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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 | * SAMI subtitle demuxer | |
24 | * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx | |
25 | */ | |
26 | ||
27 | #include "avformat.h" | |
28 | #include "internal.h" | |
29 | #include "subtitles.h" | |
30 | #include "libavcodec/internal.h" | |
31 | #include "libavutil/avstring.h" | |
32 | #include "libavutil/bprint.h" | |
33 | #include "libavutil/intreadwrite.h" | |
34 | ||
35 | typedef struct { | |
36 | FFDemuxSubtitlesQueue q; | |
37 | } SAMIContext; | |
38 | ||
39 | static int sami_probe(AVProbeData *p) | |
40 | { | |
41 | char buf[6]; | |
42 | FFTextReader tr; | |
43 | ff_text_init_buf(&tr, p->buf, p->buf_size); | |
44 | ff_text_read(&tr, buf, sizeof(buf)); | |
45 | ||
46 | return !strncmp(buf, "<SAMI>", 6) ? AVPROBE_SCORE_MAX : 0; | |
47 | } | |
48 | ||
49 | static int sami_read_header(AVFormatContext *s) | |
50 | { | |
51 | SAMIContext *sami = s->priv_data; | |
52 | AVStream *st = avformat_new_stream(s, NULL); | |
53 | AVBPrint buf, hdr_buf; | |
54 | char c = 0; | |
55 | int res = 0, got_first_sync_point = 0; | |
56 | FFTextReader tr; | |
f6fa7814 | 57 | ff_text_init_avio(s, &tr, s->pb); |
2ba45a60 DM |
58 | |
59 | if (!st) | |
60 | return AVERROR(ENOMEM); | |
61 | avpriv_set_pts_info(st, 64, 1, 1000); | |
62 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
63 | st->codec->codec_id = AV_CODEC_ID_SAMI; | |
64 | ||
65 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); | |
66 | av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED); | |
67 | ||
68 | while (!ff_text_eof(&tr)) { | |
69 | AVPacket *sub; | |
70 | const int64_t pos = ff_text_pos(&tr) - (c != 0); | |
71 | int is_sync, n = ff_smil_extract_next_text_chunk(&tr, &buf, &c); | |
72 | ||
73 | if (n == 0) | |
74 | break; | |
75 | ||
76 | is_sync = !av_strncasecmp(buf.str, "<SYNC", 5); | |
77 | if (is_sync) | |
78 | got_first_sync_point = 1; | |
79 | ||
80 | if (!got_first_sync_point) { | |
81 | av_bprintf(&hdr_buf, "%s", buf.str); | |
82 | } else { | |
83 | sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync); | |
84 | if (!sub) { | |
85 | res = AVERROR(ENOMEM); | |
86 | goto end; | |
87 | } | |
88 | if (is_sync) { | |
89 | const char *p = ff_smil_get_attr_ptr(buf.str, "Start"); | |
90 | sub->pos = pos; | |
91 | sub->pts = p ? strtol(p, NULL, 10) : 0; | |
92 | sub->duration = -1; | |
93 | } | |
94 | } | |
95 | av_bprint_clear(&buf); | |
96 | } | |
97 | ||
98 | res = avpriv_bprint_to_extradata(st->codec, &hdr_buf); | |
99 | if (res < 0) | |
100 | goto end; | |
101 | ||
102 | ff_subtitles_queue_finalize(&sami->q); | |
103 | ||
104 | end: | |
105 | av_bprint_finalize(&buf, NULL); | |
106 | return res; | |
107 | } | |
108 | ||
109 | static int sami_read_packet(AVFormatContext *s, AVPacket *pkt) | |
110 | { | |
111 | SAMIContext *sami = s->priv_data; | |
112 | return ff_subtitles_queue_read_packet(&sami->q, pkt); | |
113 | } | |
114 | ||
115 | static int sami_read_seek(AVFormatContext *s, int stream_index, | |
116 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) | |
117 | { | |
118 | SAMIContext *sami = s->priv_data; | |
119 | return ff_subtitles_queue_seek(&sami->q, s, stream_index, | |
120 | min_ts, ts, max_ts, flags); | |
121 | } | |
122 | ||
123 | static int sami_read_close(AVFormatContext *s) | |
124 | { | |
125 | SAMIContext *sami = s->priv_data; | |
126 | ff_subtitles_queue_clean(&sami->q); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | AVInputFormat ff_sami_demuxer = { | |
131 | .name = "sami", | |
132 | .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"), | |
133 | .priv_data_size = sizeof(SAMIContext), | |
134 | .read_probe = sami_probe, | |
135 | .read_header = sami_read_header, | |
136 | .read_packet = sami_read_packet, | |
137 | .read_seek2 = sami_read_seek, | |
138 | .read_close = sami_read_close, | |
139 | .extensions = "smi,sami", | |
140 | }; |