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libavcodec/ass.c

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00001 /*
00002  * SSA/ASS common funtions
00003  * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "avcodec.h"
00023 #include "ass.h"
00024 #include "libavutil/avstring.h"
00025 
00041 static int ff_ass_subtitle_header(AVCodecContext *avctx,
00042                                   const char *font, int font_size,
00043                                   int color, int back_color,
00044                                   int bold, int italic, int underline,
00045                                   int alignment)
00046 {
00047     char header[512];
00048 
00049     snprintf(header, sizeof(header),
00050              "[Script Info]\r\n"
00051              "ScriptType: v4.00+\r\n"
00052              "\r\n"
00053              "[V4+ Styles]\r\n"
00054              "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
00055              "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"
00056              "\r\n"
00057              "[Events]\r\n"
00058              "Format: Layer, Start, End, Text\r\n",
00059              font, font_size, color, color, back_color, back_color,
00060              -bold, -italic, -underline, alignment);
00061 
00062     avctx->subtitle_header = av_strdup(header);
00063     if (!avctx->subtitle_header)
00064         return AVERROR(ENOMEM);
00065     avctx->subtitle_header_size = strlen(avctx->subtitle_header);
00066     return 0;
00067 }
00068 
00069 int ff_ass_subtitle_header_default(AVCodecContext *avctx)
00070 {
00071     return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
00072                                          ASS_DEFAULT_FONT_SIZE,
00073                                          ASS_DEFAULT_COLOR,
00074                                          ASS_DEFAULT_BACK_COLOR,
00075                                          ASS_DEFAULT_BOLD,
00076                                          ASS_DEFAULT_ITALIC,
00077                                          ASS_DEFAULT_UNDERLINE,
00078                                          ASS_DEFAULT_ALIGNMENT);
00079 }
00080 
00081 void ff_ass_init(AVSubtitle *sub)
00082 {
00083     memset(sub, 0, sizeof(*sub));
00084 }
00085 
00086 static int ts_to_string(char *str, int strlen, int ts)
00087 {
00088     int h, m, s;
00089     h = ts/360000;  ts -= 360000*h;
00090     m = ts/  6000;  ts -=   6000*m;
00091     s = ts/   100;  ts -=    100*s;
00092     return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
00093 }
00094 
00095 int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
00096                     int ts_start, int ts_end, int raw)
00097 {
00098     int len = 0, dlen, duration = ts_end - ts_start;
00099     char s_start[16], s_end[16], header[48] = {0};
00100     AVSubtitleRect **rects;
00101 
00102     if (!raw) {
00103         ts_to_string(s_start, sizeof(s_start), ts_start);
00104         ts_to_string(s_end,   sizeof(s_end),   ts_end  );
00105         len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
00106                        s_start, s_end);
00107     }
00108 
00109     dlen = strcspn(dialog, "\n");
00110     dlen += dialog[dlen] == '\n';
00111 
00112     rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
00113     if (!rects)
00114         return AVERROR(ENOMEM);
00115     sub->rects = rects;
00116     sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
00117     rects[sub->num_rects]       = av_mallocz(sizeof(*rects[0]));
00118     rects[sub->num_rects]->type = SUBTITLE_ASS;
00119     rects[sub->num_rects]->ass  = av_malloc(len + dlen + 1);
00120     strcpy (rects[sub->num_rects]->ass      , header);
00121     av_strlcpy(rects[sub->num_rects]->ass + len, dialog, dlen + 1);
00122     sub->num_rects++;
00123     return dlen;
00124 }
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