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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. 

  45. #undef time

  46. 

  47. #include <ft2build.h>

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

  49. #include FT_FREETYPE_H

  50. #include FT_GLYPH_H

  51. #if CONFIG_FONTCONFIG

  52. #include <fontconfig/fontconfig.h>

  53. #endif

  54. 

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

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

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

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

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

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

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

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

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

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

  65.     "sar",

  66.     "dar",

  67.     "hsub",

  68.     "vsub",

  69.     "x",

  70.     "y",

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

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

  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_MAIN_W, VAR_w, VAR_W,

  94.     VAR_MAIN_H, VAR_h, VAR_H,

  95.     VAR_TW, VAR_TEXT_W,

  96.     VAR_TH, VAR_TEXT_H,

  97.     VAR_MAX_GLYPH_W,

  98.     VAR_MAX_GLYPH_H,

  99.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  100.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  101.     VAR_LINE_H, VAR_LH,

  102.     VAR_SAR,

  103.     VAR_DAR,

  104.     VAR_HSUB,

  105.     VAR_VSUB,

  106.     VAR_X,

  107.     VAR_Y,

  108.     VAR_N,

  109.     VAR_T,

  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   *d_expr;

  153.     AVExpr *d_pexpr;

  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(d_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. {"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 char *drawtext_get_name(void *ctx)

  209. {

  210.     return "drawtext";

  211. }

  212. 

  213. static const AVClass drawtext_class = {

  214.     "DrawTextContext",

  215.     drawtext_get_name,

  216.     drawtext_options

  217. };

  218. 

  219. #undef __FTERRORS_H__

  220. #define FT_ERROR_START_LIST {

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

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

  223. 

  224. struct ft_error

  225. {

  226.     int err;

  227.     const char *err_msg;

  228. } static ft_errors[] =

  229. #include FT_ERRORS_H

  230. 

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

  232. 

  233. typedef struct {

  234.     FT_Glyph *glyph;

  235.     uint32_t code;

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

  237.     FT_BBox bbox;

  238.     int advance;

  239.     int bitmap_left;

  240.     int bitmap_top;

  241. } Glyph;

  242. 

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

  244. {

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

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

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

  248. }

  249. 

  250. /**

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

  252.  */

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

  254. {

  255.     DrawTextContext *dtext = ctx->priv;

  256.     Glyph *glyph;

  257.     struct AVTreeNode *node = NULL;

  258.     int ret;

  259. 

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

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

  262.         return AVERROR(EINVAL);

  263. 

  264.     /* save glyph */

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

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

  267.         ret = AVERROR(ENOMEM);

  268.         goto error;

  269.     }

  270.     glyph->code  = code;

  271. 

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

  273.         ret = AVERROR(EINVAL);

  274.         goto error;

  275.     }

  276. 

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

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

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

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

  281. 

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

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

  284. 

  285.     /* cache the newly created glyph */

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

  287.         ret = AVERROR(ENOMEM);

  288.         goto error;

  289.     }

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

  291. 

  292.     if (glyph_ptr)

  293.         *glyph_ptr = glyph;

  294.     return 0;

  295. 

  296. error:

  297.     if (glyph)

  298.         av_freep(&glyph->glyph);

  299.     av_freep(&glyph);

  300.     av_freep(&node);

  301.     return ret;

  302. }

  303. 

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

  305.                           const char **error)

  306. {

  307.     DrawTextContext *dtext = ctx->priv;

  308.     int err;

  309. 

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

  311.     if (err) {

  312.         *error = FT_ERRMSG(err);

  313.         return AVERROR(EINVAL);

  314.     }

  315.     return 0;

  316. }

  317. 

  318. #if CONFIG_FONTCONFIG

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

  320. {

  321.     DrawTextContext *dtext = ctx->priv;

  322.     FcConfig *fontconfig;

  323.     FcPattern *pattern, *fpat;

  324.     FcResult result = FcResultMatch;

  325.     FcChar8 *filename;

  326.     int err, index;

  327.     double size;

  328. 

  329.     fontconfig = FcInitLoadConfigAndFonts();

  330.     if (!fontconfig) {

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

  332.         return AVERROR(EINVAL);

  333.     }

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

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

  336.     if (!pattern) {

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

  338.         return AVERROR(EINVAL);

  339.     }

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

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

  342.         return AVERROR(EINVAL);

  343.     }

  344.     FcDefaultSubstitute(pattern);

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

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

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

  348.         return AVERROR(EINVAL);

  349.     }

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

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

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

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

  354.         return AVERROR(EINVAL);

  355.     }

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

  357.     if (!dtext->fontsize)

  358.         dtext->fontsize = size + 0.5;

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

  360.     if (err)

  361.         return err;

  362.     FcPatternDestroy(fpat);

  363.     FcPatternDestroy(pattern);

  364.     FcConfigDestroy(fontconfig);

  365.     return 0;

  366. }

  367. #endif

  368. 

  369. static int load_font(AVFilterContext *ctx)

  370. {

  371.     DrawTextContext *dtext = ctx->priv;

  372.     int err;

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

  374. 

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

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

  377.     if (!err)

  378.         return 0;

  379. #if CONFIG_FONTCONFIG

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

  381.     if (!err)

  382.         return 0;

  383. #endif

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

  385.            dtext->fontfile, error);

  386.     return err;

  387. }

  388. 

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

  390. {

  391.     int err;

  392.     DrawTextContext *dtext = ctx->priv;

  393.     Glyph *glyph;

  394. 

  395.     dtext->class = &drawtext_class;

  396.     av_opt_set_defaults(dtext);

  397. 

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

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

  400.         return err;

  401.     }

  402. 

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

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

  405.         return AVERROR(EINVAL);

  406.     }

  407. 

  408.     if (dtext->textfile) {

  409.         uint8_t *textbuf;

  410.         size_t textbuf_size;

  411. 

  412.         if (dtext->text) {

  413.             av_log(ctx, AV_LOG_ERROR,

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

  415.             return AVERROR(EINVAL);

  416.         }

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

  418.             av_log(ctx, AV_LOG_ERROR,

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

  420.                    dtext->textfile);

  421.             return err;

  422.         }

  423. 

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

  425.             return AVERROR(ENOMEM);

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

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

  428.         av_file_unmap(textbuf, textbuf_size);

  429.     }

  430. 

  431.     if (dtext->tc_opt_string) {

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

  433.                                                dtext->tc_opt_string, ctx);

  434.         if (ret < 0)

  435.             return ret;

  436.         if (dtext->tc24hmax)

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

  438.         if (!dtext->text)

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

  440.     }

  441. 

  442.     if (!dtext->text) {

  443.         av_log(ctx, AV_LOG_ERROR,

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

  445.         return AVERROR(EINVAL);

  446.     }

  447. 

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

  449.         av_log(ctx, AV_LOG_ERROR,

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

  451.         return err;

  452.     }

  453. 

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

  455.         av_log(ctx, AV_LOG_ERROR,

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

  457.         return err;

  458.     }

  459. 

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

  461.         av_log(ctx, AV_LOG_ERROR,

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

  463.         return err;

  464.     }

  465. 

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

  467.         av_log(ctx, AV_LOG_ERROR,

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

  469.         return AVERROR(EINVAL);

  470.     }

  471. 

  472.     err = load_font(ctx);

  473.     if (err)

  474.         return err;

  475.     if (!dtext->fontsize)

  476.         dtext->fontsize = 16;

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

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

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

  480.         return AVERROR(EINVAL);

  481.     }

  482. 

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

  484. 

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

  486.     load_glyph(ctx, NULL, 0);

  487. 

  488.     /* set the tabsize in pixels */

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

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

  491.         return err;

  492.     }

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

  494. 

  495.     return 0;

  496. }

  497. 

  498. static int query_formats(AVFilterContext *ctx)

  499. {

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

  501.     return 0;

  502. }

  503. 

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

  505. {

  506.     Glyph *glyph = elem;

  507. 

  508.     FT_Done_Glyph(*glyph->glyph);

  509.     av_freep(&glyph->glyph);

  510.     av_free(elem);

  511.     return 0;

  512. }

  513. 

  514. static av_cold void uninit(AVFilterContext *ctx)

  515. {

  516.     DrawTextContext *dtext = ctx->priv;

  517. 

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

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

  520.     av_expr_free(dtext->d_pexpr); dtext->d_pexpr = NULL;

  521. 

  522.     av_freep(&dtext->boxcolor_string);

  523.     av_freep(&dtext->expanded_text);

  524.     av_freep(&dtext->fontcolor_string);

  525.     av_freep(&dtext->fontfile);

  526.     av_freep(&dtext->shadowcolor_string);

  527.     av_freep(&dtext->text);

  528.     av_freep(&dtext->x_expr);

  529.     av_freep(&dtext->y_expr);

  530.     av_freep(&dtext->d_expr);

  531. 

  532.     av_freep(&dtext->positions);

  533.     dtext->nb_positions = 0;

  534. 

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

  536.     av_tree_destroy(dtext->glyphs);

  537.     dtext->glyphs = NULL;

  538. 

  539.     FT_Done_Face(dtext->face);

  540.     FT_Done_FreeType(dtext->library);

  541. }

  542. 

  543. static inline int is_newline(uint32_t c)

  544. {

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

  546. }

  547. 

  548. static int config_input(AVFilterLink *inlink)

  549. {

  550.     AVFilterContext *ctx = inlink->dst;

  551.     DrawTextContext *dtext = ctx->priv;

  552.     int ret;

  553. 

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

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

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

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

  558. 

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

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

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

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

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

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

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

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

  567.     if (!dtext->reinit)

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

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

  570. 

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

  572. 

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

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

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

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

  577.         (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,

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

  579. 

  580.         return AVERROR(EINVAL);

  581. 

  582.     return 0;

  583. }

  584. 

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

  586. {

  587.     DrawTextContext *dtext = ctx->priv;

  588. 

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

  590.         int ret;

  591.         uninit(ctx);

  592.         dtext->reinit = 1;

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

  594.             return ret;

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

  596.     }

  597. 

  598.     return AVERROR(ENOSYS);

  599. }

  600. 

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

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

  603. {

  604.     char *text = dtext->expanded_text;

  605.     uint32_t code = 0;

  606.     int i, x1, y1;

  607.     uint8_t *p;

  608.     Glyph *glyph = NULL;

  609. 

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

  611.         Glyph dummy = { 0 };

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

  613. 

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

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

  616.             continue;

  617. 

  618.         dummy.code = code;

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

  620. 

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

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

  623.             return AVERROR(EINVAL);

  624. 

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

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

  627. 

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

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

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

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

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

  633.                       0, x1, y1);

  634.     }

  635. 

  636.     return 0;

  637. }

  638. 

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

  640.                      int width, int height)

  641. {

  642.     DrawTextContext *dtext = ctx->priv;

  643.     uint32_t code = 0, prev_code = 0;

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

  645.     int max_text_line_w = 0, len;

  646.     int box_w, box_h;

  647.     char *text = dtext->text;

  648.     uint8_t *p;

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

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

  651.     FT_Vector delta;

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

  653.     Glyph dummy = { 0 };

  654. 

  655.     time_t now = time(0);

  656.     struct tm ltime;

  657.     uint8_t *buf = dtext->expanded_text;

  658.     int buf_size = dtext->expanded_text_size;

  659. 

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

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

  662. 

  663.     if (!buf) {

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

  665.         buf = av_malloc(buf_size);

  666.     }

  667. 

  668. #if HAVE_LOCALTIME_R

  669.     localtime_r(&now, &ltime);

  670. #else

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

  672.         ltime= *localtime(&now);

  673. #endif

  674. 

  675.     do {

  676.         *buf = 1;

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

  678.             break;

  679.         buf_size *= 2;

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

  681. 

  682.     if (dtext->tc_opt_string) {

  683.         char tcbuf[AV_TIMECODE_STR_SIZE];

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

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

  686.     }

  687. 

  688.     if (!buf)

  689.         return AVERROR(ENOMEM);

  690.     text = dtext->expanded_text = buf;

  691.     dtext->expanded_text_size = buf_size;

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

  693.         if (!(dtext->positions =

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

  695.             return AVERROR(ENOMEM);

  696.         dtext->nb_positions = len;

  697.     }

  698. 

  699.     x = 0;

  700.     y = 0;

  701. 

  702.     /* load and cache glyphs */

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

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

  705. 

  706.         /* get glyph */

  707.         dummy.code = code;

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

  709.         if (!glyph) {

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

  711.         }

  712. 

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

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

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

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

  717.     }

  718.     dtext->max_glyph_h = y_max - y_min;

  719.     dtext->max_glyph_w = x_max - x_min;

  720. 

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

  722.     glyph = NULL;

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

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

  725. 

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

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

  728.             continue;

  729. 

  730.         prev_code = code;

  731.         if (is_newline(code)) {

  732.             max_text_line_w = FFMAX(max_text_line_w, x);

  733.             y += dtext->max_glyph_h;

  734.             x = 0;

  735.             continue;

  736.         }

  737. 

  738.         /* get glyph */

  739.         prev_glyph = glyph;

  740.         dummy.code = code;

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

  742. 

  743.         /* kerning */

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

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

  746.                            ft_kerning_default, &delta);

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

  748.         }

  749. 

  750.         /* save position */

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

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

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

  754.         else              x += glyph->advance;

  755.     }

  756. 

  757.     max_text_line_w = FFMAX(x, max_text_line_w);

  758. 

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

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

  761. 

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

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

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

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

  766. 

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

  768. 

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

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

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

  772.     dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);

  773. 

  774.     if(!dtext->draw)

  775.         return 0;

  776. 

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

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

  779. 

  780.     /* draw box */

  781.     if (dtext->draw_box)

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

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

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

  785. 

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

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

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

  789.             return ret;

  790.     }

  791. 

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

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

  794.         return ret;

  795. 

  796.     return 0;

  797. }

  798. 

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

  800. 

  801. static void end_frame(AVFilterLink *inlink)

  802. {

  803.     AVFilterContext *ctx = inlink->dst;

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

  805.     DrawTextContext *dtext = ctx->priv;

  806.     AVFilterBufferRef *picref = inlink->cur_buf;

  807. 

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

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

  810. 

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

  812. 

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

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

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

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

  817. 

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

  819. 

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

  821.     avfilter_end_frame(outlink);

  822. }

  823. 

  824. AVFilter avfilter_vf_drawtext = {

  825.     .name          = "drawtext",

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

  827.     .priv_size     = sizeof(DrawTextContext),

  828.     .init          = init,

  829.     .uninit        = uninit,

  830.     .query_formats = query_formats,

  831. 

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

  833.                                     .type             = AVMEDIA_TYPE_VIDEO,

  834.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  835.                                     .start_frame      = avfilter_null_start_frame,

  836.                                     .draw_slice       = null_draw_slice,

  837.                                     .end_frame        = end_frame,

  838.                                     .config_props     = config_input,

  839.                                     .min_perms        = AV_PERM_WRITE |

  840.                                                         AV_PERM_READ,

  841.                                     .rej_perms        = AV_PERM_PRESERVE },

  842.                                   { .name = NULL}},

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

  844.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  845.                                   { .name = NULL}},

  846.     .process_command = command,

  847. };