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
|
/* MPEG audio packet decoder.
* Written by Shaun Jackman <sjackman@gmail.com>.
* Copyright 2007 Shaun Jackman
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/asn1.h>
#include <wsutil/mpeg-audio.h>
#include "packet-per.h"
#include "packet-mpeg-audio-hf.c"
#include "packet-mpeg-audio-ett.c"
#include "packet-mpeg-audio-fn.c"
static int proto_mpeg_audio = -1;
static int hf_mpeg_audio = -1;
static int hf_mpeg_audio_data = -1;
static int hf_mpeg_audio_padbytes = -1;
static int hf_id3v1 = -1;
static int hf_id3v2 = -1;
static gboolean
dissect_mpeg_audio_frame(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint32 h;
struct mpa mpa;
size_t data_size = 0;
asn1_ctx_t asn1_ctx;
int offset = 0;
if (!tvb_bytes_exist(tvb, 0, 4))
return FALSE; /* not enough data for an MPEG audio frame */
h = tvb_get_ntohl(tvb, 0);
MPA_UNMARSHAL(&mpa, h);
if (!MPA_SYNC_VALID(&mpa))
return FALSE;
if (!MPA_VERSION_VALID(&mpa))
return FALSE;
if (!MPA_LAYER_VALID(&mpa))
return FALSE;
if (check_col(pinfo->cinfo, COL_PROTOCOL)) {
static const char *version_names[] = { "1", "2", "2.5" };
col_add_fstr(pinfo->cinfo, COL_PROTOCOL,
"MPEG-%s", version_names[mpa_version(&mpa)]);
}
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO,
"Audio Layer %d", mpa_layer(&mpa) + 1);
if (MPA_BITRATE_VALID(&mpa) && MPA_FREQUENCY_VALID(&mpa)) {
data_size = MPA_DATA_BYTES(&mpa) - sizeof mpa;
if (check_col(pinfo->cinfo, COL_DEF_SRC)) {
SET_ADDRESS(&pinfo->src, AT_NONE, 0, NULL);
col_add_fstr(pinfo->cinfo, COL_DEF_SRC,
"%d kb/s", mpa_bitrate(&mpa) / 1000);
}
if (check_col(pinfo->cinfo, COL_DEF_DST)) {
SET_ADDRESS(&pinfo->dst, AT_NONE, 0, NULL);
col_add_fstr(pinfo->cinfo, COL_DEF_DST,
"%g kHz", mpa_frequency(&mpa) / (float)1000);
}
}
if (tree == NULL)
return TRUE;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
offset = dissect_mpeg_audio_Audio(tvb, offset, &asn1_ctx,
tree, hf_mpeg_audio);
if (data_size > 0) {
unsigned int padding;
proto_tree_add_item(tree, hf_mpeg_audio_data, tvb,
offset / 8, data_size, FALSE);
offset += data_size * 8;
padding = mpa_padding(&mpa);
if (padding > 0) {
proto_tree_add_item(tree, hf_mpeg_audio_padbytes, tvb,
offset / 8, padding, FALSE);
offset += padding * 8;
}
}
return TRUE;
}
static void
dissect_id3v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
asn1_ctx_t asn1_ctx;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ID3v1");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
if (tree == NULL)
return;
asn1_ctx_init(&asn1_ctx, ASN1_ENC_PER, TRUE, pinfo);
dissect_mpeg_audio_ID3v1(tvb, 0, &asn1_ctx,
tree, hf_id3v1);
}
static void
dissect_id3v2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ID3v2");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
proto_tree_add_item(tree, hf_id3v2, tvb,
0, -1, FALSE);
}
static gboolean
dissect_mpeg_audio(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int magic;
if (!tvb_bytes_exist(tvb, 0, 3))
return FALSE; /* not enough data for an ID tag or audio frame */
magic = tvb_get_ntoh24(tvb, 0);
switch (magic) {
case 0x544147: /* TAG */
dissect_id3v1(tvb, pinfo, tree);
return TRUE;
case 0x494433: /* ID3 */
dissect_id3v2(tvb, pinfo, tree);
return TRUE;
default:
return dissect_mpeg_audio_frame(tvb, pinfo, tree);
}
}
void
proto_register_mpeg_audio(void)
{
static hf_register_info hf[] = {
#include "packet-mpeg-audio-hfarr.c"
{ &hf_mpeg_audio,
{ "MPEG Audio", "mpeg.audio",
FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }},
{ &hf_mpeg_audio_data,
{ "Data", "mpeg.audio.data",
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
{ &hf_mpeg_audio_padbytes,
{ "Padding", "mpeg.audio.padbytes",
FT_BYTES, BASE_NONE, NULL, 0, NULL, HFILL }},
{ &hf_id3v1,
{ "ID3v1", "id3v1",
FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }},
{ &hf_id3v2,
{ "ID3v2", "id3v2",
FT_NONE, BASE_NONE, NULL, 0, NULL, HFILL }},
};
static gint *ett[] = {
#include "packet-mpeg-audio-ettarr.c"
};
proto_mpeg_audio = proto_register_protocol(
"Moving Picture Experts Group Audio", "MPEG Audio", "mpeg.audio");
proto_register_field_array(proto_mpeg_audio, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_mpeg_audio(void)
{
heur_dissector_add("mpeg", dissect_mpeg_audio, proto_mpeg_audio);
}
|
