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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. } DrawTextContext;

  171. 

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

  173. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  174. 

  175. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  191. 

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

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

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

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

  196. 

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

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

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

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

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

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

  203. 

  204. /* FT_LOAD_* flags */

  205. {"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"},

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

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

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

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

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

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

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

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

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

  215. {"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"},

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

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

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

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

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

  221. {NULL},

  222. };

  223. 

  224. AVFILTER_DEFINE_CLASS(drawtext);

  225. 

  226. #undef __FTERRORS_H__

  227. #define FT_ERROR_START_LIST {

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

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

  230. 

  231. struct ft_error

  232. {

  233.     int err;

  234.     const char *err_msg;

  235. } static ft_errors[] =

  236. #include FT_ERRORS_H

  237. 

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

  239. 

  240. typedef struct {

  241.     FT_Glyph *glyph;

  242.     uint32_t code;

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

  244.     FT_BBox bbox;

  245.     int advance;

  246.     int bitmap_left;

  247.     int bitmap_top;

  248. } Glyph;

  249. 

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

  251. {

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

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

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

  255. }

  256. 

  257. /**

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

  259.  */

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

  261. {

  262.     DrawTextContext *dtext = ctx->priv;

  263.     Glyph *glyph;

  264.     struct AVTreeNode *node = NULL;

  265.     int ret;

  266. 

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

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

  269.         return AVERROR(EINVAL);

  270. 

  271.     /* save glyph */

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

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

  274.         ret = AVERROR(ENOMEM);

  275.         goto error;

  276.     }

  277.     glyph->code  = code;

  278. 

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

  280.         ret = AVERROR(EINVAL);

  281.         goto error;

  282.     }

  283. 

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

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

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

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

  288. 

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

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

  291. 

  292.     /* cache the newly created glyph */

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

  294.         ret = AVERROR(ENOMEM);

  295.         goto error;

  296.     }

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

  298. 

  299.     if (glyph_ptr)

  300.         *glyph_ptr = glyph;

  301.     return 0;

  302. 

  303. error:

  304.     if (glyph)

  305.         av_freep(&glyph->glyph);

  306.     av_freep(&glyph);

  307.     av_freep(&node);

  308.     return ret;

  309. }

  310. 

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

  312.                           const char **error)

  313. {

  314.     DrawTextContext *dtext = ctx->priv;

  315.     int err;

  316. 

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

  318.     if (err) {

  319.         *error = FT_ERRMSG(err);

  320.         return AVERROR(EINVAL);

  321.     }

  322.     return 0;

  323. }

  324. 

  325. #if CONFIG_FONTCONFIG

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

  327. {

  328.     DrawTextContext *dtext = ctx->priv;

  329.     FcConfig *fontconfig;

  330.     FcPattern *pattern, *fpat;

  331.     FcResult result = FcResultMatch;

  332.     FcChar8 *filename;

  333.     int err, index;

  334.     double size;

  335. 

  336.     fontconfig = FcInitLoadConfigAndFonts();

  337.     if (!fontconfig) {

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

  339.         return AVERROR(EINVAL);

  340.     }

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

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

  343.     if (!pattern) {

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

  345.         return AVERROR(EINVAL);

  346.     }

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

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

  349.         return AVERROR(EINVAL);

  350.     }

  351.     FcDefaultSubstitute(pattern);

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

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

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

  355.         return AVERROR(EINVAL);

  356.     }

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

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

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

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

  361.         return AVERROR(EINVAL);

  362.     }

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

  364.     if (!dtext->fontsize)

  365.         dtext->fontsize = size + 0.5;

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

  367.     if (err)

  368.         return err;

  369.     FcPatternDestroy(fpat);

  370.     FcPatternDestroy(pattern);

  371.     FcConfigDestroy(fontconfig);

  372.     return 0;

  373. }

  374. #endif

  375. 

  376. static int load_font(AVFilterContext *ctx)

  377. {

  378.     DrawTextContext *dtext = ctx->priv;

  379.     int err;

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

  381. 

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

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

  384.     if (!err)

  385.         return 0;

  386. #if CONFIG_FONTCONFIG

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

  388.     if (!err)

  389.         return 0;

  390. #endif

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

  392.            dtext->fontfile, error);

  393.     return err;

  394. }

  395. 

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

  397. {

  398.     int err;

  399.     DrawTextContext *dtext = ctx->priv;

  400.     Glyph *glyph;

  401. 

  402.     dtext->class = &drawtext_class;

  403.     av_opt_set_defaults(dtext);

  404. 

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

  406.         return err;

  407. 

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

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

  410.         return AVERROR(EINVAL);

  411.     }

  412. 

  413.     if (dtext->textfile) {

  414.         uint8_t *textbuf;

  415.         size_t textbuf_size;

  416. 

  417.         if (dtext->text) {

  418.             av_log(ctx, AV_LOG_ERROR,

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

  420.             return AVERROR(EINVAL);

  421.         }

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

  423.             av_log(ctx, AV_LOG_ERROR,

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

  425.                    dtext->textfile);

  426.             return err;

  427.         }

  428. 

  429.         if (!(dtext->text = av_malloc(textbuf_size+1)))

  430.             return AVERROR(ENOMEM);

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

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

  433.         av_file_unmap(textbuf, textbuf_size);

  434.     }

  435. 

  436.     if (dtext->tc_opt_string) {

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

  438.                                                dtext->tc_opt_string, ctx);

  439.         if (ret < 0)

  440.             return ret;

  441.         if (dtext->tc24hmax)

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

  443.         if (!dtext->text)

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

  445.     }

  446. 

  447.     if (!dtext->text) {

  448.         av_log(ctx, AV_LOG_ERROR,

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

  450.         return AVERROR(EINVAL);

  451.     }

  452. 

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

  454.         av_log(ctx, AV_LOG_ERROR,

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

  456.         return err;

  457.     }

  458. 

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

  460.         av_log(ctx, AV_LOG_ERROR,

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

  462.         return err;

  463.     }

  464. 

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

  466.         av_log(ctx, AV_LOG_ERROR,

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

  468.         return err;

  469.     }

  470. 

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

  472.         av_log(ctx, AV_LOG_ERROR,

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

  474.         return AVERROR(EINVAL);

  475.     }

  476. 

  477.     err = load_font(ctx);

  478.     if (err)

  479.         return err;

  480.     if (!dtext->fontsize)

  481.         dtext->fontsize = 16;

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

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

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

  485.         return AVERROR(EINVAL);

  486.     }

  487. 

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

  489. 

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

  491.     load_glyph(ctx, NULL, 0);

  492. 

  493.     /* set the tabsize in pixels */

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

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

  496.         return err;

  497.     }

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

  499. 

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

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

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

  503. 

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

  505. 

  506.     return 0;

  507. }

  508. 

  509. static int query_formats(AVFilterContext *ctx)

  510. {

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

  512.     return 0;

  513. }

  514. 

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

  516. {

  517.     Glyph *glyph = elem;

  518. 

  519.     FT_Done_Glyph(*glyph->glyph);

  520.     av_freep(&glyph->glyph);

  521.     av_free(elem);

  522.     return 0;

  523. }

  524. 

  525. static av_cold void uninit(AVFilterContext *ctx)

  526. {

  527.     DrawTextContext *dtext = ctx->priv;

  528. 

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

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

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

  532.     av_opt_free(dtext);

  533. 

  534.     av_freep(&dtext->positions);

  535.     dtext->nb_positions = 0;

  536. 

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

  538.     av_tree_destroy(dtext->glyphs);

  539.     dtext->glyphs = NULL;

  540. 

  541.     FT_Done_Face(dtext->face);

  542.     FT_Done_FreeType(dtext->library);

  543. 

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

  545. }

  546. 

  547. static inline int is_newline(uint32_t c)

  548. {

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

  550. }

  551. 

  552. static int config_input(AVFilterLink *inlink)

  553. {

  554.     AVFilterContext *ctx = inlink->dst;

  555.     DrawTextContext *dtext = ctx->priv;

  556.     int ret;

  557. 

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

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

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

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

  562. 

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

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

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

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

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

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

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

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

  571.     if (!dtext->reinit)

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

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

  574. 

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

  576. 

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

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

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

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

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

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

  583. 

  584.         return AVERROR(EINVAL);

  585. 

  586.     return 0;

  587. }

  588. 

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

  590. {

  591.     DrawTextContext *dtext = ctx->priv;

  592. 

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

  594.         int ret;

  595.         uninit(ctx);

  596.         dtext->reinit = 1;

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

  598.             return ret;

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

  600.     }

  601. 

  602.     return AVERROR(ENOSYS);

  603. }

  604. 

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

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

  607. {

  608.     DrawTextContext *dtext = ctx->priv;

  609. 

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

  611.     return 0;

  612. }

  613. 

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

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

  616. {

  617.     DrawTextContext *dtext = ctx->priv;

  618. 

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

  620.     return 0;

  621. }

  622. 

  623. #if !HAVE_LOCALTIME_R

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

  625. {

  626.     *tm = *localtime(t);

  627. }

  628. #endif

  629. 

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

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

  632. {

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

  634.     time_t now;

  635.     struct tm tm;

  636. 

  637.     time(&now);

  638.     if (tag == 'L')

  639.         localtime_r(&now, &tm);

  640.     else

  641.         tm = *gmtime(&now);

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

  643.     return 0;

  644. }

  645. 

  646. static const struct drawtext_function {

  647.     const char *name;

  648.     unsigned argc_min, argc_max;

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

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

  651. } functions[] = {

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

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

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

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

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

  657. };

  658. 

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

  660.                          unsigned argc, char **argv)

  661. {

  662.     unsigned i;

  663. 

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

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

  666.             continue;

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

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

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

  670.             return AVERROR(EINVAL);

  671.         }

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

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

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

  675.             return AVERROR(EINVAL);

  676.         }

  677.         break;

  678.     }

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

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

  681.         return AVERROR(EINVAL);

  682.     }

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

  684. }

  685. 

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

  687. {

  688.     const char *text = *rtext;

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

  690.     unsigned argc = 0, i;

  691.     int ret;

  692. 

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

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

  695.         return AVERROR(EINVAL);

  696.     }

  697.     text++;

  698.     while (1) {

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

  700.             ret = AVERROR(ENOMEM);

  701.             goto end;

  702.         }

  703.         if (!*text) {

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

  705.             ret = AVERROR(EINVAL);

  706.             goto end;

  707.         }

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

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

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

  711.             break;

  712.         text++;

  713.     }

  714. 

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

  716.         goto end;

  717.     ret = 0;

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

  719. 

  720. end:

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

  722.         av_freep(&argv[i]);

  723.     return ret;

  724. }

  725. 

  726. static int expand_text(AVFilterContext *ctx)

  727. {

  728.     DrawTextContext *dtext = ctx->priv;

  729.     char *text = dtext->text;

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

  731.     int ret;

  732. 

  733.     av_bprint_clear(bp);

  734.     while (*text) {

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

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

  737.             text += 2;

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

  739.             text++;

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

  741.                 return ret;

  742.         } else {

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

  744.             text++;

  745.         }

  746.     }

  747.     if (!av_bprint_is_complete(bp))

  748.         return AVERROR(ENOMEM);

  749.     return 0;

  750. }

  751. 

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

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

  754. {

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

  756.     uint32_t code = 0;

  757.     int i, x1, y1;

  758.     uint8_t *p;

  759.     Glyph *glyph = NULL;

  760. 

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

  762.         Glyph dummy = { 0 };

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

  764. 

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

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

  767.             continue;

  768. 

  769.         dummy.code = code;

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

  771. 

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

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

  774.             return AVERROR(EINVAL);

  775. 

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

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

  778. 

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

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

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

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

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

  784.                       0, x1, y1);

  785.     }

  786. 

  787.     return 0;

  788. }

  789. 

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

  791.                      int width, int height)

  792. {

  793.     DrawTextContext *dtext = ctx->priv;

  794.     uint32_t code = 0, prev_code = 0;

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

  796.     int max_text_line_w = 0, len;

  797.     int box_w, box_h;

  798.     char *text = dtext->text;

  799.     uint8_t *p;

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

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

  802.     FT_Vector delta;

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

  804.     Glyph dummy = { 0 };

  805. 

  806.     time_t now = time(0);

  807.     struct tm ltime;

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

  809. 

  810.     av_bprint_clear(bp);

  811. 

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

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

  814. 

  815.     switch (dtext->exp_mode) {

  816.     case EXP_NONE:

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

  818.         break;

  819.     case EXP_NORMAL:

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

  821.             return ret;

  822.         break;

  823.     case EXP_STRFTIME:

  824.         localtime_r(&now, &ltime);

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

  826.         break;

  827.     }

  828. 

  829.     if (dtext->tc_opt_string) {

  830.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

  832.         av_bprint_clear(bp);

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

  834.     }

  835. 

  836.     if (!av_bprint_is_complete(bp))

  837.         return AVERROR(ENOMEM);

  838.     text = dtext->expanded_text.str;

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

  840.         if (!(dtext->positions =

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

  842.             return AVERROR(ENOMEM);

  843.         dtext->nb_positions = len;

  844.     }

  845. 

  846.     x = 0;

  847.     y = 0;

  848. 

  849.     /* load and cache glyphs */

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

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

  852. 

  853.         /* get glyph */

  854.         dummy.code = code;

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

  856.         if (!glyph) {

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

  858.         }

  859. 

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

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

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

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

  864.     }

  865.     dtext->max_glyph_h = y_max - y_min;

  866.     dtext->max_glyph_w = x_max - x_min;

  867. 

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

  869.     glyph = NULL;

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

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

  872. 

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

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

  875.             continue;

  876. 

  877.         prev_code = code;

  878.         if (is_newline(code)) {

  879.             max_text_line_w = FFMAX(max_text_line_w, x);

  880.             y += dtext->max_glyph_h;

  881.             x = 0;

  882.             continue;

  883.         }

  884. 

  885.         /* get glyph */

  886.         prev_glyph = glyph;

  887.         dummy.code = code;

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

  889. 

  890.         /* kerning */

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

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

  893.                            ft_kerning_default, &delta);

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

  895.         }

  896. 

  897.         /* save position */

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

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

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

  901.         else              x += glyph->advance;

  902.     }

  903. 

  904.     max_text_line_w = FFMAX(x, max_text_line_w);

  905. 

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

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

  908. 

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

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

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

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

  913. 

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

  915. 

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

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

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

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

  920. 

  921.     if(!dtext->draw)

  922.         return 0;

  923. 

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

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

  926. 

  927.     /* draw box */

  928.     if (dtext->draw_box)

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

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

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

  932. 

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

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

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

  936.             return ret;

  937.     }

  938. 

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

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

  941.         return ret;

  942. 

  943.     return 0;

  944. }

  945. 

  946. static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)

  947. {

  948.     return 0;

  949. }

  950. 

  951. static int end_frame(AVFilterLink *inlink)

  952. {

  953.     AVFilterContext *ctx = inlink->dst;

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

  955.     DrawTextContext *dtext = ctx->priv;

  956.     AVFilterBufferRef *picref = inlink->cur_buf;

  957.     int ret;

  958. 

  959.     dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?

  960.         NAN : picref->pts * av_q2d(inlink->time_base);

  961. 

  962.     draw_text(ctx, picref, picref->video->w, picref->video->h);

  963. 

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

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

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

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

  968. 

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

  970. 

  971.     if ((ret = ff_draw_slice(outlink, 0, picref->video->h, 1)) < 0 ||

  972.         (ret = ff_end_frame(outlink)) < 0)

  973.         return ret;

  974.     return 0;

  975. }

  976. 

  977. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  978.     {

  979.         .name             = "default",

  980.         .type             = AVMEDIA_TYPE_VIDEO,

  981.         .get_video_buffer = ff_null_get_video_buffer,

  982.         .start_frame      = ff_null_start_frame,

  983.         .draw_slice       = null_draw_slice,

  984.         .end_frame        = end_frame,

  985.         .config_props     = config_input,

  986.         .min_perms        = AV_PERM_WRITE |

  987.                             AV_PERM_READ,

  988.     },

  989.     { NULL }

  990. };

  991. 

  992. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  993.     {

  994.         .name = "default",

  995.         .type = AVMEDIA_TYPE_VIDEO,

  996.     },

  997.     { NULL }

  998. };

  999. 

  1000. AVFilter avfilter_vf_drawtext = {

  1001.     .name          = "drawtext",

  1002.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1003.     .priv_size     = sizeof(DrawTextContext),

  1004.     .init          = init,

  1005.     .uninit        = uninit,

  1006.     .query_formats = query_formats,

  1007. 

  1008.     .inputs    = avfilter_vf_drawtext_inputs,

  1009.     .outputs   = avfilter_vf_drawtext_outputs,

  1010.     .process_command = command,

  1011.     .priv_class = &drawtext_class,

  1012. };