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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/common.h"

  34. #include "libavutil/file.h"

  35. #include "libavutil/eval.h"

  36. #include "libavutil/opt.h"

  37. #include "libavutil/mathematics.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. #include "formats.h"

  46. #include "internal.h"

  47. #include "video.h"

  48. 

  49. #include <ft2build.h>

  50. #include FT_FREETYPE_H

  51. #include FT_GLYPH_H

  52. 

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

  54.     "E",

  55.     "PHI",

  56.     "PI",

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

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

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

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

  61.     "x",

  62.     "y",

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

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

  65.     NULL

  66. };

  67. 

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

  69.     "rand"

  70. };

  71. 

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

  73. {

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

  75. }

  76. 

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

  78. 

  79. static const eval_func2 fun2[] = {

  80.     drand,

  81.     NULL

  82. };

  83. 

  84. enum var_name {

  85.     VAR_E,

  86.     VAR_PHI,

  87.     VAR_PI,

  88.     VAR_MAIN_W, VAR_MW,

  89.     VAR_MAIN_H, VAR_MH,

  90.     VAR_TEXT_W, VAR_TW,

  91.     VAR_TEXT_H, VAR_TH,

  92.     VAR_X,

  93.     VAR_Y,

  94.     VAR_N,

  95.     VAR_T,

  96.     VAR_VARS_NB

  97. };

  98. 

  99. typedef struct {

  100.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

  111.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  122. 

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

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

  125.     int tabsize;                    ///< tab size

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

  127. 

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

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

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

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

  132.     int is_packed_rgb;

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

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

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

  136.     char   *x_expr, *y_expr;

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

  138.     double var_values[VAR_VARS_NB];

  139.     char   *d_expr;

  140.     AVExpr *d_pexpr;

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

  142.     AVLFG  prng;                    ///< random

  143. } DrawTextContext;

  144. 

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

  146. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM

  147. 

  148. static const AVOption drawtext_options[]= {

  149.     { "fontfile",    NULL,                   OFFSET(fontfile),           AV_OPT_TYPE_STRING,                              .flags = FLAGS },

  150.     { "text",        NULL,                   OFFSET(text),               AV_OPT_TYPE_STRING,                              .flags = FLAGS },

  151.     { "textfile",    NULL,                   OFFSET(textfile),           AV_OPT_TYPE_STRING,                              .flags = FLAGS },

  152.     { "fontcolor",   NULL,                   OFFSET(fontcolor_string),   AV_OPT_TYPE_STRING, { .str = "black" },          .flags = FLAGS },

  153.     { "boxcolor",    NULL,                   OFFSET(boxcolor_string),    AV_OPT_TYPE_STRING, { .str = "white" },          .flags = FLAGS },

  154.     { "shadowcolor", NULL,                   OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, { .str = "black" },          .flags = FLAGS },

  155.     { "box",         NULL,                   OFFSET(draw_box),           AV_OPT_TYPE_INT,    { .i64 = 0       }, 0,       1,       FLAGS },

  156.     { "fontsize",    NULL,                   OFFSET(fontsize),           AV_OPT_TYPE_INT,    { .i64 = 16      }, 1,       72,      FLAGS },

  157.     { "x",           NULL,                   OFFSET(x_expr),             AV_OPT_TYPE_STRING, { .str = "0"     },          .flags = FLAGS },

  158.     { "y",           NULL,                   OFFSET(y_expr),             AV_OPT_TYPE_STRING, { .str = "0"     },          .flags = FLAGS },

  159.     { "shadowx",     NULL,                   OFFSET(shadowx),            AV_OPT_TYPE_INT,    { .i64 = 0       }, INT_MIN, INT_MAX, FLAGS },

  160.     { "shadowy",     NULL,                   OFFSET(shadowy),            AV_OPT_TYPE_INT,    { .i64 = 0       }, INT_MIN, INT_MAX, FLAGS },

  161.     { "tabsize",     NULL,                   OFFSET(tabsize),            AV_OPT_TYPE_INT,    { .i64 = 4       }, 0,       INT_MAX, FLAGS },

  162.     { "draw",        "if false do not draw", OFFSET(d_expr),             AV_OPT_TYPE_STRING, { .str = "1"     },          .flags = FLAGS },

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

  164.                                             OFFSET(fix_bounds),          AV_OPT_TYPE_INT,    { .i64 = 1       }, 0,       1,       FLAGS },

  165. 

  166.     /* FT_LOAD_* flags */

  167.     { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT | FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags" },

  168.         { "default",                     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT },                     .flags = FLAGS, .unit = "ft_load_flags" },

  169.         { "no_scale",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE },                    .flags = FLAGS, .unit = "ft_load_flags" },

  170.         { "no_hinting",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING },                  .flags = FLAGS, .unit = "ft_load_flags" },

  171.         { "render",                      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER },                      .flags = FLAGS, .unit = "ft_load_flags" },

  172.         { "no_bitmap",                   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP },                   .flags = FLAGS, .unit = "ft_load_flags" },

  173.         { "vertical_layout",             NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT },             .flags = FLAGS, .unit = "ft_load_flags" },

  174.         { "force_autohint",              NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT },              .flags = FLAGS, .unit = "ft_load_flags" },

  175.         { "crop_bitmap",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP },                 .flags = FLAGS, .unit = "ft_load_flags" },

  176.         { "pedantic",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC },                    .flags = FLAGS, .unit = "ft_load_flags" },

  177.         { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },

  178.         { "no_recurse",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE },                  .flags = FLAGS, .unit = "ft_load_flags" },

  179.         { "ignore_transform",            NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM },            .flags = FLAGS, .unit = "ft_load_flags" },

  180.         { "monochrome",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME },                  .flags = FLAGS, .unit = "ft_load_flags" },

  181.         { "linear_design",               NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN },               .flags = FLAGS, .unit = "ft_load_flags" },

  182.         { "no_autohint",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT },                 .flags = FLAGS, .unit = "ft_load_flags" },

  183.     { NULL},

  184. };

  185. 

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

  187. {

  188.     return "drawtext";

  189. }

  190. 

  191. static const AVClass drawtext_class = {

  192.     "DrawTextContext",

  193.     drawtext_get_name,

  194.     drawtext_options

  195. };

  196. 

  197. #undef __FTERRORS_H__

  198. #define FT_ERROR_START_LIST {

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

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

  201. 

  202. struct ft_error

  203. {

  204.     int err;

  205.     const char *err_msg;

  206. } static ft_errors[] =

  207. #include FT_ERRORS_H

  208. 

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

  210. 

  211. typedef struct {

  212.     FT_Glyph *glyph;

  213.     uint32_t code;

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

  215.     FT_BBox bbox;

  216.     int advance;

  217.     int bitmap_left;

  218.     int bitmap_top;

  219. } Glyph;

  220. 

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

  222. {

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

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

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

  226. }

  227. 

  228. /**

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

  230.  */

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

  232. {

  233.     DrawTextContext *s = ctx->priv;

  234.     Glyph *glyph;

  235.     struct AVTreeNode *node = NULL;

  236.     int ret;

  237. 

  238.     /* load glyph into s->face->glyph */

  239.     if (FT_Load_Char(s->face, code, s->ft_load_flags))

  240.         return AVERROR(EINVAL);

  241. 

  242.     /* save glyph */

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

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

  245.         ret = AVERROR(ENOMEM);

  246.         goto error;

  247.     }

  248.     glyph->code  = code;

  249. 

  250.     if (FT_Get_Glyph(s->face->glyph, glyph->glyph)) {

  251.         ret = AVERROR(EINVAL);

  252.         goto error;

  253.     }

  254. 

  255.     glyph->bitmap      = s->face->glyph->bitmap;

  256.     glyph->bitmap_left = s->face->glyph->bitmap_left;

  257.     glyph->bitmap_top  = s->face->glyph->bitmap_top;

  258.     glyph->advance     = s->face->glyph->advance.x >> 6;

  259. 

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

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

  262. 

  263.     /* cache the newly created glyph */

  264.     if (!(node = av_tree_node_alloc())) {

  265.         ret = AVERROR(ENOMEM);

  266.         goto error;

  267.     }

  268.     av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);

  269. 

  270.     if (glyph_ptr)

  271.         *glyph_ptr = glyph;

  272.     return 0;

  273. 

  274. error:

  275.     if (glyph)

  276.         av_freep(&glyph->glyph);

  277.     av_freep(&glyph);

  278.     av_freep(&node);

  279.     return ret;

  280. }

  281. 

  282. static av_cold int init(AVFilterContext *ctx)

  283. {

  284.     int err;

  285.     DrawTextContext *s = ctx->priv;

  286.     Glyph *glyph;

  287. 

  288.     if (!s->fontfile) {

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

  290.         return AVERROR(EINVAL);

  291.     }

  292. 

  293.     if (s->textfile) {

  294.         uint8_t *textbuf;

  295.         size_t textbuf_size;

  296. 

  297.         if (s->text) {

  298.             av_log(ctx, AV_LOG_ERROR,

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

  300.             return AVERROR(EINVAL);

  301.         }

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

  303.             av_log(ctx, AV_LOG_ERROR,

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

  305.                    s->textfile);

  306.             return err;

  307.         }

  308. 

  309.         if (!(s->text = av_malloc(textbuf_size+1)))

  310.             return AVERROR(ENOMEM);

  311.         memcpy(s->text, textbuf, textbuf_size);

  312.         s->text[textbuf_size] = 0;

  313.         av_file_unmap(textbuf, textbuf_size);

  314.     }

  315. 

  316.     if (!s->text) {

  317.         av_log(ctx, AV_LOG_ERROR,

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

  319.         return AVERROR(EINVAL);

  320.     }

  321. 

  322.     if ((err = av_parse_color(s->fontcolor_rgba, s->fontcolor_string, -1, ctx))) {

  323.         av_log(ctx, AV_LOG_ERROR,

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

  325.         return err;

  326.     }

  327. 

  328.     if ((err = av_parse_color(s->boxcolor_rgba, s->boxcolor_string, -1, ctx))) {

  329.         av_log(ctx, AV_LOG_ERROR,

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

  331.         return err;

  332.     }

  333. 

  334.     if ((err = av_parse_color(s->shadowcolor_rgba, s->shadowcolor_string, -1, ctx))) {

  335.         av_log(ctx, AV_LOG_ERROR,

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

  337.         return err;

  338.     }

  339. 

  340.     if ((err = FT_Init_FreeType(&(s->library)))) {

  341.         av_log(ctx, AV_LOG_ERROR,

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

  343.         return AVERROR(EINVAL);

  344.     }

  345. 

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

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

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

  349.                s->fontfile, FT_ERRMSG(err));

  350.         return AVERROR(EINVAL);

  351.     }

  352.     if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {

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

  354.                s->fontsize, FT_ERRMSG(err));

  355.         return AVERROR(EINVAL);

  356.     }

  357. 

  358.     s->use_kerning = FT_HAS_KERNING(s->face);

  359. 

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

  361.     load_glyph(ctx, NULL, 0);

  362. 

  363.     /* set the tabsize in pixels */

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

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

  366.         return err;

  367.     }

  368.     s->tabsize *= glyph->advance;

  369. 

  370. #if !HAVE_LOCALTIME_R

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

  372. #endif

  373. 

  374.     return 0;

  375. }

  376. 

  377. static int query_formats(AVFilterContext *ctx)

  378. {

  379.     static const enum AVPixelFormat pix_fmts[] = {

  380.         AV_PIX_FMT_ARGB,    AV_PIX_FMT_RGBA,

  381.         AV_PIX_FMT_ABGR,    AV_PIX_FMT_BGRA,

  382.         AV_PIX_FMT_RGB24,   AV_PIX_FMT_BGR24,

  383.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,

  384.         AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,

  385.         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,

  386.         AV_PIX_FMT_NONE

  387.     };

  388. 

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

  390.     return 0;

  391. }

  392. 

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

  394. {

  395.     av_free(elem);

  396.     return 0;

  397. }

  398. 

  399. static av_cold void uninit(AVFilterContext *ctx)

  400. {

  401.     DrawTextContext *s = ctx->priv;

  402.     int i;

  403. 

  404.     av_expr_free(s->x_pexpr);

  405.     av_expr_free(s->y_pexpr);

  406.     av_expr_free(s->d_pexpr);

  407.     s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;

  408.     av_freep(&s->expanded_text);

  409.     av_freep(&s->positions);

  410.     av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);

  411.     av_tree_destroy(s->glyphs);

  412.     s->glyphs = 0;

  413.     FT_Done_Face(s->face);

  414.     FT_Done_FreeType(s->library);

  415. 

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

  417.         av_freep(&s->box_line[i]);

  418.         s->pixel_step[i] = 0;

  419.     }

  420. 

  421. }

  422. 

  423. static inline int is_newline(uint32_t c)

  424. {

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

  426. }

  427. 

  428. static int dtext_prepare_text(AVFilterContext *ctx)

  429. {

  430.     DrawTextContext *s = ctx->priv;

  431.     uint32_t code = 0, prev_code = 0;

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

  433.     int text_height, baseline;

  434.     char *text = s->text;

  435.     uint8_t *p;

  436.     int str_w = 0, len;

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

  438.     FT_Vector delta;

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

  440.     Glyph dummy = { 0 };

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

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

  443. 

  444. #if HAVE_LOCALTIME_R

  445.     time_t now = time(0);

  446.     struct tm ltime;

  447.     uint8_t *buf = s->expanded_text;

  448.     int buf_size = s->expanded_text_size;

  449. 

  450.     if (!buf)

  451.         buf_size = 2*strlen(s->text)+1;

  452. 

  453.     localtime_r(&now, &ltime);

  454. 

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

  456.         *buf = 1;

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

  458.             break;

  459.         buf_size *= 2;

  460.     }

  461. 

  462.     if (!buf)

  463.         return AVERROR(ENOMEM);

  464.     text = s->expanded_text = buf;

  465.     s->expanded_text_size = buf_size;

  466. #endif

  467. 

  468.     if ((len = strlen(text)) > s->nb_positions) {

  469.         FT_Vector *p = av_realloc(s->positions,

  470.                                   len * sizeof(*s->positions));

  471.         if (!p) {

  472.             av_freep(s->positions);

  473.             s->nb_positions = 0;

  474.             return AVERROR(ENOMEM);

  475.         } else {

  476.             s->positions = p;

  477.             s->nb_positions = len;

  478.         }

  479.     }

  480. 

  481.     /* load and cache glyphs */

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

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

  484. 

  485.         /* get glyph */

  486.         dummy.code = code;

  487.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  488.         if (!glyph) {

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

  490.             if (ret)

  491.                 return ret;

  492.         }

  493. 

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

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

  496.     }

  497.     text_height = y_max - y_min;

  498.     baseline    = y_max;

  499. 

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

  501.     glyph = NULL;

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

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

  504. 

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

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

  507.             continue;

  508. 

  509.         prev_code = code;

  510.         if (is_newline(code)) {

  511.             str_w = FFMAX(str_w, x - s->x);

  512.             y += text_height;

  513.             x = 0;

  514.             continue;

  515.         }

  516. 

  517.         /* get glyph */

  518.         prev_glyph = glyph;

  519.         dummy.code = code;

  520.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  521. 

  522.         /* kerning */

  523.         if (s->use_kerning && prev_glyph && glyph->code) {

  524.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  525.                            ft_kerning_default, &delta);

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

  527.         }

  528. 

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

  530.             str_w = FFMAX(str_w, x);

  531.             y += text_height;

  532.             x = 0;

  533.         }

  534. 

  535.         /* save position */

  536.         s->positions[i].x = x + glyph->bitmap_left;

  537.         s->positions[i].y = y - glyph->bitmap_top + baseline;

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

  539.         else              x += glyph->advance;

  540.     }

  541. 

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

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

  544. 

  545.     s->w = str_w;

  546.     s->var_values[VAR_TEXT_W] = s->var_values[VAR_TW] = s->w;

  547.     s->h = y;

  548.     s->var_values[VAR_TEXT_H] = s->var_values[VAR_TH] = s->h;

  549. 

  550.     return 0;

  551. }

  552. 

  553. 

  554. static int config_input(AVFilterLink *inlink)

  555. {

  556.     AVFilterContext *ctx  = inlink->dst;

  557.     DrawTextContext *s = ctx->priv;

  558.     const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);

  559.     int ret;

  560. 

  561.     s->hsub = pix_desc->log2_chroma_w;

  562.     s->vsub = pix_desc->log2_chroma_h;

  563. 

  564.     s->var_values[VAR_E  ] = M_E;

  565.     s->var_values[VAR_PHI] = M_PHI;

  566.     s->var_values[VAR_PI ] = M_PI;

  567. 

  568.     s->var_values[VAR_MAIN_W] =

  569.         s->var_values[VAR_MW] = ctx->inputs[0]->w;

  570.     s->var_values[VAR_MAIN_H] =

  571.         s->var_values[VAR_MH] = ctx->inputs[0]->h;

  572. 

  573.     s->var_values[VAR_X] = 0;

  574.     s->var_values[VAR_Y] = 0;

  575.     s->var_values[VAR_T] = NAN;

  576. 

  577.     av_lfg_init(&s->prng, av_get_random_seed());

  578. 

  579.     av_expr_free(s->x_pexpr);

  580.     av_expr_free(s->y_pexpr);

  581.     av_expr_free(s->d_pexpr);

  582.     s->x_pexpr = s->y_pexpr = s->d_pexpr = NULL;

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

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

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

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

  587.         (ret = av_expr_parse(&s->d_pexpr, s->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(s->box_line, s->pixel_step,

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

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

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

  596.         return ret;

  597. 

  598.     if (!s->is_packed_rgb) {

  599.         uint8_t *rgba = s->fontcolor_rgba;

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

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

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

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

  604.         rgba = s->shadowcolor_rgba;

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

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

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

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

  609.     }

  610. 

  611.     s->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(frame, yuva_color, val, x, y, hsub, vsub) {           \

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

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

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

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

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

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

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

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

  630.     }\

  631. }

  632. 

  633. static inline int draw_glyph_yuv(AVFrame *frame, 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(frame, yuva_color, src_val, c+x, y+r, hsub, vsub);

  649.         }

  650.     }

  651. 

  652.     return 0;

  653. }

  654. 

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

  656.     p   = frame->data[0] + (x) * pixel_step + ((y) * frame->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(AVFrame *frame, 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(frame, 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(AVFrame *frame, 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(frame, 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(frame, color, 255, i+x, y+j, hsub, vsub);

  706.         }

  707.     } else {

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

  709.                           line, pixel_step, hsub, vsub,

  710.                           x, y, width, height);

  711.     }

  712. }

  713. 

  714. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  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 ? s->expanded_text : s->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(s->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 (s->is_packed_rgb) {

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

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

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

  742.         } else {

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

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

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

  746.         }

  747.     }

  748. 

  749.     return 0;

  750. }

  751. 

  752. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  753.                      int width, int height)

  754. {

  755.     DrawTextContext *s = ctx->priv;

  756.     int ret;

  757. 

  758.     /* draw box */

  759.     if (s->draw_box)

  760.         drawbox(frame, s->x, s->y, s->w, s->h,

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

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

  763.                 s->rgba_map);

  764. 

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

  766.         if ((ret = draw_glyphs(s, frame, width, height,

  767.                                s->shadowcolor_rgba,

  768.                                s->shadowcolor,

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

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

  771.             return ret;

  772.     }

  773. 

  774.     if ((ret = draw_glyphs(s, frame, width, height,

  775.                            s->fontcolor_rgba,

  776.                            s->fontcolor,

  777.                            s->x,

  778.                            s->y)) < 0)

  779.         return ret;

  780. 

  781.     return 0;

  782. }

  783. 

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

  785. {

  786.     int ret = 0;

  787. 

  788.     if (isnan(d)) {

  789.         ret = AVERROR(EINVAL);

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

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

  792.         ret = AVERROR(EINVAL);

  793.     } else

  794.         *n = round(d);

  795. 

  796.     return ret;

  797. }

  798. 

  799. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  800. {

  801.     AVFilterContext *ctx = inlink->dst;

  802.     DrawTextContext *s = ctx->priv;

  803.     int ret = 0;

  804. 

  805.     if ((ret = dtext_prepare_text(ctx)) < 0) {

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

  807.         av_frame_free(&frame);

  808.         return ret;

  809.     }

  810. 

  811.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  812.         NAN : frame->pts * av_q2d(inlink->time_base);

  813.     s->var_values[VAR_X] =

  814.         av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  815.     s->var_values[VAR_Y] =

  816.         av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  817.     s->var_values[VAR_X] =

  818.         av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  819. 

  820.     s->draw = av_expr_eval(s->d_pexpr, s->var_values, &s->prng);

  821. 

  822.     normalize_double(&s->x, s->var_values[VAR_X]);

  823.     normalize_double(&s->y, s->var_values[VAR_Y]);

  824. 

  825.     if (s->fix_bounds) {

  826.         if (s->x < 0) s->x = 0;

  827.         if (s->y < 0) s->y = 0;

  828.         if ((unsigned)s->x + (unsigned)s->w > inlink->w)

  829.             s->x = inlink->w - s->w;

  830.         if ((unsigned)s->y + (unsigned)s->h > inlink->h)

  831.             s->y = inlink->h - s->h;

  832.     }

  833. 

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

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

  836. 

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

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

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

  840. 

  841.     if (s->draw)

  842.         draw_text(inlink->dst, frame, frame->width, frame->height);

  843. 

  844.     s->var_values[VAR_N] += 1.0;

  845. 

  846.     return ff_filter_frame(inlink->dst->outputs[0], frame);

  847. }

  848. 

  849. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  850.     {

  851.         .name             = "default",

  852.         .type             = AVMEDIA_TYPE_VIDEO,

  853.         .get_video_buffer = ff_null_get_video_buffer,

  854.         .filter_frame     = filter_frame,

  855.         .config_props     = config_input,

  856.         .needs_writable   = 1,

  857.     },

  858.     { NULL }

  859. };

  860. 

  861. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  862.     {

  863.         .name = "default",

  864.         .type = AVMEDIA_TYPE_VIDEO,

  865.     },

  866.     { NULL }

  867. };

  868. 

  869. AVFilter ff_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.     .priv_class    = &drawtext_class,

  874.     .init          = init,

  875.     .uninit        = uninit,

  876.     .query_formats = query_formats,

  877. 

  878.     .inputs    = avfilter_vf_drawtext_inputs,

  879.     .outputs   = avfilter_vf_drawtext_outputs,

  880. };