Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 | }; |