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https://git.ffmpeg.org/ffmpeg.git
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Port drawtext filter by Hemanth from the libavfilter soc repo, with
the following additions: * support to anti-aliased glyph rendering * support to UTF-8 text and Unicode chars rendering * support for RGB packed formats Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Stefano Sabatini
Michael Niedermayer
parent
704865fc87
commit
bd8e750300
6
configure
vendored
6
configure
vendored
@ -169,6 +169,7 @@ External library support:
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and libraw1394 [no]
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--enable-libdirac enable Dirac support via libdirac [no]
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--enable-libfaac enable FAAC support via libfaac [no]
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--enable-libfreetype enable libfreetype [no]
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--enable-libgsm enable GSM support via libgsm [no]
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--enable-libmp3lame enable MP3 encoding via libmp3lame [no]
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--enable-libnut enable NUT (de)muxing via libnut,
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@ -897,6 +898,7 @@ CONFIG_LIST="
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libdc1394
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libdirac
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libfaac
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libfreetype
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libgsm
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libmp3lame
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libnut
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@ -1043,6 +1045,7 @@ HAVE_LIST="
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llrintf
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local_aligned_16
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local_aligned_8
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localtime_r
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log2
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log2f
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loongson
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@ -1425,6 +1428,7 @@ udp_protocol_deps="network"
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# filters
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blackframe_filter_deps="gpl"
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cropdetect_filter_deps="gpl"
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drawtext_filter_deps="libfreetype"
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frei0r_filter_deps="frei0r dlopen strtok_r"
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frei0r_src_filter_deps="frei0r dlopen strtok_r"
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hqdn3d_filter_deps="gpl"
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@ -2740,6 +2744,7 @@ check_func getrusage
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check_struct "sys/time.h sys/resource.h" "struct rusage" ru_maxrss
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check_func inet_aton $network_extralibs
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check_func isatty
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check_func localtime_r
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check_func ${malloc_prefix}memalign && enable memalign
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check_func mkstemp
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check_func mmap
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@ -2826,6 +2831,7 @@ enabled libdirac && add_cflags $(pkg-config --cflags dirac) &&
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require libdirac libdirac_decoder/dirac_parser.h dirac_decoder_init $(pkg-config --libs dirac) &&
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require libdirac libdirac_encoder/dirac_encoder.h dirac_encoder_init $(pkg-config --libs dirac)
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enabled libfaac && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
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enabled libfreetype && add_cflags $(pkg-config --cflags freetype2) && require libfreetype ft2build.h FT_Init_FreeType -lfreetype
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enabled libgsm && require libgsm gsm/gsm.h gsm_create -lgsm
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enabled libmp3lame && require "libmp3lame >= 3.98.3" lame/lame.h lame_set_VBR_quality -lmp3lame
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enabled libnut && require libnut libnut.h nut_demuxer_init -lnut
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112
doc/filters.texi
112
doc/filters.texi
@ -386,6 +386,118 @@ fade=in:0:25, fade=out:975:25
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fade=in:5:20
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@end example
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@section drawtext
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Draw text string or text from specified file on top of video using the
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libfreetype library.
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To enable compilation of this filter you need to configure FFmpeg with
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@code{--enable-libfreetype}.
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The filter also recognizes strftime() sequences in the provided text
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and expands them accordingly. Check the documentation of strftime().
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The filter accepts parameters as a list of @var{key}=@var{value} pairs,
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separated by ":".
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The description of the accepted parameters follows.
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@table @option
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@item fontfile
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The font file to be used for drawing text. Path must be included.
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This parameter is mandatory.
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@item text
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The text string to be drawn. The text must be a sequence of UTF-8
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encoded characters.
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This parameter is mandatory if no file is specified.
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@item textfile
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A text file containing text to be drawn. The text must be a sequence
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of UTF-8 encoded characters
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This parameter is mandatory if no text string is specified.
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If both text and textfile are specified, an error is thrown.
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@item x, y
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The offsets where text will be drawn within the video frame.
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Relative to the top/left border of the output image.
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The default value of @var{x} and @var{y} is 0.
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@item fontsize
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The font size to be used for drawing text.
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The default value of @var{size} is 16.
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@item fontcolor
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The color to be used for drawing fonts.
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Either a string (e.g. "red") or in 0xRRGGBB[AA] format
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(e.g. "0xff000033"), possibly followed by an alpha specifier.
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The default value of @var{fontcolor} is "black".
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@item boxcolor
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The color to be used for drawing box around text.
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Either a string (e.g. "yellow") or in 0xRRGGBB[AA] format
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(e.g. "0xff00ff"), possibly followed by an alpha specifier.
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The default value of @var{bgcolor} is "white".
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@item box
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Used to draw a box around text using background color.
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Value should be either 1 (enable) or 0 (disable).
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The default value of @var{box} is 0.
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@item ft_load_flags
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Flags to be used for loading the fonts.
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The flags map the corresponding flags supported by libfreetype, and are
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a combination of the following values:
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@table @var
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@item default
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@item no_scale
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@item no_hinting
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@item render
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@item no_bitmap
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@item vertical_layout
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@item force_autohint
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@item crop_bitmap
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@item pedantic
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@item ignore_global_advance_width
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@item no_recurse
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@item ignore_transform
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@item monochrome
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@item linear_design
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@item no_autohint
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@item end table
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@end table
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Default value is "render".
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For more information consult the documentation for the FT_LOAD_*
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libfreetype flags.
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@item tabsize
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The size in number of spaces to use for rendering the tab.
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Default value is 4.
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@end table
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For example the command:
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@example
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drawtext=fontfile=FreeSerif.ttf: text='Test Text': x=100: y=50: fontsize=24: fontcolor=yellow@@0.2: boxcolor=red@@0.2: box=1"
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@end example
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will draw 'Test Text' with font FreeSerif of size 24 at position
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(100,50), text color is yellow, and draw a red box around text. Both
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the text and the box have an opacity of 20%.
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Note that the double quotes are not necessary if spaces are not used
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within the parameter list.
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For more information about libfreetype, check:
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@url{http://www.freetype.org/}
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@section fifo
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Buffer input images and send them when they are requested.
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@ -27,6 +27,7 @@ OBJS-$(CONFIG_COPY_FILTER) += vf_copy.o
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OBJS-$(CONFIG_CROP_FILTER) += vf_crop.o
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OBJS-$(CONFIG_CROPDETECT_FILTER) += vf_cropdetect.o
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OBJS-$(CONFIG_DRAWBOX_FILTER) += vf_drawbox.o
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OBJS-$(CONFIG_DRAWTEXT_FILTER) += vf_drawtext.o
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OBJS-$(CONFIG_FADE_FILTER) += vf_fade.o
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OBJS-$(CONFIG_FIFO_FILTER) += vf_fifo.o
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OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
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@ -45,6 +45,7 @@ void avfilter_register_all(void)
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REGISTER_FILTER (CROP, crop, vf);
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REGISTER_FILTER (CROPDETECT, cropdetect, vf);
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REGISTER_FILTER (DRAWBOX, drawbox, vf);
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REGISTER_FILTER (DRAWTEXT, drawtext, vf);
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REGISTER_FILTER (FADE, fade, vf);
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REGISTER_FILTER (FIFO, fifo, vf);
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REGISTER_FILTER (FORMAT, format, vf);
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650
libavfilter/vf_drawtext.c
Normal file
650
libavfilter/vf_drawtext.c
Normal file
@ -0,0 +1,650 @@
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/*
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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 FFmpeg vhook/drawtext.c
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* filter by Gustavo Sverzut Barbieri
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*/
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#include <sys/time.h>
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#include <time.h>
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#include "libavutil/colorspace.h"
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#include "libavutil/file.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/tree.h"
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#include "avfilter.h"
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#include "drawutils.h"
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#undef time
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#include <ft2build.h>
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#include <freetype/config/ftheader.h>
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
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#define MAX_EXPANDED_TEXT_SIZE 2048
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typedef struct {
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const AVClass *class;
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char *fontfile; ///< font to be used
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char *text; ///< text to be drawn
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int ft_load_flags; ///< flags used for loading fonts, see FT_LOAD_*
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/** buffer containing the text expanded by strftime */
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char expanded_text[MAX_EXPANDED_TEXT_SIZE];
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/** positions for each element in the text */
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FT_Vector positions[MAX_EXPANDED_TEXT_SIZE];
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char *textfile; ///< file with text to be drawn
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unsigned int x; ///< x position to start drawing text
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unsigned int y; ///< y position to start drawing text
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unsigned int fontsize; ///< font size to use
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char *fontcolor_string; ///< font color as string
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char *boxcolor_string; ///< box color as string
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uint8_t fontcolor[4]; ///< foreground color
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uint8_t boxcolor[4]; ///< background color
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uint8_t fontcolor_rgba[4]; ///< foreground color in RGBA
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uint8_t boxcolor_rgba[4]; ///< background color in RGBA
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short int draw_box; ///< draw box around text - true or false
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int use_kerning; ///< font kerning is used - true/false
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int tabsize; ///< tab size
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FT_Library library; ///< freetype font library handle
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FT_Face face; ///< freetype font face handle
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struct AVTreeNode *glyphs; ///< rendered glyphs, stored using the UTF-32 char code
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int hsub, vsub; ///< chroma subsampling values
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int is_packed_rgb;
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int pixel_step[4]; ///< distance in bytes between the component of each pixel
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uint8_t rgba_map[4]; ///< map RGBA offsets to the positions in the packed RGBA format
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uint8_t *box_line[4]; ///< line used for filling the box background
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} DrawTextContext;
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#define OFFSET(x) offsetof(DrawTextContext, x)
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static const AVOption drawtext_options[]= {
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{"fontfile", "set font file", OFFSET(fontfile), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
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{"text", "set text", OFFSET(text), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
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{"textfile", "set text file", OFFSET(textfile), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
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{"fontcolor","set foreground color", OFFSET(fontcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
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{"boxcolor", "set box color", OFFSET(boxcolor_string), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX },
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{"box", "set box", OFFSET(draw_box), FF_OPT_TYPE_INT, 0, 0, 1 },
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{"fontsize", "set font size", OFFSET(fontsize), FF_OPT_TYPE_INT, 16, 1, 72 },
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{"x", "set x", OFFSET(x), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
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{"y", "set y", OFFSET(y), FF_OPT_TYPE_INT, 0, 0, INT_MAX },
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{"tabsize", "set tab size", OFFSET(tabsize), FF_OPT_TYPE_INT, 4, 0, INT_MAX },
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/* FT_LOAD_* flags */
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{"ft_load_flags", "set font loading flags for libfreetype", OFFSET(ft_load_flags), FF_OPT_TYPE_FLAGS, FT_LOAD_DEFAULT|FT_LOAD_RENDER, 0, INT_MAX, 0, "ft_load_flags" },
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{"default", "set default", 0, FF_OPT_TYPE_CONST, FT_LOAD_DEFAULT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"no_scale", "set no_scale", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_SCALE, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"no_hinting", "set no_hinting", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_HINTING, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"render", "set render", 0, FF_OPT_TYPE_CONST, FT_LOAD_RENDER, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"no_bitmap", "set no_bitmap", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_BITMAP, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"vertical_layout", "set vertical_layout", 0, FF_OPT_TYPE_CONST, FT_LOAD_VERTICAL_LAYOUT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"force_autohint", "set force_autohint", 0, FF_OPT_TYPE_CONST, FT_LOAD_FORCE_AUTOHINT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"crop_bitmap", "set crop_bitmap", 0, FF_OPT_TYPE_CONST, FT_LOAD_CROP_BITMAP, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"pedantic", "set pedantic", 0, FF_OPT_TYPE_CONST, FT_LOAD_PEDANTIC, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"ignore_global_advance_width", "set ignore_global_advance_width", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"no_recurse", "set no_recurse", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_RECURSE, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"ignore_transform", "set ignore_transform", 0, FF_OPT_TYPE_CONST, FT_LOAD_IGNORE_TRANSFORM, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"monochrome", "set monochrome", 0, FF_OPT_TYPE_CONST, FT_LOAD_MONOCHROME, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"linear_design", "set linear_design", 0, FF_OPT_TYPE_CONST, FT_LOAD_LINEAR_DESIGN, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{"no_autohint", "set no_autohint", 0, FF_OPT_TYPE_CONST, FT_LOAD_NO_AUTOHINT, INT_MIN, INT_MAX, 0, "ft_load_flags" },
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{NULL},
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};
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static const char *drawtext_get_name(void *ctx)
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{
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return "drawtext";
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}
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static const AVClass drawtext_class = {
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"DrawTextContext",
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drawtext_get_name,
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drawtext_options
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};
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#undef __FTERRORS_H__
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#define FT_ERROR_START_LIST {
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#define FT_ERRORDEF(e, v, s) { (e), (s) },
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#define FT_ERROR_END_LIST { 0, NULL } };
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struct ft_error
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{
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int err;
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const char *err_msg;
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} static ft_errors[] =
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#include FT_ERRORS_H
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#define FT_ERRMSG(e) ft_errors[e].err_msg
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typedef struct {
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FT_Glyph *glyph;
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uint32_t code;
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FT_Bitmap bitmap; ///< array holding bitmaps of font
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FT_BBox bbox;
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int advance;
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int bitmap_left;
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int bitmap_top;
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} Glyph;
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static int glyph_cmp(const Glyph *a, const Glyph *b)
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{
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int64_t diff = (int64_t)a->code - (int64_t)b->code;
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return diff > 0 ? 1 : diff < 0 ? -1 : 0;
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}
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/**
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* Load glyphs corresponding to the UTF-32 codepoint code.
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*/
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static int load_glyph(AVFilterContext *ctx, Glyph **glyph_ptr, uint32_t code)
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{
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DrawTextContext *dtext = ctx->priv;
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Glyph *glyph = av_mallocz(sizeof(Glyph));
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struct AVTreeNode *node = NULL;
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int ret;
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/* load glyph into dtext->face->glyph */
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ret = FT_Load_Char(dtext->face, code, dtext->ft_load_flags);
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if (ret)
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return AVERROR(EINVAL);
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/* save glyph */
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glyph->code = code;
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glyph->glyph = av_mallocz(sizeof(FT_Glyph));
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ret = FT_Get_Glyph(dtext->face->glyph, glyph->glyph);
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if (ret)
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return AVERROR(EINVAL);
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glyph->bitmap = dtext->face->glyph->bitmap;
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glyph->bitmap_left = dtext->face->glyph->bitmap_left;
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glyph->bitmap_top = dtext->face->glyph->bitmap_top;
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glyph->advance = dtext->face->glyph->advance.x >> 6;
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/* measure text height to calculate text_height (or the maximum text height) */
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FT_Glyph_Get_CBox(*glyph->glyph, ft_glyph_bbox_pixels, &glyph->bbox);
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/* cache the newly created glyph */
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if (!node)
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node = av_mallocz(av_tree_node_size);
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av_tree_insert(&dtext->glyphs, glyph, (void *)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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}
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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int err;
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DrawTextContext *dtext = ctx->priv;
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dtext->class = &drawtext_class;
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av_opt_set_defaults2(dtext, 0, 0);
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dtext->fontcolor_string = av_strdup("black");
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dtext->boxcolor_string = av_strdup("white");
|
||||
|
||||
if ((err = (av_set_options_string(dtext, args, "=", ":"))) < 0) {
|
||||
av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
|
||||
return err;
|
||||
}
|
||||
|
||||
if (!dtext->fontfile) {
|
||||
av_log(ctx, AV_LOG_ERROR, "No font filename provided\n");
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
|
||||
if (dtext->textfile) {
|
||||
uint8_t *textbuf;
|
||||
size_t textbuf_size;
|
||||
|
||||
if (dtext->text) {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"Both text and text file provided. Please provide only one\n");
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
if ((err = av_file_map(dtext->textfile, &textbuf, &textbuf_size, 0, ctx)) < 0) {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"The text file '%s' could not be read or is empty\n",
|
||||
dtext->textfile);
|
||||
return err;
|
||||
}
|
||||
|
||||
if (!(dtext->text = av_malloc(textbuf_size+1)))
|
||||
return AVERROR(ENOMEM);
|
||||
memcpy(dtext->text, textbuf, textbuf_size);
|
||||
dtext->text[textbuf_size] = 0;
|
||||
av_file_unmap(textbuf, textbuf_size);
|
||||
}
|
||||
|
||||
if (!dtext->text) {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"Either text or a valid file must be provided\n");
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
|
||||
if ((err = av_parse_color(dtext->fontcolor_rgba, dtext->fontcolor_string, -1, ctx))) {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"Invalid font color '%s'\n", dtext->fontcolor_string);
|
||||
return err;
|
||||
}
|
||||
|
||||
if ((err = av_parse_color(dtext->boxcolor_rgba, dtext->boxcolor_string, -1, ctx))) {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"Invalid box color '%s'\n", dtext->boxcolor_string);
|
||||
return err;
|
||||
}
|
||||
|
||||
if ((err = FT_Init_FreeType(&(dtext->library)))) {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"Could not load FreeType: %s\n", FT_ERRMSG(err));
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
|
||||
/* load the face, and set up the encoding, which is by default UTF-8 */
|
||||
if ((err = FT_New_Face(dtext->library, dtext->fontfile, 0, &dtext->face))) {
|
||||
av_log(ctx, AV_LOG_ERROR, "Could not load fontface from file '%s': %s\n",
|
||||
dtext->fontfile, FT_ERRMSG(err));
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
if ((err = FT_Set_Pixel_Sizes(dtext->face, 0, dtext->fontsize))) {
|
||||
av_log(ctx, AV_LOG_ERROR, "Could not set font size to %d pixels: %s\n",
|
||||
dtext->fontsize, FT_ERRMSG(err));
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
|
||||
dtext->use_kerning = FT_HAS_KERNING(dtext->face);
|
||||
|
||||
/* load the fallback glyph with code 0 */
|
||||
load_glyph(ctx, NULL, 0);
|
||||
|
||||
#if !HAVE_LOCALTIME_R
|
||||
av_log(ctx, AV_LOG_WARNING, "strftime() expansion unavailable!\n");
|
||||
#else
|
||||
if (strlen(dtext->text) >= MAX_EXPANDED_TEXT_SIZE) {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"Impossible to print text, string is too big\n");
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int query_formats(AVFilterContext *ctx)
|
||||
{
|
||||
static const enum PixelFormat pix_fmts[] = {
|
||||
PIX_FMT_ARGB, PIX_FMT_RGBA,
|
||||
PIX_FMT_ABGR, PIX_FMT_BGRA,
|
||||
PIX_FMT_RGB24, PIX_FMT_BGR24,
|
||||
PIX_FMT_YUV420P, PIX_FMT_YUV444P,
|
||||
PIX_FMT_YUV422P, PIX_FMT_YUV411P,
|
||||
PIX_FMT_YUV410P, PIX_FMT_YUV440P,
|
||||
PIX_FMT_NONE
|
||||
};
|
||||
|
||||
avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int glyph_enu_free(void *opaque, void *elem)
|
||||
{
|
||||
av_free(elem);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static av_cold void uninit(AVFilterContext *ctx)
|
||||
{
|
||||
DrawTextContext *dtext = ctx->priv;
|
||||
int i;
|
||||
|
||||
av_freep(&dtext->fontfile);
|
||||
av_freep(&dtext->text);
|
||||
av_freep(&dtext->fontcolor_string);
|
||||
av_freep(&dtext->boxcolor_string);
|
||||
av_tree_enumerate(dtext->glyphs, NULL, NULL, glyph_enu_free);
|
||||
av_tree_destroy(dtext->glyphs);
|
||||
dtext->glyphs = 0;
|
||||
FT_Done_Face(dtext->face);
|
||||
FT_Done_FreeType(dtext->library);
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
av_freep(&dtext->box_line[i]);
|
||||
dtext->pixel_step[i] = 0;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static int config_input(AVFilterLink *inlink)
|
||||
{
|
||||
DrawTextContext *dtext = inlink->dst->priv;
|
||||
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
|
||||
int ret;
|
||||
|
||||
dtext->hsub = pix_desc->log2_chroma_w;
|
||||
dtext->vsub = pix_desc->log2_chroma_h;
|
||||
|
||||
if ((ret =
|
||||
ff_fill_line_with_color(dtext->box_line, dtext->pixel_step,
|
||||
inlink->w, dtext->boxcolor,
|
||||
inlink->format, dtext->boxcolor_rgba,
|
||||
&dtext->is_packed_rgb, dtext->rgba_map)) < 0)
|
||||
return ret;
|
||||
|
||||
if (!dtext->is_packed_rgb) {
|
||||
uint8_t *rgba = dtext->fontcolor_rgba;
|
||||
dtext->fontcolor[0] = RGB_TO_Y_CCIR(rgba[0], rgba[1], rgba[2]);
|
||||
dtext->fontcolor[1] = RGB_TO_U_CCIR(rgba[0], rgba[1], rgba[2], 0);
|
||||
dtext->fontcolor[2] = RGB_TO_V_CCIR(rgba[0], rgba[1], rgba[2], 0);
|
||||
dtext->fontcolor[3] = rgba[3];
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define GET_BITMAP_VAL(r, c) \
|
||||
bitmap->pixel_mode == FT_PIXEL_MODE_MONO ? \
|
||||
(bitmap->buffer[(r) * bitmap->pitch + ((c)>>3)] & (0x80 >> ((c)&7))) * 255 : \
|
||||
bitmap->buffer[(r) * bitmap->pitch + (c)]
|
||||
|
||||
#define SET_PIXEL_YUV(picref, yuva_color, val, x, y, hsub, vsub) { \
|
||||
luma_pos = ((x) ) + ((y) ) * picref->linesize[0]; \
|
||||
chroma_pos1 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[1]; \
|
||||
chroma_pos2 = ((x) >> (hsub)) + ((y) >> (vsub)) * picref->linesize[2]; \
|
||||
alpha = (yuva_color[3] * (val)) / 255; \
|
||||
picref->data[0][luma_pos] = (alpha * yuva_color[0] + (255 - alpha) * picref->data[0][luma_pos]) >> 8; \
|
||||
alpha = (yuva_color[3] * (val)) / 224; \
|
||||
picref->data[1][chroma_pos1] = 16 + (alpha * (yuva_color[1]-16) + (224 - alpha) * (picref->data[1][chroma_pos1]-16)) / 224; \
|
||||
picref->data[2][chroma_pos2] = 16 + (alpha * (yuva_color[2]-16) + (224 - alpha) * (picref->data[2][chroma_pos2]-16)) / 224; \
|
||||
}
|
||||
|
||||
static inline int draw_glyph_yuv(AVFilterBufferRef *picref, FT_Bitmap *bitmap, unsigned int x,
|
||||
unsigned int y, unsigned int width, unsigned int height,
|
||||
unsigned char yuva_color[4], int hsub, int vsub)
|
||||
{
|
||||
int r, c, alpha;
|
||||
unsigned int luma_pos, chroma_pos1, chroma_pos2;
|
||||
uint8_t src_val, dst_pixel[4];
|
||||
|
||||
for (r = 0; r < bitmap->rows && r+y < height; r++) {
|
||||
for (c = 0; c < bitmap->width && c+x < width; c++) {
|
||||
/* get pixel in the picref (destination) */
|
||||
dst_pixel[0] = picref->data[0][ c+x + (y+r) * picref->linesize[0]];
|
||||
dst_pixel[1] = picref->data[1][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[1]];
|
||||
dst_pixel[2] = picref->data[2][((c+x) >> hsub) + ((y+r) >> vsub) * picref->linesize[2]];
|
||||
|
||||
/* get intensity value in the glyph bitmap (source) */
|
||||
src_val = GET_BITMAP_VAL(r, c);
|
||||
if (!src_val)
|
||||
continue;
|
||||
|
||||
SET_PIXEL_YUV(picref, yuva_color, src_val, c+x, y+r, hsub, vsub);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define SET_PIXEL_RGB(picref, rgba_color, val, x, y, pixel_step, r_off, g_off, b_off, a_off) { \
|
||||
p = picref->data[0] + (x) * pixel_step + ((y) * picref->linesize[0]); \
|
||||
alpha = (rgba_color[3] * (val)) / 255; \
|
||||
*(p+r_off) = (alpha * rgba_color[0] + (255 - alpha) * *(p+r_off)) >> 8; \
|
||||
*(p+g_off) = (alpha * rgba_color[1] + (255 - alpha) * *(p+g_off)) >> 8; \
|
||||
*(p+b_off) = (alpha * rgba_color[2] + (255 - alpha) * *(p+b_off)) >> 8; \
|
||||
}
|
||||
|
||||
static inline int draw_glyph_rgb(AVFilterBufferRef *picref, FT_Bitmap *bitmap,
|
||||
unsigned int x, unsigned int y,
|
||||
unsigned int width, unsigned int height, int pixel_step,
|
||||
unsigned char rgba_color[4], uint8_t rgba_map[4])
|
||||
{
|
||||
int r, c, alpha;
|
||||
uint8_t *p;
|
||||
uint8_t src_val, dst_pixel[4];
|
||||
|
||||
for (r = 0; r < bitmap->rows && r+y < height; r++) {
|
||||
for (c = 0; c < bitmap->width && c+x < width; c++) {
|
||||
/* get pixel in the picref (destination) */
|
||||
dst_pixel[0] = picref->data[0][(c+x + rgba_map[0]) * pixel_step +
|
||||
(y+r) * picref->linesize[0]];
|
||||
dst_pixel[1] = picref->data[0][(c+x + rgba_map[1]) * pixel_step +
|
||||
(y+r) * picref->linesize[0]];
|
||||
dst_pixel[2] = picref->data[0][(c+x + rgba_map[2]) * pixel_step +
|
||||
(y+r) * picref->linesize[0]];
|
||||
|
||||
/* get intensity value in the glyph bitmap (source) */
|
||||
src_val = GET_BITMAP_VAL(r, c);
|
||||
if (!src_val)
|
||||
continue;
|
||||
|
||||
SET_PIXEL_RGB(picref, rgba_color, src_val, c+x, y+r, pixel_step,
|
||||
rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void drawbox(AVFilterBufferRef *picref, unsigned int x, unsigned int y,
|
||||
unsigned int width, unsigned int height,
|
||||
uint8_t *line[4], int pixel_step[4], uint8_t color[4],
|
||||
int hsub, int vsub, int is_rgba_packed, uint8_t rgba_map[4])
|
||||
{
|
||||
int i, j, alpha;
|
||||
|
||||
if (color[3] != 0xFF) {
|
||||
if (is_rgba_packed) {
|
||||
uint8_t *p;
|
||||
for (j = 0; j < height; j++)
|
||||
for (i = 0; i < width; i++)
|
||||
SET_PIXEL_RGB(picref, color, 255, i+x, y+j, pixel_step[0],
|
||||
rgba_map[0], rgba_map[1], rgba_map[2], rgba_map[3]);
|
||||
} else {
|
||||
unsigned int luma_pos, chroma_pos1, chroma_pos2;
|
||||
for (j = 0; j < height; j++)
|
||||
for (i = 0; i < width; i++)
|
||||
SET_PIXEL_YUV(picref, color, 255, i+x, y+j, hsub, vsub);
|
||||
}
|
||||
} else {
|
||||
ff_draw_rectangle(picref->data, picref->linesize,
|
||||
line, pixel_step, hsub, vsub,
|
||||
x, y, width, height);
|
||||
}
|
||||
}
|
||||
|
||||
static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
|
||||
int width, int height)
|
||||
{
|
||||
DrawTextContext *dtext = ctx->priv;
|
||||
char *text = dtext->text;
|
||||
uint32_t code = 0, prev_code = 0;
|
||||
int x = 0, y = 0, i = 0;
|
||||
int text_height, baseline;
|
||||
uint8_t *p;
|
||||
int str_w, str_w_max;
|
||||
int y_min = 32000, y_max = -32000;
|
||||
FT_Vector delta;
|
||||
Glyph *glyph = NULL, *prev_glyph = NULL;
|
||||
Glyph dummy = { 0 };
|
||||
|
||||
#if HAVE_LOCALTIME_R
|
||||
time_t now = time(0);
|
||||
struct tm ltime;
|
||||
size_t expanded_text_len;
|
||||
|
||||
dtext->expanded_text[0] = '\1';
|
||||
expanded_text_len = strftime(dtext->expanded_text, MAX_EXPANDED_TEXT_SIZE,
|
||||
text, localtime_r(&now, <ime));
|
||||
text = dtext->expanded_text;
|
||||
if (expanded_text_len == 0 && dtext->expanded_text[0] != '\0') {
|
||||
av_log(ctx, AV_LOG_ERROR,
|
||||
"Impossible to print text, string is too big\n");
|
||||
return AVERROR(EINVAL);
|
||||
}
|
||||
#endif
|
||||
|
||||
str_w = str_w_max = 0;
|
||||
x = dtext->x;
|
||||
y = dtext->y;
|
||||
|
||||
/* load and cache glyphs */
|
||||
for (i = 0, p = text; *p; i++) {
|
||||
GET_UTF8(code, *p++, continue;);
|
||||
|
||||
/* get glyph */
|
||||
dummy.code = code;
|
||||
glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
|
||||
if (!glyph)
|
||||
load_glyph(ctx, &glyph, code);
|
||||
|
||||
y_min = FFMIN(glyph->bbox.yMin, y_min);
|
||||
y_max = FFMAX(glyph->bbox.yMax, y_max);
|
||||
}
|
||||
text_height = y_max - y_min;
|
||||
baseline = y_max;
|
||||
|
||||
/* 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;
|
||||
|
||||
/* get glyph */
|
||||
prev_glyph = glyph;
|
||||
dummy.code = code;
|
||||
glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
|
||||
|
||||
/* kerning */
|
||||
if (dtext->use_kerning && prev_glyph && glyph->code) {
|
||||
FT_Get_Kerning(dtext->face, prev_glyph->code, glyph->code,
|
||||
ft_kerning_default, &delta);
|
||||
x += delta.x >> 6;
|
||||
}
|
||||
|
||||
if (x + glyph->advance >= width || code == '\r' || code == '\n') {
|
||||
if (x + glyph->advance >= width)
|
||||
str_w_max = width - dtext->x - 1;
|
||||
y += text_height;
|
||||
x = dtext->x;
|
||||
}
|
||||
|
||||
/* save position */
|
||||
dtext->positions[i].x = x + glyph->bitmap_left;
|
||||
dtext->positions[i].y = y - glyph->bitmap_top + baseline;
|
||||
if (code != '\n' && code != '\r') {
|
||||
int advance = glyph->advance;
|
||||
if (code == '\t')
|
||||
advance *= dtext->tabsize;
|
||||
x += advance;
|
||||
str_w += advance;
|
||||
}
|
||||
prev_code = code;
|
||||
}
|
||||
|
||||
y += text_height;
|
||||
if (str_w_max == 0)
|
||||
str_w_max = str_w;
|
||||
|
||||
/* draw box */
|
||||
if (dtext->draw_box) {
|
||||
/* check if it doesn't pass the limits */
|
||||
str_w_max = FFMIN(str_w_max, width - dtext->x - 1);
|
||||
y = FFMIN(y, height - 1);
|
||||
|
||||
/* draw background */
|
||||
drawbox(picref, dtext->x, dtext->y, str_w_max, y-dtext->y,
|
||||
dtext->box_line, dtext->pixel_step, dtext->boxcolor,
|
||||
dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
|
||||
}
|
||||
|
||||
/* draw glyphs */
|
||||
for (i = 0, p = text; *p; i++) {
|
||||
Glyph dummy = { 0 };
|
||||
GET_UTF8(code, *p++, continue;);
|
||||
|
||||
/* skip new line chars, just go to new line */
|
||||
if (code == '\n' || code == '\r' || code == '\t')
|
||||
continue;
|
||||
|
||||
dummy.code = code;
|
||||
glyph = av_tree_find(dtext->glyphs, &dummy, (void *)glyph_cmp, NULL);
|
||||
|
||||
if (glyph->bitmap.pixel_mode != FT_PIXEL_MODE_MONO &&
|
||||
glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY)
|
||||
return AVERROR(EINVAL);
|
||||
|
||||
if (dtext->is_packed_rgb) {
|
||||
draw_glyph_rgb(picref, &glyph->bitmap,
|
||||
dtext->positions[i].x, dtext->positions[i].y, width, height,
|
||||
dtext->pixel_step[0], dtext->fontcolor_rgba, dtext->rgba_map);
|
||||
} else {
|
||||
draw_glyph_yuv(picref, &glyph->bitmap,
|
||||
dtext->positions[i].x, dtext->positions[i].y, width, height,
|
||||
dtext->fontcolor, dtext->hsub, dtext->vsub);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
|
||||
|
||||
static void end_frame(AVFilterLink *inlink)
|
||||
{
|
||||
AVFilterLink *outlink = inlink->dst->outputs[0];
|
||||
AVFilterBufferRef *picref = inlink->cur_buf;
|
||||
|
||||
draw_text(inlink->dst, picref, picref->video->w, picref->video->h);
|
||||
|
||||
avfilter_draw_slice(outlink, 0, picref->video->h, 1);
|
||||
avfilter_end_frame(outlink);
|
||||
}
|
||||
|
||||
AVFilter avfilter_vf_drawtext = {
|
||||
.name = "drawtext",
|
||||
.description = NULL_IF_CONFIG_SMALL("Draw text on top of video frames using libfreetype library."),
|
||||
.priv_size = sizeof(DrawTextContext),
|
||||
.init = init,
|
||||
.uninit = uninit,
|
||||
.query_formats = query_formats,
|
||||
|
||||
.inputs = (AVFilterPad[]) {{ .name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO,
|
||||
.get_video_buffer = avfilter_null_get_video_buffer,
|
||||
.start_frame = avfilter_null_start_frame,
|
||||
.draw_slice = null_draw_slice,
|
||||
.end_frame = end_frame,
|
||||
.config_props = config_input,
|
||||
.min_perms = AV_PERM_WRITE |
|
||||
AV_PERM_READ,
|
||||
.rej_perms = AV_PERM_PRESERVE },
|
||||
{ .name = NULL}},
|
||||
.outputs = (AVFilterPad[]) {{ .name = "default",
|
||||
.type = AVMEDIA_TYPE_VIDEO, },
|
||||
{ .name = NULL}},
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user