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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.     char   *a_expr;

  156.     AVExpr *a_pexpr;

  157.     int alpha;

  158.     AVLFG  prng;                    ///< random

  159. } DrawTextContext;

  160. 

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

  162. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM

  163. 

  164. static const AVOption drawtext_options[]= {

  165. #if CONFIG_LIBFONTCONFIG

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

  167. #endif

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  182.     { "alpha",       "apply alpha while rendering", OFFSET(a_expr),      AV_OPT_TYPE_STRING, { .str = "1"     },          .flags = FLAGS },

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

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

  185. 

  186.     /* FT_LOAD_* flags */

  187.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  203.     { NULL},

  204. };

  205. 

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

  207. {

  208.     return "drawtext";

  209. }

  210. 

  211. static const AVClass drawtext_class = {

  212.     "DrawTextContext",

  213.     drawtext_get_name,

  214.     drawtext_options

  215. };

  216. 

  217. #undef __FTERRORS_H__

  218. #define FT_ERROR_START_LIST {

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

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

  221. 

  222. static const struct ft_error {

  223.     int err;

  224.     const char *err_msg;

  225. } ft_errors[] =

  226. #include FT_ERRORS_H

  227. 

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

  229. 

  230. typedef struct Glyph {

  231.     FT_Glyph *glyph;

  232.     uint32_t code;

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

  234.     FT_BBox bbox;

  235.     int advance;

  236.     int bitmap_left;

  237.     int bitmap_top;

  238. } Glyph;

  239. 

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

  241. {

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

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

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

  245. }

  246. 

  247. /**

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

  249.  */

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

  251. {

  252.     DrawTextContext *s = ctx->priv;

  253.     Glyph *glyph;

  254.     struct AVTreeNode *node = NULL;

  255.     int ret;

  256. 

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

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

  259.         return AVERROR(EINVAL);

  260. 

  261.     /* save glyph */

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

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

  264.         ret = AVERROR(ENOMEM);

  265.         goto error;

  266.     }

  267.     glyph->code  = code;

  268. 

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

  270.         ret = AVERROR(EINVAL);

  271.         goto error;

  272.     }

  273. 

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

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

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

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

  278. 

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

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

  281. 

  282.     /* cache the newly created glyph */

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

  284.         ret = AVERROR(ENOMEM);

  285.         goto error;

  286.     }

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

  288. 

  289.     if (glyph_ptr)

  290.         *glyph_ptr = glyph;

  291.     return 0;

  292. 

  293. error:

  294.     if (glyph)

  295.         av_freep(&glyph->glyph);

  296.     av_freep(&glyph);

  297.     av_freep(&node);

  298.     return ret;

  299. }

  300. 

  301. static int parse_font(AVFilterContext *ctx)

  302. {

  303.     DrawTextContext *s = ctx->priv;

  304. #if !CONFIG_LIBFONTCONFIG

  305.     if (!s->fontfile) {

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

  307.         return AVERROR(EINVAL);

  308.     }

  309. 

  310.     return 0;

  311. #else

  312.     FcPattern *pat, *best;

  313.     FcResult result = FcResultMatch;

  314. 

  315.     FcBool fc_bool;

  316.     FcChar8* fc_string;

  317.     int err = AVERROR(ENOENT);

  318. 

  319.     if (s->fontfile)

  320.         return 0;

  321. 

  322.     if (!FcInit())

  323.         return AVERROR_UNKNOWN;

  324. 

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

  326.         return AVERROR(ENOMEM);

  327. 

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

  329.     FcPatternAddBool(pat, FC_OUTLINE, FcTrue);

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

  331. 

  332.     FcDefaultSubstitute(pat);

  333. 

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

  335.         FcPatternDestroy(pat);

  336.         return AVERROR(ENOMEM);

  337.     }

  338. 

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

  340.     FcPatternDestroy(pat);

  341. 

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

  343.          av_log(ctx, AV_LOG_ERROR,

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

  345.                 s->font);

  346.         goto fail;

  347.     }

  348. 

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

  350.         !fc_bool) {

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

  352.                s->font);

  353.         goto fail;

  354.     }

  355. 

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

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

  358.                s->font);

  359.         goto fail;

  360.     }

  361. 

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

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

  364.                s->font);

  365.         goto fail;

  366.     }

  367. 

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

  369.     if (!s->fontfile)

  370.         err = AVERROR(ENOMEM);

  371.     else

  372.         err = 0;

  373. 

  374. fail:

  375.     FcPatternDestroy(best);

  376.     return err;

  377. #endif

  378. }

  379. 

  380. static av_cold int init(AVFilterContext *ctx)

  381. {

  382.     int err;

  383.     DrawTextContext *s = ctx->priv;

  384.     Glyph *glyph;

  385. 

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

  387.         return err;

  388. 

  389.     if (s->textfile) {

  390.         uint8_t *textbuf;

  391.         size_t textbuf_size;

  392. 

  393.         if (s->text) {

  394.             av_log(ctx, AV_LOG_ERROR,

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

  396.             return AVERROR(EINVAL);

  397.         }

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

  399.             av_log(ctx, AV_LOG_ERROR,

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

  401.                    s->textfile);

  402.             return err;

  403.         }

  404. 

  405.         if (textbuf_size > SIZE_MAX - 1 ||

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

  407.             av_file_unmap(textbuf, textbuf_size);

  408.             return AVERROR(ENOMEM);

  409.         }

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

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

  412.         av_file_unmap(textbuf, textbuf_size);

  413.     }

  414. 

  415.     if (!s->text) {

  416.         av_log(ctx, AV_LOG_ERROR,

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

  418.         return AVERROR(EINVAL);

  419.     }

  420. 

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

  422.         av_log(ctx, AV_LOG_ERROR,

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

  424.         return err;

  425.     }

  426. 

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

  428.         av_log(ctx, AV_LOG_ERROR,

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

  430.         return err;

  431.     }

  432. 

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

  434.         av_log(ctx, AV_LOG_ERROR,

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

  436.         return err;

  437.     }

  438. 

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

  440.         av_log(ctx, AV_LOG_ERROR,

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

  442.         return AVERROR(EINVAL);

  443.     }

  444. 

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

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

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

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

  449.         return AVERROR(EINVAL);

  450.     }

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

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

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

  454.         return AVERROR(EINVAL);

  455.     }

  456. 

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

  458. 

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

  460.     load_glyph(ctx, NULL, 0);

  461. 

  462.     /* set the tabsize in pixels */

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

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

  465.         return err;

  466.     }

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

  468. 

  469.     return 0;

  470. }

  471. 

  472. static int query_formats(AVFilterContext *ctx)

  473. {

  474.     static const enum AVPixelFormat pix_fmts[] = {

  475.         AV_PIX_FMT_ARGB,    AV_PIX_FMT_RGBA,

  476.         AV_PIX_FMT_ABGR,    AV_PIX_FMT_BGRA,

  477.         AV_PIX_FMT_RGB24,   AV_PIX_FMT_BGR24,

  478.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,

  479.         AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,

  480.         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,

  481.         AV_PIX_FMT_NONE

  482.     };

  483. 

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

  485.     return 0;

  486. }

  487. 

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

  489. {

  490.     av_free(elem);

  491.     return 0;

  492. }

  493. 

  494. static av_cold void uninit(AVFilterContext *ctx)

  495. {

  496.     DrawTextContext *s = ctx->priv;

  497.     int i;

  498. 

  499.     av_expr_free(s->x_pexpr);

  500.     av_expr_free(s->y_pexpr);

  501.     av_expr_free(s->d_pexpr);

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

  503.     av_freep(&s->expanded_text);

  504.     av_freep(&s->positions);

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

  506.     av_tree_destroy(s->glyphs);

  507.     s->glyphs = 0;

  508.     FT_Done_Face(s->face);

  509.     FT_Done_FreeType(s->library);

  510. 

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

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

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

  514.     }

  515. 

  516. }

  517. 

  518. static inline int is_newline(uint32_t c)

  519. {

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

  521. }

  522. 

  523. static int expand_strftime(DrawTextContext *s)

  524. {

  525.     struct tm ltime;

  526.     time_t now   = time(0);

  527.     uint8_t *buf = s->expanded_text;

  528.     int buf_size = s->expanded_text_size;

  529. 

  530.     if (!buf)

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

  532. 

  533.     localtime_r(&now, &ltime);

  534. 

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

  536.         *buf = 1;

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

  538.             break;

  539.         buf_size *= 2;

  540.     }

  541. 

  542.     if (!buf)

  543.         return AVERROR(ENOMEM);

  544.     s->expanded_text      = buf;

  545.     s->expanded_text_size = buf_size;

  546. 

  547.     return 0;

  548. }

  549. 

  550. static int dtext_prepare_text(AVFilterContext *ctx)

  551. {

  552.     DrawTextContext *s = ctx->priv;

  553.     uint32_t code = 0, prev_code = 0;

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

  555.     int text_height, baseline;

  556.     char *text;

  557.     uint8_t *p;

  558.     int str_w = 0, len;

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

  560.     FT_Vector delta;

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

  562.     Glyph dummy = { 0 };

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

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

  565. 

  566.     ret = expand_strftime(s);

  567.     if (ret < 0)

  568.         return ret;

  569. 

  570.     text = s->expanded_text ? s->expanded_text : s->text;

  571. 

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

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

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

  575.         if (!p) {

  576.             av_freep(s->positions);

  577.             s->nb_positions = 0;

  578.             return AVERROR(ENOMEM);

  579.         } else {

  580.             s->positions = p;

  581.             s->nb_positions = len;

  582.         }

  583.     }

  584. 

  585.     /* load and cache glyphs */

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

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

  588. 

  589.         /* get glyph */

  590.         dummy.code = code;

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

  592.         if (!glyph) {

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

  594.             if (ret)

  595.                 return ret;

  596.         }

  597. 

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

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

  600.     }

  601.     text_height = y_max - y_min;

  602.     baseline    = y_max;

  603. 

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

  605.     glyph = NULL;

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

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

  608. 

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

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

  611.             continue;

  612. 

  613.         prev_code = code;

  614.         if (is_newline(code)) {

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

  616.             y += text_height;

  617.             x = 0;

  618.             continue;

  619.         }

  620. 

  621.         /* get glyph */

  622.         prev_glyph = glyph;

  623.         dummy.code = code;

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

  625. 

  626.         /* kerning */

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

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

  629.                            ft_kerning_default, &delta);

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

  631.         }

  632. 

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

  634.             str_w = FFMAX(str_w, x);

  635.             y += text_height;

  636.             x = 0;

  637.         }

  638. 

  639.         /* save position */

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

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

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

  643.         else              x += glyph->advance;

  644.     }

  645. 

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

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

  648. 

  649.     s->w = str_w;

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

  651.     s->h = y;

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

  653. 

  654.     return 0;

  655. }

  656. 

  657. 

  658. static int config_input(AVFilterLink *inlink)

  659. {

  660.     AVFilterContext *ctx  = inlink->dst;

  661.     DrawTextContext *s = ctx->priv;

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

  663.     int ret;

  664. 

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

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

  667. 

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

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

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

  671. 

  672.     s->var_values[VAR_MAIN_W] =

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

  674.     s->var_values[VAR_MAIN_H] =

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

  676. 

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

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

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

  680. 

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

  682. 

  683.     av_expr_free(s->x_pexpr);

  684.     av_expr_free(s->y_pexpr);

  685.     av_expr_free(s->d_pexpr);

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

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

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

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

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

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

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

  693.         (ret = av_expr_parse(&s->a_pexpr, s->a_expr, var_names,

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

  695.         return AVERROR(EINVAL);

  696. 

  697.     if ((ret =

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

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

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

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

  702.         return ret;

  703. 

  704.     if (!s->is_packed_rgb) {

  705.         uint8_t *rgba = s->fontcolor_rgba;

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

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

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

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

  710.         rgba = s->shadowcolor_rgba;

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

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

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

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

  715.     }

  716. 

  717.     s->draw = 1;

  718. 

  719.     return dtext_prepare_text(ctx);

  720. }

  721. 

  722. #define GET_BITMAP_VAL(r, c)                                            \

  723.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  726. 

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

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

  729.     alpha = yuva_color[3] * alpha_mul * (val) * 129 / 255; \

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

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

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

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

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

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

  736.     }\

  737. }

  738. 

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

  740.                                  unsigned int y, unsigned int width, unsigned int height,

  741.                                  const uint8_t yuva_color[4], int hsub, int vsub,

  742.                                  int alpha_mul)

  743. {

  744.     int r, c, alpha;

  745.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  746.     uint8_t src_val;

  747. 

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

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

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

  751.             src_val = GET_BITMAP_VAL(r, c);

  752.             if (!src_val)

  753.                 continue;

  754. 

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

  756.         }

  757.     }

  758. 

  759.     return 0;

  760. }

  761. 

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

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

  764.     alpha = rgba_color[3] * alpha_mul * (val) * 129 / 255;                           \

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

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

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

  768. }

  769. 

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

  771.                                  unsigned int x, unsigned int y,

  772.                                  unsigned int width, unsigned int height, int pixel_step,

  773.                                  const uint8_t rgba_color[4], const uint8_t rgba_map[4],

  774.                                  int alpha_mul)

  775. {

  776.     int r, c, alpha;

  777.     uint8_t *p;

  778.     uint8_t src_val;

  779. 

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

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

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

  783.             src_val = GET_BITMAP_VAL(r, c);

  784.             if (!src_val)

  785.                 continue;

  786. 

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

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

  789.         }

  790.     }

  791. 

  792.     return 0;

  793. }

  794. 

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

  796.                            unsigned int width, unsigned int height,

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

  798.                            int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4],

  799.                            int alpha_mul)

  800. {

  801.     int i, j, alpha;

  802. 

  803.     if (color[3] != 0xFF || alpha_mul != 0xFF) {

  804.         if (is_rgba_packed) {

  805.             uint8_t *p;

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

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

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

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

  810.         } else {

  811.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  815.         }

  816.     } else {

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

  818.                           line, pixel_step, hsub, vsub,

  819.                           x, y, width, height);

  820.     }

  821. }

  822. 

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

  824.                        int width, int height,

  825.                        const uint8_t rgbcolor[4], const uint8_t yuvcolor[4],

  826.                        int x, int y)

  827. {

  828.     char *text = s->expanded_text;

  829.     uint32_t code = 0;

  830.     int i;

  831.     uint8_t *p;

  832.     Glyph *glyph = NULL;

  833. 

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

  835.         Glyph dummy = { 0 };

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

  837. 

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

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

  840.             continue;

  841. 

  842.         dummy.code = code;

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

  844. 

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

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

  847.             return AVERROR(EINVAL);

  848. 

  849.         if (s->is_packed_rgb) {

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

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

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

  853.         } else {

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

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

  856.                            yuvcolor, s->hsub, s->vsub, s->alpha);

  857.         }

  858.     }

  859. 

  860.     return 0;

  861. }

  862. 

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

  864.                      int width, int height)

  865. {

  866.     DrawTextContext *s = ctx->priv;

  867.     int ret;

  868. 

  869.     /* draw box */

  870.     if (s->draw_box)

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

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

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

  874.                 s->rgba_map, s->alpha);

  875. 

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

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

  878.                                s->shadowcolor_rgba,

  879.                                s->shadowcolor,

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

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

  882.             return ret;

  883.     }

  884. 

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

  886.                            s->fontcolor_rgba,

  887.                            s->fontcolor,

  888.                            s->x,

  889.                            s->y)) < 0)

  890.         return ret;

  891. 

  892.     return 0;

  893. }

  894. 

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

  896. {

  897.     int ret = 0;

  898. 

  899.     if (isnan(d)) {

  900.         ret = AVERROR(EINVAL);

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

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

  903.         ret = AVERROR(EINVAL);

  904.     } else

  905.         *n = round(d);

  906. 

  907.     return ret;

  908. }

  909. 

  910. static void update_alpha(DrawTextContext *s)

  911. {

  912.     double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng);

  913. 

  914.     if (isnan(alpha))

  915.         return;

  916. 

  917.     if (alpha >= 1.0)

  918.         s->alpha = 255;

  919.     else if (alpha <= 0)

  920.         s->alpha = 0;

  921.     else

  922.         s->alpha = 256 * alpha;

  923. }

  924. 

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

  926. {

  927.     AVFilterContext *ctx = inlink->dst;

  928.     DrawTextContext *s = ctx->priv;

  929.     int ret = 0;

  930. 

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

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

  933.         av_frame_free(&frame);

  934.         return ret;

  935.     }

  936. 

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

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

  939.     s->var_values[VAR_X] =

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

  941.     s->var_values[VAR_Y] =

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

  943.     s->var_values[VAR_X] =

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

  945. 

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

  947. 

  948.     update_alpha(s);

  949. 

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

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

  952. 

  953.     if (s->fix_bounds) {

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

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

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

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

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

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

  960.     }

  961. 

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

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

  964. 

  965.     av_log(ctx, AV_LOG_TRACE, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",

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

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

  968. 

  969.     if (s->draw)

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

  971. 

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

  973. 

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

  975. }

  976. 

  977. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  978.     {

  979.         .name             = "default",

  980.         .type             = AVMEDIA_TYPE_VIDEO,

  981.         .get_video_buffer = ff_null_get_video_buffer,

  982.         .filter_frame     = filter_frame,

  983.         .config_props     = config_input,

  984.         .needs_writable   = 1,

  985.     },

  986.     { NULL }

  987. };

  988. 

  989. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  990.     {

  991.         .name = "default",

  992.         .type = AVMEDIA_TYPE_VIDEO,

  993.     },

  994.     { NULL }

  995. };

  996. 

  997. AVFilter ff_vf_drawtext = {

  998.     .name          = "drawtext",

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

  1000.     .priv_size     = sizeof(DrawTextContext),

  1001.     .priv_class    = &drawtext_class,

  1002.     .init          = init,

  1003.     .uninit        = uninit,

  1004.     .query_formats = query_formats,

  1005. 

  1006.     .inputs    = avfilter_vf_drawtext_inputs,

  1007.     .outputs   = avfilter_vf_drawtext_outputs,

  1008. };