1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/**
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
**/
#include <stdlib.h>
#include "avformat.h"
#include "bitstream.h"
#include "bswap.h"
#include "ogg2.h"
#include "avstring.h"
extern int
vorbis_comment(AVFormatContext * as, uint8_t *buf, int size)
{
char *p = buf;
int s, n, j;
if (size < 4)
return -1;
s = AV_RL32(p);
p += 4;
size -= 4;
if (size < s + 4)
return -1;
p += s;
size -= s;
n = AV_RL32(p);
p += 4;
size -= 4;
while (size >= 4) {
char *t, *v;
int tl, vl;
s = AV_RL32(p);
p += 4;
size -= 4;
if (size < s)
break;
t = p;
p += s;
size -= s;
n--;
v = memchr(t, '=', s);
if (!v)
continue;
tl = v - t;
vl = s - tl - 1;
v++;
if (tl && vl) {
char tt[tl + 1];
char ct[vl + 1];
for (j = 0; j < tl; j++)
tt[j] = toupper(t[j]);
tt[tl] = 0;
memcpy(ct, v, vl);
ct[vl] = 0;
// took from Vorbis_I_spec
if (!strcmp(tt, "AUTHOR") || !strcmp(tt, "ARTIST"))
av_strlcpy(as->author, ct, sizeof(as->author));
else if (!strcmp(tt, "TITLE"))
av_strlcpy(as->title, ct, sizeof(as->title));
else if (!strcmp(tt, "COPYRIGHT"))
av_strlcpy(as->copyright, ct, sizeof(as->copyright));
else if (!strcmp(tt, "DESCRIPTION"))
av_strlcpy(as->comment, ct, sizeof(as->comment));
else if (!strcmp(tt, "GENRE"))
av_strlcpy(as->genre, ct, sizeof(as->genre));
else if (!strcmp(tt, "TRACKNUMBER"))
as->track = atoi(ct);
else if (!strcmp(tt, "ALBUM"))
av_strlcpy(as->album, ct, sizeof(as->album));
}
}
if (size > 0)
av_log(as, AV_LOG_INFO, "%i bytes of comment header remain\n", size);
if (n > 0)
av_log(as, AV_LOG_INFO,
"truncated comment header, %i comments not found\n", n);
return 0;
}
/** Parse the vorbis header
* Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
* [vorbis_version] = read 32 bits as unsigned integer | Not used
* [audio_channels] = read 8 bit integer as unsigned | Used
* [audio_sample_rate] = read 32 bits as unsigned integer | Used
* [bitrate_maximum] = read 32 bits as signed integer | Not used yet
* [bitrate_nominal] = read 32 bits as signed integer | Not used yet
* [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
* [blocksize_0] = read 4 bits as unsigned integer | Not Used
* [blocksize_1] = read 4 bits as unsigned integer | Not Used
* [framing_flag] = read one bit | Not Used
* */
typedef struct {
unsigned int len[3];
unsigned char *packet[3];
} oggvorbis_private_t;
static unsigned int
fixup_vorbis_headers(AVFormatContext * as, oggvorbis_private_t *priv,
uint8_t **buf)
{
int i,offset, len;
unsigned char *ptr;
len = priv->len[0] + priv->len[1] + priv->len[2];
ptr = *buf = av_mallocz(len + len/255 + 64);
ptr[0] = 2;
offset = 1;
offset += av_xiphlacing(&ptr[offset], priv->len[0]);
offset += av_xiphlacing(&ptr[offset], priv->len[1]);
for (i = 0; i < 3; i++) {
memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
offset += priv->len[i];
}
*buf = av_realloc(*buf, offset);
return offset;
}
static int
vorbis_header (AVFormatContext * s, int idx)
{
ogg_t *ogg = s->priv_data;
ogg_stream_t *os = ogg->streams + idx;
AVStream *st = s->streams[idx];
oggvorbis_private_t *priv;
if (os->seq > 2)
return 0;
if (os->seq == 0) {
os->private = av_mallocz(sizeof(oggvorbis_private_t));
if (!os->private)
return 0;
}
priv = os->private;
priv->len[os->seq] = os->psize;
priv->packet[os->seq] = av_mallocz(os->psize);
memcpy(priv->packet[os->seq], os->buf + os->pstart, os->psize);
if (os->buf[os->pstart] == 1) {
uint8_t *p = os->buf + os->pstart + 11; //skip up to the audio channels
st->codec->channels = *p++;
st->codec->sample_rate = AV_RL32(p);
p += 8; //skip maximum and and nominal bitrate
st->codec->bit_rate = AV_RL32(p); //Minimum bitrate
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_VORBIS;
st->time_base.num = 1;
st->time_base.den = st->codec->sample_rate;
} else if (os->buf[os->pstart] == 3) {
vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
} else {
st->codec->extradata_size =
fixup_vorbis_headers(s, priv, &st->codec->extradata);
}
return os->seq < 3;
}
ogg_codec_t vorbis_codec = {
.magic = "\001vorbis",
.magicsize = 7,
.header = vorbis_header
};
|
