fix mimetype
[libav.git] / libavformat / oggparsevorbis.c
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1/**
2 Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
3
4 Permission is hereby granted, free of charge, to any person
5 obtaining a copy of this software and associated documentation
6 files (the "Software"), to deal in the Software without
7 restriction, including without limitation the rights to use, copy,
8 modify, merge, publish, distribute, sublicense, and/or sell copies
9 of the Software, and to permit persons to whom the Software is
10 furnished to do so, subject to the following conditions:
11
12 The above copyright notice and this permission notice shall be
13 included in all copies or substantial portions of the Software.
14
15 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 DEALINGS IN THE SOFTWARE.
23**/
24
25#include <stdlib.h>
26#include "avformat.h"
27#include "bitstream.h"
28#include "bswap.h"
29#include "ogg2.h"
30
31extern int
32vorbis_comment (AVFormatContext * as, char *buf, int size)
33{
34 char *p = buf;
35 int s, n, j;
36
37 if (size < 4)
38 return -1;
39
40 s = le2me_32 (unaligned32 (p));
41 p += 4;
42 size -= 4;
43
44 if (size < s + 4)
45 return -1;
46
47 p += s;
48 size -= s;
49
50 n = le2me_32 (unaligned32 (p));
51 p += 4;
52 size -= 4;
53
54 while (size >= 4){
55 char *t, *v;
56 int tl, vl;
57
58 s = le2me_32 (unaligned32 (p));
59 p += 4;
60 size -= 4;
61
62 if (size < s)
63 break;
64
65 t = p;
66 p += s;
67 size -= s;
68 n--;
69
70 v = memchr (t, '=', s);
71 if (!v)
72 continue;
73
74 tl = v - t;
75 vl = s - tl - 1;
76 v++;
77
78 if (tl && vl){
79 char tt[tl + 1];
80 char ct[vl + 1];
81
82 for (j = 0; j < tl; j++)
83 tt[j] = toupper (t[j]);
84 tt[tl] = 0;
85
86 memcpy (ct, v, vl);
87 ct[vl] = 0;
88
89 // took from Vorbis_I_spec
90 if (!strcmp (tt, "AUTHOR"))
91 strncpy (as->author, ct, FFMIN(sizeof (as->author), vl));
92 else if (!strcmp (tt, "TITLE"))
93 strncpy (as->title, ct, FFMIN(sizeof (as->title), vl));
94 else if (!strcmp (tt, "COPYRIGHT"))
95 strncpy (as->copyright, ct, FFMIN(sizeof (as->copyright), vl));
96 else if (!strcmp (tt, "DESCRIPTION"))
97 strncpy (as->comment, ct, FFMIN(sizeof (as->comment), vl));
98 else if (!strcmp (tt, "GENRE"))
99 strncpy (as->genre, ct, FFMIN(sizeof (as->genre), vl));
100 else if (!strcmp (tt, "TRACKNUMBER"))
101 as->track = atoi (ct);
102 //Too bored to add others for today
103 }
104 }
105
106 if (size > 0)
107 av_log (as, AV_LOG_INFO, "%i bytes of comment header remain\n", size);
108 if (n > 0)
109 av_log (as, AV_LOG_INFO,
110 "truncated comment header, %i comments not found\n", n);
111
112 return 0;
113}
114
115
116/** Parse the vorbis header
117 * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
118 * [vorbis_version] = read 32 bits as unsigned integer | Not used
119 * [audio_channels] = read 8 bit integer as unsigned | Used
120 * [audio_sample_rate] = read 32 bits as unsigned integer | Used
121 * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
122 * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
123 * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
124 * [blocksize_0] = read 4 bits as unsigned integer | Not Used
125 * [blocksize_1] = read 4 bits as unsigned integer | Not Used
126 * [framing_flag] = read one bit | Not Used
127 * */
128
129static int
130vorbis_header (AVFormatContext * s, int idx)
131{
132 ogg_t *ogg = s->priv_data;
133 ogg_stream_t *os = ogg->streams + idx;
134 AVStream *st = s->streams[idx];
135 int cds = st->codec.extradata_size + os->psize + 2;
056f6179 136 uint8_t *cdp;
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137
138 if (os->seq > 2)
139 return 0;
140
141 st->codec.extradata = av_realloc (st->codec.extradata, cds);
142 cdp = st->codec.extradata + st->codec.extradata_size;
143 *cdp++ = os->psize >> 8;
144 *cdp++ = os->psize & 0xff;
145 memcpy (cdp, os->buf + os->pstart, os->psize);
146 st->codec.extradata_size = cds;
147
148 if (os->buf[os->pstart] == 1) {
056f6179 149 uint8_t *p = os->buf + os->pstart + 11; //skip up to the audio channels
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150 st->codec.channels = *p++;
151 st->codec.sample_rate = le2me_32 (unaligned32 (p));
152 p += 8; //skip maximum and and nominal bitrate
153 st->codec.bit_rate = le2me_32 (unaligned32 (p)); //Minimum bitrate
154
155 st->codec.codec_type = CODEC_TYPE_AUDIO;
156 st->codec.codec_id = CODEC_ID_VORBIS;
157
158 } else if (os->buf[os->pstart] == 3) {
159 vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
160 }
161
162 return os->seq < 3;
163}
164
165ogg_codec_t vorbis_codec = {
166 .magic = "\001vorbis",
167 .magicsize = 7,
168 .header = vorbis_header
169};