/* * Copyright (c) 2011 Stefano Sabatini * Copyright (c) 2010 S.N. Hemanth Meenakshisundaram * Copyright (c) 2003 Gustavo Sverzut Barbieri * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * drawtext filter, based on the original vhook/drawtext.c * filter by Gustavo Sverzut Barbieri */ #include "config.h" #if HAVE_SYS_TIME_H #include #endif #include #include #include #if HAVE_UNISTD_H #include #endif #include #if CONFIG_LIBFONTCONFIG #include #endif #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "libavutil/common.h" #include "libavutil/file.h" #include "libavutil/eval.h" #include "libavutil/opt.h" #include "libavutil/random_seed.h" #include "libavutil/parseutils.h" #include "libavutil/timecode.h" #include "libavutil/time_internal.h" #include "libavutil/tree.h" #include "libavutil/lfg.h" #include "avfilter.h" #include "drawutils.h" #include "formats.h" #include "internal.h" #include "video.h" #if CONFIG_LIBFRIBIDI #include #endif #include #include FT_FREETYPE_H #include FT_GLYPH_H #include FT_STROKER_H static const char *const var_names[] = { "dar", "hsub", "vsub", "line_h", "lh", ///< line height, same as max_glyph_h "main_h", "h", "H", ///< height of the input video "main_w", "w", "W", ///< width of the input video "max_glyph_a", "ascent", ///< max glyph ascent "max_glyph_d", "descent", ///< min glyph descent "max_glyph_h", ///< max glyph height "max_glyph_w", ///< max glyph width "n", ///< number of frame "sar", "t", ///< timestamp expressed in seconds "text_h", "th", ///< height of the rendered text "text_w", "tw", ///< width of the rendered text "x", "y", "pict_type", "pkt_pos", "pkt_duration", "pkt_size", NULL }; static const char *const fun2_names[] = { "rand" }; static double drand(void *opaque, double min, double max) { return min + (max-min) / UINT_MAX * av_lfg_get(opaque); } typedef double (*eval_func2)(void *, double a, double b); static const eval_func2 fun2[] = { drand, NULL }; enum var_name { VAR_DAR, VAR_HSUB, VAR_VSUB, VAR_LINE_H, VAR_LH, VAR_MAIN_H, VAR_h, VAR_H, VAR_MAIN_W, VAR_w, VAR_W, VAR_MAX_GLYPH_A, VAR_ASCENT, VAR_MAX_GLYPH_D, VAR_DESCENT, VAR_MAX_GLYPH_H, VAR_MAX_GLYPH_W, VAR_N, VAR_SAR, VAR_T, VAR_TEXT_H, VAR_TH, VAR_TEXT_W, VAR_TW, VAR_X, VAR_Y, VAR_PICT_TYPE, VAR_PKT_POS, VAR_PKT_DURATION, VAR_PKT_SIZE, VAR_VARS_NB }; enum expansion_mode { EXP_NONE, EXP_NORMAL, EXP_STRFTIME, }; typedef struct DrawTextContext { const AVClass *class; int exp_mode; ///< expansion mode to use for the text int reinit; ///< tells if the filter is being reinited #if CONFIG_LIBFONTCONFIG uint8_t *font; ///< font to be used #endif uint8_t *fontfile; ///< font to be used uint8_t *text; ///< text to be drawn AVBPrint expanded_text; ///< used to contain the expanded text uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_* FT_Vector *positions; ///< positions for each element in the text size_t nb_positions; ///< number of elements of positions array char *textfile; ///< file with text to be drawn int x; ///< x position to start drawing text int y; ///< y position to start drawing text int max_glyph_w; ///< max glyph width int max_glyph_h; ///< max glyph height int shadowx, shadowy; int borderw; ///< border width char *fontsize_expr; ///< expression for fontsize AVExpr *fontsize_pexpr; ///< parsed expressions for fontsize unsigned int fontsize; ///< font size to use unsigned int default_fontsize; ///< default font size to use int line_spacing; ///< lines spacing in pixels short int draw_box; ///< draw box around text - true or false int boxborderw; ///< box border width int use_kerning; ///< font kerning is used - true/false int tabsize; ///< tab size int fix_bounds; ///< do we let it go out of frame bounds - t/f FFDrawContext dc; FFDrawColor fontcolor; ///< foreground color FFDrawColor shadowcolor; ///< shadow color FFDrawColor bordercolor; ///< border color FFDrawColor boxcolor; ///< background color FT_Library library; ///< freetype font library handle FT_Face face; ///< freetype font face handle FT_Stroker stroker; ///< freetype stroker handle struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code char *x_expr; ///< expression for x position char *y_expr; ///< expression for y position AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y int64_t basetime; ///< base pts time in the real world for display double var_values[VAR_VARS_NB]; char *a_expr; AVExpr *a_pexpr; int alpha; AVLFG prng; ///< random char *tc_opt_string; ///< specified timecode option string AVRational tc_rate; ///< frame rate for timecode AVTimecode tc; ///< timecode context int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise int reload; ///< reload text file for each frame int start_number; ///< starting frame number for n/frame_num var #if CONFIG_LIBFRIBIDI int text_shaping; ///< 1 to shape the text before drawing it #endif AVDictionary *metadata; } DrawTextContext; #define OFFSET(x) offsetof(DrawTextContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption drawtext_options[]= { {"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS}, {"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 , FLAGS}, {"boxborderw", "set box border width", OFFSET(boxborderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, {"line_spacing", "set line spacing in pixels", OFFSET(line_spacing), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX,FLAGS}, {"fontsize", "set font size", OFFSET(fontsize_expr), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX , FLAGS}, {"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS}, {"shadowx", "set shadow x offset", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, {"shadowy", "set shadow y offset", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, {"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS}, {"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS}, {"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS}, #if CONFIG_LIBFONTCONFIG { "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS }, #endif {"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, "expansion"}, {"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"}, {"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"}, {"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"}, {"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS}, {"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS}, {"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS}, {"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS}, {"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS}, {"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS}, { "alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS }, {"fix_bounds", "check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS}, {"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS}, #if CONFIG_LIBFRIBIDI {"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS}, #endif /* FT_LOAD_* flags */ { "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" }, { "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" }, { "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" }, { "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" }, { "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" }, { "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" }, { "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" }, { "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" }, { "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" }, { "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" }, { "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" }, { "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" }, { NULL } }; AVFILTER_DEFINE_CLASS(drawtext); #undef __FTERRORS_H__ #define FT_ERROR_START_LIST { #define FT_ERRORDEF(e, v, s) { (e), (s) }, #define FT_ERROR_END_LIST { 0, NULL } }; static const struct ft_error { int err; const char *err_msg; } ft_errors[] = #include FT_ERRORS_H #define FT_ERRMSG(e) ft_errors[e].err_msg typedef struct Glyph { FT_Glyph glyph; FT_Glyph border_glyph; uint32_t code; unsigned int fontsize; FT_Bitmap bitmap; ///< array holding bitmaps of font FT_Bitmap border_bitmap; ///< array holding bitmaps of font border FT_BBox bbox; int advance; int bitmap_left; int bitmap_top; } Glyph; static int glyph_cmp(const void *key, const void *b) { const Glyph *a = key, *bb = b; int64_t diff = (int64_t)a->code - (int64_t)bb->code; if (diff != 0) return diff > 0 ? 1 : -1; else return FFDIFFSIGN((int64_t)a->fontsize, (int64_t)bb->fontsize); } /** * Load glyphs corresponding to the UTF-32 codepoint code. */ static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code) { DrawTextContext *s = ctx->priv; FT_BitmapGlyph bitmapglyph; Glyph *glyph; struct AVTreeNode *node = NULL; int ret; /* load glyph into s->face->glyph */ if (FT_Load_Char(s->face, code, s->ft_load_flags)) return AVERROR(EINVAL); glyph = av_mallocz(sizeof(*glyph)); if (!glyph) { ret = AVERROR(ENOMEM); goto error; } glyph->code = code; glyph->fontsize = s->fontsize; if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) { ret = AVERROR(EINVAL); goto error; } if (s->borderw) { glyph->border_glyph = glyph->glyph; if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) || FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) { ret = AVERROR_EXTERNAL; goto error; } bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph; glyph->border_bitmap = bitmapglyph->bitmap; } if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) { ret = AVERROR_EXTERNAL; goto error; } bitmapglyph = (FT_BitmapGlyph) glyph->glyph; glyph->bitmap = bitmapglyph->bitmap; glyph->bitmap_left = bitmapglyph->left; glyph->bitmap_top = bitmapglyph->top; glyph->advance = s->face->glyph->advance.x >> 6; /* measure text height to calculate text_height (or the maximum text height) */ FT_Glyph_Get_CBox(glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox); /* cache the newly created glyph */ if (!(node = av_tree_node_alloc())) { ret = AVERROR(ENOMEM); goto error; } av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node); if (glyph_ptr) *glyph_ptr = glyph; return 0; error: if (glyph) av_freep(&glyph->glyph); av_freep(&glyph); av_freep(&node); return ret; } static av_cold int set_fontsize(AVFilterContext *ctx, unsigned int fontsize) { int err; DrawTextContext *s = ctx->priv; if ((err = FT_Set_Pixel_Sizes(s->face, 0, fontsize))) { av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n", fontsize, FT_ERRMSG(err)); return AVERROR(EINVAL); } s->fontsize = fontsize; return 0; } static av_cold int parse_fontsize(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; int err; if (s->fontsize_pexpr) return 0; if (s->fontsize_expr == NULL) return AVERROR(EINVAL); if ((err = av_expr_parse(&s->fontsize_pexpr, s->fontsize_expr, var_names, NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) return err; return 0; } static av_cold int update_fontsize(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; unsigned int fontsize = s->default_fontsize; int err; double size, roundedsize; // if no fontsize specified use the default if (s->fontsize_expr != NULL) { if ((err = parse_fontsize(ctx)) < 0) return err; size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng); if (!isnan(size)) { roundedsize = round(size); // test for overflow before cast if (!(roundedsize > INT_MIN && roundedsize < INT_MAX)) { av_log(ctx, AV_LOG_ERROR, "fontsize overflow\n"); return AVERROR(EINVAL); } fontsize = roundedsize; } } if (fontsize == 0) fontsize = 1; // no change if (fontsize == s->fontsize) return 0; return set_fontsize(ctx, fontsize); } static int load_font_file(AVFilterContext *ctx, const char *path, int index) { DrawTextContext *s = ctx->priv; int err; err = FT_New_Face(s->library, path, index, &s->face); if (err) { #if !CONFIG_LIBFONTCONFIG av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n", s->fontfile, FT_ERRMSG(err)); #endif return AVERROR(EINVAL); } return 0; } #if CONFIG_LIBFONTCONFIG static int load_font_fontconfig(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; FcConfig *fontconfig; FcPattern *pat, *best; FcResult result = FcResultMatch; FcChar8 *filename; int index; double size; int err = AVERROR(ENOENT); int parse_err; fontconfig = FcInitLoadConfigAndFonts(); if (!fontconfig) { av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n"); return AVERROR_UNKNOWN; } pat = FcNameParse(s->fontfile ? s->fontfile : (uint8_t *)(intptr_t)"default"); if (!pat) { av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat"); return AVERROR(EINVAL); } FcPatternAddString(pat, FC_FAMILY, s->font); parse_err = parse_fontsize(ctx); if (!parse_err) { double size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng); if (isnan(size)) { av_log(ctx, AV_LOG_ERROR, "impossible to find font information"); return AVERROR(EINVAL); } FcPatternAddDouble(pat, FC_SIZE, size); } FcDefaultSubstitute(pat); if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) { av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */ FcPatternDestroy(pat); return AVERROR(ENOMEM); } best = FcFontMatch(fontconfig, pat, &result); FcPatternDestroy(pat); if (!best || result != FcResultMatch) { av_log(ctx, AV_LOG_ERROR, "Cannot find a valid font for the family %s\n", s->font); goto fail; } if ( FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch || FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) { av_log(ctx, AV_LOG_ERROR, "impossible to find font information"); return AVERROR(EINVAL); } if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) { av_log(ctx, AV_LOG_ERROR, "No file path for %s\n", s->font); goto fail; } av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename); if (parse_err) s->default_fontsize = size + 0.5; err = load_font_file(ctx, filename, index); if (err) return err; FcConfigDestroy(fontconfig); fail: FcPatternDestroy(best); return err; } #endif static int load_font(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; int err; /* load the face, and set up the encoding, which is by default UTF-8 */ err = load_font_file(ctx, s->fontfile, 0); if (!err) return 0; #if CONFIG_LIBFONTCONFIG err = load_font_fontconfig(ctx); if (!err) return 0; #endif return err; } static int load_textfile(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; int err; uint8_t *textbuf; uint8_t *tmp; size_t textbuf_size; if ((err = av_file_map(s->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) { av_log(ctx, AV_LOG_ERROR, "The text file '%s' could not be read or is empty\n", s->textfile); return err; } if (textbuf_size > SIZE_MAX - 1 || !(tmp = av_realloc(s->text, textbuf_size + 1))) { av_file_unmap(textbuf, textbuf_size); return AVERROR(ENOMEM); } s->text = tmp; memcpy(s->text, textbuf, textbuf_size); s->text[textbuf_size] = 0; av_file_unmap(textbuf, textbuf_size); return 0; } static inline int is_newline(uint32_t c) { return c == '\n' || c == '\r' || c == '\f' || c == '\v'; } #if CONFIG_LIBFRIBIDI static int shape_text(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; uint8_t *tmp; int ret = AVERROR(ENOMEM); static const FriBidiFlags flags = FRIBIDI_FLAGS_DEFAULT | FRIBIDI_FLAGS_ARABIC; FriBidiChar *unicodestr = NULL; FriBidiStrIndex len; FriBidiParType direction = FRIBIDI_PAR_LTR; FriBidiStrIndex line_start = 0; FriBidiStrIndex line_end = 0; FriBidiLevel *embedding_levels = NULL; FriBidiArabicProp *ar_props = NULL; FriBidiCharType *bidi_types = NULL; FriBidiStrIndex i,j; len = strlen(s->text); if (!(unicodestr = av_malloc_array(len, sizeof(*unicodestr)))) { goto out; } len = fribidi_charset_to_unicode(FRIBIDI_CHAR_SET_UTF8, s->text, len, unicodestr); bidi_types = av_malloc_array(len, sizeof(*bidi_types)); if (!bidi_types) { goto out; } fribidi_get_bidi_types(unicodestr, len, bidi_types); embedding_levels = av_malloc_array(len, sizeof(*embedding_levels)); if (!embedding_levels) { goto out; } if (!fribidi_get_par_embedding_levels(bidi_types, len, &direction, embedding_levels)) { goto out; } ar_props = av_malloc_array(len, sizeof(*ar_props)); if (!ar_props) { goto out; } fribidi_get_joining_types(unicodestr, len, ar_props); fribidi_join_arabic(bidi_types, len, embedding_levels, ar_props); fribidi_shape(flags, embedding_levels, len, ar_props, unicodestr); for (line_end = 0, line_start = 0; line_end < len; line_end++) { if (is_newline(unicodestr[line_end]) || line_end == len - 1) { if (!fribidi_reorder_line(flags, bidi_types, line_end - line_start + 1, line_start, direction, embedding_levels, unicodestr, NULL)) { goto out; } line_start = line_end + 1; } } /* Remove zero-width fill chars put in by libfribidi */ for (i = 0, j = 0; i < len; i++) if (unicodestr[i] != FRIBIDI_CHAR_FILL) unicodestr[j++] = unicodestr[i]; len = j; if (!(tmp = av_realloc(s->text, (len * 4 + 1) * sizeof(*s->text)))) { /* Use len * 4, as a unicode character can be up to 4 bytes in UTF-8 */ goto out; } s->text = tmp; len = fribidi_unicode_to_charset(FRIBIDI_CHAR_SET_UTF8, unicodestr, len, s->text); ret = 0; out: av_free(unicodestr); av_free(embedding_levels); av_free(ar_props); av_free(bidi_types); return ret; } #endif static av_cold int init(AVFilterContext *ctx) { int err; DrawTextContext *s = ctx->priv; Glyph *glyph; av_expr_free(s->fontsize_pexpr); s->fontsize_pexpr = NULL; s->fontsize = 0; s->default_fontsize = 16; if (!s->fontfile && !CONFIG_LIBFONTCONFIG) { av_log(ctx, AV_LOG_ERROR, "No font filename provided\n"); return AVERROR(EINVAL); } if (s->textfile) { if (s->text) { av_log(ctx, AV_LOG_ERROR, "Both text and text file provided. Please provide only one\n"); return AVERROR(EINVAL); } if ((err = load_textfile(ctx)) < 0) return err; } if (s->reload && !s->textfile) av_log(ctx, AV_LOG_WARNING, "No file to reload\n"); if (s->tc_opt_string) { int ret = av_timecode_init_from_string(&s->tc, s->tc_rate, s->tc_opt_string, ctx); if (ret < 0) return ret; if (s->tc24hmax) s->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX; if (!s->text) s->text = av_strdup(""); } if (!s->text) { av_log(ctx, AV_LOG_ERROR, "Either text, a valid file or a timecode must be provided\n"); return AVERROR(EINVAL); } #if CONFIG_LIBFRIBIDI if (s->text_shaping) if ((err = shape_text(ctx)) < 0) return err; #endif if ((err = FT_Init_FreeType(&(s->library)))) { av_log(ctx, AV_LOG_ERROR, "Could not load FreeType: %s\n", FT_ERRMSG(err)); return AVERROR(EINVAL); } if ((err = load_font(ctx)) < 0) return err; if ((err = update_fontsize(ctx)) < 0) return err; if (s->borderw) { if (FT_Stroker_New(s->library, &s->stroker)) { av_log(ctx, AV_LOG_ERROR, "Coult not init FT stroker\n"); return AVERROR_EXTERNAL; } FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND, FT_STROKER_LINEJOIN_ROUND, 0); } s->use_kerning = FT_HAS_KERNING(s->face); /* load the fallback glyph with code 0 */ load_glyph(ctx, NULL, 0); /* set the tabsize in pixels */ if ((err = load_glyph(ctx, &glyph, ' ')) < 0) { av_log(ctx, AV_LOG_ERROR, "Could not set tabsize.\n"); return err; } s->tabsize *= glyph->advance; if (s->exp_mode == EXP_STRFTIME && (strchr(s->text, '%') || strchr(s->text, '\\'))) av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n"); av_bprint_init(&s->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED); av_bprint_init(&s->expanded_fontcolor, 0, AV_BPRINT_SIZE_UNLIMITED); return 0; } static int query_formats(AVFilterContext *ctx) { return ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0)); } static int glyph_enu_free(void *opaque, void *elem) { Glyph *glyph = elem; FT_Done_Glyph(glyph->glyph); FT_Done_Glyph(glyph->border_glyph); av_free(elem); return 0; } static av_cold void uninit(AVFilterContext *ctx) { DrawTextContext *s = ctx->priv; av_expr_free(s->x_pexpr); av_expr_free(s->y_pexpr); av_expr_free(s->a_pexpr); av_expr_free(s->fontsize_pexpr); s->x_pexpr = s->y_pexpr = s->a_pexpr = s->fontsize_pexpr = NULL; av_freep(&s->positions); s->nb_positions = 0; av_tree_enumerate(s->glyphs, NULL, NULL, glyph_enu_free); av_tree_destroy(s->glyphs); s->glyphs = NULL; FT_Done_Face(s->face); FT_Stroker_Done(s->stroker); FT_Done_FreeType(s->library); av_bprint_finalize(&s->expanded_text, NULL); av_bprint_finalize(&s->expanded_fontcolor, NULL); } static int config_input(AVFilterLink *inlink) { AVFilterContext *ctx = inlink->dst; DrawTextContext *s = ctx->priv; int ret; ff_draw_init(&s->dc, inlink->format, FF_DRAW_PROCESS_ALPHA); ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba); ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba); ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba); ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba); s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w; s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h; s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1; s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR]; s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max; s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max; s->var_values[VAR_X] = NAN; s->var_values[VAR_Y] = NAN; s->var_values[VAR_T] = NAN; av_lfg_init(&s->prng, av_get_random_seed()); av_expr_free(s->x_pexpr); av_expr_free(s->y_pexpr); av_expr_free(s->a_pexpr); s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL; if ((ret = av_expr_parse(&s->x_pexpr, s->x_expr, var_names, NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || (ret = av_expr_parse(&s->y_pexpr, s->y_expr, var_names, NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 || (ret = av_expr_parse(&s->a_pexpr, s->a_expr, var_names, NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) return AVERROR(EINVAL); return 0; } static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags) { DrawTextContext *old = ctx->priv; DrawTextContext *new = NULL; int ret; if (!strcmp(cmd, "reinit")) { new = av_mallocz(sizeof(DrawTextContext)); if (!new) return AVERROR(ENOMEM); new->class = &drawtext_class; ret = av_opt_copy(new, old); if (ret < 0) goto fail; ctx->priv = new; ret = av_set_options_string(ctx, arg, "=", ":"); if (ret < 0) { ctx->priv = old; goto fail; } ret = init(ctx); if (ret < 0) { uninit(ctx); ctx->priv = old; goto fail; } new->reinit = 1; ctx->priv = old; uninit(ctx); av_freep(&old); ctx->priv = new; return config_input(ctx->inputs[0]); } else return AVERROR(ENOSYS); fail: av_log(ctx, AV_LOG_ERROR, "Failed to process command. Continuing with existing parameters.\n"); av_freep(&new); return ret; } static int func_pict_type(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE])); return 0; } static int func_pts(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; const char *fmt; double pts = s->var_values[VAR_T]; int ret; fmt = argc >= 1 ? argv[0] : "flt"; if (argc >= 2) { int64_t delta; if ((ret = av_parse_time(&delta, argv[1], 1)) < 0) { av_log(ctx, AV_LOG_ERROR, "Invalid delta '%s'\n", argv[1]); return ret; } pts += (double)delta / AV_TIME_BASE; } if (!strcmp(fmt, "flt")) { av_bprintf(bp, "%.6f", pts); } else if (!strcmp(fmt, "hms")) { if (isnan(pts)) { av_bprintf(bp, " ??:??:??.???"); } else { int64_t ms = llrint(pts * 1000); char sign = ' '; if (ms < 0) { sign = '-'; ms = -ms; } if (argc >= 3) { if (!strcmp(argv[2], "24HH")) { ms %= 24 * 60 * 60 * 1000; } else { av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", argv[2]); return AVERROR(EINVAL); } } av_bprintf(bp, "%c%02d:%02d:%02d.%03d", sign, (int)(ms / (60 * 60 * 1000)), (int)(ms / (60 * 1000)) % 60, (int)(ms / 1000) % 60, (int)(ms % 1000)); } } else if (!strcmp(fmt, "localtime") || !strcmp(fmt, "gmtime")) { struct tm tm; time_t ms = (time_t)pts; const char *timefmt = argc >= 3 ? argv[2] : "%Y-%m-%d %H:%M:%S"; if (!strcmp(fmt, "localtime")) localtime_r(&ms, &tm); else gmtime_r(&ms, &tm); av_bprint_strftime(bp, timefmt, &tm); } else { av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt); return AVERROR(EINVAL); } return 0; } static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; av_bprintf(bp, "%d", (int)s->var_values[VAR_N]); return 0; } static int func_metadata(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; AVDictionaryEntry *e = av_dict_get(s->metadata, argv[0], NULL, 0); if (e && e->value) av_bprintf(bp, "%s", e->value); else if (argc >= 2) av_bprintf(bp, "%s", argv[1]); return 0; } static int func_strftime(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { const char *fmt = argc ? argv[0] : "%Y-%m-%d %H:%M:%S"; time_t now; struct tm tm; time(&now); if (tag == 'L') localtime_r(&now, &tm); else tm = *gmtime_r(&now, &tm); av_bprint_strftime(bp, fmt, &tm); return 0; } static int func_eval_expr(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; double res; int ret; ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values, NULL, NULL, fun2_names, fun2, &s->prng, 0, ctx); if (ret < 0) av_log(ctx, AV_LOG_ERROR, "Expression '%s' for the expr text expansion function is not valid\n", argv[0]); else av_bprintf(bp, "%f", res); return ret; } static int func_eval_expr_int_format(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv, int tag) { DrawTextContext *s = ctx->priv; double res; int intval; int ret; unsigned int positions = 0; char fmt_str[30] = "%"; /* * argv[0] expression to be converted to `int` * argv[1] format: 'x', 'X', 'd' or 'u' * argv[2] positions printed (optional) */ ret = av_expr_parse_and_eval(&res, argv[0], var_names, s->var_values, NULL, NULL, fun2_names, fun2, &s->prng, 0, ctx); if (ret < 0) { av_log(ctx, AV_LOG_ERROR, "Expression '%s' for the expr text expansion function is not valid\n", argv[0]); return ret; } if (!strchr("xXdu", argv[1][0])) { av_log(ctx, AV_LOG_ERROR, "Invalid format '%c' specified," " allowed values: 'x', 'X', 'd', 'u'\n", argv[1][0]); return AVERROR(EINVAL); } if (argc == 3) { ret = sscanf(argv[2], "%u", &positions); if (ret != 1) { av_log(ctx, AV_LOG_ERROR, "expr_int_format(): Invalid number of positions" " to print: '%s'\n", argv[2]); return AVERROR(EINVAL); } } feclearexcept(FE_ALL_EXCEPT); intval = res; if ((ret = fetestexcept(FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW))) { av_log(ctx, AV_LOG_ERROR, "Conversion of floating-point result to int failed. Control register: 0x%08x. Conversion result: %d\n", ret, intval); return AVERROR(EINVAL); } if (argc == 3) av_strlcatf(fmt_str, sizeof(fmt_str), "0%u", positions); av_strlcatf(fmt_str, sizeof(fmt_str), "%c", argv[1][0]); av_log(ctx, AV_LOG_DEBUG, "Formatting value %f (expr '%s') with spec '%s'\n", res, argv[0], fmt_str); av_bprintf(bp, fmt_str, intval); return 0; } static const struct drawtext_function { const char *name; unsigned argc_min, argc_max; int tag; /**< opaque argument to func */ int (*func)(AVFilterContext *, AVBPrint *, char *, unsigned, char **, int); } functions[] = { { "expr", 1, 1, 0, func_eval_expr }, { "e", 1, 1, 0, func_eval_expr }, { "expr_int_format", 2, 3, 0, func_eval_expr_int_format }, { "eif", 2, 3, 0, func_eval_expr_int_format }, { "pict_type", 0, 0, 0, func_pict_type }, { "pts", 0, 3, 0, func_pts }, { "gmtime", 0, 1, 'G', func_strftime }, { "localtime", 0, 1, 'L', func_strftime }, { "frame_num", 0, 0, 0, func_frame_num }, { "n", 0, 0, 0, func_frame_num }, { "metadata", 1, 2, 0, func_metadata }, }; static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct, unsigned argc, char **argv) { unsigned i; for (i = 0; i < FF_ARRAY_ELEMS(functions); i++) { if (strcmp(fct, functions[i].name)) continue; if (argc < functions[i].argc_min) { av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at least %d arguments\n", fct, functions[i].argc_min); return AVERROR(EINVAL); } if (argc > functions[i].argc_max) { av_log(ctx, AV_LOG_ERROR, "%%{%s} requires at most %d arguments\n", fct, functions[i].argc_max); return AVERROR(EINVAL); } break; } if (i >= FF_ARRAY_ELEMS(functions)) { av_log(ctx, AV_LOG_ERROR, "%%{%s} is not known\n", fct); return AVERROR(EINVAL); } return functions[i].func(ctx, bp, fct, argc, argv, functions[i].tag); } static int expand_function(AVFilterContext *ctx, AVBPrint *bp, char **rtext) { const char *text = *rtext; char *argv[16] = { NULL }; unsigned argc = 0, i; int ret; if (*text != '{') { av_log(ctx, AV_LOG_ERROR, "Stray %% near '%s'\n", text); return AVERROR(EINVAL); } text++; while (1) { if (!(argv[argc++] = av_get_token(&text, ":}"))) { ret = AVERROR(ENOMEM); goto end; } if (!*text) { av_log(ctx, AV_LOG_ERROR, "Unterminated %%{} near '%s'\n", *rtext); ret = AVERROR(EINVAL); goto end; } if (argc == FF_ARRAY_ELEMS(argv)) av_freep(&argv[--argc]); /* error will be caught later */ if (*text == '}') break; text++; } if ((ret = eval_function(ctx, bp, argv[0], argc - 1, argv + 1)) < 0) goto end; ret = 0; *rtext = (char *)text + 1; end: for (i = 0; i < argc; i++) av_freep(&argv[i]); return ret; } static int expand_text(AVFilterContext *ctx, char *text, AVBPrint *bp) { int ret; av_bprint_clear(bp); while (*text) { if (*text == '\\' && text[1]) { av_bprint_chars(bp, text[1], 1); text += 2; } else if (*text == '%') { text++; if ((ret = expand_function(ctx, bp, &text)) < 0) return ret; } else { av_bprint_chars(bp, *text, 1); text++; } } if (!av_bprint_is_complete(bp)) return AVERROR(ENOMEM); return 0; } static int draw_glyphs(DrawTextContext *s, AVFrame *frame, int width, int height, FFDrawColor *color, int x, int y, int borderw) { char *text = s->expanded_text.str; uint32_t code = 0; int i, x1, y1; uint8_t *p; Glyph *glyph = NULL; for (i = 0, p = text; *p; i++) { FT_Bitmap bitmap; Glyph dummy = { 0 }; GET_UTF8(code, *p++, continue;); /* skip new line chars, just go to new line */ if (code == '\n' || code == '\r' || code == '\t') continue; dummy.code = code; dummy.fontsize = s->fontsize; glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL); bitmap = borderw ? glyph->border_bitmap : glyph->bitmap; if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO && glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY) return AVERROR(EINVAL); x1 = s->positions[i].x+s->x+x - borderw; y1 = s->positions[i].y+s->y+y - borderw; ff_blend_mask(&s->dc, color, frame->data, frame->linesize, width, height, bitmap.buffer, bitmap.pitch, bitmap.width, bitmap.rows, bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3, 0, x1, y1); } return 0; } static void update_color_with_alpha(DrawTextContext *s, FFDrawColor *color, const FFDrawColor incolor) { *color = incolor; color->rgba[3] = (color->rgba[3] * s->alpha) / 255; ff_draw_color(&s->dc, color, color->rgba); } static void update_alpha(DrawTextContext *s) { double alpha = av_expr_eval(s->a_pexpr, s->var_values, &s->prng); if (isnan(alpha)) return; if (alpha >= 1.0) s->alpha = 255; else if (alpha <= 0) s->alpha = 0; else s->alpha = 256 * alpha; } static int draw_text(AVFilterContext *ctx, AVFrame *frame, int width, int height) { DrawTextContext *s = ctx->priv; AVFilterLink *inlink = ctx->inputs[0]; uint32_t code = 0, prev_code = 0; int x = 0, y = 0, i = 0, ret; int max_text_line_w = 0, len; int box_w, box_h; char *text; uint8_t *p; int y_min = 32000, y_max = -32000; int x_min = 32000, x_max = -32000; FT_Vector delta; Glyph *glyph = NULL, *prev_glyph = NULL; Glyph dummy = { 0 }; time_t now = time(0); struct tm ltime; AVBPrint *bp = &s->expanded_text; FFDrawColor fontcolor; FFDrawColor shadowcolor; FFDrawColor bordercolor; FFDrawColor boxcolor; av_bprint_clear(bp); if(s->basetime != AV_NOPTS_VALUE) now= frame->pts*av_q2d(ctx->inputs[0]->time_base) + s->basetime/1000000; switch (s->exp_mode) { case EXP_NONE: av_bprintf(bp, "%s", s->text); break; case EXP_NORMAL: if ((ret = expand_text(ctx, s->text, &s->expanded_text)) < 0) return ret; break; case EXP_STRFTIME: localtime_r(&now, <ime); av_bprint_strftime(bp, s->text, <ime); break; } if (s->tc_opt_string) { char tcbuf[AV_TIMECODE_STR_SIZE]; av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out); av_bprint_clear(bp); av_bprintf(bp, "%s%s", s->text, tcbuf); } if (!av_bprint_is_complete(bp)) return AVERROR(ENOMEM); text = s->expanded_text.str; if ((len = s->expanded_text.len) > s->nb_positions) { if (!(s->positions = av_realloc(s->positions, len*sizeof(*s->positions)))) return AVERROR(ENOMEM); s->nb_positions = len; } if (s->fontcolor_expr[0]) { /* If expression is set, evaluate and replace the static value */ av_bprint_clear(&s->expanded_fontcolor); if ((ret = expand_text(ctx, s->fontcolor_expr, &s->expanded_fontcolor)) < 0) return ret; if (!av_bprint_is_complete(&s->expanded_fontcolor)) return AVERROR(ENOMEM); av_log(s, AV_LOG_DEBUG, "Evaluated fontcolor is '%s'\n", s->expanded_fontcolor.str); ret = av_parse_color(s->fontcolor.rgba, s->expanded_fontcolor.str, -1, s); if (ret) return ret; ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba); } x = 0; y = 0; if ((ret = update_fontsize(ctx)) < 0) return ret; /* load and cache glyphs */ for (i = 0, p = text; *p; i++) { GET_UTF8(code, *p++, continue;); /* get glyph */ dummy.code = code; dummy.fontsize = s->fontsize; glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL); if (!glyph) { ret = load_glyph(ctx, &glyph, code); if (ret < 0) return ret; } y_min = FFMIN(glyph->bbox.yMin, y_min); y_max = FFMAX(glyph->bbox.yMax, y_max); x_min = FFMIN(glyph->bbox.xMin, x_min); x_max = FFMAX(glyph->bbox.xMax, x_max); } s->max_glyph_h = y_max - y_min; s->max_glyph_w = x_max - x_min; /* compute and save position for each glyph */ glyph = NULL; for (i = 0, p = text; *p; i++) { GET_UTF8(code, *p++, continue;); /* skip the \n in the sequence \r\n */ if (prev_code == '\r' && code == '\n') continue; prev_code = code; if (is_newline(code)) { max_text_line_w = FFMAX(max_text_line_w, x); y += s->max_glyph_h + s->line_spacing; x = 0; continue; } /* get glyph */ prev_glyph = glyph; dummy.code = code; dummy.fontsize = s->fontsize; glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL); /* kerning */ if (s->use_kerning && prev_glyph && glyph->code) { FT_Get_Kerning(s->face, prev_glyph->code, glyph->code, ft_kerning_default, &delta); x += delta.x >> 6; } /* save position */ s->positions[i].x = x + glyph->bitmap_left; s->positions[i].y = y - glyph->bitmap_top + y_max; if (code == '\t') x = (x / s->tabsize + 1)*s->tabsize; else x += glyph->advance; } max_text_line_w = FFMAX(x, max_text_line_w); s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = max_text_line_w; s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = y + s->max_glyph_h; s->var_values[VAR_MAX_GLYPH_W] = s->max_glyph_w; s->var_values[VAR_MAX_GLYPH_H] = s->max_glyph_h; s->var_values[VAR_MAX_GLYPH_A] = s->var_values[VAR_ASCENT ] = y_max; s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = y_min; s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = s->max_glyph_h; s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng); s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng); /* It is necessary if x is expressed from y */ s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng); update_alpha(s); update_color_with_alpha(s, &fontcolor , s->fontcolor ); update_color_with_alpha(s, &shadowcolor, s->shadowcolor); update_color_with_alpha(s, &bordercolor, s->bordercolor); update_color_with_alpha(s, &boxcolor , s->boxcolor ); box_w = max_text_line_w; box_h = y + s->max_glyph_h; if (s->fix_bounds) { /* calculate footprint of text effects */ int boxoffset = s->draw_box ? FFMAX(s->boxborderw, 0) : 0; int borderoffset = s->borderw ? FFMAX(s->borderw, 0) : 0; int offsetleft = FFMAX3(boxoffset, borderoffset, (s->shadowx < 0 ? FFABS(s->shadowx) : 0)); int offsettop = FFMAX3(boxoffset, borderoffset, (s->shadowy < 0 ? FFABS(s->shadowy) : 0)); int offsetright = FFMAX3(boxoffset, borderoffset, (s->shadowx > 0 ? s->shadowx : 0)); int offsetbottom = FFMAX3(boxoffset, borderoffset, (s->shadowy > 0 ? s->shadowy : 0)); if (s->x - offsetleft < 0) s->x = offsetleft; if (s->y - offsettop < 0) s->y = offsettop; if (s->x + box_w + offsetright > width) s->x = FFMAX(width - box_w - offsetright, 0); if (s->y + box_h + offsetbottom > height) s->y = FFMAX(height - box_h - offsetbottom, 0); } /* draw box */ if (s->draw_box) ff_blend_rectangle(&s->dc, &boxcolor, frame->data, frame->linesize, width, height, s->x - s->boxborderw, s->y - s->boxborderw, box_w + s->boxborderw * 2, box_h + s->boxborderw * 2); if (s->shadowx || s->shadowy) { if ((ret = draw_glyphs(s, frame, width, height, &shadowcolor, s->shadowx, s->shadowy, 0)) < 0) return ret; } if (s->borderw) { if ((ret = draw_glyphs(s, frame, width, height, &bordercolor, 0, 0, s->borderw)) < 0) return ret; } if ((ret = draw_glyphs(s, frame, width, height, &fontcolor, 0, 0, 0)) < 0) return ret; return 0; } static int filter_frame(AVFilterLink *inlink, AVFrame *frame) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = ctx->outputs[0]; DrawTextContext *s = ctx->priv; int ret; if (s->reload) { if ((ret = load_textfile(ctx)) < 0) { av_frame_free(&frame); return ret; } #if CONFIG_LIBFRIBIDI if (s->text_shaping) if ((ret = shape_text(ctx)) < 0) { av_frame_free(&frame); return ret; } #endif } s->var_values[VAR_N] = inlink->frame_count_out + s->start_number; s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ? NAN : frame->pts * av_q2d(inlink->time_base); s->var_values[VAR_PICT_TYPE] = frame->pict_type; s->var_values[VAR_PKT_POS] = frame->pkt_pos; s->var_values[VAR_PKT_DURATION] = frame->pkt_duration * av_q2d(inlink->time_base); s->var_values[VAR_PKT_SIZE] = frame->pkt_size; s->metadata = frame->metadata; draw_text(ctx, frame, frame->width, frame->height); av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n", (int)s->var_values[VAR_N], s->var_values[VAR_T], (int)s->var_values[VAR_TEXT_W], (int)s->var_values[VAR_TEXT_H], s->x, s->y); return ff_filter_frame(outlink, frame); } static const AVFilterPad avfilter_vf_drawtext_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_input, .needs_writable = 1, }, { NULL } }; static const AVFilterPad avfilter_vf_drawtext_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { NULL } }; AVFilter ff_vf_drawtext = { .name = "drawtext", .description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."), .priv_size = sizeof(DrawTextContext), .priv_class = &drawtext_class, .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = avfilter_vf_drawtext_inputs, .outputs = avfilter_vf_drawtext_outputs, .process_command = command, .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, };