142 lines
4.8 KiB
C
142 lines
4.8 KiB
C
/*
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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(const AVProbeData *p)
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{
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char buf[7];
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FFTextReader tr;
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ff_text_init_buf(&tr, p->buf, p->buf_size);
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ff_text_read(&tr, buf, sizeof(buf));
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return !av_strncasecmp(buf, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0;
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}
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static int64_t 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*3600LL + mm*60LL + ss) * 100LL + ms;
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if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600LL + mm*60LL + ss) * 100LL;
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if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60LL + ss) * 100LL + ms;
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if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60LL + ss) * 100LL;
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if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100LL + ms;
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return strtoll(s, NULL, 10) * 100ULL;
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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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FFTextReader tr;
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ff_text_init_avio(s, &tr, s->pb);
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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->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
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st->codecpar->codec_id = AV_CODEC_ID_REALTEXT;
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
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while (!ff_text_eof(&tr)) {
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AVPacket *sub;
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const int64_t pos = ff_text_pos(&tr) - (c != 0);
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int n = ff_smil_extract_next_text_chunk(&tr, &buf, &c);
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if (n == 0)
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break;
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if (!av_strncasecmp(buf.str, "<window", 7)) {
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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 (st->codecpar->extradata) {
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res = AVERROR_INVALIDDATA;
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goto end;
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}
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if (p)
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duration = read_ts(p);
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st->codecpar->extradata = av_strdup(buf.str);
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if (!st->codecpar->extradata) {
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res = AVERROR(ENOMEM);
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goto end;
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}
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st->codecpar->extradata_size = buf.len + 1;
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} else {
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/* if we just read a <time> tag, introduce a new event, otherwise merge
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* with the previous one */
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int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1;
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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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int64_t endi = end ? read_ts(end) : 0;
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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 && endi > sub->pts && endi - (uint64_t)sub->pts <= INT64_MAX) ? endi - 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(s, &rt->q);
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end:
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av_bprint_finalize(&buf, NULL);
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return res;
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}
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const AVInputFormat ff_realtext_demuxer = {
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.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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.flags_internal = FF_FMT_INIT_CLEANUP,
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.read_probe = realtext_probe,
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.read_header = realtext_read_header,
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.extensions = "rt",
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.read_packet = ff_subtitles_read_packet,
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.read_seek2 = ff_subtitles_read_seek,
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.read_close = ff_subtitles_read_close,
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};
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