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FFmpeg/libavfilter/vf_drawtext.c

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  1. /*

  2.  * Copyright (c) 2011 Stefano Sabatini

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

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

  5.  *

  6.  * This file is part of Libav.

  7.  *

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

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

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

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

  12.  *

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

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

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

  16.  * Lesser General Public License for more details.

  17.  *

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

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

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

  21.  */

  22. 

  23. /**

  24.  * @file

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

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include <sys/time.h>

  30. #include <time.h>

  31. 

  32. #include "libavutil/colorspace.h"

  33. #include "libavutil/common.h"

  34. #include "libavutil/file.h"

  35. #include "libavutil/eval.h"

  36. #include "libavutil/opt.h"

  37. #include "libavutil/mathematics.h"

  38. #include "libavutil/random_seed.h"

  39. #include "libavutil/parseutils.h"

  40. #include "libavutil/pixdesc.h"

  41. #include "libavutil/tree.h"

  42. #include "libavutil/lfg.h"

  43. #include "avfilter.h"

  44. #include "drawutils.h"

  45. #include "formats.h"

  46. #include "internal.h"

  47. #include "video.h"

  48. 

  49. #include <ft2build.h>

  50. #include <freetype/config/ftheader.h>

  51. #include FT_FREETYPE_H

  52. #include FT_GLYPH_H

  53. 

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

  55.     "E",

  56.     "PHI",

  57.     "PI",

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

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

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

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

  62.     "x",

  63.     "y",

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

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

  66.     NULL

  67. };

  68. 

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

  70.     "rand"

  71. };

  72. 

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

  74. {

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

  76. }

  77. 

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

  79. 

  80. static const eval_func2 fun2[] = {

  81.     drand,

  82.     NULL

  83. };

  84. 

  85. enum var_name {

  86.     VAR_E,

  87.     VAR_PHI,

  88.     VAR_PI,

  89.     VAR_MAIN_W, VAR_MW,

  90.     VAR_MAIN_H, VAR_MH,

  91.     VAR_TEXT_W, VAR_TW,

  92.     VAR_TEXT_H, VAR_TH,

  93.     VAR_X,

  94.     VAR_Y,

  95.     VAR_N,

  96.     VAR_T,

  97.     VAR_VARS_NB

  98. };

  99. 

  100. typedef struct {

  101.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

  112.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  123. 

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

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

  126.     int tabsize;                    ///< tab size

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

  128. 

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

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

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

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

  133.     int is_packed_rgb;

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

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

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

  137.     char   *x_expr, *y_expr;

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

  139.     double var_values[VAR_VARS_NB];

  140.     char   *d_expr;

  141.     AVExpr *d_pexpr;

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

  143.     AVLFG  prng;                    ///< random

  144. } DrawTextContext;

  145. 

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

  147. #define FLAGS AV_OPT_FLAG_VIDEO_PARAM

  148. 

  149. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  166. 

  167.     /* FT_LOAD_* flags */

  168.     { "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" },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  184.     { NULL},

  185. };

  186. 

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

  188. {

  189.     return "drawtext";

  190. }

  191. 

  192. static const AVClass drawtext_class = {

  193.     "DrawTextContext",

  194.     drawtext_get_name,

  195.     drawtext_options

  196. };

  197. 

  198. #undef __FTERRORS_H__

  199. #define FT_ERROR_START_LIST {

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

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

  202. 

  203. struct ft_error

  204. {

  205.     int err;

  206.     const char *err_msg;

  207. } static ft_errors[] =

  208. #include FT_ERRORS_H

  209. 

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

  211. 

  212. typedef struct {

  213.     FT_Glyph *glyph;

  214.     uint32_t code;

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

  216.     FT_BBox bbox;

  217.     int advance;

  218.     int bitmap_left;

  219.     int bitmap_top;

  220. } Glyph;

  221. 

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

  223. {

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

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

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

  227. }

  228. 

  229. /**

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

  231.  */

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

  233. {

  234.     DrawTextContext *s = ctx->priv;

  235.     Glyph *glyph;

  236.     struct AVTreeNode *node = NULL;

  237.     int ret;

  238. 

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

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

  241.         return AVERROR(EINVAL);

  242. 

  243.     /* save glyph */

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

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

  246.         ret = AVERROR(ENOMEM);

  247.         goto error;

  248.     }

  249.     glyph->code  = code;

  250. 

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

  252.         ret = AVERROR(EINVAL);

  253.         goto error;

  254.     }

  255. 

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

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

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

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

  260. 

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

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

  263. 

  264.     /* cache the newly created glyph */

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

  266.         ret = AVERROR(ENOMEM);

  267.         goto error;

  268.     }

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

  270. 

  271.     if (glyph_ptr)

  272.         *glyph_ptr = glyph;

  273.     return 0;

  274. 

  275. error:

  276.     if (glyph)

  277.         av_freep(&glyph->glyph);

  278.     av_freep(&glyph);

  279.     av_freep(&node);

  280.     return ret;

  281. }

  282. 

  283. static av_cold int init(AVFilterContext *ctx)

  284. {

  285.     int err;

  286.     DrawTextContext *s = ctx->priv;

  287.     Glyph *glyph;

  288. 

  289.     if (!s->fontfile) {

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

  291.         return AVERROR(EINVAL);

  292.     }

  293. 

  294.     if (s->textfile) {

  295.         uint8_t *textbuf;

  296.         size_t textbuf_size;

  297. 

  298.         if (s->text) {

  299.             av_log(ctx, AV_LOG_ERROR,

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

  301.             return AVERROR(EINVAL);

  302.         }

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

  304.             av_log(ctx, AV_LOG_ERROR,

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

  306.                    s->textfile);

  307.             return err;

  308.         }

  309. 

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

  311.             return AVERROR(ENOMEM);

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

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

  314.         av_file_unmap(textbuf, textbuf_size);

  315.     }

  316. 

  317.     if (!s->text) {

  318.         av_log(ctx, AV_LOG_ERROR,

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

  320.         return AVERROR(EINVAL);

  321.     }

  322. 

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

  324.         av_log(ctx, AV_LOG_ERROR,

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

  326.         return err;

  327.     }

  328. 

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

  330.         av_log(ctx, AV_LOG_ERROR,

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

  332.         return err;

  333.     }

  334. 

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

  336.         av_log(ctx, AV_LOG_ERROR,

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

  338.         return err;

  339.     }

  340. 

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

  342.         av_log(ctx, AV_LOG_ERROR,

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

  344.         return AVERROR(EINVAL);

  345.     }

  346. 

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

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

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

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

  351.         return AVERROR(EINVAL);

  352.     }

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

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

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

  356.         return AVERROR(EINVAL);

  357.     }

  358. 

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

  360. 

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

  362.     load_glyph(ctx, NULL, 0);

  363. 

  364.     /* set the tabsize in pixels */

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

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

  367.         return err;

  368.     }

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

  370. 

  371. #if !HAVE_LOCALTIME_R

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

  373. #endif

  374. 

  375.     return 0;

  376. }

  377. 

  378. static int query_formats(AVFilterContext *ctx)

  379. {

  380.     static const enum AVPixelFormat pix_fmts[] = {

  381.         AV_PIX_FMT_ARGB,    AV_PIX_FMT_RGBA,

  382.         AV_PIX_FMT_ABGR,    AV_PIX_FMT_BGRA,

  383.         AV_PIX_FMT_RGB24,   AV_PIX_FMT_BGR24,

  384.         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P,

  385.         AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,

  386.         AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,

  387.         AV_PIX_FMT_NONE

  388.     };

  389. 

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

  391.     return 0;

  392. }

  393. 

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

  395. {

  396.     av_free(elem);

  397.     return 0;

  398. }

  399. 

  400. static av_cold void uninit(AVFilterContext *ctx)

  401. {

  402.     DrawTextContext *s = ctx->priv;

  403.     int i;

  404. 

  405.     av_expr_free(s->x_pexpr);

  406.     av_expr_free(s->y_pexpr);

  407.     av_expr_free(s->d_pexpr);

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

  409.     av_freep(&s->expanded_text);

  410.     av_freep(&s->positions);

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

  412.     av_tree_destroy(s->glyphs);

  413.     s->glyphs = 0;

  414.     FT_Done_Face(s->face);

  415.     FT_Done_FreeType(s->library);

  416. 

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

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

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

  420.     }

  421. 

  422. }

  423. 

  424. static inline int is_newline(uint32_t c)

  425. {

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

  427. }

  428. 

  429. static int dtext_prepare_text(AVFilterContext *ctx)

  430. {

  431.     DrawTextContext *s = ctx->priv;

  432.     uint32_t code = 0, prev_code = 0;

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

  434.     int text_height, baseline;

  435.     char *text = s->text;

  436.     uint8_t *p;

  437.     int str_w = 0, len;

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

  439.     FT_Vector delta;

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

  441.     Glyph dummy = { 0 };

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

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

  444. 

  445. #if HAVE_LOCALTIME_R

  446.     time_t now = time(0);

  447.     struct tm ltime;

  448.     uint8_t *buf = s->expanded_text;

  449.     int buf_size = s->expanded_text_size;

  450. 

  451.     if (!buf)

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

  453. 

  454.     localtime_r(&now, &ltime);

  455. 

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

  457.         *buf = 1;

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

  459.             break;

  460.         buf_size *= 2;

  461.     }

  462. 

  463.     if (!buf)

  464.         return AVERROR(ENOMEM);

  465.     text = s->expanded_text = buf;

  466.     s->expanded_text_size = buf_size;

  467. #endif

  468. 

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

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

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

  472.         if (!p) {

  473.             av_freep(s->positions);

  474.             s->nb_positions = 0;

  475.             return AVERROR(ENOMEM);

  476.         } else {

  477.             s->positions = p;

  478.             s->nb_positions = len;

  479.         }

  480.     }

  481. 

  482.     /* load and cache glyphs */

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

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

  485. 

  486.         /* get glyph */

  487.         dummy.code = code;

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

  489.         if (!glyph) {

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

  491.             if (ret)

  492.                 return ret;

  493.         }

  494. 

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

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

  497.     }

  498.     text_height = y_max - y_min;

  499.     baseline    = y_max;

  500. 

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

  502.     glyph = NULL;

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

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

  505. 

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

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

  508.             continue;

  509. 

  510.         prev_code = code;

  511.         if (is_newline(code)) {

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

  513.             y += text_height;

  514.             x = 0;

  515.             continue;

  516.         }

  517. 

  518.         /* get glyph */

  519.         prev_glyph = glyph;

  520.         dummy.code = code;

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

  522. 

  523.         /* kerning */

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

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

  526.                            ft_kerning_default, &delta);

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

  528.         }

  529. 

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

  531.             str_w = FFMAX(str_w, x);

  532.             y += text_height;

  533.             x = 0;

  534.         }

  535. 

  536.         /* save position */

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

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

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

  540.         else              x += glyph->advance;

  541.     }

  542. 

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

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

  545. 

  546.     s->w = str_w;

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

  548.     s->h = y;

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

  550. 

  551.     return 0;

  552. }

  553. 

  554. 

  555. static int config_input(AVFilterLink *inlink)

  556. {

  557.     AVFilterContext *ctx  = inlink->dst;

  558.     DrawTextContext *s = ctx->priv;

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

  560.     int ret;

  561. 

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

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

  564. 

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

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

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

  568. 

  569.     s->var_values[VAR_MAIN_W] =

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

  571.     s->var_values[VAR_MAIN_H] =

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

  573. 

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

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

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

  577. 

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

  579. 

  580.     av_expr_free(s->x_pexpr);

  581.     av_expr_free(s->y_pexpr);

  582.     av_expr_free(s->d_pexpr);

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

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

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

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

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

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

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

  590.         return AVERROR(EINVAL);

  591. 

  592.     if ((ret =

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

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

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

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

  597.         return ret;

  598. 

  599.     if (!s->is_packed_rgb) {

  600.         uint8_t *rgba = s->fontcolor_rgba;

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

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

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

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

  605.         rgba = s->shadowcolor_rgba;

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

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

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

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

  610.     }

  611. 

  612.     s->draw = 1;

  613. 

  614.     return dtext_prepare_text(ctx);

  615. }

  616. 

  617. #define GET_BITMAP_VAL(r, c)                                            \

  618.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  621. 

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

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

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

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

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

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

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

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

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

  631.     }\

  632. }

  633. 

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

  635.                                  unsigned int y, unsigned int width, unsigned int height,

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

  637. {

  638.     int r, c, alpha;

  639.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  640.     uint8_t src_val;

  641. 

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

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

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

  645.             src_val = GET_BITMAP_VAL(r, c);

  646.             if (!src_val)

  647.                 continue;

  648. 

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

  650.         }

  651.     }

  652. 

  653.     return 0;

  654. }

  655. 

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

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

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

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

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

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

  662. }

  663. 

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

  665.                                  unsigned int x, unsigned int y,

  666.                                  unsigned int width, unsigned int height, int pixel_step,

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

  668. {

  669.     int r, c, alpha;

  670.     uint8_t *p;

  671.     uint8_t src_val;

  672. 

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

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

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

  676.             src_val = GET_BITMAP_VAL(r, c);

  677.             if (!src_val)

  678.                 continue;

  679. 

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

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

  682.         }

  683.     }

  684. 

  685.     return 0;

  686. }

  687. 

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

  689.                            unsigned int width, unsigned int height,

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

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

  692. {

  693.     int i, j, alpha;

  694. 

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

  696.         if (is_rgba_packed) {

  697.             uint8_t *p;

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

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

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

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

  702.         } else {

  703.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  707.         }

  708.     } else {

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

  710.                           line, pixel_step, hsub, vsub,

  711.                           x, y, width, height);

  712.     }

  713. }

  714. 

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

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

  717. {

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

  719.     uint32_t code = 0;

  720.     int i;

  721.     uint8_t *p;

  722.     Glyph *glyph = NULL;

  723. 

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

  725.         Glyph dummy = { 0 };

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

  727. 

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

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

  730.             continue;

  731. 

  732.         dummy.code = code;

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

  734. 

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

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

  737.             return AVERROR(EINVAL);

  738. 

  739.         if (s->is_packed_rgb) {

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

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

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

  743.         } else {

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

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

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

  747.         }

  748.     }

  749. 

  750.     return 0;

  751. }

  752. 

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

  754.                      int width, int height)

  755. {

  756.     DrawTextContext *s = ctx->priv;

  757.     int ret;

  758. 

  759.     /* draw box */

  760.     if (s->draw_box)

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

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

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

  764.                 s->rgba_map);

  765. 

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

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

  768.                                s->shadowcolor_rgba,

  769.                                s->shadowcolor,

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

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

  772.             return ret;

  773.     }

  774. 

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

  776.                            s->fontcolor_rgba,

  777.                            s->fontcolor,

  778.                            s->x,

  779.                            s->y)) < 0)

  780.         return ret;

  781. 

  782.     return 0;

  783. }

  784. 

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

  786. {

  787.     int ret = 0;

  788. 

  789.     if (isnan(d)) {

  790.         ret = AVERROR(EINVAL);

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

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

  793.         ret = AVERROR(EINVAL);

  794.     } else

  795.         *n = round(d);

  796. 

  797.     return ret;

  798. }

  799. 

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

  801. {

  802.     AVFilterContext *ctx = inlink->dst;

  803.     DrawTextContext *s = ctx->priv;

  804.     int ret = 0;

  805. 

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

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

  808.         av_frame_free(&frame);

  809.         return ret;

  810.     }

  811. 

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

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

  814.     s->var_values[VAR_X] =

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

  816.     s->var_values[VAR_Y] =

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

  818.     s->var_values[VAR_X] =

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

  820. 

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

  822. 

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

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

  825. 

  826.     if (s->fix_bounds) {

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

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

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

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

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

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

  833.     }

  834. 

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

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

  837. 

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

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

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

  841. 

  842.     if (s->draw)

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

  844. 

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

  846. 

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

  848. }

  849. 

  850. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  851.     {

  852.         .name             = "default",

  853.         .type             = AVMEDIA_TYPE_VIDEO,

  854.         .get_video_buffer = ff_null_get_video_buffer,

  855.         .filter_frame     = filter_frame,

  856.         .config_props     = config_input,

  857.         .needs_writable   = 1,

  858.     },

  859.     { NULL }

  860. };

  861. 

  862. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  863.     {

  864.         .name = "default",

  865.         .type = AVMEDIA_TYPE_VIDEO,

  866.     },

  867.     { NULL }

  868. };

  869. 

  870. AVFilter ff_vf_drawtext = {

  871.     .name          = "drawtext",

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

  873.     .priv_size     = sizeof(DrawTextContext),

  874.     .priv_class    = &drawtext_class,

  875.     .init          = init,

  876.     .uninit        = uninit,

  877.     .query_formats = query_formats,

  878. 

  879.     .inputs    = avfilter_vf_drawtext_inputs,

  880.     .outputs   = avfilter_vf_drawtext_outputs,

  881. };