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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/file.h"

  34. #include "libavutil/opt.h"

  35. #include "libavutil/parseutils.h"

  36. #include "libavutil/pixdesc.h"

  37. #include "libavutil/tree.h"

  38. #include "avfilter.h"

  39. #include "drawutils.h"

  40. 

  41. #undef time

  42. 

  43. #include <ft2build.h>

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

  45. #include FT_FREETYPE_H

  46. #include FT_GLYPH_H

  47. 

  48. #define MAX_EXPANDED_TEXT_SIZE 2048

  49. 

  50. typedef struct {

  51.     const AVClass *class;

  52.     char *fontfile;                 ///< font to be used

  53.     char *text;                     ///< text to be drawn

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

  55.     /** buffer containing the text expanded by strftime */

  56.     char expanded_text[MAX_EXPANDED_TEXT_SIZE];

  57.     /** positions for each element in the text */

  58.     FT_Vector positions[MAX_EXPANDED_TEXT_SIZE];

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

  60.     unsigned int x;                 ///< x position to start drawing text

  61.     unsigned int y;                 ///< y position to start drawing text

  62.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  73. 

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

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

  76.     int tabsize;                    ///< tab size

  77. 

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

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

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

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

  82.     int is_packed_rgb;

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

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

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

  86. } DrawTextContext;

  87. 

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

  89. 

  90. static const AVOption drawtext_options[]= {

  91. {"fontfile", "set font file",        OFFSET(fontfile),         FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },

  92. {"text",     "set text",             OFFSET(text),             FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },

  93. {"textfile", "set text file",        OFFSET(textfile),         FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },

  94. {"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },

  95. {"boxcolor", "set box color",        OFFSET(boxcolor_string),  FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },

  96. {"shadowcolor", "set shadow color",  OFFSET(shadowcolor_string),  FF_OPT_TYPE_STRING, 0,  CHAR_MIN, CHAR_MAX },

  97. {"box",      "set box",              OFFSET(draw_box),         FF_OPT_TYPE_INT,    0,         0,        1 },

  98. {"fontsize", "set font size",        OFFSET(fontsize),         FF_OPT_TYPE_INT,   16,         1,       72 },

  99. {"x",        "set x",                OFFSET(x),                FF_OPT_TYPE_INT,    0,         0,  INT_MAX },

  100. {"y",        "set y",                OFFSET(y),                FF_OPT_TYPE_INT,    0,         0,  INT_MAX },

  101. {"shadowx",  "set x",                OFFSET(shadowx),          FF_OPT_TYPE_INT,    0,         0,  INT_MAX },

  102. {"shadowy",  "set y",                OFFSET(shadowy),          FF_OPT_TYPE_INT,    0,         0,  INT_MAX },

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

  104. 

  105. /* FT_LOAD_* flags */

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

  107. {"default",                     "set default",                     0, FF_OPT_TYPE_CONST, FT_LOAD_DEFAULT,                     INT_MIN, INT_MAX, 0, "ft_load_flags" },

  108. {"no_scale",                    "set no_scale",                    0, FF_OPT_TYPE_CONST, FT_LOAD_NO_SCALE,                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  109. {"no_hinting",                  "set no_hinting",                  0, FF_OPT_TYPE_CONST, FT_LOAD_NO_HINTING,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  110. {"render",                      "set render",                      0, FF_OPT_TYPE_CONST, FT_LOAD_RENDER,                      INT_MIN, INT_MAX, 0, "ft_load_flags" },

  111. {"no_bitmap",                   "set no_bitmap",                   0, FF_OPT_TYPE_CONST, FT_LOAD_NO_BITMAP,                   INT_MIN, INT_MAX, 0, "ft_load_flags" },

  112. {"vertical_layout",             "set vertical_layout",             0, FF_OPT_TYPE_CONST, FT_LOAD_VERTICAL_LAYOUT,             INT_MIN, INT_MAX, 0, "ft_load_flags" },

  113. {"force_autohint",              "set force_autohint",              0, FF_OPT_TYPE_CONST, FT_LOAD_FORCE_AUTOHINT,              INT_MIN, INT_MAX, 0, "ft_load_flags" },

  114. {"crop_bitmap",                 "set crop_bitmap",                 0, FF_OPT_TYPE_CONST, FT_LOAD_CROP_BITMAP,                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  115. {"pedantic",                    "set pedantic",                    0, FF_OPT_TYPE_CONST, FT_LOAD_PEDANTIC,                    INT_MIN, INT_MAX, 0, "ft_load_flags" },

  116. {"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH, INT_MIN, INT_MAX, 0, "ft_load_flags" },

  117. {"no_recurse",                  "set no_recurse",                  0, FF_OPT_TYPE_CONST, FT_LOAD_NO_RECURSE,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  118. {"ignore_transform",            "set ignore_transform",            0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_TRANSFORM,            INT_MIN, INT_MAX, 0, "ft_load_flags" },

  119. {"monochrome",                  "set monochrome",                  0, FF_OPT_TYPE_CONST, FT_LOAD_MONOCHROME,                  INT_MIN, INT_MAX, 0, "ft_load_flags" },

  120. {"linear_design",               "set linear_design",               0, FF_OPT_TYPE_CONST, FT_LOAD_LINEAR_DESIGN,               INT_MIN, INT_MAX, 0, "ft_load_flags" },

  121. {"no_autohint",                 "set no_autohint",                 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_AUTOHINT,                 INT_MIN, INT_MAX, 0, "ft_load_flags" },

  122. {NULL},

  123. };

  124. 

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

  126. {

  127.     return "drawtext";

  128. }

  129. 

  130. static const AVClass drawtext_class = {

  131.     "DrawTextContext",

  132.     drawtext_get_name,

  133.     drawtext_options

  134. };

  135. 

  136. #undef __FTERRORS_H__

  137. #define FT_ERROR_START_LIST {

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

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

  140. 

  141. struct ft_error

  142. {

  143.     int err;

  144.     const char *err_msg;

  145. } static ft_errors[] =

  146. #include FT_ERRORS_H

  147. 

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

  149. 

  150. typedef struct {

  151.     FT_Glyph *glyph;

  152.     uint32_t code;

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

  154.     FT_BBox bbox;

  155.     int advance;

  156.     int bitmap_left;

  157.     int bitmap_top;

  158. } Glyph;

  159. 

  160. static int glyph_cmp(const Glyph *a, const Glyph *b)

  161. {

  162.     int64_t diff = (int64_t)a->code - (int64_t)b->code;

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

  164. }

  165. 

  166. /**

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

  168.  */

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

  170. {

  171.     DrawTextContext *dtext = ctx->priv;

  172.     Glyph *glyph = av_mallocz(sizeof(Glyph));

  173.     struct AVTreeNode *node = NULL;

  174.     int ret;

  175. 

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

  177.     ret = FT_Load_Char(dtext->face, code, dtext->ft_load_flags);

  178.     if (ret)

  179.         return AVERROR(EINVAL);

  180. 

  181.     /* save glyph */

  182.     glyph->code  = code;

  183.     glyph->glyph = av_mallocz(sizeof(FT_Glyph));

  184.     ret = FT_Get_Glyph(dtext->face->glyph, glyph->glyph);

  185.     if (ret)

  186.         return AVERROR(EINVAL);

  187. 

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

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

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

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

  192. 

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

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

  195. 

  196.     /* cache the newly created glyph */

  197.     if (!node)

  198.         node = av_mallocz(av_tree_node_size);

  199.     av_tree_insert(&dtext->glyphs, glyph, (void *)glyph_cmp, &node);

  200. 

  201.     if (glyph_ptr)

  202.         *glyph_ptr = glyph;

  203.     return 0;

  204. }

  205. 

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

  207. {

  208.     int err;

  209.     DrawTextContext *dtext = ctx->priv;

  210. 

  211.     dtext->class = &drawtext_class;

  212.     av_opt_set_defaults2(dtext, 0, 0);

  213.     dtext->fontcolor_string = av_strdup("black");

  214.     dtext->boxcolor_string = av_strdup("white");

  215.     dtext->shadowcolor_string = av_strdup("black");

  216. 

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

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

  219.         return err;

  220.     }

  221. 

  222.     if (!dtext->fontfile) {

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

  224.         return AVERROR(EINVAL);

  225.     }

  226. 

  227.     if (dtext->textfile) {

  228.         uint8_t *textbuf;

  229.         size_t textbuf_size;

  230. 

  231.         if (dtext->text) {

  232.             av_log(ctx, AV_LOG_ERROR,

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

  234.             return AVERROR(EINVAL);

  235.         }

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

  237.             av_log(ctx, AV_LOG_ERROR,

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

  239.                    dtext->textfile);

  240.             return err;

  241.         }

  242. 

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

  244.             return AVERROR(ENOMEM);

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

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

  247.         av_file_unmap(textbuf, textbuf_size);

  248.     }

  249. 

  250.     if (!dtext->text) {

  251.         av_log(ctx, AV_LOG_ERROR,

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

  253.         return AVERROR(EINVAL);

  254.     }

  255. 

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

  257.         av_log(ctx, AV_LOG_ERROR,

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

  259.         return err;

  260.     }

  261. 

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

  263.         av_log(ctx, AV_LOG_ERROR,

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

  265.         return err;

  266.     }

  267. 

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

  269.         av_log(ctx, AV_LOG_ERROR,

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

  271.         return err;

  272.     }

  273. 

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

  275.         av_log(ctx, AV_LOG_ERROR,

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

  277.         return AVERROR(EINVAL);

  278.     }

  279. 

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

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

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

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

  284.         return AVERROR(EINVAL);

  285.     }

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

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

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

  289.         return AVERROR(EINVAL);

  290.     }

  291. 

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

  293. 

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

  295.     load_glyph(ctx, NULL, 0);

  296. 

  297. #if !HAVE_LOCALTIME_R

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

  299. #else

  300.     if (strlen(dtext->text) >= MAX_EXPANDED_TEXT_SIZE) {

  301.         av_log(ctx, AV_LOG_ERROR,

  302.                "Impossible to print text, string is too big\n");

  303.         return AVERROR(EINVAL);

  304.     }

  305. #endif

  306. 

  307.     return 0;

  308. }

  309. 

  310. static int query_formats(AVFilterContext *ctx)

  311. {

  312.     static const enum PixelFormat pix_fmts[] = {

  313.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  314.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  315.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  316.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  317.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  318.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  319.         PIX_FMT_NONE

  320.     };

  321. 

  322.     avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));

  323.     return 0;

  324. }

  325. 

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

  327. {

  328.     av_free(elem);

  329.     return 0;

  330. }

  331. 

  332. static av_cold void uninit(AVFilterContext *ctx)

  333. {

  334.     DrawTextContext *dtext = ctx->priv;

  335.     int i;

  336. 

  337.     av_freep(&dtext->fontfile);

  338.     av_freep(&dtext->text);

  339.     av_freep(&dtext->fontcolor_string);

  340.     av_freep(&dtext->boxcolor_string);

  341.     av_freep(&dtext->shadowcolor_string);

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

  343.     av_tree_destroy(dtext->glyphs);

  344.     dtext->glyphs = 0;

  345.     FT_Done_Face(dtext->face);

  346.     FT_Done_FreeType(dtext->library);

  347. 

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

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

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

  351.     }

  352. 

  353. }

  354. 

  355. static int config_input(AVFilterLink *inlink)

  356. {

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

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

  359.     int ret;

  360. 

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

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

  363. 

  364.     if ((ret =

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

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

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

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

  369.         return ret;

  370. 

  371.     if (!dtext->is_packed_rgb) {

  372.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  377.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  382.     }

  383. 

  384.     return 0;

  385. }

  386. 

  387. #define GET_BITMAP_VAL(r, c)                                            \

  388.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  391. 

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

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

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

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

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

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

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

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

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

  401.     }\

  402. }

  403. 

  404. static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,

  405.                                  unsigned int y, unsigned int width, unsigned int height,

  406.                                  unsigned char yuva_color[4], int hsub, int vsub)

  407. {

  408.     int r, c, alpha;

  409.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  410.     uint8_t src_val, dst_pixel[4];

  411. 

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

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

  414.             /* get pixel in the picref (destination) */

  415.             dst_pixel[0] = picref->data[0][  c+x           +  (y+r)          * picref->linesize[0]];

  416.             dst_pixel[1] = picref->data[1][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[1]];

  417.             dst_pixel[2] = picref->data[2][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[2]];

  418. 

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

  420.             src_val = GET_BITMAP_VAL(r, c);

  421.             if (!src_val)

  422.                 continue;

  423. 

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

  425.         }

  426.     }

  427. 

  428.     return 0;

  429. }

  430. 

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

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

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

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

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

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

  437. }

  438. 

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

  440.                                  unsigned int x, unsigned int y,

  441.                                  unsigned int width, unsigned int height, int pixel_step,

  442.                                  unsigned char rgba_color[4], uint8_t rgba_map[4])

  443. {

  444.     int r, c, alpha;

  445.     uint8_t *p;

  446.     uint8_t src_val, dst_pixel[4];

  447. 

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

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

  450.             /* get pixel in the picref (destination) */

  451.             dst_pixel[0] = picref->data[0][(c+x + rgba_map[0]) * pixel_step +

  452.                                            (y+r) * picref->linesize[0]];

  453.             dst_pixel[1] = picref->data[0][(c+x + rgba_map[1]) * pixel_step +

  454.                                            (y+r) * picref->linesize[0]];

  455.             dst_pixel[2] = picref->data[0][(c+x + rgba_map[2]) * pixel_step +

  456.                                            (y+r) * picref->linesize[0]];

  457. 

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

  459.             src_val = GET_BITMAP_VAL(r, c);

  460.             if (!src_val)

  461.                 continue;

  462. 

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

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

  465.         }

  466.     }

  467. 

  468.     return 0;

  469. }

  470. 

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

  472.                            unsigned int width, unsigned int height,

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

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

  475. {

  476.     int i, j, alpha;

  477. 

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

  479.         if (is_rgba_packed) {

  480.             uint8_t *p;

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

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

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

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

  485.         } else {

  486.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  490.         }

  491.     } else {

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

  493.                           line, pixel_step, hsub, vsub,

  494.                           x, y, width, height);

  495.     }

  496. }

  497. 

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

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

  500. {

  501.     char *text = HAVE_LOCALTIME_R ? dtext->expanded_text : dtext->text;

  502.     uint32_t code = 0;

  503.     int i;

  504.     uint8_t *p;

  505.     Glyph *glyph = NULL;

  506. 

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

  508.         Glyph dummy = { 0 };

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

  510. 

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

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

  513.             continue;

  514. 

  515.         dummy.code = code;

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

  517. 

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

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

  520.             return AVERROR(EINVAL);

  521. 

  522.         if (dtext->is_packed_rgb) {

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

  524.                            dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,

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

  526.         } else {

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

  528.                            dtext->positions[i].x+x, dtext->positions[i].y+y, width, height,

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

  530.         }

  531.     }

  532. 

  533.     return 0;

  534. }

  535. 

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

  537.                      int width, int height)

  538. {

  539.     DrawTextContext *dtext = ctx->priv;

  540.     char *text = dtext->text;

  541.     uint32_t code = 0, prev_code = 0;

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

  543.     int text_height, baseline;

  544.     uint8_t *p;

  545.     int str_w, str_w_max;

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

  547.     FT_Vector delta;

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

  549.     Glyph dummy = { 0 };

  550. 

  551. #if HAVE_LOCALTIME_R

  552.     time_t now = time(0);

  553.     struct tm ltime;

  554.     size_t expanded_text_len;

  555. 

  556.     dtext->expanded_text[0] = '\1';

  557.     expanded_text_len = strftime(dtext->expanded_text, MAX_EXPANDED_TEXT_SIZE,

  558.                                  text, localtime_r(&now, &ltime));

  559.     text = dtext->expanded_text;

  560.     if (expanded_text_len == 0 && dtext->expanded_text[0] != '\0') {

  561.         av_log(ctx, AV_LOG_ERROR,

  562.                "Impossible to print text, string is too big\n");

  563.         return AVERROR(EINVAL);

  564.     }

  565. #endif

  566. 

  567.     str_w = str_w_max = 0;

  568.     x = dtext->x;

  569.     y = dtext->y;

  570. 

  571.     /* load and cache glyphs */

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

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

  574. 

  575.         /* get glyph */

  576.         dummy.code = code;

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

  578.         if (!glyph)

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

  580. 

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

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

  583.     }

  584.     text_height = y_max - y_min;

  585.     baseline    = y_max;

  586. 

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

  588.     glyph = NULL;

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

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

  591. 

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

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

  594.             continue;

  595. 

  596.         /* get glyph */

  597.         prev_glyph = glyph;

  598.         dummy.code = code;

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

  600. 

  601.         /* kerning */

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

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

  604.                            ft_kerning_default, &delta);

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

  606.         }

  607. 

  608.         if (x + glyph->advance >= width || code == '\r' || code == '\n') {

  609.             if (x + glyph->advance >= width)

  610.                 str_w_max = width - dtext->x - 1;

  611.             y += text_height;

  612.             x = dtext->x;

  613.         }

  614. 

  615.         /* save position */

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

  617.         dtext->positions[i].y = y - glyph->bitmap_top + baseline;

  618.         if (code != '\n' && code != '\r') {

  619.             int advance = glyph->advance;

  620.             if (code == '\t')

  621.                 advance *= dtext->tabsize;

  622.             x     += advance;

  623.             str_w += advance;

  624.         }

  625.         prev_code = code;

  626.     }

  627. 

  628.     y += text_height;

  629.     if (str_w_max == 0)

  630.         str_w_max = str_w;

  631. 

  632.     /* draw box */

  633.     if (dtext->draw_box) {

  634.         /* check if it doesn't pass the limits */

  635.         str_w_max = FFMIN(str_w_max, width - dtext->x - 1);

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

  637. 

  638.         /* draw background */

  639.         drawbox(picref, dtext->x, dtext->y, str_w_max, y-dtext->y,

  640.                 dtext->box_line, dtext->pixel_step, dtext->boxcolor,

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

  642.     }

  643. 

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

  645.         if((ret=draw_glyphs(dtext, picref, width, height, dtext->shadowcolor_rgba, dtext->shadowcolor, dtext->shadowx, dtext->shadowy))<0)

  646.             return ret;

  647.     }

  648. 

  649.     if((ret=draw_glyphs(dtext, picref, width, height, dtext->fontcolor_rgba, dtext->fontcolor, 0, 0))<0)

  650.         return ret;

  651. 

  652.     return 0;

  653. }

  654. 

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

  656. 

  657. static void end_frame(AVFilterLink *inlink)

  658. {

  659.     AVFilterLink *outlink = inlink->dst->outputs[0];

  660.     AVFilterBufferRef *picref = inlink->cur_buf;

  661. 

  662.     draw_text(inlink->dst, picref, picref->video->w, picref->video->h);

  663. 

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

  665.     avfilter_end_frame(outlink);

  666. }

  667. 

  668. AVFilter avfilter_vf_drawtext = {

  669.     .name          = "drawtext",

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

  671.     .priv_size     = sizeof(DrawTextContext),

  672.     .init          = init,

  673.     .uninit        = uninit,

  674.     .query_formats = query_formats,

  675. 

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

  677.                                     .type             = AVMEDIA_TYPE_VIDEO,

  678.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  679.                                     .start_frame      = avfilter_null_start_frame,

  680.                                     .draw_slice       = null_draw_slice,

  681.                                     .end_frame        = end_frame,

  682.                                     .config_props     = config_input,

  683.                                     .min_perms        = AV_PERM_WRITE |

  684.                                                         AV_PERM_READ,

  685.                                     .rej_perms        = AV_PERM_PRESERVE },

  686.                                   { .name = NULL}},

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

  688.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  689.                                   { .name = NULL}},

  690. };