| 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 | * SubViewer subtitle demuxer |
| 24 | * @see https://en.wikipedia.org/wiki/SubViewer |
| 25 | */ |
| 26 | |
| 27 | #include "avformat.h" |
| 28 | #include "internal.h" |
| 29 | #include "subtitles.h" |
| 30 | #include "libavcodec/internal.h" |
| 31 | #include "libavutil/avstring.h" |
| 32 | #include "libavutil/bprint.h" |
| 33 | #include "libavutil/intreadwrite.h" |
| 34 | |
| 35 | typedef struct { |
| 36 | FFDemuxSubtitlesQueue q; |
| 37 | } SubViewerContext; |
| 38 | |
| 39 | static int subviewer_probe(AVProbeData *p) |
| 40 | { |
| 41 | char c; |
| 42 | const unsigned char *ptr = p->buf; |
| 43 | |
| 44 | if (AV_RB24(ptr) == 0xEFBBBF) |
| 45 | ptr += 3; /* skip UTF-8 BOM */ |
| 46 | if (sscanf(ptr, "%*u:%*u:%*u.%*u,%*u:%*u:%*u.%*u%c", &c) == 1) |
| 47 | return AVPROBE_SCORE_EXTENSION; |
| 48 | if (!strncmp(ptr, "[INFORMATION]", 13)) |
| 49 | return AVPROBE_SCORE_MAX/3; |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | static int read_ts(const char *s, int64_t *start, int *duration) |
| 54 | { |
| 55 | int64_t end; |
| 56 | int hh1, mm1, ss1, ms1; |
| 57 | int hh2, mm2, ss2, ms2; |
| 58 | |
| 59 | if (sscanf(s, "%u:%u:%u.%u,%u:%u:%u.%u", |
| 60 | &hh1, &mm1, &ss1, &ms1, &hh2, &mm2, &ss2, &ms2) == 8) { |
| 61 | end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2; |
| 62 | *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1; |
| 63 | *duration = end - *start; |
| 64 | return 0; |
| 65 | } |
| 66 | return -1; |
| 67 | } |
| 68 | |
| 69 | static int subviewer_read_header(AVFormatContext *s) |
| 70 | { |
| 71 | SubViewerContext *subviewer = s->priv_data; |
| 72 | AVStream *st = avformat_new_stream(s, NULL); |
| 73 | AVBPrint header; |
| 74 | int res = 0, new_event = 1; |
| 75 | int64_t pts_start = AV_NOPTS_VALUE; |
| 76 | int duration = -1; |
| 77 | AVPacket *sub = NULL; |
| 78 | |
| 79 | if (!st) |
| 80 | return AVERROR(ENOMEM); |
| 81 | avpriv_set_pts_info(st, 64, 1, 100); |
| 82 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 83 | st->codec->codec_id = AV_CODEC_ID_SUBVIEWER; |
| 84 | |
| 85 | av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED); |
| 86 | |
| 87 | while (!avio_feof(s->pb)) { |
| 88 | char line[2048]; |
| 89 | int64_t pos = 0; |
| 90 | int len = ff_get_line(s->pb, line, sizeof(line)); |
| 91 | |
| 92 | if (!len) |
| 93 | break; |
| 94 | |
| 95 | line[strcspn(line, "\r\n")] = 0; |
| 96 | |
| 97 | if (line[0] == '[' && strncmp(line, "[br]", 4)) { |
| 98 | |
| 99 | /* ignore event style, XXX: add to side_data? */ |
| 100 | if (strstr(line, "[COLF]") || strstr(line, "[SIZE]") || |
| 101 | strstr(line, "[FONT]") || strstr(line, "[STYLE]")) |
| 102 | continue; |
| 103 | |
| 104 | if (!st->codec->extradata) { // header not finalized yet |
| 105 | av_bprintf(&header, "%s\n", line); |
| 106 | if (!strncmp(line, "[END INFORMATION]", 17) || !strncmp(line, "[SUBTITLE]", 10)) { |
| 107 | /* end of header */ |
| 108 | res = avpriv_bprint_to_extradata(st->codec, &header); |
| 109 | if (res < 0) |
| 110 | goto end; |
| 111 | } else if (strncmp(line, "[INFORMATION]", 13)) { |
| 112 | /* assume file metadata at this point */ |
| 113 | int i, j = 0; |
| 114 | char key[32], value[128]; |
| 115 | |
| 116 | for (i = 1; i < sizeof(key) - 1 && line[i] && line[i] != ']'; i++) |
| 117 | key[i - 1] = av_tolower(line[i]); |
| 118 | key[i - 1] = 0; |
| 119 | |
| 120 | if (line[i] == ']') |
| 121 | i++; |
| 122 | while (line[i] == ' ') |
| 123 | i++; |
| 124 | while (j < sizeof(value) - 1 && line[i] && line[i] != ']') |
| 125 | value[j++] = line[i++]; |
| 126 | value[j] = 0; |
| 127 | |
| 128 | av_dict_set(&s->metadata, key, value, 0); |
| 129 | } |
| 130 | } |
| 131 | } else if (read_ts(line, &pts_start, &duration) >= 0) { |
| 132 | new_event = 1; |
| 133 | pos = avio_tell(s->pb); |
| 134 | } else if (*line) { |
| 135 | if (!new_event) { |
| 136 | sub = ff_subtitles_queue_insert(&subviewer->q, "\n", 1, 1); |
| 137 | if (!sub) { |
| 138 | res = AVERROR(ENOMEM); |
| 139 | goto end; |
| 140 | } |
| 141 | } |
| 142 | sub = ff_subtitles_queue_insert(&subviewer->q, line, strlen(line), !new_event); |
| 143 | if (!sub) { |
| 144 | res = AVERROR(ENOMEM); |
| 145 | goto end; |
| 146 | } |
| 147 | if (new_event) { |
| 148 | sub->pos = pos; |
| 149 | sub->pts = pts_start; |
| 150 | sub->duration = duration; |
| 151 | } |
| 152 | new_event = 0; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | ff_subtitles_queue_finalize(&subviewer->q); |
| 157 | |
| 158 | end: |
| 159 | av_bprint_finalize(&header, NULL); |
| 160 | return res; |
| 161 | } |
| 162 | |
| 163 | static int subviewer_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 164 | { |
| 165 | SubViewerContext *subviewer = s->priv_data; |
| 166 | return ff_subtitles_queue_read_packet(&subviewer->q, pkt); |
| 167 | } |
| 168 | |
| 169 | static int subviewer_read_seek(AVFormatContext *s, int stream_index, |
| 170 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 171 | { |
| 172 | SubViewerContext *subviewer = s->priv_data; |
| 173 | return ff_subtitles_queue_seek(&subviewer->q, s, stream_index, |
| 174 | min_ts, ts, max_ts, flags); |
| 175 | } |
| 176 | |
| 177 | static int subviewer_read_close(AVFormatContext *s) |
| 178 | { |
| 179 | SubViewerContext *subviewer = s->priv_data; |
| 180 | ff_subtitles_queue_clean(&subviewer->q); |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | AVInputFormat ff_subviewer_demuxer = { |
| 185 | .name = "subviewer", |
| 186 | .long_name = NULL_IF_CONFIG_SMALL("SubViewer subtitle format"), |
| 187 | .priv_data_size = sizeof(SubViewerContext), |
| 188 | .read_probe = subviewer_probe, |
| 189 | .read_header = subviewer_read_header, |
| 190 | .read_packet = subviewer_read_packet, |
| 191 | .read_seek2 = subviewer_read_seek, |
| 192 | .read_close = subviewer_read_close, |
| 193 | .extensions = "sub", |
| 194 | }; |