/*
* 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 demuxer
* @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
*/
#include "avformat.h"
#include "internal.h"
#include "subtitles.h"
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/intreadwrite.h"
typedef struct {
FFDemuxSubtitlesQueue q;
} RealTextContext;
static int realtext_probe(AVProbeData *p)
{
const unsigned char *ptr = p->buf;
if (AV_RB24(ptr) == 0xEFBBBF)
ptr += 3; /* skip UTF-8 BOM */
return !av_strncasecmp(ptr, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0;
}
static int read_ts(const char *s)
{
int hh, mm, ss, ms;
if (sscanf(s
, "%u:%u:%u.%u", &hh
, &mm
, &ss
, &ms
) == 4) return (hh
*3600 + mm
*60 + ss
) * 100 + ms
; if (sscanf(s
, "%u:%u:%u" , &hh
, &mm
, &ss
) == 3) return (hh
*3600 + mm
*60 + ss
) * 100; if (sscanf(s
, "%u:%u.%u", &mm
, &ss
, &ms
) == 3) return ( mm
*60 + ss
) * 100 + ms
; if (sscanf(s
, "%u:%u" , &mm
, &ss
) == 2) return ( mm
*60 + ss
) * 100; if (sscanf(s
, "%u.%u", &ss
, &ms
) == 2) return ( ss
) * 100 + ms
; return strtol(s
, NULL
, 10) * 100; }
static int realtext_read_header(AVFormatContext *s)
{
RealTextContext *rt = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
AVBPrint buf;
char c = 0;
int res = 0, duration = read_ts("60"); // default duration is 60 seconds
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 100);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = AV_CODEC_ID_REALTEXT;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
while (!url_feof(s->pb)) {
AVPacket *sub;
const int64_t pos = avio_tell(s->pb) - (c != 0);
int n = ff_smil_extract_next_chunk(s->pb, &buf, &c);
if (n == 0)
break;
if (!av_strncasecmp(buf.str, "<window", 7)) {
/* save header to extradata */
const char *p = ff_smil_get_attr_ptr(buf.str, "duration");
if (p)
duration = read_ts(p);
st->codec->extradata = av_strdup(buf.str);
if (!st->codec->extradata) {
res = AVERROR(ENOMEM);
goto end;
}
st->codec->extradata_size = buf.len + 1;
} else {
/* if we just read a <time> tag, introduce a new event, otherwise merge
* with the previous one */
int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1;
sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge);
if (!sub) {
res = AVERROR(ENOMEM);
goto end;
}
if (!merge) {
const char *begin = ff_smil_get_attr_ptr(buf.str, "begin");
const char *end = ff_smil_get_attr_ptr(buf.str, "end");
sub->pos = pos;
sub->pts = begin ? read_ts(begin) : 0;
sub->duration = end ? (read_ts(end) - sub->pts) : duration;
}
}
av_bprint_clear(&buf);
}
ff_subtitles_queue_finalize(&rt->q);
end:
av_bprint_finalize(&buf, NULL);
return res;
}
static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt)
{
RealTextContext *rt = s->priv_data;
return ff_subtitles_queue_read_packet(&rt->q, pkt);
}
static int realtext_read_seek(AVFormatContext *s, int stream_index,
int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
{
RealTextContext *rt = s->priv_data;
return ff_subtitles_queue_seek(&rt->q, s, stream_index,
min_ts, ts, max_ts, flags);
}
static int realtext_read_close(AVFormatContext *s)
{
RealTextContext *rt = s->priv_data;
ff_subtitles_queue_clean(&rt->q);
return 0;
}
AVInputFormat ff_realtext_demuxer = {
.name = "realtext",
.long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"),
.priv_data_size = sizeof(RealTextContext),
.read_probe = realtext_probe,
.read_header = realtext_read_header,
.read_packet = realtext_read_packet,
.read_seek2 = realtext_read_seek,
.read_close = realtext_read_close,
.extensions = "rt",
};