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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 vhook/drawtext.c

  26.  * filter by Gustavo Sverzut Barbieri

  27.  */

  28. 

  29. #include "config.h"

  30. 

  31. #if HAVE_SYS_TIME_H

  32. #include <sys/time.h>

  33. #endif

  34. #include <sys/types.h>

  35. #include <sys/stat.h>

  36. #include <time.h>

  37. #if HAVE_UNISTD_H

  38. #include <unistd.h>

  39. #endif

  40. 

  41. #if CONFIG_LIBFONTCONFIG

  42. #include <fontconfig/fontconfig.h>

  43. #endif

  44. 

  45. #include "libavutil/avstring.h"

  46. #include "libavutil/bprint.h"

  47. #include "libavutil/common.h"

  48. #include "libavutil/file.h"

  49. #include "libavutil/eval.h"

  50. #include "libavutil/opt.h"

  51. #include "libavutil/random_seed.h"

  52. #include "libavutil/parseutils.h"

  53. #include "libavutil/timecode.h"

  54. #include "libavutil/tree.h"

  55. #include "libavutil/lfg.h"

  56. #include "avfilter.h"

  57. #include "drawutils.h"

  58. #include "formats.h"

  59. #include "internal.h"

  60. #include "video.h"

  61. 

  62. #include <ft2build.h>

  63. #include FT_FREETYPE_H

  64. #include FT_GLYPH_H

  65. #include FT_STROKER_H

  66. 

  67. static const char *const var_names[] = {

  68.     "dar",

  69.     "hsub", "vsub",

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

  71.     "main_h", "h", "H",       ///< height of the input video

  72.     "main_w", "w", "W",       ///< width  of the input video

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

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

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

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

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

  78.     "sar",

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

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

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

  82.     "x",

  83.     "y",

  84.     "pict_type",

  85.     NULL

  86. };

  87. 

  88. static const char *const fun2_names[] = {

  89.     "rand"

  90. };

  91. 

  92. static double drand(void *opaque, double min, double max)

  93. {

  94.     return min + (max-min) / UINT_MAX * av_lfg_get(opaque);

  95. }

  96. 

  97. typedef double (*eval_func2)(void *, double a, double b);

  98. 

  99. static const eval_func2 fun2[] = {

  100.     drand,

  101.     NULL

  102. };

  103. 

  104. enum var_name {

  105.     VAR_DAR,

  106.     VAR_HSUB, VAR_VSUB,

  107.     VAR_LINE_H, VAR_LH,

  108.     VAR_MAIN_H, VAR_h, VAR_H,

  109.     VAR_MAIN_W, VAR_w, VAR_W,

  110.     VAR_MAX_GLYPH_A, VAR_ASCENT,

  111.     VAR_MAX_GLYPH_D, VAR_DESCENT,

  112.     VAR_MAX_GLYPH_H,

  113.     VAR_MAX_GLYPH_W,

  114.     VAR_N,

  115.     VAR_SAR,

  116.     VAR_T,

  117.     VAR_TEXT_H, VAR_TH,

  118.     VAR_TEXT_W, VAR_TW,

  119.     VAR_X,

  120.     VAR_Y,

  121.     VAR_PICT_TYPE,

  122.     VAR_VARS_NB

  123. };

  124. 

  125. enum expansion_mode {

  126.     EXP_NONE,

  127.     EXP_NORMAL,

  128.     EXP_STRFTIME,

  129. };

  130. 

  131. typedef struct DrawTextContext {

  132.     const AVClass *class;

  133.     enum expansion_mode exp_mode;   ///< expansion mode to use for the text

  134.     int reinit;                     ///< tells if the filter is being reinited

  135. #if CONFIG_LIBFONTCONFIG

  136.     uint8_t *font;              ///< font to be used

  137. #endif

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

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

  140.     AVBPrint expanded_text;         ///< used to contain the expanded text

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

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

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

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

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

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

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

  148.     int max_glyph_h;                ///< max glyph height

  149.     int shadowx, shadowy;

  150.     int borderw;                    ///< border width

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

  152. 

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

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

  155.     int tabsize;                    ///< tab size

  156.     int fix_bounds;                 ///< do we let it go out of frame bounds - t/f

  157. 

  158.     FFDrawContext dc;

  159.     FFDrawColor fontcolor;          ///< foreground color

  160.     FFDrawColor shadowcolor;        ///< shadow color

  161.     FFDrawColor bordercolor;        ///< border color

  162.     FFDrawColor boxcolor;           ///< background color

  163. 

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

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

  166.     FT_Stroker stroker;             ///< freetype stroker handle

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

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

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

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

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

  172.     double var_values[VAR_VARS_NB];

  173. #if FF_API_DRAWTEXT_OLD_TIMELINE

  174.     char   *draw_expr;              ///< expression for draw

  175.     AVExpr *draw_pexpr;             ///< parsed expression for draw

  176.     int draw;                       ///< set to zero to prevent drawing

  177. #endif

  178.     AVLFG  prng;                    ///< random

  179.     char       *tc_opt_string;      ///< specified timecode option string

  180.     AVRational  tc_rate;            ///< frame rate for timecode

  181.     AVTimecode  tc;                 ///< timecode context

  182.     int tc24hmax;                   ///< 1 if timecode is wrapped to 24 hours, 0 otherwise

  183.     int reload;                     ///< reload text file for each frame

  184.     int start_number;               ///< starting frame number for n/frame_num var

  185.     AVDictionary *metadata;

  186. } DrawTextContext;

  187. 

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

  189. #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

  190. 

  191. static const AVOption drawtext_options[]= {

  192.     {"fontfile",    "set font file",        OFFSET(fontfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},

  193.     {"text",        "set text",             OFFSET(text),               AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},

  194.     {"textfile",    "set text file",        OFFSET(textfile),           AV_OPT_TYPE_STRING, {.str=NULL},  CHAR_MIN, CHAR_MAX, FLAGS},

  195.     {"fontcolor",   "set foreground color", OFFSET(fontcolor.rgba),     AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

  196.     {"boxcolor",    "set box color",        OFFSET(boxcolor.rgba),      AV_OPT_TYPE_COLOR,  {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},

  197.     {"bordercolor", "set border color",     OFFSET(bordercolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

  198.     {"shadowcolor", "set shadow color",     OFFSET(shadowcolor.rgba),   AV_OPT_TYPE_COLOR,  {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},

  199.     {"box",         "set box",              OFFSET(draw_box),           AV_OPT_TYPE_INT,    {.i64=0},     0,        1       , FLAGS},

  200.     {"fontsize",    "set font size",        OFFSET(fontsize),           AV_OPT_TYPE_INT,    {.i64=0},     0,        INT_MAX , FLAGS},

  201.     {"x",           "set x expression",     OFFSET(x_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX, FLAGS},

  202.     {"y",           "set y expression",     OFFSET(y_expr),             AV_OPT_TYPE_STRING, {.str="0"},   CHAR_MIN, CHAR_MAX, FLAGS},

  203.     {"shadowx",     "set x",                OFFSET(shadowx),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},

  204.     {"shadowy",     "set y",                OFFSET(shadowy),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},

  205.     {"borderw",     "set border width",     OFFSET(borderw),            AV_OPT_TYPE_INT,    {.i64=0},     INT_MIN,  INT_MAX , FLAGS},

  206.     {"tabsize",     "set tab size",         OFFSET(tabsize),            AV_OPT_TYPE_INT,    {.i64=4},     0,        INT_MAX , FLAGS},

  207.     {"basetime",    "set base time",        OFFSET(basetime),           AV_OPT_TYPE_INT64,  {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},

  208. #if FF_API_DRAWTEXT_OLD_TIMELINE

  209.     {"draw",        "if false do not draw (deprecated)", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str=NULL},   CHAR_MIN, CHAR_MAX, FLAGS},

  210. #endif

  211. #if CONFIG_LIBFONTCONFIG

  212.     { "font",        "Font name",            OFFSET(font),               AV_OPT_TYPE_STRING, { .str = "Sans" },           .flags = FLAGS },

  213. #endif

  214. 

  215.     {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"},

  216.         {"none",     "set no expansion",                    OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE},     0, 0, FLAGS, "expansion"},

  217.         {"normal",   "set normal expansion",                OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL},   0, 0, FLAGS, "expansion"},

  218.         {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},

  219. 

  220.     {"timecode",        "set initial timecode",             OFFSET(tc_opt_string), AV_OPT_TYPE_STRING,   {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},

  221.     {"tc24hmax",        "set 24 hours max (timecode only)", OFFSET(tc24hmax),      AV_OPT_TYPE_INT,      {.i64=0},           0,        1, FLAGS},

  222.     {"timecode_rate",   "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},

  223.     {"r",               "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},

  224.     {"rate",            "set rate (timecode only)",         OFFSET(tc_rate),       AV_OPT_TYPE_RATIONAL, {.dbl=0},           0,  INT_MAX, FLAGS},

  225.     {"reload",     "reload text file for each frame",                       OFFSET(reload),     AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},

  226.     {"fix_bounds", "if true, check and fix text coords to avoid clipping",  OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},

  227.     {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},

  228. 

  229.     /* FT_LOAD_* flags */

  230.     { "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 0, INT_MAX, FLAGS, "ft_load_flags" },

  231.         { "default",                     NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT },                     .flags = FLAGS, .unit = "ft_load_flags" },

  232.         { "no_scale",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE },                    .flags = FLAGS, .unit = "ft_load_flags" },

  233.         { "no_hinting",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING },                  .flags = FLAGS, .unit = "ft_load_flags" },

  234.         { "render",                      NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER },                      .flags = FLAGS, .unit = "ft_load_flags" },

  235.         { "no_bitmap",                   NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP },                   .flags = FLAGS, .unit = "ft_load_flags" },

  236.         { "vertical_layout",             NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT },             .flags = FLAGS, .unit = "ft_load_flags" },

  237.         { "force_autohint",              NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT },              .flags = FLAGS, .unit = "ft_load_flags" },

  238.         { "crop_bitmap",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP },                 .flags = FLAGS, .unit = "ft_load_flags" },

  239.         { "pedantic",                    NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC },                    .flags = FLAGS, .unit = "ft_load_flags" },

  240.         { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },

  241.         { "no_recurse",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE },                  .flags = FLAGS, .unit = "ft_load_flags" },

  242.         { "ignore_transform",            NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM },            .flags = FLAGS, .unit = "ft_load_flags" },

  243.         { "monochrome",                  NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME },                  .flags = FLAGS, .unit = "ft_load_flags" },

  244.         { "linear_design",               NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN },               .flags = FLAGS, .unit = "ft_load_flags" },

  245.         { "no_autohint",                 NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT },                 .flags = FLAGS, .unit = "ft_load_flags" },

  246.     { NULL }

  247. };

  248. 

  249. AVFILTER_DEFINE_CLASS(drawtext);

  250. 

  251. #undef __FTERRORS_H__

  252. #define FT_ERROR_START_LIST {

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

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

  255. 

  256. struct ft_error

  257. {

  258.     int err;

  259.     const char *err_msg;

  260. } static ft_errors[] =

  261. #include FT_ERRORS_H

  262. 

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

  264. 

  265. typedef struct Glyph {

  266.     FT_Glyph glyph;

  267.     FT_Glyph border_glyph;

  268.     uint32_t code;

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

  270.     FT_Bitmap border_bitmap; ///< array holding bitmaps of font border

  271.     FT_BBox bbox;

  272.     int advance;

  273.     int bitmap_left;

  274.     int bitmap_top;

  275. } Glyph;

  276. 

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

  278. {

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

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

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

  282. }

  283. 

  284. /**

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

  286.  */

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

  288. {

  289.     DrawTextContext *s = ctx->priv;

  290.     FT_BitmapGlyph bitmapglyph;

  291.     Glyph *glyph;

  292.     struct AVTreeNode *node = NULL;

  293.     int ret;

  294. 

  295.     /* load glyph into s->face->glyph */

  296.     if (FT_Load_Char(s->face, code, s->ft_load_flags))

  297.         return AVERROR(EINVAL);

  298. 

  299.     glyph = av_mallocz(sizeof(*glyph));

  300.     if (!glyph) {

  301.         ret = AVERROR(ENOMEM);

  302.         goto error;

  303.     }

  304.     glyph->code  = code;

  305. 

  306.     if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {

  307.         ret = AVERROR(EINVAL);

  308.         goto error;

  309.     }

  310.     if (s->borderw) {

  311.         glyph->border_glyph = glyph->glyph;

  312.         if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||

  313.             FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {

  314.             ret = AVERROR_EXTERNAL;

  315.             goto error;

  316.         }

  317.         bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;

  318.         glyph->border_bitmap = bitmapglyph->bitmap;

  319.     }

  320.     if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {

  321.         ret = AVERROR_EXTERNAL;

  322.         goto error;

  323.     }

  324.     bitmapglyph = (FT_BitmapGlyph) glyph->glyph;

  325. 

  326.     glyph->bitmap      = bitmapglyph->bitmap;

  327.     glyph->bitmap_left = bitmapglyph->left;

  328.     glyph->bitmap_top  = bitmapglyph->top;

  329.     glyph->advance     = s->face->glyph->advance.x >> 6;

  330. 

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

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

  333. 

  334.     /* cache the newly created glyph */

  335.     if (!(node = av_tree_node_alloc())) {

  336.         ret = AVERROR(ENOMEM);

  337.         goto error;

  338.     }

  339.     av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);

  340. 

  341.     if (glyph_ptr)

  342.         *glyph_ptr = glyph;

  343.     return 0;

  344. 

  345. error:

  346.     if (glyph)

  347.         av_freep(&glyph->glyph);

  348. 

  349.     av_freep(&glyph);

  350.     av_freep(&node);

  351.     return ret;

  352. }

  353. 

  354. static int load_font_file(AVFilterContext *ctx, const char *path, int index)

  355. {

  356.     DrawTextContext *s = ctx->priv;

  357.     int err;

  358. 

  359.     err = FT_New_Face(s->library, path, index, &s->face);

  360.     if (err) {

  361.         av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",

  362.                s->fontfile, FT_ERRMSG(err));

  363.         return AVERROR(EINVAL);

  364.     }

  365.     return 0;

  366. }

  367. 

  368. #if CONFIG_LIBFONTCONFIG

  369. static int load_font_fontconfig(AVFilterContext *ctx)

  370. {

  371.     DrawTextContext *s = ctx->priv;

  372.     FcConfig *fontconfig;

  373.     FcPattern *pat, *best;

  374.     FcResult result = FcResultMatch;

  375.     FcChar8 *filename;

  376.     int index;

  377.     double size;

  378.     int err = AVERROR(ENOENT);

  379. 

  380.     fontconfig = FcInitLoadConfigAndFonts();

  381.     if (!fontconfig) {

  382.         av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");

  383.         return AVERROR_UNKNOWN;

  384.     }

  385.     pat = FcNameParse(s->fontfile ? s->fontfile :

  386.                           (uint8_t *)(intptr_t)"default");

  387.     if (!pat) {

  388.         av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");

  389.         return AVERROR(EINVAL);

  390.     }

  391. 

  392.     FcPatternAddString(pat, FC_FAMILY, s->font);

  393.     if (s->fontsize)

  394.         FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);

  395. 

  396.     FcDefaultSubstitute(pat);

  397. 

  398.     if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {

  399.         av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */

  400.         FcPatternDestroy(pat);

  401.         return AVERROR(ENOMEM);

  402.     }

  403. 

  404.     best = FcFontMatch(fontconfig, pat, &result);

  405.     FcPatternDestroy(pat);

  406. 

  407.     if (!best || result != FcResultMatch) {

  408.         av_log(ctx, AV_LOG_ERROR,

  409.                "Cannot find a valid font for the family %s\n",

  410.                s->font);

  411.         goto fail;

  412.     }

  413. 

  414.     if (

  415.         FcPatternGetInteger(best, FC_INDEX, 0, &index   ) != FcResultMatch ||

  416.         FcPatternGetDouble (best, FC_SIZE,  0, &size    ) != FcResultMatch) {

  417.         av_log(ctx, AV_LOG_ERROR, "impossible to find font information");

  418.         return AVERROR(EINVAL);

  419.     }

  420. 

  421.     if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {

  422.         av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",

  423.                s->font);

  424.         goto fail;

  425.     }

  426. 

  427.     av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);

  428.     if (!s->fontsize)

  429.         s->fontsize = size + 0.5;

  430. 

  431.     err = load_font_file(ctx, filename, index);

  432.     if (err)

  433.         return err;

  434.     FcConfigDestroy(fontconfig);

  435. fail:

  436.     FcPatternDestroy(best);

  437.     return err;

  438. }

  439. #endif

  440. 

  441. static int load_font(AVFilterContext *ctx)

  442. {

  443.     DrawTextContext *s = ctx->priv;

  444.     int err;

  445. 

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

  447.     err = load_font_file(ctx, s->fontfile, 0);

  448.     if (!err)

  449.         return 0;

  450. #if CONFIG_LIBFONTCONFIG

  451.     err = load_font_fontconfig(ctx);

  452.     if (!err)

  453.         return 0;

  454. #endif

  455.     return err;

  456. }

  457. 

  458. static int load_textfile(AVFilterContext *ctx)

  459. {

  460.     DrawTextContext *s = ctx->priv;

  461.     int err;

  462.     uint8_t *textbuf;

  463.     uint8_t *tmp;

  464.     size_t textbuf_size;

  465. 

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

  467.         av_log(ctx, AV_LOG_ERROR,

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

  469.                s->textfile);

  470.         return err;

  471.     }

  472. 

  473.     if (!(tmp = av_realloc(s->text, textbuf_size + 1))) {

  474.         av_file_unmap(textbuf, textbuf_size);

  475.         return AVERROR(ENOMEM);

  476.     }

  477.     s->text = tmp;

  478.     memcpy(s->text, textbuf, textbuf_size);

  479.     s->text[textbuf_size] = 0;

  480.     av_file_unmap(textbuf, textbuf_size);

  481. 

  482.     return 0;

  483. }

  484. 

  485. static av_cold int init(AVFilterContext *ctx)

  486. {

  487.     int err;

  488.     DrawTextContext *s = ctx->priv;

  489.     Glyph *glyph;

  490. 

  491. #if FF_API_DRAWTEXT_OLD_TIMELINE

  492.     if (s->draw_expr)

  493.         av_log(ctx, AV_LOG_WARNING, "'draw' option is deprecated and will be removed soon, "

  494.                "you are encouraged to use the generic timeline support through the 'enable' option\n");

  495. #endif

  496. 

  497.     if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {

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

  499.         return AVERROR(EINVAL);

  500.     }

  501. 

  502.     if (s->textfile) {

  503.         if (s->text) {

  504.             av_log(ctx, AV_LOG_ERROR,

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

  506.             return AVERROR(EINVAL);

  507.         }

  508.         if ((err = load_textfile(ctx)) < 0)

  509.             return err;

  510.     }

  511. 

  512.     if (s->reload && !s->textfile)

  513.         av_log(ctx, AV_LOG_WARNING, "No file to reload\n");

  514. 

  515.     if (s->tc_opt_string) {

  516.         int ret = av_timecode_init_from_string(&s->tc, s->tc_rate,

  517.                                                s->tc_opt_string, ctx);

  518.         if (ret < 0)

  519.             return ret;

  520.         if (s->tc24hmax)

  521.             s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;

  522.         if (!s->text)

  523.             s->text = av_strdup("");

  524.     }

  525. 

  526.     if (!s->text) {

  527.         av_log(ctx, AV_LOG_ERROR,

  528.                "Either text, a valid file or a timecode must be provided\n");

  529.         return AVERROR(EINVAL);

  530.     }

  531. 

  532.     if ((err = FT_Init_FreeType(&(s->library)))) {

  533.         av_log(ctx, AV_LOG_ERROR,

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

  535.         return AVERROR(EINVAL);

  536.     }

  537. 

  538.     err = load_font(ctx);

  539.     if (err)

  540.         return err;

  541.     if (!s->fontsize)

  542.         s->fontsize = 16;

  543.     if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {

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

  545.                s->fontsize, FT_ERRMSG(err));

  546.         return AVERROR(EINVAL);

  547.     }

  548. 

  549.     if (s->borderw) {

  550.         if (FT_Stroker_New(s->library, &s->stroker)) {

  551.             av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n");

  552.             return AVERROR_EXTERNAL;

  553.         }

  554.         FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,

  555.                        FT_STROKER_LINEJOIN_ROUND, 0);

  556.     }

  557. 

  558.     s->use_kerning = FT_HAS_KERNING(s->face);

  559. 

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

  561.     load_glyph(ctx, NULL, 0);

  562. 

  563.     /* set the tabsize in pixels */

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

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

  566.         return err;

  567.     }

  568.     s->tabsize *= glyph->advance;

  569. 

  570.     if (s->exp_mode == EXP_STRFTIME &&

  571.         (strchr(s->text, '%') || strchr(s->text, '\\')))

  572.         av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");

  573. 

  574.     av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);

  575. 

  576.     return 0;

  577. }

  578. 

  579. static int query_formats(AVFilterContext *ctx)

  580. {

  581.     ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));

  582.     return 0;

  583. }

  584. 

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

  586. {

  587.     Glyph *glyph = elem;

  588. 

  589.     FT_Done_Glyph(glyph->glyph);

  590.     FT_Done_Glyph(glyph->border_glyph);

  591.     av_free(elem);

  592.     return 0;

  593. }

  594. 

  595. static av_cold void uninit(AVFilterContext *ctx)

  596. {

  597.     DrawTextContext *s = ctx->priv;

  598. 

  599.     av_expr_free(s->x_pexpr);

  600.     av_expr_free(s->y_pexpr);

  601. #if FF_API_DRAWTEXT_OLD_TIMELINE

  602.     av_expr_free(s->draw_pexpr);

  603.     s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;

  604. #endif

  605.     av_freep(&s->positions);

  606.     s->nb_positions = 0;

  607. 

  608. 

  609.     av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free);

  610.     av_tree_destroy(s->glyphs);

  611.     s->glyphs = NULL;

  612. 

  613.     FT_Done_Face(s->face);

  614.     FT_Stroker_Done(s->stroker);

  615.     FT_Done_FreeType(s->library);

  616. 

  617.     av_bprint_finalize(&s->expanded_text, NULL);

  618. }

  619. 

  620. static inline int is_newline(uint32_t c)

  621. {

  622.     return c == '\n' || c == '\r' || c == '\f' || c == '\v';

  623. }

  624. 

  625. static int config_input(AVFilterLink *inlink)

  626. {

  627.     AVFilterContext *ctx = inlink->dst;

  628.     DrawTextContext *s = ctx->priv;

  629.     int ret;

  630. 

  631.     ff_draw_init(&s->dc, inlink->format, 0);

  632.     ff_draw_color(&s->dc, &s->fontcolor,   s->fontcolor.rgba);

  633.     ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);

  634.     ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);

  635.     ff_draw_color(&s->dc, &s->boxcolor,    s->boxcolor.rgba);

  636. 

  637.     s->var_values[VAR_w]     = s->var_values[VAR_W]     = s->var_values[VAR_MAIN_W] = inlink->w;

  638.     s->var_values[VAR_h]     = s->var_values[VAR_H]     = s->var_values[VAR_MAIN_H] = inlink->h;

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

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

  641.     s->var_values[VAR_HSUB]  = 1 << s->dc.hsub_max;

  642.     s->var_values[VAR_VSUB]  = 1 << s->dc.vsub_max;

  643.     s->var_values[VAR_X]     = NAN;

  644.     s->var_values[VAR_Y]     = NAN;

  645.     s->var_values[VAR_T]     = NAN;

  646. 

  647.     av_lfg_init(&s->prng, av_get_random_seed());

  648. 

  649.     av_expr_free(s->x_pexpr);

  650.     av_expr_free(s->y_pexpr);

  651. #if FF_API_DRAWTEXT_OLD_TIMELINE

  652.     av_expr_free(s->draw_pexpr);

  653.     s->x_pexpr = s->y_pexpr = s->draw_pexpr = NULL;

  654. #else

  655.     s->x_pexpr = s->y_pexpr = NULL;

  656. #endif

  657. 

  658.     if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names,

  659.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||

  660.         (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names,

  661.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)

  662. 

  663.         return AVERROR(EINVAL);

  664. #if FF_API_DRAWTEXT_OLD_TIMELINE

  665.     if (s->draw_expr &&

  666.         (ret = av_expr_parse(&s->draw_pexpr, s->draw_expr, var_names,

  667.                              NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)

  668.         return ret;

  669. #endif

  670. 

  671.     return 0;

  672. }

  673. 

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

  675. {

  676.     DrawTextContext *s = ctx->priv;

  677. 

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

  679.         int ret;

  680.         uninit(ctx);

  681.         s->reinit = 1;

  682.         if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)

  683.             return ret;

  684.         if ((ret = init(ctx)) < 0)

  685.             return ret;

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

  687.     }

  688. 

  689.     return AVERROR(ENOSYS);

  690. }

  691. 

  692. static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp,

  693.                           char *fct, unsigned argc, char **argv, int tag)

  694. {

  695.     DrawTextContext *s = ctx->priv;

  696. 

  697.     av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));

  698.     return 0;

  699. }

  700. 

  701. static int func_pts(AVFilterContext *ctx, AVBPrint *bp,

  702.                     char *fct, unsigned argc, char **argv, int tag)

  703. {

  704.     DrawTextContext *s = ctx->priv;

  705.     const char *fmt;

  706.     double pts = s->var_values[VAR_T];

  707.     int ret;

  708. 

  709.     fmt = argc >= 1 ? argv[0] : "flt";

  710.     if (argc >= 2) {

  711.         int64_t delta;

  712.         if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) {

  713.             av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]);

  714.             return ret;

  715.         }

  716.         pts += (double)delta / AV_TIME_BASE;

  717.     }

  718.     if (!strcmp(fmt, "flt")) {

  719.         av_bprintf(bp, "%.6f", s->var_values[VAR_T]);

  720.     } else if (!strcmp(fmt, "hms")) {

  721.         if (isnan(pts)) {

  722.             av_bprintf(bp, " ??:??:??.???");

  723.         } else {

  724.             int64_t ms = round(pts * 1000);

  725.             char sign = ' ';

  726.             if (ms < 0) {

  727.                 sign = '-';

  728.                 ms = -ms;

  729.             }

  730.             av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign,

  731.                        (int)(ms / (60 * 60 * 1000)),

  732.                        (int)(ms / (60 * 1000)) % 60,

  733.                        (int)(ms / 1000) % 60,

  734.                        (int)ms % 1000);

  735.         }

  736.     } else {

  737.         av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);

  738.         return AVERROR(EINVAL);

  739.     }

  740.     return 0;

  741. }

  742. 

  743. static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,

  744.                           char *fct, unsigned argc, char **argv, int tag)

  745. {

  746.     DrawTextContext *s = ctx->priv;

  747. 

  748.     av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);

  749.     return 0;

  750. }

  751. 

  752. static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,

  753.                          char *fct, unsigned argc, char **argv, int tag)

  754. {

  755.     DrawTextContext *s = ctx->priv;

  756.     AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0);

  757. 

  758.     if (e && e->value)

  759.         av_bprintf(bp, "%s", e->value);

  760.     return 0;

  761. }

  762. 

  763. #if !HAVE_LOCALTIME_R

  764. static void localtime_r(const time_t *t, struct tm *tm)

  765. {

  766.     *tm = *localtime(t);

  767. }

  768. #endif

  769. 

  770. static int func_strftime(AVFilterContext *ctx, AVBPrint *bp,

  771.                          char *fct, unsigned argc, char **argv, int tag)

  772. {

  773.     const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S";

  774.     time_t now;

  775.     struct tm tm;

  776. 

  777.     time(&now);

  778.     if (tag == 'L')

  779.         localtime_r(&now, &tm);

  780.     else

  781.         tm = *gmtime(&now);

  782.     av_bprint_strftime(bp, fmt, &tm);

  783.     return 0;

  784. }

  785. 

  786. static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp,

  787.                           char *fct, unsigned argc, char **argv, int tag)

  788. {

  789.     DrawTextContext *s = ctx->priv;

  790.     double res;

  791.     int ret;

  792. 

  793.     ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values,

  794.                                  NULL, NULL, fun2_names, fun2,

  795.                                  &s->prng, 0, ctx);

  796.     if (ret < 0)

  797.         av_log(ctx, AV_LOG_ERROR,

  798.                "Expression '%s' for the expr text expansion function is not valid\n",

  799.                argv[0]);

  800.     else

  801.         av_bprintf(bp, "%f", res);

  802. 

  803.     return ret;

  804. }

  805. 

  806. static const struct drawtext_function {

  807.     const char *name;

  808.     unsigned argc_min, argc_max;

  809.     int tag;                            /**< opaque argument to func */

  810.     int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int);

  811. } functions[] = {

  812.     { "expr",      1, 1, 0,   func_eval_expr },

  813.     { "e",         1, 1, 0,   func_eval_expr },

  814.     { "pict_type", 0, 0, 0,   func_pict_type },

  815.     { "pts",       0, 2, 0,   func_pts      },

  816.     { "gmtime",    0, 1, 'G', func_strftime },

  817.     { "localtime", 0, 1, 'L', func_strftime },

  818.     { "frame_num", 0, 0, 0,   func_frame_num },

  819.     { "n",         0, 0, 0,   func_frame_num },

  820.     { "metadata",  1, 1, 0,   func_metadata },

  821. };

  822. 

  823. static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,

  824.                          unsigned argc, char **argv)

  825. {

  826.     unsigned i;

  827. 

  828.     for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) {

  829.         if (strcmp(fct, functions[i].name))

  830.             continue;

  831.         if (argc < functions[i].argc_min) {

  832.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n",

  833.                    fct, functions[i].argc_min);

  834.             return AVERROR(EINVAL);

  835.         }

  836.         if (argc > functions[i].argc_max) {

  837.             av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n",

  838.                    fct, functions[i].argc_max);

  839.             return AVERROR(EINVAL);

  840.         }

  841.         break;

  842.     }

  843.     if (i >= FF_ARRAY_ELEMS(functions)) {

  844.         av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct);

  845.         return AVERROR(EINVAL);

  846.     }

  847.     return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag);

  848. }

  849. 

  850. static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext)

  851. {

  852.     const char *text = *rtext;

  853.     char *argv[16] = { NULL };

  854.     unsigned argc = 0, i;

  855.     int ret;

  856. 

  857.     if (*text != '{') {

  858.         av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text);

  859.         return AVERROR(EINVAL);

  860.     }

  861.     text++;

  862.     while (1) {

  863.         if (!(argv[argc++] = av_get_token(&text, ":}"))) {

  864.             ret = AVERROR(ENOMEM);

  865.             goto end;

  866.         }

  867.         if (!*text) {

  868.             av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext);

  869.             ret = AVERROR(EINVAL);

  870.             goto end;

  871.         }

  872.         if (argc == FF_ARRAY_ELEMS(argv))

  873.             av_freep(&argv[--argc]); /* error will be caught later */

  874.         if (*text == '}')

  875.             break;

  876.         text++;

  877.     }

  878. 

  879.     if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0)

  880.         goto end;

  881.     ret = 0;

  882.     *rtext = (char *)text + 1;

  883. 

  884. end:

  885.     for (i = 0; i < argc; i++)

  886.         av_freep(&argv[i]);

  887.     return ret;

  888. }

  889. 

  890. static int expand_text(AVFilterContext *ctx)

  891. {

  892.     DrawTextContext *s = ctx->priv;

  893.     char *text = s->text;

  894.     AVBPrint *bp = &s->expanded_text;

  895.     int ret;

  896. 

  897.     av_bprint_clear(bp);

  898.     while (*text) {

  899.         if (*text == '\\' && text[1]) {

  900.             av_bprint_chars(bp, text[1], 1);

  901.             text += 2;

  902.         } else if (*text == '%') {

  903.             text++;

  904.             if ((ret = expand_function(ctx, bp, &text)) < 0)

  905.                 return ret;

  906.         } else {

  907.             av_bprint_chars(bp, *text, 1);

  908.             text++;

  909.         }

  910.     }

  911.     if (!av_bprint_is_complete(bp))

  912.         return AVERROR(ENOMEM);

  913.     return 0;

  914. }

  915. 

  916. static int draw_glyphs(DrawTextContext *s, AVFrame *frame,

  917.                        int width, int height,

  918.                        FFDrawColor *color, int x, int y, int borderw)

  919. {

  920.     char *text = s->expanded_text.str;

  921.     uint32_t code = 0;

  922.     int i, x1, y1;

  923.     uint8_t *p;

  924.     Glyph *glyph = NULL;

  925. 

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

  927.         FT_Bitmap bitmap;

  928.         Glyph dummy = { 0 };

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

  930. 

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

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

  933.             continue;

  934. 

  935.         dummy.code = code;

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

  937. 

  938.         bitmap = borderw ? glyph->border_bitmap : glyph->bitmap;

  939. 

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

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

  942.             return AVERROR(EINVAL);

  943. 

  944.         x1 = s->positions[i].x+s->x+x - borderw;

  945.         y1 = s->positions[i].y+s->y+y - borderw;

  946. 

  947.         ff_blend_mask(&s->dc, color,

  948.                       frame->data, frame->linesize, width, height,

  949.                       bitmap.buffer, bitmap.pitch,

  950.                       bitmap.width, bitmap.rows,

  951.                       bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,

  952.                       0, x1, y1);

  953.     }

  954. 

  955.     return 0;

  956. }

  957. 

  958. static int draw_text(AVFilterContext *ctx, AVFrame *frame,

  959.                      int width, int height)

  960. {

  961.     DrawTextContext *s = ctx->priv;

  962.     AVFilterLink *inlink = ctx->inputs[0];

  963. 

  964.     uint32_t code = 0, prev_code = 0;

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

  966.     int max_text_line_w = 0, len;

  967.     int box_w, box_h;

  968.     char *text;

  969.     uint8_t *p;

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

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

  972.     FT_Vector delta;

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

  974.     Glyph dummy = { 0 };

  975. 

  976.     time_t now = time(0);

  977.     struct tm ltime;

  978.     AVBPrint *bp = &s->expanded_text;

  979. 

  980.     av_bprint_clear(bp);

  981. 

  982.     if(s->basetime != AV_NOPTS_VALUE)

  983.         now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000;

  984. 

  985.     switch (s->exp_mode) {

  986.     case EXP_NONE:

  987.         av_bprintf(bp, "%s", s->text);

  988.         break;

  989.     case EXP_NORMAL:

  990.         if ((ret = expand_text(ctx)) < 0)

  991.             return ret;

  992.         break;

  993.     case EXP_STRFTIME:

  994.         localtime_r(&now, &ltime);

  995.         av_bprint_strftime(bp, s->text, &ltime);

  996.         break;

  997.     }

  998. 

  999.     if (s->tc_opt_string) {

  1000.         char tcbuf[AV_TIMECODE_STR_SIZE];

  1001.         av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count);

  1002.         av_bprint_clear(bp);

  1003.         av_bprintf(bp, "%s%s", s->text, tcbuf);

  1004.     }

  1005. 

  1006.     if (!av_bprint_is_complete(bp))

  1007.         return AVERROR(ENOMEM);

  1008.     text = s->expanded_text.str;

  1009.     if ((len = s->expanded_text.len) > s->nb_positions) {

  1010.         if (!(s->positions =

  1011.               av_realloc(s->positions, len*sizeof(*s->positions))))

  1012.             return AVERROR(ENOMEM);

  1013.         s->nb_positions = len;

  1014.     }

  1015. 

  1016.     x = 0;

  1017.     y = 0;

  1018. 

  1019.     /* load and cache glyphs */

  1020.     for (i = 0, p = text; *p; i++) {

  1021.         GET_UTF8(code, *p++, continue;);

  1022. 

  1023.         /* get glyph */

  1024.         dummy.code = code;

  1025.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1026.         if (!glyph) {

  1027.             load_glyph(ctx, &glyph, code);

  1028.         }

  1029. 

  1030.         y_min = FFMIN(glyph->bbox.yMin, y_min);

  1031.         y_max = FFMAX(glyph->bbox.yMax, y_max);

  1032.         x_min = FFMIN(glyph->bbox.xMin, x_min);

  1033.         x_max = FFMAX(glyph->bbox.xMax, x_max);

  1034.     }

  1035.     s->max_glyph_h = y_max - y_min;

  1036.     s->max_glyph_w = x_max - x_min;

  1037. 

  1038.     /* compute and save position for each glyph */

  1039.     glyph = NULL;

  1040.     for (i = 0, p = text; *p; i++) {

  1041.         GET_UTF8(code, *p++, continue;);

  1042. 

  1043.         /* skip the \n in the sequence \r\n */

  1044.         if (prev_code == '\r' && code == '\n')

  1045.             continue;

  1046. 

  1047.         prev_code = code;

  1048.         if (is_newline(code)) {

  1049. 

  1050.             max_text_line_w = FFMAX(max_text_line_w, x);

  1051.             y += s->max_glyph_h;

  1052.             x = 0;

  1053.             continue;

  1054.         }

  1055. 

  1056.         /* get glyph */

  1057.         prev_glyph = glyph;

  1058.         dummy.code = code;

  1059.         glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);

  1060. 

  1061.         /* kerning */

  1062.         if (s->use_kerning && prev_glyph && glyph->code) {

  1063.             FT_Get_Kerning(s->face, prev_glyph->code, glyph->code,

  1064.                            ft_kerning_default, &delta);

  1065.             x += delta.x >> 6;

  1066.         }

  1067. 

  1068.         /* save position */

  1069.         s->positions[i].x = x + glyph->bitmap_left;

  1070.         s->positions[i].y = y - glyph->bitmap_top + y_max;

  1071.         if (code == '\t') x  = (x / s->tabsize + 1)*s->tabsize;

  1072.         else              x += glyph->advance;

  1073.     }

  1074. 

  1075.     max_text_line_w = FFMAX(x, max_text_line_w);

  1076. 

  1077.     s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w;

  1078.     s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h;

  1079. 

  1080.     s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w;

  1081.     s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h;

  1082.     s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max;

  1083.     s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min;

  1084. 

  1085.     s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h;

  1086. 

  1087.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1088.     s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);

  1089.     s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);

  1090. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1091.     if (s->draw_pexpr){

  1092.     s->draw = av_expr_eval(s->draw_pexpr, s->var_values, &s->prng);

  1093. 

  1094.     if(!s->draw)

  1095.         return 0;

  1096.     }

  1097.     if (ctx->is_disabled)

  1098.         return 0;

  1099. #endif

  1100. 

  1101.     box_w = FFMIN(width - 1 , max_text_line_w);

  1102.     box_h = FFMIN(height - 1, y + s->max_glyph_h);

  1103. 

  1104.     /* draw box */

  1105.     if (s->draw_box)

  1106.         ff_blend_rectangle(&s->dc, &s->boxcolor,

  1107.                            frame->data, frame->linesize, width, height,

  1108.                            s->x, s->y, box_w, box_h);

  1109. 

  1110.     if (s->shadowx || s->shadowy) {

  1111.         if ((ret = draw_glyphs(s, frame, width, height,

  1112.                                &s->shadowcolor, s->shadowx, s->shadowy, 0)) < 0)

  1113.             return ret;

  1114.     }

  1115. 

  1116.     if (s->borderw) {

  1117.         if ((ret = draw_glyphs(s, frame, width, height,

  1118.                                &s->bordercolor, 0, 0, s->borderw)) < 0)

  1119.             return ret;

  1120.     }

  1121.     if ((ret = draw_glyphs(s, frame, width, height,

  1122.                            &s->fontcolor, 0, 0, 0)) < 0)

  1123.         return ret;

  1124. 

  1125.     return 0;

  1126. }

  1127. 

  1128. static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

  1129. {

  1130.     AVFilterContext *ctx = inlink->dst;

  1131.     AVFilterLink *outlink = ctx->outputs[0];

  1132.     DrawTextContext *s = ctx->priv;

  1133.     int ret;

  1134. 

  1135.     if (s->reload)

  1136.         if ((ret = load_textfile(ctx)) < 0)

  1137.             return ret;

  1138. 

  1139.     s->var_values[VAR_N] = inlink->frame_count+s->start_number;

  1140.     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

  1141.         NAN : frame->pts * av_q2d(inlink->time_base);

  1142. 

  1143.     s->var_values[VAR_PICT_TYPE] = frame->pict_type;

  1144.     s->metadata = av_frame_get_metadata(frame);

  1145. 

  1146.     draw_text(ctx, frame, frame->width, frame->height);

  1147. 

  1148.     av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",

  1149.            (int)s->var_values[VAR_N], s->var_values[VAR_T],

  1150.            (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H],

  1151.            s->x, s->y);

  1152. 

  1153.     return ff_filter_frame(outlink, frame);

  1154. }

  1155. 

  1156. static const AVFilterPad avfilter_vf_drawtext_inputs[] = {

  1157.     {

  1158.         .name           = "default",

  1159.         .type           = AVMEDIA_TYPE_VIDEO,

  1160.         .filter_frame   = filter_frame,

  1161.         .config_props   = config_input,

  1162.         .needs_writable = 1,

  1163.     },

  1164.     { NULL }

  1165. };

  1166. 

  1167. static const AVFilterPad avfilter_vf_drawtext_outputs[] = {

  1168.     {

  1169.         .name = "default",

  1170.         .type = AVMEDIA_TYPE_VIDEO,

  1171.     },

  1172.     { NULL }

  1173. };

  1174. 

  1175. AVFilter ff_vf_drawtext = {

  1176.     .name          = "drawtext",

  1177.     .description   = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),

  1178.     .priv_size     = sizeof(DrawTextContext),

  1179.     .priv_class    = &drawtext_class,

  1180.     .init          = init,

  1181.     .uninit        = uninit,

  1182.     .query_formats = query_formats,

  1183.     .inputs        = avfilter_vf_drawtext_inputs,

  1184.     .outputs       = avfilter_vf_drawtext_outputs,

  1185.     .process_command = command,

  1186. #if FF_API_DRAWTEXT_OLD_TIMELINE

  1187.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,

  1188. #else

  1189.     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,

  1190. #endif

  1191. };