/* * 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(const AVProbeData *p) { char buf[7]; FFTextReader tr; ff_text_init_buf(&tr, p->buf, p->buf_size); ff_text_read(&tr, buf, sizeof(buf)); return !av_strncasecmp(buf, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0; } static int64_t read_ts(const char *s) { int hh, mm, ss, ms; if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600LL + mm*60LL + ss) * 100LL + ms; if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600LL + mm*60LL + ss) * 100LL; if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60LL + ss) * 100LL + ms; if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60LL + ss) * 100LL; if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100LL + ms; return strtoll(s, NULL, 10) * 100ULL; } 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 FFTextReader tr; ff_text_init_avio(s, &tr, s->pb); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 64, 1, 100); st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codecpar->codec_id = AV_CODEC_ID_REALTEXT; av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); while (!ff_text_eof(&tr)) { AVPacket *sub; const int64_t pos = ff_text_pos(&tr) - (c != 0); int n = ff_smil_extract_next_text_chunk(&tr, &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 (st->codecpar->extradata) { res = AVERROR_INVALIDDATA; goto end; } if (p) duration = read_ts(p); st->codecpar->extradata = av_strdup(buf.str); if (!st->codecpar->extradata) { res = AVERROR(ENOMEM); goto end; } st->codecpar->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"); int64_t endi = end ? read_ts(end) : 0; sub->pos = pos; sub->pts = begin ? read_ts(begin) : 0; sub->duration = (end && endi > sub->pts && endi - (uint64_t)sub->pts <= INT64_MAX) ? endi - sub->pts : duration; } } av_bprint_clear(&buf); } ff_subtitles_queue_finalize(s, &rt->q); end: av_bprint_finalize(&buf, NULL); return res; } const AVInputFormat ff_realtext_demuxer = { .name = "realtext", .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"), .priv_data_size = sizeof(RealTextContext), .flags_internal = FF_FMT_INIT_CLEANUP, .read_probe = realtext_probe, .read_header = realtext_read_header, .extensions = "rt", .read_packet = ff_subtitles_read_packet, .read_seek2 = ff_subtitles_read_seek, .read_close = ff_subtitles_read_close, };