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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 #include "libavutil/bprint.h"
27 
28 #define ASS_DEFAULT_PLAYRESX 384
29 #define ASS_DEFAULT_PLAYRESY 288
30 
31 /**
32  * @name Default values for ASS style
33  * @{
34  */
35 #define ASS_DEFAULT_FONT "Arial"
36 #define ASS_DEFAULT_FONT_SIZE 16
37 #define ASS_DEFAULT_COLOR 0xffffff
38 #define ASS_DEFAULT_BACK_COLOR 0
39 #define ASS_DEFAULT_BOLD 0
40 #define ASS_DEFAULT_ITALIC 0
41 #define ASS_DEFAULT_UNDERLINE 0
42 #define ASS_DEFAULT_ALIGNMENT 2
43 /** @} */
44 
45 /**
46  * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
47  *
48  * @param avctx pointer to the AVCodecContext
49  * @param font name of the default font face to use
50  * @param font_size default font size to use
51  * @param color default text color to use (ABGR)
52  * @param back_color default background color to use (ABGR)
53  * @param bold 1 for bold text, 0 for normal text
54  * @param italic 1 for italic text, 0 for normal text
55  * @param underline 1 for underline text, 0 for normal text
56  * @param alignment position of the text (left, center, top...), defined after
57  * the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
58  * @return >= 0 on success otherwise an error code <0
59  */
61  const char *font, int font_size,
62  int color, int back_color,
63  int bold, int italic, int underline,
64  int alignment);
65 
66 /**
67  * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS
68  * with default style.
69  *
70  * @param avctx pointer to the AVCodecContext
71  * @return >= 0 on success otherwise an error code <0
72  */
74 
75 /**
76  * Add an ASS dialog line to an AVSubtitle as a new AVSubtitleRect.
77  *
78  * @param sub pointer to the AVSubtitle
79  * @param dialog ASS dialog to add to sub
80  * @param ts_start start timestamp for this dialog (in 1/100 second unit)
81  * @param duration duration for this dialog (in 1/100 second unit), can be -1
82  * to last until the end of the presentation
83  * @param raw when set to 2, it indicates that dialog contains an ASS
84  * dialog line as muxed in Matroska
85  * when set to 1, it indicates that dialog contains a whole SSA
86  * dialog line which should be copied as is.
87  * when set to 0, it indicates that dialog contains only the Text
88  * part of the ASS dialog line, the rest of the line
89  * will be generated.
90  * @return number of characters read from dialog. It can be less than the whole
91  * length of dialog, if dialog contains several lines of text.
92  * A negative value indicates an error.
93  */
94 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
95  int ts_start, int duration, int raw);
96 
97 /**
98  * Same as ff_ass_add_rect_bprint, but taking an AVBPrint buffer instead of a
99  * string, and assuming raw=0.
100  */
101 int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf,
102  int ts_start, int duration);
103 
104 /**
105  * Add an ASS dialog line to an AVBPrint buffer.
106  *
107  * @param buf pointer to an initialized AVBPrint buffer
108  * @param dialog ASS dialog to add to sub
109  * @param ts_start start timestamp for this dialog (in 1/100 second unit)
110  * @param duration duration for this dialog (in 1/100 second unit), can be -1
111  * to last until the end of the presentation
112  * @param raw when set to 2, it indicates that dialog contains an ASS
113  * dialog line as muxed in Matroska
114  * when set to 1, it indicates that dialog contains a whole SSA
115  * dialog line which should be copied as is.
116  * when set to 0, it indicates that dialog contains only the Text
117  * part of the ASS dialog line, the rest of the line
118  * will be generated.
119  * @return number of characters read from dialog. It can be less than the whole
120  * length of dialog, if dialog contains several lines of text.
121  * A negative value indicates an error.
122  */
123 int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog,
124  int ts_start, int duration, int raw);
125 
126 /**
127  * Escape a text subtitle using ASS syntax into an AVBPrint buffer.
128  * Newline characters will be escaped to \N.
129  *
130  * @param buf pointer to an initialized AVBPrint buffer
131  * @param p source text
132  * @param size size of the source text
133  * @param linebreaks additional newline chars, which will be escaped to \N
134  * @param keep_ass_markup braces and backslash will not be escaped if set
135  */
136 void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
137  const char *linebreaks, int keep_ass_markup);
138 #endif /* AVCODEC_ASS_H */
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS with default style.
Definition: ass.c:80
int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf, int ts_start, int duration)
Same as ff_ass_add_rect_bprint, but taking an AVBPrint buffer instead of a string, and assuming raw=0.
Definition: ass.c:178
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, int ts_start, int duration, int raw)
Add an ASS dialog line to an AVSubtitle as a new AVSubtitleRect.
Definition: ass.c:144
ptrdiff_t size
Definition: opengl_enc.c:101
static int64_t duration
Definition: ffplay.c:326
int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog, int ts_start, int duration, int raw)
Add an ASS dialog line to an AVBPrint buffer.
Definition: ass.c:106
Libavcodec external API header.
void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size, const char *linebreaks, int keep_ass_markup)
Escape a text subtitle using ASS syntax into an AVBPrint buffer.
Definition: ass.c:187
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.
Definition: ass.c:29
main external API structure.
Definition: avcodec.h:1502
void * buf
Definition: avisynth_c.h:553