mirror of
https://github.com/FFmpeg/FFmpeg.git
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88db6c2890
Signed-off-by: Alex Agranovsky <alex@sighthound.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
1397 lines
47 KiB
C
1397 lines
47 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 "config.h"
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#if HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <time.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <fenv.h>
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#if CONFIG_LIBFONTCONFIG
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#include <fontconfig/fontconfig.h>
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#endif
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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/time_internal.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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#if CONFIG_LIBFRIBIDI
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#include <fribidi.h>
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#endif
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
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#include FT_STROKER_H
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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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"pict_type",
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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_PICT_TYPE,
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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 DrawTextContext {
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const AVClass *class;
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int 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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#if CONFIG_LIBFONTCONFIG
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uint8_t *font; ///< font to be used
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#endif
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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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uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate
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AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec
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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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int borderw; ///< border width
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unsigned int fontsize; ///< font size to use
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short int draw_box; ///< draw box around text - true or false
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int boxborderw; ///< box border width
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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 bordercolor; ///< border 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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FT_Stroker stroker; ///< freetype stroker 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 *a_expr;
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AVExpr *a_pexpr;
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int alpha;
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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 reload; ///< reload text file for each frame
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int start_number; ///< starting frame number for n/frame_num var
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#if CONFIG_LIBFRIBIDI
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int text_shaping; ///< 1 to shape the text before drawing it
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#endif
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AVDictionary *metadata;
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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.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, CHAR_MIN, CHAR_MAX, FLAGS},
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{"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1 , FLAGS},
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{"boxborderw", "set box border width", OFFSET(boxborderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , 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 shadow x offset", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
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{"shadowy", "set shadow y offset", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX , FLAGS},
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{"borderw", "set border width", OFFSET(borderw), 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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#if CONFIG_LIBFONTCONFIG
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{ "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
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#endif
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{"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 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_BOOL, {.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_BOOL, {.i64=0}, 0, 1, FLAGS},
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{ "alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
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{"fix_bounds", "check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},
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{"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
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#if CONFIG_LIBFRIBIDI
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{"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},
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#endif
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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 }, 0, INT_MAX, FLAGS, "ft_load_flags" },
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{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
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{ "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "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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static const 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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} 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 Glyph {
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FT_Glyph glyph;
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FT_Glyph border_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_Bitmap border_bitmap; ///< array holding bitmaps of font border
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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(const 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 *s = ctx->priv;
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FT_BitmapGlyph bitmapglyph;
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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 s->face->glyph */
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if (FT_Load_Char(s->face, code, s->ft_load_flags))
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return AVERROR(EINVAL);
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glyph = av_mallocz(sizeof(*glyph));
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if (!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(s->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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if (s->borderw) {
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glyph->border_glyph = glyph->glyph;
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if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0) ||
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FT_Glyph_To_Bitmap(&glyph->border_glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
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ret = AVERROR_EXTERNAL;
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goto error;
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}
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bitmapglyph = (FT_BitmapGlyph) glyph->border_glyph;
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glyph->border_bitmap = bitmapglyph->bitmap;
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}
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if (FT_Glyph_To_Bitmap(&glyph->glyph, FT_RENDER_MODE_NORMAL, 0, 1)) {
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ret = AVERROR_EXTERNAL;
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goto error;
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}
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bitmapglyph = (FT_BitmapGlyph) glyph->glyph;
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glyph->bitmap = bitmapglyph->bitmap;
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glyph->bitmap_left = bitmapglyph->left;
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glyph->bitmap_top = bitmapglyph->top;
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glyph->advance = s->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(&s->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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{
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DrawTextContext *s = ctx->priv;
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int err;
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err = FT_New_Face(s->library, path, index, &s->face);
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if (err) {
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#if !CONFIG_LIBFONTCONFIG
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av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
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s->fontfile, FT_ERRMSG(err));
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#endif
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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_LIBFONTCONFIG
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static int load_font_fontconfig(AVFilterContext *ctx)
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{
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DrawTextContext *s = ctx->priv;
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FcConfig *fontconfig;
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FcPattern *pat, *best;
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|
FcResult result = FcResultMatch;
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FcChar8 *filename;
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int index;
|
|
double size;
|
|
int err = AVERROR(ENOENT);
|
|
|
|
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);
|
|
if (s->fontsize)
|
|
FcPatternAddDouble(pat, FC_SIZE, (double)s->fontsize);
|
|
|
|
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 (!s->fontsize)
|
|
s->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;
|
|
|
|
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);
|
|
}
|
|
|
|
err = load_font(ctx);
|
|
if (err)
|
|
return err;
|
|
if (!s->fontsize)
|
|
s->fontsize = 16;
|
|
if ((err = FT_Set_Pixel_Sizes(s->face, 0, s->fontsize))) {
|
|
av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
|
|
s->fontsize, FT_ERRMSG(err));
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
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);
|
|
s->x_pexpr = s->y_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);
|
|
s->x_pexpr = s->y_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 *s = ctx->priv;
|
|
|
|
if (!strcmp(cmd, "reinit")) {
|
|
int ret;
|
|
uninit(ctx);
|
|
s->reinit = 1;
|
|
if ((ret = av_set_options_string(ctx, arg, "=", ":")) < 0)
|
|
return ret;
|
|
if ((ret = init(ctx)) < 0)
|
|
return ret;
|
|
return config_input(ctx->inputs[0]);
|
|
}
|
|
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
|
|
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;
|
|
}
|
|
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;
|
|
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);
|
|
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;
|
|
|
|
/* 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(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;
|
|
x = 0;
|
|
continue;
|
|
}
|
|
|
|
/* get glyph */
|
|
prev_glyph = glyph;
|
|
dummy.code = code;
|
|
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);
|
|
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 = FFMIN(width - 1 , max_text_line_w);
|
|
box_h = FFMIN(height - 1, y + s->max_glyph_h);
|
|
|
|
/* 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+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->metadata = av_frame_get_metadata(frame);
|
|
|
|
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,
|
|
};
|