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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. #if FF_API_DRAWTEXT_OLD_TIMELINE
  159.     char   *draw_expr;              ///< expression for draw
  160.     AVExpr *draw_pexpr;             ///< parsed expression for draw
  161.     int draw;                       ///< set to zero to prevent drawing
  162. #endif
  163.     AVLFG  prng;                    ///< random
  164.     char       *tc_opt_string;      ///< specified timecode option string
  165.     AVRational  tc_rate;            ///< frame rate for timecode
  166.     AVTimecode  tc;                 ///< timecode context
  167.     int tc24hmax;                   ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
  168.     int reload;                     ///< reload text file for each frame
  169.     int start_number;               ///< starting frame number for n/frame_num var
  170.     AVDictionary *metadata;
  171. } DrawTextContext;
  172.  
  173. #define OFFSET(x) offsetof(DrawTextContext, x)
  174. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
  175.  
  176. static const AVOption drawtext_options[]= {
  177.     {"fontfile",    "set font file",        OFFSET(fontfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},
  178.     {"text",        "set text",             OFFSET(text),               AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},
  179.     {"textfile",    "set text file",        OFFSET(textfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},
  180.     {"fontcolor",   "set foreground color", OFFSET(fontcolor.rgba),     AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
  181.     {"boxcolor",    "set box color",        OFFSET(boxcolor.rgba),      AV_OPT_TYPE_COLOR,  {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
  182.     {"shadowcolor", "set shadow color",     OFFSET(shadowcolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
  183.     {"box",         "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.i64=0},     0,        1       , FLAGS},
  184.     {"fontsize",    "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.i64=0},     0,        INT_MAX , FLAGS},
  185.     {"x",           "set x expression",     OFFSET(x_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX, FLAGS},
  186.     {"y",           "set y expression",     OFFSET(y_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX, FLAGS},
  187.     {"shadowx",     "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},
  188.     {"shadowy",     "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},
  189.     {"tabsize",     "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.i64=4},     0,        INT_MAX , FLAGS},
  190.     {"basetime",    "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
  191. #if FF_API_DRAWTEXT_OLD_TIMELINE
  192.     {"draw",        "if false do not draw (deprecated)", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str=NULL},   CHAR_MIN, CHAR_MAX, FLAGS},
  193. #endif
  194.  
  195.     {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},
  196.         {"none",     "set no expansion",                    OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE},     0, 0, FLAGS, "expansion"},
  197.         {"normal",   "set normal expansion",                OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL},   0, 0, FLAGS, "expansion"},
  198.         {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
  199.  
  200.     {"timecode",        "set initial timecode",             OFFSET(tc_opt_string), AV_OPT_TYPE_STRING,   {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
  201.     {"tc24hmax",        "set 24 hours max (timecode only)", OFFSET(tc24hmax),      AV_OPT_TYPE_INT,      {.i64=0},           0,        1, FLAGS},
  202.     {"timecode_rate",   "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},
  203.     {"r",               "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},
  204.     {"rate",            "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},
  205.     {"reload",     "reload text file for each frame",                       OFFSET(reload),     AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
  206.     {"fix_bounds", "if true, check and fix text coords to avoid clipping",  OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
  207.     {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
  208.  
  209.     /* FT_LOAD_* flags */
  210.     { "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" },
  211.         { "default",                     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT },                     .flags = FLAGS, .unit = "ft_load_flags" },
  212.         { "no_scale",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE },                    .flags = FLAGS, .unit = "ft_load_flags" },
  213.         { "no_hinting",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING },                  .flags = FLAGS, .unit = "ft_load_flags" },
  214.         { "render",                      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER },                      .flags = FLAGS, .unit = "ft_load_flags" },
  215.         { "no_bitmap",                   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP },                   .flags = FLAGS, .unit = "ft_load_flags" },
  216.         { "vertical_layout",             NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT },             .flags = FLAGS, .unit = "ft_load_flags" },
  217.         { "force_autohint",              NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT },              .flags = FLAGS, .unit = "ft_load_flags" },
  218.         { "crop_bitmap",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP },                 .flags = FLAGS, .unit = "ft_load_flags" },
  219.         { "pedantic",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC },                    .flags = FLAGS, .unit = "ft_load_flags" },
  220.         { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
  221.         { "no_recurse",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE },                  .flags = FLAGS, .unit = "ft_load_flags" },
  222.         { "ignore_transform",            NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM },            .flags = FLAGS, .unit = "ft_load_flags" },
  223.         { "monochrome",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME },                  .flags = FLAGS, .unit = "ft_load_flags" },
  224.         { "linear_design",               NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN },               .flags = FLAGS, .unit = "ft_load_flags" },
  225.         { "no_autohint",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT },                 .flags = FLAGS, .unit = "ft_load_flags" },
  226.     { NULL }
  227. };
  228.  
  229. AVFILTER_DEFINE_CLASS(drawtext);
  230.  
  231. #undef __FTERRORS_H__
  232. #define FT_ERROR_START_LIST {
  233. #define FT_ERRORDEF(e, v, s) { (e), (s) },
  234. #define FT_ERROR_END_LIST { 0, NULL } };
  235.  
  236. struct ft_error
  237. {
  238.     int err;
  239.     const char *err_msg;
  240. } static ft_errors[] =
  241. #include FT_ERRORS_H
  242.  
  243. #define FT_ERRMSG(e) ft_errors[e].err_msg
  244.  
  245. typedef struct {
  246.     FT_Glyph *glyph;
  247.     uint32_t code;
  248.     FT_Bitmap bitmap; ///< array holding bitmaps of font
  249.     FT_BBox bbox;
  250.     int advance;
  251.     int bitmap_left;
  252.     int bitmap_top;
  253. } Glyph;
  254.  
  255. static int glyph_cmp(void *key, const void *b)
  256. {
  257.     const Glyph *a = key, *bb = b;
  258.     int64_t diff = (int64_t)a->code - (int64_t)bb->code;
  259.     return diff > 0 ? 1 : diff < 0 ? -1 : 0;
  260. }
  261.  
  262. /**
  263.  * Load glyphs corresponding to the UTF-32 codepoint code.
  264.  */
  265. static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
  266. {
  267.     DrawTextContext *s = ctx->priv;
  268.     Glyph *glyph;
  269.     struct AVTreeNode *node = NULL;
  270.     int ret;
  271.  
  272.     /* load glyph into s->face->glyph */
  273.     if (FT_Load_Char(s->face, code, s->ft_load_flags))
  274.         return AVERROR(EINVAL);
  275.  
  276.     /* save glyph */
  277.     if (!(glyph = av_mallocz(sizeof(*glyph))) ||
  278.         !(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
  279.         ret = AVERROR(ENOMEM);
  280.         goto error;
  281.     }
  282.     glyph->code  = code;
  283.  
  284.     if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {
  285.         ret = AVERROR(EINVAL);
  286.         goto error;
  287.     }
  288.  
  289.     glyph->bitmap      = s->face->glyph->bitmap;
  290.     glyph->bitmap_left = s->face->glyph->bitmap_left;
  291.     glyph->bitmap_top  = s->face->glyph->bitmap_top;
  292.     glyph->advance     = s->face->glyph->advance.x >> 6;
  293.  
  294.     /* measure text height to calculate text_height (or the maximum text height) */
  295.     FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
  296.  
  297.     /* cache the newly created glyph */
  298.     if (!(node = av_tree_node_alloc())) {
  299.         ret = AVERROR(ENOMEM);
  300.         goto error;
  301.     }
  302.     av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
  303.  
  304.     if (glyph_ptr)
  305.         *glyph_ptr = glyph;
  306.     return 0;
  307.  
  308. error:
  309.     if (glyph)
  310.         av_freep(&glyph->glyph);
  311.     av_freep(&glyph);
  312.     av_freep(&node);
  313.     return ret;
  314. }
  315.  
  316. static int load_font_file(AVFilterContext *ctx, const char *path, int index,
  317.                           const char **error)
  318. {
  319.     DrawTextContext *s = ctx->priv;
  320.     int err;
  321.  
  322.     err = FT_New_Face(s->library, path, index, &s->face);
  323.     if (err) {
  324.         *error = FT_ERRMSG(err);
  325.         return AVERROR(EINVAL);
  326.     }
  327.     return 0;
  328. }
  329.  
  330. #if CONFIG_FONTCONFIG
  331. static int load_font_fontconfig(AVFilterContext *ctx, const char **error)
  332. {
  333.     DrawTextContext *s = ctx->priv;
  334.     FcConfig *fontconfig;
  335.     FcPattern *pattern, *fpat;
  336.     FcResult result = FcResultMatch;
  337.     FcChar8 *filename;
  338.     int err, index;
  339.     double size;
  340.  
  341.     fontconfig = FcInitLoadConfigAndFonts();
  342.     if (!fontconfig) {
  343.         *error = "impossible to init fontconfig\n";
  344.         return AVERROR(EINVAL);
  345.     }
  346.     pattern = FcNameParse(s->fontfile ? s->fontfile :
  347.                           (uint8_t *)(intptr_t)"default");
  348.     if (!pattern) {
  349.         *error = "could not parse fontconfig pattern";
  350.         return AVERROR(EINVAL);
  351.     }
  352.     if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) {
  353.         *error = "could not substitue fontconfig options"; /* very unlikely */
  354.         return AVERROR(EINVAL);
  355.     }
  356.     FcDefaultSubstitute(pattern);
  357.     fpat = FcFontMatch(fontconfig, pattern, &result);
  358.     if (!fpat || result != FcResultMatch) {
  359.         *error = "impossible to find a matching font";
  360.         return AVERROR(EINVAL);
  361.     }
  362.     if (FcPatternGetString (fpat, FC_FILE,  0, &filename) != FcResultMatch ||
  363.         FcPatternGetInteger(fpat, FC_INDEX, 0, &index   ) != FcResultMatch ||
  364.         FcPatternGetDouble (fpat, FC_SIZE,  0, &size    ) != FcResultMatch) {
  365.         *error = "impossible to find font information";
  366.         return AVERROR(EINVAL);
  367.     }
  368.     av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
  369.     if (!s->fontsize)
  370.         s->fontsize = size + 0.5;
  371.     err = load_font_file(ctx, filename, index, error);
  372.     if (err)
  373.         return err;
  374.     FcPatternDestroy(fpat);
  375.     FcPatternDestroy(pattern);
  376.     FcConfigDestroy(fontconfig);
  377.     return 0;
  378. }
  379. #endif
  380.  
  381. static int load_font(AVFilterContext *ctx)
  382. {
  383.     DrawTextContext *s = ctx->priv;
  384.     int err;
  385.     const char *error = "unknown error\n";
  386.  
  387.     /* load the face, and set up the encoding, which is by default UTF-8 */
  388.     err = load_font_file(ctx, s->fontfile, 0, &error);
  389.     if (!err)
  390.         return 0;
  391. #if CONFIG_FONTCONFIG
  392.     err = load_font_fontconfig(ctx, &error);
  393.     if (!err)
  394.         return 0;
  395. #endif
  396.     av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
  397.            s->fontfile, error);
  398.     return err;
  399. }
  400.  
  401. static int load_textfile(AVFilterContext *ctx)
  402. {
  403.     DrawTextContext *s = ctx->priv;
  404.     int err;
  405.     uint8_t *textbuf;
  406.     size_t textbuf_size;
  407.  
  408.     if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
  409.         av_log(ctx, AV_LOG_ERROR,
  410.                "The text file '%s' could not be read or is empty\n",
  411.                s->textfile);
  412.         return err;
  413.     }
  414.  
  415.     if (!(s->text = av_realloc(s->text, textbuf_size + 1)))
  416.         return AVERROR(ENOMEM);
  417.     memcpy(s->text, textbuf, textbuf_size);
  418.     s->text[textbuf_size] = 0;
  419.     av_file_unmap(textbuf, textbuf_size);
  420.  
  421.     return 0;
  422. }
  423.  
  424. static av_cold int init(AVFilterContext *ctx)
  425. {
  426.     int err;
  427.     DrawTextContext *s = ctx->priv;
  428.     Glyph *glyph;
  429.  
  430. #if FF_API_DRAWTEXT_OLD_TIMELINE
  431.     if (s->draw_expr)
  432.         av_log(ctx, AV_LOG_WARNING, "'draw' option is deprecated and will be removed soon, "
  433.                "you are encouraged to use the generic timeline support through the 'enable' option\n");
  434. #endif
  435.  
  436.     if (!s->fontfile && !CONFIG_FONTCONFIG) {
  437.         av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
  438.         return AVERROR(EINVAL);
  439.     }
  440.  
  441.     if (s->textfile) {
  442.         if (s->text) {
  443.             av_log(ctx, AV_LOG_ERROR,
  444.                    "Both text and text file provided. Please provide only one\n");
  445.             return AVERROR(EINVAL);
  446.         }
  447.         if ((err = load_textfile(ctx)) < 0)
  448.             return err;
  449.     }
  450.  
  451.     if (s->reload && !s->textfile)
  452.         av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
  453.  
  454.     if (s->tc_opt_string) {
  455.         int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,
  456.                                                s->tc_opt_string, ctx);
  457.         if (ret < 0)
  458.             return ret;
  459.         if (s->tc24hmax)
  460.             s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
  461.         if (!s->text)
  462.             s->text = av_strdup("");
  463.     }
  464.  
  465.     if (!s->text) {
  466.         av_log(ctx, AV_LOG_ERROR,
  467.                "Either text, a valid file or a timecode must be provided\n");
  468.         return AVERROR(EINVAL);
  469.     }
  470.  
  471.     if ((err = FT_Init_FreeType(&(s->library)))) {
  472.         av_log(ctx, AV_LOG_ERROR,
  473.                "Could not load FreeType: %s\n", FT_ERRMSG(err));
  474.         return AVERROR(EINVAL);
  475.     }
  476.  
  477.     err = load_font(ctx);
  478.     if (err)
  479.         return err;
  480.     if (!s->fontsize)
  481.         s->fontsize = 16;
  482.     if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
  483.         av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
  484.                s->fontsize, FT_ERRMSG(err));
  485.         return AVERROR(EINVAL);
  486.     }
  487.  
  488.     s->use_kerning = FT_HAS_KERNING(s->face);
  489.  
  490.     /* load the fallback glyph with code 0 */
  491.     load_glyph(ctx, NULL, 0);
  492.  
  493.     /* set the tabsize in pixels */
  494.     if ((err = load_glyph(ctx, &glyph, ' ')) < 0) {
  495.         av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n");
  496.         return err;
  497.     }
  498.     s->tabsize *= glyph->advance;
  499.  
  500.     if (s->exp_mode == EXP_STRFTIME &&
  501.         (strchr(s->text, '%') || strchr(s->text, '\\')))
  502.         av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
  503.  
  504.     av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
  505.  
  506.     return 0;
  507. }
  508.  
  509. static int query_formats(AVFilterContext *ctx)
  510. {
  511.     ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
  512.     return 0;
  513. }
  514.  
  515. static int glyph_enu_free(void *opaque, void *elem)
  516. {
  517.     Glyph *glyph = elem;
  518.  
  519.     FT_Done_Glyph(*glyph->glyph);
  520.     av_freep(&glyph->glyph);
  521.     av_free(elem);
  522.     return 0;
  523. }
  524.  
  525. static av_cold void uninit(AVFilterContext *ctx)
  526. {
  527.     DrawTextContext *s = ctx->priv;
  528.  
  529.     av_expr_free(s->x_pexpr);
  530.     av_expr_free(s->y_pexpr);
  531. #if FF_API_DRAWTEXT_OLD_TIMELINE
  532.     av_expr_free(s->draw_pexpr);
  533.     s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
  534. #endif
  535.     av_freep(&s->positions);
  536.     s->nb_positions = 0;
  537.  
  538.  
  539.     av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);
  540.     av_tree_destroy(s->glyphs);
  541.     s->glyphs = NULL;
  542.  
  543.     FT_Done_Face(s->face);
  544.     FT_Done_FreeType(s->library);
  545.  
  546.     av_bprint_finalize(&s->expanded_text, NULL);
  547. }
  548.  
  549. static inline int is_newline(uint32_t c)
  550. {
  551.     return c == '\n' || c == '\r' || c == '\f' || c == '\v';
  552. }
  553.  
  554. static int config_input(AVFilterLink *inlink)
  555. {
  556.     AVFilterContext *ctx = inlink->dst;
  557.     DrawTextContext *s = ctx->priv;
  558.     int ret;
  559.  
  560.     ff_draw_init(&s->dc, inlink->format, 0);
  561.     ff_draw_color(&s->dc, &s->fontcolor,   s->fontcolor.rgba);
  562.     ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
  563.     ff_draw_color(&s->dc, &s->boxcolor,    s->boxcolor.rgba);
  564.  
  565.     s->var_values[VAR_w]     = s->var_values[VAR_W]     = s->var_values[VAR_MAIN_W] = inlink->w;
  566.     s->var_values[VAR_h]     = s->var_values[VAR_H]     = s->var_values[VAR_MAIN_H] = inlink->h;
  567.     s->var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
  568.     s->var_values[VAR_DAR]   = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
  569.     s->var_values[VAR_HSUB]  = 1 << s->dc.hsub_max;
  570.     s->var_values[VAR_VSUB]  = 1 << s->dc.vsub_max;
  571.     s->var_values[VAR_X]     = NAN;
  572.     s->var_values[VAR_Y]     = NAN;
  573.     s->var_values[VAR_T]     = NAN;
  574.  
  575.     av_lfg_init(&s->prng, av_get_random_seed());
  576.  
  577.     av_expr_free(s->x_pexpr);
  578.     av_expr_free(s->y_pexpr);
  579. #if FF_API_DRAWTEXT_OLD_TIMELINE
  580.     av_expr_free(s->draw_pexpr);
  581.     s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;
  582. #else
  583.     s->x_pexpr = s->y_pexpr = NULL;
  584. #endif
  585.  
  586.     if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,
  587.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
  588.         (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,
  589.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
  590.  
  591.         return AVERROR(EINVAL);
  592. #if FF_API_DRAWTEXT_OLD_TIMELINE
  593.     if (s->draw_expr &&
  594.         (ret = av_expr_parse(&s->draw_pexpr, s->draw_expr, var_names,
  595.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
  596.         return ret;
  597. #endif
  598.  
  599.     return 0;
  600. }
  601.  
  602. static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
  603. {
  604.     DrawTextContext *s = ctx->priv;
  605.  
  606.     if (!strcmp(cmd, "reinit")) {
  607.         int ret;
  608.         uninit(ctx);
  609.         s->reinit = 1;
  610.         if ((ret = init(ctx)) < 0)
  611.             return ret;
  612.         return config_input(ctx->inputs[0]);
  613.     }
  614.  
  615.     return AVERROR(ENOSYS);
  616. }
  617.  
  618. static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,
  619.                           char *fct, unsigned argc, char **argv, int tag)
  620. {
  621.     DrawTextContext *s = ctx->priv;
  622.  
  623.     av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
  624.     return 0;
  625. }
  626.  
  627. static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
  628.                     char *fct, unsigned argc, char **argv, int tag)
  629. {
  630.     DrawTextContext *s = ctx->priv;
  631.  
  632.     av_bprintf(bp, "%.6f", s->var_values[VAR_T]);
  633.     return 0;
  634. }
  635.  
  636. static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
  637.                           char *fct, unsigned argc, char **argv, int tag)
  638. {
  639.     DrawTextContext *s = ctx->priv;
  640.  
  641.     av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
  642.     return 0;
  643. }
  644.  
  645. static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
  646.                          char *fct, unsigned argc, char **argv, int tag)
  647. {
  648.     DrawTextContext *s = ctx->priv;
  649.     AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);
  650.  
  651.     if (e && e->value)
  652.         av_bprintf(bp, "%s", e->value);
  653.     return 0;
  654. }
  655.  
  656. #if !HAVE_LOCALTIME_R
  657. static void localtime_r(const time_t *t, struct tm *tm)
  658. {
  659.     *tm = *localtime(t);
  660. }
  661. #endif
  662.  
  663. static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,
  664.                          char *fct, unsigned argc, char **argv, int tag)
  665. {
  666.     const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";
  667.     time_t now;
  668.     struct tm tm;
  669.  
  670.     time(&now);
  671.     if (tag == 'L')
  672.         localtime_r(&now, &tm);
  673.     else
  674.         tm = *gmtime(&now);
  675.     av_bprint_strftime(bp, fmt, &tm);
  676.     return 0;
  677. }
  678.  
  679. static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,
  680.                           char *fct, unsigned argc, char **argv, int tag)
  681. {
  682.     DrawTextContext *s = ctx->priv;
  683.     double res;
  684.     int ret;
  685.  
  686.     ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,
  687.                                  NULL, NULL, fun2_names, fun2,
  688.                                  &s->prng, 0, ctx);
  689.     if (ret < 0)
  690.         av_log(ctx, AV_LOG_ERROR,
  691.                "Expression '%s' for the expr text expansion function is not valid\n",
  692.                argv[0]);
  693.     else
  694.         av_bprintf(bp, "%f", res);
  695.  
  696.     return ret;
  697. }
  698.  
  699. static const struct drawtext_function {
  700.     const char *name;
  701.     unsigned argc_min, argc_max;
  702.     int tag;                            /**< opaque argument to func */
  703.     int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);
  704. } functions[] = {
  705.     { "expr",      1, 1, 0,   func_eval_expr },
  706.     { "e",         1, 1, 0,   func_eval_expr },
  707.     { "pict_type", 0, 0, 0,   func_pict_type },
  708.     { "pts",       0, 0, 0,   func_pts      },
  709.     { "gmtime",    0, 1, 'G', func_strftime },
  710.     { "localtime", 0, 1, 'L', func_strftime },
  711.     { "frame_num", 0, 0, 0,   func_frame_num },
  712.     { "n",         0, 0, 0,   func_frame_num },
  713.     { "metadata",  1, 1, 0,   func_metadata },
  714. };
  715.  
  716. static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,
  717.                          unsigned argc, char **argv)
  718. {
  719.     unsigned i;
  720.  
  721.     for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {
  722.         if (strcmp(fct, functions[i].name))
  723.             continue;
  724.         if (argc < functions[i].argc_min) {
  725.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",
  726.                    fct, functions[i].argc_min);
  727.             return AVERROR(EINVAL);
  728.         }
  729.         if (argc > functions[i].argc_max) {
  730.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",
  731.                    fct, functions[i].argc_max);
  732.             return AVERROR(EINVAL);
  733.         }
  734.         break;
  735.     }
  736.     if (i >= FF_ARRAY_ELEMS(functions)) {
  737.         av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);
  738.         return AVERROR(EINVAL);
  739.     }
  740.     return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);
  741. }
  742.  
  743. static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)
  744. {
  745.     const char *text = *rtext;
  746.     char *argv[16] = { NULL };
  747.     unsigned argc = 0, i;
  748.     int ret;
  749.  
  750.     if (*text != '{') {
  751.         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);
  752.         return AVERROR(EINVAL);
  753.     }
  754.     text++;
  755.     while (1) {
  756.         if (!(argv[argc++] = av_get_token(&text, ":}"))) {
  757.             ret = AVERROR(ENOMEM);
  758.             goto end;
  759.         }
  760.         if (!*text) {
  761.             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);
  762.             ret = AVERROR(EINVAL);
  763.             goto end;
  764.         }
  765.         if (argc == FF_ARRAY_ELEMS(argv))
  766.             av_freep(&argv[--argc]); /* error will be caught later */
  767.         if (*text == '}')
  768.             break;
  769.         text++;
  770.     }
  771.  
  772.     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)
  773.         goto end;
  774.     ret = 0;
  775.     *rtext = (char *)text + 1;
  776.  
  777. end:
  778.     for (i = 0; i < argc; i++)
  779.         av_freep(&argv[i]);
  780.     return ret;
  781. }
  782.  
  783. static int expand_text(AVFilterContext *ctx)
  784. {
  785.     DrawTextContext *s = ctx->priv;
  786.     char *text = s->text;
  787.     AVBPrint *bp = &s->expanded_text;
  788.     int ret;
  789.  
  790.     av_bprint_clear(bp);
  791.     while (*text) {
  792.         if (*text == '\\' && text[1]) {
  793.             av_bprint_chars(bp, text[1], 1);
  794.             text += 2;
  795.         } else if (*text == '%') {
  796.             text++;
  797.             if ((ret = expand_function(ctx, bp, &text)) < 0)
  798.                 return ret;
  799.         } else {
  800.             av_bprint_chars(bp, *text, 1);
  801.             text++;
  802.         }
  803.     }
  804.     if (!av_bprint_is_complete(bp))
  805.         return AVERROR(ENOMEM);
  806.     return 0;
  807. }
  808.  
  809. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,
  810.                        int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
  811. {
  812.     char *text = s->expanded_text.str;
  813.     uint32_t code = 0;
  814.     int i, x1, y1;
  815.     uint8_t *p;
  816.     Glyph *glyph = NULL;
  817.  
  818.     for (i = 0, p = text; *p; i++) {
  819.         Glyph dummy = { 0 };
  820.         GET_UTF8(code, *p++, continue;);
  821.  
  822.         /* skip new line chars, just go to new line */
  823.         if (code == '\n' || code == '\r' || code == '\t')
  824.             continue;
  825.  
  826.         dummy.code = code;
  827.         glyph = av_tree_find(s->glyphs, &dummy, (void *)glyph_cmp, NULL);
  828.  
  829.         if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
  830.             glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
  831.             return AVERROR(EINVAL);
  832.  
  833.         x1 = s->positions[i].x+s->x+x;
  834.         y1 = s->positions[i].y+s->y+y;
  835.  
  836.         ff_blend_mask(&s->dc, color,
  837.                       frame->data, frame->linesize, width, height,
  838.                       glyph->bitmap.buffer, glyph->bitmap.pitch,
  839.                       glyph->bitmap.width, glyph->bitmap.rows,
  840.                       glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
  841.                       0, x1, y1);
  842.     }
  843.  
  844.     return 0;
  845. }
  846.  
  847. static int draw_text(AVFilterContext *ctx, AVFrame *frame,
  848.                      int width, int height)
  849. {
  850.     DrawTextContext *s = ctx->priv;
  851.     AVFilterLink *inlink = ctx->inputs[0];
  852.  
  853.     uint32_t code = 0, prev_code = 0;
  854.     int x = 0, y = 0, i = 0, ret;
  855.     int max_text_line_w = 0, len;
  856.     int box_w, box_h;
  857.     char *text;
  858.     uint8_t *p;
  859.     int y_min = 32000, y_max = -32000;
  860.     int x_min = 32000, x_max = -32000;
  861.     FT_Vector delta;
  862.     Glyph *glyph = NULL, *prev_glyph = NULL;
  863.     Glyph dummy = { 0 };
  864.  
  865.     time_t now = time(0);
  866.     struct tm ltime;
  867.     AVBPrint *bp = &s->expanded_text;
  868.  
  869.     av_bprint_clear(bp);
  870.  
  871.     if(s->basetime != AV_NOPTS_VALUE)
  872.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;
  873.  
  874.     switch (s->exp_mode) {
  875.     case EXP_NONE:
  876.         av_bprintf(bp, "%s", s->text);
  877.         break;
  878.     case EXP_NORMAL:
  879.         if ((ret = expand_text(ctx)) < 0)
  880.             return ret;
  881.         break;
  882.     case EXP_STRFTIME:
  883.         localtime_r(&now, &ltime);
  884.         av_bprint_strftime(bp, s->text, &ltime);
  885.         break;
  886.     }
  887.  
  888.     if (s->tc_opt_string) {
  889.         char tcbuf[AV_TIMECODE_STR_SIZE];
  890.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);
  891.         av_bprint_clear(bp);
  892.         av_bprintf(bp, "%s%s", s->text, tcbuf);
  893.     }
  894.  
  895.     if (!av_bprint_is_complete(bp))
  896.         return AVERROR(ENOMEM);
  897.     text = s->expanded_text.str;
  898.     if ((len = s->expanded_text.len) > s->nb_positions) {
  899.         if (!(s->positions =
  900.               av_realloc(s->positions, len*sizeof(*s->positions))))
  901.             return AVERROR(ENOMEM);
  902.         s->nb_positions = len;
  903.     }
  904.  
  905.     x = 0;
  906.     y = 0;
  907.  
  908.     /* load and cache glyphs */
  909.     for (i = 0, p = text; *p; i++) {
  910.         GET_UTF8(code, *p++, continue;);
  911.  
  912.         /* get glyph */
  913.         dummy.code = code;
  914.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
  915.         if (!glyph) {
  916.             load_glyph(ctx, &glyph, code);
  917.         }
  918.  
  919.         y_min = FFMIN(glyph->bbox.yMin, y_min);
  920.         y_max = FFMAX(glyph->bbox.yMax, y_max);
  921.         x_min = FFMIN(glyph->bbox.xMin, x_min);
  922.         x_max = FFMAX(glyph->bbox.xMax, x_max);
  923.     }
  924.     s->max_glyph_h = y_max - y_min;
  925.     s->max_glyph_w = x_max - x_min;
  926.  
  927.     /* compute and save position for each glyph */
  928.     glyph = NULL;
  929.     for (i = 0, p = text; *p; i++) {
  930.         GET_UTF8(code, *p++, continue;);
  931.  
  932.         /* skip the \n in the sequence \r\n */
  933.         if (prev_code == '\r' && code == '\n')
  934.             continue;
  935.  
  936.         prev_code = code;
  937.         if (is_newline(code)) {
  938.  
  939.             max_text_line_w = FFMAX(max_text_line_w, x);
  940.             y += s->max_glyph_h;
  941.             x = 0;
  942.             continue;
  943.         }
  944.  
  945.         /* get glyph */
  946.         prev_glyph = glyph;
  947.         dummy.code = code;
  948.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
  949.  
  950.         /* kerning */
  951.         if (s->use_kerning && prev_glyph && glyph->code) {
  952.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,
  953.                            ft_kerning_default, &delta);
  954.             x += delta.x >> 6;
  955.         }
  956.  
  957.         /* save position */
  958.         s->positions[i].x = x + glyph->bitmap_left;
  959.         s->positions[i].y = y - glyph->bitmap_top + y_max;
  960.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;
  961.         else              x += glyph->advance;
  962.     }
  963.  
  964.     max_text_line_w = FFMAX(x, max_text_line_w);
  965.  
  966.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;
  967.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;
  968.  
  969.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;
  970.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;
  971.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;
  972.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;
  973.  
  974.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;
  975.  
  976.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
  977.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
  978.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
  979. #if FF_API_DRAWTEXT_OLD_TIMELINE
  980.     if (s->draw_pexpr){
  981.     s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);
  982.  
  983.     if(!s->draw)
  984.         return 0;
  985.     }
  986.     if (ctx->is_disabled)
  987.         return 0;
  988. #endif
  989.  
  990.     box_w = FFMIN(width - 1 , max_text_line_w);
  991.     box_h = FFMIN(height - 1, y + s->max_glyph_h);
  992.  
  993.     /* draw box */
  994.     if (s->draw_box)
  995.         ff_blend_rectangle(&s->dc, &s->boxcolor,
  996.                            frame->data, frame->linesize, width, height,
  997.                            s->x, s->y, box_w, box_h);
  998.  
  999.     if (s->shadowx || s->shadowy) {
  1000.         if ((ret = draw_glyphs(s, frame, width, height, s->shadowcolor.rgba,
  1001.                                &s->shadowcolor, s->shadowx, s->shadowy)) < 0)
  1002.             return ret;
  1003.     }
  1004.  
  1005.     if ((ret = draw_glyphs(s, frame, width, height, s->fontcolor.rgba,
  1006.                            &s->fontcolor, 0, 0)) < 0)
  1007.         return ret;
  1008.  
  1009.     return 0;
  1010. }
  1011.  
  1012. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
  1013. {
  1014.     AVFilterContext *ctx = inlink->dst;
  1015.     AVFilterLink *outlink = ctx->outputs[0];
  1016.     DrawTextContext *s = ctx->priv;
  1017.     int ret;
  1018.  
  1019.     if (s->reload)
  1020.         if ((ret = load_textfile(ctx)) < 0)
  1021.             return ret;
  1022.  
  1023.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;
  1024.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
  1025.         NAN : frame->pts * av_q2d(inlink->time_base);
  1026.  
  1027.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;
  1028.     s->metadata = av_frame_get_metadata(frame);
  1029.  
  1030.     draw_text(ctx, frame, frame->width, frame->height);
  1031.  
  1032.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
  1033.            (int)s->var_values[VAR_N], s->var_values[VAR_T],
  1034.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],
  1035.            s->x, s->y);
  1036.  
  1037.     return ff_filter_frame(outlink, frame);
  1038. }
  1039.  
  1040. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
  1041.     {
  1042.         .name           = "default",
  1043.         .type           = AVMEDIA_TYPE_VIDEO,
  1044.         .filter_frame   = filter_frame,
  1045.         .config_props   = config_input,
  1046.         .needs_writable = 1,
  1047.     },
  1048.     { NULL }
  1049. };
  1050.  
  1051. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
  1052.     {
  1053.         .name = "default",
  1054.         .type = AVMEDIA_TYPE_VIDEO,
  1055.     },
  1056.     { NULL }
  1057. };
  1058.  
  1059. AVFilter avfilter_vf_drawtext = {
  1060.     .name          = "drawtext",
  1061.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
  1062.     .priv_size     = sizeof(DrawTextContext),
  1063.     .priv_class    = &drawtext_class,
  1064.     .init          = init,
  1065.     .uninit        = uninit,
  1066.     .query_formats = query_formats,
  1067.     .inputs        = avfilter_vf_drawtext_inputs,
  1068.     .outputs       = avfilter_vf_drawtext_outputs,
  1069.     .process_command = command,
  1070. #if FF_API_DRAWTEXT_OLD_TIMELINE
  1071.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
  1072. #else
  1073.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
  1074. #endif
  1075. };
  1076.