| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "libavutil/intreadwrite.h" | ||
| 27 | |||
| 28 | #include "avformat.h" | ||
| 29 | #include "demux.h" | ||
| 30 | #include "internal.h" | ||
| 31 | #include "subtitles.h" | ||
| 32 | |||
| 33 | typedef struct { | ||
| 34 | FFDemuxSubtitlesQueue q; | ||
| 35 | } MPL2Context; | ||
| 36 | |||
| 37 | 7128 | static int mpl2_probe(const AVProbeData *p) | |
| 38 | { | ||
| 39 | int i; | ||
| 40 | char c; | ||
| 41 | int64_t start, end; | ||
| 42 | 7128 | const unsigned char *ptr = p->buf; | |
| 43 | 7128 | const unsigned char *ptr_end = ptr + p->buf_size; | |
| 44 | |||
| 45 |
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7128 | if (AV_RB24(ptr) == 0xefbbbf) |
| 46 | 9 | ptr += 3; | |
| 47 | |||
| 48 |
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7130 | for (i = 0; i < 2; i++) { |
| 49 |
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7129 | if (sscanf(ptr, "[%"SCNd64"][%"SCNd64"]%c", &start, &end, &c) != 3 && |
| 50 |
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7128 | sscanf(ptr, "[%"SCNd64"][]%c", &start, &c) != 2) |
| 51 | 7127 | return 0; | |
| 52 | 2 | ptr += ff_subtitles_next_line(ptr); | |
| 53 |
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2 | if (ptr >= ptr_end) |
| 54 | ✗ | return 0; | |
| 55 | } | ||
| 56 | 1 | return AVPROBE_SCORE_MAX; | |
| 57 | } | ||
| 58 | |||
| 59 | 4 | static int read_ts(char **line, int64_t *pts_start, int64_t *duration) | |
| 60 | { | ||
| 61 | char c; | ||
| 62 | int len; | ||
| 63 | int64_t end; | ||
| 64 | |||
| 65 |
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4 | if (sscanf(*line, "[%"SCNd64"][]%c%n", |
| 66 | pts_start, &c, &len) >= 2) { | ||
| 67 | 1 | *duration = -1; | |
| 68 | 1 | *line += len - 1; | |
| 69 | 1 | return 0; | |
| 70 | } | ||
| 71 |
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3 | if (sscanf(*line, "[%"SCNd64"][%"SCNd64"]%c%n", |
| 72 | pts_start, &end, &c, &len) >= 3) { | ||
| 73 |
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3 | if (end < *pts_start || end - (uint64_t)*pts_start > INT64_MAX) { |
| 74 | ✗ | *duration = -1; | |
| 75 | } else | ||
| 76 | 3 | *duration = end - *pts_start; | |
| 77 | 3 | *line += len - 1; | |
| 78 | 3 | return 0; | |
| 79 | } | ||
| 80 | ✗ | return -1; | |
| 81 | } | ||
| 82 | |||
| 83 | 1 | static int mpl2_read_header(AVFormatContext *s) | |
| 84 | { | ||
| 85 | 1 | MPL2Context *mpl2 = s->priv_data; | |
| 86 | 1 | AVStream *st = avformat_new_stream(s, NULL); | |
| 87 | |||
| 88 |
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1 | if (!st) |
| 89 | ✗ | return AVERROR(ENOMEM); | |
| 90 | 1 | avpriv_set_pts_info(st, 64, 1, 10); | |
| 91 | 1 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
| 92 | 1 | st->codecpar->codec_id = AV_CODEC_ID_MPL2; | |
| 93 | |||
| 94 |
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1 | if (avio_rb24(s->pb) != 0xefbbbf) |
| 95 | 1 | avio_seek(s->pb, -3, SEEK_CUR); | |
| 96 | |||
| 97 |
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5 | while (!avio_feof(s->pb)) { |
| 98 | char line[4096]; | ||
| 99 | 5 | char *p = line; | |
| 100 | 5 | const int64_t pos = avio_tell(s->pb); | |
| 101 | 5 | int len = ff_get_line(s->pb, line, sizeof(line)); | |
| 102 | int64_t pts_start; | ||
| 103 | int64_t duration; | ||
| 104 | |||
| 105 |
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5 | if (!len) |
| 106 | 1 | break; | |
| 107 | |||
| 108 | 4 | line[strcspn(line, "\r\n")] = 0; | |
| 109 | |||
| 110 |
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4 | if (!read_ts(&p, &pts_start, &duration)) { |
| 111 | AVPacket *sub; | ||
| 112 | |||
| 113 | 4 | sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0); | |
| 114 |
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4 | if (!sub) |
| 115 | ✗ | return AVERROR(ENOMEM); | |
| 116 | 4 | sub->pos = pos; | |
| 117 | 4 | sub->pts = pts_start; | |
| 118 | 4 | sub->duration = duration; | |
| 119 | } | ||
| 120 | } | ||
| 121 | |||
| 122 | 1 | ff_subtitles_queue_finalize(s, &mpl2->q); | |
| 123 | 1 | return 0; | |
| 124 | } | ||
| 125 | |||
| 126 | const FFInputFormat ff_mpl2_demuxer = { | ||
| 127 | .p.name = "mpl2", | ||
| 128 | .p.long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitles"), | ||
| 129 | .p.extensions = "txt,mpl2", | ||
| 130 | .priv_data_size = sizeof(MPL2Context), | ||
| 131 | .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | ||
| 132 | .read_probe = mpl2_probe, | ||
| 133 | .read_header = mpl2_read_header, | ||
| 134 | .read_packet = ff_subtitles_read_packet, | ||
| 135 | .read_seek2 = ff_subtitles_read_seek, | ||
| 136 | .read_close = ff_subtitles_read_close, | ||
| 137 | }; | ||
| 138 |