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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. typedef struct {

  49.     const AVClass *class;

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

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

  52.     uint8_t *text_priv;             ///< used to detect whether text changed

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

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

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

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

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

  58.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  69. 

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

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

  72.     int tabsize;                    ///< tab size

  73. 

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

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

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

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

  78.     int is_packed_rgb;

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

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

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

  82. } DrawTextContext;

  83. 

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

  85. 

  86. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

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

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

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

  100. 

  101. /* FT_LOAD_* flags */

  102. {"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" },

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

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

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

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

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

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

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

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

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

  112. {"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" },

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

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

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

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

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

  118. {NULL},

  119. };

  120. 

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

  122. {

  123.     return "drawtext";

  124. }

  125. 

  126. static const AVClass drawtext_class = {

  127.     "DrawTextContext",

  128.     drawtext_get_name,

  129.     drawtext_options

  130. };

  131. 

  132. #undef __FTERRORS_H__

  133. #define FT_ERROR_START_LIST {

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

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

  136. 

  137. struct ft_error

  138. {

  139.     int err;

  140.     const char *err_msg;

  141. } static ft_errors[] =

  142. #include FT_ERRORS_H

  143. 

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

  145. 

  146. typedef struct {

  147.     FT_Glyph *glyph;

  148.     uint32_t code;

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

  150.     FT_BBox bbox;

  151.     int advance;

  152.     int bitmap_left;

  153.     int bitmap_top;

  154. } Glyph;

  155. 

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

  157. {

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

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

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

  161. }

  162. 

  163. /**

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

  165.  */

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

  167. {

  168.     DrawTextContext *dtext = ctx->priv;

  169.     Glyph *glyph;

  170.     struct AVTreeNode *node = NULL;

  171.     int ret;

  172. 

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

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

  175.         return AVERROR(EINVAL);

  176. 

  177.     /* save glyph */

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

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

  180.         ret = AVERROR(ENOMEM);

  181.         goto error;

  182.     }

  183.     glyph->code  = code;

  184. 

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

  186.         ret = AVERROR(EINVAL);

  187.         goto error;

  188.     }

  189. 

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

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

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

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

  194. 

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

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

  197. 

  198.     /* cache the newly created glyph */

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

  200.         ret = AVERROR(ENOMEM);

  201.         goto error;

  202.     }

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

  204. 

  205.     if (glyph_ptr)

  206.         *glyph_ptr = glyph;

  207.     return 0;

  208. 

  209. error:

  210.     if (glyph)

  211.         av_freep(&glyph->glyph);

  212.     av_freep(&glyph);

  213.     av_freep(&node);

  214.     return ret;

  215. }

  216. 

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

  218. {

  219.     int err;

  220.     DrawTextContext *dtext = ctx->priv;

  221.     Glyph *glyph;

  222. 

  223.     dtext->class = &drawtext_class;

  224.     av_opt_set_defaults2(dtext, 0, 0);

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

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

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

  228. 

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

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

  231.         return err;

  232.     }

  233. 

  234.     if (!dtext->fontfile) {

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

  236.         return AVERROR(EINVAL);

  237.     }

  238. 

  239.     if (dtext->textfile) {

  240.         uint8_t *textbuf;

  241.         size_t textbuf_size;

  242. 

  243.         if (dtext->text) {

  244.             av_log(ctx, AV_LOG_ERROR,

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

  246.             return AVERROR(EINVAL);

  247.         }

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

  249.             av_log(ctx, AV_LOG_ERROR,

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

  251.                    dtext->textfile);

  252.             return err;

  253.         }

  254. 

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

  256.             return AVERROR(ENOMEM);

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

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

  259.         av_file_unmap(textbuf, textbuf_size);

  260.     }

  261. 

  262.     if (!dtext->text) {

  263.         av_log(ctx, AV_LOG_ERROR,

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

  265.         return AVERROR(EINVAL);

  266.     }

  267. 

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

  269.         av_log(ctx, AV_LOG_ERROR,

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

  271.         return err;

  272.     }

  273. 

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

  275.         av_log(ctx, AV_LOG_ERROR,

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

  277.         return err;

  278.     }

  279. 

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

  281.         av_log(ctx, AV_LOG_ERROR,

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

  283.         return err;

  284.     }

  285. 

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

  287.         av_log(ctx, AV_LOG_ERROR,

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

  289.         return AVERROR(EINVAL);

  290.     }

  291. 

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

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

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

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

  296.         return AVERROR(EINVAL);

  297.     }

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

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

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

  301.         return AVERROR(EINVAL);

  302.     }

  303. 

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

  305. 

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

  307.     load_glyph(ctx, NULL, 0);

  308. 

  309.     /* set the tabsize in pixels */

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

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

  312.         return err;

  313.     }

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

  315. 

  316. #if !HAVE_LOCALTIME_R

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

  318. #endif

  319. 

  320.     return 0;

  321. }

  322. 

  323. static int query_formats(AVFilterContext *ctx)

  324. {

  325.     static const enum PixelFormat pix_fmts[] = {

  326.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  327.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  328.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  329.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  330.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  331.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  332.         PIX_FMT_NONE

  333.     };

  334. 

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

  336.     return 0;

  337. }

  338. 

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

  340. {

  341.     av_free(elem);

  342.     return 0;

  343. }

  344. 

  345. static av_cold void uninit(AVFilterContext *ctx)

  346. {

  347.     DrawTextContext *dtext = ctx->priv;

  348.     int i;

  349. 

  350.     av_freep(&dtext->fontfile);

  351.     av_freep(&dtext->text);

  352.     av_freep(&dtext->fontcolor_string);

  353.     av_freep(&dtext->boxcolor_string);

  354.     av_freep(&dtext->positions);

  355.     av_freep(&dtext->shadowcolor_string);

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

  357.     av_tree_destroy(dtext->glyphs);

  358.     dtext->glyphs = 0;

  359.     FT_Done_Face(dtext->face);

  360.     FT_Done_FreeType(dtext->library);

  361. 

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

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

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

  365.     }

  366. 

  367. }

  368. 

  369. static int config_input(AVFilterLink *inlink)

  370. {

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

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

  373.     int ret;

  374. 

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

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

  377. 

  378.     if ((ret =

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

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

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

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

  383.         return ret;

  384. 

  385.     if (!dtext->is_packed_rgb) {

  386.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  391.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  396.     }

  397. 

  398.     return 0;

  399. }

  400. 

  401. #define GET_BITMAP_VAL(r, c)                                            \

  402.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  405. 

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

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

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

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

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

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

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

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

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

  415.     }\

  416. }

  417. 

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

  419.                                  unsigned int y, unsigned int width, unsigned int height,

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

  421. {

  422.     int r, c, alpha;

  423.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  424.     uint8_t src_val, dst_pixel[4];

  425. 

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

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

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

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

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

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

  432. 

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

  434.             src_val = GET_BITMAP_VAL(r, c);

  435.             if (!src_val)

  436.                 continue;

  437. 

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

  439.         }

  440.     }

  441. 

  442.     return 0;

  443. }

  444. 

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

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

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

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

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

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

  451. }

  452. 

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

  454.                                  unsigned int x, unsigned int y,

  455.                                  unsigned int width, unsigned int height, int pixel_step,

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

  457. {

  458.     int r, c, alpha;

  459.     uint8_t *p;

  460.     uint8_t src_val, dst_pixel[4];

  461. 

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

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

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

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

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

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

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

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

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

  471. 

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

  473.             src_val = GET_BITMAP_VAL(r, c);

  474.             if (!src_val)

  475.                 continue;

  476. 

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

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

  479.         }

  480.     }

  481. 

  482.     return 0;

  483. }

  484. 

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

  486.                            unsigned int width, unsigned int height,

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

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

  489. {

  490.     int i, j, alpha;

  491. 

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

  493.         if (is_rgba_packed) {

  494.             uint8_t *p;

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

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

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

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

  499.         } else {

  500.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  504.         }

  505.     } else {

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

  507.                           line, pixel_step, hsub, vsub,

  508.                           x, y, width, height);

  509.     }

  510. }

  511. 

  512. static inline int is_newline(uint32_t c)

  513. {

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

  515. }

  516. 

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

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

  519. {

  520.     char *text = dtext->text;

  521.     uint32_t code = 0;

  522.     int i;

  523.     uint8_t *p;

  524.     Glyph *glyph = NULL;

  525. 

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

  527.         Glyph dummy = { 0 };

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

  529. 

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

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

  532.             continue;

  533. 

  534.         dummy.code = code;

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

  536. 

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

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

  539.             return AVERROR(EINVAL);

  540. 

  541.         if (dtext->is_packed_rgb) {

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

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

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

  545.         } else {

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

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

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

  549.         }

  550.     }

  551. 

  552.     return 0;

  553. }

  554. 

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

  556.                      int width, int height)

  557. {

  558.     DrawTextContext *dtext = ctx->priv;

  559.     uint32_t code = 0, prev_code = 0;

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

  561.     int text_height, baseline;

  562.     uint8_t *p;

  563.     int str_w = 0;

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

  565.     FT_Vector delta;

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

  567.     Glyph dummy = { 0 };

  568. 

  569.     if (dtext->text != dtext->text_priv) {

  570. #if HAVE_LOCALTIME_R

  571.         time_t now = time(0);

  572.         struct tm ltime;

  573.         uint8_t *buf = NULL;

  574.         int     buflen = 2*strlen(dtext->text) + 1, len;

  575. 

  576.         localtime_r(&now, &ltime);

  577. 

  578.         while ((buf = av_realloc(buf, buflen))) {

  579.             *buf = 1;

  580.             if ((len = strftime(buf, buflen, dtext->text, &ltime)) != 0 || *buf == 0)

  581.                 break;

  582.             buflen *= 2;

  583.         }

  584.         if (!buf)

  585.             return AVERROR(ENOMEM);

  586.         av_freep(&dtext->text);

  587.         dtext->text = dtext->text_priv = buf;

  588. #else

  589.         dtext->text_priv = dtext->text;

  590. #endif

  591.         if (!(dtext->positions = av_realloc(dtext->positions,

  592.                                             strlen(dtext->text)*sizeof(*dtext->positions))))

  593.             return AVERROR(ENOMEM);

  594.     }

  595. 

  596.     x = dtext->x;

  597.     y = dtext->y;

  598. 

  599.     /* load and cache glyphs */

  600.     for (i = 0, p = dtext->text; *p; i++) {

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

  602. 

  603.         /* get glyph */

  604.         dummy.code = code;

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

  606.         if (!glyph)

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

  608. 

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

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

  611.     }

  612.     text_height = y_max - y_min;

  613.     baseline    = y_max;

  614. 

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

  616.     glyph = NULL;

  617.     for (i = 0, p = dtext->text; *p; i++) {

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

  619. 

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

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

  622.             continue;

  623. 

  624.         prev_code = code;

  625.         if (is_newline(code)) {

  626.             str_w = FFMAX(str_w, x - dtext->x);

  627.             y += text_height;

  628.             x = dtext->x;

  629.             continue;

  630.         }

  631. 

  632.         /* get glyph */

  633.         prev_glyph = glyph;

  634.         dummy.code = code;

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

  636. 

  637.         /* kerning */

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

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

  640.                            ft_kerning_default, &delta);

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

  642.         }

  643. 

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

  645.             str_w = FFMAX(str_w, x - dtext->x);

  646.             y += text_height;

  647.             x = dtext->x;

  648.         }

  649. 

  650.         /* save position */

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

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

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

  654.         else              x += glyph->advance;

  655.     }

  656. 

  657.     str_w = FFMIN(width - dtext->x - 1, FFMAX(str_w, x - dtext->x));

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

  659. 

  660.     /* draw box */

  661.     if (dtext->draw_box)

  662.         drawbox(picref, dtext->x, dtext->y, str_w, y-dtext->y,

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

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

  665. 

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

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

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

  669.             return ret;

  670.     }

  671. 

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

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

  674.         return ret;

  675. 

  676.     return 0;

  677. }

  678. 

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

  680. 

  681. static void end_frame(AVFilterLink *inlink)

  682. {

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

  684.     AVFilterBufferRef *picref = inlink->cur_buf;

  685. 

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

  687. 

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

  689.     avfilter_end_frame(outlink);

  690. }

  691. 

  692. AVFilter avfilter_vf_drawtext = {

  693.     .name          = "drawtext",

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

  695.     .priv_size     = sizeof(DrawTextContext),

  696.     .init          = init,

  697.     .uninit        = uninit,

  698.     .query_formats = query_formats,

  699. 

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

  701.                                     .type             = AVMEDIA_TYPE_VIDEO,

  702.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  703.                                     .start_frame      = avfilter_null_start_frame,

  704.                                     .draw_slice       = null_draw_slice,

  705.                                     .end_frame        = end_frame,

  706.                                     .config_props     = config_input,

  707.                                     .min_perms        = AV_PERM_WRITE |

  708.                                                         AV_PERM_READ,

  709.                                     .rej_perms        = AV_PERM_PRESERVE },

  710.                                   { .name = NULL}},

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

  712.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  713.                                   { .name = NULL}},

  714. };