FFmpeg
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 #define ASS_DEFAULT_BORDERSTYLE 1
44 /** @} */
45 
46 typedef struct FFASSDecoderContext {
47  int readorder;
49 
50 /**
51  * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
52  * Can specify all fields explicitly
53  *
54  * @param avctx pointer to the AVCodecContext
55  * @param play_res_x subtitle frame width
56  * @param play_res_y subtitle frame height
57  * @param font name of the default font face to use
58  * @param font_size default font size to use
59  * @param primary_color default text color to use (ABGR)
60  * @param secondary_color default secondary text color to use (ABGR)
61  * @param outline_color default outline color to use (ABGR)
62  * @param back_color default background color to use (ABGR)
63  * @param bold 1 for bold text, 0 for normal text
64  * @param italic 1 for italic text, 0 for normal text
65  * @param underline 1 for underline text, 0 for normal text
66  * @param border_style 1 for outline, 3 for opaque box
67  * @param alignment position of the text (left, center, top...), defined after
68  * the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
69  * @return >= 0 on success otherwise an error code <0
70  */
72  int play_res_x, int play_res_y,
73  const char *font, int font_size,
74  int primary_color, int secondary_color,
75  int outline_color, int back_color,
76  int bold, int italic, int underline,
77  int border_style, int alignment);
78 /**
79  * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
80  *
81  * @param avctx pointer to the AVCodecContext
82  * @param font name of the default font face to use
83  * @param font_size default font size to use
84  * @param color default text color to use (ABGR)
85  * @param back_color default background color to use (ABGR)
86  * @param bold 1 for bold text, 0 for normal text
87  * @param italic 1 for italic text, 0 for normal text
88  * @param underline 1 for underline text, 0 for normal text
89  * @param alignment position of the text (left, center, top...), defined after
90  * the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
91  * @return >= 0 on success otherwise an error code <0
92  */
94  const char *font, int font_size,
95  int color, int back_color,
96  int bold, int italic, int underline,
97  int border_style, int alignment);
98 
99 /**
100  * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS
101  * with default style.
102  *
103  * @param avctx pointer to the AVCodecContext
104  * @return >= 0 on success otherwise an error code <0
105  */
107 
108 /**
109  * Craft an ASS dialog string.
110  */
111 char *ff_ass_get_dialog(int readorder, int layer, const char *style,
112  const char *speaker, const char *text);
113 
114 /**
115  * Add an ASS dialog to a subtitle.
116  */
117 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
118  int readorder, int layer, const char *style,
119  const char *speaker);
120 
121 /**
122  * Helper to flush a text subtitles decoder making use of the
123  * FFASSDecoderContext.
124  */
126 
127 /**
128  * Escape a text subtitle using ASS syntax into an AVBPrint buffer.
129  * Newline characters will be escaped to \N.
130  *
131  * @param buf pointer to an initialized AVBPrint buffer
132  * @param p source text
133  * @param size size of the source text
134  * @param linebreaks additional newline chars, which will be escaped to \N
135  * @param keep_ass_markup braces and backslash will not be escaped if set
136  */
137 void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
138  const char *linebreaks, int keep_ass_markup);
139 #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:97
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.
Definition: ass.c:83
ptrdiff_t size
Definition: opengl_enc.c:100
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:148
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.
Definition: ass.c:29
char * ff_ass_get_dialog(int readorder, int layer, const char *style, const char *speaker, const char *text)
Craft an ASS dialog string.
Definition: ass.c:110
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:526
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, int readorder, int layer, const char *style, const char *speaker)
Add an ASS dialog to a subtitle.
Definition: ass.c:118
static float sub(float src0, float src1)
void ff_ass_decoder_flush(AVCodecContext *avctx)
Helper to flush a text subtitles decoder making use of the FFASSDecoderContext.
Definition: ass.c:141