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 #include "avcodec.h"
23 #include "ass.h"
24 #include "libavutil/avassert.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/bprint.h"
27 #include "libavutil/common.h"
28
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)29 int ff_ass_subtitle_header_full(AVCodecContext *avctx,
30 int play_res_x, int play_res_y,
31 const char *font, int font_size,
32 int primary_color, int secondary_color,
33 int outline_color, int back_color,
34 int bold, int italic, int underline,
35 int border_style, int alignment)
36 {
37 avctx->subtitle_header = av_asprintf(
38 "[Script Info]\r\n"
39 "; Script generated by FFmpeg/Lavc%s\r\n"
40 "ScriptType: v4.00+\r\n"
41 "PlayResX: %d\r\n"
42 "PlayResY: %d\r\n"
43 "ScaledBorderAndShadow: yes\r\n"
44 "\r\n"
45 "[V4+ Styles]\r\n"
46
47 /* ASSv4 header */
48 "Format: Name, "
49 "Fontname, Fontsize, "
50 "PrimaryColour, SecondaryColour, OutlineColour, BackColour, "
51 "Bold, Italic, Underline, StrikeOut, "
52 "ScaleX, ScaleY, "
53 "Spacing, Angle, "
54 "BorderStyle, Outline, Shadow, "
55 "Alignment, MarginL, MarginR, MarginV, "
56 "Encoding\r\n"
57
58 "Style: "
59 "Default," /* Name */
60 "%s,%d," /* Font{name,size} */
61 "&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */
62 "%d,%d,%d,0," /* Bold, Italic, Underline, StrikeOut */
63 "100,100," /* Scale{X,Y} */
64 "0,0," /* Spacing, Angle */
65 "%d,1,0," /* BorderStyle, Outline, Shadow */
66 "%d,10,10,10," /* Alignment, Margin[LRV] */
67 "0\r\n" /* Encoding */
68
69 "\r\n"
70 "[Events]\r\n"
71 "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
72 !(avctx->flags & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "",
73 play_res_x, play_res_y, font, font_size,
74 primary_color, secondary_color, outline_color, back_color,
75 -bold, -italic, -underline, border_style, alignment);
76
77 if (!avctx->subtitle_header)
78 return AVERROR(ENOMEM);
79 avctx->subtitle_header_size = strlen(avctx->subtitle_header);
80 return 0;
81 }
82
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)83 int ff_ass_subtitle_header(AVCodecContext *avctx,
84 const char *font, int font_size,
85 int color, int back_color,
86 int bold, int italic, int underline,
87 int border_style, int alignment)
88 {
89 return ff_ass_subtitle_header_full(avctx,
90 ASS_DEFAULT_PLAYRESX, ASS_DEFAULT_PLAYRESY,
91 font, font_size, color, color,
92 back_color, back_color,
93 bold, italic, underline,
94 border_style, alignment);
95 }
96
ff_ass_subtitle_header_default(AVCodecContext * avctx)97 int ff_ass_subtitle_header_default(AVCodecContext *avctx)
98 {
99 return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
100 ASS_DEFAULT_FONT_SIZE,
101 ASS_DEFAULT_COLOR,
102 ASS_DEFAULT_BACK_COLOR,
103 ASS_DEFAULT_BOLD,
104 ASS_DEFAULT_ITALIC,
105 ASS_DEFAULT_UNDERLINE,
106 ASS_DEFAULT_BORDERSTYLE,
107 ASS_DEFAULT_ALIGNMENT);
108 }
109
ff_ass_get_dialog(int readorder,int layer,const char * style,const char * speaker,const char * text)110 char *ff_ass_get_dialog(int readorder, int layer, const char *style,
111 const char *speaker, const char *text)
112 {
113 return av_asprintf("%d,%d,%s,%s,0,0,0,,%s",
114 readorder, layer, style ? style : "Default",
115 speaker ? speaker : "", text);
116 }
117
ff_ass_add_rect(AVSubtitle * sub,const char * dialog,int readorder,int layer,const char * style,const char * speaker)118 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
119 int readorder, int layer, const char *style,
120 const char *speaker)
121 {
122 char *ass_str;
123 AVSubtitleRect **rects;
124
125 rects = av_realloc_array(sub->rects, sub->num_rects+1, sizeof(*sub->rects));
126 if (!rects)
127 return AVERROR(ENOMEM);
128 sub->rects = rects;
129 rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
130 if (!rects[sub->num_rects])
131 return AVERROR(ENOMEM);
132 rects[sub->num_rects]->type = SUBTITLE_ASS;
133 ass_str = ff_ass_get_dialog(readorder, layer, style, speaker, dialog);
134 if (!ass_str)
135 return AVERROR(ENOMEM);
136 rects[sub->num_rects]->ass = ass_str;
137 sub->num_rects++;
138 return 0;
139 }
140
ff_ass_decoder_flush(AVCodecContext * avctx)141 void ff_ass_decoder_flush(AVCodecContext *avctx)
142 {
143 FFASSDecoderContext *s = avctx->priv_data;
144 if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
145 s->readorder = 0;
146 }
147
ff_ass_bprint_text_event(AVBPrint * buf,const char * p,int size,const char * linebreaks,int keep_ass_markup)148 void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
149 const char *linebreaks, int keep_ass_markup)
150 {
151 const char *p_end = p + size;
152
153 for (; p < p_end && *p; p++) {
154
155 /* forced custom line breaks, not accounted as "normal" EOL */
156 if (linebreaks && strchr(linebreaks, *p)) {
157 av_bprintf(buf, "\\N");
158
159 /* standard ASS escaping so random characters don't get mis-interpreted
160 * as ASS */
161 } else if (!keep_ass_markup && strchr("{}\\", *p)) {
162 av_bprintf(buf, "\\%c", *p);
163
164 /* some packets might end abruptly (no \0 at the end, like for example
165 * in some cases of demuxing from a classic video container), some
166 * might be terminated with \n or \r\n which we have to remove (for
167 * consistency with those who haven't), and we also have to deal with
168 * evil cases such as \r at the end of the buffer (and no \0 terminated
169 * character) */
170 } else if (p[0] == '\n') {
171 /* some stuff left so we can insert a line break */
172 if (p < p_end - 1)
173 av_bprintf(buf, "\\N");
174 } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
175 /* \r followed by a \n, we can skip it. We don't insert the \N yet
176 * because we don't know if it is followed by more text */
177 continue;
178
179 /* finally, a sane character */
180 } else {
181 av_bprint_chars(buf, *p, 1);
182 }
183 }
184 }
185