/* * 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_MAX/2 : 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_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_close = realtext_read_close, .flags = AVFMT_GENERIC_INDEX, .extensions = "rt", };