mirror of
https://github.com/FFmpeg/FFmpeg.git
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1041 lines
37 KiB
C
1041 lines
37 KiB
C
/*
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* Copyright (c) 2011 Stefano Sabatini
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* Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
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* Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* drawtext filter, based on the original vhook/drawtext.c
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* filter by Gustavo Sverzut Barbieri
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*/
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#include <sys/time.h>
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#include <time.h>
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#include "config.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/common.h"
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#include "libavutil/file.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "libavutil/random_seed.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/timecode.h"
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#include "libavutil/tree.h"
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#include "libavutil/lfg.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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#include <ft2build.h>
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#include <freetype/config/ftheader.h>
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
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#if CONFIG_FONTCONFIG
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#include <fontconfig/fontconfig.h>
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#endif
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static const char *const var_names[] = {
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"dar",
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"hsub", "vsub",
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"line_h", "lh", ///< line height, same as max_glyph_h
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"main_h", "h", "H", ///< height of the input video
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"main_w", "w", "W", ///< width of the input video
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"max_glyph_a", "ascent", ///< max glyph ascent
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"max_glyph_d", "descent", ///< min glyph descent
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"max_glyph_h", ///< max glyph height
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"max_glyph_w", ///< max glyph width
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"n", ///< number of frame
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"sar",
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"t", ///< timestamp expressed in seconds
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"text_h", "th", ///< height of the rendered text
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"text_w", "tw", ///< width of the rendered text
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"x",
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"y",
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NULL
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};
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static const char *const fun2_names[] = {
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"rand"
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};
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static double drand(void *opaque, double min, double max)
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{
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return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
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}
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typedef double (*eval_func2)(void *, double a, double b);
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static const eval_func2 fun2[] = {
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drand,
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NULL
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};
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enum var_name {
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VAR_DAR,
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VAR_HSUB, VAR_VSUB,
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VAR_LINE_H, VAR_LH,
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VAR_MAIN_H, VAR_h, VAR_H,
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VAR_MAIN_W, VAR_w, VAR_W,
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VAR_MAX_GLYPH_A, VAR_ASCENT,
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VAR_MAX_GLYPH_D, VAR_DESCENT,
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VAR_MAX_GLYPH_H,
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VAR_MAX_GLYPH_W,
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VAR_N,
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VAR_SAR,
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VAR_T,
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VAR_TEXT_H, VAR_TH,
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VAR_TEXT_W, VAR_TW,
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VAR_X,
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VAR_Y,
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VAR_VARS_NB
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};
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enum expansion_mode {
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EXP_NONE,
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EXP_NORMAL,
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EXP_STRFTIME,
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};
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typedef struct {
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const AVClass *class;
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enum expansion_mode exp_mode; ///< expansion mode to use for the text
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int reinit; ///< tells if the filter is being reinited
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uint8_t *fontfile; ///< font to be used
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uint8_t *text; ///< text to be drawn
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AVBPrint expanded_text; ///< used to contain the expanded text
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int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
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FT_Vector *positions; ///< positions for each element in the text
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size_t nb_positions; ///< number of elements of positions array
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char *textfile; ///< file with text to be drawn
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int x; ///< x position to start drawing text
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int y; ///< y position to start drawing text
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int max_glyph_w; ///< max glyph width
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int max_glyph_h; ///< max glyph height
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int shadowx, shadowy;
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unsigned int fontsize; ///< font size to use
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char *fontcolor_string; ///< font color as string
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char *boxcolor_string; ///< box color as string
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char *shadowcolor_string; ///< shadow color as string
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short int draw_box; ///< draw box around text - true or false
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int use_kerning; ///< font kerning is used - true/false
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int tabsize; ///< tab size
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int fix_bounds; ///< do we let it go out of frame bounds - t/f
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FFDrawContext dc;
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FFDrawColor fontcolor; ///< foreground color
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FFDrawColor shadowcolor; ///< shadow color
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FFDrawColor boxcolor; ///< background color
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FT_Library library; ///< freetype font library handle
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FT_Face face; ///< freetype font face handle
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struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
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char *x_expr; ///< expression for x position
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char *y_expr; ///< expression for y position
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AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
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int64_t basetime; ///< base pts time in the real world for display
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double var_values[VAR_VARS_NB];
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char *draw_expr; ///< expression for draw
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AVExpr *draw_pexpr; ///< parsed expression for draw
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int draw; ///< set to zero to prevent drawing
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AVLFG prng; ///< random
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char *tc_opt_string; ///< specified timecode option string
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AVRational tc_rate; ///< frame rate for timecode
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AVTimecode tc; ///< timecode context
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int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
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int frame_id;
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int reload; ///< reload text file for each frame
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} DrawTextContext;
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#define OFFSET(x) offsetof(DrawTextContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption drawtext_options[]= {
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{"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"fontcolor", "set foreground color", OFFSET(fontcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"boxcolor", "set box color", OFFSET(boxcolor_string), AV_OPT_TYPE_STRING, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"shadowcolor", "set shadow color", OFFSET(shadowcolor_string), AV_OPT_TYPE_STRING, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_INT, {.i64=0}, 0, 1 , FLAGS},
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{"fontsize", "set font size", OFFSET(fontsize), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX , FLAGS},
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{"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"shadowx", "set x", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
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{"shadowy", "set y", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
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{"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX , FLAGS},
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{"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX , FLAGS},
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{"draw", "if false do not draw", OFFSET(draw_expr), AV_OPT_TYPE_STRING, {.str="1"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"expansion","set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_STRFTIME}, 0, 2, FLAGS, "expansion"},
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{"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, "expansion"},
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{"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, "expansion"},
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{"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, "expansion"},
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{"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
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{"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
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{"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
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{"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
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{"reload", "reload text file for each frame", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS},
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{"fix_bounds", "if true, check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS},
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/* FT_LOAD_* flags */
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{"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, {.i64=FT_LOAD_DEFAULT|FT_LOAD_RENDER}, 0, INT_MAX, FLAGS, "ft_load_flags"},
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{"default", "set default", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_DEFAULT}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"no_scale", "set no_scale", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_SCALE}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"no_hinting", "set no_hinting", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_HINTING}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"render", "set render", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_RENDER}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"no_bitmap", "set no_bitmap", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_BITMAP}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"vertical_layout", "set vertical_layout", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_VERTICAL_LAYOUT}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"force_autohint", "set force_autohint", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_FORCE_AUTOHINT}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"crop_bitmap", "set crop_bitmap", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_CROP_BITMAP}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"pedantic", "set pedantic", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_PEDANTIC}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"ignore_global_advance_width", "set ignore_global_advance_width", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"no_recurse", "set no_recurse", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_RECURSE}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"ignore_transform", "set ignore_transform", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_IGNORE_TRANSFORM}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"monochrome", "set monochrome", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_MONOCHROME}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"linear_design", "set linear_design", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_LINEAR_DESIGN}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{"no_autohint", "set no_autohint", 0, AV_OPT_TYPE_CONST, {.i64=FT_LOAD_NO_AUTOHINT}, INT_MIN, INT_MAX, FLAGS, "ft_load_flags"},
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(drawtext);
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#undef __FTERRORS_H__
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#define FT_ERROR_START_LIST {
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#define FT_ERRORDEF(e, v, s) { (e), (s) },
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#define FT_ERROR_END_LIST { 0, NULL } };
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struct ft_error
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{
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int err;
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const char *err_msg;
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} static ft_errors[] =
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#include FT_ERRORS_H
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#define FT_ERRMSG(e) ft_errors[e].err_msg
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typedef struct {
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FT_Glyph *glyph;
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uint32_t code;
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FT_Bitmap bitmap; ///< array holding bitmaps of font
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FT_BBox bbox;
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int advance;
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int bitmap_left;
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int bitmap_top;
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} Glyph;
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static int glyph_cmp(void *key, const void *b)
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{
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const Glyph *a = key, *bb = b;
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int64_t diff = (int64_t)a->code - (int64_t)bb->code;
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return diff > 0 ? 1 : diff < 0 ? -1 : 0;
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}
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/**
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* Load glyphs corresponding to the UTF-32 codepoint code.
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*/
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static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
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{
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DrawTextContext *dtext = ctx->priv;
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Glyph *glyph;
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struct AVTreeNode *node = NULL;
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int ret;
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/* load glyph into dtext->face->glyph */
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if (FT_Load_Char(dtext->face, code, dtext->ft_load_flags))
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return AVERROR(EINVAL);
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/* save glyph */
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if (!(glyph = av_mallocz(sizeof(*glyph))) ||
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!(glyph->glyph = av_mallocz(sizeof(*glyph->glyph)))) {
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ret = AVERROR(ENOMEM);
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goto error;
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}
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glyph->code = code;
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if (FT_Get_Glyph(dtext->face->glyph, glyph->glyph)) {
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ret = AVERROR(EINVAL);
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goto error;
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}
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glyph->bitmap = dtext->face->glyph->bitmap;
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glyph->bitmap_left = dtext->face->glyph->bitmap_left;
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glyph->bitmap_top = dtext->face->glyph->bitmap_top;
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glyph->advance = dtext->face->glyph->advance.x >> 6;
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/* measure text height to calculate text_height (or the maximum text height) */
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FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
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/* cache the newly created glyph */
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if (!(node = av_tree_node_alloc())) {
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ret = AVERROR(ENOMEM);
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goto error;
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}
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av_tree_insert(&dtext->glyphs, glyph, glyph_cmp, &node);
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if (glyph_ptr)
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*glyph_ptr = glyph;
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return 0;
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error:
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if (glyph)
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av_freep(&glyph->glyph);
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av_freep(&glyph);
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av_freep(&node);
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return ret;
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}
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static int load_font_file(AVFilterContext *ctx, const char *path, int index,
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const char **error)
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{
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DrawTextContext *dtext = ctx->priv;
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int err;
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err = FT_New_Face(dtext->library, path, index, &dtext->face);
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if (err) {
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*error = FT_ERRMSG(err);
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return AVERROR(EINVAL);
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}
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return 0;
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}
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#if CONFIG_FONTCONFIG
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static int load_font_fontconfig(AVFilterContext *ctx, const char **error)
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{
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DrawTextContext *dtext = ctx->priv;
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FcConfig *fontconfig;
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FcPattern *pattern, *fpat;
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FcResult result = FcResultMatch;
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FcChar8 *filename;
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int err, index;
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double size;
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fontconfig = FcInitLoadConfigAndFonts();
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if (!fontconfig) {
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*error = "impossible to init fontconfig\n";
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return AVERROR(EINVAL);
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}
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pattern = FcNameParse(dtext->fontfile ? dtext->fontfile :
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(uint8_t *)(intptr_t)"default");
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if (!pattern) {
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*error = "could not parse fontconfig pattern";
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return AVERROR(EINVAL);
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}
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if (!FcConfigSubstitute(fontconfig, pattern, FcMatchPattern)) {
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*error = "could not substitue fontconfig options"; /* very unlikely */
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return AVERROR(EINVAL);
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}
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FcDefaultSubstitute(pattern);
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fpat = FcFontMatch(fontconfig, pattern, &result);
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if (!fpat || result != FcResultMatch) {
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*error = "impossible to find a matching font";
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return AVERROR(EINVAL);
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}
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if (FcPatternGetString (fpat, FC_FILE, 0, &filename) != FcResultMatch ||
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FcPatternGetInteger(fpat, FC_INDEX, 0, &index ) != FcResultMatch ||
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FcPatternGetDouble (fpat, FC_SIZE, 0, &size ) != FcResultMatch) {
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*error = "impossible to find font information";
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return AVERROR(EINVAL);
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}
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av_log(ctx, AV_LOG_INFO, "Using \"%s\"\n", filename);
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if (!dtext->fontsize)
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dtext->fontsize = size + 0.5;
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err = load_font_file(ctx, filename, index, error);
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if (err)
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return err;
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FcPatternDestroy(fpat);
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FcPatternDestroy(pattern);
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FcConfigDestroy(fontconfig);
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return 0;
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}
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#endif
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static int load_font(AVFilterContext *ctx)
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{
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DrawTextContext *dtext = ctx->priv;
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int err;
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const char *error = "unknown error\n";
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/* load the face, and set up the encoding, which is by default UTF-8 */
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err = load_font_file(ctx, dtext->fontfile, 0, &error);
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if (!err)
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return 0;
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#if CONFIG_FONTCONFIG
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err = load_font_fontconfig(ctx, &error);
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if (!err)
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return 0;
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#endif
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av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
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dtext->fontfile, error);
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return err;
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}
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static int load_textfile(AVFilterContext *ctx)
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{
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DrawTextContext *dtext = ctx->priv;
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int err;
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uint8_t *textbuf;
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size_t textbuf_size;
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|
|
if ((err = av_file_map(dtext->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",
|
|
dtext->textfile);
|
|
return err;
|
|
}
|
|
|
|
if (!(dtext->text = av_realloc(dtext->text, textbuf_size + 1)))
|
|
return AVERROR(ENOMEM);
|
|
memcpy(dtext->text, textbuf, textbuf_size);
|
|
dtext->text[textbuf_size] = 0;
|
|
av_file_unmap(textbuf, textbuf_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int init(AVFilterContext *ctx, const char *args)
|
|
{
|
|
int err;
|
|
DrawTextContext *dtext = ctx->priv;
|
|
Glyph *glyph;
|
|
|
|
dtext->class = &drawtext_class;
|
|
av_opt_set_defaults(dtext);
|
|
|
|
if ((err = av_set_options_string(dtext, args, "=", ":")) < 0)
|
|
return err;
|
|
|
|
if (!dtext->fontfile && !CONFIG_FONTCONFIG) {
|
|
av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (dtext->textfile) {
|
|
if (dtext->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 (dtext->reload && !dtext->textfile)
|
|
av_log(ctx, AV_LOG_WARNING, "No file to reload\n");
|
|
|
|
if (dtext->tc_opt_string) {
|
|
int ret = av_timecode_init_from_string(&dtext->tc, dtext->tc_rate,
|
|
dtext->tc_opt_string, ctx);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (dtext->tc24hmax)
|
|
dtext->tc.flags |= AV_TIMECODE_FLAG_24HOURSMAX;
|
|
if (!dtext->text)
|
|
dtext->text = av_strdup("");
|
|
}
|
|
|
|
if (!dtext->text) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Either text, a valid file or a timecode must be provided\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if ((err = av_parse_color(dtext->fontcolor.rgba, dtext->fontcolor_string, -1, ctx))) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Invalid font color '%s'\n", dtext->fontcolor_string);
|
|
return err;
|
|
}
|
|
|
|
if ((err = av_parse_color(dtext->boxcolor.rgba, dtext->boxcolor_string, -1, ctx))) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Invalid box color '%s'\n", dtext->boxcolor_string);
|
|
return err;
|
|
}
|
|
|
|
if ((err = av_parse_color(dtext->shadowcolor.rgba, dtext->shadowcolor_string, -1, ctx))) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Invalid shadow color '%s'\n", dtext->shadowcolor_string);
|
|
return err;
|
|
}
|
|
|
|
if ((err = FT_Init_FreeType(&(dtext->library)))) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Could not load FreeType: %s\n", FT_ERRMSG(err));
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
err = load_font(ctx);
|
|
if (err)
|
|
return err;
|
|
if (!dtext->fontsize)
|
|
dtext->fontsize = 16;
|
|
if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
|
|
av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
|
|
dtext->fontsize, FT_ERRMSG(err));
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
dtext->use_kerning = FT_HAS_KERNING(dtext->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;
|
|
}
|
|
dtext->tabsize *= glyph->advance;
|
|
|
|
if (dtext->exp_mode == EXP_STRFTIME &&
|
|
(strchr(dtext->text, '%') || strchr(dtext->text, '\\')))
|
|
av_log(ctx, AV_LOG_WARNING, "expansion=strftime is deprecated.\n");
|
|
|
|
av_bprint_init(&dtext->expanded_text, 0, AV_BPRINT_SIZE_UNLIMITED);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
|
|
return 0;
|
|
}
|
|
|
|
static int glyph_enu_free(void *opaque, void *elem)
|
|
{
|
|
Glyph *glyph = elem;
|
|
|
|
FT_Done_Glyph(*glyph->glyph);
|
|
av_freep(&glyph->glyph);
|
|
av_free(elem);
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
DrawTextContext *dtext = ctx->priv;
|
|
|
|
av_expr_free(dtext->x_pexpr); dtext->x_pexpr = NULL;
|
|
av_expr_free(dtext->y_pexpr); dtext->y_pexpr = NULL;
|
|
av_expr_free(dtext->draw_pexpr); dtext->draw_pexpr = NULL;
|
|
av_opt_free(dtext);
|
|
|
|
av_freep(&dtext->positions);
|
|
dtext->nb_positions = 0;
|
|
|
|
av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
|
|
av_tree_destroy(dtext->glyphs);
|
|
dtext->glyphs = NULL;
|
|
|
|
FT_Done_Face(dtext->face);
|
|
FT_Done_FreeType(dtext->library);
|
|
|
|
av_bprint_finalize(&dtext->expanded_text, NULL);
|
|
}
|
|
|
|
static inline int is_newline(uint32_t c)
|
|
{
|
|
return c == '\n' || c == '\r' || c == '\f' || c == '\v';
|
|
}
|
|
|
|
static int config_input(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
DrawTextContext *dtext = ctx->priv;
|
|
int ret;
|
|
|
|
ff_draw_init(&dtext->dc, inlink->format, 0);
|
|
ff_draw_color(&dtext->dc, &dtext->fontcolor, dtext->fontcolor.rgba);
|
|
ff_draw_color(&dtext->dc, &dtext->shadowcolor, dtext->shadowcolor.rgba);
|
|
ff_draw_color(&dtext->dc, &dtext->boxcolor, dtext->boxcolor.rgba);
|
|
|
|
dtext->var_values[VAR_w] = dtext->var_values[VAR_W] = dtext->var_values[VAR_MAIN_W] = inlink->w;
|
|
dtext->var_values[VAR_h] = dtext->var_values[VAR_H] = dtext->var_values[VAR_MAIN_H] = inlink->h;
|
|
dtext->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
|
|
dtext->var_values[VAR_DAR] = (double)inlink->w / inlink->h * dtext->var_values[VAR_SAR];
|
|
dtext->var_values[VAR_HSUB] = 1 << dtext->dc.hsub_max;
|
|
dtext->var_values[VAR_VSUB] = 1 << dtext->dc.vsub_max;
|
|
dtext->var_values[VAR_X] = NAN;
|
|
dtext->var_values[VAR_Y] = NAN;
|
|
if (!dtext->reinit)
|
|
dtext->var_values[VAR_N] = 0;
|
|
dtext->var_values[VAR_T] = NAN;
|
|
|
|
av_lfg_init(&dtext->prng, av_get_random_seed());
|
|
|
|
if ((ret = av_expr_parse(&dtext->x_pexpr, dtext->x_expr, var_names,
|
|
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
|
|
(ret = av_expr_parse(&dtext->y_pexpr, dtext->y_expr, var_names,
|
|
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
|
|
(ret = av_expr_parse(&dtext->draw_pexpr, dtext->draw_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 *dtext = ctx->priv;
|
|
|
|
if (!strcmp(cmd, "reinit")) {
|
|
int ret;
|
|
uninit(ctx);
|
|
dtext->reinit = 1;
|
|
if ((ret = init(ctx, arg)) < 0)
|
|
return ret;
|
|
return config_input(ctx->inputs[0]);
|
|
}
|
|
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
|
|
static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
|
|
char *fct, unsigned argc, char **argv, int tag)
|
|
{
|
|
DrawTextContext *dtext = ctx->priv;
|
|
|
|
av_bprintf(bp, "%.6f", dtext->var_values[VAR_T]);
|
|
return 0;
|
|
}
|
|
|
|
static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,
|
|
char *fct, unsigned argc, char **argv, int tag)
|
|
{
|
|
DrawTextContext *dtext = ctx->priv;
|
|
|
|
av_bprintf(bp, "%d", (int)dtext->var_values[VAR_N]);
|
|
return 0;
|
|
}
|
|
|
|
#if !HAVE_LOCALTIME_R
|
|
static void localtime_r(const time_t *t, struct tm *tm)
|
|
{
|
|
*tm = *localtime(t);
|
|
}
|
|
#endif
|
|
|
|
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(&now);
|
|
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 *dtext = ctx->priv;
|
|
double res;
|
|
int ret;
|
|
|
|
ret = av_expr_parse_and_eval(&res, argv[0], var_names, dtext->var_values,
|
|
NULL, NULL, fun2_names, fun2,
|
|
&dtext->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 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 },
|
|
{ "pts", 0, 0, 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 },
|
|
};
|
|
|
|
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)
|
|
{
|
|
DrawTextContext *dtext = ctx->priv;
|
|
char *text = dtext->text;
|
|
AVBPrint *bp = &dtext->expanded_text;
|
|
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 *dtext, AVFilterBufferRef *picref,
|
|
int width, int height, const uint8_t rgbcolor[4], FFDrawColor *color, int x, int y)
|
|
{
|
|
char *text = dtext->expanded_text.str;
|
|
uint32_t code = 0;
|
|
int i, x1, y1;
|
|
uint8_t *p;
|
|
Glyph *glyph = NULL;
|
|
|
|
for (i = 0, p = text; *p; i++) {
|
|
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;
|
|
glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
|
|
|
|
if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
|
|
glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
|
|
return AVERROR(EINVAL);
|
|
|
|
x1 = dtext->positions[i].x+dtext->x+x;
|
|
y1 = dtext->positions[i].y+dtext->y+y;
|
|
|
|
ff_blend_mask(&dtext->dc, color,
|
|
picref->data, picref->linesize, width, height,
|
|
glyph->bitmap.buffer, glyph->bitmap.pitch,
|
|
glyph->bitmap.width, glyph->bitmap.rows,
|
|
glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO ? 0 : 3,
|
|
0, x1, y1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
|
|
int width, int height)
|
|
{
|
|
DrawTextContext *dtext = ctx->priv;
|
|
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 = dtext->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 = &dtext->expanded_text;
|
|
|
|
av_bprint_clear(bp);
|
|
|
|
if(dtext->basetime != AV_NOPTS_VALUE)
|
|
now= picref->pts*av_q2d(ctx->inputs[0]->time_base) + dtext->basetime/1000000;
|
|
|
|
switch (dtext->exp_mode) {
|
|
case EXP_NONE:
|
|
av_bprintf(bp, "%s", dtext->text);
|
|
break;
|
|
case EXP_NORMAL:
|
|
if ((ret = expand_text(ctx)) < 0)
|
|
return ret;
|
|
break;
|
|
case EXP_STRFTIME:
|
|
localtime_r(&now, <ime);
|
|
av_bprint_strftime(bp, dtext->text, <ime);
|
|
break;
|
|
}
|
|
|
|
if (dtext->tc_opt_string) {
|
|
char tcbuf[AV_TIMECODE_STR_SIZE];
|
|
av_timecode_make_string(&dtext->tc, tcbuf, dtext->frame_id++);
|
|
av_bprint_clear(bp);
|
|
av_bprintf(bp, "%s%s", dtext->text, tcbuf);
|
|
}
|
|
|
|
if (!av_bprint_is_complete(bp))
|
|
return AVERROR(ENOMEM);
|
|
text = dtext->expanded_text.str;
|
|
if ((len = dtext->expanded_text.len) > dtext->nb_positions) {
|
|
if (!(dtext->positions =
|
|
av_realloc(dtext->positions, len*sizeof(*dtext->positions))))
|
|
return AVERROR(ENOMEM);
|
|
dtext->nb_positions = len;
|
|
}
|
|
|
|
x = 0;
|
|
y = 0;
|
|
|
|
/* load and cache glyphs */
|
|
for (i = 0, p = text; *p; i++) {
|
|
GET_UTF8(code, *p++, continue;);
|
|
|
|
/* get glyph */
|
|
dummy.code = code;
|
|
glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
|
|
if (!glyph) {
|
|
load_glyph(ctx, &glyph, code);
|
|
}
|
|
|
|
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);
|
|
}
|
|
dtext->max_glyph_h = y_max - y_min;
|
|
dtext->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 += dtext->max_glyph_h;
|
|
x = 0;
|
|
continue;
|
|
}
|
|
|
|
/* get glyph */
|
|
prev_glyph = glyph;
|
|
dummy.code = code;
|
|
glyph = av_tree_find(dtext->glyphs, &dummy, glyph_cmp, NULL);
|
|
|
|
/* kerning */
|
|
if (dtext->use_kerning && prev_glyph && glyph->code) {
|
|
FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
|
|
ft_kerning_default, &delta);
|
|
x += delta.x >> 6;
|
|
}
|
|
|
|
/* save position */
|
|
dtext->positions[i].x = x + glyph->bitmap_left;
|
|
dtext->positions[i].y = y - glyph->bitmap_top + y_max;
|
|
if (code == '\t') x = (x / dtext->tabsize + 1)*dtext->tabsize;
|
|
else x += glyph->advance;
|
|
}
|
|
|
|
max_text_line_w = FFMAX(x, max_text_line_w);
|
|
|
|
dtext->var_values[VAR_TW] = dtext->var_values[VAR_TEXT_W] = max_text_line_w;
|
|
dtext->var_values[VAR_TH] = dtext->var_values[VAR_TEXT_H] = y + dtext->max_glyph_h;
|
|
|
|
dtext->var_values[VAR_MAX_GLYPH_W] = dtext->max_glyph_w;
|
|
dtext->var_values[VAR_MAX_GLYPH_H] = dtext->max_glyph_h;
|
|
dtext->var_values[VAR_MAX_GLYPH_A] = dtext->var_values[VAR_ASCENT ] = y_max;
|
|
dtext->var_values[VAR_MAX_GLYPH_D] = dtext->var_values[VAR_DESCENT] = y_min;
|
|
|
|
dtext->var_values[VAR_LINE_H] = dtext->var_values[VAR_LH] = dtext->max_glyph_h;
|
|
|
|
dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
|
|
dtext->y = dtext->var_values[VAR_Y] = av_expr_eval(dtext->y_pexpr, dtext->var_values, &dtext->prng);
|
|
dtext->x = dtext->var_values[VAR_X] = av_expr_eval(dtext->x_pexpr, dtext->var_values, &dtext->prng);
|
|
dtext->draw = av_expr_eval(dtext->draw_pexpr, dtext->var_values, &dtext->prng);
|
|
|
|
if(!dtext->draw)
|
|
return 0;
|
|
|
|
box_w = FFMIN(width - 1 , max_text_line_w);
|
|
box_h = FFMIN(height - 1, y + dtext->max_glyph_h);
|
|
|
|
/* draw box */
|
|
if (dtext->draw_box)
|
|
ff_blend_rectangle(&dtext->dc, &dtext->boxcolor,
|
|
picref->data, picref->linesize, width, height,
|
|
dtext->x, dtext->y, box_w, box_h);
|
|
|
|
if (dtext->shadowx || dtext->shadowy) {
|
|
if ((ret = draw_glyphs(dtext, picref, width, height, dtext->shadowcolor.rgba,
|
|
&dtext->shadowcolor, dtext->shadowx, dtext->shadowy)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = draw_glyphs(dtext, picref, width, height, dtext->fontcolor.rgba,
|
|
&dtext->fontcolor, 0, 0)) < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
DrawTextContext *dtext = ctx->priv;
|
|
int ret;
|
|
|
|
if (dtext->reload)
|
|
if ((ret = load_textfile(ctx)) < 0)
|
|
return ret;
|
|
|
|
dtext->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
|
|
NAN : frame->pts * av_q2d(inlink->time_base);
|
|
|
|
draw_text(ctx, frame, frame->video->w, frame->video->h);
|
|
|
|
av_log(ctx, AV_LOG_DEBUG, "n:%d t:%f text_w:%d text_h:%d x:%d y:%d\n",
|
|
(int)dtext->var_values[VAR_N], dtext->var_values[VAR_T],
|
|
(int)dtext->var_values[VAR_TEXT_W], (int)dtext->var_values[VAR_TEXT_H],
|
|
dtext->x, dtext->y);
|
|
|
|
dtext->var_values[VAR_N] += 1.0;
|
|
|
|
return ff_filter_frame(outlink, frame);
|
|
}
|
|
|
|
static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.get_video_buffer = ff_null_get_video_buffer,
|
|
.filter_frame = filter_frame,
|
|
.config_props = config_input,
|
|
.min_perms = AV_PERM_WRITE |
|
|
AV_PERM_READ,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad avfilter_vf_drawtext_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter avfilter_vf_drawtext = {
|
|
.name = "drawtext",
|
|
.description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
|
|
.priv_size = sizeof(DrawTextContext),
|
|
.init = init,
|
|
.uninit = uninit,
|
|
.query_formats = query_formats,
|
|
|
|
.inputs = avfilter_vf_drawtext_inputs,
|
|
.outputs = avfilter_vf_drawtext_outputs,
|
|
.process_command = command,
|
|
.priv_class = &drawtext_class,
|
|
};
|