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2ba45a60 DM |
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 | ||
29 | int ff_ass_subtitle_header(AVCodecContext *avctx, | |
30 | const char *font, int font_size, | |
31 | int color, int back_color, | |
32 | int bold, int italic, int underline, | |
33 | int alignment) | |
34 | { | |
35 | avctx->subtitle_header = av_asprintf( | |
36 | "[Script Info]\r\n" | |
f6fa7814 | 37 | "; Script generated by FFmpeg/Lavc%s\r\n" |
2ba45a60 DM |
38 | "ScriptType: v4.00+\r\n" |
39 | "PlayResX: 384\r\n" | |
40 | "PlayResY: 288\r\n" | |
41 | "\r\n" | |
42 | "[V4+ Styles]\r\n" | |
f6fa7814 DM |
43 | |
44 | /* ASSv4 header */ | |
45 | "Format: Name, " | |
46 | "Fontname, Fontsize, " | |
47 | "PrimaryColour, SecondaryColour, OutlineColour, BackColour, " | |
48 | "Bold, Italic, Underline, StrikeOut, " | |
49 | "ScaleX, ScaleY, " | |
50 | "Spacing, Angle, " | |
51 | "BorderStyle, Outline, Shadow, " | |
52 | "Alignment, MarginL, MarginR, MarginV, " | |
53 | "Encoding\r\n" | |
54 | ||
55 | "Style: " | |
56 | "Default," /* Name */ | |
57 | "%s,%d," /* Font{name,size} */ | |
58 | "&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */ | |
59 | "%d,%d,%d,0," /* Bold, Italic, Underline, StrikeOut */ | |
60 | "100,100," /* Scale{X,Y} */ | |
61 | "0,0," /* Spacing, Angle */ | |
62 | "1,1,0," /* BorderStyle, Outline, Shadow */ | |
63 | "%d,10,10,10," /* Alignment, Margin[LRV] */ | |
64 | "0\r\n" /* Encoding */ | |
65 | ||
2ba45a60 DM |
66 | "\r\n" |
67 | "[Events]\r\n" | |
f6fa7814 DM |
68 | "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n", |
69 | !(avctx->flags & CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "", | |
2ba45a60 DM |
70 | font, font_size, color, color, back_color, back_color, |
71 | -bold, -italic, -underline, alignment); | |
72 | ||
73 | if (!avctx->subtitle_header) | |
74 | return AVERROR(ENOMEM); | |
75 | avctx->subtitle_header_size = strlen(avctx->subtitle_header); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | int ff_ass_subtitle_header_default(AVCodecContext *avctx) | |
80 | { | |
81 | return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT, | |
82 | ASS_DEFAULT_FONT_SIZE, | |
83 | ASS_DEFAULT_COLOR, | |
84 | ASS_DEFAULT_BACK_COLOR, | |
85 | ASS_DEFAULT_BOLD, | |
86 | ASS_DEFAULT_ITALIC, | |
87 | ASS_DEFAULT_UNDERLINE, | |
88 | ASS_DEFAULT_ALIGNMENT); | |
89 | } | |
90 | ||
91 | static void insert_ts(AVBPrint *buf, int ts) | |
92 | { | |
93 | if (ts == -1) { | |
94 | av_bprintf(buf, "9:59:59.99,"); | |
95 | } else { | |
96 | int h, m, s; | |
97 | ||
98 | h = ts/360000; ts -= 360000*h; | |
99 | m = ts/ 6000; ts -= 6000*m; | |
100 | s = ts/ 100; ts -= 100*s; | |
101 | av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts); | |
102 | } | |
103 | } | |
104 | ||
105 | int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog, | |
106 | int ts_start, int duration, int raw) | |
107 | { | |
108 | int dlen; | |
109 | ||
110 | if (!raw || raw == 2) { | |
111 | long int layer = 0; | |
112 | ||
113 | if (raw == 2) { | |
114 | /* skip ReadOrder */ | |
115 | dialog = strchr(dialog, ','); | |
116 | if (!dialog) | |
117 | return AVERROR_INVALIDDATA; | |
118 | dialog++; | |
119 | ||
120 | /* extract Layer or Marked */ | |
121 | layer = strtol(dialog, (char**)&dialog, 10); | |
122 | if (*dialog != ',') | |
123 | return AVERROR_INVALIDDATA; | |
124 | dialog++; | |
125 | } | |
126 | av_bprintf(buf, "Dialogue: %ld,", layer); | |
127 | insert_ts(buf, ts_start); | |
128 | insert_ts(buf, duration == -1 ? -1 : ts_start + duration); | |
129 | if (raw != 2) | |
f6fa7814 | 130 | av_bprintf(buf, "Default,,0,0,0,,"); |
2ba45a60 DM |
131 | } |
132 | ||
133 | dlen = strcspn(dialog, "\n"); | |
134 | dlen += dialog[dlen] == '\n'; | |
135 | ||
136 | av_bprintf(buf, "%.*s", dlen, dialog); | |
137 | if (raw == 2) | |
138 | av_bprintf(buf, "\r\n"); | |
139 | ||
140 | return dlen; | |
141 | } | |
142 | ||
143 | int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, | |
144 | int ts_start, int duration, int raw) | |
145 | { | |
146 | AVBPrint buf; | |
147 | int ret, dlen; | |
148 | AVSubtitleRect **rects; | |
149 | ||
150 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); | |
151 | if ((ret = ff_ass_bprint_dialog(&buf, dialog, ts_start, duration, raw)) < 0) | |
152 | goto err; | |
153 | dlen = ret; | |
154 | if (!av_bprint_is_complete(&buf)) | |
155 | goto errnomem; | |
156 | ||
157 | rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects)); | |
158 | if (!rects) | |
159 | goto errnomem; | |
160 | sub->rects = rects; | |
161 | sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration); | |
162 | rects[sub->num_rects] = av_mallocz(sizeof(*rects[0])); | |
163 | rects[sub->num_rects]->type = SUBTITLE_ASS; | |
164 | ret = av_bprint_finalize(&buf, &rects[sub->num_rects]->ass); | |
165 | if (ret < 0) | |
166 | goto err; | |
167 | sub->num_rects++; | |
168 | return dlen; | |
169 | ||
170 | errnomem: | |
171 | ret = AVERROR(ENOMEM); | |
172 | err: | |
173 | av_bprint_finalize(&buf, NULL); | |
174 | return ret; | |
175 | } | |
176 | ||
f6fa7814 DM |
177 | int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf, |
178 | int ts_start, int duration) | |
179 | { | |
180 | av_bprintf(buf, "\r\n"); | |
181 | if (!av_bprint_is_complete(buf)) | |
182 | return AVERROR(ENOMEM); | |
183 | return ff_ass_add_rect(sub, buf->str, ts_start, duration, 0); | |
184 | } | |
185 | ||
2ba45a60 DM |
186 | void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size, |
187 | const char *linebreaks, int keep_ass_markup) | |
188 | { | |
189 | const char *p_end = p + size; | |
190 | ||
191 | for (; p < p_end && *p; p++) { | |
192 | ||
193 | /* forced custom line breaks, not accounted as "normal" EOL */ | |
194 | if (linebreaks && strchr(linebreaks, *p)) { | |
195 | av_bprintf(buf, "\\N"); | |
196 | ||
197 | /* standard ASS escaping so random characters don't get mis-interpreted | |
198 | * as ASS */ | |
199 | } else if (!keep_ass_markup && strchr("{}\\", *p)) { | |
200 | av_bprintf(buf, "\\%c", *p); | |
201 | ||
202 | /* some packets might end abruptly (no \0 at the end, like for example | |
203 | * in some cases of demuxing from a classic video container), some | |
204 | * might be terminated with \n or \r\n which we have to remove (for | |
205 | * consistency with those who haven't), and we also have to deal with | |
206 | * evil cases such as \r at the end of the buffer (and no \0 terminated | |
207 | * character) */ | |
208 | } else if (p[0] == '\n') { | |
209 | /* some stuff left so we can insert a line break */ | |
210 | if (p < p_end - 1) | |
211 | av_bprintf(buf, "\\N"); | |
212 | } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') { | |
213 | /* \r followed by a \n, we can skip it. We don't insert the \N yet | |
214 | * because we don't know if it is followed by more text */ | |
215 | continue; | |
216 | ||
217 | /* finally, a sane character */ | |
218 | } else { | |
219 | av_bprint_chars(buf, *p, 1); | |
220 | } | |
221 | } | |
2ba45a60 | 222 | } |