dtext->nb_positions = len;

  881.     }

  882. 

  883.     x = 0;

  884.     y = 0;

  885. 

  886.     /* load and cache glyphs */

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

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

  889. 

  890.         /* get glyph */

  891.         dummy.code = code;

  892.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  893.         if (!glyph) {

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

  895.         }

  896. 

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

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

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

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

  901.     }

  902.     dtext->max_glyph_h = y_max - y_min;

  903.     dtext->max_glyph_w = x_max - x_min;

  904. 

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

  906.     glyph = NULL;

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

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

  909. 

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

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

  912.             continue;

  913. 

  914.         prev_code = code;

  915.         if (is_newline(code)) {

  916.             max_text_line_w = FFMAX(max_text_line_w, x);

  917.             y += dtext->max_glyph_h;

  918.             x = 0;

  919.             continue;

  920.         }

  921. 

  922.         /* get glyph */

  923.         prev_glyph = glyph;

  924.         dummy.code = code;

  925.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  926. 

  927.         /* kerning */

  928.         if (dtext->use_kerning && prev_glyph && glyph->code) {

  929.             FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,

  930.                            ft_kerning_default, &delta);

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

  932.         }

  933. 

  934.         /* save position */

  935.         dtext->positions[i].x = x + glyph->bitmap_left;

  936.         dtext->positions[i].y = y - glyph->bitmap_top + y_max;

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

  938.         else              x += glyph->advance;

  939.     }

  940. 

  941.     max_text_line_w = FFMAX(x, max_text_line_w);

  942. 

  943.     dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;

  944.     dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;

  945. 

  946.     dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;

  947.     dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;

  948.     dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;

  949.     dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;

  950. 

  951.     dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;

  952. 

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

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

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

  956.     dtext->draw = av_expr_eval(dtext->draw_pexpr, dtext->var_values, &dtext->prng);

  957. 

  958.     if(!dtext->draw)

  959.         return 0;

  960. 

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

  962.     box_h = FFMIN(height - 1, y + dtext->max_glyph_h);

  963. 

  964.     /* draw box */

  965.     if (dtext->draw_box)

  966.         ff_blend_rectangle(&dtext->dc, &dtext->boxcolor,

  967.                            picref->data, picref->linesize, width, height,

  968.                            dtext->x, dtext->y, box_w, box_h);

  969. 

  970.     if (dtext->shadowx || dtext->shadowy) {

  971.         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor.rgba,

  972.                                &dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)

  973.             return ret;

  974.     }

  975. 

  976.     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor.rgba,

  977.                            &dtext->fontcolor, 0, 0)) < 0)

  978.         return ret;

  979. 

  980.     return 0;

  981. }

  982. 

  983. static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)

  984. {

  985.     AVFilterContext *ctx = inlink->dst;

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

  987.     DrawTextContext *dtext = ctx->priv;

  988.     int ret;

  989. 

  990.     if (dtext->reload)

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

  992.             return ret;

  993. 

  994.     dtext->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

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

  996. 

  997.     draw_text(ctx, frame, frame->video->w, frame->video->h);

  998. 

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

  1000.            (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],

  1001.            (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],

  1002.            dtext->x, dtext->y);

  1003. 

  1004.     dtext->var_values[VAR_N] += 1.0;

  1005. 

  1006.     return ff_filter_frame(inlink->dst->outputs[0], frame);

  1007. }

  1008. 

  1009. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1010.     {

  1011.         .name             = "default",

  1012.         .type             = AVMEDIA_TYPE_VIDEO,

  1013.         .get_video_buffer = ff_null_get_video_buffer,

  1014.         .filter_frame     = filter_frame,

  1015.         .config_props     = config_input,

  1016.         .min_perms        = AV_PERM_WRITE |

  1017.                             AV_PERM_READ,

  1018.     },

  1019.     { NULL }

  1020. };

  1021. 

  1022. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1023.     {

  1024.         .name = "default",

  1025.         .type = AVMEDIA_TYPE_VIDEO,

  1026.     },

  1027.     { NULL }

  1028. };

  1029. 

  1030. AVFilter avfilter_vf_drawtext = {

  1031.     .name          = "drawtext",

  1032.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1033.     .priv_size     = sizeof(DrawTextContext),

  1034.     .init          = init,

  1035.     .uninit        = uninit,

  1036.     .query_formats = query_formats,

  1037. 

  1038.     .inputs    = avfilter_vf_drawtext_inputs,

  1039.     .outputs   = avfilter_vf_drawtext_outputs,

  1040.     .process_command = command,

  1041.     .priv_class = &drawtext_class,

  1042. };