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/avstring.h"
25 #include "libavutil/bprint.h"
26 #include "libavutil/common.h"
27
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)28 int ff_ass_subtitle_header_full(AVCodecContext *avctx,
29 int play_res_x, int play_res_y,
30 const char *font, int font_size,
31 int primary_color, int secondary_color,
32 int outline_color, int back_color,
33 int bold, int italic, int underline,
34 int border_style, int alignment)
35 {
36 avctx->subtitle_header = av_asprintf(
37 "[Script Info]\r\n"
38 "; Script generated by FFmpeg/Lavc%s\r\n"
39 "ScriptType: v4.00+\r\n"
40 "PlayResX: %d\r\n"
41 "PlayResY: %d\r\n"
42 "ScaledBorderAndShadow: yes\r\n"
43 "\r\n"
44 "[V4+ Styles]\r\n"
45
46 /* ASSv4 header */
47 "Format: Name, "
48 "Fontname, Fontsize, "
49 "PrimaryColour, SecondaryColour, OutlineColour, BackColour, "
50 "Bold, Italic, Underline, StrikeOut, "
51 "ScaleX, ScaleY, "
52 "Spacing, Angle, "
53 "BorderStyle, Outline, Shadow, "
54 "Alignment, MarginL, MarginR, MarginV, "
55 "Encoding\r\n"
56
57 "Style: "
58 "Default," /* Name */
59 "%s,%d," /* Font{name,size} */
60 "&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */
61 "%d,%d,%d,0," /* Bold, Italic, Underline, StrikeOut */
62 "100,100," /* Scale{X,Y} */
63 "0,0," /* Spacing, Angle */
64 "%d,1,0," /* BorderStyle, Outline, Shadow */
65 "%d,10,10,10," /* Alignment, Margin[LRV] */
66 "0\r\n" /* Encoding */
67
68 "\r\n"
69 "[Events]\r\n"
70 "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
71 !(avctx->flags & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "",
72 play_res_x, play_res_y, font, font_size,
73 primary_color, secondary_color, outline_color, back_color,
74 -bold, -italic, -underline, border_style, alignment);
75
76 if (!avctx->subtitle_header)
77 return AVERROR(ENOMEM);
78 avctx->subtitle_header_size = strlen(avctx->subtitle_header);
79 return 0;
80 }
81
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)82 int ff_ass_subtitle_header(AVCodecContext *avctx,
83 const char *font, int font_size,
84 int color, int back_color,
85 int bold, int italic, int underline,
86 int border_style, int alignment)
87 {
88 return ff_ass_subtitle_header_full(avctx,
89 ASS_DEFAULT_PLAYRESX, ASS_DEFAULT_PLAYRESY,
90 font, font_size, color, color,
91 back_color, back_color,
92 bold, italic, underline,
93 border_style, alignment);
94 }
95
ff_ass_subtitle_header_default(AVCodecContext * avctx)96 int ff_ass_subtitle_header_default(AVCodecContext *avctx)
97 {
98 return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
99 ASS_DEFAULT_FONT_SIZE,
100 ASS_DEFAULT_COLOR,
101 ASS_DEFAULT_BACK_COLOR,
102 ASS_DEFAULT_BOLD,
103 ASS_DEFAULT_ITALIC,
104 ASS_DEFAULT_UNDERLINE,
105 ASS_DEFAULT_BORDERSTYLE,
106 ASS_DEFAULT_ALIGNMENT);
107 }
108
ff_ass_get_dialog(int readorder,int layer,const char * style,const char * speaker,const char * text)109 char *ff_ass_get_dialog(int readorder, int layer, const char *style,
110 const char *speaker, const char *text)
111 {
112 return av_asprintf("%d,%d,%s,%s,0,0,0,,%s",
113 readorder, layer, style ? style : "Default",
114 speaker ? speaker : "", text);
115 }
116
ff_ass_add_rect2(AVSubtitle * sub,const char * dialog,int readorder,int layer,const char * style,const char * speaker,unsigned * nb_rect_allocated)117 int ff_ass_add_rect2(AVSubtitle *sub, const char *dialog,
118 int readorder, int layer, const char *style,
119 const char *speaker, unsigned *nb_rect_allocated)
120 {
121 AVSubtitleRect **rects = sub->rects, *rect;
122 char *ass_str;
123 uint64_t new_nb = 0;
124
125 if (sub->num_rects >= UINT_MAX)
126 return AVERROR(ENOMEM);
127
128 if (nb_rect_allocated && *nb_rect_allocated <= sub->num_rects) {
129 if (sub->num_rects < UINT_MAX / 17 * 16) {
130 new_nb = sub->num_rects + sub->num_rects/16 + 1;
131 } else
132 new_nb = UINT_MAX;
133 } else if (!nb_rect_allocated)
134 new_nb = sub->num_rects + 1;
135
136 if (new_nb) {
137 rects = av_realloc_array(rects, new_nb, sizeof(*sub->rects));
138 if (!rects)
139 return AVERROR(ENOMEM);
140 if (nb_rect_allocated)
141 *nb_rect_allocated = new_nb;
142 sub->rects = rects;
143 }
144
145 rect = av_mallocz(sizeof(*rect));
146 if (!rect)
147 return AVERROR(ENOMEM);
148 rects[sub->num_rects++] = rect;
149 rect->type = SUBTITLE_ASS;
150 ass_str = ff_ass_get_dialog(readorder, layer, style, speaker, dialog);
151 if (!ass_str)
152 return AVERROR(ENOMEM);
153 rect->ass = ass_str;
154 return 0;
155 }
156
ff_ass_add_rect(AVSubtitle * sub,const char * dialog,int readorder,int layer,const char * style,const char * speaker)157 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
158 int readorder, int layer, const char *style,
159 const char *speaker)
160 {
161 return ff_ass_add_rect2(sub, dialog, readorder, layer, style, speaker, NULL);
162 }
163
ff_ass_decoder_flush(AVCodecContext * avctx)164 void ff_ass_decoder_flush(AVCodecContext *avctx)
165 {
166 FFASSDecoderContext *s = avctx->priv_data;
167 if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
168 s->readorder = 0;
169 }
170
ff_ass_bprint_text_event(AVBPrint * buf,const char * p,int size,const char * linebreaks,int keep_ass_markup)171 void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
172 const char *linebreaks, int keep_ass_markup)
173 {
174 const char *p_end = p + size;
175
176 for (; p < p_end && *p; p++) {
177
178 /* forced custom line breaks, not accounted as "normal" EOL */
179 if (linebreaks && strchr(linebreaks, *p)) {
180 av_bprintf(buf, "\\N");
181
182 /* standard ASS escaping so random characters don't get mis-interpreted
183 * as ASS */
184 } else if (!keep_ass_markup && strchr("{}\\", *p)) {
185 av_bprintf(buf, "\\%c", *p);
186
187 /* some packets might end abruptly (no \0 at the end, like for example
188 * in some cases of demuxing from a classic video container), some
189 * might be terminated with \n or \r\n which we have to remove (for
190 * consistency with those who haven't), and we also have to deal with
191 * evil cases such as \r at the end of the buffer (and no \0 terminated
192 * character) */
193 } else if (p[0] == '\n') {
194 /* some stuff left so we can insert a line break */
195 if (p < p_end - 1)
196 av_bprintf(buf, "\\N");
197 } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
198 /* \r followed by a \n, we can skip it. We don't insert the \N yet
199 * because we don't know if it is followed by more text */
200 continue;
201
202 /* finally, a sane character */
203 } else {
204 av_bprint_chars(buf, *p, 1);
205 }
206 }
207 }
208