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/*
* Copyright (c) 2012 Clément Bœsch
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* RealText subtitle decoder
* @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
*/
#include "avcodec.h"
#include "ass.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
static int rt_event_to_ass(AVBPrint *buf, const char *p)
{
int prev_chr_is_space = 1;
while (*p) {
if (*p != '<') {
if (!av_isspace(*p))
av_bprint_chars(buf, *p, 1);
else if (!prev_chr_is_space)
av_bprint_chars(buf, ' ', 1);
prev_chr_is_space = av_isspace(*p);
} else {
const char *end = strchr(p, '>');
if (!end)
break;
if (!av_strncasecmp(p, "<br/>", 5) ||
!av_strncasecmp(p, "<br>", 4)) {
av_bprintf(buf, "\\N");
}
p = end;
}
p++;
}
return 0;
}
static int realtext_decode_frame(AVCodecContext *avctx,
void *data, int *got_sub_ptr, AVPacket *avpkt)
{
int ret = 0;
AVSubtitle *sub = data;
const char *ptr = avpkt->data;
AVBPrint buf;
av_bprint_init(&buf, 0, 4096);
// note: no need to rescale pts & duration since they are in the same
// timebase as ASS (1/100)
if (ptr && avpkt->size > 0 && !rt_event_to_ass(&buf, ptr))
ret = ff_ass_add_rect_bprint(sub, &buf, avpkt->pts, avpkt->duration);
av_bprint_finalize(&buf, NULL);
if (ret < 0)
return ret;
*got_sub_ptr = sub->num_rects > 0;
return avpkt->size;
}
AVCodec ff_realtext_decoder = {
.name = "realtext",
.long_name = NULL_IF_CONFIG_SMALL("RealText subtitle"),
.type = AVMEDIA_TYPE_SUBTITLE,
.id = AV_CODEC_ID_REALTEXT,
.decode = realtext_decode_frame,
.init = ff_ass_subtitle_header_default,
};
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