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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 "config.h"

  30. 

  31. #if HAVE_SYS_TIME_H

  32. #include <sys/time.h>

  33. #endif

  34. #include <sys/types.h>

  35. #include <sys/stat.h>

  36. #include <time.h>

  37. #include <unistd.h>

  38. 

  39. #if CONFIG_LIBFONTCONFIG

  40. #include <fontconfig/fontconfig.h>

  41. #endif

  42. 

  43. #include "libavutil/avstring.h"

  44. #include "libavutil/bprint.h"

  45. #include "libavutil/common.h"

  46. #include "libavutil/file.h"

  47. #include "libavutil/eval.h"

  48. #include "libavutil/opt.h"

  49. #include "libavutil/random_seed.h"

  50. #include "libavutil/parseutils.h"

  51. #include "libavutil/timecode.h"

  52. #include "libavutil/tree.h"

  53. #include "libavutil/lfg.h"

  54. #include "avfilter.h"

  55. #include "drawutils.h"

  56. #include "formats.h"

  57. #include "internal.h"

  58. #include "video.h"

  59. 

  60. #include <ft2build.h>

  61. #include FT_FREETYPE_H

  62. #include FT_GLYPH_H

  63. #include FT_STROKER_H

  64. 

  65. static const char *const var_names[] = {

  66.     "dar",

  67.     "hsub", "vsub",

  68.     "line_h", "lh",           ///< line height, same as max_glyph_h

  69.     "main_h", "h", "H",       ///< height of the input video

  70.     "main_w", "w", "W",       ///< width  of the input video

  71.     "max_glyph_a", "ascent",  ///< max glyph ascent

  72.     "max_glyph_d", "descent", ///< min glyph descent

  73.     "max_glyph_h",            ///< max glyph height

  74.     "max_glyph_w",            ///< max glyph width

  75.     "n",                      ///< number of frame

  76.     "sar",

  77.     "t",                      ///< timestamp expressed in seconds

  78.     "text_h", "th",           ///< height of the rendered text

  79.     "text_w", "tw",           ///< width  of the rendered text

  80.     "x",

  81.     "y",

  82.     "pict_type",

  83.     NULL

  84. };

  85. 

  86. static const char *const fun2_names[] = {

  87.     "rand"

  88. };

  89. 

  90. static double drand(void *opaque, double min, double max)

  91. {

  92.     return min + (max-min) / UINT_MAX * av_lfg_get(opaque);

  93. }

  94. 

  95. typedef double (*eval_func2)(void *, double a, double b);

  96. 

  97. static const eval_func2 fun2[] = {

  98.     drand,

  99.     NULL

  100. };

  101. 

  102. enum var_name {

  103.     VAR_DAR,

  104.     VAR_HSUB, VAR_VSUB,

  105.     VAR_LINE_H, VAR_LH,

  106.     VAR_MAIN_H, VAR_h, VAR_H,

  107.     VAR_MAIN_W, VAR_w, VAR_W,

  108.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  109.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  110.     VAR_MAX_GLYPH_H,

  111.     VAR_MAX_GLYPH_W,

  112.     VAR_N,

  113.     VAR_SAR,

  114.     VAR_T,

  115.     VAR_TEXT_H, VAR_TH,

  116.     VAR_TEXT_W, VAR_TW,

  117.     VAR_X,

  118.     VAR_Y,

  119.     VAR_PICT_TYPE,

  120.     VAR_VARS_NB

  121. };

  122. 

  123. enum expansion_mode {

  124.     EXP_NONE,

  125.     EXP_NORMAL,

  126.     EXP_STRFTIME,

  127. };

  128. 

  129. typedef struct DrawTextContext {

  130.     const AVClass *class;

  131.     enum expansion_mode exp_mode;   ///< expansion mode to use for the text

  132.     int reinit;                     ///< tells if the filter is being reinited

  133. #if CONFIG_LIBFONTCONFIG

  134.     uint8_t *font;              ///< font to be used

  135. #endif

  136.     uint8_t *fontfile;              ///< font to be used

  137.     uint8_t *text;                  ///< text to be drawn

  138.     AVBPrint expanded_text;         ///< used to contain the expanded text

  139.     int ft_load_flags;              ///< flags used for loading fonts, see FT_LOAD_*

  140.     FT_Vector *positions;           ///< positions for each element in the text

  141.     size_t nb_positions;            ///< number of elements of positions array

  142.     char *textfile;                 ///< file with text to be drawn

  143.     int x;                          ///< x position to start drawing text

  144.     int y;                          ///< y position to start drawing text

  145.     int max_glyph_w;                ///< max glyph width

  146.     int max_glyph_h;                ///< max glyph height

  147.     int shadowx, shadowy;

  148.     int borderw;                    ///< border width

  149.     unsigned int fontsize;          ///< font size to use

  150. 

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

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

  153.     int tabsize;                    ///< tab size

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

  155. 

  156.     FFDrawContext dc;

  157.     FFDrawColor fontcolor;          ///< foreground color

  158.     FFDrawColor shadowcolor;        ///< shadow color

  159.     FFDrawColor bordercolor;        ///< border color

  160.     FFDrawColor boxcolor;           ///< background color

  161. 

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

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

  164.     FT_Stroker stroker;             ///< freetype stroker handle

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

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

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

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

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

  170.     double var_values[VAR_VARS_NB];

  171. #if FF_API_DRAWTEXT_OLD_TIMELINE

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

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

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

  175. #endif

  176.     AVLFG  prng;                    ///< random

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

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

  179.     AVTimecode  tc;                 ///< timecode context

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

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

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

  183.     AVDictionary *metadata;

  184. } DrawTextContext;

  185. 

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

  187. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  188. 

  189. static const AVOption drawtext_options[]= {

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

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

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

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

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

  195.     {"bordercolor", "set border color",     OFFSET(bordercolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

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

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

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

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

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

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

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

  203.     {"borderw",     "set border width",     OFFSET(borderw),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},

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

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

  206. #if FF_API_DRAWTEXT_OLD_TIMELINE

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

  208. #endif

  209. #if CONFIG_LIBFONTCONFIG

  210.     { "font",        "Font name",            OFFSET(font),               AV_OPT_TYPE_STRING, { .str = "Sans" },           .flags = FLAGS },

  211. #endif

  212. 

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

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

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

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

  217. 

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

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

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

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

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

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

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

  225.     {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},

  226. 

  227.     /* FT_LOAD_* flags */

  228.     { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 0, INT_MAX, FLAGS, "ft_load_flags" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  244.     { NULL }

  245. };

  246. 

  247. AVFILTER_DEFINE_CLASS(drawtext);

  248. 

  249. #undef __FTERRORS_H__

  250. #define FT_ERROR_START_LIST {

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

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

  253. 

  254. struct ft_error

  255. {

  256.     int err;

  257.     const char *err_msg;

  258. } static ft_errors[] =

  259. #include FT_ERRORS_H

  260. 

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

  262. 

  263. typedef struct Glyph {

  264.     FT_Glyph glyph;

  265.     FT_Glyph border_glyph;

  266.     uint32_t code;

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

  268.     FT_Bitmap border_bitmap; ///< array holding bitmaps of font border

  269.     FT_BBox bbox;

  270.     int advance;

  271.     int bitmap_left;

  272.     int bitmap_top;

  273. } Glyph;

  274. 

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

  276. {

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

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

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

  280. }

  281. 

  282. /**

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

  284.  */

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

  286. {

  287.     DrawTextContext *s = ctx->priv;

  288.     FT_BitmapGlyph bitmapglyph;

  289.     Glyph *glyph;

  290.     struct AVTreeNode *node = NULL;

  291.     int ret;

  292. 

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

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

  295.         return AVERROR(EINVAL);

  296. 

  297.     glyph = av_mallocz(sizeof(*glyph));

  298.     if (!glyph) {

  299.         ret = AVERROR(ENOMEM);

  300.         goto error;

  301.     }

  302.     glyph->code  = code;

  303. 

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

  305.         ret = AVERROR(EINVAL);

  306.         goto error;

  307.     }

  308.     if (s->borderw) {

  309.         glyph->border_glyph = glyph->glyph;

  310.         if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||

  311.             FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {

  312.             ret = AVERROR_EXTERNAL;

  313.             goto error;

  314.         }

  315.         bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;

  316.         glyph->border_bitmap = bitmapglyph->bitmap;

  317.     }

  318.     if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {

  319.         ret = AVERROR_EXTERNAL;

  320.         goto error;

  321.     }

  322.     bitmapglyph = (FT_BitmapGlyph) glyph->glyph;

  323. 

  324.     glyph->bitmap      = bitmapglyph->bitmap;

  325.     glyph->bitmap_left = bitmapglyph->left;

  326.     glyph->bitmap_top  = bitmapglyph->top;

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

  328. 

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

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

  331. 

  332.     /* cache the newly created glyph */

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

  334.         ret = AVERROR(ENOMEM);

  335.         goto error;

  336.     }

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

  338. 

  339.     if (glyph_ptr)

  340.         *glyph_ptr = glyph;

  341.     return 0;

  342. 

  343. error:

  344.     if (glyph)

  345.         av_freep(&glyph->glyph);

  346. 

  347.     av_freep(&glyph);

  348.     av_freep(&node);

  349.     return ret;

  350. }

  351. 

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

  353. {

  354.     DrawTextContext *s = ctx->priv;

  355.     int err;

  356. 

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

  358.     if (err) {

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

  360.                s->fontfile, FT_ERRMSG(err));

  361.         return AVERROR(EINVAL);

  362.     }

  363.     return 0;

  364. }

  365. 

  366. #if CONFIG_LIBFONTCONFIG

  367. static int load_font_fontconfig(AVFilterContext *ctx)

  368. {

  369.     DrawTextContext *s = ctx->priv;

  370.     FcConfig *fontconfig;

  371.     FcPattern *pat, *best;

  372.     FcResult result = FcResultMatch;

  373.     FcChar8 *filename;

  374.     int index;

  375.     double size;

  376.     int err = AVERROR(ENOENT);

  377. 

  378.     fontconfig = FcInitLoadConfigAndFonts();

  379.     if (!fontconfig) {

  380.         av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");

  381.         return AVERROR_UNKNOWN;

  382.     }

  383.     pat = FcNameParse(s->fontfile ? s->fontfile :

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

  385.     if (!pat) {

  386.         av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");

  387.         return AVERROR(EINVAL);

  388.     }

  389. 

  390.     FcPatternAddString(pat, FC_FAMILY, s->font);

  391.     if (s->fontsize)

  392.         FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);

  393. 

  394.     FcDefaultSubstitute(pat);

  395. 

  396.     if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {

  397.         av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */

  398.         FcPatternDestroy(pat);

  399.         return AVERROR(ENOMEM);

  400.     }

  401. 

  402.     best = FcFontMatch(fontconfig, pat, &result);

  403.     FcPatternDestroy(pat);

  404. 

  405.     if (!best || result != FcResultMatch) {

  406.         av_log(ctx, AV_LOG_ERROR,

  407.                "Cannot find a valid font for the family %s\n",

  408.                s->font);

  409.         goto fail;

  410.     }

  411. 

  412.     if (

  413.         FcPatternGetInteger(best, FC_INDEX, 0, &index   ) != FcResultMatch ||

  414.         FcPatternGetDouble (best, FC_SIZE,  0, &size    ) != FcResultMatch) {

  415.         av_log(ctx, AV_LOG_ERROR, "impossible to find font information");

  416.         return AVERROR(EINVAL);

  417.     }

  418. 

  419.     if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {

  420.         av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",

  421.                s->font);

  422.         goto fail;

  423.     }

  424. 

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

  426.     if (!s->fontsize)

  427.         s->fontsize = size + 0.5;

  428. 

  429.     err = load_font_file(ctx, filename, index);

  430.     if (err)

  431.         return err;

  432.     FcConfigDestroy(fontconfig);

  433. fail:

  434.     FcPatternDestroy(best);

  435.     return err;

  436. }

  437. #endif

  438. 

  439. static int load_font(AVFilterContext *ctx)

  440. {

  441.     DrawTextContext *s = ctx->priv;

  442.     int err;

  443. 

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

  445.     err = load_font_file(ctx, s->fontfile, 0);

  446.     if (!err)

  447.         return 0;

  448. #if CONFIG_LIBFONTCONFIG

  449.     err = load_font_fontconfig(ctx);

  450.     if (!err)

  451.         return 0;

  452. #endif

  453.     return err;

  454. }

  455. 

  456. static int load_textfile(AVFilterContext *ctx)

  457. {

  458.     DrawTextContext *s = ctx->priv;

  459.     int err;

  460.     uint8_t *textbuf;

  461.     uint8_t *tmp;

  462.     size_t textbuf_size;

  463. 

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

  465.         av_log(ctx, AV_LOG_ERROR,

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

  467.                s->textfile);

  468.         return err;

  469.     }

  470. 

  471.     if (!(tmp = av_realloc(s->text, textbuf_size + 1))) {

  472.         av_file_unmap(textbuf, textbuf_size);

  473.         return AVERROR(ENOMEM);

  474.     }

  475.     s->text = tmp;

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

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

  478.     av_file_unmap(textbuf, textbuf_size);

  479. 

  480.     return 0;

  481. }

  482. 

  483. static av_cold int init(AVFilterContext *ctx)

  484. {

  485.     int err;

  486.     DrawTextContext *s = ctx->priv;

  487.     Glyph *glyph;

  488. 

  489. #if FF_API_DRAWTEXT_OLD_TIMELINE

  490.     if (s->draw_expr)

  491.         av_log(ctx, AV_LOG_WARNING, "'draw' option is deprecated and will be removed soon, "

  492.                "you are encouraged to use the generic timeline support through the 'enable' option\n");

  493. #endif

  494. 

  495.     if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {

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

  497.         return AVERROR(EINVAL);

  498.     }

  499. 

  500.     if (s->textfile) {

  501.         if (s->text) {

  502.             av_log(ctx, AV_LOG_ERROR,

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

  504.             return AVERROR(EINVAL);

  505.         }

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

  507.             return err;

  508.     }

  509. 

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

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

  512. 

  513.     if (s->tc_opt_string) {

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

  515.                                                s->tc_opt_string, ctx);

  516.         if (ret < 0)

  517.             return ret;

  518.         if (s->tc24hmax)

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

  520.         if (!s->text)

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

  522.     }

  523. 

  524.     if (!s->text) {

  525.         av_log(ctx, AV_LOG_ERROR,

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

  527.         return AVERROR(EINVAL);

  528.     }

  529. 

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

  531.         av_log(ctx, AV_LOG_ERROR,

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

  533.         return AVERROR(EINVAL);

  534.     }

  535. 

  536.     err = load_font(ctx);

  537.     if (err)

  538.         return err;

  539.     if (!s->fontsize)

  540.         s->fontsize = 16;

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

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

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

  544.         return AVERROR(EINVAL);

  545.     }

  546. 

  547.     if (s->borderw) {

  548.         if (FT_Stroker_New(s->library, &s->stroker)) {

  549.             av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");

  550.             return AVERROR_EXTERNAL;

  551.         }

  552.         FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,

  553.                        FT_STROKER_LINEJOIN_ROUND, 0);

  554.     }

  555. 

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

  557. 

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

  559.     load_glyph(ctx, NULL, 0);

  560. 

  561.     /* set the tabsize in pixels */

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

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

  564.         return err;

  565.     }

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

  567. 

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

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

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

  571. 

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

  573. 

  574.     return 0;

  575. }

  576. 

  577. static int query_formats(AVFilterContext *ctx)

  578. {

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

  580.     return 0;

  581. }

  582. 

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

  584. {

  585.     Glyph *glyph = elem;

  586. 

  587.     FT_Done_Glyph(glyph->glyph);

  588.     FT_Done_Glyph(glyph->border_glyph);

  589.     av_free(elem);

  590.     return 0;

  591. }

  592. 

  593. static av_cold void uninit(AVFilterContext *ctx)

  594. {

  595.     DrawTextContext *s = ctx->priv;

  596. 

  597.     av_expr_free(s->x_pexpr);

  598.     av_expr_free(s->y_pexpr);

  599. #if FF_API_DRAWTEXT_OLD_TIMELINE

  600.     av_expr_free(s->draw_pexpr);

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

  602. #endif

  603.     av_freep(&s->positions);

  604.     s->nb_positions = 0;

  605. 

  606. 

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

  608.     av_tree_destroy(s->glyphs);

  609.     s->glyphs = NULL;

  610. 

  611.     FT_Done_Face(s->face);

  612.     FT_Stroker_Done(s->stroker);

  613.     FT_Done_FreeType(s->library);

  614. 

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

  616. }

  617. 

  618. static inline int is_newline(uint32_t c)

  619. {

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

  621. }

  622. 

  623. static int config_input(AVFilterLink *inlink)

  624. {

  625.     AVFilterContext *ctx = inlink->dst;

  626.     DrawTextContext *s = ctx->priv;

  627.     int ret;

  628. 

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

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

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

  632.     ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);

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

  634. 

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

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

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

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

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

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

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

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

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

  644. 

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

  646. 

  647.     av_expr_free(s->x_pexpr);

  648.     av_expr_free(s->y_pexpr);

  649. #if FF_API_DRAWTEXT_OLD_TIMELINE

  650.     av_expr_free(s->draw_pexpr);

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

  652. #else

  653.     s->x_pexpr = s->y_pexpr = NULL;

  654. #endif

  655. 

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

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

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

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

  660. 

  661.         return AVERROR(EINVAL);

  662. #if FF_API_DRAWTEXT_OLD_TIMELINE

  663.     if (s->draw_expr &&

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

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

  666.         return ret;

  667. #endif

  668. 

  669.     return 0;

  670. }

  671. 

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

  673. {

  674.     DrawTextContext *s = ctx->priv;

  675. 

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

  677.         int ret;

  678.         uninit(ctx);

  679.         s->reinit = 1;

  680.         if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)

  681.             return ret;

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

  683.             return ret;

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

  685.     }

  686. 

  687.     return AVERROR(ENOSYS);

  688. }

  689. 

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

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

  692. {

  693.     DrawTextContext *s = ctx->priv;

  694. 

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

  696.     return 0;

  697. }

  698. 

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

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

  701. {

  702.     DrawTextContext *s = ctx->priv;

  703.     const char *fmt;

  704.     double pts = s->var_values[VAR_T];

  705.     int ret;

  706. 

  707.     fmt = argc >= 1 ? argv[0] : "flt";

  708.     if (argc >= 2) {

  709.         int64_t delta;

  710.         if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {

  711.             av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);

  712.             return ret;

  713.         }

  714.         pts += (double)delta / AV_TIME_BASE;

  715.     }

  716.     if (!strcmp(fmt, "flt")) {

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

  718.     } else if (!strcmp(fmt, "hms")) {

  719.         if (isnan(pts)) {

  720.             av_bprintf(bp, " ??:??:??.???");

  721.         } else {

  722.             int64_t ms = round(pts * 1000);

  723.             char sign = ' ';

  724.             if (ms < 0) {

  725.                 sign = '-';

  726.                 ms = -ms;

  727.             }

  728.             av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,

  729.                        (int)(ms / (60 * 60 * 1000)),

  730.                        (int)(ms / (60 * 1000)) % 60,

  731.                        (int)(ms / 1000) % 60,

  732.                        (int)ms % 1000);

  733.         }

  734.     } else {

  735.         av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);

  736.         return AVERROR(EINVAL);

  737.     }

  738.     return 0;

  739. }

  740. 

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

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

  743. {

  744.     DrawTextContext *s = ctx->priv;

  745. 

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

  747.     return 0;

  748. }

  749. 

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

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

  752. {

  753.     DrawTextContext *s = ctx->priv;

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

  755. 

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

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

  758.     return 0;

  759. }

  760. 

  761. #if !HAVE_LOCALTIME_R

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

  763. {

  764.     *tm = *localtime(t);

  765. }

  766. #endif

  767. 

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

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

  770. {

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

  772.     time_t now;

  773.     struct tm tm;

  774. 

  775.     time(&now);

  776.     if (tag == 'L')

  777.         localtime_r(&now, &tm);

  778.     else

  779.         tm = *gmtime(&now);

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

  781.     return 0;

  782. }

  783. 

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

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

  786. {

  787.     DrawTextContext *s = ctx->priv;

  788.     double res;

  789.     int ret;

  790. 

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

  792.                                  NULL, NULL, fun2_names, fun2,

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

  794.     if (ret < 0)

  795.         av_log(ctx, AV_LOG_ERROR,

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

  797.                argv[0]);

  798.     else

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

  800. 

  801.     return ret;

  802. }

  803. 

  804. static const struct drawtext_function {

  805.     const char *name;

  806.     unsigned argc_min, argc_max;

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

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

  809. } functions[] = {

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

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

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

  813.     { "pts",       0, 2, 0,   func_pts      },

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

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

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

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

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

  819. };

  820. 

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

  822.                          unsigned argc, char **argv)

  823. {

  824.     unsigned i;

  825. 

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

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

  828.             continue;

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

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

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

  832.             return AVERROR(EINVAL);

  833.         }

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

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

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

  837.             return AVERROR(EINVAL);

  838.         }

  839.         break;

  840.     }

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

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

  843.         return AVERROR(EINVAL);

  844.     }

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

  846. }

  847. 

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

  849. {

  850.     const char *text = *rtext;

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

  852.     unsigned argc = 0, i;

  853.     int ret;

  854. 

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

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

  857.         return AVERROR(EINVAL);

  858.     }

  859.     text++;

  860.     while (1) {

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

  862.             ret = AVERROR(ENOMEM);

  863.             goto end;

  864.         }

  865.         if (!*text) {

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

  867.             ret = AVERROR(EINVAL);

  868.             goto end;

  869.         }

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

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

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

  873.             break;

  874.         text++;

  875.     }

  876. 

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

  878.         goto end;

  879.     ret = 0;

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

  881. 

  882. end:

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

  884.         av_freep(&argv[i]);

  885.     return ret;

  886. }

  887. 

  888. static int expand_text(AVFilterContext *ctx)

  889. {

  890.     DrawTextContext *s = ctx->priv;

  891.     char *text = s->text;

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

  893.     int ret;

  894. 

  895.     av_bprint_clear(bp);

  896.     while (*text) {

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

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

  899.             text += 2;

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

  901.             text++;

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

  903.                 return ret;

  904.         } else {

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

  906.             text++;

  907.         }

  908.     }

  909.     if (!av_bprint_is_complete(bp))

  910.         return AVERROR(ENOMEM);

  911.     return 0;

  912. }

  913. 

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

  915.                        int width, int height,

  916.                        FFDrawColor *color, int x, int y, int borderw)

  917. {

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

  919.     uint32_t code = 0;

  920.     int i, x1, y1;

  921.     uint8_t *p;

  922.     Glyph *glyph = NULL;

  923. 

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

  925.         FT_Bitmap bitmap;

  926.         Glyph dummy = { 0 };

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

  928. 

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

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

  931.             continue;

  932. 

  933.         dummy.code = code;

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

  935. 

  936.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  937. 

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

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

  940.             return AVERROR(EINVAL);

  941. 

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

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

  944. 

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

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

  947.                       bitmap.buffer, bitmap.pitch,

  948.                       bitmap.width, bitmap.rows,

  949.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  950.                       0, x1, y1);

  951.     }

  952. 

  953.     return 0;

  954. }

  955. 

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

  957.                      int width, int height)

  958. {

  959.     DrawTextContext *s = ctx->priv;

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

  961. 

  962.     uint32_t code = 0, prev_code = 0;

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

  964.     int max_text_line_w = 0, len;

  965.     int box_w, box_h;

  966.     char *text;

  967.     uint8_t *p;

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

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

  970.     FT_Vector delta;

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

  972.     Glyph dummy = { 0 };

  973. 

  974.     time_t now = time(0);

  975.     struct tm ltime;

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

  977. 

  978.     av_bprint_clear(bp);

  979. 

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

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

  982. 

  983.     switch (s->exp_mode) {

  984.     case EXP_NONE:

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

  986.         break;

  987.     case EXP_NORMAL:

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

  989.             return ret;

  990.         break;

  991.     case EXP_STRFTIME:

  992.         localtime_r(&now, &ltime);

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

  994.         break;

  995.     }

  996. 

  997.     if (s->tc_opt_string) {

  998.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

  1000.         av_bprint_clear(bp);

  1001.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1002.     }

  1003. 

  1004.     if (!av_bprint_is_complete(bp))

  1005.         return AVERROR(ENOMEM);

  1006.     text = s->expanded_text.str;

  1007.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1008.         if (!(s->positions =

  1009.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1010.             return AVERROR(ENOMEM);

  1011.         s->nb_positions = len;

  1012.     }

  1013. 

  1014.     x = 0;

  1015.     y = 0;

  1016. 

  1017.     /* load and cache glyphs */

  1018.     for (i = 0, p = text; *p; i++) {

  1019.         GET_UTF8(code, *p++, continue;);

  1020. 

  1021.         /* get glyph */

  1022.         dummy.code = code;

  1023.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1024.         if (!glyph) {

  1025.             load_glyph(ctx, &glyph, code);

  1026.         }

  1027. 

  1028.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1029.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1030.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1031.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1032.     }

  1033.     s->max_glyph_h = y_max - y_min;

  1034.     s->max_glyph_w = x_max - x_min;

  1035. 

  1036.     /* compute and save position for each glyph */

  1037.     glyph = NULL;

  1038.     for (i = 0, p = text; *p; i++) {

  1039.         GET_UTF8(code, *p++, continue;);

  1040. 

  1041.         /* skip the \n in the sequence \r\n */

  1042.         if (prev_code == '\r' && code == '\n')

  1043.             continue;

  1044. 

  1045.         prev_code = code;

  1046.         if (is_newline(code)) {

  1047. 

  1048.             max_text_line_w = FFMAX(max_text_line_w, x);

  1049.             y += s->max_glyph_h;

  1050.             x = 0;

  1051.             continue;

  1052.         }

  1053. 

  1054.         /* get glyph */

  1055.         prev_glyph = glyph;

  1056.         dummy.code = code;

  1057.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1058. 

  1059.         /* kerning */

  1060.         if (s->use_kerning && prev_glyph && glyph->code) {

  1061.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1062.                            ft_kerning_default, &delta);

  1063.             x += delta.x >> 6;

  1064.         }

  1065. 

  1066.         /* save position */

  1067.         s->positions[i].x = x + glyph->bitmap_left;

  1068.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1069.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1070.         else              x += glyph->advance;

  1071.     }

  1072. 

  1073.     max_text_line_w = FFMAX(x, max_text_line_w);

  1074. 

  1075.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1076.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1077. 

  1078.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1079.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1080.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1081.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1082. 

  1083.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1084. 

  1085.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1086.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1087.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1088. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1089.     if (s->draw_pexpr){

  1090.     s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);

  1091. 

  1092.     if(!s->draw)

  1093.         return 0;

  1094.     }

  1095.     if (ctx->is_disabled)

  1096.         return 0;

  1097. #endif

  1098. 

  1099.     box_w = FFMIN(width - 1 , max_text_line_w);

  1100.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1101. 

  1102.     /* draw box */

  1103.     if (s->draw_box)

  1104.         ff_blend_rectangle(&s->dc, &s->boxcolor,

  1105.                            frame->data, frame->linesize, width, height,

  1106.                            s->x, s->y, box_w, box_h);

  1107. 

  1108.     if (s->shadowx || s->shadowy) {

  1109.         if ((ret = draw_glyphs(s, frame, width, height,

  1110.                                &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1111.             return ret;

  1112.     }

  1113. 

  1114.     if (s->borderw) {

  1115.         if ((ret = draw_glyphs(s, frame, width, height,

  1116.                                &s->bordercolor, 0, 0, s->borderw)) < 0)

  1117.             return ret;

  1118.     }

  1119.     if ((ret = draw_glyphs(s, frame, width, height,

  1120.                            &s->fontcolor, 0, 0, 0)) < 0)

  1121.         return ret;

  1122. 

  1123.     return 0;

  1124. }

  1125. 

  1126. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1127. {

  1128.     AVFilterContext *ctx = inlink->dst;

  1129.     AVFilterLink *outlink = ctx->outputs[0];

  1130.     DrawTextContext *s = ctx->priv;

  1131.     int ret;

  1132. 

  1133.     if (s->reload)

  1134.         if ((ret = load_textfile(ctx)) < 0)

  1135.             return ret;

  1136. 

  1137.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;

  1138.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1139.         NAN : frame->pts * av_q2d(inlink->time_base);

  1140. 

  1141.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1142.     s->metadata = av_frame_get_metadata(frame);

  1143. 

  1144.     draw_text(ctx, frame, frame->width, frame->height);

  1145. 

  1146.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1147.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1148.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1149.            s->x, s->y);

  1150. 

  1151.     return ff_filter_frame(outlink, frame);

  1152. }

  1153. 

  1154. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1155.     {

  1156.         .name           = "default",

  1157.         .type           = AVMEDIA_TYPE_VIDEO,

  1158.         .filter_frame   = filter_frame,

  1159.         .config_props   = config_input,

  1160.         .needs_writable = 1,

  1161.     },

  1162.     { NULL }

  1163. };

  1164. 

  1165. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1166.     {

  1167.         .name = "default",

  1168.         .type = AVMEDIA_TYPE_VIDEO,

  1169.     },

  1170.     { NULL }

  1171. };

  1172. 

  1173. AVFilter ff_vf_drawtext = {

  1174.     .name          = "drawtext",

  1175.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1176.     .priv_size     = sizeof(DrawTextContext),

  1177.     .priv_class    = &drawtext_class,

  1178.     .init          = init,

  1179.     .uninit        = uninit,

  1180.     .query_formats = query_formats,

  1181.     .inputs        = avfilter_vf_drawtext_inputs,

  1182.     .outputs       = avfilter_vf_drawtext_outputs,

  1183.     .process_command = command,

  1184. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1185.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

  1186. #else

  1187.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1188. #endif

  1189. };