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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.     uint32_t code;

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

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

  268.     FT_BBox bbox;

  269.     int advance;

  270.     int bitmap_left;

  271.     int bitmap_top;

  272. } Glyph;

  273. 

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

  275. {

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

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

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

  279. }

  280. 

  281. /**

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

  283.  */

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

  285. {

  286.     DrawTextContext *s = ctx->priv;

  287.     FT_BitmapGlyph bitmapglyph;

  288.     Glyph *glyph;

  289.     struct AVTreeNode *node = NULL;

  290.     int ret;

  291. 

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

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

  294.         return AVERROR(EINVAL);

  295. 

  296.     /* save glyph */

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

  298.         !(glyph->glyph = av_mallocz(sizeof(*glyph->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.         FT_Glyph border_glyph = *glyph->glyph;

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

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

  312.             ret = AVERROR_EXTERNAL;

  313.             goto error;

  314.         }

  315.         bitmapglyph = (FT_BitmapGlyph) 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.     av_freep(&glyph);

  347.     av_freep(&node);

  348.     return ret;

  349. }

  350. 

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

  352. {

  353.     DrawTextContext *s = ctx->priv;

  354.     int err;

  355. 

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

  357.     if (err) {

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

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

  360.         return AVERROR(EINVAL);

  361.     }

  362.     return 0;

  363. }

  364. 

  365. #if CONFIG_LIBFONTCONFIG

  366. static int load_font_fontconfig(AVFilterContext *ctx)

  367. {

  368.     DrawTextContext *s = ctx->priv;

  369.     FcConfig *fontconfig;

  370.     FcPattern *pat, *best;

  371.     FcResult result = FcResultMatch;

  372.     FcChar8 *filename;

  373.     int index;

  374.     double size;

  375.     int err = AVERROR(ENOENT);

  376. 

  377.     fontconfig = FcInitLoadConfigAndFonts();

  378.     if (!fontconfig) {

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

  380.         return AVERROR_UNKNOWN;

  381.     }

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

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

  384.     if (!pat) {

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

  386.         return AVERROR(EINVAL);

  387.     }

  388. 

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

  390.     if (s->fontsize)

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

  392. 

  393.     FcDefaultSubstitute(pat);

  394. 

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

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

  397.         FcPatternDestroy(pat);

  398.         return AVERROR(ENOMEM);

  399.     }

  400. 

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

  402.     FcPatternDestroy(pat);

  403. 

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

  405.         av_log(ctx, AV_LOG_ERROR,

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

  407.                s->font);

  408.         goto fail;

  409.     }

  410. 

  411.     if (

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

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

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

  415.         return AVERROR(EINVAL);

  416.     }

  417. 

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

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

  420.                s->font);

  421.         goto fail;

  422.     }

  423. 

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

  425.     if (!s->fontsize)

  426.         s->fontsize = size + 0.5;

  427. 

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

  429.     if (err)

  430.         return err;

  431.     FcConfigDestroy(fontconfig);

  432. fail:

  433.     FcPatternDestroy(best);

  434.     return err;

  435. }

  436. #endif

  437. 

  438. static int load_font(AVFilterContext *ctx)

  439. {

  440.     DrawTextContext *s = ctx->priv;

  441.     int err;

  442. 

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

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

  445.     if (!err)

  446.         return 0;

  447. #if CONFIG_LIBFONTCONFIG

  448.     err = load_font_fontconfig(ctx);

  449.     if (!err)

  450.         return 0;

  451. #endif

  452.     return err;

  453. }

  454. 

  455. static int load_textfile(AVFilterContext *ctx)

  456. {

  457.     DrawTextContext *s = ctx->priv;

  458.     int err;

  459.     uint8_t *textbuf;

  460.     size_t textbuf_size;

  461. 

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

  463.         av_log(ctx, AV_LOG_ERROR,

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

  465.                s->textfile);

  466.         return err;

  467.     }

  468. 

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

  470.         return AVERROR(ENOMEM);

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

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

  473.     av_file_unmap(textbuf, textbuf_size);

  474. 

  475.     return 0;

  476. }

  477. 

  478. static av_cold int init(AVFilterContext *ctx)

  479. {

  480.     int err;

  481.     DrawTextContext *s = ctx->priv;

  482.     Glyph *glyph;

  483. 

  484. #if FF_API_DRAWTEXT_OLD_TIMELINE

  485.     if (s->draw_expr)

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

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

  488. #endif

  489. 

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

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

  492.         return AVERROR(EINVAL);

  493.     }

  494. 

  495.     if (s->textfile) {

  496.         if (s->text) {

  497.             av_log(ctx, AV_LOG_ERROR,

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

  499.             return AVERROR(EINVAL);

  500.         }

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

  502.             return err;

  503.     }

  504. 

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

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

  507. 

  508.     if (s->tc_opt_string) {

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

  510.                                                s->tc_opt_string, ctx);

  511.         if (ret < 0)

  512.             return ret;

  513.         if (s->tc24hmax)

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

  515.         if (!s->text)

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

  517.     }

  518. 

  519.     if (!s->text) {

  520.         av_log(ctx, AV_LOG_ERROR,

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

  522.         return AVERROR(EINVAL);

  523.     }

  524. 

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

  526.         av_log(ctx, AV_LOG_ERROR,

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

  528.         return AVERROR(EINVAL);

  529.     }

  530. 

  531.     err = load_font(ctx);

  532.     if (err)

  533.         return err;

  534.     if (!s->fontsize)

  535.         s->fontsize = 16;

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

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

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

  539.         return AVERROR(EINVAL);

  540.     }

  541. 

  542.     if (s->borderw) {

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

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

  545.             return AVERROR_EXTERNAL;

  546.         }

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

  548.                        FT_STROKER_LINEJOIN_ROUND, 0);

  549.     }

  550. 

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

  552. 

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

  554.     load_glyph(ctx, NULL, 0);

  555. 

  556.     /* set the tabsize in pixels */

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

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

  559.         return err;

  560.     }

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

  562. 

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

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

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

  566. 

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

  568. 

  569.     return 0;

  570. }

  571. 

  572. static int query_formats(AVFilterContext *ctx)

  573. {

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

  575.     return 0;

  576. }

  577. 

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

  579. {

  580.     Glyph *glyph = elem;

  581. 

  582.     FT_Done_Glyph(*glyph->glyph);

  583.     av_freep(&glyph->glyph);

  584.     av_free(elem);

  585.     return 0;

  586. }

  587. 

  588. static av_cold void uninit(AVFilterContext *ctx)

  589. {

  590.     DrawTextContext *s = ctx->priv;

  591. 

  592.     av_expr_free(s->x_pexpr);

  593.     av_expr_free(s->y_pexpr);

  594. #if FF_API_DRAWTEXT_OLD_TIMELINE

  595.     av_expr_free(s->draw_pexpr);

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

  597. #endif

  598.     av_freep(&s->positions);

  599.     s->nb_positions = 0;

  600. 

  601. 

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

  603.     av_tree_destroy(s->glyphs);

  604.     s->glyphs = NULL;

  605. 

  606.     FT_Done_Face(s->face);

  607.     FT_Stroker_Done(s->stroker);

  608.     FT_Done_FreeType(s->library);

  609. 

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

  611. }

  612. 

  613. static inline int is_newline(uint32_t c)

  614. {

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

  616. }

  617. 

  618. static int config_input(AVFilterLink *inlink)

  619. {

  620.     AVFilterContext *ctx = inlink->dst;

  621.     DrawTextContext *s = ctx->priv;

  622.     int ret;

  623. 

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

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

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

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

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

  629. 

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

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

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

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

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

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

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

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

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

  639. 

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

  641. 

  642.     av_expr_free(s->x_pexpr);

  643.     av_expr_free(s->y_pexpr);

  644. #if FF_API_DRAWTEXT_OLD_TIMELINE

  645.     av_expr_free(s->draw_pexpr);

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

  647. #else

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

  649. #endif

  650. 

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

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

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

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

  655. 

  656.         return AVERROR(EINVAL);

  657. #if FF_API_DRAWTEXT_OLD_TIMELINE

  658.     if (s->draw_expr &&

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

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

  661.         return ret;

  662. #endif

  663. 

  664.     return 0;

  665. }

  666. 

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

  668. {

  669.     DrawTextContext *s = ctx->priv;

  670. 

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

  672.         int ret;

  673.         uninit(ctx);

  674.         s->reinit = 1;

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

  676.             return ret;

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

  678.             return ret;

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

  680.     }

  681. 

  682.     return AVERROR(ENOSYS);

  683. }

  684. 

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

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

  687. {

  688.     DrawTextContext *s = ctx->priv;

  689. 

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

  691.     return 0;

  692. }

  693. 

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

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

  696. {

  697.     DrawTextContext *s = ctx->priv;

  698. 

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

  700.     return 0;

  701. }

  702. 

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

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

  705. {

  706.     DrawTextContext *s = ctx->priv;

  707. 

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

  709.     return 0;

  710. }

  711. 

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

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

  714. {

  715.     DrawTextContext *s = ctx->priv;

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

  717. 

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

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

  720.     return 0;

  721. }

  722. 

  723. #if !HAVE_LOCALTIME_R

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

  725. {

  726.     *tm = *localtime(t);

  727. }

  728. #endif

  729. 

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

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

  732. {

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

  734.     time_t now;

  735.     struct tm tm;

  736. 

  737.     time(&now);

  738.     if (tag == 'L')

  739.         localtime_r(&now, &tm);

  740.     else

  741.         tm = *gmtime(&now);

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

  743.     return 0;

  744. }

  745. 

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

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

  748. {

  749.     DrawTextContext *s = ctx->priv;

  750.     double res;

  751.     int ret;

  752. 

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

  754.                                  NULL, NULL, fun2_names, fun2,

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

  756.     if (ret < 0)

  757.         av_log(ctx, AV_LOG_ERROR,

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

  759.                argv[0]);

  760.     else

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

  762. 

  763.     return ret;

  764. }

  765. 

  766. static const struct drawtext_function {

  767.     const char *name;

  768.     unsigned argc_min, argc_max;

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

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

  771. } functions[] = {

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

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

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

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

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

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

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

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

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

  781. };

  782. 

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

  784.                          unsigned argc, char **argv)

  785. {

  786.     unsigned i;

  787. 

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

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

  790.             continue;

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

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

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

  794.             return AVERROR(EINVAL);

  795.         }

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

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

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

  799.             return AVERROR(EINVAL);

  800.         }

  801.         break;

  802.     }

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

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

  805.         return AVERROR(EINVAL);

  806.     }

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

  808. }

  809. 

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

  811. {

  812.     const char *text = *rtext;

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

  814.     unsigned argc = 0, i;

  815.     int ret;

  816. 

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

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

  819.         return AVERROR(EINVAL);

  820.     }

  821.     text++;

  822.     while (1) {

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

  824.             ret = AVERROR(ENOMEM);

  825.             goto end;

  826.         }

  827.         if (!*text) {

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

  829.             ret = AVERROR(EINVAL);

  830.             goto end;

  831.         }

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

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

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

  835.             break;

  836.         text++;

  837.     }

  838. 

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

  840.         goto end;

  841.     ret = 0;

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

  843. 

  844. end:

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

  846.         av_freep(&argv[i]);

  847.     return ret;

  848. }

  849. 

  850. static int expand_text(AVFilterContext *ctx)

  851. {

  852.     DrawTextContext *s = ctx->priv;

  853.     char *text = s->text;

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

  855.     int ret;

  856. 

  857.     av_bprint_clear(bp);

  858.     while (*text) {

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

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

  861.             text += 2;

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

  863.             text++;

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

  865.                 return ret;

  866.         } else {

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

  868.             text++;

  869.         }

  870.     }

  871.     if (!av_bprint_is_complete(bp))

  872.         return AVERROR(ENOMEM);

  873.     return 0;

  874. }

  875. 

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

  877.                        int width, int height, const uint8_t rgbcolor[4],

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

  879. {

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

  881.     uint32_t code = 0;

  882.     int i, x1, y1;

  883.     uint8_t *p;

  884.     Glyph *glyph = NULL;

  885. 

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

  887.         FT_Bitmap bitmap;

  888.         Glyph dummy = { 0 };

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

  890. 

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

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

  893.             continue;

  894. 

  895.         dummy.code = code;

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

  897. 

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

  899. 

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

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

  902.             return AVERROR(EINVAL);

  903. 

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

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

  906. 

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

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

  909.                       bitmap.buffer, bitmap.pitch,

  910.                       bitmap.width, bitmap.rows,

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

  912.                       0, x1, y1);

  913.     }

  914. 

  915.     return 0;

  916. }

  917. 

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

  919.                      int width, int height)

  920. {

  921.     DrawTextContext *s = ctx->priv;

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

  923. 

  924.     uint32_t code = 0, prev_code = 0;

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

  926.     int max_text_line_w = 0, len;

  927.     int box_w, box_h;

  928.     char *text;

  929.     uint8_t *p;

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

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

  932.     FT_Vector delta;

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

  934.     Glyph dummy = { 0 };

  935. 

  936.     time_t now = time(0);

  937.     struct tm ltime;

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

  939. 

  940.     av_bprint_clear(bp);

  941. 

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

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

  944. 

  945.     switch (s->exp_mode) {

  946.     case EXP_NONE:

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

  948.         break;

  949.     case EXP_NORMAL:

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

  951.             return ret;

  952.         break;

  953.     case EXP_STRFTIME:

  954.         localtime_r(&now, &ltime);

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

  956.         break;

  957.     }

  958. 

  959.     if (s->tc_opt_string) {

  960.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

  962.         av_bprint_clear(bp);

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

  964.     }

  965. 

  966.     if (!av_bprint_is_complete(bp))

  967.         return AVERROR(ENOMEM);

  968.     text = s->expanded_text.str;

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

  970.         if (!(s->positions =

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

  972.             return AVERROR(ENOMEM);

  973.         s->nb_positions = len;

  974.     }

  975. 

  976.     x = 0;

  977.     y = 0;

  978. 

  979.     /* load and cache glyphs */

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

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

  982. 

  983.         /* get glyph */

  984.         dummy.code = code;

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

  986.         if (!glyph) {

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

  988.         }

  989. 

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

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

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

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

  994.     }

  995.     s->max_glyph_h = y_max - y_min;

  996.     s->max_glyph_w = x_max - x_min;

  997. 

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

  999.     glyph = NULL;

  1000.     for (i = 0, p = text; *p; i++) {

  1001.         GET_UTF8(code, *p++, continue;);

  1002. 

  1003.         /* skip the \n in the sequence \r\n */

  1004.         if (prev_code == '\r' && code == '\n')

  1005.             continue;

  1006. 

  1007.         prev_code = code;

  1008.         if (is_newline(code)) {

  1009. 

  1010.             max_text_line_w = FFMAX(max_text_line_w, x);

  1011.             y += s->max_glyph_h;

  1012.             x = 0;

  1013.             continue;

  1014.         }

  1015. 

  1016.         /* get glyph */

  1017.         prev_glyph = glyph;

  1018.         dummy.code = code;

  1019.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1020. 

  1021.         /* kerning */

  1022.         if (s->use_kerning && prev_glyph && glyph->code) {

  1023.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1024.                            ft_kerning_default, &delta);

  1025.             x += delta.x >> 6;

  1026.         }

  1027. 

  1028.         /* save position */

  1029.         s->positions[i].x = x + glyph->bitmap_left;

  1030.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1031.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1032.         else              x += glyph->advance;

  1033.     }

  1034. 

  1035.     max_text_line_w = FFMAX(x, max_text_line_w);

  1036. 

  1037.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1038.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1039. 

  1040.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1041.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1042.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1043.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1044. 

  1045.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1046. 

  1047.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1048.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1049.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1050. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1051.     if (s->draw_pexpr){

  1052.     s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);

  1053. 

  1054.     if(!s->draw)

  1055.         return 0;

  1056.     }

  1057.     if (ctx->is_disabled)

  1058.         return 0;

  1059. #endif

  1060. 

  1061.     box_w = FFMIN(width - 1 , max_text_line_w);

  1062.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1063. 

  1064.     /* draw box */

  1065.     if (s->draw_box)

  1066.         ff_blend_rectangle(&s->dc, &s->boxcolor,

  1067.                            frame->data, frame->linesize, width, height,

  1068.                            s->x, s->y, box_w, box_h);

  1069. 

  1070.     if (s->shadowx || s->shadowy) {

  1071.         if ((ret = draw_glyphs(s, frame, width, height, s->shadowcolor.rgba,

  1072.                                &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1073.             return ret;

  1074.     }

  1075. 

  1076.     if (s->borderw) {

  1077.         if ((ret = draw_glyphs(s, frame, width, height, s->bordercolor.rgba,

  1078.                                &s->bordercolor, 0, 0, s->borderw)) < 0)

  1079.             return ret;

  1080.     }

  1081.     if ((ret = draw_glyphs(s, frame, width, height, s->fontcolor.rgba,

  1082.                            &s->fontcolor, 0, 0, 0)) < 0)

  1083.         return ret;

  1084. 

  1085.     return 0;

  1086. }

  1087. 

  1088. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1089. {

  1090.     AVFilterContext *ctx = inlink->dst;

  1091.     AVFilterLink *outlink = ctx->outputs[0];

  1092.     DrawTextContext *s = ctx->priv;

  1093.     int ret;

  1094. 

  1095.     if (s->reload)

  1096.         if ((ret = load_textfile(ctx)) < 0)

  1097.             return ret;

  1098. 

  1099.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;

  1100.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1101.         NAN : frame->pts * av_q2d(inlink->time_base);

  1102. 

  1103.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1104.     s->metadata = av_frame_get_metadata(frame);

  1105. 

  1106.     draw_text(ctx, frame, frame->width, frame->height);

  1107. 

  1108.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1109.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1110.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1111.            s->x, s->y);

  1112. 

  1113.     return ff_filter_frame(outlink, frame);

  1114. }

  1115. 

  1116. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1117.     {

  1118.         .name           = "default",

  1119.         .type           = AVMEDIA_TYPE_VIDEO,

  1120.         .filter_frame   = filter_frame,

  1121.         .config_props   = config_input,

  1122.         .needs_writable = 1,

  1123.     },

  1124.     { NULL }

  1125. };

  1126. 

  1127. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1128.     {

  1129.         .name = "default",

  1130.         .type = AVMEDIA_TYPE_VIDEO,

  1131.     },

  1132.     { NULL }

  1133. };

  1134. 

  1135. AVFilter ff_vf_drawtext = {

  1136.     .name          = "drawtext",

  1137.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1138.     .priv_size     = sizeof(DrawTextContext),

  1139.     .priv_class    = &drawtext_class,

  1140.     .init          = init,

  1141.     .uninit        = uninit,

  1142.     .query_formats = query_formats,

  1143.     .inputs        = avfilter_vf_drawtext_inputs,

  1144.     .outputs       = avfilter_vf_drawtext_outputs,

  1145.     .process_command = command,

  1146. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1147.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

  1148. #else

  1149.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1150. #endif

  1151. };