falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31701 Commits
32 Branches
511MB
Tree: 4556ebfb7d
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '4556ebfb7d'
${ noResults }
FFmpeg/libavfilter/vf_drawtext.c

882 lines
32KB
Raw Blame History 

  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. 

  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. 

  52. static const char *var_names[] = {

  53.     "E",

  54.     "PHI",

  55.     "PI",

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

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

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

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

  60.     "x",

  61.     "y",

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

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

  64.     NULL

  65. };

  66. 

  67. static const char *fun2_names[] = {

  68.     "rand",

  69. };

  70. 

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

  72. {

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

  74. }

  75. 

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

  77. 

  78. static const eval_func2 fun2[] = {

  79.     drand,

  80.     NULL

  81. };

  82. 

  83. enum var_name {

  84.     VAR_E,

  85.     VAR_PHI,

  86.     VAR_PI,

  87.     VAR_MAIN_W, VAR_MW,

  88.     VAR_MAIN_H, VAR_MH,

  89.     VAR_TEXT_W, VAR_TW,

  90.     VAR_TEXT_H, VAR_TH,

  91.     VAR_X,

  92.     VAR_Y,

  93.     VAR_N,

  94.     VAR_T,

  95.     VAR_VARS_NB

  96. };

  97. 

  98. typedef struct {

  99.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

  110.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  121. 

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

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

  124.     int tabsize;                    ///< tab size

  125. 

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

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

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

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

  130.     int is_packed_rgb;

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

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

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

  134.     char   *x_expr, *y_expr;

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

  136.     double var_values[VAR_VARS_NB];

  137.     char   *d_expr;

  138.     AVExpr *d_pexpr;

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

  140.     AVLFG  prng;                    ///< random

  141. } DrawTextContext;

  142. 

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

  144. 

  145. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  160. 

  161. /* FT_LOAD_* flags */

  162. {"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" },

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

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

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

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

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

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

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

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

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

  172. {"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" },

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

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

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

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

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

  178. {NULL},

  179. };

  180. 

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

  182. {

  183.     return "drawtext";

  184. }

  185. 

  186. static const AVClass drawtext_class = {

  187.     "DrawTextContext",

  188.     drawtext_get_name,

  189.     drawtext_options

  190. };

  191. 

  192. #undef __FTERRORS_H__

  193. #define FT_ERROR_START_LIST {

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

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

  196. 

  197. struct ft_error

  198. {

  199.     int err;

  200.     const char *err_msg;

  201. } static ft_errors[] =

  202. #include FT_ERRORS_H

  203. 

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

  205. 

  206. typedef struct {

  207.     FT_Glyph *glyph;

  208.     uint32_t code;

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

  210.     FT_BBox bbox;

  211.     int advance;

  212.     int bitmap_left;

  213.     int bitmap_top;

  214. } Glyph;

  215. 

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

  217. {

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

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

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

  221. }

  222. 

  223. /**

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

  225.  */

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

  227. {

  228.     DrawTextContext *dtext = ctx->priv;

  229.     Glyph *glyph;

  230.     struct AVTreeNode *node = NULL;

  231.     int ret;

  232. 

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

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

  235.         return AVERROR(EINVAL);

  236. 

  237.     /* save glyph */

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

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

  240.         ret = AVERROR(ENOMEM);

  241.         goto error;

  242.     }

  243.     glyph->code  = code;

  244. 

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

  246.         ret = AVERROR(EINVAL);

  247.         goto error;

  248.     }

  249. 

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

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

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

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

  254. 

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

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

  257. 

  258.     /* cache the newly created glyph */

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

  260.         ret = AVERROR(ENOMEM);

  261.         goto error;

  262.     }

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

  264. 

  265.     if (glyph_ptr)

  266.         *glyph_ptr = glyph;

  267.     return 0;

  268. 

  269. error:

  270.     if (glyph)

  271.         av_freep(&glyph->glyph);

  272.     av_freep(&glyph);

  273.     av_freep(&node);

  274.     return ret;

  275. }

  276. 

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

  278. {

  279.     int err;

  280.     DrawTextContext *dtext = ctx->priv;

  281.     Glyph *glyph;

  282. 

  283.     dtext->class = &drawtext_class;

  284.     av_opt_set_defaults(dtext);

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

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

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

  288. 

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

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

  291.         return err;

  292.     }

  293. 

  294.     if (!dtext->fontfile) {

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

  296.         return AVERROR(EINVAL);

  297.     }

  298. 

  299.     if (dtext->textfile) {

  300.         uint8_t *textbuf;

  301.         size_t textbuf_size;

  302. 

  303.         if (dtext->text) {

  304.             av_log(ctx, AV_LOG_ERROR,

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

  306.             return AVERROR(EINVAL);

  307.         }

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

  309.             av_log(ctx, AV_LOG_ERROR,

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

  311.                    dtext->textfile);

  312.             return err;

  313.         }

  314. 

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

  316.             return AVERROR(ENOMEM);

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

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

  319.         av_file_unmap(textbuf, textbuf_size);

  320.     }

  321. 

  322.     if (!dtext->text) {

  323.         av_log(ctx, AV_LOG_ERROR,

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

  325.         return AVERROR(EINVAL);

  326.     }

  327. 

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

  329.         av_log(ctx, AV_LOG_ERROR,

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

  331.         return err;

  332.     }

  333. 

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

  335.         av_log(ctx, AV_LOG_ERROR,

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

  337.         return err;

  338.     }

  339. 

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

  341.         av_log(ctx, AV_LOG_ERROR,

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

  343.         return err;

  344.     }

  345. 

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

  347.         av_log(ctx, AV_LOG_ERROR,

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

  349.         return AVERROR(EINVAL);

  350.     }

  351. 

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

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

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

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

  356.         return AVERROR(EINVAL);

  357.     }

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

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

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

  361.         return AVERROR(EINVAL);

  362.     }

  363. 

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

  365. 

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

  367.     load_glyph(ctx, NULL, 0);

  368. 

  369.     /* set the tabsize in pixels */

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

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

  372.         return err;

  373.     }

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

  375. 

  376. #if !HAVE_LOCALTIME_R

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

  378. #endif

  379. 

  380.     return 0;

  381. }

  382. 

  383. static int query_formats(AVFilterContext *ctx)

  384. {

  385.     static const enum PixelFormat pix_fmts[] = {

  386.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  387.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  388.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  389.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  390.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  391.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  392.         PIX_FMT_NONE

  393.     };

  394. 

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

  396.     return 0;

  397. }

  398. 

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

  400. {

  401.     av_free(elem);

  402.     return 0;

  403. }

  404. 

  405. static av_cold void uninit(AVFilterContext *ctx)

  406. {

  407.     DrawTextContext *dtext = ctx->priv;

  408.     int i;

  409. 

  410.     av_freep(&dtext->fontfile);

  411.     av_freep(&dtext->text);

  412.     av_freep(&dtext->expanded_text);

  413.     av_freep(&dtext->fontcolor_string);

  414.     av_freep(&dtext->boxcolor_string);

  415.     av_freep(&dtext->positions);

  416.     av_freep(&dtext->shadowcolor_string);

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

  418.     av_tree_destroy(dtext->glyphs);

  419.     dtext->glyphs = 0;

  420.     FT_Done_Face(dtext->face);

  421.     FT_Done_FreeType(dtext->library);

  422. 

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

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

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

  426.     }

  427. 

  428. }

  429. 

  430. static inline int is_newline(uint32_t c)

  431. {

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

  433. }

  434. 

  435. static int dtext_prepare_text(AVFilterContext *ctx)

  436. {

  437.     DrawTextContext *dtext = ctx->priv;

  438.     uint32_t code = 0, prev_code = 0;

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

  440.     int text_height, baseline;

  441.     char *text = dtext->text;

  442.     uint8_t *p;

  443.     int str_w = 0, len;

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

  445.     FT_Vector delta;

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

  447.     Glyph dummy = { 0 };

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

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

  450. 

  451. #if HAVE_LOCALTIME_R

  452.     time_t now = time(0);

  453.     struct tm ltime;

  454.     uint8_t *buf = dtext->expanded_text;

  455.     int buf_size = dtext->expanded_text_size;

  456. 

  457.     if (!buf)

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

  459. 

  460.     localtime_r(&now, &ltime);

  461. 

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

  463.         *buf = 1;

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

  465.             break;

  466.         buf_size *= 2;

  467.     }

  468. 

  469.     if (!buf)

  470.         return AVERROR(ENOMEM);

  471.     text = dtext->expanded_text = buf;

  472.     dtext->expanded_text_size = buf_size;

  473. #endif

  474. 

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

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

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

  478.         if (!p) {

  479.             av_freep(dtext->positions);

  480.             dtext->nb_positions = 0;

  481.             return AVERROR(ENOMEM);

  482.         } else {

  483.             dtext->positions = p;

  484.             dtext->nb_positions = len;

  485.         }

  486.     }

  487. 

  488.     /* load and cache glyphs */

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

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

  491. 

  492.         /* get glyph */

  493.         dummy.code = code;

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

  495.         if (!glyph)

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

  497.         if (ret) return ret;

  498. 

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

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

  501.     }

  502.     text_height = y_max - y_min;

  503.     baseline    = y_max;

  504. 

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

  506.     glyph = NULL;

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

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

  509. 

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

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

  512.             continue;

  513. 

  514.         prev_code = code;

  515.         if (is_newline(code)) {

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

  517.             y += text_height;

  518.             x = 0;

  519.             continue;

  520.         }

  521. 

  522.         /* get glyph */

  523.         prev_glyph = glyph;

  524.         dummy.code = code;

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

  526. 

  527.         /* kerning */

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

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

  530.                            ft_kerning_default, &delta);

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

  532.         }

  533. 

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

  535.             str_w = FFMAX(str_w, x);

  536.             y += text_height;

  537.             x = 0;

  538.         }

  539. 

  540.         /* save position */

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

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

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

  544.         else              x += glyph->advance;

  545.     }

  546. 

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

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

  549. 

  550.     dtext->w = str_w;

  551.     dtext->h = y;

  552. 

  553.     return 0;

  554. }

  555. 

  556. 

  557. static int config_input(AVFilterLink *inlink)

  558. {

  559.     AVFilterContext *ctx  = inlink->dst;

  560.     DrawTextContext *dtext = ctx->priv;

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

  562.     int ret;

  563. 

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

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

  566. 

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

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

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

  570. 

  571.     dtext->var_values[VAR_MAIN_W] =

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

  573.     dtext->var_values[VAR_MAIN_H] =

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

  575. 

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

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

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

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

  580. 

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

  582. 

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

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

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

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

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

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

  589.         return AVERROR(EINVAL);

  590. 

  591.     if ((ret =

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

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

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

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

  596.         return ret;

  597. 

  598.     if (!dtext->is_packed_rgb) {

  599.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  604.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  609.     }

  610. 

  611.     dtext->draw = 1;

  612. 

  613.     return dtext_prepare_text(ctx);

  614. }

  615. 

  616. #define GET_BITMAP_VAL(r, c)                                            \

  617.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  620. 

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

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

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

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

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

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

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

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

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

  630.     }\

  631. }

  632. 

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

  634.                                  unsigned int y, unsigned int width, unsigned int height,

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

  636. {

  637.     int r, c, alpha;

  638.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  639.     uint8_t src_val;

  640. 

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

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

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

  644.             src_val = GET_BITMAP_VAL(r, c);

  645.             if (!src_val)

  646.                 continue;

  647. 

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

  649.         }

  650.     }

  651. 

  652.     return 0;

  653. }

  654. 

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

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

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

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

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

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

  661. }

  662. 

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

  664.                                  unsigned int x, unsigned int y,

  665.                                  unsigned int width, unsigned int height, int pixel_step,

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

  667. {

  668.     int r, c, alpha;

  669.     uint8_t *p;

  670.     uint8_t src_val;

  671. 

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

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

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

  675.             src_val = GET_BITMAP_VAL(r, c);

  676.             if (!src_val)

  677.                 continue;

  678. 

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

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

  681.         }

  682.     }

  683. 

  684.     return 0;

  685. }

  686. 

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

  688.                            unsigned int width, unsigned int height,

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

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

  691. {

  692.     int i, j, alpha;

  693. 

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

  695.         if (is_rgba_packed) {

  696.             uint8_t *p;

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

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

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

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

  701.         } else {

  702.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  706.         }

  707.     } else {

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

  709.                           line, pixel_step, hsub, vsub,

  710.                           x, y, width, height);

  711.     }

  712. }

  713. 

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

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

  716. {

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

  718.     uint32_t code = 0;

  719.     int i;

  720.     uint8_t *p;

  721.     Glyph *glyph = NULL;

  722. 

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

  724.         Glyph dummy = { 0 };

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

  726. 

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

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

  729.             continue;

  730. 

  731.         dummy.code = code;

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

  733. 

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

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

  736.             return AVERROR(EINVAL);

  737. 

  738.         if (dtext->is_packed_rgb) {

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

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

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

  742.         } else {

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

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

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

  746.         }

  747.     }

  748. 

  749.     return 0;

  750. }

  751. 

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

  753.                      int width, int height)

  754. {

  755.     DrawTextContext *dtext = ctx->priv;

  756.     int ret;

  757. 

  758.     /* draw box */

  759.     if (dtext->draw_box)

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

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

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

  763.                 dtext->rgba_map);

  764. 

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

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

  767.                                dtext->shadowcolor_rgba,

  768.                                dtext->shadowcolor,

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

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

  771.             return ret;

  772.     }

  773. 

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

  775.                            dtext->fontcolor_rgba,

  776.                            dtext->fontcolor,

  777.                            dtext->x,

  778.                            dtext->y)) < 0)

  779.         return ret;

  780. 

  781.     return 0;

  782. }

  783. 

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

  785. 

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

  787. {

  788.     int ret = 0;

  789. 

  790.     if (isnan(d)) {

  791.         ret = AVERROR(EINVAL);

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

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

  794.         ret = AVERROR(EINVAL);

  795.     } else

  796.         *n = round(d);

  797. 

  798.     return ret;

  799. }

  800. 

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

  802. {

  803.     AVFilterContext *ctx = inlink->dst;

  804.     DrawTextContext *dtext = ctx->priv;

  805.     int fail = 0;

  806. 

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

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

  809.         fail = 1;

  810.     }

  811. 

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

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

  814.     dtext->var_values[VAR_X] =

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

  816.     dtext->var_values[VAR_Y] =

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

  818.     dtext->var_values[VAR_X] =

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

  820. 

  821.     dtext->draw = fail ? 0 :

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

  823. 

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

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

  826. 

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

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

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

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

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

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

  833. 

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

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

  836. 

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

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

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

  840. 

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

  842. }

  843. 

  844. static void end_frame(AVFilterLink *inlink)

  845. {

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

  847.     AVFilterBufferRef *picref = inlink->cur_buf;

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

  849. 

  850.     if (dtext->draw)

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

  852. 

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

  854. 

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

  856.     avfilter_end_frame(outlink);

  857. }

  858. 

  859. AVFilter avfilter_vf_drawtext = {

  860.     .name          = "drawtext",

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

  862.     .priv_size     = sizeof(DrawTextContext),

  863.     .init          = init,

  864.     .uninit        = uninit,

  865.     .query_formats = query_formats,

  866. 

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

  868.                                     .type             = AVMEDIA_TYPE_VIDEO,

  869.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  870.                                     .start_frame      = start_frame,

  871.                                     .draw_slice       = null_draw_slice,

  872.                                     .end_frame        = end_frame,

  873.                                     .config_props     = config_input,

  874.                                     .min_perms        = AV_PERM_WRITE |

  875.                                                         AV_PERM_READ,

  876.                                     .rej_perms        = AV_PERM_PRESERVE },

  877.                                   { .name = NULL}},

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

  879.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  880.                                   { .name = NULL}},

  881. };