falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
37506 Commits
32 Branches
449MB
Tree: e96be8409f
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'e96be8409f'
${ noResults }
FFmpeg/libavfilter/vf_drawtext.c

898 lines
34KB
Raw Blame History 

  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 FFmpeg.

  7.  *

  8.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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 "config.h"

  33. #include "libavutil/avstring.h"

  34. #include "libavutil/colorspace.h"

  35. #include "libavutil/file.h"

  36. #include "libavutil/eval.h"

  37. #include "libavutil/opt.h"

  38. #include "libavutil/random_seed.h"

  39. #include "libavutil/parseutils.h"

  40. #include "libavutil/pixdesc.h"

  41. #include "libavutil/timecode.h"

  42. #include "libavutil/tree.h"

  43. #include "libavutil/lfg.h"

  44. #include "avfilter.h"

  45. #include "drawutils.h"

  46. 

  47. #undef time

  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.     "main_w", "w", "W",       ///< width  of the input video

  56.     "main_h", "h", "H",       ///< height of the input video

  57.     "tw", "text_w",           ///< width  of the rendered text

  58.     "th", "text_h",           ///< height of the rendered text

  59.     "max_glyph_w",            ///< max glyph width

  60.     "max_glyph_h",            ///< max glyph height

  61.     "max_glyph_a", "ascent",  ///< max glyph ascent

  62.     "max_glyph_d", "descent", ///< min glyph descent

  63.     "line_h", "lh",           ///< line height, same as max_glyph_h

  64.     "sar",

  65.     "dar",

  66.     "hsub",

  67.     "vsub",

  68.     "x",

  69.     "y",

  70.     "n",                      ///< number of frame

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

  72.     NULL

  73. };

  74. 

  75. static const char *fun2_names[] = {

  76.     "rand",

  77. };

  78. 

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

  80. {

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

  82. }

  83. 

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

  85. 

  86. static const eval_func2 fun2[] = {

  87.     drand,

  88.     NULL

  89. };

  90. 

  91. enum var_name {

  92.     VAR_MAIN_W, VAR_w, VAR_W,

  93.     VAR_MAIN_H, VAR_h, VAR_H,

  94.     VAR_TW, VAR_TEXT_W,

  95.     VAR_TH, VAR_TEXT_H,

  96.     VAR_MAX_GLYPH_W,

  97.     VAR_MAX_GLYPH_H,

  98.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  99.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  100.     VAR_LINE_H, VAR_LH,

  101.     VAR_SAR,

  102.     VAR_DAR,

  103.     VAR_HSUB,

  104.     VAR_VSUB,

  105.     VAR_X,

  106.     VAR_Y,

  107.     VAR_N,

  108.     VAR_T,

  109.     VAR_VARS_NB

  110. };

  111. 

  112. typedef struct {

  113.     const AVClass *class;

  114.     int reinit;                     ///< tells if the filter is being reinited

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

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

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

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

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

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

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

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

  123.     int x;                          ///< x position to start drawing text

  124.     int y;                          ///< y position to start drawing text

  125.     int max_glyph_w;                ///< max glyph width

  126.     int max_glyph_h;                ///< max glyph heigth

  127.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  138. 

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

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

  141.     int tabsize;                    ///< tab size

  142. 

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

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

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

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

  147.     int is_packed_rgb;

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

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

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

  151.     char *x_expr;                   ///< expression for x position

  152.     char *y_expr;                   ///< expression for y position

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

  154.     int64_t basetime;               ///< base pts time in the real world for display

  155.     double var_values[VAR_VARS_NB];

  156.     char   *d_expr;

  157.     AVExpr *d_pexpr;

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

  159.     AVLFG  prng;                    ///< random

  160.     char       *tc_opt_string;      ///< specified timecode option string

  161.     AVRational  tc_rate;            ///< frame rate for timecode

  162.     AVTimecode  tc;                 ///< timecode context

  163.     int frame_id;

  164. } DrawTextContext;

  165. 

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

  167. 

  168. static const AVOption drawtext_options[]= {

  169. {"fontfile", "set font file",        OFFSET(fontfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  170. {"text",     "set text",             OFFSET(text),               AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  171. {"textfile", "set text file",        OFFSET(textfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  172. {"fontcolor",   "set foreground color", OFFSET(fontcolor_string),   AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  173. {"boxcolor",    "set box color",        OFFSET(boxcolor_string),    AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX },

  174. {"shadowcolor", "set shadow color",     OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX },

  175. {"box",      "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.dbl=0},     0,        1        },

  176. {"fontsize", "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.dbl=16},    1,        INT_MAX  },

  177. {"x",        "set x expression",     OFFSET(x_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX },

  178. {"y",        "set y expression",     OFFSET(y_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX },

  179. {"shadowx",  "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  180. {"shadowy",  "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.dbl=0},     INT_MIN,  INT_MAX  },

  181. {"tabsize",  "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.dbl=4},     0,        INT_MAX  },

  182. {"basetime", "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.dbl=AV_NOPTS_VALUE},     INT64_MIN,        INT64_MAX  },

  183. {"draw",     "if false do not draw", OFFSET(d_expr),             AV_OPT_TYPE_STRING, {.str="1"},   CHAR_MIN, CHAR_MAX },

  184. {"timecode", "set initial timecode", OFFSET(tc_opt_string),      AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

  185. {"r",        "set rate (timecode only)", OFFSET(tc_rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },

  186. {"rate",     "set rate (timecode only)", OFFSET(tc_rate),        AV_OPT_TYPE_RATIONAL, {.dbl=0},          0,  INT_MAX },

  187. 

  188. /* FT_LOAD_* flags */

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

  190. {"default",                     "set default",                     0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  191. {"no_scale",                    "set no_scale",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  192. {"no_hinting",                  "set no_hinting",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  193. {"render",                      "set render",                      0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  194. {"no_bitmap",                   "set no_bitmap",                   0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  195. {"vertical_layout",             "set vertical_layout",             0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  196. {"force_autohint",              "set force_autohint",              0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  197. {"crop_bitmap",                 "set crop_bitmap",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  198. {"pedantic",                    "set pedantic",                    0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  199. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  200. {"no_recurse",                  "set no_recurse",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  201. {"ignore_transform",            "set ignore_transform",            0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  202. {"monochrome",                  "set monochrome",                  0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  203. {"linear_design",               "set linear_design",               0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  204. {"no_autohint",                 "set no_autohint",                 0, AV_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  205. {NULL},

  206. };

  207. 

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

  209. {

  210.     return "drawtext";

  211. }

  212. 

  213. static const AVClass drawtext_class = {

  214.     "DrawTextContext",

  215.     drawtext_get_name,

  216.     drawtext_options

  217. };

  218. 

  219. #undef __FTERRORS_H__

  220. #define FT_ERROR_START_LIST {

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

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

  223. 

  224. struct ft_error

  225. {

  226.     int err;

  227.     const char *err_msg;

  228. } static ft_errors[] =

  229. #include FT_ERRORS_H

  230. 

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

  232. 

  233. typedef struct {

  234.     FT_Glyph *glyph;

  235.     uint32_t code;

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

  237.     FT_BBox bbox;

  238.     int advance;

  239.     int bitmap_left;

  240.     int bitmap_top;

  241. } Glyph;

  242. 

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

  244. {

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

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

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

  248. }

  249. 

  250. /**

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

  252.  */

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

  254. {

  255.     DrawTextContext *dtext = ctx->priv;

  256.     Glyph *glyph;

  257.     struct AVTreeNode *node = NULL;

  258.     int ret;

  259. 

  260.     /* load glyph into dtext->face->glyph */

  261.     if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))

  262.         return AVERROR(EINVAL);

  263. 

  264.     /* save glyph */

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

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

  267.         ret = AVERROR(ENOMEM);

  268.         goto error;

  269.     }

  270.     glyph->code  = code;

  271. 

  272.     if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {

  273.         ret = AVERROR(EINVAL);

  274.         goto error;

  275.     }

  276. 

  277.     glyph->bitmap      = dtext->face->glyph->bitmap;

  278.     glyph->bitmap_left = dtext->face->glyph->bitmap_left;

  279.     glyph->bitmap_top  = dtext->face->glyph->bitmap_top;

  280.     glyph->advance     = dtext->face->glyph->advance.x >> 6;

  281. 

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

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

  284. 

  285.     /* cache the newly created glyph */

  286.     if (!(node = av_mallocz(av_tree_node_size))) {

  287.         ret = AVERROR(ENOMEM);

  288.         goto error;

  289.     }

  290.     av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);

  291. 

  292.     if (glyph_ptr)

  293.         *glyph_ptr = glyph;

  294.     return 0;

  295. 

  296. error:

  297.     if (glyph)

  298.         av_freep(&glyph->glyph);

  299.     av_freep(&glyph);

  300.     av_freep(&node);

  301.     return ret;

  302. }

  303. 

  304. static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)

  305. {

  306.     int err;

  307.     DrawTextContext *dtext = ctx->priv;

  308.     Glyph *glyph;

  309. 

  310.     dtext->class = &drawtext_class;

  311.     av_opt_set_defaults(dtext);

  312. 

  313.     if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {

  314.         av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);

  315.         return err;

  316.     }

  317. 

  318.     if (!dtext->fontfile) {

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

  320.         return AVERROR(EINVAL);

  321.     }

  322. 

  323.     if (dtext->textfile) {

  324.         uint8_t *textbuf;

  325.         size_t textbuf_size;

  326. 

  327.         if (dtext->text) {

  328.             av_log(ctx, AV_LOG_ERROR,

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

  330.             return AVERROR(EINVAL);

  331.         }

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

  333.             av_log(ctx, AV_LOG_ERROR,

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

  335.                    dtext->textfile);

  336.             return err;

  337.         }

  338. 

  339.         if (!(dtext->text = av_malloc(textbuf_size+1)))

  340.             return AVERROR(ENOMEM);

  341.         memcpy(dtext->text, textbuf, textbuf_size);

  342.         dtext->text[textbuf_size] = 0;

  343.         av_file_unmap(textbuf, textbuf_size);

  344.     }

  345. 

  346.     if (dtext->tc_opt_string) {

  347.         int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,

  348.                                                dtext->tc_opt_string, ctx);

  349.         if (ret < 0)

  350.             return ret;

  351.         if (!dtext->text)

  352.             dtext->text = av_strdup("");

  353.     }

  354. 

  355.     if (!dtext->text) {

  356.         av_log(ctx, AV_LOG_ERROR,

  357.                "Either text, a valid file or a timecode must be provided\n");

  358.         return AVERROR(EINVAL);

  359.     }

  360. 

  361.     if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {

  362.         av_log(ctx, AV_LOG_ERROR,

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

  364.         return err;

  365.     }

  366. 

  367.     if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {

  368.         av_log(ctx, AV_LOG_ERROR,

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

  370.         return err;

  371.     }

  372. 

  373.     if ((err = av_parse_color(dtext->shadowcolor_rgba, dtext->shadowcolor_string, -1, ctx))) {

  374.         av_log(ctx, AV_LOG_ERROR,

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

  376.         return err;

  377.     }

  378. 

  379.     if ((err = FT_Init_FreeType(&(dtext->library)))) {

  380.         av_log(ctx, AV_LOG_ERROR,

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

  382.         return AVERROR(EINVAL);

  383.     }

  384. 

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

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

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

  388.                dtext->fontfile, FT_ERRMSG(err));

  389.         return AVERROR(EINVAL);

  390.     }

  391.     if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {

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

  393.                dtext->fontsize, FT_ERRMSG(err));

  394.         return AVERROR(EINVAL);

  395.     }

  396. 

  397.     dtext->use_kerning = FT_HAS_KERNING(dtext->face);

  398. 

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

  400.     load_glyph(ctx, NULL, 0);

  401. 

  402.     /* set the tabsize in pixels */

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

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

  405.         return err;

  406.     }

  407.     dtext->tabsize *= glyph->advance;

  408. 

  409.     return 0;

  410. }

  411. 

  412. static int query_formats(AVFilterContext *ctx)

  413. {

  414.     static const enum PixelFormat pix_fmts[] = {

  415.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  416.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  417.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  418.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  419.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  420.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  421.         PIX_FMT_NONE

  422.     };

  423. 

  424.     avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));

  425.     return 0;

  426. }

  427. 

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

  429. {

  430.     av_free(elem);

  431.     return 0;

  432. }

  433. 

  434. static av_cold void uninit(AVFilterContext *ctx)

  435. {

  436.     DrawTextContext *dtext = ctx->priv;

  437.     int i;

  438. 

  439.     av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;

  440.     av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;

  441. 

  442.     av_freep(&dtext->boxcolor_string);

  443.     av_freep(&dtext->expanded_text);

  444.     av_freep(&dtext->fontcolor_string);

  445.     av_freep(&dtext->fontfile);

  446.     av_freep(&dtext->shadowcolor_string);

  447.     av_freep(&dtext->text);

  448.     av_freep(&dtext->x_expr);

  449.     av_freep(&dtext->y_expr);

  450. 

  451.     av_freep(&dtext->positions);

  452.     dtext->nb_positions = 0;

  453. 

  454.     av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);

  455.     av_tree_destroy(dtext->glyphs);

  456.     dtext->glyphs = NULL;

  457. 

  458.     FT_Done_Face(dtext->face);

  459.     FT_Done_FreeType(dtext->library);

  460. 

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

  462.         av_freep(&dtext->box_line[i]);

  463.         dtext->pixel_step[i] = 0;

  464.     }

  465. }

  466. 

  467. static inline int is_newline(uint32_t c)

  468. {

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

  470. }

  471. 

  472. static int config_input(AVFilterLink *inlink)

  473. {

  474.     AVFilterContext *ctx = inlink->dst;

  475.     DrawTextContext *dtext = ctx->priv;

  476.     const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];

  477.     int ret;

  478. 

  479.     dtext->hsub = pix_desc->log2_chroma_w;

  480.     dtext->vsub = pix_desc->log2_chroma_h;

  481. 

  482.     if ((ret =

  483.          ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,

  484.                                  inlink->w, dtext->boxcolor,

  485.                                  inlink->format, dtext->boxcolor_rgba,

  486.                                  &dtext->is_packed_rgb, dtext->rgba_map)) < 0)

  487.         return ret;

  488. 

  489.     if (!dtext->is_packed_rgb) {

  490.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

  494.         dtext->fontcolor[3] = rgba[3];

  495.         rgba = dtext->shadowcolor_rgba;

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

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

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

  499.         dtext->shadowcolor[3] = rgba[3];

  500.     }

  501. 

  502.     dtext->var_values[VAR_w]     = dtext->var_values[VAR_W]     = dtext->var_values[VAR_MAIN_W] = inlink->w;

  503.     dtext->var_values[VAR_h]     = dtext->var_values[VAR_H]     = dtext->var_values[VAR_MAIN_H] = inlink->h;

  504.     dtext->var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;

  505.     dtext->var_values[VAR_DAR]   = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];

  506.     dtext->var_values[VAR_HSUB]  = 1<<pix_desc->log2_chroma_w;

  507.     dtext->var_values[VAR_VSUB]  = 1<<pix_desc->log2_chroma_h;

  508.     dtext->var_values[VAR_X]     = NAN;

  509.     dtext->var_values[VAR_Y]     = NAN;

  510.     if (!dtext->reinit)

  511.         dtext->var_values[VAR_N] = 0;

  512.     dtext->var_values[VAR_T]     = NAN;

  513. 

  514.     av_lfg_init(&dtext->prng, av_get_random_seed());

  515. 

  516.     if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,

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

  518.         (ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,

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

  520.         (ret = av_expr_parse(&dtext->d_pexpr, dtext->d_expr, var_names,

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

  522. 

  523.         return AVERROR(EINVAL);

  524. 

  525.     return 0;

  526. }

  527. 

  528. static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)

  529. {

  530.     DrawTextContext *dtext = ctx->priv;

  531. 

  532.     if (!strcmp(cmd, "reinit")) {

  533.         int ret;

  534.         uninit(ctx);

  535.         dtext->reinit = 1;

  536.         if ((ret = init(ctx, arg, NULL)) < 0)

  537.             return ret;

  538.         return config_input(ctx->inputs[0]);

  539.     }

  540. 

  541.     return AVERROR(ENOSYS);

  542. }

  543. 

  544. #define GET_BITMAP_VAL(r, c)                                            \

  545.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  548. 

  549. #define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) {           \

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

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

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

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

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

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

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

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

  558.     }\

  559. }

  560. 

  561. static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap,

  562.                                  int x, int y, int width, int height,

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

  564. {

  565.     int r, c, alpha;

  566.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  567.     uint8_t src_val;

  568. 

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

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

  571.             if (c+x < 0 || r+y < 0)

  572.                 continue;

  573. 

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

  575.             src_val = GET_BITMAP_VAL(r, c);

  576.             if (!src_val)

  577.                 continue;

  578. 

  579.             SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);

  580.         }

  581.     }

  582. 

  583.     return 0;

  584. }

  585. 

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

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

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

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

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

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

  592. }

  593. 

  594. static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,

  595.                                  int x, int y, int width, int height, int pixel_step,

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

  597. {

  598.     int r, c, alpha;

  599.     uint8_t *p;

  600.     uint8_t src_val;

  601. 

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

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

  604.             if (c+x < 0 || r+y < 0)

  605.                 continue;

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

  607.             src_val = GET_BITMAP_VAL(r, c);

  608.             if (!src_val)

  609.                 continue;

  610. 

  611.             SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,

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

  613.         }

  614.     }

  615. 

  616.     return 0;

  617. }

  618. 

  619. static inline void drawbox(AVFilterBufferRef *picref, int x, int y,

  620.                            int width, int height,

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

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

  623. {

  624.     int i, j, alpha;

  625. 

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

  627.         if (is_rgba_packed) {

  628.             uint8_t *p;

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

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

  631.                     SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],

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

  633.         } else {

  634.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

  637.                     SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);

  638.         }

  639.     } else {

  640.         ff_draw_rectangle(picref->data, picref->linesize,

  641.                           line, pixel_step, hsub, vsub,

  642.                           x, y, width, height);

  643.     }

  644. }

  645. 

  646. static int draw_glyphs(DrawTextContext *dtext, AVFilterBufferRef *picref,

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

  648. {

  649.     char *text = dtext->expanded_text;

  650.     uint32_t code = 0;

  651.     int i, x1, y1;

  652.     uint8_t *p;

  653.     Glyph *glyph = NULL;

  654. 

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

  656.         Glyph dummy = { 0 };

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

  658. 

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

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

  661.             continue;

  662. 

  663.         dummy.code = code;

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

  665. 

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

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

  668.             return AVERROR(EINVAL);

  669. 

  670.         x1 = dtext->positions[i].x+dtext->x+x;

  671.         y1 = dtext->positions[i].y+dtext->y+y;

  672. 

  673.         if (dtext->is_packed_rgb) {

  674.             draw_glyph_rgb(picref, &glyph->bitmap,

  675.                            x1, y1, width, height,

  676.                            dtext->pixel_step[0], rgbcolor, dtext->rgba_map);

  677.         } else {

  678.             draw_glyph_yuv(picref, &glyph->bitmap,

  679.                            x1, y1, width, height,

  680.                            yuvcolor, dtext->hsub, dtext->vsub);

  681.         }

  682.     }

  683. 

  684.     return 0;

  685. }

  686. 

  687. static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,

  688.                      int width, int height)

  689. {

  690.     DrawTextContext *dtext = ctx->priv;

  691.     uint32_t code = 0, prev_code = 0;

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

  693.     int max_text_line_w = 0, len;

  694.     int box_w, box_h;

  695.     char *text = dtext->text;

  696.     uint8_t *p;

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

  698.     int x_min = 32000, x_max = -32000;

  699.     FT_Vector delta;

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

  701.     Glyph dummy = { 0 };

  702. 

  703.     time_t now = time(0);

  704.     struct tm ltime;

  705.     uint8_t *buf = dtext->expanded_text;

  706.     int buf_size = dtext->expanded_text_size;

  707. 

  708.     if(dtext->basetime != AV_NOPTS_VALUE)

  709.         now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;

  710. 

  711.     if (!buf) {

  712.         buf_size = 2*strlen(dtext->text)+1;

  713.         buf = av_malloc(buf_size);

  714.     }

  715. 

  716. #if HAVE_LOCALTIME_R

  717.     localtime_r(&now, &ltime);

  718. #else

  719.     if(strchr(dtext->text, '%'))

  720.         ltime= *localtime(&now);

  721. #endif

  722. 

  723.     do {

  724.         *buf = 1;

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

  726.             break;

  727.         buf_size *= 2;

  728.     } while ((buf = av_realloc(buf, buf_size)));

  729. 

  730.     if (dtext->tc_opt_string) {

  731.         char tcbuf[AV_TIMECODE_STR_SIZE];

  732.         av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);

  733.         buf = av_asprintf("%s%s", dtext->text, tcbuf);

  734.     }

  735. 

  736.     if (!buf)

  737.         return AVERROR(ENOMEM);

  738.     text = dtext->expanded_text = buf;

  739.     dtext->expanded_text_size = buf_size;

  740.     if ((len = strlen(text)) > dtext->nb_positions) {

  741.         if (!(dtext->positions =

  742.               av_realloc(dtext->positions, len*sizeof(*dtext->positions))))

  743.             return AVERROR(ENOMEM);

  744.         dtext->nb_positions = len;

  745.     }

  746. 

  747.     x = 0;

  748.     y = 0;

  749. 

  750.     /* load and cache glyphs */

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

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

  753. 

  754.         /* get glyph */

  755.         dummy.code = code;

  756.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  757.         if (!glyph)

  758.             load_glyph(ctx, &glyph, code);

  759. 

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

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

  762.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  763.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  764.     }

  765.     dtext->max_glyph_h = y_max - y_min;

  766.     dtext->max_glyph_w = x_max - x_min;

  767. 

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

  769.     glyph = NULL;

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

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

  772. 

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

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

  775.             continue;

  776. 

  777.         prev_code = code;

  778.         if (is_newline(code)) {

  779.             max_text_line_w = FFMAX(max_text_line_w, x);

  780.             y += dtext->max_glyph_h;

  781.             x = 0;

  782.             continue;

  783.         }

  784. 

  785.         /* get glyph */

  786.         prev_glyph = glyph;

  787.         dummy.code = code;

  788.         glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);

  789. 

  790.         /* kerning */

  791.         if (dtext->use_kerning && prev_glyph && glyph->code) {

  792.             FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,

  793.                            ft_kerning_default, &delta);

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

  795.         }

  796. 

  797.         /* save position */

  798.         dtext->positions[i].x = x + glyph->bitmap_left;

  799.         dtext->positions[i].y = y - glyph->bitmap_top + y_max;

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

  801.         else              x += glyph->advance;

  802.     }

  803. 

  804.     max_text_line_w = FFMAX(x, max_text_line_w);

  805. 

  806.     dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;

  807.     dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;

  808. 

  809.     dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;

  810.     dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;

  811.     dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;

  812.     dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;

  813. 

  814.     dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;

  815. 

  816.     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);

  817.     dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);

  818.     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);

  819.     dtext->draw = av_expr_eval(dtext->d_pexpr, dtext->var_values, &dtext->prng);

  820. 

  821.     if(!dtext->draw)

  822.         return 0;

  823. 

  824.     dtext->x &= ~((1 << dtext->hsub) - 1);

  825.     dtext->y &= ~((1 << dtext->vsub) - 1);

  826. 

  827.     box_w = FFMIN(width - 1 , max_text_line_w);

  828.     box_h = FFMIN(height - 1, y + dtext->max_glyph_h);

  829. 

  830.     /* draw box */

  831.     if (dtext->draw_box)

  832.         drawbox(picref, dtext->x, dtext->y, box_w, box_h,

  833.                 dtext->box_line, dtext->pixel_step, dtext->is_packed_rgb ? dtext->boxcolor_rgba : dtext->boxcolor,

  834.                 dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);

  835. 

  836.     if (dtext->shadowx || dtext->shadowy) {

  837.         if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba,

  838.                                dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)

  839.             return ret;

  840.     }

  841. 

  842.     if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba,

  843.                            dtext->fontcolor, 0, 0)) < 0)

  844.         return ret;

  845. 

  846.     return 0;

  847. }

  848. 

  849. static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }

  850. 

  851. static void end_frame(AVFilterLink *inlink)

  852. {

  853.     AVFilterContext *ctx = inlink->dst;

  854.     AVFilterLink *outlink = ctx->outputs[0];

  855.     DrawTextContext *dtext = ctx->priv;

  856.     AVFilterBufferRef *picref = inlink->cur_buf;

  857. 

  858.     dtext->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?

  859.         NAN : picref->pts * av_q2d(inlink->time_base);

  860. 

  861.     draw_text(ctx, picref, picref->video->w, picref->video->h);

  862. 

  863.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  864.            (int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],

  865.            (int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],

  866.            dtext->x, dtext->y);

  867. 

  868.     dtext->var_values[VAR_N] += 1.0;

  869. 

  870.     avfilter_draw_slice(outlink, 0, picref->video->h, 1);

  871.     avfilter_end_frame(outlink);

  872. }

  873. 

  874. AVFilter avfilter_vf_drawtext = {

  875.     .name          = "drawtext",

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

  877.     .priv_size     = sizeof(DrawTextContext),

  878.     .init          = init,

  879.     .uninit        = uninit,

  880.     .query_formats = query_formats,

  881. 

  882.     .inputs    = (const AVFilterPad[]) {{ .name       = "default",

  883.                                     .type             = AVMEDIA_TYPE_VIDEO,

  884.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  885.                                     .start_frame      = avfilter_null_start_frame,

  886.                                     .draw_slice       = null_draw_slice,

  887.                                     .end_frame        = end_frame,

  888.                                     .config_props     = config_input,

  889.                                     .min_perms        = AV_PERM_WRITE |

  890.                                                         AV_PERM_READ,

  891.                                     .rej_perms        = AV_PERM_PRESERVE },

  892.                                   { .name = NULL}},

  893.     .outputs   = (const AVFilterPad[]) {{ .name       = "default",

  894.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  895.                                   { .name = NULL}},

  896.     .process_command = command,

  897. };