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

  168. } DrawTextContext;

  169. 

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

  171. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  172. 

  173. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  189. 

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

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

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

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

  194. 

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

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

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

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

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

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

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

  202.     {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, 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",                     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT },                     .flags = FLAGS, .unit = "ft_load_flags" },

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

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

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

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

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

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

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

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

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

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

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

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

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

  220.         { "no_autohint",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT },                 .flags = FLAGS, .unit = "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 *s = ctx->priv;

  263.     Glyph *glyph;

  264.     struct AVTreeNode *node = NULL;

  265.     int ret;

  266. 

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

  268.     if (FT_Load_Char(s->face, code, s->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(s->face->glyph, glyph->glyph)) {

  280.         ret = AVERROR(EINVAL);

  281.         goto error;

  282.     }

  283. 

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

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

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

  287.     glyph->advance     = s->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(&s->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 *s = ctx->priv;

  315.     int err;

  316. 

  317.     err = FT_New_Face(s->library, path, index, &s->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 *s = 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(s->fontfile ? s->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 (!s->fontsize)

  365.         s->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 *s = 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, s->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.            s->fontfile, error);

  393.     return err;

  394. }

  395. 

  396. static int load_textfile(AVFilterContext *ctx)

  397. {

  398.     DrawTextContext *s = ctx->priv;

  399.     int err;

  400.     uint8_t *textbuf;

  401.     size_t textbuf_size;

  402. 

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

  404.         av_log(ctx, AV_LOG_ERROR,

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

  406.                s->textfile);

  407.         return err;

  408.     }

  409. 

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

  411.         return AVERROR(ENOMEM);

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

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

  414.     av_file_unmap(textbuf, textbuf_size);

  415. 

  416.     return 0;

  417. }

  418. 

  419. static av_cold int init(AVFilterContext *ctx)

  420. {

  421.     int err;

  422.     DrawTextContext *s = ctx->priv;

  423.     Glyph *glyph;

  424. 

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

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

  427.         return AVERROR(EINVAL);

  428.     }

  429. 

  430.     if (s->textfile) {

  431.         if (s->text) {

  432.             av_log(ctx, AV_LOG_ERROR,

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

  434.             return AVERROR(EINVAL);

  435.         }

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

  437.             return err;

  438.     }

  439. 

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

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

  442. 

  443.     if (s->tc_opt_string) {

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

  445.                                                s->tc_opt_string, ctx);

  446.         if (ret < 0)

  447.             return ret;

  448.         if (s->tc24hmax)

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

  450.         if (!s->text)

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

  452.     }

  453. 

  454.     if (!s->text) {

  455.         av_log(ctx, AV_LOG_ERROR,

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

  457.         return AVERROR(EINVAL);

  458.     }

  459. 

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

  461.         av_log(ctx, AV_LOG_ERROR,

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

  463.         return AVERROR(EINVAL);

  464.     }

  465. 

  466.     err = load_font(ctx);

  467.     if (err)

  468.         return err;

  469.     if (!s->fontsize)

  470.         s->fontsize = 16;

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

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

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

  474.         return AVERROR(EINVAL);

  475.     }

  476. 

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

  478. 

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

  480.     load_glyph(ctx, NULL, 0);

  481. 

  482.     /* set the tabsize in pixels */

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

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

  485.         return err;

  486.     }

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

  488. 

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

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

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

  492. 

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

  494. 

  495.     return 0;

  496. }

  497. 

  498. static int query_formats(AVFilterContext *ctx)

  499. {

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

  501.     return 0;

  502. }

  503. 

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

  505. {

  506.     Glyph *glyph = elem;

  507. 

  508.     FT_Done_Glyph(*glyph->glyph);

  509.     av_freep(&glyph->glyph);

  510.     av_free(elem);

  511.     return 0;

  512. }

  513. 

  514. static av_cold void uninit(AVFilterContext *ctx)

  515. {

  516.     DrawTextContext *s = ctx->priv;

  517. 

  518.     av_expr_free(s->x_pexpr);

  519.     av_expr_free(s->y_pexpr);

  520.     av_expr_free(s->draw_pexpr);

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

  522.     av_freep(&s->positions);

  523.     s->nb_positions = 0;

  524. 

  525. 

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

  527.     av_tree_destroy(s->glyphs);

  528.     s->glyphs = NULL;

  529. 

  530.     FT_Done_Face(s->face);

  531.     FT_Done_FreeType(s->library);

  532. 

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

  534. }

  535. 

  536. static inline int is_newline(uint32_t c)

  537. {

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

  539. }

  540. 

  541. static int config_input(AVFilterLink *inlink)

  542. {

  543.     AVFilterContext *ctx = inlink->dst;

  544.     DrawTextContext *s = ctx->priv;

  545.     int ret;

  546. 

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

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

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

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

  551. 

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

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

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

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

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

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

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

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

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

  561. 

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

  563. 

  564.     av_expr_free(s->x_pexpr);

  565.     av_expr_free(s->y_pexpr);

  566.     av_expr_free(s->draw_pexpr);

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

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

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

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

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

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

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

  574. 

  575.         return AVERROR(EINVAL);

  576. 

  577.     return 0;

  578. }

  579. 

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

  581. {

  582.     DrawTextContext *s = ctx->priv;

  583. 

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

  585.         int ret;

  586.         uninit(ctx);

  587.         s->reinit = 1;

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

  589.             return ret;

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

  591.     }

  592. 

  593.     return AVERROR(ENOSYS);

  594. }

  595. 

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

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

  598. {

  599.     DrawTextContext *s = ctx->priv;

  600. 

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

  602.     return 0;

  603. }

  604. 

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

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

  607. {

  608.     DrawTextContext *s = ctx->priv;

  609. 

  610.     av_bprintf(bp, "%.6f", s->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 *s = ctx->priv;

  618. 

  619.     av_bprintf(bp, "%d", (int)s->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 int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,

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

  648. {

  649.     DrawTextContext *s = ctx->priv;

  650.     double res;

  651.     int ret;

  652. 

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

  654.                                  NULL, NULL, fun2_names, fun2,

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

  656.     if (ret < 0)

  657.         av_log(ctx, AV_LOG_ERROR,

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

  659.                argv[0]);

  660.     else

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

  662. 

  663.     return ret;

  664. }

  665. 

  666. static const struct drawtext_function {

  667.     const char *name;

  668.     unsigned argc_min, argc_max;

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

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

  671. } functions[] = {

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

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

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

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

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

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

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

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

  680. };

  681. 

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

  683.                          unsigned argc, char **argv)

  684. {

  685.     unsigned i;

  686. 

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

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

  689.             continue;

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

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

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

  693.             return AVERROR(EINVAL);

  694.         }

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

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

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

  698.             return AVERROR(EINVAL);

  699.         }

  700.         break;

  701.     }

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

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

  704.         return AVERROR(EINVAL);

  705.     }

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

  707. }

  708. 

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

  710. {

  711.     const char *text = *rtext;

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

  713.     unsigned argc = 0, i;

  714.     int ret;

  715. 

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

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

  718.         return AVERROR(EINVAL);

  719.     }

  720.     text++;

  721.     while (1) {

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

  723.             ret = AVERROR(ENOMEM);

  724.             goto end;

  725.         }

  726.         if (!*text) {

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

  728.             ret = AVERROR(EINVAL);

  729.             goto end;

  730.         }

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

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

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

  734.             break;

  735.         text++;

  736.     }

  737. 

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

  739.         goto end;

  740.     ret = 0;

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

  742. 

  743. end:

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

  745.         av_freep(&argv[i]);

  746.     return ret;

  747. }

  748. 

  749. static int expand_text(AVFilterContext *ctx)

  750. {

  751.     DrawTextContext *s = ctx->priv;

  752.     char *text = s->text;

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

  754.     int ret;

  755. 

  756.     av_bprint_clear(bp);

  757.     while (*text) {

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

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

  760.             text += 2;

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

  762.             text++;

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

  764.                 return ret;

  765.         } else {

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

  767.             text++;

  768.         }

  769.     }

  770.     if (!av_bprint_is_complete(bp))

  771.         return AVERROR(ENOMEM);

  772.     return 0;

  773. }

  774. 

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

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

  777. {

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

  779.     uint32_t code = 0;

  780.     int i, x1, y1;

  781.     uint8_t *p;

  782.     Glyph *glyph = NULL;

  783. 

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

  785.         Glyph dummy = { 0 };

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

  787. 

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

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

  790.             continue;

  791. 

  792.         dummy.code = code;

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

  794. 

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

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

  797.             return AVERROR(EINVAL);

  798. 

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

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

  801. 

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

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

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

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

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

  807.                       0, x1, y1);

  808.     }

  809. 

  810.     return 0;

  811. }

  812. 

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

  814.                      int width, int height)

  815. {

  816.     DrawTextContext *s = ctx->priv;

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

  818. 

  819.     uint32_t code = 0, prev_code = 0;

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

  821.     int max_text_line_w = 0, len;

  822.     int box_w, box_h;

  823.     char *text = s->text;

  824.     uint8_t *p;

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

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

  827.     FT_Vector delta;

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

  829.     Glyph dummy = { 0 };

  830. 

  831.     time_t now = time(0);

  832.     struct tm ltime;

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

  834. 

  835.     av_bprint_clear(bp);

  836. 

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

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

  839. 

  840.     switch (s->exp_mode) {

  841.     case EXP_NONE:

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

  843.         break;

  844.     case EXP_NORMAL:

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

  846.             return ret;

  847.         break;

  848.     case EXP_STRFTIME:

  849.         localtime_r(&now, &ltime);

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

  851.         break;

  852.     }

  853. 

  854.     if (s->tc_opt_string) {

  855.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

  857.         av_bprint_clear(bp);

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

  859.     }

  860. 

  861.     if (!av_bprint_is_complete(bp))

  862.         return AVERROR(ENOMEM);

  863.     text = s->expanded_text.str;

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

  865.         if (!(s->positions =

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

  867.             return AVERROR(ENOMEM);

  868.         s->nb_positions = len;

  869.     }

  870. 

  871.     x = 0;

  872.     y = 0;

  873. 

  874.     /* load and cache glyphs */

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

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

  877. 

  878.         /* get glyph */

  879.         dummy.code = code;

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

  881.         if (!glyph) {

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

  883.         }

  884. 

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

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

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

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

  889.     }

  890.     s->max_glyph_h = y_max - y_min;

  891.     s->max_glyph_w = x_max - x_min;

  892. 

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

  894.     glyph = NULL;

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

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

  897. 

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

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

  900.             continue;

  901. 

  902.         prev_code = code;

  903.         if (is_newline(code)) {

  904. 

  905.             max_text_line_w = FFMAX(max_text_line_w, x);

  906.             y += s->max_glyph_h;

  907.             x = 0;

  908.             continue;

  909.         }

  910. 

  911.         /* get glyph */

  912.         prev_glyph = glyph;

  913.         dummy.code = code;

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

  915. 

  916.         /* kerning */

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

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

  919.                            ft_kerning_default, &delta);

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

  921.         }

  922. 

  923.         /* save position */

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

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

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

  927.         else              x += glyph->advance;

  928.     }

  929. 

  930.     max_text_line_w = FFMAX(x, max_text_line_w);

  931. 

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

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

  934. 

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

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

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

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

  939. 

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

  941. 

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

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

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

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

  946. 

  947.     if(!s->draw)

  948.         return 0;

  949. 

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

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

  952. 

  953.     /* draw box */

  954.     if (s->draw_box)

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

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

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

  958. 

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

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

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

  962.             return ret;

  963.     }

  964. 

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

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

  967.         return ret;

  968. 

  969.     return 0;

  970. }

  971. 

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

  973. {

  974.     AVFilterContext *ctx = inlink->dst;

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

  976.     DrawTextContext *s = ctx->priv;

  977.     int ret;

  978. 

  979.     if (s->reload)

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

  981.             return ret;

  982. 

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

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

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

  986. 

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

  988. 

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

  990. 

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

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

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

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

  995. 

  996.     return ff_filter_frame(outlink, frame);

  997. }

  998. 

  999. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1000.     {

  1001.         .name             = "default",

  1002.         .type             = AVMEDIA_TYPE_VIDEO,

  1003.         .get_video_buffer = ff_null_get_video_buffer,

  1004.         .filter_frame     = filter_frame,

  1005.         .config_props     = config_input,

  1006.         .needs_writable   = 1,

  1007.     },

  1008.     { NULL }

  1009. };

  1010. 

  1011. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1012.     {

  1013.         .name = "default",

  1014.         .type = AVMEDIA_TYPE_VIDEO,

  1015.     },

  1016.     { NULL }

  1017. };

  1018. 

  1019. AVFilter avfilter_vf_drawtext = {

  1020.     .name          = "drawtext",

  1021.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1022.     .priv_size     = sizeof(DrawTextContext),

  1023.     .priv_class    = &drawtext_class,

  1024.     .init          = init,

  1025.     .uninit        = uninit,

  1026.     .query_formats = query_formats,

  1027. 

  1028.     .inputs    = avfilter_vf_drawtext_inputs,

  1029.     .outputs   = avfilter_vf_drawtext_outputs,

  1030.     .process_command = command,

  1031. };