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FFmpeg/libavfilter/vf_drawtext.c

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  1. /*

  2.  * Copyright (c) 2011 Stefano Sabatini

  3.  * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram

  4.  * Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>

  5.  *

  6.  * This file is part of FFmpeg.

  7.  *

  8.  * FFmpeg is free software; you can redistribute it and/or

  9.  * modify it under the terms of the GNU Lesser General Public

  10.  * License as published by the Free Software Foundation; either

  11.  * version 2.1 of the License, or (at your option) any later version.

  12.  *

  13.  * FFmpeg is distributed in the hope that it will be useful,

  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  * Lesser General Public License for more details.

  17.  *

  18.  * You should have received a copy of the GNU Lesser General Public

  19.  * License along with FFmpeg; if not, write to the Free Software

  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  21.  */

  22. 

  23. /**

  24.  * @file

  25.  * drawtext filter, based on the original vhook/drawtext.c

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include <sys/time.h>

  30. #include <time.h>

  31. 

  32. #include "libavcodec/timecode.h"

  33. #include "libavutil/avstring.h"

  34. #include "libavutil/colorspace.h"

  35. #include "libavutil/file.h"

  36. #include "libavutil/eval.h"

  37. #include "libavutil/opt.h"

  38. #include "libavutil/random_seed.h"

  39. #include "libavutil/parseutils.h"

  40. #include "libavutil/pixdesc.h"

  41. #include "libavutil/tree.h"

  42. #include "libavutil/lfg.h"

  43. #include "avfilter.h"

  44. #include "drawutils.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.     "main_w", "w", "W",       ///< width  of the input video

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

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

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

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

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

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

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

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

  63.     "sar",

  64.     "dar",

  65.     "hsub",

  66.     "vsub",

  67.     "x",

  68.     "y",

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

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

  71.     NULL

  72. };

  73. 

  74. static const char *fun2_names[] = {

  75.     "rand",

  76. };

  77. 

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

  79. {

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

  81. }

  82. 

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

  84. 

  85. static const eval_func2 fun2[] = {

  86.     drand,

  87.     NULL

  88. };

  89. 

  90. enum var_name {

  91.     VAR_MAIN_W, VAR_w, VAR_W,

  92.     VAR_MAIN_H, VAR_h, VAR_H,

  93.     VAR_TW, VAR_TEXT_W,

  94.     VAR_TH, VAR_TEXT_H,

  95.     VAR_MAX_GLYPH_W,

  96.     VAR_MAX_GLYPH_H,

  97.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  98.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  99.     VAR_LINE_H, VAR_LH,

  100.     VAR_SAR,

  101.     VAR_DAR,

  102.     VAR_HSUB,

  103.     VAR_VSUB,

  104.     VAR_X,

  105.     VAR_Y,

  106.     VAR_N,

  107.     VAR_T,

  108.     VAR_VARS_NB

  109. };

  110. 

  111. typedef struct {

  112.     const AVClass *class;

  113.     int reinit;                     ///< tells if the filter is being reinited

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

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

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

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

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

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

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

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

  122.     int x;                          ///< x position to start drawing text

  123.     int y;                          ///< y position to start drawing text

  124.     int max_glyph_w;                ///< max glyph width

  125.     int max_glyph_h;                ///< max glyph heigth

  126.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  137. 

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

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

  140.     int tabsize;                    ///< tab size

  141. 

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

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

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

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

  146.     int is_packed_rgb;

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

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

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

  150.     char *x_expr;                   ///< expression for x position

  151.     char *y_expr;                   ///< expression for y position

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

  153.     int64_t basetime;               ///< base pts time in the real world for display

  154.     double var_values[VAR_VARS_NB];

  155.     char   *d_expr;

  156.     AVExpr *d_pexpr;

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

  158.     AVLFG  prng;                    ///< random

  159.     struct ff_timecode tc;

  160.     int frame_id;

  161. } DrawTextContext;

  162. 

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

  164. 

  165. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

  179. {"basetime", "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.dbl=AV_NOPTS_VALUE},     INT64_MIN,        INT64_MAX  },

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

  181. {"timecode", "set initial timecode", OFFSET(tc.str),             AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  182. {"r",        "set rate (timecode only)", OFFSET(tc.rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },

  183. {"rate",     "set rate (timecode only)", OFFSET(tc.rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },

  184. 

  185. /* FT_LOAD_* flags */

  186. {"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" },

  187. {"default",                     "set default",                     0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  188. {"no_scale",                    "set no_scale",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  189. {"no_hinting",                  "set no_hinting",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  190. {"render",                      "set render",                      0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  191. {"no_bitmap",                   "set no_bitmap",                   0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  192. {"vertical_layout",             "set vertical_layout",             0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  193. {"force_autohint",              "set force_autohint",              0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  194. {"crop_bitmap",                 "set crop_bitmap",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  195. {"pedantic",                    "set pedantic",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  196. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  197. {"no_recurse",                  "set no_recurse",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  198. {"ignore_transform",            "set ignore_transform",            0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  199. {"monochrome",                  "set monochrome",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  200. {"linear_design",               "set linear_design",               0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  201. {"no_autohint",                 "set no_autohint",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  202. {NULL},

  203. };

  204. 

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

  206. {

  207.     return "drawtext";

  208. }

  209. 

  210. static const AVClass drawtext_class = {

  211.     "DrawTextContext",

  212.     drawtext_get_name,

  213.     drawtext_options

  214. };

  215. 

  216. #undef __FTERRORS_H__

  217. #define FT_ERROR_START_LIST {

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

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

  220. 

  221. struct ft_error

  222. {

  223.     int err;

  224.     const char *err_msg;

  225. } static ft_errors[] =

  226. #include FT_ERRORS_H

  227. 

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

  229. 

  230. typedef struct {

  231.     FT_Glyph *glyph;

  232.     uint32_t code;

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

  234.     FT_BBox bbox;

  235.     int advance;

  236.     int bitmap_left;

  237.     int bitmap_top;

  238. } Glyph;

  239. 

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

  241. {

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

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

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

  245. }

  246. 

  247. /**

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

  249.  */

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

  251. {

  252.     DrawTextContext *dtext = ctx->priv;

  253.     Glyph *glyph;

  254.     struct AVTreeNode *node = NULL;

  255.     int ret;

  256. 

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

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

  259.         return AVERROR(EINVAL);

  260. 

  261.     /* save glyph */

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

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

  264.         ret = AVERROR(ENOMEM);

  265.         goto error;

  266.     }

  267.     glyph->code  = code;

  268. 

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

  270.         ret = AVERROR(EINVAL);

  271.         goto error;

  272.     }

  273. 

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

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

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

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

  278. 

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

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

  281. 

  282.     /* cache the newly created glyph */

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

  284.         ret = AVERROR(ENOMEM);

  285.         goto error;

  286.     }

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

  288. 

  289.     if (glyph_ptr)

  290.         *glyph_ptr = glyph;

  291.     return 0;

  292. 

  293. error:

  294.     if (glyph)

  295.         av_freep(&glyph->glyph);

  296.     av_freep(&glyph);

  297.     av_freep(&node);

  298.     return ret;

  299. }

  300. 

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

  302. {

  303.     int err;

  304.     DrawTextContext *dtext = ctx->priv;

  305.     Glyph *glyph;

  306. 

  307.     dtext->class = &drawtext_class;

  308.     av_opt_set_defaults(dtext);

  309. 

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

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

  312.         return err;

  313.     }

  314. 

  315.     if (!dtext->fontfile) {

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

  317.         return AVERROR(EINVAL);

  318.     }

  319. 

  320.     if (dtext->textfile) {

  321.         uint8_t *textbuf;

  322.         size_t textbuf_size;

  323. 

  324.         if (dtext->text) {

  325.             av_log(ctx, AV_LOG_ERROR,

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

  327.             return AVERROR(EINVAL);

  328.         }

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

  330.             av_log(ctx, AV_LOG_ERROR,

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

  332.                    dtext->textfile);

  333.             return err;

  334.         }

  335. 

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

  337.             return AVERROR(ENOMEM);

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

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

  340.         av_file_unmap(textbuf, textbuf_size);

  341.     }

  342. 

  343.     if (dtext->tc.str) {

  344.         if (avpriv_init_smpte_timecode(ctx, &dtext->tc) < 0)

  345.             return AVERROR(EINVAL);

  346.         if (!dtext->text)

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

  348.     }

  349. 

  350.     if (!dtext->text) {

  351.         av_log(ctx, AV_LOG_ERROR,

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

  353.         return AVERROR(EINVAL);

  354.     }

  355. 

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

  357.         av_log(ctx, AV_LOG_ERROR,

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

  359.         return err;

  360.     }

  361. 

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

  363.         av_log(ctx, AV_LOG_ERROR,

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

  365.         return err;

  366.     }

  367. 

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

  369.         av_log(ctx, AV_LOG_ERROR,

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

  371.         return err;

  372.     }

  373. 

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

  375.         av_log(ctx, AV_LOG_ERROR,

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

  377.         return AVERROR(EINVAL);

  378.     }

  379. 

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

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

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

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

  384.         return AVERROR(EINVAL);

  385.     }

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

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

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

  389.         return AVERROR(EINVAL);

  390.     }

  391. 

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

  393. 

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

  395.     load_glyph(ctx, NULL, 0);

  396. 

  397.     /* set the tabsize in pixels */

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

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

  400.         return err;

  401.     }

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

  403. 

  404.     return 0;

  405. }

  406. 

  407. static int query_formats(AVFilterContext *ctx)

  408. {

  409.     static const enum PixelFormat pix_fmts[] = {

  410.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  411.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  412.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  413.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  414.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  415.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  416.         PIX_FMT_NONE

  417.     };

  418. 

  419.     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

  420.     return 0;

  421. }

  422. 

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

  424. {

  425.     av_free(elem);

  426.     return 0;

  427. }

  428. 

  429. static av_cold void uninit(AVFilterContext *ctx)

  430. {

  431.     DrawTextContext *dtext = ctx->priv;

  432.     int i;

  433. 

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

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

  436. 

  437.     av_freep(&dtext->boxcolor_string);

  438.     av_freep(&dtext->expanded_text);

  439.     av_freep(&dtext->fontcolor_string);

  440.     av_freep(&dtext->fontfile);

  441.     av_freep(&dtext->shadowcolor_string);

  442.     av_freep(&dtext->text);

  443.     av_freep(&dtext->x_expr);

  444.     av_freep(&dtext->y_expr);

  445. 

  446.     av_freep(&dtext->positions);

  447.     dtext->nb_positions = 0;

  448. 

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

  450.     av_tree_destroy(dtext->glyphs);

  451.     dtext->glyphs = NULL;

  452. 

  453.     FT_Done_Face(dtext->face);

  454.     FT_Done_FreeType(dtext->library);

  455. 

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

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

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

  459.     }

  460. }

  461. 

  462. static inline int is_newline(uint32_t c)

  463. {

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

  465. }

  466. 

  467. static int config_input(AVFilterLink *inlink)

  468. {

  469.     AVFilterContext *ctx = inlink->dst;

  470.     DrawTextContext *dtext = ctx->priv;

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

  472.     int ret;

  473. 

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

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

  476. 

  477.     if ((ret =

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

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

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

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

  482.         return ret;

  483. 

  484.     if (!dtext->is_packed_rgb) {

  485.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  490.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  495.     }

  496. 

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

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

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

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

  501.     dtext->var_values[VAR_HSUB]  = 1<<pix_desc->log2_chroma_w;

  502.     dtext->var_values[VAR_VSUB]  = 1<<pix_desc->log2_chroma_h;

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

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

  505.     if (!dtext->reinit)

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

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

  508. 

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

  510. 

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

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

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

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

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

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

  517. 

  518.         return AVERROR(EINVAL);

  519. 

  520.     return 0;

  521. }

  522. 

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

  524. {

  525.     DrawTextContext *dtext = ctx->priv;

  526. 

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

  528.         int ret;

  529.         uninit(ctx);

  530.         dtext->reinit = 1;

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

  532.             return ret;

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

  534.     }

  535. 

  536.     return AVERROR(ENOSYS);

  537. }

  538. 

  539. #define GET_BITMAP_VAL(r, c)                                            \

  540.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  543. 

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

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

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

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

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

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

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

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

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

  553.     }\

  554. }

  555. 

  556. static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,

  557.                                  int x, int y, int width, int height,

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

  559. {

  560.     int r, c, alpha;

  561.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  562.     uint8_t src_val;

  563. 

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

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

  566.             if (c+x < 0 || r+y < 0)

  567.                 continue;

  568. 

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

  570.             src_val = GET_BITMAP_VAL(r, c);

  571.             if (!src_val)

  572.                 continue;

  573. 

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

  575.         }

  576.     }

  577. 

  578.     return 0;

  579. }

  580. 

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

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

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

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

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

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

  587. }

  588. 

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

  590.                                  int x, int y, int width, int height, int pixel_step,

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

  592. {

  593.     int r, c, alpha;

  594.     uint8_t *p;

  595.     uint8_t src_val;

  596. 

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

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

  599.             if (c+x < 0 || r+y < 0)

  600.                 continue;

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

  602.             src_val = GET_BITMAP_VAL(r, c);

  603.             if (!src_val)

  604.                 continue;

  605. 

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

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

  608.         }

  609.     }

  610. 

  611.     return 0;

  612. }

  613. 

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

  615.                            int width, int height,

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

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

  618. {

  619.     int i, j, alpha;

  620. 

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

  622.         if (is_rgba_packed) {

  623.             uint8_t *p;

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

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

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

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

  628.         } else {

  629.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  633.         }

  634.     } else {

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

  636.                           line, pixel_step, hsub, vsub,

  637.                           x, y, width, height);

  638.     }

  639. }

  640. 

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

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

  643. {

  644.     char *text = dtext->expanded_text;

  645.     uint32_t code = 0;

  646.     int i, x1, y1;

  647.     uint8_t *p;

  648.     Glyph *glyph = NULL;

  649. 

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

  651.         Glyph dummy = { 0 };

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

  653. 

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

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

  656.             continue;

  657. 

  658.         dummy.code = code;

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

  660. 

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

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

  663.             return AVERROR(EINVAL);

  664. 

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

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

  667. 

  668.         if (dtext->is_packed_rgb) {

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

  670.                            x1, y1, width, height,

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

  672.         } else {

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

  674.                            x1, y1, width, height,

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

  676.         }

  677.     }

  678. 

  679.     return 0;

  680. }

  681. 

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

  683.                      int width, int height)

  684. {

  685.     DrawTextContext *dtext = ctx->priv;

  686.     uint32_t code = 0, prev_code = 0;

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

  688.     int max_text_line_w = 0, len;

  689.     int box_w, box_h;

  690.     char *text = dtext->text;

  691.     uint8_t *p;

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

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

  694.     FT_Vector delta;

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

  696.     Glyph dummy = { 0 };

  697. 

  698.     time_t now = time(0);

  699.     struct tm ltime;

  700.     uint8_t *buf = dtext->expanded_text;

  701.     int buf_size = dtext->expanded_text_size;

  702. 

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

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

  705. 

  706.     if (!buf) {

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

  708.         buf = av_malloc(buf_size);

  709.     }

  710. 

  711. #if HAVE_LOCALTIME_R

  712.     localtime_r(&now, &ltime);

  713. #else

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

  715.         ltime= *localtime(&now);

  716. #endif

  717. 

  718.     do {

  719.         *buf = 1;

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

  721.             break;

  722.         buf_size *= 2;

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

  724. 

  725.     if (dtext->tc.str) {

  726.         char tcbuf[sizeof("hh:mm:ss.ff")];

  727.         avpriv_timecode_to_string(tcbuf, &dtext->tc, dtext->frame_id++);

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

  729.     }

  730. 

  731.     if (!buf)

  732.         return AVERROR(ENOMEM);

  733.     text = dtext->expanded_text = buf;

  734.     dtext->expanded_text_size = buf_size;

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

  736.         if (!(dtext->positions =

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

  738.             return AVERROR(ENOMEM);

  739.         dtext->nb_positions = len;

  740.     }

  741. 

  742.     x = 0;

  743.     y = 0;

  744. 

  745.     /* load and cache glyphs */

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

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

  748. 

  749.         /* get glyph */

  750.         dummy.code = code;

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

  752.         if (!glyph)

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

  754. 

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

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

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

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

  759.     }

  760.     dtext->max_glyph_h = y_max - y_min;

  761.     dtext->max_glyph_w = x_max - x_min;

  762. 

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

  764.     glyph = NULL;

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

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

  767. 

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

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

  770.             continue;

  771. 

  772.         prev_code = code;

  773.         if (is_newline(code)) {

  774.             max_text_line_w = FFMAX(max_text_line_w, x);

  775.             y += dtext->max_glyph_h;

  776.             x = 0;

  777.             continue;

  778.         }

  779. 

  780.         /* get glyph */

  781.         prev_glyph = glyph;

  782.         dummy.code = code;

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

  784. 

  785.         /* kerning */

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

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

  788.                            ft_kerning_default, &delta);

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

  790.         }

  791. 

  792.         /* save position */

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

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

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

  796.         else              x += glyph->advance;

  797.     }

  798. 

  799.     max_text_line_w = FFMAX(x, max_text_line_w);

  800. 

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

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

  803. 

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

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

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

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

  808. 

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

  810. 

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

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

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

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

  815. 

  816.     if(!dtext->draw)

  817.         return 0;

  818. 

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

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

  821. 

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

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

  824. 

  825.     /* draw box */

  826.     if (dtext->draw_box)

  827.         drawbox(picref, dtext->x, dtext->y, box_w, box_h,

  828.                 dtext->box_line, dtext->pixel_step, dtext->boxcolor_rgba,

  829.                 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);

  830. 

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

  832.         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,

  833.                                dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)

  834.             return ret;

  835.     }

  836. 

  837.     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,

  838.                            dtext->fontcolor, 0, 0)) < 0)

  839.         return ret;

  840. 

  841.     return 0;

  842. }

  843. 

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

  845. 

  846. static void end_frame(AVFilterLink *inlink)

  847. {

  848.     AVFilterContext *ctx = inlink->dst;

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

  850.     DrawTextContext *dtext = ctx->priv;

  851.     AVFilterBufferRef *picref = inlink->cur_buf;

  852. 

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

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

  855. 

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

  857. 

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

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

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

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

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

  878.                                     .type             = AVMEDIA_TYPE_VIDEO,

  879.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  880.                                     .start_frame      = avfilter_null_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   = (const AVFilterPad[]) {{ .name       = "default",

  889.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  890.                                   { .name = NULL}},

  891.     .process_command = command,

  892. };