1/* 2 * SSA/ASS common funtions 3 * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 26/** 27 * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS. 28 * 29 * @param avctx pointer to the AVCodecContext 30 * @param font name of the default font face to use 31 * @param font_size default font size to use 32 * @param color default text color to use (ABGR) 33 * @param back_color default background color to use (ABGR) 34 * @param bold 1 for bold text, 0 for normal text 35 * @param italic 1 for italic text, 0 for normal text 36 * @param underline 1 for underline text, 0 for normal text 37 * @param alignment position of the text (left, center, top...), defined after 38 * the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top) 39 * @return >= 0 on success otherwise an error code <0 40 */ 41static int ff_ass_subtitle_header(AVCodecContext *avctx, 42 const char *font, int font_size, 43 int color, int back_color, 44 int bold, int italic, int underline, 45 int alignment) 46{ 47 char header[512]; 48 49 snprintf(header, sizeof(header), 50 "[Script Info]\r\n" 51 "ScriptType: v4.00+\r\n" 52 "\r\n" 53 "[V4+ Styles]\r\n" 54 "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n" 55 "Style: Default,%s,%d,&H%x,&H%x,&H%x,&H%x,%d,%d,%d,1,1,0,%d,10,10,10,0,0\r\n" 56 "\r\n" 57 "[Events]\r\n" 58 "Format: Layer, Start, End, Text\r\n", 59 font, font_size, color, color, back_color, back_color, 60 -bold, -italic, -underline, alignment); 61 62 avctx->subtitle_header = av_strdup(header); 63 if (!avctx->subtitle_header) 64 return AVERROR(ENOMEM); 65 avctx->subtitle_header_size = strlen(avctx->subtitle_header); 66 return 0; 67} 68 69int ff_ass_subtitle_header_default(AVCodecContext *avctx) 70{ 71 return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT, 72 ASS_DEFAULT_FONT_SIZE, 73 ASS_DEFAULT_COLOR, 74 ASS_DEFAULT_BACK_COLOR, 75 ASS_DEFAULT_BOLD, 76 ASS_DEFAULT_ITALIC, 77 ASS_DEFAULT_UNDERLINE, 78 ASS_DEFAULT_ALIGNMENT); 79} 80 81void ff_ass_init(AVSubtitle *sub) 82{ 83 memset(sub, 0, sizeof(*sub)); 84} 85 86static int ts_to_string(char *str, int strlen, int ts) 87{ 88 int h, m, s; 89 h = ts/360000; ts -= 360000*h; 90 m = ts/ 6000; ts -= 6000*m; 91 s = ts/ 100; ts -= 100*s; 92 return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts); 93} 94 95int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, 96 int ts_start, int ts_end, int raw) 97{ 98 int len = 0, dlen, duration = ts_end - ts_start; 99 char s_start[16], s_end[16], header[48] = {0}; 100 AVSubtitleRect **rects; 101 102 if (!raw) { 103 ts_to_string(s_start, sizeof(s_start), ts_start); 104 ts_to_string(s_end, sizeof(s_end), ts_end ); 105 len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,", 106 s_start, s_end); 107 } 108 109 dlen = strcspn(dialog, "\n"); 110 dlen += dialog[dlen] == '\n'; 111 112 rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects)); 113 if (!rects) 114 return AVERROR(ENOMEM); 115 sub->rects = rects; 116 sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration); 117 rects[sub->num_rects] = av_mallocz(sizeof(*rects[0])); 118 rects[sub->num_rects]->type = SUBTITLE_ASS; 119 rects[sub->num_rects]->ass = av_malloc(len + dlen + 1); 120 strcpy (rects[sub->num_rects]->ass , header); 121 av_strlcpy(rects[sub->num_rects]->ass + len, dialog, dlen + 1); 122 sub->num_rects++; 123 return dlen; 124} 125