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FFmpeg/libavcodec/ass.h
John Stebbins b8d4a66b29 lavc/movtextdec: allow setting subtitle frame dimensions
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>
2020-04-10 09:32:13 -07:00

140 lines
5.2 KiB
C

/*
* 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"
#define ASS_DEFAULT_PLAYRESX 384
#define ASS_DEFAULT_PLAYRESY 288
/**
* @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
#define ASS_DEFAULT_BORDERSTYLE 1
/** @} */
typedef struct FFASSDecoderContext {
int readorder;
} FFASSDecoderContext;
/**
* Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
* Can specify all fields explicitly
*
* @param avctx pointer to the AVCodecContext
* @param play_res_x subtitle frame width
* @param play_res_y subtitle frame height
* @param font name of the default font face to use
* @param font_size default font size to use
* @param primary_color default text color to use (ABGR)
* @param secondary_color default secondary text color to use (ABGR)
* @param outline_color default outline 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 border_style 1 for outline, 3 for opaque box
* @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_full(AVCodecContext *avctx,
int play_res_x, int play_res_y,
const char *font, int font_size,
int primary_color, int secondary_color,
int outline_color, int back_color,
int bold, int italic, int underline,
int border_style, int alignment);
/**
* 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 border_style, 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);
/**
* Craft an ASS dialog string.
*/
char *ff_ass_get_dialog(int readorder, int layer, const char *style,
const char *speaker, const char *text);
/**
* Add an ASS dialog to a subtitle.
*/
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int readorder, int layer, const char *style,
const char *speaker);
/**
* Helper to flush a text subtitles decoder making use of the
* FFASSDecoderContext.
*/
void ff_ass_decoder_flush(AVCodecContext *avctx);
/**
* 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 */