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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/time_internal.h"

  51. #include "libavutil/tree.h"

  52. #include "libavutil/lfg.h"

  53. #include "avfilter.h"

  54. #include "drawutils.h"

  55. #include "formats.h"

  56. #include "internal.h"

  57. #include "video.h"

  58. 

  59. #include <ft2build.h>

  60. #include FT_FREETYPE_H

  61. #include FT_GLYPH_H

  62. 

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

  64.     "E",

  65.     "PHI",

  66.     "PI",

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

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

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

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

  71.     "x",

  72.     "y",

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

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

  75.     NULL

  76. };

  77. 

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

  79.     "rand"

  80. };

  81. 

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

  83. {

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

  85. }

  86. 

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

  88. 

  89. static const eval_func2 fun2[] = {

  90.     drand,

  91.     NULL

  92. };

  93. 

  94. enum var_name {

  95.     VAR_E,

  96.     VAR_PHI,

  97.     VAR_PI,

  98.     VAR_MAIN_W, VAR_MW,

  99.     VAR_MAIN_H, VAR_MH,

  100.     VAR_TEXT_W, VAR_TW,

  101.     VAR_TEXT_H, VAR_TH,

  102.     VAR_X,

  103.     VAR_Y,

  104.     VAR_N,

  105.     VAR_T,

  106.     VAR_VARS_NB

  107. };

  108. 

  109. typedef struct DrawTextContext {

  110.     const AVClass *class;

  111. #if CONFIG_LIBFONTCONFIG

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

  113. #endif

  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, y;                       ///< position to start drawing text

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

  124.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  135. 

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

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

  138.     int tabsize;                    ///< tab size

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

  140. 

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

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

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

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

  145.     int is_packed_rgb;

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

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

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

  149.     char   *x_expr, *y_expr;

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

  151.     double var_values[VAR_VARS_NB];

  152.     char   *d_expr;

  153.     AVExpr *d_pexpr;

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

  155.     AVLFG  prng;                    ///< random

  156. } DrawTextContext;

  157. 

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

  159. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM

  160. 

  161. static const AVOption drawtext_options[]= {

  162. #if CONFIG_LIBFONTCONFIG

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

  164. #endif

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

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

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

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

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

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

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

  172.     { "fontsize",    NULL,                   OFFSET(fontsize),           AV_OPT_TYPE_INT,    { .i64 = 16      }, 1,       1024,    FLAGS },

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

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

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

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

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

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

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

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

  181. 

  182.     /* FT_LOAD_* flags */

  183.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  199.     { NULL},

  200. };

  201. 

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

  203. {

  204.     return "drawtext";

  205. }

  206. 

  207. static const AVClass drawtext_class = {

  208.     "DrawTextContext",

  209.     drawtext_get_name,

  210.     drawtext_options

  211. };

  212. 

  213. #undef __FTERRORS_H__

  214. #define FT_ERROR_START_LIST {

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

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

  217. 

  218. struct ft_error

  219. {

  220.     int err;

  221.     const char *err_msg;

  222. } static ft_errors[] =

  223. #include FT_ERRORS_H

  224. 

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

  226. 

  227. typedef struct Glyph {

  228.     FT_Glyph *glyph;

  229.     uint32_t code;

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

  231.     FT_BBox bbox;

  232.     int advance;

  233.     int bitmap_left;

  234.     int bitmap_top;

  235. } Glyph;

  236. 

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

  238. {

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

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

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

  242. }

  243. 

  244. /**

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

  246.  */

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

  248. {

  249.     DrawTextContext *s = ctx->priv;

  250.     Glyph *glyph;

  251.     struct AVTreeNode *node = NULL;

  252.     int ret;

  253. 

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

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

  256.         return AVERROR(EINVAL);

  257. 

  258.     /* save glyph */

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

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

  261.         ret = AVERROR(ENOMEM);

  262.         goto error;

  263.     }

  264.     glyph->code  = code;

  265. 

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

  267.         ret = AVERROR(EINVAL);

  268.         goto error;

  269.     }

  270. 

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

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

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

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

  275. 

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

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

  278. 

  279.     /* cache the newly created glyph */

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

  281.         ret = AVERROR(ENOMEM);

  282.         goto error;

  283.     }

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

  285. 

  286.     if (glyph_ptr)

  287.         *glyph_ptr = glyph;

  288.     return 0;

  289. 

  290. error:

  291.     if (glyph)

  292.         av_freep(&glyph->glyph);

  293.     av_freep(&glyph);

  294.     av_freep(&node);

  295.     return ret;

  296. }

  297. 

  298. static int parse_font(AVFilterContext *ctx)

  299. {

  300.     DrawTextContext *s = ctx->priv;

  301. #if !CONFIG_LIBFONTCONFIG

  302.     if (!s->fontfile) {

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

  304.         return AVERROR(EINVAL);

  305.     }

  306. 

  307.     return 0;

  308. #else

  309.     FcPattern *pat, *best;

  310.     FcResult result = FcResultMatch;

  311. 

  312.     FcBool fc_bool;

  313.     FcChar8* fc_string;

  314.     int err = AVERROR(ENOENT);

  315. 

  316.     if (s->fontfile)

  317.         return 0;

  318. 

  319.     if (!FcInit())

  320.         return AVERROR_UNKNOWN;

  321. 

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

  323.         return AVERROR(ENOMEM);

  324. 

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

  326.     FcPatternAddBool(pat, FC_OUTLINE, FcTrue);

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

  328. 

  329.     FcDefaultSubstitute(pat);

  330. 

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

  332.         FcPatternDestroy(pat);

  333.         return AVERROR(ENOMEM);

  334.     }

  335. 

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

  337.     FcPatternDestroy(pat);

  338. 

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

  340.          av_log(ctx, AV_LOG_ERROR,

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

  342.                 s->font);

  343.         goto fail;

  344.     }

  345. 

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

  347.         !fc_bool) {

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

  349.                s->font);

  350.         goto fail;

  351.     }

  352. 

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

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

  355.                s->font);

  356.         goto fail;

  357.     }

  358. 

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

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

  361.                s->font);

  362.         goto fail;

  363.     }

  364. 

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

  366.     if (!s->fontfile)

  367.         err = AVERROR(ENOMEM);

  368.     else

  369.         err = 0;

  370. 

  371. fail:

  372.     FcPatternDestroy(best);

  373.     return err;

  374. #endif

  375. }

  376. 

  377. static av_cold int init(AVFilterContext *ctx)

  378. {

  379.     int err;

  380.     DrawTextContext *s = ctx->priv;

  381.     Glyph *glyph;

  382. 

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

  384.         return err;

  385. 

  386.     if (s->textfile) {

  387.         uint8_t *textbuf;

  388.         size_t textbuf_size;

  389. 

  390.         if (s->text) {

  391.             av_log(ctx, AV_LOG_ERROR,

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

  393.             return AVERROR(EINVAL);

  394.         }

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

  396.             av_log(ctx, AV_LOG_ERROR,

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

  398.                    s->textfile);

  399.             return err;

  400.         }

  401. 

  402.         if (textbuf_size > SIZE_MAX - 1 ||

  403.             !(s->text = av_malloc(textbuf_size + 1))) {

  404.             av_file_unmap(textbuf, textbuf_size);

  405.             return AVERROR(ENOMEM);

  406.         }

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

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

  409.         av_file_unmap(textbuf, textbuf_size);

  410.     }

  411. 

  412.     if (!s->text) {

  413.         av_log(ctx, AV_LOG_ERROR,

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

  415.         return AVERROR(EINVAL);

  416.     }

  417. 

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

  419.         av_log(ctx, AV_LOG_ERROR,

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

  421.         return err;

  422.     }

  423. 

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

  425.         av_log(ctx, AV_LOG_ERROR,

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

  427.         return err;

  428.     }

  429. 

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

  431.         av_log(ctx, AV_LOG_ERROR,

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

  433.         return err;

  434.     }

  435. 

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

  437.         av_log(ctx, AV_LOG_ERROR,

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

  439.         return AVERROR(EINVAL);

  440.     }

  441. 

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

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

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

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

  446.         return AVERROR(EINVAL);

  447.     }

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

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

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

  451.         return AVERROR(EINVAL);

  452.     }

  453. 

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

  455. 

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

  457.     load_glyph(ctx, NULL, 0);

  458. 

  459.     /* set the tabsize in pixels */

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

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

  462.         return err;

  463.     }

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

  465. 

  466. #if !HAVE_LOCALTIME_R

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

  468. #endif

  469. 

  470.     return 0;

  471. }

  472. 

  473. static int query_formats(AVFilterContext *ctx)

  474. {

  475.     static const enum AVPixelFormat pix_fmts[] = {

  476.         AV_PIX_FMT_ARGB,    AV_PIX_FMT_RGBA,

  477.         AV_PIX_FMT_ABGR,    AV_PIX_FMT_BGRA,

  478.         AV_PIX_FMT_RGB24,   AV_PIX_FMT_BGR24,

  479.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,

  480.         AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,

  481.         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,

  482.         AV_PIX_FMT_NONE

  483.     };

  484. 

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

  486.     return 0;

  487. }

  488. 

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

  490. {

  491.     av_free(elem);

  492.     return 0;

  493. }

  494. 

  495. static av_cold void uninit(AVFilterContext *ctx)

  496. {

  497.     DrawTextContext *s = ctx->priv;

  498.     int i;

  499. 

  500.     av_expr_free(s->x_pexpr);

  501.     av_expr_free(s->y_pexpr);

  502.     av_expr_free(s->d_pexpr);

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

  504.     av_freep(&s->expanded_text);

  505.     av_freep(&s->positions);

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

  507.     av_tree_destroy(s->glyphs);

  508.     s->glyphs = 0;

  509.     FT_Done_Face(s->face);

  510.     FT_Done_FreeType(s->library);

  511. 

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

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

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

  515.     }

  516. 

  517. }

  518. 

  519. static inline int is_newline(uint32_t c)

  520. {

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

  522. }

  523. 

  524. static int dtext_prepare_text(AVFilterContext *ctx)

  525. {

  526.     DrawTextContext *s = ctx->priv;

  527.     uint32_t code = 0, prev_code = 0;

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

  529.     int text_height, baseline;

  530.     char *text = s->text;

  531.     uint8_t *p;

  532.     int str_w = 0, len;

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

  534.     FT_Vector delta;

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

  536.     Glyph dummy = { 0 };

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

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

  539.     time_t now = time(0);

  540.     struct tm ltime;

  541.     uint8_t *buf = s->expanded_text;

  542.     int buf_size = s->expanded_text_size;

  543. 

  544.     if (!buf)

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

  546. 

  547.     localtime_r(&now, &ltime);

  548. 

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

  550.         *buf = 1;

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

  552.             break;

  553.         buf_size *= 2;

  554.     }

  555. 

  556.     if (!buf)

  557.         return AVERROR(ENOMEM);

  558.     text = s->expanded_text = buf;

  559.     s->expanded_text_size = buf_size;

  560. 

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

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

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

  564.         if (!p) {

  565.             av_freep(s->positions);

  566.             s->nb_positions = 0;

  567.             return AVERROR(ENOMEM);

  568.         } else {

  569.             s->positions = p;

  570.             s->nb_positions = len;

  571.         }

  572.     }

  573. 

  574.     /* load and cache glyphs */

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

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

  577. 

  578.         /* get glyph */

  579.         dummy.code = code;

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

  581.         if (!glyph) {

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

  583.             if (ret)

  584.                 return ret;

  585.         }

  586. 

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

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

  589.     }

  590.     text_height = y_max - y_min;

  591.     baseline    = y_max;

  592. 

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

  594.     glyph = NULL;

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

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

  597. 

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

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

  600.             continue;

  601. 

  602.         prev_code = code;

  603.         if (is_newline(code)) {

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

  605.             y += text_height;

  606.             x = 0;

  607.             continue;

  608.         }

  609. 

  610.         /* get glyph */

  611.         prev_glyph = glyph;

  612.         dummy.code = code;

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

  614. 

  615.         /* kerning */

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

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

  618.                            ft_kerning_default, &delta);

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

  620.         }

  621. 

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

  623.             str_w = FFMAX(str_w, x);

  624.             y += text_height;

  625.             x = 0;

  626.         }

  627. 

  628.         /* save position */

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

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

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

  632.         else              x += glyph->advance;

  633.     }

  634. 

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

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

  637. 

  638.     s->w = str_w;

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

  640.     s->h = y;

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

  642. 

  643.     return 0;

  644. }

  645. 

  646. 

  647. static int config_input(AVFilterLink *inlink)

  648. {

  649.     AVFilterContext *ctx  = inlink->dst;

  650.     DrawTextContext *s = ctx->priv;

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

  652.     int ret;

  653. 

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

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

  656. 

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

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

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

  660. 

  661.     s->var_values[VAR_MAIN_W] =

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

  663.     s->var_values[VAR_MAIN_H] =

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

  665. 

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

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

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

  669. 

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

  671. 

  672.     av_expr_free(s->x_pexpr);

  673.     av_expr_free(s->y_pexpr);

  674.     av_expr_free(s->d_pexpr);

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

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

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

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

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

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

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

  682.         return AVERROR(EINVAL);

  683. 

  684.     if ((ret =

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

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

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

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

  689.         return ret;

  690. 

  691.     if (!s->is_packed_rgb) {

  692.         uint8_t *rgba = s->fontcolor_rgba;

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

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

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

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

  697.         rgba = s->shadowcolor_rgba;

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

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

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

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

  702.     }

  703. 

  704.     s->draw = 1;

  705. 

  706.     return dtext_prepare_text(ctx);

  707. }

  708. 

  709. #define GET_BITMAP_VAL(r, c)                                            \

  710.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  713. 

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

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

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

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

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

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

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

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

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

  723.     }\

  724. }

  725. 

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

  727.                                  unsigned int y, unsigned int width, unsigned int height,

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

  729. {

  730.     int r, c, alpha;

  731.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  732.     uint8_t src_val;

  733. 

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

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

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

  737.             src_val = GET_BITMAP_VAL(r, c);

  738.             if (!src_val)

  739.                 continue;

  740. 

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

  742.         }

  743.     }

  744. 

  745.     return 0;

  746. }

  747. 

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

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

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

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

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

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

  754. }

  755. 

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

  757.                                  unsigned int x, unsigned int y,

  758.                                  unsigned int width, unsigned int height, int pixel_step,

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

  760. {

  761.     int r, c, alpha;

  762.     uint8_t *p;

  763.     uint8_t src_val;

  764. 

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

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

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

  768.             src_val = GET_BITMAP_VAL(r, c);

  769.             if (!src_val)

  770.                 continue;

  771. 

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

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

  774.         }

  775.     }

  776. 

  777.     return 0;

  778. }

  779. 

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

  781.                            unsigned int width, unsigned int height,

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

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

  784. {

  785.     int i, j, alpha;

  786. 

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

  788.         if (is_rgba_packed) {

  789.             uint8_t *p;

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

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

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

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

  794.         } else {

  795.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  799.         }

  800.     } else {

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

  802.                           line, pixel_step, hsub, vsub,

  803.                           x, y, width, height);

  804.     }

  805. }

  806. 

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

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

  809. {

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

  811.     uint32_t code = 0;

  812.     int i;

  813.     uint8_t *p;

  814.     Glyph *glyph = NULL;

  815. 

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

  817.         Glyph dummy = { 0 };

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

  819. 

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

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

  822.             continue;

  823. 

  824.         dummy.code = code;

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

  826. 

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

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

  829.             return AVERROR(EINVAL);

  830. 

  831.         if (s->is_packed_rgb) {

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

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

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

  835.         } else {

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

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

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

  839.         }

  840.     }

  841. 

  842.     return 0;

  843. }

  844. 

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

  846.                      int width, int height)

  847. {

  848.     DrawTextContext *s = ctx->priv;

  849.     int ret;

  850. 

  851.     /* draw box */

  852.     if (s->draw_box)

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

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

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

  856.                 s->rgba_map);

  857. 

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

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

  860.                                s->shadowcolor_rgba,

  861.                                s->shadowcolor,

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

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

  864.             return ret;

  865.     }

  866. 

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

  868.                            s->fontcolor_rgba,

  869.                            s->fontcolor,

  870.                            s->x,

  871.                            s->y)) < 0)

  872.         return ret;

  873. 

  874.     return 0;

  875. }

  876. 

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

  878. {

  879.     int ret = 0;

  880. 

  881.     if (isnan(d)) {

  882.         ret = AVERROR(EINVAL);

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

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

  885.         ret = AVERROR(EINVAL);

  886.     } else

  887.         *n = round(d);

  888. 

  889.     return ret;

  890. }

  891. 

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

  893. {

  894.     AVFilterContext *ctx = inlink->dst;

  895.     DrawTextContext *s = ctx->priv;

  896.     int ret = 0;

  897. 

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

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

  900.         av_frame_free(&frame);

  901.         return ret;

  902.     }

  903. 

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

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

  906.     s->var_values[VAR_X] =

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

  908.     s->var_values[VAR_Y] =

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

  910.     s->var_values[VAR_X] =

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

  912. 

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

  914. 

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

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

  917. 

  918.     if (s->fix_bounds) {

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

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

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

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

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

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

  925.     }

  926. 

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

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

  929. 

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

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

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

  933. 

  934.     if (s->draw)

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

  936. 

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

  938. 

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

  940. }

  941. 

  942. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  943.     {

  944.         .name             = "default",

  945.         .type             = AVMEDIA_TYPE_VIDEO,

  946.         .get_video_buffer = ff_null_get_video_buffer,

  947.         .filter_frame     = filter_frame,

  948.         .config_props     = config_input,

  949.         .needs_writable   = 1,

  950.     },

  951.     { NULL }

  952. };

  953. 

  954. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  955.     {

  956.         .name = "default",

  957.         .type = AVMEDIA_TYPE_VIDEO,

  958.     },

  959.     { NULL }

  960. };

  961. 

  962. AVFilter ff_vf_drawtext = {

  963.     .name          = "drawtext",

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

  965.     .priv_size     = sizeof(DrawTextContext),

  966.     .priv_class    = &drawtext_class,

  967.     .init          = init,

  968.     .uninit        = uninit,

  969.     .query_formats = query_formats,

  970. 

  971.     .inputs    = avfilter_vf_drawtext_inputs,

  972.     .outputs   = avfilter_vf_drawtext_outputs,

  973. };