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/*
* SSA/ASS common functions
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
#include "ass.h"
#include "libavutil/avstring.h"
#include "libavutil/common.h"
/**
* Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
*
* @param avctx pointer to the AVCodecContext
* @param font name of the default font face to use
* @param font_size default font size to use
* @param color default text color to use (ABGR)
* @param back_color default background color to use (ABGR)
* @param bold 1 for bold text, 0 for normal text
* @param italic 1 for italic text, 0 for normal text
* @param underline 1 for underline text, 0 for normal text
* @param alignment position of the text (left, center, top...), defined after
* the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
* @return >= 0 on success otherwise an error code <0
*/
static int ass_subtitle_header(AVCodecContext *avctx,
const char *font, int font_size,
int color, int back_color,
int bold, int italic, int underline,
int alignment)
{
char header[512];
snprintf(header, sizeof(header),
"[Script Info]\r\n"
"ScriptType: v4.00+\r\n"
"\r\n"
"[V4+ Styles]\r\n"
"Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
"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"
"\r\n"
"[Events]\r\n"
"Format: Layer, Start, End, Text\r\n",
font, font_size, color, color, back_color, back_color,
-bold, -italic, -underline, alignment);
avctx->subtitle_header = av_strdup(header);
if (!avctx->subtitle_header)
return AVERROR(ENOMEM);
avctx->subtitle_header_size = strlen(avctx->subtitle_header);
return 0;
}
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
{
return ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
ASS_DEFAULT_FONT_SIZE,
ASS_DEFAULT_COLOR,
ASS_DEFAULT_BACK_COLOR,
ASS_DEFAULT_BOLD,
ASS_DEFAULT_ITALIC,
ASS_DEFAULT_UNDERLINE,
ASS_DEFAULT_ALIGNMENT);
}
void ff_ass_init(AVSubtitle *sub)
{
memset(sub, 0, sizeof(*sub));
}
static int ts_to_string(char *str, int strlen, int ts)
{
int h, m, s;
h = ts/360000; ts -= 360000*h;
m = ts/ 6000; ts -= 6000*m;
s = ts/ 100; ts -= 100*s;
return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
}
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int ts_start, int ts_end, int raw)
{
int len = 0, dlen, duration = ts_end - ts_start;
char s_start[16], s_end[16], header[48] = {0};
AVSubtitleRect **rects;
if (!raw) {
ts_to_string(s_start, sizeof(s_start), ts_start);
ts_to_string(s_end, sizeof(s_end), ts_end );
len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
s_start, s_end);
}
dlen = strcspn(dialog, "\n");
dlen += dialog[dlen] == '\n';
rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
if (!rects)
return AVERROR(ENOMEM);
sub->rects = rects;
sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
rects[sub->num_rects]->type = SUBTITLE_ASS;
rects[sub->num_rects]->ass = av_malloc(len + dlen + 1);
strcpy (rects[sub->num_rects]->ass , header);
av_strlcpy(rects[sub->num_rects]->ass + len, dialog, dlen + 1);
sub->num_rects++;
return dlen;
}
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