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

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

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

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

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

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

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

  65. 

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

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

  68.     int tabsize;                    ///< tab size

  69. 

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

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

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

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

  74.     int is_packed_rgb;

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

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

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

  78. } DrawTextContext;

  79. 

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

  81. 

  82. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

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

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

  93. 

  94. /* FT_LOAD_* flags */

  95. {"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" },

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

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

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

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

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

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

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

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

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

  105. {"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" },

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

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

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

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

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

  111. {NULL},

  112. };

  113. 

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

  115. {

  116.     return "drawtext";

  117. }

  118. 

  119. static const AVClass drawtext_class = {

  120.     "DrawTextContext",

  121.     drawtext_get_name,

  122.     drawtext_options

  123. };

  124. 

  125. #undef __FTERRORS_H__

  126. #define FT_ERROR_START_LIST {

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

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

  129. 

  130. struct ft_error

  131. {

  132.     int err;

  133.     const char *err_msg;

  134. } static ft_errors[] =

  135. #include FT_ERRORS_H

  136. 

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

  138. 

  139. typedef struct {

  140.     FT_Glyph *glyph;

  141.     uint32_t code;

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

  143.     FT_BBox bbox;

  144.     int advance;

  145.     int bitmap_left;

  146.     int bitmap_top;

  147. } Glyph;

  148. 

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

  150. {

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

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

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

  154. }

  155. 

  156. /**

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

  158.  */

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

  160. {

  161.     DrawTextContext *dtext = ctx->priv;

  162.     Glyph *glyph;

  163.     struct AVTreeNode *node = NULL;

  164.     int ret;

  165. 

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

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

  168.         return AVERROR(EINVAL);

  169. 

  170.     /* save glyph */

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

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

  173.         ret = AVERROR(ENOMEM);

  174.         goto error;

  175.     }

  176.     glyph->code  = code;

  177. 

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

  179.         ret = AVERROR(EINVAL);

  180.         goto error;

  181.     }

  182. 

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

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

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

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

  187. 

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

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

  190. 

  191.     /* cache the newly created glyph */

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

  193.         ret = AVERROR(ENOMEM);

  194.         goto error;

  195.     }

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

  197. 

  198.     if (glyph_ptr)

  199.         *glyph_ptr = glyph;

  200.     return 0;

  201. 

  202. error:

  203.     if (glyph)

  204.         av_freep(&glyph->glyph);

  205.     av_freep(&glyph);

  206.     av_freep(&node);

  207.     return ret;

  208. }

  209. 

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

  211. {

  212.     int err;

  213.     DrawTextContext *dtext = ctx->priv;

  214.     Glyph *glyph;

  215. 

  216.     dtext->class = &drawtext_class;

  217.     av_opt_set_defaults2(dtext, 0, 0);

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

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

  220. 

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

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

  223.         return err;

  224.     }

  225. 

  226.     if (!dtext->fontfile) {

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

  228.         return AVERROR(EINVAL);

  229.     }

  230. 

  231.     if (dtext->textfile) {

  232.         uint8_t *textbuf;

  233.         size_t textbuf_size;

  234. 

  235.         if (dtext->text) {

  236.             av_log(ctx, AV_LOG_ERROR,

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

  238.             return AVERROR(EINVAL);

  239.         }

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

  241.             av_log(ctx, AV_LOG_ERROR,

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

  243.                    dtext->textfile);

  244.             return err;

  245.         }

  246. 

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

  248.             return AVERROR(ENOMEM);

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

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

  251.         av_file_unmap(textbuf, textbuf_size);

  252.     }

  253. 

  254.     if (!dtext->text) {

  255.         av_log(ctx, AV_LOG_ERROR,

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

  257.         return AVERROR(EINVAL);

  258.     }

  259. 

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

  261.         av_log(ctx, AV_LOG_ERROR,

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

  263.         return err;

  264.     }

  265. 

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

  267.         av_log(ctx, AV_LOG_ERROR,

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

  269.         return err;

  270.     }

  271. 

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

  273.         av_log(ctx, AV_LOG_ERROR,

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

  275.         return AVERROR(EINVAL);

  276.     }

  277. 

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

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

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

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

  282.         return AVERROR(EINVAL);

  283.     }

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

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

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

  287.         return AVERROR(EINVAL);

  288.     }

  289. 

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

  291. 

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

  293.     load_glyph(ctx, NULL, 0);

  294. 

  295.     /* set the tabsize in pixels */

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

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

  298.         return err;

  299.     }

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

  301. 

  302. #if !HAVE_LOCALTIME_R

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

  304. #endif

  305. 

  306.     return 0;

  307. }

  308. 

  309. static int query_formats(AVFilterContext *ctx)

  310. {

  311.     static const enum PixelFormat pix_fmts[] = {

  312.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  313.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  314.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  315.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  316.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  317.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  318.         PIX_FMT_NONE

  319.     };

  320. 

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

  322.     return 0;

  323. }

  324. 

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

  326. {

  327.     av_free(elem);

  328.     return 0;

  329. }

  330. 

  331. static av_cold void uninit(AVFilterContext *ctx)

  332. {

  333.     DrawTextContext *dtext = ctx->priv;

  334.     int i;

  335. 

  336.     av_freep(&dtext->fontfile);

  337.     av_freep(&dtext->text);

  338.     av_freep(&dtext->fontcolor_string);

  339.     av_freep(&dtext->boxcolor_string);

  340.     av_freep(&dtext->positions);

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

  342.     av_tree_destroy(dtext->glyphs);

  343.     dtext->glyphs = 0;

  344.     FT_Done_Face(dtext->face);

  345.     FT_Done_FreeType(dtext->library);

  346. 

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

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

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

  350.     }

  351. 

  352. }

  353. 

  354. static int config_input(AVFilterLink *inlink)

  355. {

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

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

  358.     int ret;

  359. 

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

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

  362. 

  363.     if ((ret =

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

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

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

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

  368.         return ret;

  369. 

  370.     if (!dtext->is_packed_rgb) {

  371.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  376.     }

  377. 

  378.     return 0;

  379. }

  380. 

  381. #define GET_BITMAP_VAL(r, c)                                            \

  382.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  385. 

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

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

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

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

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

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

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

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

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

  395.     }\

  396. }

  397. 

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

  399.                                  unsigned int y, unsigned int width, unsigned int height,

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

  401. {

  402.     int r, c, alpha;

  403.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  404.     uint8_t src_val, dst_pixel[4];

  405. 

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

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

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

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

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

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

  412. 

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

  414.             src_val = GET_BITMAP_VAL(r, c);

  415.             if (!src_val)

  416.                 continue;

  417. 

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

  419.         }

  420.     }

  421. 

  422.     return 0;

  423. }

  424. 

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

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

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

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

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

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

  431. }

  432. 

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

  434.                                  unsigned int x, unsigned int y,

  435.                                  unsigned int width, unsigned int height, int pixel_step,

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

  437. {

  438.     int r, c, alpha;

  439.     uint8_t *p;

  440.     uint8_t src_val, dst_pixel[4];

  441. 

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

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

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

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

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

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

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

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

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

  451. 

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

  453.             src_val = GET_BITMAP_VAL(r, c);

  454.             if (!src_val)

  455.                 continue;

  456. 

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

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

  459.         }

  460.     }

  461. 

  462.     return 0;

  463. }

  464. 

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

  466.                            unsigned int width, unsigned int height,

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

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

  469. {

  470.     int i, j, alpha;

  471. 

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

  473.         if (is_rgba_packed) {

  474.             uint8_t *p;

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

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

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

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

  479.         } else {

  480.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  484.         }

  485.     } else {

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

  487.                           line, pixel_step, hsub, vsub,

  488.                           x, y, width, height);

  489.     }

  490. }

  491. 

  492. static inline int is_newline(uint32_t c)

  493. {

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

  495. }

  496. 

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

  498.                      int width, int height)

  499. {

  500.     DrawTextContext *dtext = ctx->priv;

  501.     uint32_t code = 0, prev_code = 0;

  502.     int x = 0, y = 0, i = 0;

  503.     int text_height, baseline;

  504.     uint8_t *p;

  505.     int str_w = 0;

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

  507.     FT_Vector delta;

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

  509.     Glyph dummy = { 0 };

  510. 

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

  512. #if HAVE_LOCALTIME_R

  513.         time_t now = time(0);

  514.         struct tm ltime;

  515.         uint8_t *buf = NULL;

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

  517. 

  518.         localtime_r(&now, &ltime);

  519. 

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

  521.             *buf = 1;

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

  523.                 break;

  524.             buflen *= 2;

  525.         }

  526.         if (!buf)

  527.             return AVERROR(ENOMEM);

  528.         av_freep(&dtext->text);

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

  530. #else

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

  532. #endif

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

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

  535.             return AVERROR(ENOMEM);

  536.     }

  537. 

  538.     x = dtext->x;

  539.     y = dtext->y;

  540. 

  541.     /* load and cache glyphs */

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

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

  544. 

  545.         /* get glyph */

  546.         dummy.code = code;

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

  548.         if (!glyph)

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

  550. 

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

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

  553.     }

  554.     text_height = y_max - y_min;

  555.     baseline    = y_max;

  556. 

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

  558.     glyph = NULL;

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

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

  561. 

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

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

  564.             continue;

  565. 

  566.         prev_code = code;

  567.         if (is_newline(code)) {

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

  569.             y += text_height;

  570.             x = dtext->x;

  571.             continue;

  572.         }

  573. 

  574.         /* get glyph */

  575.         prev_glyph = glyph;

  576.         dummy.code = code;

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

  578. 

  579.         /* kerning */

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

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

  582.                            ft_kerning_default, &delta);

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

  584.         }

  585. 

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

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

  588.             y += text_height;

  589.             x = dtext->x;

  590.         }

  591. 

  592.         /* save position */

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

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

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

  596.         else              x += glyph->advance;

  597.     }

  598. 

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

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

  601. 

  602.     /* draw box */

  603.     if (dtext->draw_box)

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

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

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

  607. 

  608.     /* draw glyphs */

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

  610.         Glyph dummy = { 0 };

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

  612. 

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

  614.         if (is_newline(code) || code == ' ' || code == '\t')

  615.             continue;

  616. 

  617.         dummy.code = code;

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

  619. 

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

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

  622.             return AVERROR(EINVAL);

  623. 

  624.         if (dtext->is_packed_rgb) {

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

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

  627.                            dtext->pixel_step[0], dtext->fontcolor_rgba, dtext->rgba_map);

  628.         } else {

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

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

  631.                            dtext->fontcolor, dtext->hsub, dtext->vsub);

  632.         }

  633.     }

  634. 

  635.     return 0;

  636. }

  637. 

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

  639. 

  640. static void end_frame(AVFilterLink *inlink)

  641. {

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

  643.     AVFilterBufferRef *picref = inlink->cur_buf;

  644. 

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

  646. 

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

  648.     avfilter_end_frame(outlink);

  649. }

  650. 

  651. AVFilter avfilter_vf_drawtext = {

  652.     .name          = "drawtext",

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

  654.     .priv_size     = sizeof(DrawTextContext),

  655.     .init          = init,

  656.     .uninit        = uninit,

  657.     .query_formats = query_formats,

  658. 

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

  660.                                     .type             = AVMEDIA_TYPE_VIDEO,

  661.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  662.                                     .start_frame      = avfilter_null_start_frame,

  663.                                     .draw_slice       = null_draw_slice,

  664.                                     .end_frame        = end_frame,

  665.                                     .config_props     = config_input,

  666.                                     .min_perms        = AV_PERM_WRITE |

  667.                                                         AV_PERM_READ,

  668.                                     .rej_perms        = AV_PERM_PRESERVE },

  669.                                   { .name = NULL}},

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

  671.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  672.                                   { .name = NULL}},

  673. };