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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 "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. 

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

  54.     "E",

  55.     "PHI",

  56.     "PI",

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

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

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

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

  61.     "x",

  62.     "y",

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

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

  65.     NULL

  66. };

  67. 

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

  69.     "rand"

  70. };

  71. 

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

  73. {

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

  75. }

  76. 

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

  78. 

  79. static const eval_func2 fun2[] = {

  80.     drand,

  81.     NULL

  82. };

  83. 

  84. enum var_name {

  85.     VAR_E,

  86.     VAR_PHI,

  87.     VAR_PI,

  88.     VAR_MAIN_W, VAR_MW,

  89.     VAR_MAIN_H, VAR_MH,

  90.     VAR_TEXT_W, VAR_TW,

  91.     VAR_TEXT_H, VAR_TH,

  92.     VAR_X,

  93.     VAR_Y,

  94.     VAR_N,

  95.     VAR_T,

  96.     VAR_VARS_NB

  97. };

  98. 

  99. typedef struct {

  100.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

  111.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  122. 

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

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

  125.     int tabsize;                    ///< tab size

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

  127. 

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

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

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

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

  132.     int is_packed_rgb;

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

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

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

  136.     char   *x_expr, *y_expr;

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

  138.     double var_values[VAR_VARS_NB];

  139.     char   *d_expr;

  140.     AVExpr *d_pexpr;

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

  142.     AVLFG  prng;                    ///< random

  143. } DrawTextContext;

  144. 

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

  146. 

  147. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  164. 

  165. /* FT_LOAD_* flags */

  166. {"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" },

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

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

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

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

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

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

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

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

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

  176. {"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" },

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

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

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

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

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

  182. {NULL},

  183. };

  184. 

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

  186. {

  187.     return "drawtext";

  188. }

  189. 

  190. static const AVClass drawtext_class = {

  191.     "DrawTextContext",

  192.     drawtext_get_name,

  193.     drawtext_options

  194. };

  195. 

  196. #undef __FTERRORS_H__

  197. #define FT_ERROR_START_LIST {

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

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

  200. 

  201. struct ft_error

  202. {

  203.     int err;

  204.     const char *err_msg;

  205. } static ft_errors[] =

  206. #include FT_ERRORS_H

  207. 

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

  209. 

  210. typedef struct {

  211.     FT_Glyph *glyph;

  212.     uint32_t code;

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

  214.     FT_BBox bbox;

  215.     int advance;

  216.     int bitmap_left;

  217.     int bitmap_top;

  218. } Glyph;

  219. 

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

  221. {

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

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

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

  225. }

  226. 

  227. /**

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

  229.  */

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

  231. {

  232.     DrawTextContext *dtext = ctx->priv;

  233.     Glyph *glyph;

  234.     struct AVTreeNode *node = NULL;

  235.     int ret;

  236. 

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

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

  239.         return AVERROR(EINVAL);

  240. 

  241.     /* save glyph */

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

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

  244.         ret = AVERROR(ENOMEM);

  245.         goto error;

  246.     }

  247.     glyph->code  = code;

  248. 

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

  250.         ret = AVERROR(EINVAL);

  251.         goto error;

  252.     }

  253. 

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

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

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

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

  258. 

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

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

  261. 

  262.     /* cache the newly created glyph */

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

  264.         ret = AVERROR(ENOMEM);

  265.         goto error;

  266.     }

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

  268. 

  269.     if (glyph_ptr)

  270.         *glyph_ptr = glyph;

  271.     return 0;

  272. 

  273. error:

  274.     if (glyph)

  275.         av_freep(&glyph->glyph);

  276.     av_freep(&glyph);

  277.     av_freep(&node);

  278.     return ret;

  279. }

  280. 

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

  282. {

  283.     int err;

  284.     DrawTextContext *dtext = ctx->priv;

  285.     Glyph *glyph;

  286. 

  287.     dtext->class = &drawtext_class;

  288.     av_opt_set_defaults(dtext);

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

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

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

  292. 

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

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

  295.         return err;

  296.     }

  297. 

  298.     if (!dtext->fontfile) {

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

  300.         return AVERROR(EINVAL);

  301.     }

  302. 

  303.     if (dtext->textfile) {

  304.         uint8_t *textbuf;

  305.         size_t textbuf_size;

  306. 

  307.         if (dtext->text) {

  308.             av_log(ctx, AV_LOG_ERROR,

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

  310.             return AVERROR(EINVAL);

  311.         }

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

  313.             av_log(ctx, AV_LOG_ERROR,

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

  315.                    dtext->textfile);

  316.             return err;

  317.         }

  318. 

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

  320.             return AVERROR(ENOMEM);

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

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

  323.         av_file_unmap(textbuf, textbuf_size);

  324.     }

  325. 

  326.     if (!dtext->text) {

  327.         av_log(ctx, AV_LOG_ERROR,

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

  329.         return AVERROR(EINVAL);

  330.     }

  331. 

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

  333.         av_log(ctx, AV_LOG_ERROR,

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

  335.         return err;

  336.     }

  337. 

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

  339.         av_log(ctx, AV_LOG_ERROR,

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

  341.         return err;

  342.     }

  343. 

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

  345.         av_log(ctx, AV_LOG_ERROR,

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

  347.         return err;

  348.     }

  349. 

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

  351.         av_log(ctx, AV_LOG_ERROR,

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

  353.         return AVERROR(EINVAL);

  354.     }

  355. 

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

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

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

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

  360.         return AVERROR(EINVAL);

  361.     }

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

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

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

  365.         return AVERROR(EINVAL);

  366.     }

  367. 

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

  369. 

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

  371.     load_glyph(ctx, NULL, 0);

  372. 

  373.     /* set the tabsize in pixels */

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

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

  376.         return err;

  377.     }

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

  379. 

  380. #if !HAVE_LOCALTIME_R

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

  382. #endif

  383. 

  384.     return 0;

  385. }

  386. 

  387. static int query_formats(AVFilterContext *ctx)

  388. {

  389.     static const enum PixelFormat pix_fmts[] = {

  390.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  391.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  392.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  393.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  394.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  395.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  396.         PIX_FMT_NONE

  397.     };

  398. 

  399.     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));

  400.     return 0;

  401. }

  402. 

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

  404. {

  405.     av_free(elem);

  406.     return 0;

  407. }

  408. 

  409. static av_cold void uninit(AVFilterContext *ctx)

  410. {

  411.     DrawTextContext *dtext = ctx->priv;

  412.     int i;

  413. 

  414.     av_freep(&dtext->fontfile);

  415.     av_freep(&dtext->text);

  416.     av_freep(&dtext->expanded_text);

  417.     av_freep(&dtext->fontcolor_string);

  418.     av_freep(&dtext->boxcolor_string);

  419.     av_freep(&dtext->positions);

  420.     av_freep(&dtext->shadowcolor_string);

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

  422.     av_tree_destroy(dtext->glyphs);

  423.     dtext->glyphs = 0;

  424.     FT_Done_Face(dtext->face);

  425.     FT_Done_FreeType(dtext->library);

  426. 

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

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

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

  430.     }

  431. 

  432. }

  433. 

  434. static inline int is_newline(uint32_t c)

  435. {

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

  437. }

  438. 

  439. static int dtext_prepare_text(AVFilterContext *ctx)

  440. {

  441.     DrawTextContext *dtext = ctx->priv;

  442.     uint32_t code = 0, prev_code = 0;

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

  444.     int text_height, baseline;

  445.     char *text = dtext->text;

  446.     uint8_t *p;

  447.     int str_w = 0, len;

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

  449.     FT_Vector delta;

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

  451.     Glyph dummy = { 0 };

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

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

  454. 

  455. #if HAVE_LOCALTIME_R

  456.     time_t now = time(0);

  457.     struct tm ltime;

  458.     uint8_t *buf = dtext->expanded_text;

  459.     int buf_size = dtext->expanded_text_size;

  460. 

  461.     if (!buf)

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

  463. 

  464.     localtime_r(&now, &ltime);

  465. 

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

  467.         *buf = 1;

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

  469.             break;

  470.         buf_size *= 2;

  471.     }

  472. 

  473.     if (!buf)

  474.         return AVERROR(ENOMEM);

  475.     text = dtext->expanded_text = buf;

  476.     dtext->expanded_text_size = buf_size;

  477. #endif

  478. 

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

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

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

  482.         if (!p) {

  483.             av_freep(dtext->positions);

  484.             dtext->nb_positions = 0;

  485.             return AVERROR(ENOMEM);

  486.         } else {

  487.             dtext->positions = p;

  488.             dtext->nb_positions = len;

  489.         }

  490.     }

  491. 

  492.     /* load and cache glyphs */

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

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

  495. 

  496.         /* get glyph */

  497.         dummy.code = code;

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

  499.         if (!glyph) {

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

  501.             if (ret)

  502.                 return ret;

  503.         }

  504. 

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

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

  507.     }

  508.     text_height = y_max - y_min;

  509.     baseline    = y_max;

  510. 

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

  512.     glyph = NULL;

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

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

  515. 

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

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

  518.             continue;

  519. 

  520.         prev_code = code;

  521.         if (is_newline(code)) {

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

  523.             y += text_height;

  524.             x = 0;

  525.             continue;

  526.         }

  527. 

  528.         /* get glyph */

  529.         prev_glyph = glyph;

  530.         dummy.code = code;

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

  532. 

  533.         /* kerning */

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

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

  536.                            ft_kerning_default, &delta);

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

  538.         }

  539. 

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

  541.             str_w = FFMAX(str_w, x);

  542.             y += text_height;

  543.             x = 0;

  544.         }

  545. 

  546.         /* save position */

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

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

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

  550.         else              x += glyph->advance;

  551.     }

  552. 

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

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

  555. 

  556.     dtext->w = str_w;

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

  558.     dtext->h = y;

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

  560. 

  561.     return 0;

  562. }

  563. 

  564. 

  565. static int config_input(AVFilterLink *inlink)

  566. {

  567.     AVFilterContext *ctx  = inlink->dst;

  568.     DrawTextContext *dtext = ctx->priv;

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

  570.     int ret;

  571. 

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

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

  574. 

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

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

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

  578. 

  579.     dtext->var_values[VAR_MAIN_W] =

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

  581.     dtext->var_values[VAR_MAIN_H] =

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

  583. 

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

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

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

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

  588. 

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

  590. 

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

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

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

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

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

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

  597.         return AVERROR(EINVAL);

  598. 

  599.     if ((ret =

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

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

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

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

  604.         return ret;

  605. 

  606.     if (!dtext->is_packed_rgb) {

  607.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  612.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  617.     }

  618. 

  619.     dtext->draw = 1;

  620. 

  621.     return dtext_prepare_text(ctx);

  622. }

  623. 

  624. #define GET_BITMAP_VAL(r, c)                                            \

  625.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  628. 

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

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

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

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

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

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

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

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

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

  638.     }\

  639. }

  640. 

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

  642.                                  unsigned int y, unsigned int width, unsigned int height,

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

  644. {

  645.     int r, c, alpha;

  646.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  647.     uint8_t src_val;

  648. 

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

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

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

  652.             src_val = GET_BITMAP_VAL(r, c);

  653.             if (!src_val)

  654.                 continue;

  655. 

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

  657.         }

  658.     }

  659. 

  660.     return 0;

  661. }

  662. 

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

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

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

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

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

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

  669. }

  670. 

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

  672.                                  unsigned int x, unsigned int y,

  673.                                  unsigned int width, unsigned int height, int pixel_step,

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

  675. {

  676.     int r, c, alpha;

  677.     uint8_t *p;

  678.     uint8_t src_val;

  679. 

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

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

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

  683.             src_val = GET_BITMAP_VAL(r, c);

  684.             if (!src_val)

  685.                 continue;

  686. 

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

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

  689.         }

  690.     }

  691. 

  692.     return 0;

  693. }

  694. 

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

  696.                            unsigned int width, unsigned int height,

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

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

  699. {

  700.     int i, j, alpha;

  701. 

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

  703.         if (is_rgba_packed) {

  704.             uint8_t *p;

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

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

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

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

  709.         } else {

  710.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  714.         }

  715.     } else {

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

  717.                           line, pixel_step, hsub, vsub,

  718.                           x, y, width, height);

  719.     }

  720. }

  721. 

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

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

  724. {

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

  726.     uint32_t code = 0;

  727.     int i;

  728.     uint8_t *p;

  729.     Glyph *glyph = NULL;

  730. 

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

  732.         Glyph dummy = { 0 };

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

  734. 

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

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

  737.             continue;

  738. 

  739.         dummy.code = code;

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

  741. 

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

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

  744.             return AVERROR(EINVAL);

  745. 

  746.         if (dtext->is_packed_rgb) {

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

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

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

  750.         } else {

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

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

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

  754.         }

  755.     }

  756. 

  757.     return 0;

  758. }

  759. 

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

  761.                      int width, int height)

  762. {

  763.     DrawTextContext *dtext = ctx->priv;

  764.     int ret;

  765. 

  766.     /* draw box */

  767.     if (dtext->draw_box)

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

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

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

  771.                 dtext->rgba_map);

  772. 

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

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

  775.                                dtext->shadowcolor_rgba,

  776.                                dtext->shadowcolor,

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

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

  779.             return ret;

  780.     }

  781. 

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

  783.                            dtext->fontcolor_rgba,

  784.                            dtext->fontcolor,

  785.                            dtext->x,

  786.                            dtext->y)) < 0)

  787.         return ret;

  788. 

  789.     return 0;

  790. }

  791. 

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

  793. 

  794. static inline int normalize_double(int *n, double d)

  795. {

  796.     int ret = 0;

  797. 

  798.     if (isnan(d)) {

  799.         ret = AVERROR(EINVAL);

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

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

  802.         ret = AVERROR(EINVAL);

  803.     } else

  804.         *n = round(d);

  805. 

  806.     return ret;

  807. }

  808. 

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

  810. {

  811.     AVFilterContext *ctx = inlink->dst;

  812.     DrawTextContext *dtext = ctx->priv;

  813.     int fail = 0;

  814. 

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

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

  817.         fail = 1;

  818.     }

  819. 

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

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

  822.     dtext->var_values[VAR_X] =

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

  824.     dtext->var_values[VAR_Y] =

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

  826.     dtext->var_values[VAR_X] =

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

  828. 

  829.     dtext->draw = fail ? 0 :

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

  831. 

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

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

  834. 

  835.     if (dtext->fix_bounds) {

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

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

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

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

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

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

  842.     }

  843. 

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

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

  846. 

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

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

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

  850. 

  851.     avfilter_start_frame(inlink->dst->outputs[0], inpicref);

  852. }

  853. 

  854. static void end_frame(AVFilterLink *inlink)

  855. {

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

  857.     AVFilterBufferRef *picref = inlink->cur_buf;

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

  859. 

  860.     if (dtext->draw)

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

  862. 

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

  864. 

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

  866.     avfilter_end_frame(outlink);

  867. }

  868. 

  869. AVFilter avfilter_vf_drawtext = {

  870.     .name          = "drawtext",

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

  872.     .priv_size     = sizeof(DrawTextContext),

  873.     .init          = init,

  874.     .uninit        = uninit,

  875.     .query_formats = query_formats,

  876. 

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

  878.                                     .type             = AVMEDIA_TYPE_VIDEO,

  879.                                     .get_video_buffer = ff_null_get_video_buffer,

  880.                                     .start_frame      = start_frame,

  881.                                     .draw_slice       = null_draw_slice,

  882.                                     .end_frame        = end_frame,

  883.                                     .config_props     = config_input,

  884.                                     .min_perms        = AV_PERM_WRITE |

  885.                                                         AV_PERM_READ,

  886.                                     .rej_perms        = AV_PERM_PRESERVE },

  887.                                   { .name = NULL}},

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

  889.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  890.                                   { .name = NULL}},

  891. };