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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 "video.h"

  45. 

  46. #undef time

  47. 

  48. #include <ft2build.h>

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

  50. #include FT_FREETYPE_H

  51. #include FT_GLYPH_H

  52. #if CONFIG_FONTCONFIG

  53. #include <fontconfig/fontconfig.h>

  54. #endif

  55. 

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

  57.     "dar",

  58.     "hsub", "vsub",

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

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

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

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

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

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

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

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

  67.     "sar",

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

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

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

  71.     "x",

  72.     "y",

  73.     NULL

  74. };

  75. 

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

  77.     "rand"

  78. };

  79. 

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

  81. {

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

  83. }

  84. 

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

  86. 

  87. static const eval_func2 fun2[] = {

  88.     drand,

  89.     NULL

  90. };

  91. 

  92. enum var_name {

  93.     VAR_DAR,

  94.     VAR_HSUB, VAR_VSUB,

  95.     VAR_LINE_H, VAR_LH,

  96.     VAR_MAIN_H, VAR_h, VAR_H,

  97.     VAR_MAIN_W, VAR_w, VAR_W,

  98.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  99.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  100.     VAR_MAX_GLYPH_H,

  101.     VAR_MAX_GLYPH_W,

  102.     VAR_N,

  103.     VAR_SAR,

  104.     VAR_T,

  105.     VAR_TEXT_H, VAR_TH,

  106.     VAR_TEXT_W, VAR_TW,

  107.     VAR_X,

  108.     VAR_Y,

  109.     VAR_VARS_NB

  110. };

  111. 

  112. typedef struct {

  113.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

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

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

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

  127.     int shadowx, shadowy;

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

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

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

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

  132. 

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

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

  135.     int tabsize;                    ///< tab size

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

  137. 

  138.     FFDrawContext dc;

  139.     FFDrawColor fontcolor;          ///< foreground color

  140.     FFDrawColor shadowcolor;        ///< shadow color

  141.     FFDrawColor boxcolor;           ///< background color

  142. 

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

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

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

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

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

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

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

  150.     double var_values[VAR_VARS_NB];

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

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

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

  154.     AVLFG  prng;                    ///< random

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

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

  157.     AVTimecode  tc;                 ///< timecode context

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

  159.     int frame_id;

  160. } DrawTextContext;

  161. 

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

  163. 

  164. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  187. 

  188. /* FT_LOAD_* flags */

  189. {"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" },

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

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

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

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

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

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

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

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

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

  199. {"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" },

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

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

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

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

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

  205. {NULL},

  206. };

  207. 

  208. static const AVClass drawtext_class = {

  209.     "DrawTextContext",

  210.     av_default_item_name,

  211.     drawtext_options

  212. };

  213. 

  214. #undef __FTERRORS_H__

  215. #define FT_ERROR_START_LIST {

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

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

  218. 

  219. struct ft_error

  220. {

  221.     int err;

  222.     const char *err_msg;

  223. } static ft_errors[] =

  224. #include FT_ERRORS_H

  225. 

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

  227. 

  228. typedef struct {

  229.     FT_Glyph *glyph;

  230.     uint32_t code;

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

  232.     FT_BBox bbox;

  233.     int advance;

  234.     int bitmap_left;

  235.     int bitmap_top;

  236. } Glyph;

  237. 

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

  239. {

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

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

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

  243. }

  244. 

  245. /**

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

  247.  */

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

  249. {

  250.     DrawTextContext *dtext = ctx->priv;

  251.     Glyph *glyph;

  252.     struct AVTreeNode *node = NULL;

  253.     int ret;

  254. 

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

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

  257.         return AVERROR(EINVAL);

  258. 

  259.     /* save glyph */

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

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

  262.         ret = AVERROR(ENOMEM);

  263.         goto error;

  264.     }

  265.     glyph->code  = code;

  266. 

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

  268.         ret = AVERROR(EINVAL);

  269.         goto error;

  270.     }

  271. 

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

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

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

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

  276. 

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

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

  279. 

  280.     /* cache the newly created glyph */

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

  282.         ret = AVERROR(ENOMEM);

  283.         goto error;

  284.     }

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

  286. 

  287.     if (glyph_ptr)

  288.         *glyph_ptr = glyph;

  289.     return 0;

  290. 

  291. error:

  292.     if (glyph)

  293.         av_freep(&glyph->glyph);

  294.     av_freep(&glyph);

  295.     av_freep(&node);

  296.     return ret;

  297. }

  298. 

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

  300.                           const char **error)

  301. {

  302.     DrawTextContext *dtext = ctx->priv;

  303.     int err;

  304. 

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

  306.     if (err) {

  307.         *error = FT_ERRMSG(err);

  308.         return AVERROR(EINVAL);

  309.     }

  310.     return 0;

  311. }

  312. 

  313. #if CONFIG_FONTCONFIG

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

  315. {

  316.     DrawTextContext *dtext = ctx->priv;

  317.     FcConfig *fontconfig;

  318.     FcPattern *pattern, *fpat;

  319.     FcResult result = FcResultMatch;

  320.     FcChar8 *filename;

  321.     int err, index;

  322.     double size;

  323. 

  324.     fontconfig = FcInitLoadConfigAndFonts();

  325.     if (!fontconfig) {

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

  327.         return AVERROR(EINVAL);

  328.     }

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

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

  331.     if (!pattern) {

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

  333.         return AVERROR(EINVAL);

  334.     }

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

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

  337.         return AVERROR(EINVAL);

  338.     }

  339.     FcDefaultSubstitute(pattern);

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

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

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

  343.         return AVERROR(EINVAL);

  344.     }

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

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

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

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

  349.         return AVERROR(EINVAL);

  350.     }

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

  352.     if (!dtext->fontsize)

  353.         dtext->fontsize = size + 0.5;

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

  355.     if (err)

  356.         return err;

  357.     FcPatternDestroy(fpat);

  358.     FcPatternDestroy(pattern);

  359.     FcConfigDestroy(fontconfig);

  360.     return 0;

  361. }

  362. #endif

  363. 

  364. static int load_font(AVFilterContext *ctx)

  365. {

  366.     DrawTextContext *dtext = ctx->priv;

  367.     int err;

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

  369. 

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

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

  372.     if (!err)

  373.         return 0;

  374. #if CONFIG_FONTCONFIG

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

  376.     if (!err)

  377.         return 0;

  378. #endif

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

  380.            dtext->fontfile, error);

  381.     return err;

  382. }

  383. 

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

  385. {

  386.     int err;

  387.     DrawTextContext *dtext = ctx->priv;

  388.     Glyph *glyph;

  389. 

  390.     dtext->class = &drawtext_class;

  391.     av_opt_set_defaults(dtext);

  392. 

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

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

  395.         return err;

  396.     }

  397. 

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

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

  400.         return AVERROR(EINVAL);

  401.     }

  402. 

  403.     if (dtext->textfile) {

  404.         uint8_t *textbuf;

  405.         size_t textbuf_size;

  406. 

  407.         if (dtext->text) {

  408.             av_log(ctx, AV_LOG_ERROR,

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

  410.             return AVERROR(EINVAL);

  411.         }

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

  413.             av_log(ctx, AV_LOG_ERROR,

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

  415.                    dtext->textfile);

  416.             return err;

  417.         }

  418. 

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

  420.             return AVERROR(ENOMEM);

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

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

  423.         av_file_unmap(textbuf, textbuf_size);

  424.     }

  425. 

  426.     if (dtext->tc_opt_string) {

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

  428.                                                dtext->tc_opt_string, ctx);

  429.         if (ret < 0)

  430.             return ret;

  431.         if (dtext->tc24hmax)

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

  433.         if (!dtext->text)

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

  435.     }

  436. 

  437.     if (!dtext->text) {

  438.         av_log(ctx, AV_LOG_ERROR,

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

  440.         return AVERROR(EINVAL);

  441.     }

  442. 

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

  444.         av_log(ctx, AV_LOG_ERROR,

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

  446.         return err;

  447.     }

  448. 

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

  450.         av_log(ctx, AV_LOG_ERROR,

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

  452.         return err;

  453.     }

  454. 

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

  456.         av_log(ctx, AV_LOG_ERROR,

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

  458.         return err;

  459.     }

  460. 

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

  462.         av_log(ctx, AV_LOG_ERROR,

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

  464.         return AVERROR(EINVAL);

  465.     }

  466. 

  467.     err = load_font(ctx);

  468.     if (err)

  469.         return err;

  470.     if (!dtext->fontsize)

  471.         dtext->fontsize = 16;

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

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

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

  475.         return AVERROR(EINVAL);

  476.     }

  477. 

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

  479. 

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

  481.     load_glyph(ctx, NULL, 0);

  482. 

  483.     /* set the tabsize in pixels */

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

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

  486.         return err;

  487.     }

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

  489. 

  490.     return 0;

  491. }

  492. 

  493. static int query_formats(AVFilterContext *ctx)

  494. {

  495.     avfilter_set_common_pixel_formats(ctx, ff_draw_supported_pixel_formats(0));

  496.     return 0;

  497. }

  498. 

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

  500. {

  501.     Glyph *glyph = elem;

  502. 

  503.     FT_Done_Glyph(*glyph->glyph);

  504.     av_freep(&glyph->glyph);

  505.     av_free(elem);

  506.     return 0;

  507. }

  508. 

  509. static av_cold void uninit(AVFilterContext *ctx)

  510. {

  511.     DrawTextContext *dtext = ctx->priv;

  512. 

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

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

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

  516. 

  517.     av_freep(&dtext->boxcolor_string);

  518.     av_freep(&dtext->expanded_text);

  519.     av_freep(&dtext->fontcolor_string);

  520.     av_freep(&dtext->fontfile);

  521.     av_freep(&dtext->shadowcolor_string);

  522.     av_freep(&dtext->text);

  523.     av_freep(&dtext->x_expr);

  524.     av_freep(&dtext->y_expr);

  525.     av_freep(&dtext->draw_expr);

  526. 

  527.     av_freep(&dtext->positions);

  528.     dtext->nb_positions = 0;

  529. 

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

  531.     av_tree_destroy(dtext->glyphs);

  532.     dtext->glyphs = NULL;

  533. 

  534.     FT_Done_Face(dtext->face);

  535.     FT_Done_FreeType(dtext->library);

  536. }

  537. 

  538. static inline int is_newline(uint32_t c)

  539. {

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

  541. }

  542. 

  543. static int config_input(AVFilterLink *inlink)

  544. {

  545.     AVFilterContext *ctx = inlink->dst;

  546.     DrawTextContext *dtext = ctx->priv;

  547.     int ret;

  548. 

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

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

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

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

  553. 

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

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

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

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

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

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

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

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

  562.     if (!dtext->reinit)

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

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

  565. 

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

  567. 

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

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

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

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

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

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

  574. 

  575.         return AVERROR(EINVAL);

  576. 

  577.     return 0;

  578. }

  579. 

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

  581. {

  582.     DrawTextContext *dtext = ctx->priv;

  583. 

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

  585.         int ret;

  586.         uninit(ctx);

  587.         dtext->reinit = 1;

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

  589.             return ret;

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

  591.     }

  592. 

  593.     return AVERROR(ENOSYS);

  594. }

  595. 

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

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

  598. {

  599.     char *text = dtext->expanded_text;

  600.     uint32_t code = 0;

  601.     int i, x1, y1;

  602.     uint8_t *p;

  603.     Glyph *glyph = NULL;

  604. 

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

  606.         Glyph dummy = { 0 };

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

  608. 

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

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

  611.             continue;

  612. 

  613.         dummy.code = code;

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

  615. 

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

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

  618.             return AVERROR(EINVAL);

  619. 

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

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

  622. 

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

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

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

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

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

  628.                       0, x1, y1);

  629.     }

  630. 

  631.     return 0;

  632. }

  633. 

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

  635.                      int width, int height)

  636. {

  637.     DrawTextContext *dtext = ctx->priv;

  638.     uint32_t code = 0, prev_code = 0;

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

  640.     int max_text_line_w = 0, len;

  641.     int box_w, box_h;

  642.     char *text = dtext->text;

  643.     uint8_t *p;

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

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

  646.     FT_Vector delta;

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

  648.     Glyph dummy = { 0 };

  649. 

  650.     time_t now = time(0);

  651.     struct tm ltime;

  652.     uint8_t *buf = dtext->expanded_text;

  653.     int buf_size = dtext->expanded_text_size;

  654. 

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

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

  657. 

  658.     if (!buf) {

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

  660.         buf = av_malloc(buf_size);

  661.     }

  662. 

  663. #if HAVE_LOCALTIME_R

  664.     localtime_r(&now, &ltime);

  665. #else

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

  667.         ltime= *localtime(&now);

  668. #endif

  669. 

  670.     do {

  671.         *buf = 1;

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

  673.             break;

  674.         buf_size *= 2;

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

  676. 

  677.     if (dtext->tc_opt_string) {

  678.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

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

  681.     }

  682. 

  683.     if (!buf)

  684.         return AVERROR(ENOMEM);

  685.     text = dtext->expanded_text = buf;

  686.     dtext->expanded_text_size = buf_size;

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

  688.         if (!(dtext->positions =

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

  690.             return AVERROR(ENOMEM);

  691.         dtext->nb_positions = len;

  692.     }

  693. 

  694.     x = 0;

  695.     y = 0;

  696. 

  697.     /* load and cache glyphs */

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

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

  700. 

  701.         /* get glyph */

  702.         dummy.code = code;

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

  704.         if (!glyph) {

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

  706.         }

  707. 

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

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

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

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

  712.     }

  713.     dtext->max_glyph_h = y_max - y_min;

  714.     dtext->max_glyph_w = x_max - x_min;

  715. 

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

  717.     glyph = NULL;

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

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

  720. 

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

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

  723.             continue;

  724. 

  725.         prev_code = code;

  726.         if (is_newline(code)) {

  727.             max_text_line_w = FFMAX(max_text_line_w, x);

  728.             y += dtext->max_glyph_h;

  729.             x = 0;

  730.             continue;

  731.         }

  732. 

  733.         /* get glyph */

  734.         prev_glyph = glyph;

  735.         dummy.code = code;

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

  737. 

  738.         /* kerning */

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

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

  741.                            ft_kerning_default, &delta);

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

  743.         }

  744. 

  745.         /* save position */

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

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

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

  749.         else              x += glyph->advance;

  750.     }

  751. 

  752.     max_text_line_w = FFMAX(x, max_text_line_w);

  753. 

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

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

  756. 

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

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

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

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

  761. 

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

  763. 

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

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

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

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

  768. 

  769.     if(!dtext->draw)

  770.         return 0;

  771. 

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

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

  774. 

  775.     /* draw box */

  776.     if (dtext->draw_box)

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

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

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

  780. 

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

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

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

  784.             return ret;

  785.     }

  786. 

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

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

  789.         return ret;

  790. 

  791.     return 0;

  792. }

  793. 

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

  795. 

  796. static void end_frame(AVFilterLink *inlink)

  797. {

  798.     AVFilterContext *ctx = inlink->dst;

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

  800.     DrawTextContext *dtext = ctx->priv;

  801.     AVFilterBufferRef *picref = inlink->cur_buf;

  802. 

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

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

  805. 

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

  807. 

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

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

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

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

  812. 

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

  814. 

  815.     avfilter_draw_slice(outlink, 0, picref->video->h, 1);

  816.     avfilter_end_frame(outlink);

  817. }

  818. 

  819. AVFilter avfilter_vf_drawtext = {

  820.     .name          = "drawtext",

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

  822.     .priv_size     = sizeof(DrawTextContext),

  823.     .init          = init,

  824.     .uninit        = uninit,

  825.     .query_formats = query_formats,

  826. 

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

  828.                                     .type             = AVMEDIA_TYPE_VIDEO,

  829.                                     .get_video_buffer = ff_null_get_video_buffer,

  830.                                     .start_frame      = ff_null_start_frame,

  831.                                     .draw_slice       = null_draw_slice,

  832.                                     .end_frame        = end_frame,

  833.                                     .config_props     = config_input,

  834.                                     .min_perms        = AV_PERM_WRITE |

  835.                                                         AV_PERM_READ,

  836.                                     .rej_perms        = AV_PERM_PRESERVE },

  837.                                   { .name = NULL}},

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

  839.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  840.                                   { .name = NULL}},

  841.     .process_command = command,

  842. };