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FFmpeg/libavfilter/vf_drawtext.c

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  1. /*

  2.  * Copyright (c) 2011 Stefano Sabatini

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

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

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

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

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include <sys/time.h>

  30. #include <time.h>

  31. 

  32. #include "config.h"

  33. #include "libavutil/avstring.h"

  34. #include "libavutil/file.h"

  35. #include "libavutil/eval.h"

  36. #include "libavutil/opt.h"

  37. #include "libavutil/random_seed.h"

  38. #include "libavutil/parseutils.h"

  39. #include "libavutil/timecode.h"

  40. #include "libavutil/tree.h"

  41. #include "libavutil/lfg.h"

  42. #include "avfilter.h"

  43. #include "drawutils.h"

  44. #include "formats.h"

  45. #include "video.h"

  46. 

  47. #undef time

  48. 

  49. #include <ft2build.h>

  50. #include <freetype/config/ftheader.h>

  51. #include FT_FREETYPE_H

  52. #include FT_GLYPH_H

  53. #if CONFIG_FONTCONFIG

  54. #include <fontconfig/fontconfig.h>

  55. #endif

  56. 

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

  58.     "dar",

  59.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  68.     "sar",

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

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

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

  72.     "x",

  73.     "y",

  74.     NULL

  75. };

  76. 

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

  78.     "rand"

  79. };

  80. 

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

  82. {

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

  84. }

  85. 

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

  87. 

  88. static const eval_func2 fun2[] = {

  89.     drand,

  90.     NULL

  91. };

  92. 

  93. enum var_name {

  94.     VAR_DAR,

  95.     VAR_HSUB, VAR_VSUB,

  96.     VAR_LINE_H, VAR_LH,

  97.     VAR_MAIN_H, VAR_h, VAR_H,

  98.     VAR_MAIN_W, VAR_w, VAR_W,

  99.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  100.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  101.     VAR_MAX_GLYPH_H,

  102.     VAR_MAX_GLYPH_W,

  103.     VAR_N,

  104.     VAR_SAR,

  105.     VAR_T,

  106.     VAR_TEXT_H, VAR_TH,

  107.     VAR_TEXT_W, VAR_TW,

  108.     VAR_X,

  109.     VAR_Y,

  110.     VAR_VARS_NB

  111. };

  112. 

  113. typedef struct {

  114.     const AVClass *class;

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

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

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

  118.     uint8_t *expanded_text;         ///< used to contain the strftime()-expanded text

  119.     size_t   expanded_text_size;    ///< size in bytes of the expanded_text buffer

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

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

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

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

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

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

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

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

  128.     int shadowx, shadowy;

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

  130.     char *fontcolor_string;         ///< font color as string

  131.     char *boxcolor_string;          ///< box color as string

  132.     char *shadowcolor_string;       ///< shadow color as string

  133. 

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

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

  136.     int tabsize;                    ///< tab size

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

  138. 

  139.     FFDrawContext dc;

  140.     FFDrawColor fontcolor;          ///< foreground color

  141.     FFDrawColor shadowcolor;        ///< shadow color

  142.     FFDrawColor boxcolor;           ///< background color

  143. 

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

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

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

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

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

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

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

  151.     double var_values[VAR_VARS_NB];

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

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

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

  155.     AVLFG  prng;                    ///< random

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

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

  158.     AVTimecode  tc;                 ///< timecode context

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

  160.     int frame_id;

  161. } DrawTextContext;

  162. 

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

  164. 

  165. static const AVOption drawtext_options[]= {

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

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

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

  169. {"fontcolor",   "set foreground color", OFFSET(fontcolor_string),   AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  170. {"boxcolor",    "set box color",        OFFSET(boxcolor_string),    AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },

  171. {"shadowcolor", "set shadow color",     OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  172. {"box",      "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.dbl=0},     0,        1        },

  173. {"fontsize", "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.dbl=0},     0,        INT_MAX  },

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

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

  176. {"shadowx",  "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  177. {"shadowy",  "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  178. {"tabsize",  "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.dbl=4},     0,        INT_MAX  },

  179. {"basetime", "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.dbl=AV_NOPTS_VALUE},     INT64_MIN,        INT64_MAX  },

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

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

  182. {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT,  {.dbl=0},            0,        1 },

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

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

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

  186. {"fix_bounds", "if true, check and fix text coords to avoid clipping",

  187.                                      OFFSET(fix_bounds),         AV_OPT_TYPE_INT,    {.dbl=1},     0,        1        },

  188. 

  189. /* FT_LOAD_* flags */

  190. {"ft_load_flags", "set font loading flags for libfreetype",   OFFSET(ft_load_flags),  AV_OPT_TYPE_FLAGS,  {.dbl=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, 0, "ft_load_flags" },

  191. {"default",                     "set default",                     0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  192. {"no_scale",                    "set no_scale",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  193. {"no_hinting",                  "set no_hinting",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  194. {"render",                      "set render",                      0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  195. {"no_bitmap",                   "set no_bitmap",                   0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  196. {"vertical_layout",             "set vertical_layout",             0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  197. {"force_autohint",              "set force_autohint",              0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  198. {"crop_bitmap",                 "set crop_bitmap",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  199. {"pedantic",                    "set pedantic",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  200. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  201. {"no_recurse",                  "set no_recurse",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  202. {"ignore_transform",            "set ignore_transform",            0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  203. {"monochrome",                  "set monochrome",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  204. {"linear_design",               "set linear_design",               0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  205. {"no_autohint",                 "set no_autohint",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  206. {NULL},

  207. };

  208. 

  209. static const AVClass drawtext_class = {

  210.     "DrawTextContext",

  211.     av_default_item_name,

  212.     drawtext_options

  213. };

  214. 

  215. #undef __FTERRORS_H__

  216. #define FT_ERROR_START_LIST {

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

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

  219. 

  220. struct ft_error

  221. {

  222.     int err;

  223.     const char *err_msg;

  224. } static ft_errors[] =

  225. #include FT_ERRORS_H

  226. 

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

  228. 

  229. typedef struct {

  230.     FT_Glyph *glyph;

  231.     uint32_t code;

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

  233.     FT_BBox bbox;

  234.     int advance;

  235.     int bitmap_left;

  236.     int bitmap_top;

  237. } Glyph;

  238. 

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

  240. {

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

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

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

  244. }

  245. 

  246. /**

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

  248.  */

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

  250. {

  251.     DrawTextContext *dtext = ctx->priv;

  252.     Glyph *glyph;

  253.     struct AVTreeNode *node = NULL;

  254.     int ret;

  255. 

  256.     /* load glyph into dtext->face->glyph */

  257.     if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))

  258.         return AVERROR(EINVAL);

  259. 

  260.     /* save glyph */

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

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

  263.         ret = AVERROR(ENOMEM);

  264.         goto error;

  265.     }

  266.     glyph->code  = code;

  267. 

  268.     if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {

  269.         ret = AVERROR(EINVAL);

  270.         goto error;

  271.     }

  272. 

  273.     glyph->bitmap      = dtext->face->glyph->bitmap;

  274.     glyph->bitmap_left = dtext->face->glyph->bitmap_left;

  275.     glyph->bitmap_top  = dtext->face->glyph->bitmap_top;

  276.     glyph->advance     = dtext->face->glyph->advance.x >> 6;

  277. 

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

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

  280. 

  281.     /* cache the newly created glyph */

  282.     if (!(node = av_mallocz(av_tree_node_size))) {

  283.         ret = AVERROR(ENOMEM);

  284.         goto error;

  285.     }

  286.     av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);

  287. 

  288.     if (glyph_ptr)

  289.         *glyph_ptr = glyph;

  290.     return 0;

  291. 

  292. error:

  293.     if (glyph)

  294.         av_freep(&glyph->glyph);

  295.     av_freep(&glyph);

  296.     av_freep(&node);

  297.     return ret;

  298. }

  299. 

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

  301.                           const char **error)

  302. {

  303.     DrawTextContext *dtext = ctx->priv;

  304.     int err;

  305. 

  306.     err = FT_New_Face(dtext->library, path, index, &dtext->face);

  307.     if (err) {

  308.         *error = FT_ERRMSG(err);

  309.         return AVERROR(EINVAL);

  310.     }

  311.     return 0;

  312. }

  313. 

  314. #if CONFIG_FONTCONFIG

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

  316. {

  317.     DrawTextContext *dtext = ctx->priv;

  318.     FcConfig *fontconfig;

  319.     FcPattern *pattern, *fpat;

  320.     FcResult result = FcResultMatch;

  321.     FcChar8 *filename;

  322.     int err, index;

  323.     double size;

  324. 

  325.     fontconfig = FcInitLoadConfigAndFonts();

  326.     if (!fontconfig) {

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

  328.         return AVERROR(EINVAL);

  329.     }

  330.     pattern = FcNameParse(dtext->fontfile ? dtext->fontfile :

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

  332.     if (!pattern) {

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

  334.         return AVERROR(EINVAL);

  335.     }

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

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

  338.         return AVERROR(EINVAL);

  339.     }

  340.     FcDefaultSubstitute(pattern);

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

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

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

  344.         return AVERROR(EINVAL);

  345.     }

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

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

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

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

  350.         return AVERROR(EINVAL);

  351.     }

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

  353.     if (!dtext->fontsize)

  354.         dtext->fontsize = size + 0.5;

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

  356.     if (err)

  357.         return err;

  358.     FcPatternDestroy(fpat);

  359.     FcPatternDestroy(pattern);

  360.     FcConfigDestroy(fontconfig);

  361.     return 0;

  362. }

  363. #endif

  364. 

  365. static int load_font(AVFilterContext *ctx)

  366. {

  367.     DrawTextContext *dtext = ctx->priv;

  368.     int err;

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

  370. 

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

  372.     err = load_font_file(ctx, dtext->fontfile, 0, &error);

  373.     if (!err)

  374.         return 0;

  375. #if CONFIG_FONTCONFIG

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

  377.     if (!err)

  378.         return 0;

  379. #endif

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

  381.            dtext->fontfile, error);

  382.     return err;

  383. }

  384. 

  385. static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)

  386. {

  387.     int err;

  388.     DrawTextContext *dtext = ctx->priv;

  389.     Glyph *glyph;

  390. 

  391.     dtext->class = &drawtext_class;

  392.     av_opt_set_defaults(dtext);

  393. 

  394.     if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {

  395.         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);

  396.         return err;

  397.     }

  398. 

  399.     if (!dtext->fontfile && !CONFIG_FONTCONFIG) {

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

  401.         return AVERROR(EINVAL);

  402.     }

  403. 

  404.     if (dtext->textfile) {

  405.         uint8_t *textbuf;

  406.         size_t textbuf_size;

  407. 

  408.         if (dtext->text) {

  409.             av_log(ctx, AV_LOG_ERROR,

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

  411.             return AVERROR(EINVAL);

  412.         }

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

  414.             av_log(ctx, AV_LOG_ERROR,

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

  416.                    dtext->textfile);

  417.             return err;

  418.         }

  419. 

  420.         if (!(dtext->text = av_malloc(textbuf_size+1)))

  421.             return AVERROR(ENOMEM);

  422.         memcpy(dtext->text, textbuf, textbuf_size);

  423.         dtext->text[textbuf_size] = 0;

  424.         av_file_unmap(textbuf, textbuf_size);

  425.     }

  426. 

  427.     if (dtext->tc_opt_string) {

  428.         int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,

  429.                                                dtext->tc_opt_string, ctx);

  430.         if (ret < 0)

  431.             return ret;

  432.         if (dtext->tc24hmax)

  433.             dtext->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;

  434.         if (!dtext->text)

  435.             dtext->text = av_strdup("");

  436.     }

  437. 

  438.     if (!dtext->text) {

  439.         av_log(ctx, AV_LOG_ERROR,

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

  441.         return AVERROR(EINVAL);

  442.     }

  443. 

  444.     if ((err = av_parse_color(dtext->fontcolor.rgba, dtext->fontcolor_string, -1, ctx))) {

  445.         av_log(ctx, AV_LOG_ERROR,

  446.                "Invalid font color '%s'\n", dtext->fontcolor_string);

  447.         return err;

  448.     }

  449. 

  450.     if ((err = av_parse_color(dtext->boxcolor.rgba, dtext->boxcolor_string, -1, ctx))) {

  451.         av_log(ctx, AV_LOG_ERROR,

  452.                "Invalid box color '%s'\n", dtext->boxcolor_string);

  453.         return err;

  454.     }

  455. 

  456.     if ((err = av_parse_color(dtext->shadowcolor.rgba, dtext->shadowcolor_string, -1, ctx))) {

  457.         av_log(ctx, AV_LOG_ERROR,

  458.                "Invalid shadow color '%s'\n", dtext->shadowcolor_string);

  459.         return err;

  460.     }

  461. 

  462.     if ((err = FT_Init_FreeType(&(dtext->library)))) {

  463.         av_log(ctx, AV_LOG_ERROR,

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

  465.         return AVERROR(EINVAL);

  466.     }

  467. 

  468.     err = load_font(ctx);

  469.     if (err)

  470.         return err;

  471.     if (!dtext->fontsize)

  472.         dtext->fontsize = 16;

  473.     if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {

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

  475.                dtext->fontsize, FT_ERRMSG(err));

  476.         return AVERROR(EINVAL);

  477.     }

  478. 

  479.     dtext->use_kerning = FT_HAS_KERNING(dtext->face);

  480. 

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

  482.     load_glyph(ctx, NULL, 0);

  483. 

  484.     /* set the tabsize in pixels */

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

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

  487.         return err;

  488.     }

  489.     dtext->tabsize *= glyph->advance;

  490. 

  491.     return 0;

  492. }

  493. 

  494. static int query_formats(AVFilterContext *ctx)

  495. {

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

  497.     return 0;

  498. }

  499. 

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

  501. {

  502.     Glyph *glyph = elem;

  503. 

  504.     FT_Done_Glyph(*glyph->glyph);

  505.     av_freep(&glyph->glyph);

  506.     av_free(elem);

  507.     return 0;

  508. }

  509. 

  510. static av_cold void uninit(AVFilterContext *ctx)

  511. {

  512.     DrawTextContext *dtext = ctx->priv;

  513. 

  514.     av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;

  515.     av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;

  516.     av_expr_free(dtext->draw_pexpr); dtext->draw_pexpr = NULL;

  517. 

  518.     av_freep(&dtext->boxcolor_string);

  519.     av_freep(&dtext->expanded_text);

  520.     av_freep(&dtext->fontcolor_string);

  521.     av_freep(&dtext->fontfile);

  522.     av_freep(&dtext->shadowcolor_string);

  523.     av_freep(&dtext->text);

  524.     av_freep(&dtext->x_expr);

  525.     av_freep(&dtext->y_expr);

  526.     av_freep(&dtext->draw_expr);

  527. 

  528.     av_freep(&dtext->positions);

  529.     dtext->nb_positions = 0;

  530. 

  531.     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);

  532.     av_tree_destroy(dtext->glyphs);

  533.     dtext->glyphs = NULL;

  534. 

  535.     FT_Done_Face(dtext->face);

  536.     FT_Done_FreeType(dtext->library);

  537. }

  538. 

  539. static inline int is_newline(uint32_t c)

  540. {

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

  542. }

  543. 

  544. static int config_input(AVFilterLink *inlink)

  545. {

  546.     AVFilterContext *ctx = inlink->dst;

  547.     DrawTextContext *dtext = ctx->priv;

  548.     int ret;

  549. 

  550.     ff_draw_init(&dtext->dc, inlink->format, 0);

  551.     ff_draw_color(&dtext->dc, &dtext->fontcolor,   dtext->fontcolor.rgba);

  552.     ff_draw_color(&dtext->dc, &dtext->shadowcolor, dtext->shadowcolor.rgba);

  553.     ff_draw_color(&dtext->dc, &dtext->boxcolor,    dtext->boxcolor.rgba);

  554. 

  555.     dtext->var_values[VAR_w]     = dtext->var_values[VAR_W]     = dtext->var_values[VAR_MAIN_W] = inlink->w;

  556.     dtext->var_values[VAR_h]     = dtext->var_values[VAR_H]     = dtext->var_values[VAR_MAIN_H] = inlink->h;

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

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

  559.     dtext->var_values[VAR_HSUB]  = 1 << dtext->dc.hsub_max;

  560.     dtext->var_values[VAR_VSUB]  = 1 << dtext->dc.vsub_max;

  561.     dtext->var_values[VAR_X]     = NAN;

  562.     dtext->var_values[VAR_Y]     = NAN;

  563.     if (!dtext->reinit)

  564.         dtext->var_values[VAR_N] = 0;

  565.     dtext->var_values[VAR_T]     = NAN;

  566. 

  567.     av_lfg_init(&dtext->prng, av_get_random_seed());

  568. 

  569.     if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,

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

  571.         (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,

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

  573.         (ret = av_expr_parse(&dtext->draw_pexpr, dtext->draw_expr, var_names,

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

  575. 

  576.         return AVERROR(EINVAL);

  577. 

  578.     return 0;

  579. }

  580. 

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

  582. {

  583.     DrawTextContext *dtext = ctx->priv;

  584. 

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

  586.         int ret;

  587.         uninit(ctx);

  588.         dtext->reinit = 1;

  589.         if ((ret = init(ctx, arg, NULL)) < 0)

  590.             return ret;

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

  592.     }

  593. 

  594.     return AVERROR(ENOSYS);

  595. }

  596. 

  597. static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,

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

  599. {

  600.     char *text = dtext->expanded_text;

  601.     uint32_t code = 0;

  602.     int i, x1, y1;

  603.     uint8_t *p;

  604.     Glyph *glyph = NULL;

  605. 

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

  607.         Glyph dummy = { 0 };

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

  609. 

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

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

  612.             continue;

  613. 

  614.         dummy.code = code;

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

  616. 

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

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

  619.             return AVERROR(EINVAL);

  620. 

  621.         x1 = dtext->positions[i].x+dtext->x+x;

  622.         y1 = dtext->positions[i].y+dtext->y+y;

  623. 

  624.         ff_blend_mask(&dtext->dc, color,

  625.                       picref->data, picref->linesize, width, height,

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

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

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

  629.                       0, x1, y1);

  630.     }

  631. 

  632.     return 0;

  633. }

  634. 

  635. static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,

  636.                      int width, int height)

  637. {

  638.     DrawTextContext *dtext = ctx->priv;

  639.     uint32_t code = 0, prev_code = 0;

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

  641.     int max_text_line_w = 0, len;

  642.     int box_w, box_h;

  643.     char *text = dtext->text;

  644.     uint8_t *p;

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

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

  647.     FT_Vector delta;

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

  649.     Glyph dummy = { 0 };

  650. 

  651.     time_t now = time(0);

  652.     struct tm ltime;

  653.     uint8_t *buf = dtext->expanded_text;

  654.     int buf_size = dtext->expanded_text_size;

  655. 

  656.     if(dtext->basetime != AV_NOPTS_VALUE)

  657.         now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;

  658. 

  659.     if (!buf) {

  660.         buf_size = 2*strlen(dtext->text)+1;

  661.         buf = av_malloc(buf_size);

  662.     }

  663. 

  664. #if HAVE_LOCALTIME_R

  665.     localtime_r(&now, &ltime);

  666. #else

  667.     if(strchr(dtext->text, '%'))

  668.         ltime= *localtime(&now);

  669. #endif

  670. 

  671.     do {

  672.         *buf = 1;

  673.         if (strftime(buf, buf_size, dtext->text, &ltime) != 0 || *buf == 0)

  674.             break;

  675.         buf_size *= 2;

  676.     } while ((buf = av_realloc(buf, buf_size)));

  677. 

  678.     if (dtext->tc_opt_string) {

  679.         char tcbuf[AV_TIMECODE_STR_SIZE];

  680.         av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);

  681.         buf = av_asprintf("%s%s", dtext->text, tcbuf);

  682.     }

  683. 

  684.     if (!buf)

  685.         return AVERROR(ENOMEM);

  686.     text = dtext->expanded_text = buf;

  687.     dtext->expanded_text_size = buf_size;

  688.     if ((len = strlen(text)) > dtext->nb_positions) {

  689.         if (!(dtext->positions =

  690.               av_realloc(dtext->positions, len*sizeof(*dtext->positions))))

  691.             return AVERROR(ENOMEM);

  692.         dtext->nb_positions = len;

  693.     }

  694. 

  695.     x = 0;

  696.     y = 0;

  697. 

  698.     /* load and cache glyphs */

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

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

  701. 

  702.         /* get glyph */

  703.         dummy.code = code;

  704.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  705.         if (!glyph) {

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

  707.         }

  708. 

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

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

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

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

  713.     }

  714.     dtext->max_glyph_h = y_max - y_min;

  715.     dtext->max_glyph_w = x_max - x_min;

  716. 

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

  718.     glyph = NULL;

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

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

  721. 

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

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

  724.             continue;

  725. 

  726.         prev_code = code;

  727.         if (is_newline(code)) {

  728.             max_text_line_w = FFMAX(max_text_line_w, x);

  729.             y += dtext->max_glyph_h;

  730.             x = 0;

  731.             continue;

  732.         }

  733. 

  734.         /* get glyph */

  735.         prev_glyph = glyph;

  736.         dummy.code = code;

  737.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  738. 

  739.         /* kerning */

  740.         if (dtext->use_kerning && prev_glyph && glyph->code) {

  741.             FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,

  742.                            ft_kerning_default, &delta);

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

  744.         }

  745. 

  746.         /* save position */

  747.         dtext->positions[i].x = x + glyph->bitmap_left;

  748.         dtext->positions[i].y = y - glyph->bitmap_top + y_max;

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

  750.         else              x += glyph->advance;

  751.     }

  752. 

  753.     max_text_line_w = FFMAX(x, max_text_line_w);

  754. 

  755.     dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;

  756.     dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;

  757. 

  758.     dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;

  759.     dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;

  760.     dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;

  761.     dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;

  762. 

  763.     dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;

  764. 

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

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

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

  768.     dtext->draw = av_expr_eval(dtext->draw_pexpr, dtext->var_values, &dtext->prng);

  769. 

  770.     if(!dtext->draw)

  771.         return 0;

  772. 

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

  774.     box_h = FFMIN(height - 1, y + dtext->max_glyph_h);

  775. 

  776.     /* draw box */

  777.     if (dtext->draw_box)

  778.         ff_blend_rectangle(&dtext->dc, &dtext->boxcolor,

  779.                            picref->data, picref->linesize, width, height,

  780.                            dtext->x, dtext->y, box_w, box_h);

  781. 

  782.     if (dtext->shadowx || dtext->shadowy) {

  783.         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor.rgba,

  784.                                &dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)

  785.             return ret;

  786.     }

  787. 

  788.     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor.rgba,

  789.                            &dtext->fontcolor, 0, 0)) < 0)

  790.         return ret;

  791. 

  792.     return 0;

  793. }

  794. 

  795. static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }

  796. 

  797. static void end_frame(AVFilterLink *inlink)

  798. {

  799.     AVFilterContext *ctx = inlink->dst;

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

  801.     DrawTextContext *dtext = ctx->priv;

  802.     AVFilterBufferRef *picref = inlink->cur_buf;

  803. 

  804.     dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?

  805.         NAN : picref->pts * av_q2d(inlink->time_base);

  806. 

  807.     draw_text(ctx, picref, picref->video->w, picref->video->h);

  808. 

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

  810.            (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],

  811.            (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],

  812.            dtext->x, dtext->y);

  813. 

  814.     dtext->var_values[VAR_N] += 1.0;

  815. 

  816.     ff_draw_slice(outlink, 0, picref->video->h, 1);

  817.     ff_end_frame(outlink);

  818. }

  819. 

  820. AVFilter avfilter_vf_drawtext = {

  821.     .name          = "drawtext",

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

  823.     .priv_size     = sizeof(DrawTextContext),

  824.     .init          = init,

  825.     .uninit        = uninit,

  826.     .query_formats = query_formats,

  827. 

  828.     .inputs    = (const AVFilterPad[]) {{ .name       = "default",

  829.                                     .type             = AVMEDIA_TYPE_VIDEO,

  830.                                     .get_video_buffer = ff_null_get_video_buffer,

  831.                                     .start_frame      = ff_null_start_frame,

  832.                                     .draw_slice       = null_draw_slice,

  833.                                     .end_frame        = end_frame,

  834.                                     .config_props     = config_input,

  835.                                     .min_perms        = AV_PERM_WRITE |

  836.                                                         AV_PERM_READ,

  837.                                     .rej_perms        = AV_PERM_PRESERVE },

  838.                                   { .name = NULL}},

  839.     .outputs   = (const AVFilterPad[]) {{ .name       = "default",

  840.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  841.                                   { .name = NULL}},

  842.     .process_command = command,

  843. };