1/* 2 * Copyright (c) 2012 Cl��ment B��sch 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * RealText subtitle demuxer 24 * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm 25 */ 26 27#include "avformat.h" 28#include "internal.h" 29#include "subtitles.h" 30#include "libavutil/avstring.h" 31#include "libavutil/bprint.h" 32#include "libavutil/intreadwrite.h" 33 34typedef struct { 35 FFDemuxSubtitlesQueue q; 36} RealTextContext; 37 38static int realtext_probe(AVProbeData *p) 39{ 40 const unsigned char *ptr = p->buf; 41 42 if (AV_RB24(ptr) == 0xEFBBBF) 43 ptr += 3; /* skip UTF-8 BOM */ 44 return !av_strncasecmp(ptr, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0; 45} 46 47static int read_ts(const char *s) 48{ 49 int hh, mm, ss, ms; 50 51 if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600 + mm*60 + ss) * 100 + ms; 52 if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600 + mm*60 + ss) * 100; 53 if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60 + ss) * 100 + ms; 54 if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60 + ss) * 100; 55 if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100 + ms; 56 return strtol(s, NULL, 10) * 100; 57} 58 59static int realtext_read_header(AVFormatContext *s) 60{ 61 RealTextContext *rt = s->priv_data; 62 AVStream *st = avformat_new_stream(s, NULL); 63 AVBPrint buf; 64 char c = 0; 65 int res = 0, duration = read_ts("60"); // default duration is 60 seconds 66 67 if (!st) 68 return AVERROR(ENOMEM); 69 avpriv_set_pts_info(st, 64, 1, 100); 70 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; 71 st->codec->codec_id = AV_CODEC_ID_REALTEXT; 72 73 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); 74 75 while (!url_feof(s->pb)) { 76 AVPacket *sub; 77 const int64_t pos = avio_tell(s->pb) - (c != 0); 78 int n = ff_smil_extract_next_chunk(s->pb, &buf, &c); 79 80 if (n == 0) 81 break; 82 83 if (!av_strncasecmp(buf.str, "<window", 7)) { 84 /* save header to extradata */ 85 const char *p = ff_smil_get_attr_ptr(buf.str, "duration"); 86 87 if (p) 88 duration = read_ts(p); 89 st->codec->extradata = av_strdup(buf.str); 90 if (!st->codec->extradata) { 91 res = AVERROR(ENOMEM); 92 goto end; 93 } 94 st->codec->extradata_size = buf.len + 1; 95 } else { 96 /* if we just read a <time> tag, introduce a new event, otherwise merge 97 * with the previous one */ 98 int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1; 99 sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge); 100 if (!sub) { 101 res = AVERROR(ENOMEM); 102 goto end; 103 } 104 if (!merge) { 105 const char *begin = ff_smil_get_attr_ptr(buf.str, "begin"); 106 const char *end = ff_smil_get_attr_ptr(buf.str, "end"); 107 108 sub->pos = pos; 109 sub->pts = begin ? read_ts(begin) : 0; 110 sub->duration = end ? (read_ts(end) - sub->pts) : duration; 111 } 112 } 113 av_bprint_clear(&buf); 114 } 115 ff_subtitles_queue_finalize(&rt->q); 116 117end: 118 av_bprint_finalize(&buf, NULL); 119 return res; 120} 121 122static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt) 123{ 124 RealTextContext *rt = s->priv_data; 125 return ff_subtitles_queue_read_packet(&rt->q, pkt); 126} 127 128static int realtext_read_seek(AVFormatContext *s, int stream_index, 129 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 136static 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 143AVInputFormat ff_realtext_demuxer = { 144 .name = "realtext", 145 .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"), 146 .priv_data_size = sizeof(RealTextContext), 147 .read_probe = realtext_probe, 148 .read_header = realtext_read_header, 149 .read_packet = realtext_read_packet, 150 .read_seek2 = realtext_read_seek, 151 .read_close = realtext_read_close, 152 .extensions = "rt", 153}; 154