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4349 Serge 1 
/*
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 * Copyright (c) 2012 Clément Bœsch
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * RealText subtitle demuxer
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 * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm
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 */
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#include "avformat.h"
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#include "internal.h"
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#include "subtitles.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/intreadwrite.h"
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typedef struct {
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    FFDemuxSubtitlesQueue q;
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} RealTextContext;
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static int realtext_probe(AVProbeData *p)
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{
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    const unsigned char *ptr = p->buf;
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    if (AV_RB24(ptr) == 0xEFBBBF)
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        ptr += 3;  /* skip UTF-8 BOM */
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    return !av_strncasecmp(ptr, "
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}
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static int read_ts(const char *s)
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{
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    int hh, mm, ss, ms;
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    if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600 + mm*60 + ss) * 100 + ms;
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    if (sscanf(s, "%u:%u:%u"   , &hh, &mm, &ss     ) == 3) return (hh*3600 + mm*60 + ss) * 100;
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    if (sscanf(s,    "%u:%u.%u",      &mm, &ss, &ms) == 3) return (          mm*60 + ss) * 100 + ms;
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    if (sscanf(s,    "%u:%u"   ,      &mm, &ss     ) == 2) return (          mm*60 + ss) * 100;
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    if (sscanf(s,       "%u.%u",           &ss, &ms) == 2) return (                  ss) * 100 + ms;
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    return strtol(s, NULL, 10) * 100;
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}
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static int realtext_read_header(AVFormatContext *s)
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{
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    RealTextContext *rt = s->priv_data;
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    AVStream *st = avformat_new_stream(s, NULL);
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    AVBPrint buf;
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    char c = 0;
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    int res = 0, duration = read_ts("60"); // default duration is 60 seconds
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    if (!st)
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        return AVERROR(ENOMEM);
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    avpriv_set_pts_info(st, 64, 1, 100);
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    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
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    st->codec->codec_id   = AV_CODEC_ID_REALTEXT;
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    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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    while (!url_feof(s->pb)) {
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        AVPacket *sub;
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        const int64_t pos = avio_tell(s->pb) - (c != 0);
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        int n = ff_smil_extract_next_chunk(s->pb, &buf, &c);
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        if (n == 0)
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            break;
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        if (!av_strncasecmp(buf.str, "
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            /* save header to extradata */
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            const char *p = ff_smil_get_attr_ptr(buf.str, "duration");
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            if (p)
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                duration = read_ts(p);
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            st->codec->extradata = av_strdup(buf.str);
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            if (!st->codec->extradata) {
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                res = AVERROR(ENOMEM);
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                goto end;
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            }
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            st->codec->extradata_size = buf.len + 1;
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        } else {
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            /* if we just read a
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             * with the previous one */
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            int merge = !av_strncasecmp(buf.str, "
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            sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge);
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            if (!sub) {
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                res = AVERROR(ENOMEM);
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                goto end;
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            }
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            if (!merge) {
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                const char *begin = ff_smil_get_attr_ptr(buf.str, "begin");
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                const char *end   = ff_smil_get_attr_ptr(buf.str, "end");
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                sub->pos      = pos;
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                sub->pts      = begin ? read_ts(begin) : 0;
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                sub->duration = end ? (read_ts(end) - sub->pts) : duration;
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            }
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        }
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        av_bprint_clear(&buf);
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    }
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    ff_subtitles_queue_finalize(&rt->q);
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117 
end:
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    av_bprint_finalize(&buf, NULL);
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    return res;
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}
121 
 
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static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    RealTextContext *rt = s->priv_data;
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    return ff_subtitles_queue_read_packet(&rt->q, pkt);
126 
}
127 
 
128 
static int realtext_read_seek(AVFormatContext *s, int stream_index,
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                             int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
130 
{
131 
    RealTextContext *rt = s->priv_data;
132 
    return ff_subtitles_queue_seek(&rt->q, s, stream_index,
133 
                                   min_ts, ts, max_ts, flags);
134 
}
135 
 
136 
static int realtext_read_close(AVFormatContext *s)
137 
{
138 
    RealTextContext *rt = s->priv_data;
139 
    ff_subtitles_queue_clean(&rt->q);
140 
    return 0;
141 
}
142 
 
143 
AVInputFormat ff_realtext_demuxer = {
144 
    .name           = "realtext",
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    .long_name      = NULL_IF_CONFIG_SMALL("RealText subtitle format"),
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    .priv_data_size = sizeof(RealTextContext),
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    .read_probe     = realtext_probe,
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    .read_header    = realtext_read_header,
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    .read_packet    = realtext_read_packet,
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    .read_seek2     = realtext_read_seek,
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    .read_close     = realtext_read_close,
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    .extensions     = "rt",
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};