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FFmpeg/libavfilter/vf_drawtext.c

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  1. /*

  2.  * Copyright (c) 2011 Stefano Sabatini

  3.  * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram

  4.  * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * drawtext filter, based on the original vhook/drawtext.c

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include <sys/time.h>

  30. #include <time.h>

  31. 

  32. #include "config.h"

  33. #include "libavutil/avstring.h"

  34. #include "libavutil/bprint.h"

  35. #include "libavutil/common.h"

  36. #include "libavutil/file.h"

  37. #include "libavutil/eval.h"

  38. #include "libavutil/opt.h"

  39. #include "libavutil/random_seed.h"

  40. #include "libavutil/parseutils.h"

  41. #include "libavutil/timecode.h"

  42. #include "libavutil/tree.h"

  43. #include "libavutil/lfg.h"

  44. #include "avfilter.h"

  45. #include "drawutils.h"

  46. #include "formats.h"

  47. #include "internal.h"

  48. #include "video.h"

  49. 

  50. #include <ft2build.h>

  51. #include <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. } DrawTextContext;

  168. 

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

  170. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  171. 

  172. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  188. 

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

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

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

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

  193. 

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

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

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

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

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

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

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

  201. 

  202.     /* FT_LOAD_* flags */

  203.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  219.     { NULL},

  220. };

  221. 

  222. AVFILTER_DEFINE_CLASS(drawtext);

  223. 

  224. #undef __FTERRORS_H__

  225. #define FT_ERROR_START_LIST {

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

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

  228. 

  229. struct ft_error

  230. {

  231.     int err;

  232.     const char *err_msg;

  233. } static ft_errors[] =

  234. #include FT_ERRORS_H

  235. 

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

  237. 

  238. typedef struct {

  239.     FT_Glyph *glyph;

  240.     uint32_t code;

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

  242.     FT_BBox bbox;

  243.     int advance;

  244.     int bitmap_left;

  245.     int bitmap_top;

  246. } Glyph;

  247. 

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

  249. {

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

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

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

  253. }

  254. 

  255. /**

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

  257.  */

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

  259. {

  260.     DrawTextContext *s = ctx->priv;

  261.     Glyph *glyph;

  262.     struct AVTreeNode *node = NULL;

  263.     int ret;

  264. 

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

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

  267.         return AVERROR(EINVAL);

  268. 

  269.     /* save glyph */

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

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

  272.         ret = AVERROR(ENOMEM);

  273.         goto error;

  274.     }

  275.     glyph->code  = code;

  276. 

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

  278.         ret = AVERROR(EINVAL);

  279.         goto error;

  280.     }

  281. 

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

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

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

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

  286. 

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

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

  289. 

  290.     /* cache the newly created glyph */

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

  292.         ret = AVERROR(ENOMEM);

  293.         goto error;

  294.     }

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

  296. 

  297.     if (glyph_ptr)

  298.         *glyph_ptr = glyph;

  299.     return 0;

  300. 

  301. error:

  302.     if (glyph)

  303.         av_freep(&glyph->glyph);

  304.     av_freep(&glyph);

  305.     av_freep(&node);

  306.     return ret;

  307. }

  308. 

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

  310.                           const char **error)

  311. {

  312.     DrawTextContext *s = ctx->priv;

  313.     int err;

  314. 

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

  316.     if (err) {

  317.         *error = FT_ERRMSG(err);

  318.         return AVERROR(EINVAL);

  319.     }

  320.     return 0;

  321. }

  322. 

  323. #if CONFIG_FONTCONFIG

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

  325. {

  326.     DrawTextContext *s = ctx->priv;

  327.     FcConfig *fontconfig;

  328.     FcPattern *pattern, *fpat;

  329.     FcResult result = FcResultMatch;

  330.     FcChar8 *filename;

  331.     int err, index;

  332.     double size;

  333. 

  334.     fontconfig = FcInitLoadConfigAndFonts();

  335.     if (!fontconfig) {

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

  337.         return AVERROR(EINVAL);

  338.     }

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

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

  341.     if (!pattern) {

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

  343.         return AVERROR(EINVAL);

  344.     }

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

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

  347.         return AVERROR(EINVAL);

  348.     }

  349.     FcDefaultSubstitute(pattern);

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

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

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

  353.         return AVERROR(EINVAL);

  354.     }

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

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

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

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

  359.         return AVERROR(EINVAL);

  360.     }

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

  362.     if (!s->fontsize)

  363.         s->fontsize = size + 0.5;

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

  365.     if (err)

  366.         return err;

  367.     FcPatternDestroy(fpat);

  368.     FcPatternDestroy(pattern);

  369.     FcConfigDestroy(fontconfig);

  370.     return 0;

  371. }

  372. #endif

  373. 

  374. static int load_font(AVFilterContext *ctx)

  375. {

  376.     DrawTextContext *s = ctx->priv;

  377.     int err;

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

  379. 

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

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

  382.     if (!err)

  383.         return 0;

  384. #if CONFIG_FONTCONFIG

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

  386.     if (!err)

  387.         return 0;

  388. #endif

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

  390.            s->fontfile, error);

  391.     return err;

  392. }

  393. 

  394. static int load_textfile(AVFilterContext *ctx)

  395. {

  396.     DrawTextContext *s = ctx->priv;

  397.     int err;

  398.     uint8_t *textbuf;

  399.     size_t textbuf_size;

  400. 

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

  402.         av_log(ctx, AV_LOG_ERROR,

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

  404.                s->textfile);

  405.         return err;

  406.     }

  407. 

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

  409.         return AVERROR(ENOMEM);

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

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

  412.     av_file_unmap(textbuf, textbuf_size);

  413. 

  414.     return 0;

  415. }

  416. 

  417. static av_cold int init(AVFilterContext *ctx)

  418. {

  419.     int err;

  420.     DrawTextContext *s = ctx->priv;

  421.     Glyph *glyph;

  422. 

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

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

  425.         return AVERROR(EINVAL);

  426.     }

  427. 

  428.     if (s->textfile) {

  429.         if (s->text) {

  430.             av_log(ctx, AV_LOG_ERROR,

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

  432.             return AVERROR(EINVAL);

  433.         }

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

  435.             return err;

  436.     }

  437. 

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

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

  440. 

  441.     if (s->tc_opt_string) {

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

  443.                                                s->tc_opt_string, ctx);

  444.         if (ret < 0)

  445.             return ret;

  446.         if (s->tc24hmax)

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

  448.         if (!s->text)

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

  450.     }

  451. 

  452.     if (!s->text) {

  453.         av_log(ctx, AV_LOG_ERROR,

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

  455.         return AVERROR(EINVAL);

  456.     }

  457. 

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

  459.         av_log(ctx, AV_LOG_ERROR,

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

  461.         return AVERROR(EINVAL);

  462.     }

  463. 

  464.     err = load_font(ctx);

  465.     if (err)

  466.         return err;

  467.     if (!s->fontsize)

  468.         s->fontsize = 16;

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

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

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

  472.         return AVERROR(EINVAL);

  473.     }

  474. 

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

  476. 

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

  478.     load_glyph(ctx, NULL, 0);

  479. 

  480.     /* set the tabsize in pixels */

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

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

  483.         return err;

  484.     }

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

  486. 

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

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

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

  490. 

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

  492. 

  493.     return 0;

  494. }

  495. 

  496. static int query_formats(AVFilterContext *ctx)

  497. {

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

  499.     return 0;

  500. }

  501. 

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

  503. {

  504.     Glyph *glyph = elem;

  505. 

  506.     FT_Done_Glyph(*glyph->glyph);

  507.     av_freep(&glyph->glyph);

  508.     av_free(elem);

  509.     return 0;

  510. }

  511. 

  512. static av_cold void uninit(AVFilterContext *ctx)

  513. {

  514.     DrawTextContext *s = ctx->priv;

  515. 

  516.     av_expr_free(s->x_pexpr);

  517.     av_expr_free(s->y_pexpr);

  518.     av_expr_free(s->draw_pexpr);

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

  520.     av_freep(&s->positions);

  521.     s->nb_positions = 0;

  522. 

  523. 

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

  525.     av_tree_destroy(s->glyphs);

  526.     s->glyphs = NULL;

  527. 

  528.     FT_Done_Face(s->face);

  529.     FT_Done_FreeType(s->library);

  530. 

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

  532. }

  533. 

  534. static inline int is_newline(uint32_t c)

  535. {

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

  537. }

  538. 

  539. static int config_input(AVFilterLink *inlink)

  540. {

  541.     AVFilterContext *ctx = inlink->dst;

  542.     DrawTextContext *s = ctx->priv;

  543.     int ret;

  544. 

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

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

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

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

  549. 

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

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

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

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

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

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

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

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

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

  559. 

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

  561. 

  562.     av_expr_free(s->x_pexpr);

  563.     av_expr_free(s->y_pexpr);

  564.     av_expr_free(s->draw_pexpr);

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

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

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

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

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

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

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

  572. 

  573.         return AVERROR(EINVAL);

  574. 

  575.     return 0;

  576. }

  577. 

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

  579. {

  580.     DrawTextContext *s = ctx->priv;

  581. 

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

  583.         int ret;

  584.         uninit(ctx);

  585.         s->reinit = 1;

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

  587.             return ret;

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

  589.     }

  590. 

  591.     return AVERROR(ENOSYS);

  592. }

  593. 

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

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

  596. {

  597.     DrawTextContext *s = ctx->priv;

  598. 

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

  600.     return 0;

  601. }

  602. 

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

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

  605. {

  606.     DrawTextContext *s = ctx->priv;

  607. 

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

  609.     return 0;

  610. }

  611. 

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

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

  614. {

  615.     DrawTextContext *s = ctx->priv;

  616. 

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

  618.     return 0;

  619. }

  620. 

  621. #if !HAVE_LOCALTIME_R

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

  623. {

  624.     *tm = *localtime(t);

  625. }

  626. #endif

  627. 

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

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

  630. {

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

  632.     time_t now;

  633.     struct tm tm;

  634. 

  635.     time(&now);

  636.     if (tag == 'L')

  637.         localtime_r(&now, &tm);

  638.     else

  639.         tm = *gmtime(&now);

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

  641.     return 0;

  642. }

  643. 

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

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

  646. {

  647.     DrawTextContext *s = ctx->priv;

  648.     double res;

  649.     int ret;

  650. 

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

  652.                                  NULL, NULL, fun2_names, fun2,

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

  654.     if (ret < 0)

  655.         av_log(ctx, AV_LOG_ERROR,

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

  657.                argv[0]);

  658.     else

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

  660. 

  661.     return ret;

  662. }

  663. 

  664. static const struct drawtext_function {

  665.     const char *name;

  666.     unsigned argc_min, argc_max;

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

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

  669. } functions[] = {

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

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

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

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

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

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

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

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

  678. };

  679. 

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

  681.                          unsigned argc, char **argv)

  682. {

  683.     unsigned i;

  684. 

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

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

  687.             continue;

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

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

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

  691.             return AVERROR(EINVAL);

  692.         }

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

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

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

  696.             return AVERROR(EINVAL);

  697.         }

  698.         break;

  699.     }

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

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

  702.         return AVERROR(EINVAL);

  703.     }

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

  705. }

  706. 

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

  708. {

  709.     const char *text = *rtext;

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

  711.     unsigned argc = 0, i;

  712.     int ret;

  713. 

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

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

  716.         return AVERROR(EINVAL);

  717.     }

  718.     text++;

  719.     while (1) {

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

  721.             ret = AVERROR(ENOMEM);

  722.             goto end;

  723.         }

  724.         if (!*text) {

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

  726.             ret = AVERROR(EINVAL);

  727.             goto end;

  728.         }

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

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

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

  732.             break;

  733.         text++;

  734.     }

  735. 

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

  737.         goto end;

  738.     ret = 0;

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

  740. 

  741. end:

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

  743.         av_freep(&argv[i]);

  744.     return ret;

  745. }

  746. 

  747. static int expand_text(AVFilterContext *ctx)

  748. {

  749.     DrawTextContext *s = ctx->priv;

  750.     char *text = s->text;

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

  752.     int ret;

  753. 

  754.     av_bprint_clear(bp);

  755.     while (*text) {

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

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

  758.             text += 2;

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

  760.             text++;

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

  762.                 return ret;

  763.         } else {

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

  765.             text++;

  766.         }

  767.     }

  768.     if (!av_bprint_is_complete(bp))

  769.         return AVERROR(ENOMEM);

  770.     return 0;

  771. }

  772. 

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

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

  775. {

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

  777.     uint32_t code = 0;

  778.     int i, x1, y1;

  779.     uint8_t *p;

  780.     Glyph *glyph = NULL;

  781. 

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

  783.         Glyph dummy = { 0 };

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

  785. 

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

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

  788.             continue;

  789. 

  790.         dummy.code = code;

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

  792. 

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

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

  795.             return AVERROR(EINVAL);

  796. 

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

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

  799. 

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

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

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

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

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

  805.                       0, x1, y1);

  806.     }

  807. 

  808.     return 0;

  809. }

  810. 

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

  812.                      int width, int height)

  813. {

  814.     DrawTextContext *s = ctx->priv;

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

  816. 

  817.     uint32_t code = 0, prev_code = 0;

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

  819.     int max_text_line_w = 0, len;

  820.     int box_w, box_h;

  821.     char *text = s->text;

  822.     uint8_t *p;

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

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

  825.     FT_Vector delta;

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

  827.     Glyph dummy = { 0 };

  828. 

  829.     time_t now = time(0);

  830.     struct tm ltime;

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

  832. 

  833.     av_bprint_clear(bp);

  834. 

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

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

  837. 

  838.     switch (s->exp_mode) {

  839.     case EXP_NONE:

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

  841.         break;

  842.     case EXP_NORMAL:

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

  844.             return ret;

  845.         break;

  846.     case EXP_STRFTIME:

  847.         localtime_r(&now, &ltime);

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

  849.         break;

  850.     }

  851. 

  852.     if (s->tc_opt_string) {

  853.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

  855.         av_bprint_clear(bp);

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

  857.     }

  858. 

  859.     if (!av_bprint_is_complete(bp))

  860.         return AVERROR(ENOMEM);

  861.     text = s->expanded_text.str;

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

  863.         if (!(s->positions =

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

  865.             return AVERROR(ENOMEM);

  866.         s->nb_positions = len;

  867.     }

  868. 

  869.     x = 0;

  870.     y = 0;

  871. 

  872.     /* load and cache glyphs */

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

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

  875. 

  876.         /* get glyph */

  877.         dummy.code = code;

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

  879.         if (!glyph) {

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

  881.         }

  882. 

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

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

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

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

  887.     }

  888.     s->max_glyph_h = y_max - y_min;

  889.     s->max_glyph_w = x_max - x_min;

  890. 

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

  892.     glyph = NULL;

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

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

  895. 

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

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

  898.             continue;

  899. 

  900.         prev_code = code;

  901.         if (is_newline(code)) {

  902. 

  903.             max_text_line_w = FFMAX(max_text_line_w, x);

  904.             y += s->max_glyph_h;

  905.             x = 0;

  906.             continue;

  907.         }

  908. 

  909.         /* get glyph */

  910.         prev_glyph = glyph;

  911.         dummy.code = code;

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

  913. 

  914.         /* kerning */

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

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

  917.                            ft_kerning_default, &delta);

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

  919.         }

  920. 

  921.         /* save position */

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

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

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

  925.         else              x += glyph->advance;

  926.     }

  927. 

  928.     max_text_line_w = FFMAX(x, max_text_line_w);

  929. 

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

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

  932. 

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

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

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

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

  937. 

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

  939. 

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

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

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

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

  944. 

  945.     if(!s->draw)

  946.         return 0;

  947. 

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

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

  950. 

  951.     /* draw box */

  952.     if (s->draw_box)

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

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

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

  956. 

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

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

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

  960.             return ret;

  961.     }

  962. 

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

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

  965.         return ret;

  966. 

  967.     return 0;

  968. }

  969. 

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

  971. {

  972.     AVFilterContext *ctx = inlink->dst;

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

  974.     DrawTextContext *s = ctx->priv;

  975.     int ret;

  976. 

  977.     if (s->reload)

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

  979.             return ret;

  980. 

  981.     s->var_values[VAR_N] = inlink->frame_count;

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

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

  984. 

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

  986. 

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

  988. 

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

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

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

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

  993. 

  994.     return ff_filter_frame(outlink, frame);

  995. }

  996. 

  997. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  998.     {

  999.         .name             = "default",

  1000.         .type             = AVMEDIA_TYPE_VIDEO,

  1001.         .get_video_buffer = ff_null_get_video_buffer,

  1002.         .filter_frame     = filter_frame,

  1003.         .config_props     = config_input,

  1004.         .needs_writable   = 1,

  1005.     },

  1006.     { NULL }

  1007. };

  1008. 

  1009. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1010.     {

  1011.         .name = "default",

  1012.         .type = AVMEDIA_TYPE_VIDEO,

  1013.     },

  1014.     { NULL }

  1015. };

  1016. 

  1017. AVFilter avfilter_vf_drawtext = {

  1018.     .name          = "drawtext",

  1019.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1020.     .priv_size     = sizeof(DrawTextContext),

  1021.     .priv_class    = &drawtext_class,

  1022.     .init          = init,

  1023.     .uninit        = uninit,

  1024.     .query_formats = query_formats,

  1025. 

  1026.     .inputs    = avfilter_vf_drawtext_inputs,

  1027.     .outputs   = avfilter_vf_drawtext_outputs,

  1028.     .process_command = command,

  1029. };