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FFmpeg/libavfilter/vf_drawtext.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Copyright (c) 2023 Francesco Carusi
* Copyright (c) 2011 Stefano Sabatini
* Copyright (c) 2010 S.N. Hemanth Meenakshisundaram
* Copyright (c) 2003 Gustavo Sverzut Barbieri <gsbarbieri@yahoo.com.br>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* drawtext filter, based on the original vhook/drawtext.c
* filter by Gustavo Sverzut Barbieri
*/
#include "config.h"
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fenv.h>
#if CONFIG_LIBFONTCONFIG
#include <fontconfig/fontconfig.h>
#endif
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/common.h"
#include "libavutil/eval.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "libavutil/parseutils.h"
#include "libavutil/time.h"
#include "libavutil/timecode.h"
#include "libavutil/time_internal.h"
#include "libavutil/tree.h"
#include "libavutil/lfg.h"
#include "libavutil/detection_bbox.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "internal.h"
#include "textutils.h"
#include "video.h"
#if CONFIG_LIBFRIBIDI
#include <fribidi.h>
#endif
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include FT_STROKER_H
#include <hb.h>
#include <hb-ft.h>
// Ceiling operation for positive integers division
#define POS_CEIL(x, y) ((x)/(y) + ((x)%(y) != 0))
static const char *const var_names[] = {
"dar",
"hsub", "vsub",
"line_h", "lh", ///< line height
"main_h", "h", "H", ///< height of the input video
"main_w", "w", "W", ///< width of the input video
"max_glyph_a", "ascent", ///< max glyph ascender
"max_glyph_d", "descent", ///< min glyph descender
"max_glyph_h", ///< max glyph height
"max_glyph_w", ///< max glyph width
"font_a", ///< font-defined ascent
"font_d", ///< font-defined descent
"top_a", ///< max glyph ascender of the top line
"bottom_d", ///< max glyph descender of the bottom line
"n", ///< number of frame
"sar",
"t", ///< timestamp expressed in seconds
"text_h", "th", ///< height of the rendered text
"text_w", "tw", ///< width of the rendered text
"x",
"y",
"pict_type",
#if FF_API_FRAME_PKT
"pkt_pos",
#endif
#if FF_API_FRAME_PKT
"pkt_size",
#endif
"duration",
NULL
};
static const char *const fun2_names[] = {
"rand"
};
static double drand(void *opaque, double min, double max)
{
return min + (max-min) / UINT_MAX * av_lfg_get(opaque);
}
typedef double (*eval_func2)(void *, double a, double b);
static const eval_func2 fun2[] = {
drand,
NULL
};
enum var_name {
VAR_DAR,
VAR_HSUB, VAR_VSUB,
VAR_LINE_H, VAR_LH,
VAR_MAIN_H, VAR_h, VAR_H,
VAR_MAIN_W, VAR_w, VAR_W,
VAR_MAX_GLYPH_A, VAR_ASCENT,
VAR_MAX_GLYPH_D, VAR_DESCENT,
VAR_MAX_GLYPH_H,
VAR_MAX_GLYPH_W,
VAR_FONT_A,
VAR_FONT_D,
VAR_TOP_A,
VAR_BOTTOM_D,
VAR_N,
VAR_SAR,
VAR_T,
VAR_TEXT_H, VAR_TH,
VAR_TEXT_W, VAR_TW,
VAR_X,
VAR_Y,
VAR_PICT_TYPE,
#if FF_API_FRAME_PKT
VAR_PKT_POS,
#endif
#if FF_API_FRAME_PKT
VAR_PKT_SIZE,
#endif
VAR_DURATION,
VAR_VARS_NB
};
enum expansion_mode {
EXP_NONE,
EXP_NORMAL,
EXP_STRFTIME,
};
enum y_alignment {
YA_TEXT,
YA_BASELINE,
YA_FONT,
};
enum text_alignment {
TA_LEFT = (1 << 0),
TA_RIGHT = (1 << 1),
TA_TOP = (1 << 2),
TA_BOTTOM = (1 << 3),
};
typedef struct HarfbuzzData {
hb_buffer_t* buf;
hb_font_t* font;
unsigned int glyph_count;
hb_glyph_info_t* glyph_info;
hb_glyph_position_t* glyph_pos;
} HarfbuzzData;
/** Information about a single glyph in a text line */
typedef struct GlyphInfo {
uint32_t code; ///< the glyph code point
int x; ///< the x position of the glyph
int y; ///< the y position of the glyph
int shift_x64; ///< the horizontal shift of the glyph in 26.6 units
int shift_y64; ///< the vertical shift of the glyph in 26.6 units
} GlyphInfo;
/** Information about a single line of text */
typedef struct TextLine {
int offset_left64; ///< offset between the origin and
/// the leftmost pixel of the first glyph
int offset_right64; ///< maximum offset between the origin and
/// the rightmost pixel of the last glyph
int width64; ///< width of the line
HarfbuzzData hb_data; ///< libharfbuzz data of this text line
GlyphInfo* glyphs; ///< array of glyphs in this text line
int cluster_offset; ///< the offset at which this line begins
} TextLine;
/** A glyph as loaded and rendered using libfreetype */
typedef struct Glyph {
FT_Glyph glyph;
FT_Glyph border_glyph;
uint32_t code;
unsigned int fontsize;
/** Glyph bitmaps with 1/4 pixel precision in both directions */
FT_BitmapGlyph bglyph[16];
/** Outlined glyph bitmaps with 1/4 pixel precision in both directions */
FT_BitmapGlyph border_bglyph[16];
FT_BBox bbox;
} Glyph;
/** Global text metrics */
typedef struct TextMetrics {
int offset_top64; ///< ascender amount of the first line (in 26.6 units)
int offset_bottom64; ///< descender amount of the last line (in 26.6 units)
int offset_left64; ///< maximum offset between the origin and
/// the leftmost pixel of the first glyph
/// of each line (in 26.6 units)
int offset_right64; ///< maximum offset between the origin and
/// the rightmost pixel of the last glyph
/// of each line (in 26.6 units)
int line_height64; ///< the font-defined line height
int width; ///< width of the longest line - ceil(width64/64)
int height; ///< total height of the text - ceil(height64/64)
int min_y64; ///< minimum value of bbox.yMin among glyphs (in 26.6 units)
int max_y64; ///< maximum value of bbox.yMax among glyphs (in 26.6 units)
int min_x64; ///< minimum value of bbox.xMin among glyphs (in 26.6 units)
int max_x64; ///< maximum value of bbox.xMax among glyphs (in 26.6 units)
// Position of the background box (without borders)
int rect_x; ///< x position of the box
int rect_y; ///< y position of the box
} TextMetrics;
typedef struct DrawTextContext {
const AVClass *class;
int exp_mode; ///< expansion mode to use for the text
FFExpandTextContext expand_text; ///< expand text in case exp_mode == NORMAL
int reinit; ///< tells if the filter is being reinited
#if CONFIG_LIBFONTCONFIG
uint8_t *font; ///< font to be used
#endif
uint8_t *fontfile; ///< font to be used
uint8_t *text; ///< text to be drawn
AVBPrint expanded_text; ///< used to contain the expanded text
uint8_t *fontcolor_expr; ///< fontcolor expression to evaluate
AVBPrint expanded_fontcolor; ///< used to contain the expanded fontcolor spec
int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
char *textfile; ///< file with text to be drawn
double x; ///< x position to start drawing text
double y; ///< y position to start drawing text
int max_glyph_w; ///< max glyph width
int max_glyph_h; ///< max glyph height
int shadowx, shadowy;
int borderw; ///< border width
char *fontsize_expr; ///< expression for fontsize
AVExpr *fontsize_pexpr; ///< parsed expressions for fontsize
unsigned int fontsize; ///< font size to use
unsigned int default_fontsize; ///< default font size to use
int line_spacing; ///< lines spacing in pixels
short int draw_box; ///< draw box around text - true or false
char *boxborderw; ///< box border width (padding)
/// allowed formats: "all", "vert|oriz", "top|right|bottom|left"
int bb_top; ///< the size of the top box border
int bb_right; ///< the size of the right box border
int bb_bottom; ///< the size of the bottom box border
int bb_left; ///< the size of the left box border
int box_width; ///< the width of box
int box_height; ///< the height of box
int tabsize; ///< tab size
int fix_bounds; ///< do we let it go out of frame bounds - t/f
FFDrawContext dc;
FFDrawColor fontcolor; ///< foreground color
FFDrawColor shadowcolor; ///< shadow color
FFDrawColor bordercolor; ///< border color
FFDrawColor boxcolor; ///< background color
FT_Library library; ///< freetype font library handle
FT_Face face; ///< freetype font face handle
FT_Stroker stroker; ///< freetype stroker handle
struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
char *x_expr; ///< expression for x position
char *y_expr; ///< expression for y position
AVExpr *x_pexpr, *y_pexpr; ///< parsed expressions for x and y
int64_t basetime; ///< base pts time in the real world for display
double var_values[VAR_VARS_NB];
char *a_expr;
AVExpr *a_pexpr;
int alpha;
AVLFG prng; ///< random
char *tc_opt_string; ///< specified timecode option string
AVRational tc_rate; ///< frame rate for timecode
AVTimecode tc; ///< timecode context
int tc24hmax; ///< 1 if timecode is wrapped to 24 hours, 0 otherwise
int reload; ///< reload text file at specified frame interval
int start_number; ///< starting frame number for n/frame_num var
char *text_source_string; ///< the string to specify text data source
enum AVFrameSideDataType text_source;
#if CONFIG_LIBFRIBIDI
int text_shaping; ///< 1 to shape the text before drawing it
#endif
AVDictionary *metadata;
int boxw; ///< the value of the boxw parameter
int boxh; ///< the value of the boxh parameter
int text_align; ///< the horizontal and vertical text alignment
int y_align; ///< the value of the y_align parameter
TextLine *lines; ///< computed information about text lines
int line_count; ///< the number of text lines
uint32_t *tab_clusters; ///< the position of tab characters in the text
int tab_count; ///< the number of tab characters
int blank_advance64; ///< the size of the space character
int tab_warning_printed; ///< ensure the tab warning to be printed only once
} DrawTextContext;
#define OFFSET(x) offsetof(DrawTextContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define TFLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption drawtext_options[]= {
{"fontfile", "set font file", OFFSET(fontfile), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS},
{"text", "set text", OFFSET(text), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, TFLAGS},
{"textfile", "set text file", OFFSET(textfile), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS},
{"fontcolor", "set foreground color", OFFSET(fontcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, TFLAGS},
{"fontcolor_expr", "set foreground color expression", OFFSET(fontcolor_expr), AV_OPT_TYPE_STRING, {.str=""}, 0, 0, FLAGS},
{"boxcolor", "set box color", OFFSET(boxcolor.rgba), AV_OPT_TYPE_COLOR, {.str="white"}, 0, 0, TFLAGS},
{"bordercolor", "set border color", OFFSET(bordercolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, TFLAGS},
{"shadowcolor", "set shadow color", OFFSET(shadowcolor.rgba), AV_OPT_TYPE_COLOR, {.str="black"}, 0, 0, TFLAGS},
{"box", "set box", OFFSET(draw_box), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, TFLAGS},
{"boxborderw", "set box borders width", OFFSET(boxborderw), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, TFLAGS},
{"line_spacing", "set line spacing in pixels", OFFSET(line_spacing), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, TFLAGS},
{"fontsize", "set font size", OFFSET(fontsize_expr), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, TFLAGS},
{"text_align", "set text alignment", OFFSET(text_align), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, (TA_LEFT|TA_RIGHT|TA_TOP|TA_BOTTOM), TFLAGS, .unit = "text_align"},
{ "left", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_LEFT }, .flags = TFLAGS, .unit = "text_align" },
{ "L", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_LEFT }, .flags = TFLAGS, .unit = "text_align" },
{ "right", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_RIGHT }, .flags = TFLAGS, .unit = "text_align" },
{ "R", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_RIGHT }, .flags = TFLAGS, .unit = "text_align" },
{ "center", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = (TA_LEFT|TA_RIGHT) }, .flags = TFLAGS, .unit = "text_align" },
{ "C", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = (TA_LEFT|TA_RIGHT) }, .flags = TFLAGS, .unit = "text_align" },
{ "top", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_TOP }, .flags = TFLAGS, .unit = "text_align" },
{ "T", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_TOP }, .flags = TFLAGS, .unit = "text_align" },
{ "bottom", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_BOTTOM }, .flags = TFLAGS, .unit = "text_align" },
{ "B", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TA_BOTTOM }, .flags = TFLAGS, .unit = "text_align" },
{ "middle", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = (TA_TOP|TA_BOTTOM) }, .flags = TFLAGS, .unit = "text_align" },
{ "M", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = (TA_TOP|TA_BOTTOM) }, .flags = TFLAGS, .unit = "text_align" },
{"x", "set x expression", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, TFLAGS},
{"y", "set y expression", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, TFLAGS},
{"boxw", "set box width", OFFSET(boxw), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, TFLAGS},
{"boxh", "set box height", OFFSET(boxh), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, TFLAGS},
{"shadowx", "set shadow x offset", OFFSET(shadowx), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, TFLAGS},
{"shadowy", "set shadow y offset", OFFSET(shadowy), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, TFLAGS},
{"borderw", "set border width", OFFSET(borderw), AV_OPT_TYPE_INT, {.i64=0}, INT_MIN, INT_MAX, TFLAGS},
{"tabsize", "set tab size", OFFSET(tabsize), AV_OPT_TYPE_INT, {.i64=4}, 0, INT_MAX, TFLAGS},
{"basetime", "set base time", OFFSET(basetime), AV_OPT_TYPE_INT64, {.i64=AV_NOPTS_VALUE}, INT64_MIN, INT64_MAX, FLAGS},
#if CONFIG_LIBFONTCONFIG
{ "font", "Font name", OFFSET(font), AV_OPT_TYPE_STRING, { .str = "Sans" }, .flags = FLAGS },
#endif
{"expansion", "set the expansion mode", OFFSET(exp_mode), AV_OPT_TYPE_INT, {.i64=EXP_NORMAL}, 0, 2, FLAGS, .unit = "expansion"},
{"none", "set no expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NONE}, 0, 0, FLAGS, .unit = "expansion"},
{"normal", "set normal expansion", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_NORMAL}, 0, 0, FLAGS, .unit = "expansion"},
{"strftime", "set strftime expansion (deprecated)", OFFSET(exp_mode), AV_OPT_TYPE_CONST, {.i64=EXP_STRFTIME}, 0, 0, FLAGS, .unit = "expansion"},
{"y_align", "set the y alignment", OFFSET(y_align), AV_OPT_TYPE_INT, {.i64=YA_TEXT}, 0, 2, TFLAGS, .unit = "y_align"},
{"text", "y is referred to the top of the first text line", OFFSET(y_align), AV_OPT_TYPE_CONST, {.i64=YA_TEXT}, 0, 0, FLAGS, .unit = "y_align"},
{"baseline", "y is referred to the baseline of the first line", OFFSET(y_align), AV_OPT_TYPE_CONST, {.i64=YA_BASELINE}, 0, 0, FLAGS, .unit = "y_align"},
{"font", "y is referred to the font defined line metrics", OFFSET(y_align), AV_OPT_TYPE_CONST, {.i64=YA_FONT}, 0, 0, FLAGS, .unit = "y_align"},
{"timecode", "set initial timecode", OFFSET(tc_opt_string), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS},
{"tc24hmax", "set 24 hours max (timecode only)", OFFSET(tc24hmax), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"timecode_rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"r", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"rate", "set rate (timecode only)", OFFSET(tc_rate), AV_OPT_TYPE_RATIONAL, {.dbl=0}, 0, INT_MAX, FLAGS},
{"reload", "reload text file at specified frame interval", OFFSET(reload), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
{"alpha", "apply alpha while rendering", OFFSET(a_expr), AV_OPT_TYPE_STRING, {.str = "1"}, .flags = TFLAGS},
{"fix_bounds", "check and fix text coords to avoid clipping", OFFSET(fix_bounds), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
{"start_number", "start frame number for n/frame_num variable", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS},
{"text_source", "the source of text", OFFSET(text_source_string), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, FLAGS },
#if CONFIG_LIBFRIBIDI
{"text_shaping", "attempt to shape text before drawing", OFFSET(text_shaping), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS},
#endif
/* FT_LOAD_* flags */
{ "ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), AV_OPT_TYPE_FLAGS, { .i64 = FT_LOAD_DEFAULT }, 0, INT_MAX, FLAGS, .unit = "ft_load_flags" },
{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_DEFAULT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_scale", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_SCALE }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_hinting", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_HINTING }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "render", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_RENDER }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "vertical_layout", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_VERTICAL_LAYOUT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "force_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_FORCE_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "crop_bitmap", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_CROP_BITMAP }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "pedantic", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_PEDANTIC }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "ignore_global_advance_width", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_recurse", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_RECURSE }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "ignore_transform", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_IGNORE_TRANSFORM }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "monochrome", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_MONOCHROME }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "linear_design", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_LINEAR_DESIGN }, .flags = FLAGS, .unit = "ft_load_flags" },
{ "no_autohint", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FT_LOAD_NO_AUTOHINT }, .flags = FLAGS, .unit = "ft_load_flags" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(drawtext);
#undef __FTERRORS_H__
#define FT_ERROR_START_LIST {
#define FT_ERRORDEF(e, v, s) { (e), (s) },
#define FT_ERROR_END_LIST { 0, NULL } };
static const struct ft_error {
int err;
const char *err_msg;
} ft_errors[] =
#include FT_ERRORS_H
#define FT_ERRMSG(e) ft_errors[e].err_msg
static int glyph_cmp(const void *key, const void *b)
{
const Glyph *a = key, *bb = b;
int64_t diff = (int64_t)a->code - (int64_t)bb->code;
if (diff != 0)
return diff > 0 ? 1 : -1;
else
return FFDIFFSIGN((int64_t)a->fontsize, (int64_t)bb->fontsize);
}
static av_cold int set_fontsize(AVFilterContext *ctx, unsigned int fontsize)
{
int err;
DrawTextContext *s = ctx->priv;
if ((err = FT_Set_Pixel_Sizes(s->face, 0, fontsize))) {
av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
fontsize, FT_ERRMSG(err));
return AVERROR(EINVAL);
}
s->fontsize = fontsize;
return 0;
}
static av_cold int parse_fontsize(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
int err;
if (s->fontsize_pexpr)
return 0;
if (s->fontsize_expr == NULL)
return AVERROR(EINVAL);
if ((err = av_expr_parse(&s->fontsize_pexpr, s->fontsize_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0)
return err;
return 0;
}
static av_cold int update_fontsize(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
unsigned int fontsize = s->default_fontsize;
int err;
double size, roundedsize;
// if no fontsize specified use the default
if (s->fontsize_expr != NULL) {
if ((err = parse_fontsize(ctx)) < 0)
return err;
size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng);
if (!isnan(size)) {
roundedsize = round(size);
// test for overflow before cast
if (!(roundedsize > INT_MIN && roundedsize < INT_MAX)) {
av_log(ctx, AV_LOG_ERROR, "fontsize overflow\n");
return AVERROR(EINVAL);
}
fontsize = roundedsize;
}
}
if (fontsize == 0)
fontsize = 1;
// no change
if (fontsize == s->fontsize)
return 0;
return set_fontsize(ctx, fontsize);
}
static int load_font_file(AVFilterContext *ctx, const char *path, int index)
{
DrawTextContext *s = ctx->priv;
int err;
err = FT_New_Face(s->library, path, index, &s->face);
if (err) {
#if !CONFIG_LIBFONTCONFIG
av_log(ctx, AV_LOG_ERROR, "Could not load font \"%s\": %s\n",
s->fontfile, FT_ERRMSG(err));
#endif
return AVERROR(EINVAL);
}
return 0;
}
#if CONFIG_LIBFONTCONFIG
static int load_font_fontconfig(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
FcConfig *fontconfig;
FcPattern *pat, *best;
FcResult result = FcResultMatch;
FcChar8 *filename;
int index;
double size;
int err = AVERROR(ENOENT);
int parse_err;
fontconfig = FcInitLoadConfigAndFonts();
if (!fontconfig) {
av_log(ctx, AV_LOG_ERROR, "impossible to init fontconfig\n");
return AVERROR_UNKNOWN;
}
pat = FcNameParse(s->fontfile ? s->fontfile :
(uint8_t *)(intptr_t)"default");
if (!pat) {
av_log(ctx, AV_LOG_ERROR, "could not parse fontconfig pat");
return AVERROR(EINVAL);
}
FcPatternAddString(pat, FC_FAMILY, s->font);
parse_err = parse_fontsize(ctx);
if (!parse_err) {
double size = av_expr_eval(s->fontsize_pexpr, s->var_values, &s->prng);
if (isnan(size)) {
av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
return AVERROR(EINVAL);
}
FcPatternAddDouble(pat, FC_SIZE, size);
}
FcDefaultSubstitute(pat);
if (!FcConfigSubstitute(fontconfig, pat, FcMatchPattern)) {
av_log(ctx, AV_LOG_ERROR, "could not substitue fontconfig options"); /* very unlikely */
FcPatternDestroy(pat);
return AVERROR(ENOMEM);
}
best = FcFontMatch(fontconfig, pat, &result);
FcPatternDestroy(pat);
if (!best || result != FcResultMatch) {
av_log(ctx, AV_LOG_ERROR,
"Cannot find a valid font for the family %s\n",
s->font);
goto fail;
}
if (
FcPatternGetInteger(best, FC_INDEX, 0, &index ) != FcResultMatch ||
FcPatternGetDouble (best, FC_SIZE, 0, &size ) != FcResultMatch) {
av_log(ctx, AV_LOG_ERROR, "impossible to find font information");
return AVERROR(EINVAL);
}
if (FcPatternGetString(best, FC_FILE, 0, &filename) != FcResultMatch) {
av_log(ctx, AV_LOG_ERROR, "No file path for %s\n",
s->font);
goto fail;
}
av_log(ctx, AV_LOG_VERBOSE, "Using \"%s\"\n", filename);
if (parse_err)
s->default_fontsize = size + 0.5;
err = load_font_file(ctx, filename, index);
if (err)
return err;
FcConfigDestroy(fontconfig);
fail:
FcPatternDestroy(best);
return err;
}
#endif
static int load_font(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
int err;
/* load the face, and set up the encoding, which is by default UTF-8 */
err = load_font_file(ctx, s->fontfile, 0);
if (!err)
return 0;
#if CONFIG_LIBFONTCONFIG
err = load_font_fontconfig(ctx);
if (!err)
return 0;
#endif
return err;
}
#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 (ff_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 enum AVFrameSideDataType text_source_string_parse(const char *text_source_string)
{
av_assert0(text_source_string);
if (!strcmp(text_source_string, "side_data_detection_bboxes")) {
return AV_FRAME_DATA_DETECTION_BBOXES;
} else {
return AVERROR(EINVAL);
}
}
static inline int get_subpixel_idx(int shift_x64, int shift_y64)
{
int idx = (shift_x64 >> 2) + (shift_y64 >> 4);
return idx;
}
// Loads and (optionally) renders a glyph
static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code, int8_t shift_x64, int8_t shift_y64)
{
DrawTextContext *s = ctx->priv;
Glyph dummy = { 0 };
Glyph *glyph;
FT_Vector shift;
struct AVTreeNode *node = NULL;
int ret = 0;
/* get glyph */
dummy.code = code;
dummy.fontsize = s->fontsize;
glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
if (!glyph) {
if (FT_Load_Glyph(s->face, code, s->ft_load_flags)) {
return AVERROR(EINVAL);
}
glyph = av_mallocz(sizeof(*glyph));
if (!glyph) {
ret = AVERROR(ENOMEM);
goto error;
}
glyph->code = code;
glyph->fontsize = s->fontsize;
if (FT_Get_Glyph(s->face->glyph, &glyph->glyph)) {
ret = AVERROR(EINVAL);
goto error;
}
if (s->borderw) {
glyph->border_glyph = glyph->glyph;
if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0)) {
ret = AVERROR_EXTERNAL;
goto error;
}
}
/* measure text height to calculate text_height (or the maximum text height) */
FT_Glyph_Get_CBox(glyph->glyph, FT_GLYPH_BBOX_SUBPIXELS, &glyph->bbox);
/* cache the newly created glyph */
if (!(node = av_tree_node_alloc())) {
ret = AVERROR(ENOMEM);
goto error;
}
av_tree_insert(&s->glyphs, glyph, glyph_cmp, &node);
} else {
if (s->borderw && !glyph->border_glyph) {
glyph->border_glyph = glyph->glyph;
if (FT_Glyph_StrokeBorder(&glyph->border_glyph, s->stroker, 0, 0)) {
ret = AVERROR_EXTERNAL;
goto error;
}
}
}
// Check if a bitmap is needed
if (shift_x64 >= 0 && shift_y64 >= 0) {
// Get the bitmap subpixel index (0 -> 15)
int idx = get_subpixel_idx(shift_x64, shift_y64);
shift.x = shift_x64;
shift.y = shift_y64;
if (!glyph->bglyph[idx]) {
FT_Glyph tmp_glyph = glyph->glyph;
if (FT_Glyph_To_Bitmap(&tmp_glyph, FT_RENDER_MODE_NORMAL, &shift, 0)) {
ret = AVERROR_EXTERNAL;
goto error;
}
glyph->bglyph[idx] = (FT_BitmapGlyph)tmp_glyph;
if (glyph->bglyph[idx]->bitmap.pixel_mode == FT_PIXEL_MODE_MONO) {
av_log(ctx, AV_LOG_ERROR, "Monocromatic (1bpp) fonts are not supported.\n");
ret = AVERROR(EINVAL);
goto error;
}
}
if (s->borderw && !glyph->border_bglyph[idx]) {
FT_Glyph tmp_glyph = glyph->border_glyph;
if (FT_Glyph_To_Bitmap(&tmp_glyph, FT_RENDER_MODE_NORMAL, &shift, 0)) {
ret = AVERROR_EXTERNAL;
goto error;
}
glyph->border_bglyph[idx] = (FT_BitmapGlyph)tmp_glyph;
}
}
if (glyph_ptr) {
*glyph_ptr = glyph;
}
return 0;
error:
if (glyph && glyph->glyph)
FT_Done_Glyph(glyph->glyph);
av_freep(&glyph);
av_freep(&node);
return ret;
}
// Convert a string formatted as "n1|n2|...|nN" into an integer array
static int string_to_array(const char *source, int *result, int result_size)
{
int counter = 0, size = strlen(source) + 1;
char *saveptr, *curval, *dup = av_malloc(size);
if (!dup)
return 0;
av_strlcpy(dup, source, size);
if (result_size > 0 && (curval = av_strtok(dup, "|", &saveptr))) {
do {
result[counter++] = atoi(curval);
} while ((curval = av_strtok(NULL, "|", &saveptr)) && counter < result_size);
}
av_free(dup);
return counter;
}
static int func_pict_type(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
av_bprintf(bp, "%c", av_get_picture_type_char(s->var_values[VAR_PICT_TYPE]));
return 0;
}
static int func_pts(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
const char *fmt;
const char *strftime_fmt = NULL;
const char *delta = NULL;
double pts = s->var_values[VAR_T];
// argv: pts, FMT, [DELTA, 24HH | strftime_fmt]
fmt = argc >= 1 ? argv[0] : "flt";
if (argc >= 2) {
delta = argv[1];
}
if (argc >= 3) {
if (!strcmp(fmt, "hms")) {
if (!strcmp(argv[2], "24HH")) {
av_log(ctx, AV_LOG_WARNING, "pts third argument 24HH is deprected, use pts:hms24hh instead\n");
fmt = "hms24";
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s', '24HH' was expected\n", argv[2]);
return AVERROR(EINVAL);
}
} else {
strftime_fmt = argv[2];
}
}
return ff_print_pts(ctx, bp, pts, delta, fmt, strftime_fmt);
}
static int func_frame_num(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);
return 0;
}
static int func_metadata(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)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(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
const char *strftime_fmt = argc ? argv[0] : NULL;
return ff_print_time(ctx, bp, strftime_fmt, !strcmp(function_name, "localtime"));
}
static int func_eval_expr(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
return ff_print_eval_expr(ctx, bp, argv[0],
fun2_names, fun2,
var_names, s->var_values, &s->prng);
}
static int func_eval_expr_int_format(void *ctx, AVBPrint *bp, const char *function_name, unsigned argc, char **argv)
{
DrawTextContext *s = ((AVFilterContext *)ctx)->priv;
int ret;
int positions = -1;
/*
* argv[0] expression to be converted to `int`
* argv[1] format: 'x', 'X', 'd' or 'u'
* argv[2] positions printed (optional)
*/
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);
}
}
return ff_print_formatted_eval_expr(ctx, bp, argv[0],
fun2_names, fun2,
var_names, s->var_values,
&s->prng,
argv[1][0], positions);
}
static FFExpandTextFunction expand_text_functions[] = {
{ "e", 1, 1, func_eval_expr },
{ "eif", 2, 3, func_eval_expr_int_format },
{ "expr", 1, 1, func_eval_expr },
{ "expr_int_format", 2, 3, func_eval_expr_int_format },
{ "frame_num", 0, 0, func_frame_num },
{ "gmtime", 0, 1, func_strftime },
{ "localtime", 0, 1, func_strftime },
{ "metadata", 1, 2, func_metadata },
{ "n", 0, 0, func_frame_num },
{ "pict_type", 0, 0, func_pict_type },
{ "pts", 0, 3, func_pts }
};
static av_cold int init(AVFilterContext *ctx)
{
int err;
DrawTextContext *s = ctx->priv;
av_expr_free(s->fontsize_pexpr);
s->fontsize_pexpr = NULL;
s->fontsize = 0;
s->default_fontsize = 16;
if (!s->fontfile && !CONFIG_LIBFONTCONFIG) {
av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
return AVERROR(EINVAL);
}
if (s->textfile) {
if (s->text) {
av_log(ctx, AV_LOG_ERROR,
"Both text and text file provided. Please provide only one\n");
return AVERROR(EINVAL);
}
if ((err = ff_load_textfile(ctx, (const char *)s->textfile, &s->text, NULL)) < 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_source_string) {
s->text_source = text_source_string_parse(s->text_source_string);
if ((int)s->text_source < 0) {
av_log(ctx, AV_LOG_ERROR, "Error text source: %s\n", s->text_source_string);
return AVERROR(EINVAL);
}
}
if (s->text_source == AV_FRAME_DATA_DETECTION_BBOXES) {
if (s->text) {
av_log(ctx, AV_LOG_WARNING, "Multiple texts provided, will use text_source only\n");
av_free(s->text);
}
s->text = av_mallocz(AV_DETECTION_BBOX_LABEL_NAME_MAX_SIZE *
(AV_NUM_DETECTION_BBOX_CLASSIFY + 1));
if (!s->text)
return AVERROR(ENOMEM);
}
if (!s->text) {
av_log(ctx, AV_LOG_ERROR,
"Either text, a valid file, a timecode or text source must be provided\n");
return AVERROR(EINVAL);
}
s->expand_text = (FFExpandTextContext) {
.log_ctx = ctx,
.functions = expand_text_functions,
.functions_nb = FF_ARRAY_ELEMS(expand_text_functions)
};
#if CONFIG_LIBFRIBIDI
if (s->text_shaping)
if ((err = shape_text(ctx)) < 0)
return err;
#endif
if ((err = FT_Init_FreeType(&(s->library)))) {
av_log(ctx, AV_LOG_ERROR,
"Could not load FreeType: %s\n", FT_ERRMSG(err));
return AVERROR(EINVAL);
}
if ((err = load_font(ctx)) < 0)
return err;
if ((err = update_fontsize(ctx)) < 0)
return err;
// Always init the stroker, may be needed if borderw is set via command
if (FT_Stroker_New(s->library, &s->stroker)) {
av_log(ctx, AV_LOG_ERROR, "Could not init FT stroker\n");
return AVERROR_EXTERNAL;
}
if (s->borderw) {
FT_Stroker_Set(s->stroker, s->borderw << 6, FT_STROKER_LINECAP_ROUND,
FT_STROKER_LINEJOIN_ROUND, 0);
}
/* load the fallback glyph with code 0 */
load_glyph(ctx, NULL, 0, 0, 0);
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_border_free(void *opaque, void *elem)
{
Glyph *glyph = elem;
if (glyph->border_glyph != NULL) {
for (int t = 0; t < 16; ++t) {
if (glyph->border_bglyph[t] != NULL) {
FT_Done_Glyph((FT_Glyph)glyph->border_bglyph[t]);
glyph->border_bglyph[t] = NULL;
}
}
FT_Done_Glyph(glyph->border_glyph);
glyph->border_glyph = NULL;
}
return 0;
}
static int glyph_enu_free(void *opaque, void *elem)
{
Glyph *glyph = elem;
FT_Done_Glyph(glyph->glyph);
FT_Done_Glyph(glyph->border_glyph);
for (int t = 0; t < 16; ++t) {
if (glyph->bglyph[t] != NULL) {
FT_Done_Glyph((FT_Glyph)glyph->bglyph[t]);
}
if (glyph->border_bglyph[t] != NULL) {
FT_Done_Glyph((FT_Glyph)glyph->border_bglyph[t]);
}
}
av_free(elem);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
DrawTextContext *s = ctx->priv;
av_expr_free(s->x_pexpr);
av_expr_free(s->y_pexpr);
av_expr_free(s->a_pexpr);
av_expr_free(s->fontsize_pexpr);
s->x_pexpr = s->y_pexpr = s->a_pexpr = s->fontsize_pexpr = NULL;
av_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;
char *expr;
int ret;
ff_draw_init2(&s->dc, inlink->format, inlink->colorspace, inlink->color_range, FF_DRAW_PROCESS_ALPHA);
ff_draw_color(&s->dc, &s->fontcolor, s->fontcolor.rgba);
ff_draw_color(&s->dc, &s->shadowcolor, s->shadowcolor.rgba);
ff_draw_color(&s->dc, &s->bordercolor, s->bordercolor.rgba);
ff_draw_color(&s->dc, &s->boxcolor, s->boxcolor.rgba);
s->var_values[VAR_w] = s->var_values[VAR_W] = s->var_values[VAR_MAIN_W] = inlink->w;
s->var_values[VAR_h] = s->var_values[VAR_H] = s->var_values[VAR_MAIN_H] = inlink->h;
s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? av_q2d(inlink->sample_aspect_ratio) : 1;
s->var_values[VAR_DAR] = (double)inlink->w / inlink->h * s->var_values[VAR_SAR];
s->var_values[VAR_HSUB] = 1 << s->dc.hsub_max;
s->var_values[VAR_VSUB] = 1 << s->dc.vsub_max;
s->var_values[VAR_X] = NAN;
s->var_values[VAR_Y] = NAN;
s->var_values[VAR_T] = NAN;
av_lfg_init(&s->prng, av_get_random_seed());
av_expr_free(s->x_pexpr);
av_expr_free(s->y_pexpr);
av_expr_free(s->a_pexpr);
s->x_pexpr = s->y_pexpr = s->a_pexpr = NULL;
if ((ret = av_expr_parse(&s->x_pexpr, expr = s->x_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
(ret = av_expr_parse(&s->y_pexpr, expr = s->y_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0 ||
(ret = av_expr_parse(&s->a_pexpr, expr = s->a_expr, var_names,
NULL, NULL, fun2_names, fun2, 0, ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Failed to parse expression: %s \n", expr);
return AVERROR(EINVAL);
}
return 0;
}
static int command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
{
DrawTextContext *old = ctx->priv;
DrawTextContext *new = NULL;
int ret;
if (!strcmp(cmd, "reinit")) {
new = av_mallocz(sizeof(DrawTextContext));
if (!new)
return AVERROR(ENOMEM);
new->class = &drawtext_class;
ret = av_opt_copy(new, old);
if (ret < 0)
goto fail;
ctx->priv = new;
ret = av_set_options_string(ctx, arg, "=", ":");
if (ret < 0) {
ctx->priv = old;
goto fail;
}
ret = init(ctx);
if (ret < 0) {
uninit(ctx);
ctx->priv = old;
goto fail;
}
new->reinit = 1;
ctx->priv = old;
uninit(ctx);
av_freep(&old);
ctx->priv = new;
return config_input(ctx->inputs[0]);
} else {
int old_borderw = old->borderw;
if ((ret = ff_filter_process_command(ctx, cmd, arg, res, res_len, flags)) < 0) {
return ret;
}
if (old->borderw != old_borderw) {
FT_Stroker_Set(old->stroker, old->borderw << 6, FT_STROKER_LINECAP_ROUND,
FT_STROKER_LINEJOIN_ROUND, 0);
// Dispose the old border glyphs
av_tree_enumerate(old->glyphs, NULL, NULL, glyph_enu_border_free);
} else if (strcmp(cmd, "fontsize") == 0) {
av_expr_free(old->fontsize_pexpr);
old->fontsize_pexpr = NULL;
old->blank_advance64 = 0;
}
return config_input(ctx->inputs[0]);
}
fail:
av_log(ctx, AV_LOG_ERROR, "Failed to process command. Continuing with existing parameters.\n");
av_freep(&new);
return ret;
}
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_glyphs(DrawTextContext *s, AVFrame *frame,
FFDrawColor *color,
TextMetrics *metrics,
int x, int y, int borderw)
{
int g, l, x1, y1, w1, h1, idx;
int dx = 0, dy = 0, pdx = 0;
GlyphInfo *info;
Glyph dummy = { 0 }, *glyph;
FT_Bitmap bitmap;
FT_BitmapGlyph b_glyph;
uint8_t j_left = 0, j_right = 0, j_top = 0, j_bottom = 0;
int line_w, offset_y = 0;
int clip_x = 0, clip_y = 0;
j_left = !!(s->text_align & TA_LEFT);
j_right = !!(s->text_align & TA_RIGHT);
j_top = !!(s->text_align & TA_TOP);
j_bottom = !!(s->text_align & TA_BOTTOM);
if (j_top && j_bottom) {
offset_y = (s->box_height - metrics->height) / 2;
} else if (j_bottom) {
offset_y = s->box_height - metrics->height;
}
if ((!j_left || j_right) && !s->tab_warning_printed && s->tab_count > 0) {
s->tab_warning_printed = 1;
av_log(s, AV_LOG_WARNING, "Tab characters are only supported with left horizontal alignment\n");
}
clip_x = FFMIN(metrics->rect_x + s->box_width + s->bb_right, frame->width);
clip_y = FFMIN(metrics->rect_y + s->box_height + s->bb_bottom, frame->height);
for (l = 0; l < s->line_count; ++l) {
TextLine *line = &s->lines[l];
line_w = POS_CEIL(line->width64, 64);
for (g = 0; g < line->hb_data.glyph_count; ++g) {
info = &line->glyphs[g];
dummy.fontsize = s->fontsize;
dummy.code = info->code;
glyph = av_tree_find(s->glyphs, &dummy, glyph_cmp, NULL);
if (!glyph) {
return AVERROR(EINVAL);
}
idx = get_subpixel_idx(info->shift_x64, info->shift_y64);
b_glyph = borderw ? glyph->border_bglyph[idx] : glyph->bglyph[idx];
bitmap = b_glyph->bitmap;
x1 = x + info->x + b_glyph->left;
y1 = y + info->y - b_glyph->top + offset_y;
w1 = bitmap.width;
h1 = bitmap.rows;
if (j_left && j_right) {
x1 += (s->box_width - line_w) / 2;
} else if (j_right) {
x1 += s->box_width - line_w;
}
// Offset of the glyph's bitmap in the visible region
dx = dy = 0;
if (x1 < metrics->rect_x - s->bb_left) {
dx = metrics->rect_x - s->bb_left - x1;
x1 = metrics->rect_x - s->bb_left;
}
if (y1 < metrics->rect_y - s->bb_top) {
dy = metrics->rect_y - s->bb_top - y1;
y1 = metrics->rect_y - s->bb_top;
}
// check if the glyph is empty or out of the clipping region
if (dx >= w1 || dy >= h1 || x1 >= clip_x || y1 >= clip_y) {
continue;
}
pdx = dx + dy * bitmap.pitch;
w1 = FFMIN(clip_x - x1, w1 - dx);
h1 = FFMIN(clip_y - y1, h1 - dy);
ff_blend_mask(&s->dc, color, frame->data, frame->linesize, clip_x, clip_y,
bitmap.buffer + pdx, bitmap.pitch, w1, h1, 3, 0, x1, y1);
}
}
return 0;
}
// Shapes a line of text using libharfbuzz
static int shape_text_hb(DrawTextContext *s, HarfbuzzData* hb, const char* text, int textLen)
{
hb->buf = hb_buffer_create();
if(!hb_buffer_allocation_successful(hb->buf)) {
return AVERROR(ENOMEM);
}
hb_buffer_set_direction(hb->buf, HB_DIRECTION_LTR);
hb_buffer_set_script(hb->buf, HB_SCRIPT_LATIN);
hb_buffer_set_language(hb->buf, hb_language_from_string("en", -1));
hb_buffer_guess_segment_properties(hb->buf);
hb->font = hb_ft_font_create(s->face, NULL);
if(hb->font == NULL) {
return AVERROR(ENOMEM);
}
hb_ft_font_set_funcs(hb->font);
hb_buffer_add_utf8(hb->buf, text, textLen, 0, -1);
hb_shape(hb->font, hb->buf, NULL, 0);
hb->glyph_info = hb_buffer_get_glyph_infos(hb->buf, &hb->glyph_count);
hb->glyph_pos = hb_buffer_get_glyph_positions(hb->buf, &hb->glyph_count);
return 0;
}
static void hb_destroy(HarfbuzzData *hb)
{
hb_buffer_destroy(hb->buf);
hb_font_destroy(hb->font);
hb->buf = NULL;
hb->font = NULL;
hb->glyph_info = NULL;
hb->glyph_pos = NULL;
}
static int measure_text(AVFilterContext *ctx, TextMetrics *metrics)
{
DrawTextContext *s = ctx->priv;
char *text = s->expanded_text.str;
char *textdup = NULL, *start = NULL;
int num_chars = 0;
int width64 = 0, w64 = 0;
int cur_min_y64 = 0, first_max_y64 = -32000;
int first_min_x64 = 32000, last_max_x64 = -32000;
int min_y64 = 32000, max_y64 = -32000, min_x64 = 32000, max_x64 = -32000;
int line_count = 0;
uint32_t code = 0;
Glyph *glyph = NULL;
int i, tab_idx = 0, last_tab_idx = 0, line_offset = 0;
char* p;
int ret = 0;
// Count the lines and the tab characters
s->tab_count = 0;
for (i = 0, p = text; 1; i++) {
GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_failed;);
continue_on_failed:
if (ff_is_newline(code) || code == 0) {
++line_count;
if (code == 0) {
break;
}
} else if (code == '\t') {
++s->tab_count;
}
}
// Evaluate the width of the space character if needed to replace tabs
if (s->tab_count > 0 && !s->blank_advance64) {
HarfbuzzData hb_data;
ret = shape_text_hb(s, &hb_data, " ", 1);
if(ret != 0) {
goto done;
}
s->blank_advance64 = hb_data.glyph_pos[0].x_advance;
hb_destroy(&hb_data);
}
s->line_count = line_count;
s->lines = av_mallocz(line_count * sizeof(TextLine));
s->tab_clusters = av_mallocz(s->tab_count * sizeof(uint32_t));
for (i = 0; i < s->tab_count; ++i) {
s->tab_clusters[i] = -1;
}
start = textdup = av_strdup(text);
if (textdup == NULL) {
ret = AVERROR(ENOMEM);
goto done;
}
line_count = 0;
for (i = 0, p = textdup; 1; i++) {
if (*p == '\t') {
s->tab_clusters[tab_idx++] = i;
*p = ' ';
}
GET_UTF8(code, *p ? *p++ : 0, code = 0xfffd; goto continue_on_failed2;);
continue_on_failed2:
if (ff_is_newline(code) || code == 0) {
TextLine *cur_line = &s->lines[line_count];
HarfbuzzData *hb = &cur_line->hb_data;
cur_line->cluster_offset = line_offset;
ret = shape_text_hb(s, hb, start, num_chars);
if (ret != 0) {
goto done;
}
w64 = 0;
cur_min_y64 = 32000;
for (int t = 0; t < hb->glyph_count; ++t) {
uint8_t is_tab = last_tab_idx < s->tab_count &&
hb->glyph_info[t].cluster == s->tab_clusters[last_tab_idx] - line_offset;
if (is_tab) {
++last_tab_idx;
}
ret = load_glyph(ctx, &glyph, hb->glyph_info[t].codepoint, -1, -1);
if (ret != 0) {
goto done;
}
if (line_count == 0) {
first_max_y64 = FFMAX(glyph->bbox.yMax, first_max_y64);
}
if (t == 0) {
cur_line->offset_left64 = glyph->bbox.xMin;
first_min_x64 = FFMIN(glyph->bbox.xMin, first_min_x64);
}
if (t == hb->glyph_count - 1) {
// The following code measures the width of the line up to the last
// character's horizontal advance
int last_char_width = hb->glyph_pos[t].x_advance;
// The following code measures the width of the line up to the rightmost
// visible pixel of the last character
// int last_char_width = glyph->bbox.xMax;
w64 += last_char_width;
last_max_x64 = FFMAX(last_char_width, last_max_x64);
cur_line->offset_right64 = last_char_width;
} else {
if (is_tab) {
int size = s->blank_advance64 * s->tabsize;
w64 = (w64 / size + 1) * size;
} else {
w64 += hb->glyph_pos[t].x_advance;
}
}
cur_min_y64 = FFMIN(glyph->bbox.yMin, cur_min_y64);
min_y64 = FFMIN(glyph->bbox.yMin, min_y64);
max_y64 = FFMAX(glyph->bbox.yMax, max_y64);
min_x64 = FFMIN(glyph->bbox.xMin, min_x64);
max_x64 = FFMAX(glyph->bbox.xMax, max_x64);
}
cur_line->width64 = w64;
av_log(s, AV_LOG_DEBUG, " Line: %d -- glyphs count: %d - width64: %d - offset_left64: %d - offset_right64: %d)\n",
line_count, hb->glyph_count, cur_line->width64, cur_line->offset_left64, cur_line->offset_right64);
if (w64 > width64) {
width64 = w64;
}
num_chars = -1;
start = p;
++line_count;
line_offset = i + 1;
}
if (code == 0) break;
++num_chars;
}
metrics->line_height64 = s->face->size->metrics.height;
metrics->width = POS_CEIL(width64, 64);
if (s->y_align == YA_FONT) {
metrics->height = POS_CEIL(metrics->line_height64 * line_count, 64);
} else {
int height64 = (metrics->line_height64 + s->line_spacing * 64) *
(FFMAX(0, line_count - 1)) + first_max_y64 - cur_min_y64;
metrics->height = POS_CEIL(height64, 64);
}
metrics->offset_top64 = first_max_y64;
metrics->offset_right64 = last_max_x64;
metrics->offset_bottom64 = cur_min_y64;
metrics->offset_left64 = first_min_x64;
metrics->min_x64 = min_x64;
metrics->min_y64 = min_y64;
metrics->max_x64 = max_x64;
metrics->max_y64 = max_y64;
done:
av_free(textdup);
return ret;
}
static int draw_text(AVFilterContext *ctx, AVFrame *frame)
{
DrawTextContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
int x = 0, y = 0, ret;
int shift_x64, shift_y64;
int x64, y64;
Glyph *glyph = NULL;
time_t now = time(0);
struct tm ltime;
AVBPrint *bp = &s->expanded_text;
FFDrawColor fontcolor;
FFDrawColor shadowcolor;
FFDrawColor bordercolor;
FFDrawColor boxcolor;
int width = frame->width;
int height = frame->height;
int rec_x = 0, rec_y = 0, rec_width = 0, rec_height = 0;
int is_outside = 0;
int last_tab_idx = 0;
TextMetrics metrics;
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 = ff_expand_text(&s->expand_text, s->text, &s->expanded_text)) < 0)
return ret;
break;
case EXP_STRFTIME:
localtime_r(&now, &ltime);
av_bprint_strftime(bp, s->text, &ltime);
break;
}
if (s->tc_opt_string) {
char tcbuf[AV_TIMECODE_STR_SIZE];
av_timecode_make_string(&s->tc, tcbuf, inlink->frame_count_out);
av_bprint_clear(bp);
av_bprintf(bp, "%s%s", s->text, tcbuf);
}
if (!av_bprint_is_complete(bp))
return AVERROR(ENOMEM);
if (s->fontcolor_expr[0]) {
/* If expression is set, evaluate and replace the static value */
av_bprint_clear(&s->expanded_fontcolor);
if ((ret = ff_expand_text(&s->expand_text, 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);
}
if ((ret = update_fontsize(ctx)) < 0) {
return ret;
}
if ((ret = measure_text(ctx, &metrics)) < 0) {
return ret;
}
s->max_glyph_h = POS_CEIL(metrics.max_y64 - metrics.min_y64, 64);
s->max_glyph_w = POS_CEIL(metrics.max_x64 - metrics.min_x64, 64);
s->var_values[VAR_TW] = s->var_values[VAR_TEXT_W] = metrics.width;
s->var_values[VAR_TH] = s->var_values[VAR_TEXT_H] = metrics.height;
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] = POS_CEIL(metrics.max_y64, 64);
s->var_values[VAR_FONT_A] = s->face->size->metrics.ascender / 64;
s->var_values[VAR_MAX_GLYPH_D] = s->var_values[VAR_DESCENT] = POS_CEIL(metrics.min_y64, 64);
s->var_values[VAR_FONT_D] = -s->face->size->metrics.descender / 64;
s->var_values[VAR_TOP_A] = POS_CEIL(metrics.offset_top64, 64);
s->var_values[VAR_BOTTOM_D] = -POS_CEIL(metrics.offset_bottom64, 64);
s->var_values[VAR_LINE_H] = s->var_values[VAR_LH] = metrics.line_height64 / 64.;
if (s->text_source == AV_FRAME_DATA_DETECTION_BBOXES) {
s->var_values[VAR_X] = s->x;
s->var_values[VAR_Y] = s->y;
} else {
s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
s->y = s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, &s->prng);
/* It is necessary if x is expressed from y */
s->x = s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, &s->prng);
}
update_alpha(s);
update_color_with_alpha(s, &fontcolor , s->fontcolor );
update_color_with_alpha(s, &shadowcolor, s->shadowcolor);
update_color_with_alpha(s, &bordercolor, s->bordercolor);
update_color_with_alpha(s, &boxcolor , s->boxcolor );
if (s->draw_box && s->boxborderw) {
int bbsize[4];
int count;
count = string_to_array(s->boxborderw, bbsize, 4);
if (count == 1) {
s->bb_top = s->bb_right = s->bb_bottom = s->bb_left = bbsize[0];
} else if (count == 2) {
s->bb_top = s->bb_bottom = bbsize[0];
s->bb_right = s->bb_left = bbsize[1];
} else if (count == 3) {
s->bb_top = bbsize[0];
s->bb_right = s->bb_left = bbsize[1];
s->bb_bottom = bbsize[2];
} else if (count == 4) {
s->bb_top = bbsize[0];
s->bb_right = bbsize[1];
s->bb_bottom = bbsize[2];
s->bb_left = bbsize[3];
}
} else {
s->bb_top = s->bb_right = s->bb_bottom = s->bb_left = 0;
}
if (s->fix_bounds) {
/* calculate footprint of text effects */
int borderoffset = s->borderw ? FFMAX(s->borderw, 0) : 0;
int offsetleft = FFMAX3(FFMAX(s->bb_left, 0), borderoffset,
(s->shadowx < 0 ? FFABS(s->shadowx) : 0));
int offsettop = FFMAX3(FFMAX(s->bb_top, 0), borderoffset,
(s->shadowy < 0 ? FFABS(s->shadowy) : 0));
int offsetright = FFMAX3(FFMAX(s->bb_right, 0), borderoffset,
(s->shadowx > 0 ? s->shadowx : 0));
int offsetbottom = FFMAX3(FFMAX(s->bb_bottom, 0), borderoffset,
(s->shadowy > 0 ? s->shadowy : 0));
if (s->x - offsetleft < 0) s->x = offsetleft;
if (s->y - offsettop < 0) s->y = offsettop;
if (s->x + metrics.width + offsetright > width)
s->x = FFMAX(width - metrics.width - offsetright, 0);
if (s->y + metrics.height + offsetbottom > height)
s->y = FFMAX(height - metrics.height - offsetbottom, 0);
}
x = 0;
y = 0;
x64 = (int)(s->x * 64.);
if (s->y_align == YA_FONT) {
y64 = (int)(s->y * 64. + s->face->size->metrics.ascender);
} else if (s->y_align == YA_BASELINE) {
y64 = (int)(s->y * 64.);
} else {
y64 = (int)(s->y * 64. + metrics.offset_top64);
}
for (int l = 0; l < s->line_count; ++l) {
TextLine *line = &s->lines[l];
HarfbuzzData *hb = &line->hb_data;
line->glyphs = av_mallocz(hb->glyph_count * sizeof(GlyphInfo));
for (int t = 0; t < hb->glyph_count; ++t) {
GlyphInfo *g_info = &line->glyphs[t];
uint8_t is_tab = last_tab_idx < s->tab_count &&
hb->glyph_info[t].cluster == s->tab_clusters[last_tab_idx] - line->cluster_offset;
int true_x, true_y;
if (is_tab) {
++last_tab_idx;
}
true_x = x + hb->glyph_pos[t].x_offset;
true_y = y + hb->glyph_pos[t].y_offset;
shift_x64 = (((x64 + true_x) >> 4) & 0b0011) << 4;
shift_y64 = ((4 - (((y64 + true_y) >> 4) & 0b0011)) & 0b0011) << 4;
ret = load_glyph(ctx, &glyph, hb->glyph_info[t].codepoint, shift_x64, shift_y64);
if (ret != 0) {
return ret;
}
g_info->code = hb->glyph_info[t].codepoint;
g_info->x = (x64 + true_x) >> 6;
g_info->y = ((y64 + true_y) >> 6) + (shift_y64 > 0 ? 1 : 0);
g_info->shift_x64 = shift_x64;
g_info->shift_y64 = shift_y64;
if (!is_tab) {
x += hb->glyph_pos[t].x_advance;
} else {
int size = s->blank_advance64 * s->tabsize;
x = (x / size + 1) * size;
}
y += hb->glyph_pos[t].y_advance;
}
y += metrics.line_height64 + s->line_spacing * 64;
x = 0;
}
metrics.rect_x = s->x;
if (s->y_align == YA_BASELINE) {
metrics.rect_y = s->y - metrics.offset_top64 / 64;
} else {
metrics.rect_y = s->y;
}
s->box_width = s->boxw == 0 ? metrics.width : s->boxw;
s->box_height = s->boxh == 0 ? metrics.height : s->boxh;
if (!s->draw_box) {
// Create a border for the clipping region to take into account subpixel
// errors in text measurement and effects.
int borderoffset = s->borderw ? FFMAX(s->borderw, 0) : 0;
s->bb_left = borderoffset + (s->shadowx < 0 ? FFABS(s->shadowx) : 0) + 1;
s->bb_top = borderoffset + (s->shadowy < 0 ? FFABS(s->shadowy) : 0) + 1;
s->bb_right = borderoffset + (s->shadowx > 0 ? s->shadowx : 0) + 1;
s->bb_bottom = borderoffset + (s->shadowy > 0 ? s->shadowy : 0) + 1;
}
/* Check if the whole box is out of the frame */
is_outside = metrics.rect_x - s->bb_left >= width ||
metrics.rect_y - s->bb_top >= height ||
metrics.rect_x + s->box_width + s->bb_right <= 0 ||
metrics.rect_y + s->box_height + s->bb_bottom <= 0;
if (!is_outside) {
/* draw box */
if (s->draw_box) {
rec_x = metrics.rect_x - s->bb_left;
rec_y = metrics.rect_y - s->bb_top;
rec_width = s->box_width + s->bb_right + s->bb_left;
rec_height = s->box_height + s->bb_bottom + s->bb_top;
ff_blend_rectangle(&s->dc, &boxcolor,
frame->data, frame->linesize, width, height,
rec_x, rec_y, rec_width, rec_height);
}
if (s->shadowx || s->shadowy) {
if ((ret = draw_glyphs(s, frame, &shadowcolor, &metrics,
s->shadowx, s->shadowy, s->borderw)) < 0) {
return ret;
}
}
if (s->borderw) {
if ((ret = draw_glyphs(s, frame, &bordercolor, &metrics,
0, 0, s->borderw)) < 0) {
return ret;
}
}
if ((ret = draw_glyphs(s, frame, &fontcolor, &metrics, 0,
0, 0)) < 0) {
return ret;
}
}
// FREE data structures
for (int l = 0; l < s->line_count; ++l) {
TextLine *line = &s->lines[l];
av_freep(&line->glyphs);
hb_destroy(&line->hb_data);
}
av_freep(&s->lines);
av_freep(&s->tab_clusters);
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;
const AVDetectionBBoxHeader *header = NULL;
const AVDetectionBBox *bbox;
AVFrameSideData *sd;
int loop = 1;
if (s->text_source == AV_FRAME_DATA_DETECTION_BBOXES) {
sd = av_frame_get_side_data(frame, AV_FRAME_DATA_DETECTION_BBOXES);
if (sd) {
header = (AVDetectionBBoxHeader *)sd->data;
loop = header->nb_bboxes;
} else {
av_log(s, AV_LOG_WARNING, "No detection bboxes.\n");
return ff_filter_frame(outlink, frame);
}
}
if (s->reload && !(inlink->frame_count_out % s->reload)) {
if ((ret = ff_load_textfile(ctx, (const char *)s->textfile, &s->text, NULL)) < 0) {
av_frame_free(&frame);
return ret;
}
#if CONFIG_LIBFRIBIDI
if (s->text_shaping)
if ((ret = shape_text(ctx)) < 0) {
av_frame_free(&frame);
return ret;
}
#endif
}
s->var_values[VAR_N] = inlink->frame_count_out + s->start_number;
s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?
NAN : frame->pts * av_q2d(inlink->time_base);
s->var_values[VAR_PICT_TYPE] = frame->pict_type;
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
s->var_values[VAR_PKT_POS] = frame->pkt_pos;
s->var_values[VAR_PKT_SIZE] = frame->pkt_size;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
s->var_values[VAR_DURATION] = frame->duration * av_q2d(inlink->time_base);
s->metadata = frame->metadata;
for (int i = 0; i < loop; i++) {
if (header) {
bbox = av_get_detection_bbox(header, i);
strcpy(s->text, bbox->detect_label);
for (int j = 0; j < bbox->classify_count; j++) {
strcat(s->text, ", ");
strcat(s->text, bbox->classify_labels[j]);
}
s->x = bbox->x;
s->y = bbox->y - s->fontsize;
}
draw_text(ctx, frame);
}
return ff_filter_frame(outlink, frame);
}
static const AVFilterPad avfilter_vf_drawtext_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
const 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,
FILTER_INPUTS(avfilter_vf_drawtext_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_QUERY_FUNC(query_formats),
.process_command = command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
};
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