falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54900 Commits
32 Branches
824MB
Tree: fe328f0807
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'fe328f0807'
${ noResults }
FFmpeg/libavfilter/vf_drawtext.c

1046 lines
36KB
Raw Blame History 

  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 <freetype/config/ftheader.h>

  52. #include FT_FREETYPE_H

  53. #include FT_GLYPH_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.     unsigned int fontsize;          ///< font size to use

  139. 

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

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

  142.     int tabsize;                    ///< tab size

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

  144. 

  145.     FFDrawContext dc;

  146.     FFDrawColor fontcolor;          ///< foreground color

  147.     FFDrawColor shadowcolor;        ///< shadow color

  148.     FFDrawColor boxcolor;           ///< background color

  149. 

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

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

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

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

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

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

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

  157.     double var_values[VAR_VARS_NB];

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

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

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

  161.     AVLFG  prng;                    ///< random

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

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

  164.     AVTimecode  tc;                 ///< timecode context

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

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

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

  168.     AVDictionary *metadata;

  169. } DrawTextContext;

  170. 

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

  172. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  173. 

  174. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  190. 

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

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

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

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

  195. 

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

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

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

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

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

  201.     {"reload",     "reload text file for each frame",                       OFFSET(reload),     AV_OPT_TYPE_INT, {.i64=0}, 0, 1, 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.     {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},

  204. 

  205.     /* FT_LOAD_* flags */

  206.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  222.     { NULL},

  223. };

  224. 

  225. AVFILTER_DEFINE_CLASS(drawtext);

  226. 

  227. #undef __FTERRORS_H__

  228. #define FT_ERROR_START_LIST {

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

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

  231. 

  232. struct ft_error

  233. {

  234.     int err;

  235.     const char *err_msg;

  236. } static ft_errors[] =

  237. #include FT_ERRORS_H

  238. 

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

  240. 

  241. typedef struct {

  242.     FT_Glyph *glyph;

  243.     uint32_t code;

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

  245.     FT_BBox bbox;

  246.     int advance;

  247.     int bitmap_left;

  248.     int bitmap_top;

  249. } Glyph;

  250. 

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

  252. {

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

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

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

  256. }

  257. 

  258. /**

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

  260.  */

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

  262. {

  263.     DrawTextContext *s = ctx->priv;

  264.     Glyph *glyph;

  265.     struct AVTreeNode *node = NULL;

  266.     int ret;

  267. 

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

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

  270.         return AVERROR(EINVAL);

  271. 

  272.     /* save glyph */

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

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

  275.         ret = AVERROR(ENOMEM);

  276.         goto error;

  277.     }

  278.     glyph->code  = code;

  279. 

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

  281.         ret = AVERROR(EINVAL);

  282.         goto error;

  283.     }

  284. 

  285.     glyph->bitmap      = s->face->glyph->bitmap;

  286.     glyph->bitmap_left = s->face->glyph->bitmap_left;

  287.     glyph->bitmap_top  = s->face->glyph->bitmap_top;

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

  289. 

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

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

  292. 

  293.     /* cache the newly created glyph */

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

  295.         ret = AVERROR(ENOMEM);

  296.         goto error;

  297.     }

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

  299. 

  300.     if (glyph_ptr)

  301.         *glyph_ptr = glyph;

  302.     return 0;

  303. 

  304. error:

  305.     if (glyph)

  306.         av_freep(&glyph->glyph);

  307.     av_freep(&glyph);

  308.     av_freep(&node);

  309.     return ret;

  310. }

  311. 

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

  313.                           const char **error)

  314. {

  315.     DrawTextContext *s = ctx->priv;

  316.     int err;

  317. 

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

  319.     if (err) {

  320.         *error = FT_ERRMSG(err);

  321.         return AVERROR(EINVAL);

  322.     }

  323.     return 0;

  324. }

  325. 

  326. #if CONFIG_FONTCONFIG

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

  328. {

  329.     DrawTextContext *s = ctx->priv;

  330.     FcConfig *fontconfig;

  331.     FcPattern *pattern, *fpat;

  332.     FcResult result = FcResultMatch;

  333.     FcChar8 *filename;

  334.     int err, index;

  335.     double size;

  336. 

  337.     fontconfig = FcInitLoadConfigAndFonts();

  338.     if (!fontconfig) {

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

  340.         return AVERROR(EINVAL);

  341.     }

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

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

  344.     if (!pattern) {

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

  346.         return AVERROR(EINVAL);

  347.     }

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

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

  350.         return AVERROR(EINVAL);

  351.     }

  352.     FcDefaultSubstitute(pattern);

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

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

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

  356.         return AVERROR(EINVAL);

  357.     }

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

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

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

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

  362.         return AVERROR(EINVAL);

  363.     }

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

  365.     if (!s->fontsize)

  366.         s->fontsize = size + 0.5;

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

  368.     if (err)

  369.         return err;

  370.     FcPatternDestroy(fpat);

  371.     FcPatternDestroy(pattern);

  372.     FcConfigDestroy(fontconfig);

  373.     return 0;

  374. }

  375. #endif

  376. 

  377. static int load_font(AVFilterContext *ctx)

  378. {

  379.     DrawTextContext *s = ctx->priv;

  380.     int err;

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

  382. 

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

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

  385.     if (!err)

  386.         return 0;

  387. #if CONFIG_FONTCONFIG

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

  389.     if (!err)

  390.         return 0;

  391. #endif

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

  393.            s->fontfile, error);

  394.     return err;

  395. }

  396. 

  397. static int load_textfile(AVFilterContext *ctx)

  398. {

  399.     DrawTextContext *s = ctx->priv;

  400.     int err;

  401.     uint8_t *textbuf;

  402.     size_t textbuf_size;

  403. 

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

  405.         av_log(ctx, AV_LOG_ERROR,

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

  407.                s->textfile);

  408.         return err;

  409.     }

  410. 

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

  412.         return AVERROR(ENOMEM);

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

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

  415.     av_file_unmap(textbuf, textbuf_size);

  416. 

  417.     return 0;

  418. }

  419. 

  420. static av_cold int init(AVFilterContext *ctx)

  421. {

  422.     int err;

  423.     DrawTextContext *s = ctx->priv;

  424.     Glyph *glyph;

  425. 

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

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

  428.         return AVERROR(EINVAL);

  429.     }

  430. 

  431.     if (s->textfile) {

  432.         if (s->text) {

  433.             av_log(ctx, AV_LOG_ERROR,

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

  435.             return AVERROR(EINVAL);

  436.         }

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

  438.             return err;

  439.     }

  440. 

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

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

  443. 

  444.     if (s->tc_opt_string) {

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

  446.                                                s->tc_opt_string, ctx);

  447.         if (ret < 0)

  448.             return ret;

  449.         if (s->tc24hmax)

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

  451.         if (!s->text)

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

  453.     }

  454. 

  455.     if (!s->text) {

  456.         av_log(ctx, AV_LOG_ERROR,

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

  458.         return AVERROR(EINVAL);

  459.     }

  460. 

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

  462.         av_log(ctx, AV_LOG_ERROR,

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

  464.         return AVERROR(EINVAL);

  465.     }

  466. 

  467.     err = load_font(ctx);

  468.     if (err)

  469.         return err;

  470.     if (!s->fontsize)

  471.         s->fontsize = 16;

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

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

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

  475.         return AVERROR(EINVAL);

  476.     }

  477. 

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

  479. 

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

  481.     load_glyph(ctx, NULL, 0);

  482. 

  483.     /* set the tabsize in pixels */

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

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

  486.         return err;

  487.     }

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

  489. 

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

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

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

  493. 

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

  495. 

  496.     return 0;

  497. }

  498. 

  499. static int query_formats(AVFilterContext *ctx)

  500. {

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

  502.     return 0;

  503. }

  504. 

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

  506. {

  507.     Glyph *glyph = elem;

  508. 

  509.     FT_Done_Glyph(*glyph->glyph);

  510.     av_freep(&glyph->glyph);

  511.     av_free(elem);

  512.     return 0;

  513. }

  514. 

  515. static av_cold void uninit(AVFilterContext *ctx)

  516. {

  517.     DrawTextContext *s = ctx->priv;

  518. 

  519.     av_expr_free(s->x_pexpr);

  520.     av_expr_free(s->y_pexpr);

  521.     av_expr_free(s->draw_pexpr);

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

  523.     av_freep(&s->positions);

  524.     s->nb_positions = 0;

  525. 

  526. 

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

  528.     av_tree_destroy(s->glyphs);

  529.     s->glyphs = NULL;

  530. 

  531.     FT_Done_Face(s->face);

  532.     FT_Done_FreeType(s->library);

  533. 

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

  535. }

  536. 

  537. static inline int is_newline(uint32_t c)

  538. {

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

  540. }

  541. 

  542. static int config_input(AVFilterLink *inlink)

  543. {

  544.     AVFilterContext *ctx = inlink->dst;

  545.     DrawTextContext *s = ctx->priv;

  546.     int ret;

  547. 

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

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

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

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

  552. 

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

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

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

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

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

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

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

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

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

  562. 

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

  564. 

  565.     av_expr_free(s->x_pexpr);

  566.     av_expr_free(s->y_pexpr);

  567.     av_expr_free(s->draw_pexpr);

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

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

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

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

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

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

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

  575. 

  576.         return AVERROR(EINVAL);

  577. 

  578.     return 0;

  579. }

  580. 

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

  582. {

  583.     DrawTextContext *s = ctx->priv;

  584. 

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

  586.         int ret;

  587.         uninit(ctx);

  588.         s->reinit = 1;

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

  590.             return ret;

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

  592.     }

  593. 

  594.     return AVERROR(ENOSYS);

  595. }

  596. 

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

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

  599. {

  600.     DrawTextContext *s = ctx->priv;

  601. 

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

  603.     return 0;

  604. }

  605. 

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

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

  608. {

  609.     DrawTextContext *s = ctx->priv;

  610. 

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

  612.     return 0;

  613. }

  614. 

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

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

  617. {

  618.     DrawTextContext *s = ctx->priv;

  619. 

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

  621.     return 0;

  622. }

  623. 

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

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

  626. {

  627.     DrawTextContext *s = ctx->priv;

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

  629. 

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

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

  632.     return 0;

  633. }

  634. 

  635. #if !HAVE_LOCALTIME_R

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

  637. {

  638.     *tm = *localtime(t);

  639. }

  640. #endif

  641. 

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

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

  644. {

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

  646.     time_t now;

  647.     struct tm tm;

  648. 

  649.     time(&now);

  650.     if (tag == 'L')

  651.         localtime_r(&now, &tm);

  652.     else

  653.         tm = *gmtime(&now);

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

  655.     return 0;

  656. }

  657. 

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

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

  660. {

  661.     DrawTextContext *s = ctx->priv;

  662.     double res;

  663.     int ret;

  664. 

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

  666.                                  NULL, NULL, fun2_names, fun2,

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

  668.     if (ret < 0)

  669.         av_log(ctx, AV_LOG_ERROR,

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

  671.                argv[0]);

  672.     else

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

  674. 

  675.     return ret;

  676. }

  677. 

  678. static const struct drawtext_function {

  679.     const char *name;

  680.     unsigned argc_min, argc_max;

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

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

  683. } functions[] = {

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

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

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

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

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

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

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

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

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

  693. };

  694. 

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

  696.                          unsigned argc, char **argv)

  697. {

  698.     unsigned i;

  699. 

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

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

  702.             continue;

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

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

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

  706.             return AVERROR(EINVAL);

  707.         }

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

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

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

  711.             return AVERROR(EINVAL);

  712.         }

  713.         break;

  714.     }

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

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

  717.         return AVERROR(EINVAL);

  718.     }

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

  720. }

  721. 

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

  723. {

  724.     const char *text = *rtext;

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

  726.     unsigned argc = 0, i;

  727.     int ret;

  728. 

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

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

  731.         return AVERROR(EINVAL);

  732.     }

  733.     text++;

  734.     while (1) {

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

  736.             ret = AVERROR(ENOMEM);

  737.             goto end;

  738.         }

  739.         if (!*text) {

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

  741.             ret = AVERROR(EINVAL);

  742.             goto end;

  743.         }

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

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

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

  747.             break;

  748.         text++;

  749.     }

  750. 

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

  752.         goto end;

  753.     ret = 0;

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

  755. 

  756. end:

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

  758.         av_freep(&argv[i]);

  759.     return ret;

  760. }

  761. 

  762. static int expand_text(AVFilterContext *ctx)

  763. {

  764.     DrawTextContext *s = ctx->priv;

  765.     char *text = s->text;

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

  767.     int ret;

  768. 

  769.     av_bprint_clear(bp);

  770.     while (*text) {

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

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

  773.             text += 2;

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

  775.             text++;

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

  777.                 return ret;

  778.         } else {

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

  780.             text++;

  781.         }

  782.     }

  783.     if (!av_bprint_is_complete(bp))

  784.         return AVERROR(ENOMEM);

  785.     return 0;

  786. }

  787. 

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

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

  790. {

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

  792.     uint32_t code = 0;

  793.     int i, x1, y1;

  794.     uint8_t *p;

  795.     Glyph *glyph = NULL;

  796. 

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

  798.         Glyph dummy = { 0 };

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

  800. 

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

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

  803.             continue;

  804. 

  805.         dummy.code = code;

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

  807. 

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

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

  810.             return AVERROR(EINVAL);

  811. 

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

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

  814. 

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

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

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

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

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

  820.                       0, x1, y1);

  821.     }

  822. 

  823.     return 0;

  824. }

  825. 

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

  827.                      int width, int height)

  828. {

  829.     DrawTextContext *s = ctx->priv;

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

  831. 

  832.     uint32_t code = 0, prev_code = 0;

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

  834.     int max_text_line_w = 0, len;

  835.     int box_w, box_h;

  836.     char *text = s->text;

  837.     uint8_t *p;

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

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

  840.     FT_Vector delta;

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

  842.     Glyph dummy = { 0 };

  843. 

  844.     time_t now = time(0);

  845.     struct tm ltime;

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

  847. 

  848.     av_bprint_clear(bp);

  849. 

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

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

  852. 

  853.     switch (s->exp_mode) {

  854.     case EXP_NONE:

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

  856.         break;

  857.     case EXP_NORMAL:

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

  859.             return ret;

  860.         break;

  861.     case EXP_STRFTIME:

  862.         localtime_r(&now, &ltime);

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

  864.         break;

  865.     }

  866. 

  867.     if (s->tc_opt_string) {

  868.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

  870.         av_bprint_clear(bp);

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

  872.     }

  873. 

  874.     if (!av_bprint_is_complete(bp))

  875.         return AVERROR(ENOMEM);

  876.     text = s->expanded_text.str;

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

  878.         if (!(s->positions =

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

  880.             return AVERROR(ENOMEM);

  881.         s->nb_positions = len;

  882.     }

  883. 

  884.     x = 0;

  885.     y = 0;

  886. 

  887.     /* load and cache glyphs */

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

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

  890. 

  891.         /* get glyph */

  892.         dummy.code = code;

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

  894.         if (!glyph) {

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

  896.         }

  897. 

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

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

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

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

  902.     }

  903.     s->max_glyph_h = y_max - y_min;

  904.     s->max_glyph_w = x_max - x_min;

  905. 

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

  907.     glyph = NULL;

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

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

  910. 

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

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

  913.             continue;

  914. 

  915.         prev_code = code;

  916.         if (is_newline(code)) {

  917. 

  918.             max_text_line_w = FFMAX(max_text_line_w, x);

  919.             y += s->max_glyph_h;

  920.             x = 0;

  921.             continue;

  922.         }

  923. 

  924.         /* get glyph */

  925.         prev_glyph = glyph;

  926.         dummy.code = code;

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

  928. 

  929.         /* kerning */

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

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

  932.                            ft_kerning_default, &delta);

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

  934.         }

  935. 

  936.         /* save position */

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

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

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

  940.         else              x += glyph->advance;

  941.     }

  942. 

  943.     max_text_line_w = FFMAX(x, max_text_line_w);

  944. 

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

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

  947. 

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

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

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

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

  952. 

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

  954. 

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

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

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

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

  959. 

  960.     if(!s->draw)

  961.         return 0;

  962. 

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

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

  965. 

  966.     /* draw box */

  967.     if (s->draw_box)

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

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

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

  971. 

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

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

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

  975.             return ret;

  976.     }

  977. 

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

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

  980.         return ret;

  981. 

  982.     return 0;

  983. }

  984. 

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

  986. {

  987.     AVFilterContext *ctx = inlink->dst;

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

  989.     DrawTextContext *s = ctx->priv;

  990.     int ret;

  991. 

  992.     if (s->reload)

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

  994.             return ret;

  995. 

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

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

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

  999. 

  1000.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1001.     s->metadata = av_frame_get_metadata(frame);

  1002. 

  1003.     draw_text(ctx, frame, frame->width, frame->height);

  1004. 

  1005.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1006.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1007.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1008.            s->x, s->y);

  1009. 

  1010.     return ff_filter_frame(outlink, frame);

  1011. }

  1012. 

  1013. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1014.     {

  1015.         .name             = "default",

  1016.         .type             = AVMEDIA_TYPE_VIDEO,

  1017.         .get_video_buffer = ff_null_get_video_buffer,

  1018.         .filter_frame     = filter_frame,

  1019.         .config_props     = config_input,

  1020.         .needs_writable   = 1,

  1021.     },

  1022.     { NULL }

  1023. };

  1024. 

  1025. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1026.     {

  1027.         .name = "default",

  1028.         .type = AVMEDIA_TYPE_VIDEO,

  1029.     },

  1030.     { NULL }

  1031. };

  1032. 

  1033. AVFilter avfilter_vf_drawtext = {

  1034.     .name          = "drawtext",

  1035.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1036.     .priv_size     = sizeof(DrawTextContext),

  1037.     .priv_class    = &drawtext_class,

  1038.     .init          = init,

  1039.     .uninit        = uninit,

  1040.     .query_formats = query_formats,

  1041. 

  1042.     .inputs    = avfilter_vf_drawtext_inputs,

  1043.     .outputs   = avfilter_vf_drawtext_outputs,

  1044.     .process_command = command,

  1045. };