| 1 | /* |
| 2 | * Copyright (c) 2012 Clément Bœsch |
| 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 | |
| 34 | typedef struct { |
| 35 | FFDemuxSubtitlesQueue q; |
| 36 | } RealTextContext; |
| 37 | |
| 38 | static int realtext_probe(AVProbeData *p) |
| 39 | { |
| 40 | char buf[7]; |
| 41 | FFTextReader tr; |
| 42 | ff_text_init_buf(&tr, p->buf, p->buf_size); |
| 43 | ff_text_read(&tr, buf, sizeof(buf)); |
| 44 | |
| 45 | return !av_strncasecmp(buf, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0; |
| 46 | } |
| 47 | |
| 48 | static int read_ts(const char *s) |
| 49 | { |
| 50 | int hh, mm, ss, ms; |
| 51 | |
| 52 | if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600 + mm*60 + ss) * 100 + ms; |
| 53 | if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600 + mm*60 + ss) * 100; |
| 54 | if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60 + ss) * 100 + ms; |
| 55 | if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60 + ss) * 100; |
| 56 | if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100 + ms; |
| 57 | return strtol(s, NULL, 10) * 100; |
| 58 | } |
| 59 | |
| 60 | static int realtext_read_header(AVFormatContext *s) |
| 61 | { |
| 62 | RealTextContext *rt = s->priv_data; |
| 63 | AVStream *st = avformat_new_stream(s, NULL); |
| 64 | AVBPrint buf; |
| 65 | char c = 0; |
| 66 | int res = 0, duration = read_ts("60"); // default duration is 60 seconds |
| 67 | FFTextReader tr; |
| 68 | ff_text_init_avio(s, &tr, s->pb); |
| 69 | |
| 70 | if (!st) |
| 71 | return AVERROR(ENOMEM); |
| 72 | avpriv_set_pts_info(st, 64, 1, 100); |
| 73 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 74 | st->codec->codec_id = AV_CODEC_ID_REALTEXT; |
| 75 | |
| 76 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 77 | |
| 78 | while (!ff_text_eof(&tr)) { |
| 79 | AVPacket *sub; |
| 80 | const int64_t pos = ff_text_pos(&tr) - (c != 0); |
| 81 | int n = ff_smil_extract_next_text_chunk(&tr, &buf, &c); |
| 82 | |
| 83 | if (n == 0) |
| 84 | break; |
| 85 | |
| 86 | if (!av_strncasecmp(buf.str, "<window", 7)) { |
| 87 | /* save header to extradata */ |
| 88 | const char *p = ff_smil_get_attr_ptr(buf.str, "duration"); |
| 89 | |
| 90 | if (p) |
| 91 | duration = read_ts(p); |
| 92 | st->codec->extradata = av_strdup(buf.str); |
| 93 | if (!st->codec->extradata) { |
| 94 | res = AVERROR(ENOMEM); |
| 95 | goto end; |
| 96 | } |
| 97 | st->codec->extradata_size = buf.len + 1; |
| 98 | } else { |
| 99 | /* if we just read a <time> tag, introduce a new event, otherwise merge |
| 100 | * with the previous one */ |
| 101 | int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1; |
| 102 | sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge); |
| 103 | if (!sub) { |
| 104 | res = AVERROR(ENOMEM); |
| 105 | goto end; |
| 106 | } |
| 107 | if (!merge) { |
| 108 | const char *begin = ff_smil_get_attr_ptr(buf.str, "begin"); |
| 109 | const char *end = ff_smil_get_attr_ptr(buf.str, "end"); |
| 110 | |
| 111 | sub->pos = pos; |
| 112 | sub->pts = begin ? read_ts(begin) : 0; |
| 113 | sub->duration = end ? (read_ts(end) - sub->pts) : duration; |
| 114 | } |
| 115 | } |
| 116 | av_bprint_clear(&buf); |
| 117 | } |
| 118 | ff_subtitles_queue_finalize(&rt->q); |
| 119 | |
| 120 | end: |
| 121 | av_bprint_finalize(&buf, NULL); |
| 122 | return res; |
| 123 | } |
| 124 | |
| 125 | static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 126 | { |
| 127 | RealTextContext *rt = s->priv_data; |
| 128 | return ff_subtitles_queue_read_packet(&rt->q, pkt); |
| 129 | } |
| 130 | |
| 131 | static int realtext_read_seek(AVFormatContext *s, int stream_index, |
| 132 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 133 | { |
| 134 | RealTextContext *rt = s->priv_data; |
| 135 | return ff_subtitles_queue_seek(&rt->q, s, stream_index, |
| 136 | min_ts, ts, max_ts, flags); |
| 137 | } |
| 138 | |
| 139 | static int realtext_read_close(AVFormatContext *s) |
| 140 | { |
| 141 | RealTextContext *rt = s->priv_data; |
| 142 | ff_subtitles_queue_clean(&rt->q); |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | AVInputFormat ff_realtext_demuxer = { |
| 147 | .name = "realtext", |
| 148 | .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"), |
| 149 | .priv_data_size = sizeof(RealTextContext), |
| 150 | .read_probe = realtext_probe, |
| 151 | .read_header = realtext_read_header, |
| 152 | .read_packet = realtext_read_packet, |
| 153 | .read_seek2 = realtext_read_seek, |
| 154 | .read_close = realtext_read_close, |
| 155 | .extensions = "rt", |
| 156 | }; |