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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/parseutils.h"

  38. #include "libavutil/pixdesc.h"

  39. #include "libavutil/tree.h"

  40. #include "avfilter.h"

  41. #include "drawutils.h"

  42. 

  43. #undef time

  44. 

  45. #include <ft2build.h>

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

  47. #include FT_FREETYPE_H

  48. #include FT_GLYPH_H

  49. 

  50. static const char *var_names[] = {

  51.     "E",

  52.     "PHI",

  53.     "PI",

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

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

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

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

  58.     "x",

  59.     "y",

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

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

  62.     NULL

  63. };

  64. 

  65. enum var_name {

  66.     VAR_E,

  67.     VAR_PHI,

  68.     VAR_PI,

  69.     VAR_MAIN_W, VAR_MW,

  70.     VAR_MAIN_H, VAR_MH,

  71.     VAR_TEXT_W, VAR_TW,

  72.     VAR_TEXT_H, VAR_TH,

  73.     VAR_X,

  74.     VAR_Y,

  75.     VAR_N,

  76.     VAR_T,

  77.     VAR_VARS_NB

  78. };

  79. 

  80. typedef struct {

  81.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

  92.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  103. 

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

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

  106.     int tabsize;                    ///< tab size

  107. 

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

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

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

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

  112.     int is_packed_rgb;

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

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

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

  116.     char   *x_expr, *y_expr;

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

  118.     double var_values[VAR_VARS_NB];

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

  120. } DrawTextContext;

  121. 

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

  123. 

  124. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

  138. 

  139. /* FT_LOAD_* flags */

  140. {"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" },

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

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

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

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

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

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

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

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

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

  150. {"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" },

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

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

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

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

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

  156. {NULL},

  157. };

  158. 

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

  160. {

  161.     return "drawtext";

  162. }

  163. 

  164. static const AVClass drawtext_class = {

  165.     "DrawTextContext",

  166.     drawtext_get_name,

  167.     drawtext_options

  168. };

  169. 

  170. #undef __FTERRORS_H__

  171. #define FT_ERROR_START_LIST {

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

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

  174. 

  175. struct ft_error

  176. {

  177.     int err;

  178.     const char *err_msg;

  179. } static ft_errors[] =

  180. #include FT_ERRORS_H

  181. 

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

  183. 

  184. typedef struct {

  185.     FT_Glyph *glyph;

  186.     uint32_t code;

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

  188.     FT_BBox bbox;

  189.     int advance;

  190.     int bitmap_left;

  191.     int bitmap_top;

  192. } Glyph;

  193. 

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

  195. {

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

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

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

  199. }

  200. 

  201. /**

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

  203.  */

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

  205. {

  206.     DrawTextContext *dtext = ctx->priv;

  207.     Glyph *glyph;

  208.     struct AVTreeNode *node = NULL;

  209.     int ret;

  210. 

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

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

  213.         return AVERROR(EINVAL);

  214. 

  215.     /* save glyph */

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

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

  218.         ret = AVERROR(ENOMEM);

  219.         goto error;

  220.     }

  221.     glyph->code  = code;

  222. 

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

  224.         ret = AVERROR(EINVAL);

  225.         goto error;

  226.     }

  227. 

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

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

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

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

  232. 

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

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

  235. 

  236.     /* cache the newly created glyph */

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

  238.         ret = AVERROR(ENOMEM);

  239.         goto error;

  240.     }

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

  242. 

  243.     if (glyph_ptr)

  244.         *glyph_ptr = glyph;

  245.     return 0;

  246. 

  247. error:

  248.     if (glyph)

  249.         av_freep(&glyph->glyph);

  250.     av_freep(&glyph);

  251.     av_freep(&node);

  252.     return ret;

  253. }

  254. 

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

  256. {

  257.     int err;

  258.     DrawTextContext *dtext = ctx->priv;

  259.     Glyph *glyph;

  260. 

  261.     dtext->class = &drawtext_class;

  262.     av_opt_set_defaults(dtext);

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

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

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

  266. 

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

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

  269.         return err;

  270.     }

  271. 

  272.     if (!dtext->fontfile) {

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

  274.         return AVERROR(EINVAL);

  275.     }

  276. 

  277.     if (dtext->textfile) {

  278.         uint8_t *textbuf;

  279.         size_t textbuf_size;

  280. 

  281.         if (dtext->text) {

  282.             av_log(ctx, AV_LOG_ERROR,

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

  284.             return AVERROR(EINVAL);

  285.         }

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

  287.             av_log(ctx, AV_LOG_ERROR,

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

  289.                    dtext->textfile);

  290.             return err;

  291.         }

  292. 

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

  294.             return AVERROR(ENOMEM);

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

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

  297.         av_file_unmap(textbuf, textbuf_size);

  298.     }

  299. 

  300.     if (!dtext->text) {

  301.         av_log(ctx, AV_LOG_ERROR,

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

  303.         return AVERROR(EINVAL);

  304.     }

  305. 

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

  307.         av_log(ctx, AV_LOG_ERROR,

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

  309.         return err;

  310.     }

  311. 

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

  313.         av_log(ctx, AV_LOG_ERROR,

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

  315.         return err;

  316.     }

  317. 

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

  319.         av_log(ctx, AV_LOG_ERROR,

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

  321.         return err;

  322.     }

  323. 

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

  325.         av_log(ctx, AV_LOG_ERROR,

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

  327.         return AVERROR(EINVAL);

  328.     }

  329. 

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

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

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

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

  334.         return AVERROR(EINVAL);

  335.     }

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

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

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

  339.         return AVERROR(EINVAL);

  340.     }

  341. 

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

  343. 

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

  345.     load_glyph(ctx, NULL, 0);

  346. 

  347.     /* set the tabsize in pixels */

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

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

  350.         return err;

  351.     }

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

  353. 

  354. #if !HAVE_LOCALTIME_R

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

  356. #endif

  357. 

  358.     return 0;

  359. }

  360. 

  361. static int query_formats(AVFilterContext *ctx)

  362. {

  363.     static const enum PixelFormat pix_fmts[] = {

  364.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  365.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  366.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  367.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  368.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  369.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  370.         PIX_FMT_NONE

  371.     };

  372. 

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

  374.     return 0;

  375. }

  376. 

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

  378. {

  379.     av_free(elem);

  380.     return 0;

  381. }

  382. 

  383. static av_cold void uninit(AVFilterContext *ctx)

  384. {

  385.     DrawTextContext *dtext = ctx->priv;

  386.     int i;

  387. 

  388.     av_freep(&dtext->fontfile);

  389.     av_freep(&dtext->text);

  390.     av_freep(&dtext->expanded_text);

  391.     av_freep(&dtext->fontcolor_string);

  392.     av_freep(&dtext->boxcolor_string);

  393.     av_freep(&dtext->positions);

  394.     av_freep(&dtext->shadowcolor_string);

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

  396.     av_tree_destroy(dtext->glyphs);

  397.     dtext->glyphs = 0;

  398.     FT_Done_Face(dtext->face);

  399.     FT_Done_FreeType(dtext->library);

  400. 

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

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

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

  404.     }

  405. 

  406. }

  407. 

  408. static inline int is_newline(uint32_t c)

  409. {

  410.     return (c == '\n' || c == '\r' || c == '\f' || c == '\v');

  411. }

  412. 

  413. static int dtext_prepare_text(AVFilterContext *ctx)

  414. {

  415.     DrawTextContext *dtext = ctx->priv;

  416.     uint32_t code = 0, prev_code = 0;

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

  418.     int text_height, baseline;

  419.     char *text = dtext->text;

  420.     uint8_t *p;

  421.     int str_w = 0, len;

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

  423.     FT_Vector delta;

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

  425.     Glyph dummy = { 0 };

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

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

  428. 

  429. #if HAVE_LOCALTIME_R

  430.     time_t now = time(0);

  431.     struct tm ltime;

  432.     uint8_t *buf = dtext->expanded_text;

  433.     int buf_size = dtext->expanded_text_size;

  434. 

  435.     if (!buf)

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

  437. 

  438.     localtime_r(&now, &ltime);

  439. 

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

  441.         *buf = 1;

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

  443.             break;

  444.         buf_size *= 2;

  445.     }

  446. 

  447.     if (!buf)

  448.         return AVERROR(ENOMEM);

  449.     text = dtext->expanded_text = buf;

  450.     dtext->expanded_text_size = buf_size;

  451. #endif

  452. 

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

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

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

  456.         if (!p) {

  457.             av_freep(dtext->positions);

  458.             dtext->nb_positions = 0;

  459.             return AVERROR(ENOMEM);

  460.         } else {

  461.             dtext->positions = p;

  462.             dtext->nb_positions = len;

  463.         }

  464.     }

  465. 

  466.     /* load and cache glyphs */

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

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

  469. 

  470.         /* get glyph */

  471.         dummy.code = code;

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

  473.         if (!glyph)

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

  475.         if (ret) return ret;

  476. 

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

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

  479.     }

  480.     text_height = y_max - y_min;

  481.     baseline    = y_max;

  482. 

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

  484.     glyph = NULL;

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

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

  487. 

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

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

  490.             continue;

  491. 

  492.         prev_code = code;

  493.         if (is_newline(code)) {

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

  495.             y += text_height;

  496.             x = 0;

  497.             continue;

  498.         }

  499. 

  500.         /* get glyph */

  501.         prev_glyph = glyph;

  502.         dummy.code = code;

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

  504. 

  505.         /* kerning */

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

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

  508.                            ft_kerning_default, &delta);

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

  510.         }

  511. 

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

  513.             str_w = FFMAX(str_w, x);

  514.             y += text_height;

  515.             x = 0;

  516.         }

  517. 

  518.         /* save position */

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

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

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

  522.         else              x += glyph->advance;

  523.     }

  524. 

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

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

  527. 

  528.     dtext->w = str_w;

  529.     dtext->h = y;

  530. 

  531.     return 0;

  532. }

  533. 

  534. 

  535. static int config_input(AVFilterLink *inlink)

  536. {

  537.     AVFilterContext *ctx  = inlink->dst;

  538.     DrawTextContext *dtext = ctx->priv;

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

  540.     int ret;

  541. 

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

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

  544. 

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

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

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

  548. 

  549.     dtext->var_values[VAR_MAIN_W] =

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

  551.     dtext->var_values[VAR_MAIN_H] =

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

  553. 

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

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

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

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

  558. 

  559. 

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

  561.                              NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||

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

  563.                              NULL, NULL, NULL, NULL, 0, ctx)) < 0)

  564.         return AVERROR(EINVAL);

  565. 

  566.     if ((ret =

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

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

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

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

  571.         return ret;

  572. 

  573.     if (!dtext->is_packed_rgb) {

  574.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  579.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  584.     }

  585. 

  586.     dtext->draw = 1;

  587. 

  588.     return dtext_prepare_text(ctx);

  589. }

  590. 

  591. #define GET_BITMAP_VAL(r, c)                                            \

  592.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  595. 

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

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

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

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

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

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

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

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

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

  605.     }\

  606. }

  607. 

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

  609.                                  unsigned int y, unsigned int width, unsigned int height,

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

  611. {

  612.     int r, c, alpha;

  613.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  614.     uint8_t src_val;

  615. 

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

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

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

  619.             src_val = GET_BITMAP_VAL(r, c);

  620.             if (!src_val)

  621.                 continue;

  622. 

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

  624.         }

  625.     }

  626. 

  627.     return 0;

  628. }

  629. 

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

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

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

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

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

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

  636. }

  637. 

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

  639.                                  unsigned int x, unsigned int y,

  640.                                  unsigned int width, unsigned int height, int pixel_step,

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

  642. {

  643.     int r, c, alpha;

  644.     uint8_t *p;

  645.     uint8_t src_val;

  646. 

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

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

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

  650.             src_val = GET_BITMAP_VAL(r, c);

  651.             if (!src_val)

  652.                 continue;

  653. 

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

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

  656.         }

  657.     }

  658. 

  659.     return 0;

  660. }

  661. 

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

  663.                            unsigned int width, unsigned int height,

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

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

  666. {

  667.     int i, j, alpha;

  668. 

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

  670.         if (is_rgba_packed) {

  671.             uint8_t *p;

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

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

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

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

  676.         } else {

  677.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  681.         }

  682.     } else {

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

  684.                           line, pixel_step, hsub, vsub,

  685.                           x, y, width, height);

  686.     }

  687. }

  688. 

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

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

  691. {

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

  693.     uint32_t code = 0;

  694.     int i;

  695.     uint8_t *p;

  696.     Glyph *glyph = NULL;

  697. 

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

  699.         Glyph dummy = { 0 };

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

  701. 

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

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

  704.             continue;

  705. 

  706.         dummy.code = code;

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

  708. 

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

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

  711.             return AVERROR(EINVAL);

  712. 

  713.         if (dtext->is_packed_rgb) {

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

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

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

  717.         } else {

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

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

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

  721.         }

  722.     }

  723. 

  724.     return 0;

  725. }

  726. 

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

  728.                      int width, int height)

  729. {

  730.     DrawTextContext *dtext = ctx->priv;

  731.     int ret;

  732. 

  733.     /* draw box */

  734.     if (dtext->draw_box)

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

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

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

  738.                 dtext->rgba_map);

  739. 

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

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

  742.                                dtext->shadowcolor_rgba,

  743.                                dtext->shadowcolor,

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

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

  746.             return ret;

  747.     }

  748. 

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

  750.                            dtext->fontcolor_rgba,

  751.                            dtext->fontcolor,

  752.                            dtext->x,

  753.                            dtext->y)) < 0)

  754.         return ret;

  755. 

  756.     return 0;

  757. }

  758. 

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

  760. 

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

  762. {

  763.     int ret = 0;

  764. 

  765.     if (isnan(d)) {

  766.         ret = AVERROR(EINVAL);

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

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

  769.         ret = AVERROR(EINVAL);

  770.     } else

  771.         *n = round(d);

  772. 

  773.     return ret;

  774. }

  775. 

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

  777. {

  778.     AVFilterContext *ctx = inlink->dst;

  779.     DrawTextContext *dtext = ctx->priv;

  780. 

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

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

  783.         dtext->draw = 0;

  784.     }

  785. 

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

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

  788.     dtext->var_values[VAR_X] =

  789.         av_expr_eval(dtext->x_pexpr, dtext->var_values, NULL);

  790.     dtext->var_values[VAR_Y] =

  791.         av_expr_eval(dtext->y_pexpr, dtext->var_values, NULL);

  792.     dtext->var_values[VAR_X] =

  793.         av_expr_eval(dtext->x_pexpr, dtext->var_values, NULL);

  794. 

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

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

  797. 

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

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

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

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

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

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

  804. 

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

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

  807. 

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

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

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

  811. 

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

  813. }

  814. 

  815. static void end_frame(AVFilterLink *inlink)

  816. {

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

  818.     AVFilterBufferRef *picref = inlink->cur_buf;

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

  820. 

  821.     if (dtext->draw)

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

  823. 

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

  825. 

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

  827.     avfilter_end_frame(outlink);

  828. }

  829. 

  830. AVFilter avfilter_vf_drawtext = {

  831.     .name          = "drawtext",

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

  833.     .priv_size     = sizeof(DrawTextContext),

  834.     .init          = init,

  835.     .uninit        = uninit,

  836.     .query_formats = query_formats,

  837. 

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

  839.                                     .type             = AVMEDIA_TYPE_VIDEO,

  840.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  841.                                     .start_frame      = start_frame,

  842.                                     .draw_slice       = null_draw_slice,

  843.                                     .end_frame        = end_frame,

  844.                                     .config_props     = config_input,

  845.                                     .min_perms        = AV_PERM_WRITE |

  846.                                                         AV_PERM_READ,

  847.                                     .rej_perms        = AV_PERM_PRESERVE },

  848.                                   { .name = NULL}},

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

  850.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  851.                                   { .name = NULL}},

  852. };