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Font sizes are relative to the subtitle frame dimensions. If the expected frame dimensions are not known, the font sizes will most likely be incorrect. Signed-off-by: Philip Langdale <philipl@overt.org>
140 lines
5.2 KiB
C
140 lines
5.2 KiB
C
/*
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* SSA/ASS common functions
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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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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#ifndef AVCODEC_ASS_H
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#define AVCODEC_ASS_H
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#include "avcodec.h"
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#include "libavutil/bprint.h"
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#define ASS_DEFAULT_PLAYRESX 384
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#define ASS_DEFAULT_PLAYRESY 288
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/**
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* @name Default values for ASS style
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* @{
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*/
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#define ASS_DEFAULT_FONT "Arial"
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#define ASS_DEFAULT_FONT_SIZE 16
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#define ASS_DEFAULT_COLOR 0xffffff
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#define ASS_DEFAULT_BACK_COLOR 0
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#define ASS_DEFAULT_BOLD 0
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#define ASS_DEFAULT_ITALIC 0
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#define ASS_DEFAULT_UNDERLINE 0
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#define ASS_DEFAULT_ALIGNMENT 2
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#define ASS_DEFAULT_BORDERSTYLE 1
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/** @} */
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typedef struct FFASSDecoderContext {
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int readorder;
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} FFASSDecoderContext;
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/**
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* Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
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* Can specify all fields explicitly
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*
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* @param avctx pointer to the AVCodecContext
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* @param play_res_x subtitle frame width
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* @param play_res_y subtitle frame height
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* @param font name of the default font face to use
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* @param font_size default font size to use
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* @param primary_color default text color to use (ABGR)
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* @param secondary_color default secondary text color to use (ABGR)
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* @param outline_color default outline color to use (ABGR)
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* @param back_color default background color to use (ABGR)
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* @param bold 1 for bold text, 0 for normal text
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* @param italic 1 for italic text, 0 for normal text
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* @param underline 1 for underline text, 0 for normal text
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* @param border_style 1 for outline, 3 for opaque box
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* @param alignment position of the text (left, center, top...), defined after
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* the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
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* @return >= 0 on success otherwise an error code <0
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*/
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int ff_ass_subtitle_header_full(AVCodecContext *avctx,
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int play_res_x, int play_res_y,
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const char *font, int font_size,
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int primary_color, int secondary_color,
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int outline_color, int back_color,
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int bold, int italic, int underline,
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int border_style, int alignment);
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/**
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* Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
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*
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* @param avctx pointer to the AVCodecContext
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* @param font name of the default font face to use
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* @param font_size default font size to use
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* @param color default text color to use (ABGR)
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* @param back_color default background color to use (ABGR)
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* @param bold 1 for bold text, 0 for normal text
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* @param italic 1 for italic text, 0 for normal text
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* @param underline 1 for underline text, 0 for normal text
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* @param alignment position of the text (left, center, top...), defined after
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* the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
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* @return >= 0 on success otherwise an error code <0
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*/
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int ff_ass_subtitle_header(AVCodecContext *avctx,
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const char *font, int font_size,
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int color, int back_color,
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int bold, int italic, int underline,
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int border_style, int alignment);
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/**
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* Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS
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* with default style.
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*
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* @param avctx pointer to the AVCodecContext
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* @return >= 0 on success otherwise an error code <0
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*/
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int ff_ass_subtitle_header_default(AVCodecContext *avctx);
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/**
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* Craft an ASS dialog string.
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*/
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char *ff_ass_get_dialog(int readorder, int layer, const char *style,
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const char *speaker, const char *text);
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/**
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* Add an ASS dialog to a subtitle.
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*/
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int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
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int readorder, int layer, const char *style,
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const char *speaker);
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/**
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* Helper to flush a text subtitles decoder making use of the
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* FFASSDecoderContext.
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*/
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void ff_ass_decoder_flush(AVCodecContext *avctx);
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/**
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* Escape a text subtitle using ASS syntax into an AVBPrint buffer.
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* Newline characters will be escaped to \N.
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*
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* @param buf pointer to an initialized AVBPrint buffer
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* @param p source text
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* @param size size of the source text
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* @param linebreaks additional newline chars, which will be escaped to \N
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* @param keep_ass_markup braces and backslash will not be escaped if set
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*/
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void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
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const char *linebreaks, int keep_ass_markup);
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#endif /* AVCODEC_ASS_H */
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