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ass.h
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1 /*
2  * SSA/ASS common functions
3  * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVCODEC_ASS_H
23 #define AVCODEC_ASS_H
24 
25 #include "avcodec.h"
26 
27 /**
28  * @name Default values for ASS style
29  * @{
30  */
31 #define ASS_DEFAULT_FONT "Arial"
32 #define ASS_DEFAULT_FONT_SIZE 16
33 #define ASS_DEFAULT_COLOR 0xffffff
34 #define ASS_DEFAULT_BACK_COLOR 0
35 #define ASS_DEFAULT_BOLD 0
36 #define ASS_DEFAULT_ITALIC 0
37 #define ASS_DEFAULT_UNDERLINE 0
38 #define ASS_DEFAULT_ALIGNMENT 2
39 /** @} */
40 
41 /**
42  * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
43  *
44  * @param avctx pointer to the AVCodecContext
45  * @param font name of the default font face to use
46  * @param font_size default font size to use
47  * @param color default text color to use (ABGR)
48  * @param back_color default background color to use (ABGR)
49  * @param bold 1 for bold text, 0 for normal text
50  * @param italic 1 for italic text, 0 for normal text
51  * @param underline 1 for underline text, 0 for normal text
52  * @param alignment position of the text (left, center, top...), defined after
53  * the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
54  * @return >= 0 on success otherwise an error code <0
55  */
57  const char *font, int font_size,
58  int color, int back_color,
59  int bold, int italic, int underline,
60  int alignment);
61 
62 /**
63  * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS
64  * with default style.
65  *
66  * @param avctx pointer to the AVCodecContext
67  * @return >= 0 on success otherwise an error code <0
68  */
70 
71 /**
72  * Add an ASS dialog line to an AVSubtitle as a new AVSubtitleRect.
73  *
74  * @param sub pointer to the AVSubtitle
75  * @param dialog ASS dialog to add to sub
76  * @param ts_start start timestamp for this dialog (in 1/100 second unit)
77  * @param duration duration for this dialog (in 1/100 second unit), can be -1
78  * to last until the end of the presentation
79  * @param raw when set to 2, it indicates that dialog contains an ASS
80  * dialog line as muxed in Matroska
81  * when set to 1, it indicates that dialog contains a whole SSA
82  * dialog line which should be copied as is.
83  * when set to 0, it indicates that dialog contains only the Text
84  * part of the ASS dialog line, the rest of the line
85  * will be generated.
86  * @return number of characters read from dialog. It can be less than the whole
87  * length of dialog, if dialog contains several lines of text.
88  * A negative value indicates an error.
89  */
90 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
91  int ts_start, int duration, int raw);
92 
93 #endif /* AVCODEC_ASS_H */