| 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 | * MPL2 subtitles format demuxer |
| 24 | */ |
| 25 | |
| 26 | #include "avformat.h" |
| 27 | #include "internal.h" |
| 28 | #include "subtitles.h" |
| 29 | |
| 30 | typedef struct { |
| 31 | FFDemuxSubtitlesQueue q; |
| 32 | } MPL2Context; |
| 33 | |
| 34 | static int mpl2_probe(AVProbeData *p) |
| 35 | { |
| 36 | int i; |
| 37 | char c; |
| 38 | int64_t start, end; |
| 39 | const unsigned char *ptr = p->buf; |
| 40 | const unsigned char *ptr_end = ptr + p->buf_size; |
| 41 | |
| 42 | for (i = 0; i < 2; i++) { |
| 43 | if (sscanf(ptr, "[%"SCNd64"][%"SCNd64"]%c", &start, &end, &c) != 3 && |
| 44 | sscanf(ptr, "[%"SCNd64"][]%c", &start, &c) != 2) |
| 45 | return 0; |
| 46 | ptr += ff_subtitles_next_line(ptr); |
| 47 | if (ptr >= ptr_end) |
| 48 | return 0; |
| 49 | } |
| 50 | return AVPROBE_SCORE_MAX; |
| 51 | } |
| 52 | |
| 53 | static int read_ts(char **line, int64_t *pts_start, int *duration) |
| 54 | { |
| 55 | char c; |
| 56 | int len; |
| 57 | int64_t end; |
| 58 | |
| 59 | if (sscanf(*line, "[%"SCNd64"][]%c%n", |
| 60 | pts_start, &c, &len) >= 2) { |
| 61 | *duration = -1; |
| 62 | *line += len - 1; |
| 63 | return 0; |
| 64 | } |
| 65 | if (sscanf(*line, "[%"SCNd64"][%"SCNd64"]%c%n", |
| 66 | pts_start, &end, &c, &len) >= 3) { |
| 67 | *duration = end - *pts_start; |
| 68 | *line += len - 1; |
| 69 | return 0; |
| 70 | } |
| 71 | return -1; |
| 72 | } |
| 73 | |
| 74 | static int mpl2_read_header(AVFormatContext *s) |
| 75 | { |
| 76 | MPL2Context *mpl2 = s->priv_data; |
| 77 | AVStream *st = avformat_new_stream(s, NULL); |
| 78 | int res = 0; |
| 79 | |
| 80 | if (!st) |
| 81 | return AVERROR(ENOMEM); |
| 82 | avpriv_set_pts_info(st, 64, 1, 10); |
| 83 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
| 84 | st->codec->codec_id = AV_CODEC_ID_MPL2; |
| 85 | |
| 86 | while (!avio_feof(s->pb)) { |
| 87 | char line[4096]; |
| 88 | char *p = line; |
| 89 | const int64_t pos = avio_tell(s->pb); |
| 90 | int len = ff_get_line(s->pb, line, sizeof(line)); |
| 91 | int64_t pts_start; |
| 92 | int duration; |
| 93 | |
| 94 | if (!len) |
| 95 | break; |
| 96 | |
| 97 | line[strcspn(line, "\r\n")] = 0; |
| 98 | |
| 99 | if (!read_ts(&p, &pts_start, &duration)) { |
| 100 | AVPacket *sub; |
| 101 | |
| 102 | sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0); |
| 103 | if (!sub) |
| 104 | return AVERROR(ENOMEM); |
| 105 | sub->pos = pos; |
| 106 | sub->pts = pts_start; |
| 107 | sub->duration = duration; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | ff_subtitles_queue_finalize(&mpl2->q); |
| 112 | return res; |
| 113 | } |
| 114 | |
| 115 | static int mpl2_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 116 | { |
| 117 | MPL2Context *mpl2 = s->priv_data; |
| 118 | return ff_subtitles_queue_read_packet(&mpl2->q, pkt); |
| 119 | } |
| 120 | |
| 121 | static int mpl2_read_seek(AVFormatContext *s, int stream_index, |
| 122 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| 123 | { |
| 124 | MPL2Context *mpl2 = s->priv_data; |
| 125 | return ff_subtitles_queue_seek(&mpl2->q, s, stream_index, |
| 126 | min_ts, ts, max_ts, flags); |
| 127 | } |
| 128 | |
| 129 | static int mpl2_read_close(AVFormatContext *s) |
| 130 | { |
| 131 | MPL2Context *mpl2 = s->priv_data; |
| 132 | ff_subtitles_queue_clean(&mpl2->q); |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | AVInputFormat ff_mpl2_demuxer = { |
| 137 | .name = "mpl2", |
| 138 | .long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitles"), |
| 139 | .priv_data_size = sizeof(MPL2Context), |
| 140 | .read_probe = mpl2_probe, |
| 141 | .read_header = mpl2_read_header, |
| 142 | .read_packet = mpl2_read_packet, |
| 143 | .read_seek2 = mpl2_read_seek, |
| 144 | .read_close = mpl2_read_close, |
| 145 | .extensions = "txt,mpl2", |
| 146 | }; |