| 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 | * PJS (Phoenix Japanimation Society) subtitles format demuxer |
| 24 | * |
| 25 | * @see http://subs.com.ru/page.php?al=pjs |
| 26 | */ |
| 27 | |
| 28 | #include "avformat.h" |
| 29 | #include "internal.h" |
| 30 | #include "subtitles.h" |
| 31 | |
| 32 | typedef struct { |
| 33 | FFDemuxSubtitlesQueue q; |
| 34 | } PJSContext; |
| 35 | |
| 36 | static int pjs_probe(AVProbeData *p) |
| 37 | { |
| 38 | char c; |
| 39 | int64_t start, end; |
| 40 | const unsigned char *ptr = p->buf; |
| 41 | |
| 42 | if (sscanf(ptr, "%"SCNd64",%"SCNd64",%c", &start, &end, &c) == 3) { |
| 43 | size_t q1pos = strcspn(ptr, "\""); |
| 44 | size_t q2pos = q1pos + strcspn(ptr + q1pos + 1, "\"") + 1; |
| 45 | if (strcspn(ptr, "\r\n") > q2pos) |
| 46 | return AVPROBE_SCORE_MAX; |
| 47 | } |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | static int64_t read_ts(char **line, int *duration) |
| 52 | { |
| 53 | int64_t start, end; |
| 54 | |
| 55 | if (sscanf(*line, "%"SCNd64",%"SCNd64, &start, &end) == 2) { |
| 56 | *line += strcspn(*line, "\""); |
| 57 | *line += !!**line; |
| 58 | *duration = end - start; |
| 59 | return start; |
| 60 | } |
| 61 | return AV_NOPTS_VALUE; |
| 62 | } |
| 63 | |
| 64 | static int pjs_read_header(AVFormatContext *s) |
| 65 | { |
| 66 | PJSContext *pjs = s->priv_data; |
| 67 | AVStream *st = avformat_new_stream(s, NULL); |
| 68 | int res = 0; |
| 69 | |
| 70 | if (!st) |
| 71 | return AVERROR(ENOMEM); |
| 72 | avpriv_set_pts_info(st, 64, 1, 10); |
| 73 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 74 | st->codec->codec_id = AV_CODEC_ID_PJS; |
| 75 | |
| 76 | while (!avio_feof(s->pb)) { |
| 77 | char line[4096]; |
| 78 | char *p = line; |
| 79 | const int64_t pos = avio_tell(s->pb); |
| 80 | int len = ff_get_line(s->pb, line, sizeof(line)); |
| 81 | int64_t pts_start; |
| 82 | int duration; |
| 83 | |
| 84 | if (!len) |
| 85 | break; |
| 86 | |
| 87 | line[strcspn(line, "\r\n")] = 0; |
| 88 | |
| 89 | pts_start = read_ts(&p, &duration); |
| 90 | if (pts_start != AV_NOPTS_VALUE) { |
| 91 | AVPacket *sub; |
| 92 | |
| 93 | p[strcspn(p, "\"")] = 0; |
| 94 | sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0); |
| 95 | if (!sub) |
| 96 | return AVERROR(ENOMEM); |
| 97 | sub->pos = pos; |
| 98 | sub->pts = pts_start; |
| 99 | sub->duration = duration; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | ff_subtitles_queue_finalize(&pjs->q); |
| 104 | return res; |
| 105 | } |
| 106 | |
| 107 | static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 108 | { |
| 109 | PJSContext *pjs = s->priv_data; |
| 110 | return ff_subtitles_queue_read_packet(&pjs->q, pkt); |
| 111 | } |
| 112 | |
| 113 | static int pjs_read_seek(AVFormatContext *s, int stream_index, |
| 114 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 115 | { |
| 116 | PJSContext *pjs = s->priv_data; |
| 117 | return ff_subtitles_queue_seek(&pjs->q, s, stream_index, |
| 118 | min_ts, ts, max_ts, flags); |
| 119 | } |
| 120 | |
| 121 | static int pjs_read_close(AVFormatContext *s) |
| 122 | { |
| 123 | PJSContext *pjs = s->priv_data; |
| 124 | ff_subtitles_queue_clean(&pjs->q); |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | AVInputFormat ff_pjs_demuxer = { |
| 129 | .name = "pjs", |
| 130 | .long_name = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"), |
| 131 | .priv_data_size = sizeof(PJSContext), |
| 132 | .read_probe = pjs_probe, |
| 133 | .read_header = pjs_read_header, |
| 134 | .read_packet = pjs_read_packet, |
| 135 | .read_seek2 = pjs_read_seek, |
| 136 | .read_close = pjs_read_close, |
| 137 | .extensions = "pjs", |
| 138 | }; |