blob: b4f081c819e4098fd3c229d80632989a96ad9d0f
| 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 border_style, 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: %d\r\n" |
| 40 | "PlayResY: %d\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 | "%d,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 & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "", |
| 70 | ASS_DEFAULT_PLAYRESX, ASS_DEFAULT_PLAYRESY, |
| 71 | font, font_size, color, color, back_color, back_color, |
| 72 | -bold, -italic, -underline, border_style, alignment); |
| 73 | |
| 74 | if (!avctx->subtitle_header) |
| 75 | return AVERROR(ENOMEM); |
| 76 | avctx->subtitle_header_size = strlen(avctx->subtitle_header); |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | int ff_ass_subtitle_header_default(AVCodecContext *avctx) |
| 81 | { |
| 82 | return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT, |
| 83 | ASS_DEFAULT_FONT_SIZE, |
| 84 | ASS_DEFAULT_COLOR, |
| 85 | ASS_DEFAULT_BACK_COLOR, |
| 86 | ASS_DEFAULT_BOLD, |
| 87 | ASS_DEFAULT_ITALIC, |
| 88 | ASS_DEFAULT_UNDERLINE, |
| 89 | ASS_DEFAULT_BORDERSTYLE, |
| 90 | ASS_DEFAULT_ALIGNMENT); |
| 91 | } |
| 92 | |
| 93 | char *ff_ass_get_dialog(int readorder, int layer, const char *style, |
| 94 | const char *speaker, const char *text) |
| 95 | { |
| 96 | return av_asprintf("%d,%d,%s,%s,0,0,0,,%s", |
| 97 | readorder, layer, style ? style : "Default", |
| 98 | speaker ? speaker : "", text); |
| 99 | } |
| 100 | |
| 101 | int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, |
| 102 | int readorder, int layer, const char *style, |
| 103 | const char *speaker) |
| 104 | { |
| 105 | char *ass_str; |
| 106 | AVSubtitleRect **rects; |
| 107 | |
| 108 | rects = av_realloc_array(sub->rects, (sub->num_rects+1), sizeof(*sub->rects)); |
| 109 | if (!rects) |
| 110 | return AVERROR(ENOMEM); |
| 111 | sub->rects = rects; |
| 112 | rects[sub->num_rects] = av_mallocz(sizeof(*rects[0])); |
| 113 | if (!rects[sub->num_rects]) |
| 114 | return AVERROR(ENOMEM); |
| 115 | rects[sub->num_rects]->type = SUBTITLE_ASS; |
| 116 | ass_str = ff_ass_get_dialog(readorder, layer, style, speaker, dialog); |
| 117 | if (!ass_str) |
| 118 | return AVERROR(ENOMEM); |
| 119 | rects[sub->num_rects]->ass = ass_str; |
| 120 | sub->num_rects++; |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | void ff_ass_decoder_flush(AVCodecContext *avctx) |
| 125 | { |
| 126 | FFASSDecoderContext *s = avctx->priv_data; |
| 127 | if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP)) |
| 128 | s->readorder = 0; |
| 129 | } |
| 130 | |
| 131 | void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size, |
| 132 | const char *linebreaks, int keep_ass_markup) |
| 133 | { |
| 134 | const char *p_end = p + size; |
| 135 | |
| 136 | for (; p < p_end && *p; p++) { |
| 137 | |
| 138 | /* forced custom line breaks, not accounted as "normal" EOL */ |
| 139 | if (linebreaks && strchr(linebreaks, *p)) { |
| 140 | av_bprintf(buf, "\\N"); |
| 141 | |
| 142 | /* standard ASS escaping so random characters don't get mis-interpreted |
| 143 | * as ASS */ |
| 144 | } else if (!keep_ass_markup && strchr("{}\\", *p)) { |
| 145 | av_bprintf(buf, "\\%c", *p); |
| 146 | |
| 147 | /* some packets might end abruptly (no \0 at the end, like for example |
| 148 | * in some cases of demuxing from a classic video container), some |
| 149 | * might be terminated with \n or \r\n which we have to remove (for |
| 150 | * consistency with those who haven't), and we also have to deal with |
| 151 | * evil cases such as \r at the end of the buffer (and no \0 terminated |
| 152 | * character) */ |
| 153 | } else if (p[0] == '\n') { |
| 154 | /* some stuff left so we can insert a line break */ |
| 155 | if (p < p_end - 1) |
| 156 | av_bprintf(buf, "\\N"); |
| 157 | } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') { |
| 158 | /* \r followed by a \n, we can skip it. We don't insert the \N yet |
| 159 | * because we don't know if it is followed by more text */ |
| 160 | continue; |
| 161 | |
| 162 | /* finally, a sane character */ |
| 163 | } else { |
| 164 | av_bprint_chars(buf, *p, 1); |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 |