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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 "config.h"

  30. 

  31. #include <sys/types.h>

  32. #include <sys/time.h>

  33. #include <sys/stat.h>

  34. #include <time.h>

  35. #include <unistd.h>

  36. 

  37. #if CONFIG_LIBFONTCONFIG

  38. #include <fontconfig/fontconfig.h>

  39. #endif

  40. 

  41. #include "libavutil/colorspace.h"

  42. #include "libavutil/common.h"

  43. #include "libavutil/file.h"

  44. #include "libavutil/eval.h"

  45. #include "libavutil/opt.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/random_seed.h"

  48. #include "libavutil/parseutils.h"

  49. #include "libavutil/pixdesc.h"

  50. #include "libavutil/tree.h"

  51. #include "libavutil/lfg.h"

  52. #include "avfilter.h"

  53. #include "drawutils.h"

  54. #include "formats.h"

  55. #include "internal.h"

  56. #include "video.h"

  57. 

  58. #include <ft2build.h>

  59. #include FT_FREETYPE_H

  60. #include FT_GLYPH_H

  61. 

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

  63.     "E",

  64.     "PHI",

  65.     "PI",

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

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

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

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

  70.     "x",

  71.     "y",

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

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

  74.     NULL

  75. };

  76. 

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

  78.     "rand"

  79. };

  80. 

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

  82. {

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

  84. }

  85. 

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

  87. 

  88. static const eval_func2 fun2[] = {

  89.     drand,

  90.     NULL

  91. };

  92. 

  93. enum var_name {

  94.     VAR_E,

  95.     VAR_PHI,

  96.     VAR_PI,

  97.     VAR_MAIN_W, VAR_MW,

  98.     VAR_MAIN_H, VAR_MH,

  99.     VAR_TEXT_W, VAR_TW,

  100.     VAR_TEXT_H, VAR_TH,

  101.     VAR_X,

  102.     VAR_Y,

  103.     VAR_N,

  104.     VAR_T,

  105.     VAR_VARS_NB

  106. };

  107. 

  108. typedef struct DrawTextContext {

  109.     const AVClass *class;

  110. #if CONFIG_LIBFONTCONFIG

  111.     uint8_t *font;              ///< font to be used

  112. #endif

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

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

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

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

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

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

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

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

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

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

  123.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  134. 

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

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

  137.     int tabsize;                    ///< tab size

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

  139. 

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

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

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

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

  144.     int is_packed_rgb;

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

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

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

  148.     char   *x_expr, *y_expr;

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

  150.     double var_values[VAR_VARS_NB];

  151.     char   *d_expr;

  152.     AVExpr *d_pexpr;

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

  154.     AVLFG  prng;                    ///< random

  155. } DrawTextContext;

  156. 

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

  158. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM

  159. 

  160. static const AVOption drawtext_options[]= {

  161. #if CONFIG_LIBFONTCONFIG

  162.     { "font",        "Font name",            OFFSET(font),               AV_OPT_TYPE_STRING, { .str = "Sans" },           .flags = FLAGS },

  163. #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  180. 

  181.     /* FT_LOAD_* flags */

  182.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  198.     { NULL},

  199. };

  200. 

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

  202. {

  203.     return "drawtext";

  204. }

  205. 

  206. static const AVClass drawtext_class = {

  207.     "DrawTextContext",

  208.     drawtext_get_name,

  209.     drawtext_options

  210. };

  211. 

  212. #undef __FTERRORS_H__

  213. #define FT_ERROR_START_LIST {

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

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

  216. 

  217. struct ft_error

  218. {

  219.     int err;

  220.     const char *err_msg;

  221. } static ft_errors[] =

  222. #include FT_ERRORS_H

  223. 

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

  225. 

  226. typedef struct Glyph {

  227.     FT_Glyph *glyph;

  228.     uint32_t code;

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

  230.     FT_BBox bbox;

  231.     int advance;

  232.     int bitmap_left;

  233.     int bitmap_top;

  234. } Glyph;

  235. 

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

  237. {

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

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

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

  241. }

  242. 

  243. /**

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

  245.  */

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

  247. {

  248.     DrawTextContext *s = ctx->priv;

  249.     Glyph *glyph;

  250.     struct AVTreeNode *node = NULL;

  251.     int ret;

  252. 

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

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

  255.         return AVERROR(EINVAL);

  256. 

  257.     /* save glyph */

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

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

  260.         ret = AVERROR(ENOMEM);

  261.         goto error;

  262.     }

  263.     glyph->code  = code;

  264. 

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

  266.         ret = AVERROR(EINVAL);

  267.         goto error;

  268.     }

  269. 

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

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

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

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

  274. 

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

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

  277. 

  278.     /* cache the newly created glyph */

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

  280.         ret = AVERROR(ENOMEM);

  281.         goto error;

  282.     }

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

  284. 

  285.     if (glyph_ptr)

  286.         *glyph_ptr = glyph;

  287.     return 0;

  288. 

  289. error:

  290.     if (glyph)

  291.         av_freep(&glyph->glyph);

  292.     av_freep(&glyph);

  293.     av_freep(&node);

  294.     return ret;

  295. }

  296. 

  297. static int parse_font(AVFilterContext *ctx)

  298. {

  299.     DrawTextContext *s = ctx->priv;

  300. #if !CONFIG_LIBFONTCONFIG

  301.     if (!s->fontfile) {

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

  303.         return AVERROR(EINVAL);

  304.     }

  305. 

  306.     return 0;

  307. #else

  308.     FcPattern *pat, *best;

  309.     FcResult result = FcResultMatch;

  310. 

  311.     FcBool fc_bool;

  312.     FcChar8* fc_string;

  313.     int err = AVERROR(ENOENT);

  314. 

  315.     if (s->fontfile)

  316.         return 0;

  317. 

  318.     if (!FcInit())

  319.         return AVERROR_UNKNOWN;

  320. 

  321.     if (!(pat = FcPatternCreate()))

  322.         return AVERROR(ENOMEM);

  323. 

  324.     FcPatternAddString(pat, FC_FAMILY, s->font);

  325.     FcPatternAddBool(pat, FC_OUTLINE, FcTrue);

  326.     FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);

  327. 

  328.     FcDefaultSubstitute(pat);

  329. 

  330.     if (!FcConfigSubstitute(NULL, pat, FcMatchPattern)) {

  331.         FcPatternDestroy(pat);

  332.         return AVERROR(ENOMEM);

  333.     }

  334. 

  335.     best = FcFontMatch(NULL, pat, &result);

  336.     FcPatternDestroy(pat);

  337. 

  338.     if (!best || result == FcResultNoMatch) {

  339.          av_log(ctx, AV_LOG_ERROR,

  340.                 "Cannot find a valid font for the family %s\n",

  341.                 s->font);

  342.         goto fail;

  343.     }

  344. 

  345.     if (FcPatternGetBool(best, FC_OUTLINE, 0, &fc_bool) != FcResultMatch ||

  346.         !fc_bool) {

  347.         av_log(ctx, AV_LOG_ERROR, "Outline not available for %s\n",

  348.                s->font);

  349.         goto fail;

  350.     }

  351. 

  352.     if (FcPatternGetString(best, FC_FAMILY, 0, &fc_string) != FcResultMatch) {

  353.         av_log(ctx, AV_LOG_ERROR, "No matches for %s\n",

  354.                s->font);

  355.         goto fail;

  356.     }

  357. 

  358.     if (FcPatternGetString(best, FC_FILE, 0, &fc_string) != FcResultMatch) {

  359.         av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",

  360.                s->font);

  361.         goto fail;

  362.     }

  363. 

  364.     s->fontfile = av_strdup(fc_string);

  365.     if (!s->fontfile)

  366.         err = AVERROR(ENOMEM);

  367.     else

  368.         err = 0;

  369. 

  370. fail:

  371.     FcPatternDestroy(best);

  372.     return err;

  373. #endif

  374. }

  375. 

  376. static av_cold int init(AVFilterContext *ctx)

  377. {

  378.     int err;

  379.     DrawTextContext *s = ctx->priv;

  380.     Glyph *glyph;

  381. 

  382.     if ((err = parse_font(ctx)) < 0)

  383.         return err;

  384. 

  385.     if (s->textfile) {

  386.         uint8_t *textbuf;

  387.         size_t textbuf_size;

  388. 

  389.         if (s->text) {

  390.             av_log(ctx, AV_LOG_ERROR,

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

  392.             return AVERROR(EINVAL);

  393.         }

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

  395.             av_log(ctx, AV_LOG_ERROR,

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

  397.                    s->textfile);

  398.             return err;

  399.         }

  400. 

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

  402.             return AVERROR(ENOMEM);

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

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

  405.         av_file_unmap(textbuf, textbuf_size);

  406.     }

  407. 

  408.     if (!s->text) {

  409.         av_log(ctx, AV_LOG_ERROR,

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

  411.         return AVERROR(EINVAL);

  412.     }

  413. 

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

  415.         av_log(ctx, AV_LOG_ERROR,

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

  417.         return err;

  418.     }

  419. 

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

  421.         av_log(ctx, AV_LOG_ERROR,

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

  423.         return err;

  424.     }

  425. 

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

  427.         av_log(ctx, AV_LOG_ERROR,

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

  429.         return err;

  430.     }

  431. 

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

  433.         av_log(ctx, AV_LOG_ERROR,

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

  435.         return AVERROR(EINVAL);

  436.     }

  437. 

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

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

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

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

  442.         return AVERROR(EINVAL);

  443.     }

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

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

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

  447.         return AVERROR(EINVAL);

  448.     }

  449. 

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

  451. 

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

  453.     load_glyph(ctx, NULL, 0);

  454. 

  455.     /* set the tabsize in pixels */

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

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

  458.         return err;

  459.     }

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

  461. 

  462. #if !HAVE_LOCALTIME_R

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

  464. #endif

  465. 

  466.     return 0;

  467. }

  468. 

  469. static int query_formats(AVFilterContext *ctx)

  470. {

  471.     static const enum AVPixelFormat pix_fmts[] = {

  472.         AV_PIX_FMT_ARGB,    AV_PIX_FMT_RGBA,

  473.         AV_PIX_FMT_ABGR,    AV_PIX_FMT_BGRA,

  474.         AV_PIX_FMT_RGB24,   AV_PIX_FMT_BGR24,

  475.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,

  476.         AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,

  477.         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,

  478.         AV_PIX_FMT_NONE

  479.     };

  480. 

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

  482.     return 0;

  483. }

  484. 

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

  486. {

  487.     av_free(elem);

  488.     return 0;

  489. }

  490. 

  491. static av_cold void uninit(AVFilterContext *ctx)

  492. {

  493.     DrawTextContext *s = ctx->priv;

  494.     int i;

  495. 

  496.     av_expr_free(s->x_pexpr);

  497.     av_expr_free(s->y_pexpr);

  498.     av_expr_free(s->d_pexpr);

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

  500.     av_freep(&s->expanded_text);

  501.     av_freep(&s->positions);

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

  503.     av_tree_destroy(s->glyphs);

  504.     s->glyphs = 0;

  505.     FT_Done_Face(s->face);

  506.     FT_Done_FreeType(s->library);

  507. 

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

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

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

  511.     }

  512. 

  513. }

  514. 

  515. static inline int is_newline(uint32_t c)

  516. {

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

  518. }

  519. 

  520. static int dtext_prepare_text(AVFilterContext *ctx)

  521. {

  522.     DrawTextContext *s = ctx->priv;

  523.     uint32_t code = 0, prev_code = 0;

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

  525.     int text_height, baseline;

  526.     char *text = s->text;

  527.     uint8_t *p;

  528.     int str_w = 0, len;

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

  530.     FT_Vector delta;

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

  532.     Glyph dummy = { 0 };

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

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

  535. 

  536. #if HAVE_LOCALTIME_R

  537.     time_t now = time(0);

  538.     struct tm ltime;

  539.     uint8_t *buf = s->expanded_text;

  540.     int buf_size = s->expanded_text_size;

  541. 

  542.     if (!buf)

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

  544. 

  545.     localtime_r(&now, &ltime);

  546. 

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

  548.         *buf = 1;

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

  550.             break;

  551.         buf_size *= 2;

  552.     }

  553. 

  554.     if (!buf)

  555.         return AVERROR(ENOMEM);

  556.     text = s->expanded_text = buf;

  557.     s->expanded_text_size = buf_size;

  558. #endif

  559. 

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

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

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

  563.         if (!p) {

  564.             av_freep(s->positions);

  565.             s->nb_positions = 0;

  566.             return AVERROR(ENOMEM);

  567.         } else {

  568.             s->positions = p;

  569.             s->nb_positions = len;

  570.         }

  571.     }

  572. 

  573.     /* load and cache glyphs */

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

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

  576. 

  577.         /* get glyph */

  578.         dummy.code = code;

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

  580.         if (!glyph) {

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

  582.             if (ret)

  583.                 return ret;

  584.         }

  585. 

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

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

  588.     }

  589.     text_height = y_max - y_min;

  590.     baseline    = y_max;

  591. 

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

  593.     glyph = NULL;

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

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

  596. 

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

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

  599.             continue;

  600. 

  601.         prev_code = code;

  602.         if (is_newline(code)) {

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

  604.             y += text_height;

  605.             x = 0;

  606.             continue;

  607.         }

  608. 

  609.         /* get glyph */

  610.         prev_glyph = glyph;

  611.         dummy.code = code;

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

  613. 

  614.         /* kerning */

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

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

  617.                            ft_kerning_default, &delta);

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

  619.         }

  620. 

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

  622.             str_w = FFMAX(str_w, x);

  623.             y += text_height;

  624.             x = 0;

  625.         }

  626. 

  627.         /* save position */

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

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

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

  631.         else              x += glyph->advance;

  632.     }

  633. 

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

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

  636. 

  637.     s->w = str_w;

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

  639.     s->h = y;

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

  641. 

  642.     return 0;

  643. }

  644. 

  645. 

  646. static int config_input(AVFilterLink *inlink)

  647. {

  648.     AVFilterContext *ctx  = inlink->dst;

  649.     DrawTextContext *s = ctx->priv;

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

  651.     int ret;

  652. 

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

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

  655. 

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

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

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

  659. 

  660.     s->var_values[VAR_MAIN_W] =

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

  662.     s->var_values[VAR_MAIN_H] =

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

  664. 

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

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

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

  668. 

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

  670. 

  671.     av_expr_free(s->x_pexpr);

  672.     av_expr_free(s->y_pexpr);

  673.     av_expr_free(s->d_pexpr);

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

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

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

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

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

  679.         (ret = av_expr_parse(&s->d_pexpr, s->d_expr, var_names,

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

  681.         return AVERROR(EINVAL);

  682. 

  683.     if ((ret =

  684.          ff_fill_line_with_color(s->box_line, s->pixel_step,

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

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

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

  688.         return ret;

  689. 

  690.     if (!s->is_packed_rgb) {

  691.         uint8_t *rgba = s->fontcolor_rgba;

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

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

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

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

  696.         rgba = s->shadowcolor_rgba;

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

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

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

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

  701.     }

  702. 

  703.     s->draw = 1;

  704. 

  705.     return dtext_prepare_text(ctx);

  706. }

  707. 

  708. #define GET_BITMAP_VAL(r, c)                                            \

  709.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  712. 

  713. #define SET_PIXEL_YUV(frame, yuva_color, val, x, y, hsub, vsub) {           \

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

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

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

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

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

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

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

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

  722.     }\

  723. }

  724. 

  725. static inline int draw_glyph_yuv(AVFrame *frame, FT_Bitmap *bitmap, unsigned int x,

  726.                                  unsigned int y, unsigned int width, unsigned int height,

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

  728. {

  729.     int r, c, alpha;

  730.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  731.     uint8_t src_val;

  732. 

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

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

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

  736.             src_val = GET_BITMAP_VAL(r, c);

  737.             if (!src_val)

  738.                 continue;

  739. 

  740.             SET_PIXEL_YUV(frame, yuva_color, src_val, c+x, y+r, hsub, vsub);

  741.         }

  742.     }

  743. 

  744.     return 0;

  745. }

  746. 

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

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

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

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

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

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

  753. }

  754. 

  755. static inline int draw_glyph_rgb(AVFrame *frame, FT_Bitmap *bitmap,

  756.                                  unsigned int x, unsigned int y,

  757.                                  unsigned int width, unsigned int height, int pixel_step,

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

  759. {

  760.     int r, c, alpha;

  761.     uint8_t *p;

  762.     uint8_t src_val;

  763. 

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

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

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

  767.             src_val = GET_BITMAP_VAL(r, c);

  768.             if (!src_val)

  769.                 continue;

  770. 

  771.             SET_PIXEL_RGB(frame, rgba_color, src_val, c+x, y+r, pixel_step,

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

  773.         }

  774.     }

  775. 

  776.     return 0;

  777. }

  778. 

  779. static inline void drawbox(AVFrame *frame, unsigned int x, unsigned int y,

  780.                            unsigned int width, unsigned int height,

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

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

  783. {

  784.     int i, j, alpha;

  785. 

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

  787.         if (is_rgba_packed) {

  788.             uint8_t *p;

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

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

  791.                     SET_PIXEL_RGB(frame, color, 255, i+x, y+j, pixel_step[0],

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

  793.         } else {

  794.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

  797.                     SET_PIXEL_YUV(frame, color, 255, i+x, y+j, hsub, vsub);

  798.         }

  799.     } else {

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

  801.                           line, pixel_step, hsub, vsub,

  802.                           x, y, width, height);

  803.     }

  804. }

  805. 

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

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

  808. {

  809.     char *text = HAVE_LOCALTIME_R ? s->expanded_text : s->text;

  810.     uint32_t code = 0;

  811.     int i;

  812.     uint8_t *p;

  813.     Glyph *glyph = NULL;

  814. 

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

  816.         Glyph dummy = { 0 };

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

  818. 

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

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

  821.             continue;

  822. 

  823.         dummy.code = code;

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

  825. 

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

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

  828.             return AVERROR(EINVAL);

  829. 

  830.         if (s->is_packed_rgb) {

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

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

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

  834.         } else {

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

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

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

  838.         }

  839.     }

  840. 

  841.     return 0;

  842. }

  843. 

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

  845.                      int width, int height)

  846. {

  847.     DrawTextContext *s = ctx->priv;

  848.     int ret;

  849. 

  850.     /* draw box */

  851.     if (s->draw_box)

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

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

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

  855.                 s->rgba_map);

  856. 

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

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

  859.                                s->shadowcolor_rgba,

  860.                                s->shadowcolor,

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

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

  863.             return ret;

  864.     }

  865. 

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

  867.                            s->fontcolor_rgba,

  868.                            s->fontcolor,

  869.                            s->x,

  870.                            s->y)) < 0)

  871.         return ret;

  872. 

  873.     return 0;

  874. }

  875. 

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

  877. {

  878.     int ret = 0;

  879. 

  880.     if (isnan(d)) {

  881.         ret = AVERROR(EINVAL);

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

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

  884.         ret = AVERROR(EINVAL);

  885.     } else

  886.         *n = round(d);

  887. 

  888.     return ret;

  889. }

  890. 

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

  892. {

  893.     AVFilterContext *ctx = inlink->dst;

  894.     DrawTextContext *s = ctx->priv;

  895.     int ret = 0;

  896. 

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

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

  899.         av_frame_free(&frame);

  900.         return ret;

  901.     }

  902. 

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

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

  905.     s->var_values[VAR_X] =

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

  907.     s->var_values[VAR_Y] =

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

  909.     s->var_values[VAR_X] =

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

  911. 

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

  913. 

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

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

  916. 

  917.     if (s->fix_bounds) {

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

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

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

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

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

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

  924.     }

  925. 

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

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

  928. 

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

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

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

  932. 

  933.     if (s->draw)

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

  935. 

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

  937. 

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

  939. }

  940. 

  941. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  942.     {

  943.         .name             = "default",

  944.         .type             = AVMEDIA_TYPE_VIDEO,

  945.         .get_video_buffer = ff_null_get_video_buffer,

  946.         .filter_frame     = filter_frame,

  947.         .config_props     = config_input,

  948.         .needs_writable   = 1,

  949.     },

  950.     { NULL }

  951. };

  952. 

  953. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  954.     {

  955.         .name = "default",

  956.         .type = AVMEDIA_TYPE_VIDEO,

  957.     },

  958.     { NULL }

  959. };

  960. 

  961. AVFilter ff_vf_drawtext = {

  962.     .name          = "drawtext",

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

  964.     .priv_size     = sizeof(DrawTextContext),

  965.     .priv_class    = &drawtext_class,

  966.     .init          = init,

  967.     .uninit        = uninit,

  968.     .query_formats = query_formats,

  969. 

  970.     .inputs    = avfilter_vf_drawtext_inputs,

  971.     .outputs   = avfilter_vf_drawtext_outputs,

  972. };