| 1 | /* |
| 2 | * Copyright (c) 2014 Eejya Singh |
| 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 | * STL subtitles format demuxer |
| 24 | * @see https://documentation.apple.com/en/dvdstudiopro/usermanual/index.html#chapter=19%26section=13%26tasks=true |
| 25 | */ |
| 26 | |
| 27 | #include "avformat.h" |
| 28 | #include "internal.h" |
| 29 | #include "subtitles.h" |
| 30 | #include "libavutil/intreadwrite.h" |
| 31 | #include "libavutil/avstring.h" |
| 32 | |
| 33 | typedef struct { |
| 34 | FFDemuxSubtitlesQueue q; |
| 35 | } STLContext; |
| 36 | |
| 37 | static int stl_probe(AVProbeData *p) |
| 38 | { |
| 39 | char c; |
| 40 | const unsigned char *ptr = p->buf; |
| 41 | |
| 42 | if (AV_RB24(ptr) == 0xEFBBBF) |
| 43 | ptr += 3; /* skip UTF-8 BOM */ |
| 44 | |
| 45 | while (*ptr == '\r' || *ptr == '\n' || *ptr == '$' || !strncmp(ptr, "//" , 2)) |
| 46 | ptr += ff_subtitles_next_line(ptr); |
| 47 | |
| 48 | if (sscanf(ptr, "%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d , %c", &c) == 1) |
| 49 | return AVPROBE_SCORE_MAX; |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | static int64_t get_pts(char **buf, int *duration) |
| 55 | { |
| 56 | int hh1, mm1, ss1, ms1; |
| 57 | int hh2, mm2, ss2, ms2; |
| 58 | int len = 0; |
| 59 | |
| 60 | if (sscanf(*buf, "%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , %n", |
| 61 | &hh1, &mm1, &ss1, &ms1, |
| 62 | &hh2, &mm2, &ss2, &ms2, &len) >= 8 && len > 0) { |
| 63 | int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1; |
| 64 | int64_t end = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2; |
| 65 | *duration = end - start; |
| 66 | *buf += len; |
| 67 | return start; |
| 68 | } |
| 69 | return AV_NOPTS_VALUE; |
| 70 | } |
| 71 | |
| 72 | static int stl_read_header(AVFormatContext *s) |
| 73 | { |
| 74 | STLContext *stl = s->priv_data; |
| 75 | AVStream *st = avformat_new_stream(s, NULL); |
| 76 | |
| 77 | if (!st) |
| 78 | return AVERROR(ENOMEM); |
| 79 | avpriv_set_pts_info(st, 64, 1, 100); |
| 80 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 81 | st->codec->codec_id = AV_CODEC_ID_STL; |
| 82 | |
| 83 | while (!avio_feof(s->pb)) { |
| 84 | char line[4096]; |
| 85 | char *p = line; |
| 86 | const int64_t pos = avio_tell(s->pb); |
| 87 | int len = ff_get_line(s->pb, line, sizeof(line)); |
| 88 | int64_t pts_start; |
| 89 | int duration; |
| 90 | |
| 91 | if (!len) |
| 92 | break; |
| 93 | |
| 94 | line[strcspn(line, "\r\n")] = 0; |
| 95 | pts_start = get_pts(&p , &duration); |
| 96 | |
| 97 | if (pts_start != AV_NOPTS_VALUE) { |
| 98 | AVPacket *sub; |
| 99 | sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0); |
| 100 | if (!sub) |
| 101 | return AVERROR(ENOMEM); |
| 102 | sub->pos = pos; |
| 103 | sub->pts = pts_start; |
| 104 | sub->duration = duration; |
| 105 | } |
| 106 | } |
| 107 | ff_subtitles_queue_finalize(&stl->q); |
| 108 | return 0; |
| 109 | } |
| 110 | static int stl_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 111 | { |
| 112 | STLContext *stl = s->priv_data; |
| 113 | return ff_subtitles_queue_read_packet(&stl->q, pkt); |
| 114 | } |
| 115 | |
| 116 | static int stl_read_seek(AVFormatContext *s, int stream_index, |
| 117 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 118 | { |
| 119 | STLContext *stl = s->priv_data; |
| 120 | return ff_subtitles_queue_seek(&stl->q, s, stream_index, |
| 121 | min_ts, ts, max_ts, flags); |
| 122 | } |
| 123 | |
| 124 | static int stl_read_close(AVFormatContext *s) |
| 125 | { |
| 126 | STLContext *stl = s->priv_data; |
| 127 | ff_subtitles_queue_clean(&stl->q); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | AVInputFormat ff_stl_demuxer = { |
| 132 | .name = "stl", |
| 133 | .long_name = NULL_IF_CONFIG_SMALL("Spruce subtitle format"), |
| 134 | .priv_data_size = sizeof(STLContext), |
| 135 | .read_probe = stl_probe, |
| 136 | .read_header = stl_read_header, |
| 137 | .read_packet = stl_read_packet, |
| 138 | .read_seek2 = stl_read_seek, |
| 139 | .read_close = stl_read_close, |
| 140 | .extensions = "stl", |
| 141 | }; |