| 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" |
| 37 | "; Script generated by FFmpeg/Lavc%s\r\n" |
| 38 | "ScriptType: v4.00+\r\n" |
| 39 | "PlayResX: 384\r\n" |
| 40 | "PlayResY: 288\r\n" |
| 41 | "\r\n" |
| 42 | "[V4+ Styles]\r\n" |
| 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 | |
| 66 | "\r\n" |
| 67 | "[Events]\r\n" |
| 68 | "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n", |
| 69 | !(avctx->flags & CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "", |
| 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) |
| 130 | av_bprintf(buf, "Default,,0,0,0,,"); |
| 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 | |
| 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 | |
| 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 | } |
| 222 | } |