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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 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 FFmpeg 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/eval.h"

  34. #include "libavutil/file.h"

  35. #include "libavutil/opt.h"

  36. #include "libavutil/parseutils.h"

  37. #include "libavutil/pixdesc.h"

  38. #include "libavutil/tree.h"

  39. #include "avfilter.h"

  40. #include "drawutils.h"

  41. 

  42. #undef time

  43. 

  44. #include <ft2build.h>

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

  46. #include FT_FREETYPE_H

  47. #include FT_GLYPH_H

  48. 

  49. static const char *var_names[] = {

  50.     "E",

  51.     "PHI",

  52.     "PI",

  53.     "w",                      ///< width  of the input video

  54.     "h",                      ///< height of the input video

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

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

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

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

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

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

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

  62.     "sar",

  63.     "dar",

  64.     "hsub",

  65.     "vsub",

  66.     "x",

  67.     "y",

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

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

  70.     NULL

  71. };

  72. 

  73. enum var_name {

  74.     VAR_E,

  75.     VAR_PHI,

  76.     VAR_PI,

  77.     VAR_W,

  78.     VAR_H,

  79.     VAR_TW, VAR_TEXT_W,

  80.     VAR_TH, VAR_TEXT_H,

  81.     VAR_MAX_GLYPH_W,

  82.     VAR_MAX_GLYPH_H,

  83.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  84.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  85.     VAR_LINE_H, VAR_LH,

  86.     VAR_SAR,

  87.     VAR_DAR,

  88.     VAR_HSUB,

  89.     VAR_VSUB,

  90.     VAR_X,

  91.     VAR_Y,

  92.     VAR_N,

  93.     VAR_T,

  94.     VAR_VARS_NB

  95. };

  96. 

  97. typedef struct {

  98.     const AVClass *class;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  114.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  125. 

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

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

  128.     int tabsize;                    ///< tab size

  129. 

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

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

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

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

  134.     int is_packed_rgb;

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

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

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

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

  139.     double var_values[VAR_VARS_NB];

  140. } DrawTextContext;

  141. 

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

  143. 

  144. static const AVOption drawtext_options[]= {

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

  146. {"text",     "set text",             OFFSET(text),               FF_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX },

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

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

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

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

  151. {"box",      "set box",              OFFSET(draw_box),           FF_OPT_TYPE_INT,    {.dbl=0},     0,        1        },

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

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

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

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

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

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

  158. {"basetime", "set base time",        OFFSET(basetime),           FF_OPT_TYPE_INT64,  {.dbl=AV_NOPTS_VALUE},     INT64_MIN,        INT64_MAX  },

  159. 

  160. 

  161. /* FT_LOAD_* flags */

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

  163. {"default",                     "set default",                     0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_DEFAULT},                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  164. {"no_scale",                    "set no_scale",                    0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_SCALE},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  165. {"no_hinting",                  "set no_hinting",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_HINTING},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  166. {"render",                      "set render",                      0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_RENDER},                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  167. {"no_bitmap",                   "set no_bitmap",                   0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_BITMAP},                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  168. {"vertical_layout",             "set vertical_layout",             0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_VERTICAL_LAYOUT},             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  169. {"force_autohint",              "set force_autohint",              0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_FORCE_AUTOHINT},              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  170. {"crop_bitmap",                 "set crop_bitmap",                 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_CROP_BITMAP},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  171. {"pedantic",                    "set pedantic",                    0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_PEDANTIC},                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  172. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  173. {"no_recurse",                  "set no_recurse",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_RECURSE},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  174. {"ignore_transform",            "set ignore_transform",            0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_IGNORE_TRANSFORM},            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  175. {"monochrome",                  "set monochrome",                  0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_MONOCHROME},                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  176. {"linear_design",               "set linear_design",               0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_LINEAR_DESIGN},               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  177. {"no_autohint",                 "set no_autohint",                 0, FF_OPT_TYPE_CONST, {.dbl=FT_LOAD_NO_AUTOHINT},                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  178. {NULL},

  179. };

  180. 

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

  182. {

  183.     return "drawtext";

  184. }

  185. 

  186. static const AVClass drawtext_class = {

  187.     "DrawTextContext",

  188.     drawtext_get_name,

  189.     drawtext_options

  190. };

  191. 

  192. #undef __FTERRORS_H__

  193. #define FT_ERROR_START_LIST {

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

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

  196. 

  197. struct ft_error

  198. {

  199.     int err;

  200.     const char *err_msg;

  201. } static ft_errors[] =

  202. #include FT_ERRORS_H

  203. 

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

  205. 

  206. typedef struct {

  207.     FT_Glyph *glyph;

  208.     uint32_t code;

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

  210.     FT_BBox bbox;

  211.     int advance;

  212.     int bitmap_left;

  213.     int bitmap_top;

  214. } Glyph;

  215. 

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

  217. {

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

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

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

  221. }

  222. 

  223. /**

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

  225.  */

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

  227. {

  228.     DrawTextContext *dtext = ctx->priv;

  229.     Glyph *glyph;

  230.     struct AVTreeNode *node = NULL;

  231.     int ret;

  232. 

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

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

  235.         return AVERROR(EINVAL);

  236. 

  237.     /* save glyph */

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

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

  240.         ret = AVERROR(ENOMEM);

  241.         goto error;

  242.     }

  243.     glyph->code  = code;

  244. 

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

  246.         ret = AVERROR(EINVAL);

  247.         goto error;

  248.     }

  249. 

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

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

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

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

  254. 

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

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

  257. 

  258.     /* cache the newly created glyph */

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

  260.         ret = AVERROR(ENOMEM);

  261.         goto error;

  262.     }

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

  264. 

  265.     if (glyph_ptr)

  266.         *glyph_ptr = glyph;

  267.     return 0;

  268. 

  269. error:

  270.     if (glyph)

  271.         av_freep(&glyph->glyph);

  272.     av_freep(&glyph);

  273.     av_freep(&node);

  274.     return ret;

  275. }

  276. 

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

  278. {

  279.     int err;

  280.     DrawTextContext *dtext = ctx->priv;

  281.     Glyph *glyph;

  282. 

  283.     dtext->class = &drawtext_class;

  284.     av_opt_set_defaults(dtext);

  285. 

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

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

  288.         return err;

  289.     }

  290. 

  291.     if (!dtext->fontfile) {

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

  293.         return AVERROR(EINVAL);

  294.     }

  295. 

  296.     if (dtext->textfile) {

  297.         uint8_t *textbuf;

  298.         size_t textbuf_size;

  299. 

  300.         if (dtext->text) {

  301.             av_log(ctx, AV_LOG_ERROR,

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

  303.             return AVERROR(EINVAL);

  304.         }

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

  306.             av_log(ctx, AV_LOG_ERROR,

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

  308.                    dtext->textfile);

  309.             return err;

  310.         }

  311. 

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

  313.             return AVERROR(ENOMEM);

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

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

  316.         av_file_unmap(textbuf, textbuf_size);

  317.     }

  318. 

  319.     if (!dtext->text) {

  320.         av_log(ctx, AV_LOG_ERROR,

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

  322.         return AVERROR(EINVAL);

  323.     }

  324. 

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

  326.         av_log(ctx, AV_LOG_ERROR,

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

  328.         return err;

  329.     }

  330. 

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

  332.         av_log(ctx, AV_LOG_ERROR,

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

  334.         return err;

  335.     }

  336. 

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

  338.         av_log(ctx, AV_LOG_ERROR,

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

  340.         return err;

  341.     }

  342. 

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

  344.         av_log(ctx, AV_LOG_ERROR,

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

  346.         return AVERROR(EINVAL);

  347.     }

  348. 

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

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

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

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

  353.         return AVERROR(EINVAL);

  354.     }

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

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

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

  358.         return AVERROR(EINVAL);

  359.     }

  360. 

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

  362. 

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

  364.     load_glyph(ctx, NULL, 0);

  365. 

  366.     /* set the tabsize in pixels */

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

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

  369.         return err;

  370.     }

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

  372. 

  373.     return 0;

  374. }

  375. 

  376. static int query_formats(AVFilterContext *ctx)

  377. {

  378.     static const enum PixelFormat pix_fmts[] = {

  379.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  380.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  381.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  382.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  383.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  384.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  385.         PIX_FMT_NONE

  386.     };

  387. 

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

  389.     return 0;

  390. }

  391. 

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

  393. {

  394.     av_free(elem);

  395.     return 0;

  396. }

  397. 

  398. static av_cold void uninit(AVFilterContext *ctx)

  399. {

  400.     DrawTextContext *dtext = ctx->priv;

  401.     int i;

  402. 

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

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

  405. 

  406.     av_freep(&dtext->boxcolor_string);

  407.     av_freep(&dtext->expanded_text);

  408.     av_freep(&dtext->fontcolor_string);

  409.     av_freep(&dtext->fontfile);

  410.     av_freep(&dtext->shadowcolor_string);

  411.     av_freep(&dtext->text);

  412.     av_freep(&dtext->x_expr);

  413.     av_freep(&dtext->y_expr);

  414. 

  415.     av_freep(&dtext->positions);

  416.     dtext->nb_positions = 0;

  417. 

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

  419.     av_tree_destroy(dtext->glyphs);

  420.     dtext->glyphs = NULL;

  421. 

  422.     FT_Done_Face(dtext->face);

  423.     FT_Done_FreeType(dtext->library);

  424. 

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

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

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

  428.     }

  429. }

  430. 

  431. static int config_input(AVFilterLink *inlink)

  432. {

  433.     AVFilterContext *ctx = inlink->dst;

  434.     DrawTextContext *dtext = inlink->dst->priv;

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

  436.     int ret;

  437. 

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

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

  440. 

  441.     if ((ret =

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

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

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

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

  446.         return ret;

  447. 

  448.     if (!dtext->is_packed_rgb) {

  449.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  454.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  459.     }

  460. 

  461.     dtext->var_values[VAR_E]     = M_E;

  462.     dtext->var_values[VAR_PHI]   = M_PHI;

  463.     dtext->var_values[VAR_PI]    = M_PI;

  464.     dtext->var_values[VAR_W]     = inlink->w;

  465.     dtext->var_values[VAR_H]     = inlink->h;

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

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

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

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

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

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

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

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

  474. 

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

  476.                              NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||

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

  478.                              NULL, NULL, NULL, NULL, 0, ctx)) < 0)

  479.         return AVERROR(EINVAL);

  480. 

  481.     return 0;

  482. }

  483. 

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

  485. {

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

  487.         int ret;

  488.         uninit(ctx);

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

  490.             return ret;

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

  492.     }

  493. 

  494.     return AVERROR(ENOSYS);

  495. }

  496. 

  497. #define GET_BITMAP_VAL(r, c)                                            \

  498.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  501. 

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

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

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

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

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

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

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

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

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

  511.     }\

  512. }

  513. 

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

  515.                                  int x, int y, int width, int height,

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

  517. {

  518.     int r, c, alpha;

  519.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  520.     uint8_t src_val;

  521. 

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

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

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

  525.                 continue;

  526. 

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

  528.             src_val = GET_BITMAP_VAL(r, c);

  529.             if (!src_val)

  530.                 continue;

  531. 

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

  533.         }

  534.     }

  535. 

  536.     return 0;

  537. }

  538. 

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

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

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

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

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

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

  545. }

  546. 

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

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

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

  550. {

  551.     int r, c, alpha;

  552.     uint8_t *p;

  553.     uint8_t src_val;

  554. 

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

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

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

  558.                 continue;

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

  560.             src_val = GET_BITMAP_VAL(r, c);

  561.             if (!src_val)

  562.                 continue;

  563. 

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

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

  566.         }

  567.     }

  568. 

  569.     return 0;

  570. }

  571. 

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

  573.                            int width, int height,

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

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

  576. {

  577.     int i, j, alpha;

  578. 

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

  580.         if (is_rgba_packed) {

  581.             uint8_t *p;

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

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

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

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

  586.         } else {

  587.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  591.         }

  592.     } else {

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

  594.                           line, pixel_step, hsub, vsub,

  595.                           x, y, width, height);

  596.     }

  597. }

  598. 

  599. static inline int is_newline(uint32_t c)

  600. {

  601.     return (c == '\n' || c == '\r' || c == '\f' || c == '\v');

  602. }

  603. 

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

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

  606. {

  607.     char *text = dtext->expanded_text;

  608.     uint32_t code = 0;

  609.     int i, x1, y1;

  610.     uint8_t *p;

  611.     Glyph *glyph = NULL;

  612. 

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

  614.         Glyph dummy = { 0 };

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

  616. 

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

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

  619.             continue;

  620. 

  621.         dummy.code = code;

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

  623. 

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

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

  626.             return AVERROR(EINVAL);

  627. 

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

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

  630. 

  631.         if (dtext->is_packed_rgb) {

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

  633.                            x1, y1, width, height,

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

  635.         } else {

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

  637.                            x1, y1, width, height,

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

  639.         }

  640.     }

  641. 

  642.     return 0;

  643. }

  644. 

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

  646.                      int width, int height)

  647. {

  648.     DrawTextContext *dtext = ctx->priv;

  649.     uint32_t code = 0, prev_code = 0;

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

  651.     int max_text_line_w = 0, len;

  652.     int box_w, box_h;

  653.     char *text = dtext->text;

  654.     uint8_t *p;

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

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

  657.     FT_Vector delta;

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

  659.     Glyph dummy = { 0 };

  660. 

  661.     time_t now = time(0);

  662.     struct tm ltime;

  663.     uint8_t *buf = dtext->expanded_text;

  664.     int buf_size = dtext->expanded_text_size;

  665. 

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

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

  668. 

  669.     if (!buf) {

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

  671.         buf = av_malloc(buf_size);

  672.     }

  673. 

  674. #if HAVE_LOCALTIME_R

  675.     localtime_r(&now, &ltime);

  676. #else

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

  678.         ltime= *localtime(&now);

  679. #endif

  680. 

  681.     do {

  682.         *buf = 1;

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

  684.             break;

  685.         buf_size *= 2;

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

  687. 

  688.     if (!buf)

  689.         return AVERROR(ENOMEM);

  690.     text = dtext->expanded_text = buf;

  691.     dtext->expanded_text_size = buf_size;

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

  693.         if (!(dtext->positions =

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

  695.             return AVERROR(ENOMEM);

  696.         dtext->nb_positions = len;

  697.     }

  698. 

  699.     x = 0;

  700.     y = 0;

  701. 

  702.     /* load and cache glyphs */

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

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

  705. 

  706.         /* get glyph */

  707.         dummy.code = code;

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

  709.         if (!glyph)

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

  711. 

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

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

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

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

  716.     }

  717.     dtext->max_glyph_h = y_max - y_min;

  718.     dtext->max_glyph_w = x_max - x_min;

  719. 

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

  721.     glyph = NULL;

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

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

  724. 

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

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

  727.             continue;

  728. 

  729.         prev_code = code;

  730.         if (is_newline(code)) {

  731.             max_text_line_w = FFMAX(max_text_line_w, x);

  732.             y += dtext->max_glyph_h;

  733.             x = 0;

  734.             continue;

  735.         }

  736. 

  737.         /* get glyph */

  738.         prev_glyph = glyph;

  739.         dummy.code = code;

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

  741. 

  742.         /* kerning */

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

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

  745.                            ft_kerning_default, &delta);

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

  747.         }

  748. 

  749.         /* save position */

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

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

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

  753.         else              x += glyph->advance;

  754.     }

  755. 

  756.     max_text_line_w = FFMAX(x, max_text_line_w);

  757. 

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

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

  760. 

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

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

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

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

  765. 

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

  767. 

  768.     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, NULL);

  769.     dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, NULL);

  770.     dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, NULL);

  771. 

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

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

  774. 

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

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

  777. 

  778.     /* draw box */

  779.     if (dtext->draw_box)

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

  781.                 dtext->box_line, dtext->pixel_step, dtext->boxcolor_rgba,

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

  783. 

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

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

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

  787.             return ret;

  788.     }

  789. 

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

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

  792.         return ret;

  793. 

  794.     return 0;

  795. }

  796. 

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

  798. 

  799. static void end_frame(AVFilterLink *inlink)

  800. {

  801.     AVFilterContext *ctx = inlink->dst;

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

  803.     DrawTextContext *dtext = ctx->priv;

  804.     AVFilterBufferRef *picref = inlink->cur_buf;

  805. 

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

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

  808. 

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

  810. 

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

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

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

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

  815. 

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

  817. 

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

  819.     avfilter_end_frame(outlink);

  820. }

  821. 

  822. AVFilter avfilter_vf_drawtext = {

  823.     .name          = "drawtext",

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

  825.     .priv_size     = sizeof(DrawTextContext),

  826.     .init          = init,

  827.     .uninit        = uninit,

  828.     .query_formats = query_formats,

  829. 

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

  831.                                     .type             = AVMEDIA_TYPE_VIDEO,

  832.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  833.                                     .start_frame      = avfilter_null_start_frame,

  834.                                     .draw_slice       = null_draw_slice,

  835.                                     .end_frame        = end_frame,

  836.                                     .config_props     = config_input,

  837.                                     .min_perms        = AV_PERM_WRITE |

  838.                                                         AV_PERM_READ,

  839.                                     .rej_perms        = AV_PERM_PRESERVE },

  840.                                   { .name = NULL}},

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

  842.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  843.                                   { .name = NULL}},

  844.     .process_command = command,

  845. };