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

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

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

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

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

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

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

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

  60.     int shadowx, shadowy;

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

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

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

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

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

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

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

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

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

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

  71. 

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

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

  74.     int tabsize;                    ///< tab size

  75. 

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

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

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

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

  80.     int is_packed_rgb;

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

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

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

  84. } DrawTextContext;

  85. 

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

  87. 

  88. static const AVOption drawtext_options[]= {

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

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

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

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

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

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

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

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

  97. {"x",        "set x",                OFFSET(x),                  FF_OPT_TYPE_INT,    {.dbl=0},     0,        INT_MAX  },

  98. {"y",        "set y",                OFFSET(y),                  FF_OPT_TYPE_INT,    {.dbl=0},     0,        INT_MAX  },

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

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

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

  102. 

  103. /* FT_LOAD_* flags */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  120. {NULL},

  121. };

  122. 

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

  124. {

  125.     return "drawtext";

  126. }

  127. 

  128. static const AVClass drawtext_class = {

  129.     "DrawTextContext",

  130.     drawtext_get_name,

  131.     drawtext_options

  132. };

  133. 

  134. #undef __FTERRORS_H__

  135. #define FT_ERROR_START_LIST {

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

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

  138. 

  139. struct ft_error

  140. {

  141.     int err;

  142.     const char *err_msg;

  143. } static ft_errors[] =

  144. #include FT_ERRORS_H

  145. 

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

  147. 

  148. typedef struct {

  149.     FT_Glyph *glyph;

  150.     uint32_t code;

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

  152.     FT_BBox bbox;

  153.     int advance;

  154.     int bitmap_left;

  155.     int bitmap_top;

  156. } Glyph;

  157. 

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

  159. {

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

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

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

  163. }

  164. 

  165. /**

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

  167.  */

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

  169. {

  170.     DrawTextContext *dtext = ctx->priv;

  171.     Glyph *glyph;

  172.     struct AVTreeNode *node = NULL;

  173.     int ret;

  174. 

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

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

  177.         return AVERROR(EINVAL);

  178. 

  179.     /* save glyph */

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

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

  182.         ret = AVERROR(ENOMEM);

  183.         goto error;

  184.     }

  185.     glyph->code  = code;

  186. 

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

  188.         ret = AVERROR(EINVAL);

  189.         goto error;

  190.     }

  191. 

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

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

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

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

  196. 

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

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

  199. 

  200.     /* cache the newly created glyph */

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

  202.         ret = AVERROR(ENOMEM);

  203.         goto error;

  204.     }

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

  206. 

  207.     if (glyph_ptr)

  208.         *glyph_ptr = glyph;

  209.     return 0;

  210. 

  211. error:

  212.     if (glyph)

  213.         av_freep(&glyph->glyph);

  214.     av_freep(&glyph);

  215.     av_freep(&node);

  216.     return ret;

  217. }

  218. 

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

  220. {

  221.     int err;

  222.     DrawTextContext *dtext = ctx->priv;

  223.     Glyph *glyph;

  224. 

  225.     dtext->class = &drawtext_class;

  226.     av_opt_set_defaults2(dtext, 0, 0);

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

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

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

  230. 

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

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

  233.         return err;

  234.     }

  235. 

  236.     if (!dtext->fontfile) {

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

  238.         return AVERROR(EINVAL);

  239.     }

  240. 

  241.     if (dtext->textfile) {

  242.         uint8_t *textbuf;

  243.         size_t textbuf_size;

  244. 

  245.         if (dtext->text) {

  246.             av_log(ctx, AV_LOG_ERROR,

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

  248.             return AVERROR(EINVAL);

  249.         }

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

  251.             av_log(ctx, AV_LOG_ERROR,

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

  253.                    dtext->textfile);

  254.             return err;

  255.         }

  256. 

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

  258.             return AVERROR(ENOMEM);

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

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

  261.         av_file_unmap(textbuf, textbuf_size);

  262.     }

  263. 

  264.     if (!dtext->text) {

  265.         av_log(ctx, AV_LOG_ERROR,

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

  267.         return AVERROR(EINVAL);

  268.     }

  269. 

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

  271.         av_log(ctx, AV_LOG_ERROR,

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

  273.         return err;

  274.     }

  275. 

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

  277.         av_log(ctx, AV_LOG_ERROR,

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

  279.         return err;

  280.     }

  281. 

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

  283.         av_log(ctx, AV_LOG_ERROR,

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

  285.         return err;

  286.     }

  287. 

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

  289.         av_log(ctx, AV_LOG_ERROR,

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

  291.         return AVERROR(EINVAL);

  292.     }

  293. 

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

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

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

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

  298.         return AVERROR(EINVAL);

  299.     }

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

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

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

  303.         return AVERROR(EINVAL);

  304.     }

  305. 

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

  307. 

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

  309.     load_glyph(ctx, NULL, 0);

  310. 

  311.     /* set the tabsize in pixels */

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

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

  314.         return err;

  315.     }

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

  317. 

  318. #if !HAVE_LOCALTIME_R

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

  320. #endif

  321. 

  322.     return 0;

  323. }

  324. 

  325. static int query_formats(AVFilterContext *ctx)

  326. {

  327.     static const enum PixelFormat pix_fmts[] = {

  328.         PIX_FMT_ARGB,    PIX_FMT_RGBA,

  329.         PIX_FMT_ABGR,    PIX_FMT_BGRA,

  330.         PIX_FMT_RGB24,   PIX_FMT_BGR24,

  331.         PIX_FMT_YUV420P, PIX_FMT_YUV444P,

  332.         PIX_FMT_YUV422P, PIX_FMT_YUV411P,

  333.         PIX_FMT_YUV410P, PIX_FMT_YUV440P,

  334.         PIX_FMT_NONE

  335.     };

  336. 

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

  338.     return 0;

  339. }

  340. 

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

  342. {

  343.     av_free(elem);

  344.     return 0;

  345. }

  346. 

  347. static av_cold void uninit(AVFilterContext *ctx)

  348. {

  349.     DrawTextContext *dtext = ctx->priv;

  350.     int i;

  351. 

  352.     av_freep(&dtext->fontfile);

  353.     av_freep(&dtext->text);

  354.     av_freep(&dtext->expanded_text);

  355.     av_freep(&dtext->fontcolor_string);

  356.     av_freep(&dtext->boxcolor_string);

  357.     av_freep(&dtext->positions);

  358.     av_freep(&dtext->shadowcolor_string);

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

  360.     av_tree_destroy(dtext->glyphs);

  361.     dtext->glyphs = 0;

  362.     FT_Done_Face(dtext->face);

  363.     FT_Done_FreeType(dtext->library);

  364. 

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

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

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

  368.     }

  369. 

  370. }

  371. 

  372. static int config_input(AVFilterLink *inlink)

  373. {

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

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

  376.     int ret;

  377. 

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

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

  380. 

  381.     if ((ret =

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

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

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

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

  386.         return ret;

  387. 

  388.     if (!dtext->is_packed_rgb) {

  389.         uint8_t *rgba = dtext->fontcolor_rgba;

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

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

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

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

  394.         rgba = dtext->shadowcolor_rgba;

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

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

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

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

  399.     }

  400. 

  401.     return 0;

  402. }

  403. 

  404. #define GET_BITMAP_VAL(r, c)                                            \

  405.     bitmap->pixel_mode == FT_PIXEL_MODE_MONO ?                          \

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

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

  408. 

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

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

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

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

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

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

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

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

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

  418.     }\

  419. }

  420. 

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

  422.                                  unsigned int y, unsigned int width, unsigned int height,

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

  424. {

  425.     int r, c, alpha;

  426.     unsigned int luma_pos, chroma_pos1, chroma_pos2;

  427.     uint8_t src_val;

  428. 

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

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

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

  432.             src_val = GET_BITMAP_VAL(r, c);

  433.             if (!src_val)

  434.                 continue;

  435. 

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

  437.         }

  438.     }

  439. 

  440.     return 0;

  441. }

  442. 

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

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

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

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

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

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

  449. }

  450. 

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

  452.                                  unsigned int x, unsigned int y,

  453.                                  unsigned int width, unsigned int height, int pixel_step,

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

  455. {

  456.     int r, c, alpha;

  457.     uint8_t *p;

  458.     uint8_t src_val;

  459. 

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

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

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

  463.             src_val = GET_BITMAP_VAL(r, c);

  464.             if (!src_val)

  465.                 continue;

  466. 

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

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

  469.         }

  470.     }

  471. 

  472.     return 0;

  473. }

  474. 

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

  476.                            unsigned int width, unsigned int height,

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

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

  479. {

  480.     int i, j, alpha;

  481. 

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

  483.         if (is_rgba_packed) {

  484.             uint8_t *p;

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

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

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

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

  489.         } else {

  490.             unsigned int luma_pos, chroma_pos1, chroma_pos2;

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

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

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

  494.         }

  495.     } else {

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

  497.                           line, pixel_step, hsub, vsub,

  498.                           x, y, width, height);

  499.     }

  500. }

  501. 

  502. static inline int is_newline(uint32_t c)

  503. {

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

  505. }

  506. 

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

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

  509. {

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

  511.     uint32_t code = 0;

  512.     int i;

  513.     uint8_t *p;

  514.     Glyph *glyph = NULL;

  515. 

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

  517.         Glyph dummy = { 0 };

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

  519. 

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

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

  522.             continue;

  523. 

  524.         dummy.code = code;

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

  526. 

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

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

  529.             return AVERROR(EINVAL);

  530. 

  531.         if (dtext->is_packed_rgb) {

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

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

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

  535.         } else {

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

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

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

  539.         }

  540.     }

  541. 

  542.     return 0;

  543. }

  544. 

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

  546.                      int width, int height)

  547. {

  548.     DrawTextContext *dtext = ctx->priv;

  549.     uint32_t code = 0, prev_code = 0;

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

  551.     int text_height, baseline;

  552.     char *text = dtext->text;

  553.     uint8_t *p;

  554.     int str_w = 0, len;

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

  556.     FT_Vector delta;

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

  558.     Glyph dummy = { 0 };

  559. 

  560. #if HAVE_LOCALTIME_R

  561.     time_t now = time(0);

  562.     struct tm ltime;

  563.     uint8_t *buf = dtext->expanded_text;

  564.     int buf_size = dtext->expanded_text_size;

  565. 

  566.     if (!buf) {

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

  568.         buf = av_malloc(buf_size);

  569.     }

  570. 

  571.     localtime_r(&now, &ltime);

  572. 

  573.     do {

  574.         *buf = 1;

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

  576.             break;

  577.         buf_size *= 2;

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

  579. 

  580.     if (!buf)

  581.         return AVERROR(ENOMEM);

  582.     text = dtext->expanded_text = buf;

  583.     dtext->expanded_text_size = buf_size;

  584. #endif

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

  586.         if (!(dtext->positions =

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

  588.             return AVERROR(ENOMEM);

  589.         dtext->nb_positions = len;

  590.     }

  591. 

  592.     x = dtext->x;

  593.     y = dtext->y;

  594. 

  595.     /* load and cache glyphs */

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

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

  598. 

  599.         /* get glyph */

  600.         dummy.code = code;

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

  602.         if (!glyph)

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

  604. 

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

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

  607.     }

  608.     text_height = y_max - y_min;

  609.     baseline    = y_max;

  610. 

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

  612.     glyph = NULL;

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

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

  615. 

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

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

  618.             continue;

  619. 

  620.         prev_code = code;

  621.         if (is_newline(code)) {

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

  623.             y += text_height;

  624.             x = dtext->x;

  625.             continue;

  626.         }

  627. 

  628.         /* get glyph */

  629.         prev_glyph = glyph;

  630.         dummy.code = code;

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

  632. 

  633.         /* kerning */

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

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

  636.                            ft_kerning_default, &delta);

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

  638.         }

  639. 

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

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

  642.             y += text_height;

  643.             x = dtext->x;

  644.         }

  645. 

  646.         /* save position */

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

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

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

  650.         else              x += glyph->advance;

  651.     }

  652. 

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

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

  655. 

  656.     /* draw box */

  657.     if (dtext->draw_box)

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

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

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

  661. 

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

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

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

  665.             return ret;

  666.     }

  667. 

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

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

  670.         return ret;

  671. 

  672.     return 0;

  673. }

  674. 

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

  676. 

  677. static void end_frame(AVFilterLink *inlink)

  678. {

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

  680.     AVFilterBufferRef *picref = inlink->cur_buf;

  681. 

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

  683. 

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

  685.     avfilter_end_frame(outlink);

  686. }

  687. 

  688. AVFilter avfilter_vf_drawtext = {

  689.     .name          = "drawtext",

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

  691.     .priv_size     = sizeof(DrawTextContext),

  692.     .init          = init,

  693.     .uninit        = uninit,

  694.     .query_formats = query_formats,

  695. 

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

  697.                                     .type             = AVMEDIA_TYPE_VIDEO,

  698.                                     .get_video_buffer = avfilter_null_get_video_buffer,

  699.                                     .start_frame      = avfilter_null_start_frame,

  700.                                     .draw_slice       = null_draw_slice,

  701.                                     .end_frame        = end_frame,

  702.                                     .config_props     = config_input,

  703.                                     .min_perms        = AV_PERM_WRITE |

  704.                                                         AV_PERM_READ,

  705.                                     .rej_perms        = AV_PERM_PRESERVE },

  706.                                   { .name = NULL}},

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

  708.                                     .type             = AVMEDIA_TYPE_VIDEO, },

  709.                                   { .name = NULL}},

  710. };