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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 Libav.

  7.  *

  8.  * Libav 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.  * Libav 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 Libav; 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 "libavutil/colorspace.h"

  33. #include "libavutil/file.h"

  34. #include "libavutil/eval.h"

  35. #include "libavutil/opt.h"

  36. #include "libavutil/mathematics.h"

  37. #include "libavutil/random_seed.h"

  38. #include "libavutil/parseutils.h"

  39. #include "libavutil/pixdesc.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 "internal.h"

  46. #include "video.h"

  47. 

  48. #undef time

  49. 

  50. #include <ft2build.h>

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

  52. #include FT_FREETYPE_H

  53. #include FT_GLYPH_H

  54. 

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

  56.     "E",

  57.     "PHI",

  58.     "PI",

  59.     "main_w",    "W", ///< width  of the main    video

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

  61.     "text_w",    "w", ///< width  of the overlay text

  62.     "text_h",    "h", ///< height of the overlay text

  63.     "x",

  64.     "y",

  65.     "n",              ///< number of processed frames

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

  67.     NULL

  68. };

  69. 

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

  71.     "rand"

  72. };

  73. 

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

  75. {

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

  77. }

  78. 

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

  80. 

  81. static const eval_func2 fun2[] = {

  82.     drand,

  83.     NULL

  84. };

  85. 

  86. enum var_name {

  87.     VAR_E,

  88.     VAR_PHI,

  89.     VAR_PI,

  90.     VAR_MAIN_W, VAR_MW,

  91.     VAR_MAIN_H, VAR_MH,

  92.     VAR_TEXT_W, VAR_TW,

  93.     VAR_TEXT_H, VAR_TH,

  94.     VAR_X,

  95.     VAR_Y,

  96.     VAR_N,

  97.     VAR_T,

  98.     VAR_VARS_NB

  99. };

  100. 

  101. typedef struct {

  102.     const AVClass *class;

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

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

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

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

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

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

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

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

  111.     int x, y;                       ///< position to start drawing text

  112.     int w, h;                       ///< dimension of the text block

  113.     int shadowx, shadowy;

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

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

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

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

  118.     uint8_t fontcolor[4];           ///< foreground color

  119.     uint8_t boxcolor[4];            ///< background color

  120.     uint8_t shadowcolor[4];         ///< shadow color

  121.     uint8_t fontcolor_rgba[4];      ///< foreground color in RGBA

  122.     uint8_t boxcolor_rgba[4];       ///< background color in RGBA

  123.     uint8_t shadowcolor_rgba[4];    ///< shadow color in RGBA

  124. 

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

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

  127.     int tabsize;                    ///< tab size

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

  129. 

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

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

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

  133.     int hsub, vsub;                 ///< chroma subsampling values

  134.     int is_packed_rgb;

  135.     int pixel_step[4];              ///< distance in bytes between the component of each pixel

  136.     uint8_t rgba_map[4];            ///< map RGBA offsets to the positions in the packed RGBA format

  137.     uint8_t *box_line[4];           ///< line used for filling the box background

  138.     char   *x_expr, *y_expr;

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

  140.     double var_values[VAR_VARS_NB];

  141.     char   *d_expr;

  142.     AVExpr *d_pexpr;

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

  144.     AVLFG  prng;                    ///< random

  145. } DrawTextContext;

  146. 

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

  148. 

  149. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

  157. {"fontsize", "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.dbl=16},    1,        72       },

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

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

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

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

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

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

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

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

  166. 

  167. /* FT_LOAD_* flags */

  168. {"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" },

  169. {"default",                     "set default",                     0, AV_OPT_TYPE_CONST, {FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  170. {"no_scale",                    "set no_scale",                    0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  171. {"no_hinting",                  "set no_hinting",                  0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  172. {"render",                      "set render",                      0, AV_OPT_TYPE_CONST, {FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  173. {"no_bitmap",                   "set no_bitmap",                   0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  174. {"vertical_layout",             "set vertical_layout",             0, AV_OPT_TYPE_CONST, {FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  175. {"force_autohint",              "set force_autohint",              0, AV_OPT_TYPE_CONST, {FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  176. {"crop_bitmap",                 "set crop_bitmap",                 0, AV_OPT_TYPE_CONST, {FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  177. {"pedantic",                    "set pedantic",                    0, AV_OPT_TYPE_CONST, {FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  178. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  179. {"no_recurse",                  "set no_recurse",                  0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  180. {"ignore_transform",            "set ignore_transform",            0, AV_OPT_TYPE_CONST, {FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  181. {"monochrome",                  "set monochrome",                  0, AV_OPT_TYPE_CONST, {FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  182. {"linear_design",               "set linear_design",               0, AV_OPT_TYPE_CONST, {FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  183. {"no_autohint",                 "set no_autohint",                 0, AV_OPT_TYPE_CONST, {FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  184. {NULL},

  185. };

  186. 

  187. static const char *drawtext_get_name(void *ctx)

  188. {

  189.     return "drawtext";

  190. }

  191. 

  192. static const AVClass drawtext_class = {

  193.     "DrawTextContext",

  194.     drawtext_get_name,

  195.     drawtext_options

  196. };

  197. 

  198. #undef __FTERRORS_H__

  199. #define FT_ERROR_START_LIST {

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

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

  202. 

  203. struct ft_error

  204. {

  205.     int err;

  206.     const char *err_msg;

  207. } static ft_errors[] =

  208. #include FT_ERRORS_H

  209. 

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

  211. 

  212. typedef struct {

  213.     FT_Glyph *glyph;

  214.     uint32_t code;

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

  216.     FT_BBox bbox;

  217.     int advance;

  218.     int bitmap_left;

  219.     int bitmap_top;

  220. } Glyph;

  221. 

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

  223. {

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

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

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

  227. }

  228. 

  229. /**

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

  231.  */

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

  233. {

  234.     DrawTextContext *dtext = ctx->priv;

  235.     Glyph *glyph;

  236.     struct AVTreeNode *node = NULL;

  237.     int ret;

  238. 

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

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

  241.         return AVERROR(EINVAL);

  242. 

  243.     /* save glyph */

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

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

  246.         ret = AVERROR(ENOMEM);

  247.         goto error;

  248.     }

  249.     glyph->code  = code;

  250. 

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

  252.         ret = AVERROR(EINVAL);

  253.         goto error;

  254.     }

  255. 

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

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

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

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

  260. 

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

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

  263. 

  264.     /* cache the newly created glyph */

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

  266.         ret = AVERROR(ENOMEM);

  267.         goto error;

  268.     }

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

  270. 

  271.     if (glyph_ptr)

  272.         *glyph_ptr = glyph;

  273.     return 0;

  274. 

  275. error:

  276.     if (glyph)

  277.         av_freep(&glyph->glyph);

  278.     av_freep(&glyph);

  279.     av_freep(&node);

  280.     return ret;

  281. }

  282. 

  283. static av_cold int init(AVFilterContext *ctx, const char *args)

  284. {

  285.     int err;

  286.     DrawTextContext *dtext = ctx->priv;

  287.     Glyph *glyph;

  288. 

  289.     dtext->class = &drawtext_class;

  290.     av_opt_set_defaults(dtext);

  291.     dtext->fontcolor_string = av_strdup("black");

  292.     dtext->boxcolor_string = av_strdup("white");

  293.     dtext->shadowcolor_string = av_strdup("black");

  294. 

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

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

  297.         return err;

  298.     }

  299. 

  300.     if (!dtext->fontfile) {

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

  302.         return AVERROR(EINVAL);

  303.     }

  304. 

  305.     if (dtext->textfile) {

  306.         uint8_t *textbuf;

  307.         size_t textbuf_size;

  308. 

  309.         if (dtext->text) {

  310.             av_log(ctx, AV_LOG_ERROR,

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

  312.             return AVERROR(EINVAL);

  313.         }

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

  315.             av_log(ctx, AV_LOG_ERROR,

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

  317.                    dtext->textfile);

  318.             return err;

  319.         }

  320. 

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

  322.             return AVERROR(ENOMEM);

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

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

  325.         av_file_unmap(textbuf, textbuf_size);

  326.     }

  327. 

  328.     if (!dtext->text) {

  329.         av_log(ctx, AV_LOG_ERROR,

  330.                "Either text or a valid file must be provided\n");

  331.         return AVERROR(EINVAL);

  332.     }

  333. 

  334.     if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {

  335.         av_log(ctx, AV_LOG_ERROR,

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

  337.         return err;

  338.     }

  339. 

  340.     if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {

  341.         av_log(ctx, AV_LOG_ERROR,

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

  343.         return err;

  344.     }

  345. 

  346.     if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {

  347.         av_log(ctx, AV_LOG_ERROR,

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

  349.         return err;

  350.     }

  351. 

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

  353.         av_log(ctx, AV_LOG_ERROR,

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

  355.         return AVERROR(EINVAL);

  356.     }

  357. 

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

  359.     if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {

  360.         av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",

  361.                dtext->fontfile, FT_ERRMSG(err));

  362.         return AVERROR(EINVAL);

  363.     }

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

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

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

  367.         return AVERROR(EINVAL);

  368.     }

  369. 

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

  371. 

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

  373.     load_glyph(ctx, NULL, 0);

  374. 

  375.     /* set the tabsize in pixels */

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

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

  378.         return err;

  379.     }

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

  381. 

  382. #if !HAVE_LOCALTIME_R

  383.     av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");

  384. #endif

  385. 

  386.     return 0;

  387. }

  388. 

  389. static int query_formats(AVFilterContext *ctx)

  390. {

  391.     static const enum PixelFormat pix_fmts[] = {

  392.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  393.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  394.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  395.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  396.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  397.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  398.         PIX_FMT_NONE

  399.     };

  400. 

  401.     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

  402.     return 0;

  403. }

  404. 

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

  406. {

  407.     av_free(elem);

  408.     return 0;

  409. }

  410. 

  411. static av_cold void uninit(AVFilterContext *ctx)

  412. {

  413.     DrawTextContext *dtext = ctx->priv;

  414.     int i;

  415. 

  416.     av_freep(&dtext->fontfile);

  417.     av_freep(&dtext->text);

  418.     av_freep(&dtext->expanded_text);

  419.     av_freep(&dtext->fontcolor_string);

  420.     av_freep(&dtext->boxcolor_string);

  421.     av_freep(&dtext->positions);

  422.     av_freep(&dtext->shadowcolor_string);

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

  424.     av_tree_destroy(dtext->glyphs);

  425.     dtext->glyphs = 0;

  426.     FT_Done_Face(dtext->face);

  427.     FT_Done_FreeType(dtext->library);

  428. 

  429.     for (i = 0; i < 4; i++) {

  430.         av_freep(&dtext->box_line[i]);

  431.         dtext->pixel_step[i] = 0;

  432.     }

  433. 

  434. }

  435. 

  436. static inline int is_newline(uint32_t c)

  437. {

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

  439. }

  440. 

  441. static int dtext_prepare_text(AVFilterContext *ctx)

  442. {

  443.     DrawTextContext *dtext = ctx->priv;

  444.     uint32_t code = 0, prev_code = 0;

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

  446.     int text_height, baseline;

  447.     char *text = dtext->text;

  448.     uint8_t *p;

  449.     int str_w = 0, len;

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

  451.     FT_Vector delta;

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

  453.     Glyph dummy = { 0 };

  454.     int width  = ctx->inputs[0]->w;

  455.     int height = ctx->inputs[0]->h;

  456. 

  457. #if HAVE_LOCALTIME_R

  458.     time_t now = time(0);

  459.     struct tm ltime;

  460.     uint8_t *buf = dtext->expanded_text;

  461.     int buf_size = dtext->expanded_text_size;

  462. 

  463.     if (!buf)

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

  465. 

  466.     localtime_r(&now, &ltime);

  467. 

  468.     while ((buf = av_realloc(buf, buf_size))) {

  469.         *buf = 1;

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

  471.             break;

  472.         buf_size *= 2;

  473.     }

  474. 

  475.     if (!buf)

  476.         return AVERROR(ENOMEM);

  477.     text = dtext->expanded_text = buf;

  478.     dtext->expanded_text_size = buf_size;

  479. #endif

  480. 

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

  482.         FT_Vector *p = av_realloc(dtext->positions,

  483.                                   len * sizeof(*dtext->positions));

  484.         if (!p) {

  485.             av_freep(dtext->positions);

  486.             dtext->nb_positions = 0;

  487.             return AVERROR(ENOMEM);

  488.         } else {

  489.             dtext->positions = p;

  490.             dtext->nb_positions = len;

  491.         }

  492.     }

  493. 

  494.     /* load and cache glyphs */

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

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

  497. 

  498.         /* get glyph */

  499.         dummy.code = code;

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

  501.         if (!glyph) {

  502.             ret = load_glyph(ctx, &glyph, code);

  503.             if (ret)

  504.                 return ret;

  505.         }

  506. 

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

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

  509.     }

  510.     text_height = y_max - y_min;

  511.     baseline    = y_max;

  512. 

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

  514.     glyph = NULL;

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

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

  517. 

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

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

  520.             continue;

  521. 

  522.         prev_code = code;

  523.         if (is_newline(code)) {

  524.             str_w = FFMAX(str_w, x - dtext->x);

  525.             y += text_height;

  526.             x = 0;

  527.             continue;

  528.         }

  529. 

  530.         /* get glyph */

  531.         prev_glyph = glyph;

  532.         dummy.code = code;

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

  534. 

  535.         /* kerning */

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

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

  538.                            ft_kerning_default, &delta);

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

  540.         }

  541. 

  542.         if (x + glyph->bbox.xMax >= width) {

  543.             str_w = FFMAX(str_w, x);

  544.             y += text_height;

  545.             x = 0;

  546.         }

  547. 

  548.         /* save position */

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

  550.         dtext->positions[i].y = y - glyph->bitmap_top + baseline;

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

  552.         else              x += glyph->advance;

  553.     }

  554. 

  555.     str_w = FFMIN(width - 1, FFMAX(str_w, x));

  556.     y     = FFMIN(y + text_height, height - 1);

  557. 

  558.     dtext->w = str_w;

  559.     dtext->var_values[VAR_TEXT_W] = dtext->var_values[VAR_TW] = dtext->w;

  560.     dtext->h = y;

  561.     dtext->var_values[VAR_TEXT_H] = dtext->var_values[VAR_TH] = dtext->h;

  562. 

  563.     return 0;

  564. }

  565. 

  566. 

  567. static int config_input(AVFilterLink *inlink)

  568. {

  569.     AVFilterContext *ctx  = inlink->dst;

  570.     DrawTextContext *dtext = ctx->priv;

  571.     const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];

  572.     int ret;

  573. 

  574.     dtext->hsub = pix_desc->log2_chroma_w;

  575.     dtext->vsub = pix_desc->log2_chroma_h;

  576. 

  577.     dtext->var_values[VAR_E  ] = M_E;

  578.     dtext->var_values[VAR_PHI] = M_PHI;

  579.     dtext->var_values[VAR_PI ] = M_PI;

  580. 

  581.     dtext->var_values[VAR_MAIN_W] =

  582.         dtext->var_values[VAR_MW] = ctx->inputs[0]->w;

  583.     dtext->var_values[VAR_MAIN_H] =

  584.         dtext->var_values[VAR_MH] = ctx->inputs[0]->h;

  585. 

  586.     dtext->var_values[VAR_X] = 0;

  587.     dtext->var_values[VAR_Y] = 0;

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

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

  590. 

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

  592. 

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

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

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

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

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

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

  599.         return AVERROR(EINVAL);

  600. 

  601.     if ((ret =

  602.          ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,

  603.                                  inlink->w, dtext->boxcolor,

  604.                                  inlink->format, dtext->boxcolor_rgba,

  605.                                  &dtext->is_packed_rgb, dtext->rgba_map)) < 0)

  606.         return ret;

  607. 

  608.     if (!dtext->is_packed_rgb) {

  609.         uint8_t *rgba = dtext->fontcolor_rgba;

  610.         dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  611.         dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  612.         dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

  613.         dtext->fontcolor[3] = rgba[3];

  614.         rgba = dtext->shadowcolor_rgba;

  615.         dtext->shadowcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);

  616.         dtext->shadowcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);

  617.         dtext->shadowcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);

  618.         dtext->shadowcolor[3] = rgba[3];

  619.     }

  620. 

  621.     dtext->draw = 1;

  622. 

  623.     return dtext_prepare_text(ctx);

  624. }

  625. 

  626. #define GET_BITMAP_VAL(r, c)                                            \

  627.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

  628.         (bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \

  629.          bitmap->buffer[(r) * bitmap->pitch +  (c)]

  630. 

  631. #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \

  632.     luma_pos    = ((x)          ) + ((y)          ) * picref->linesize[0]; \

  633.     alpha = yuva_color[3] * (val) * 129;                               \

  634.     picref->data[0][luma_pos]    = (alpha * yuva_color[0] + (255*255*129 - alpha) * picref->data[0][luma_pos]   ) >> 23; \

  635.     if (((x) & ((1<<(hsub)) - 1)) == 0 && ((y) & ((1<<(vsub)) - 1)) == 0) {\

  636.         chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \

  637.         chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \

  638.         picref->data[1][chroma_pos1] = (alpha * yuva_color[1] + (255*255*129 - alpha) * picref->data[1][chroma_pos1]) >> 23; \

  639.         picref->data[2][chroma_pos2] = (alpha * yuva_color[2] + (255*255*129 - alpha) * picref->data[2][chroma_pos2]) >> 23; \

  640.     }\

  641. }

  642. 

  643. static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,

  644.                                  unsigned int y, unsigned int width, unsigned int height,

  645.                                  const uint8_t yuva_color[4], int hsub, int vsub)

  646. {

  647.     int r, c, alpha;

  648.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  649.     uint8_t src_val;

  650. 

  651.     for (r = 0; r < bitmap->rows && r+y < height; r++) {

  652.         for (c = 0; c < bitmap->width && c+x < width; c++) {

  653.             /* get intensity value in the glyph bitmap (source) */

  654.             src_val = GET_BITMAP_VAL(r, c);

  655.             if (!src_val)

  656.                 continue;

  657. 

  658.             SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);

  659.         }

  660.     }

  661. 

  662.     return 0;

  663. }

  664. 

  665. #define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \

  666.     p   = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \

  667.     alpha = rgba_color[3] * (val) * 129;                              \

  668.     *(p+r_off) = (alpha * rgba_color[0] + (255*255*129 - alpha) * *(p+r_off)) >> 23; \

  669.     *(p+g_off) = (alpha * rgba_color[1] + (255*255*129 - alpha) * *(p+g_off)) >> 23; \

  670.     *(p+b_off) = (alpha * rgba_color[2] + (255*255*129 - alpha) * *(p+b_off)) >> 23; \

  671. }

  672. 

  673. static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,

  674.                                  unsigned int x, unsigned int y,

  675.                                  unsigned int width, unsigned int height, int pixel_step,

  676.                                  const uint8_t rgba_color[4], const uint8_t rgba_map[4])

  677. {

  678.     int r, c, alpha;

  679.     uint8_t *p;

  680.     uint8_t src_val;

  681. 

  682.     for (r = 0; r < bitmap->rows && r+y < height; r++) {

  683.         for (c = 0; c < bitmap->width && c+x < width; c++) {

  684.             /* get intensity value in the glyph bitmap (source) */

  685.             src_val = GET_BITMAP_VAL(r, c);

  686.             if (!src_val)

  687.                 continue;

  688. 

  689.             SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,

  690.                           rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);

  691.         }

  692.     }

  693. 

  694.     return 0;

  695. }

  696. 

  697. static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,

  698.                            unsigned int width, unsigned int height,

  699.                            uint8_t *line[4], int pixel_step[4], uint8_t color[4],

  700.                            int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])

  701. {

  702.     int i, j, alpha;

  703. 

  704.     if (color[3] != 0xFF) {

  705.         if (is_rgba_packed) {

  706.             uint8_t *p;

  707.             for (j = 0; j < height; j++)

  708.                 for (i = 0; i < width; i++)

  709.                     SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],

  710.                                   rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);

  711.         } else {

  712.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

  713.             for (j = 0; j < height; j++)

  714.                 for (i = 0; i < width; i++)

  715.                     SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);

  716.         }

  717.     } else {

  718.         ff_draw_rectangle(picref->data, picref->linesize,

  719.                           line, pixel_step, hsub, vsub,

  720.                           x, y, width, height);

  721.     }

  722. }

  723. 

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

  725.                        int width, int height, const uint8_t rgbcolor[4], const uint8_t yuvcolor[4], int x, int y)

  726. {

  727.     char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text;

  728.     uint32_t code = 0;

  729.     int i;

  730.     uint8_t *p;

  731.     Glyph *glyph = NULL;

  732. 

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

  734.         Glyph dummy = { 0 };

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

  736. 

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

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

  739.             continue;

  740. 

  741.         dummy.code = code;

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

  743. 

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

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

  746.             return AVERROR(EINVAL);

  747. 

  748.         if (dtext->is_packed_rgb) {

  749.             draw_glyph_rgb(picref, &glyph->bitmap,

  750.                            dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,

  751.                            dtext->pixel_step[0], rgbcolor, dtext->rgba_map);

  752.         } else {

  753.             draw_glyph_yuv(picref, &glyph->bitmap,

  754.                            dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,

  755.                            yuvcolor, dtext->hsub, dtext->vsub);

  756.         }

  757.     }

  758. 

  759.     return 0;

  760. }

  761. 

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

  763.                      int width, int height)

  764. {

  765.     DrawTextContext *dtext = ctx->priv;

  766.     int ret;

  767. 

  768.     /* draw box */

  769.     if (dtext->draw_box)

  770.         drawbox(picref, dtext->x, dtext->y, dtext->w, dtext->h,

  771.                 dtext->box_line, dtext->pixel_step, dtext->boxcolor,

  772.                 dtext->hsub, dtext->vsub, dtext->is_packed_rgb,

  773.                 dtext->rgba_map);

  774. 

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

  776.         if ((ret = draw_glyphs(dtext, picref, width, height,

  777.                                dtext->shadowcolor_rgba,

  778.                                dtext->shadowcolor,

  779.                                dtext->x + dtext->shadowx,

  780.                                dtext->y + dtext->shadowy)) < 0)

  781.             return ret;

  782.     }

  783. 

  784.     if ((ret = draw_glyphs(dtext, picref, width, height,

  785.                            dtext->fontcolor_rgba,

  786.                            dtext->fontcolor,

  787.                            dtext->x,

  788.                            dtext->y)) < 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 inline int normalize_double(int *n, double d)

  797. {

  798.     int ret = 0;

  799. 

  800.     if (isnan(d)) {

  801.         ret = AVERROR(EINVAL);

  802.     } else if (d > INT_MAX || d < INT_MIN) {

  803.         *n = d > INT_MAX ? INT_MAX : INT_MIN;

  804.         ret = AVERROR(EINVAL);

  805.     } else

  806.         *n = round(d);

  807. 

  808.     return ret;

  809. }

  810. 

  811. static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)

  812. {

  813.     AVFilterContext *ctx = inlink->dst;

  814.     DrawTextContext *dtext = ctx->priv;

  815.     int fail = 0;

  816. 

  817.     if (dtext_prepare_text(ctx) < 0) {

  818.         av_log(ctx, AV_LOG_ERROR, "Can't draw text\n");

  819.         fail = 1;

  820.     }

  821. 

  822.     dtext->var_values[VAR_T] = inpicref->pts == AV_NOPTS_VALUE ?

  823.         NAN : inpicref->pts * av_q2d(inlink->time_base);

  824.     dtext->var_values[VAR_X] =

  825.         av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);

  826.     dtext->var_values[VAR_Y] =

  827.         av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);

  828.     dtext->var_values[VAR_X] =

  829.         av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);

  830. 

  831.     dtext->draw = fail ? 0 :

  832.         av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);

  833. 

  834.     normalize_double(&dtext->x, dtext->var_values[VAR_X]);

  835.     normalize_double(&dtext->y, dtext->var_values[VAR_Y]);

  836. 

  837.     if (dtext->fix_bounds) {

  838.         if (dtext->x < 0) dtext->x = 0;

  839.         if (dtext->y < 0) dtext->y = 0;

  840.         if ((unsigned)dtext->x + (unsigned)dtext->w > inlink->w)

  841.             dtext->x = inlink->w - dtext->w;

  842.         if ((unsigned)dtext->y + (unsigned)dtext->h > inlink->h)

  843.             dtext->y = inlink->h - dtext->h;

  844.     }

  845. 

  846.     dtext->x &= ~((1 << dtext->hsub) - 1);

  847.     dtext->y &= ~((1 << dtext->vsub) - 1);

  848. 

  849.     av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",

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

  851.             dtext->x, dtext->y, dtext->x+dtext->w, dtext->y+dtext->h);

  852. 

  853.     ff_start_frame(inlink->dst->outputs[0], inpicref);

  854. }

  855. 

  856. static void end_frame(AVFilterLink *inlink)

  857. {

  858.     AVFilterLink *outlink = inlink->dst->outputs[0];

  859.     AVFilterBufferRef *picref = inlink->cur_buf;

  860.     DrawTextContext *dtext = inlink->dst->priv;

  861. 

  862.     if (dtext->draw)

  863.         draw_text(inlink->dst, picref, picref->video->w, picref->video->h);

  864. 

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

  866. 

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

  868.     ff_end_frame(outlink);

  869. }

  870. 

  871. AVFilter avfilter_vf_drawtext = {

  872.     .name          = "drawtext",

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

  874.     .priv_size     = sizeof(DrawTextContext),

  875.     .init          = init,

  876.     .uninit        = uninit,

  877.     .query_formats = query_formats,

  878. 

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

  880.                                     .type             = AVMEDIA_TYPE_VIDEO,

  881.                                     .get_video_buffer = ff_null_get_video_buffer,

  882.                                     .start_frame      = start_frame,

  883.                                     .draw_slice       = null_draw_slice,

  884.                                     .end_frame        = end_frame,

  885.                                     .config_props     = config_input,

  886.                                     .min_perms        = AV_PERM_WRITE |

  887.                                                         AV_PERM_READ,

  888.                                     .rej_perms        = AV_PERM_PRESERVE },

  889.                                   { .name = NULL}},

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

  891.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  892.                                   { .name = NULL}},

  893. };