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2ba45a60 DM |
1 | /* |
2 | * Metadata demuxer | |
3 | * Copyright (c) 2010 Anton Khirnov | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "libavutil/mathematics.h" | |
23 | #include "avformat.h" | |
24 | #include "ffmeta.h" | |
25 | #include "internal.h" | |
26 | #include "libavutil/dict.h" | |
27 | ||
28 | static int probe(AVProbeData *p) | |
29 | { | |
30 | if(!memcmp(p->buf, ID_STRING, strlen(ID_STRING))) | |
31 | return AVPROBE_SCORE_MAX; | |
32 | return 0; | |
33 | } | |
34 | ||
35 | static void get_line(AVIOContext *s, uint8_t *buf, int size) | |
36 | { | |
37 | do { | |
38 | uint8_t c; | |
39 | int i = 0; | |
40 | ||
41 | while ((c = avio_r8(s))) { | |
42 | if (c == '\\') { | |
43 | if (i < size - 1) | |
44 | buf[i++] = c; | |
45 | c = avio_r8(s); | |
46 | } else if (c == '\n') | |
47 | break; | |
48 | ||
49 | if (i < size - 1) | |
50 | buf[i++] = c; | |
51 | } | |
52 | buf[i] = 0; | |
53 | } while (!avio_feof(s) && (buf[0] == ';' || buf[0] == '#' || buf[0] == 0)); | |
54 | } | |
55 | ||
56 | static AVChapter *read_chapter(AVFormatContext *s) | |
57 | { | |
58 | uint8_t line[256]; | |
59 | int64_t start, end; | |
60 | AVRational tb = {1, 1e9}; | |
61 | ||
62 | get_line(s->pb, line, sizeof(line)); | |
63 | ||
64 | if (sscanf(line, "TIMEBASE=%d/%d", &tb.num, &tb.den)) | |
65 | get_line(s->pb, line, sizeof(line)); | |
66 | if (!sscanf(line, "START=%"SCNd64, &start)) { | |
67 | av_log(s, AV_LOG_ERROR, "Expected chapter start timestamp, found %s.\n", line); | |
68 | start = (s->nb_chapters && s->chapters[s->nb_chapters - 1]->end != AV_NOPTS_VALUE) ? | |
69 | s->chapters[s->nb_chapters - 1]->end : 0; | |
70 | } else | |
71 | get_line(s->pb, line, sizeof(line)); | |
72 | ||
73 | if (!sscanf(line, "END=%"SCNd64, &end)) { | |
74 | av_log(s, AV_LOG_ERROR, "Expected chapter end timestamp, found %s.\n", line); | |
75 | end = AV_NOPTS_VALUE; | |
76 | } | |
77 | ||
78 | return avpriv_new_chapter(s, s->nb_chapters, tb, start, end, NULL); | |
79 | } | |
80 | ||
81 | static uint8_t *unescape(uint8_t *buf, int size) | |
82 | { | |
83 | uint8_t *ret = av_malloc(size + 1); | |
84 | uint8_t *p1 = ret, *p2 = buf; | |
85 | ||
86 | if (!ret) | |
87 | return NULL; | |
88 | ||
89 | while (p2 < buf + size) { | |
90 | if (*p2 == '\\') | |
91 | p2++; | |
92 | *p1++ = *p2++; | |
93 | } | |
94 | *p1 = 0; | |
95 | return ret; | |
96 | } | |
97 | ||
98 | static int read_tag(uint8_t *line, AVDictionary **m) | |
99 | { | |
100 | uint8_t *key, *value, *p = line; | |
101 | ||
102 | /* find first not escaped '=' */ | |
103 | while (1) { | |
104 | if (*p == '=') | |
105 | break; | |
106 | else if (*p == '\\') | |
107 | p++; | |
108 | ||
109 | if (*p++) | |
110 | continue; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | if (!(key = unescape(line, p - line))) | |
116 | return AVERROR(ENOMEM); | |
117 | if (!(value = unescape(p + 1, strlen(p + 1)))) { | |
118 | av_free(key); | |
119 | return AVERROR(ENOMEM); | |
120 | } | |
121 | ||
122 | av_dict_set(m, key, value, AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int read_header(AVFormatContext *s) | |
127 | { | |
128 | AVDictionary **m = &s->metadata; | |
129 | uint8_t line[1024]; | |
130 | ||
131 | while(!avio_feof(s->pb)) { | |
132 | get_line(s->pb, line, sizeof(line)); | |
133 | ||
134 | if (!memcmp(line, ID_STREAM, strlen(ID_STREAM))) { | |
135 | AVStream *st = avformat_new_stream(s, NULL); | |
136 | ||
137 | if (!st) | |
138 | return AVERROR(ENOMEM); | |
139 | ||
140 | st->codec->codec_type = AVMEDIA_TYPE_DATA; | |
141 | st->codec->codec_id = AV_CODEC_ID_FFMETADATA; | |
142 | ||
143 | m = &st->metadata; | |
144 | } else if (!memcmp(line, ID_CHAPTER, strlen(ID_CHAPTER))) { | |
145 | AVChapter *ch = read_chapter(s); | |
146 | ||
147 | if (!ch) | |
148 | return AVERROR(ENOMEM); | |
149 | ||
150 | m = &ch->metadata; | |
151 | } else | |
152 | read_tag(line, m); | |
153 | } | |
154 | ||
155 | s->start_time = 0; | |
156 | if (s->nb_chapters) | |
157 | s->duration = av_rescale_q(s->chapters[s->nb_chapters - 1]->end, | |
158 | s->chapters[s->nb_chapters - 1]->time_base, | |
159 | AV_TIME_BASE_Q); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
165 | { | |
166 | return AVERROR_EOF; | |
167 | } | |
168 | ||
169 | AVInputFormat ff_ffmetadata_demuxer = { | |
170 | .name = "ffmetadata", | |
171 | .long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text"), | |
172 | .read_probe = probe, | |
173 | .read_header = read_header, | |
174 | .read_packet = read_packet, | |
175 | }; |