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/*
* SSA/ASS common functions
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
*
* 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
*/
#ifndef AVCODEC_ASS_H
#define AVCODEC_ASS_H
#include "avcodec.h"
#include "libavutil/bprint.h"
/**
* @name Default values for ASS style
* @{
*/
#define ASS_DEFAULT_FONT "Arial"
#define ASS_DEFAULT_FONT_SIZE 16
#define ASS_DEFAULT_COLOR 0xffffff
#define ASS_DEFAULT_BACK_COLOR 0
#define ASS_DEFAULT_BOLD 0
#define ASS_DEFAULT_ITALIC 0
#define ASS_DEFAULT_UNDERLINE 0
#define ASS_DEFAULT_ALIGNMENT 2
/** @} */
/**
* Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
*
* @param avctx pointer to the AVCodecContext
* @param font name of the default font face to use
* @param font_size default font size to use
* @param color default text color to use (ABGR)
* @param back_color default background color to use (ABGR)
* @param bold 1 for bold text, 0 for normal text
* @param italic 1 for italic text, 0 for normal text
* @param underline 1 for underline text, 0 for normal text
* @param alignment position of the text (left, center, top...), defined after
* the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
* @return >= 0 on success otherwise an error code <0
*/
int ff_ass_subtitle_header(AVCodecContext *avctx,
const char *font, int font_size,
int color, int back_color,
int bold, int italic, int underline,
int alignment);
/**
* Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS
* with default style.
*
* @param avctx pointer to the AVCodecContext
* @return >= 0 on success otherwise an error code <0
*/
int ff_ass_subtitle_header_default(AVCodecContext *avctx);
/**
* Add an ASS dialog line to an AVSubtitle as a new AVSubtitleRect.
*
* @param sub pointer to the AVSubtitle
* @param dialog ASS dialog to add to sub
* @param ts_start start timestamp for this dialog (in 1/100 second unit)
* @param duration duration for this dialog (in 1/100 second unit), can be -1
* to last until the end of the presentation
* @param raw when set to 2, it indicates that dialog contains an ASS
* dialog line as muxed in Matroska
* when set to 1, it indicates that dialog contains a whole SSA
* dialog line which should be copied as is.
* when set to 0, it indicates that dialog contains only the Text
* part of the ASS dialog line, the rest of the line
* will be generated.
* @return number of characters read from dialog. It can be less than the whole
* length of dialog, if dialog contains several lines of text.
* A negative value indicates an error.
*/
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int ts_start, int duration, int raw);
/**
* Same as ff_ass_add_rect_bprint, but taking an AVBPrint buffer instead of a
* string, and assuming raw=0.
*/
int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf,
int ts_start, int duration);
/**
* Add an ASS dialog line to an AVBPrint buffer.
*
* @param buf pointer to an initialized AVBPrint buffer
* @param dialog ASS dialog to add to sub
* @param ts_start start timestamp for this dialog (in 1/100 second unit)
* @param duration duration for this dialog (in 1/100 second unit), can be -1
* to last until the end of the presentation
* @param raw when set to 2, it indicates that dialog contains an ASS
* dialog line as muxed in Matroska
* when set to 1, it indicates that dialog contains a whole SSA
* dialog line which should be copied as is.
* when set to 0, it indicates that dialog contains only the Text
* part of the ASS dialog line, the rest of the line
* will be generated.
* @return number of characters read from dialog. It can be less than the whole
* length of dialog, if dialog contains several lines of text.
* A negative value indicates an error.
*/
int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog,
int ts_start, int duration, int raw);
/**
* Escape a text subtitle using ASS syntax into an AVBPrint buffer.
* Newline characters will be escaped to \N.
*
* @param buf pointer to an initialized AVBPrint buffer
* @param p source text
* @param size size of the source text
* @param linebreaks additional newline chars, which will be escaped to \N
* @param keep_ass_markup braces and backslash will not be escaped if set
*/
void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
const char *linebreaks, int keep_ass_markup);
#endif /* AVCODEC_ASS_H */
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