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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
|
/* packet-h264.c
* Routines for H.264 dissection
* Copyright 2007, Anders Broman <anders.broman[at]ericsson.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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.
*
* References:
* http://www.ietf.org/rfc/rfc3984.txt?number=3984
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/proto.h>
#include "prefs.h"
/* Initialize the protocol and registered fields */
static int proto_h264 = -1;
static int hf_h264_nal_unit_type = -1;
static int hf_h264_nal_f_bit = -1;
static int hf_h264_nal_nri = -1;
static int hf_h264_profile = -1;
static int hf_h264_profile_idc = -1;
static int hf_h264_constraint_set0_flag = -1;
static int hf_h264_constraint_set1_flag = -1;
static int hf_h264_constraint_set2_flag = -1;
static int hf_h264_constraint_set3_flag = -1;
static int hf_h264_reserved_zero_4bits = -1;
static int hf_h264_level_idc = -1;
/* Initialize the subtree pointers */
static int ett_h264 = -1;
static int ett_h264_profile = -1;
static int ett_h264_nal = -1;
/* The dynamic payload type which will be dissected as H.264 */
static guint dynamic_payload_type = 0;
static guint temp_dynamic_payload_type = 0;
static const true_false_string h264_f_bit_vals = {
"Bit errors or other syntax violations",
"No bit errors or other syntax violations"
};
static const value_string h264_nal_unit_type_values[] = {
{ 0, "Undefined" },
{ 1, "NAL unit" }, /* Single NAL unit packet per H.264 */
{ 2, "NAL unit" },
{ 3, "NAL unit" },
{ 4, "NAL unit" },
{ 5, "NAL unit" },
{ 6, "NAL unit" },
{ 7, "NAL unit" },
{ 8, "NAL unit" },
{ 9, "NAL unit" },
{ 10, "NAL unit" },
{ 11, "NAL unit" }, /* Single NAL unit packet per H.264 */
{ 12, "NAL unit" },
{ 13, "NAL unit" },
{ 14, "NAL unit" },
{ 15, "NAL unit" },
{ 16, "NAL unit" },
{ 17, "NAL unit" },
{ 18, "NAL unit" },
{ 19, "NAL unit" },
{ 20, "NAL unit" },
{ 21, "NAL unit" }, /* Single NAL unit packet per H.264 */
{ 22, "NAL unit" },
{ 23, "NAL unit" },
{ 24, "STAP-A" }, /* Single-time aggregation packet */
{ 25, "STAP-B" }, /* Single-time aggregation packet */
{ 26, "MTAP16" }, /* Multi-time aggregation packet */
{ 27, "MTAP24" }, /* Multi-time aggregation packet */
{ 28, "FU-A" }, /* Fragmentation unit */
{ 29, "FU-B" }, /* Fragmentation unit */
{ 30, "undefined" },
{ 31, "undefined" },
{ 0, NULL }
};
static const value_string h264_profile_idc_values[] = {
{ 66, "Baseline profile" },
{ 77, "Main profile" },
{ 88, "Extended profile" },
{ 100, "High profile" },
{ 110, "High 10 profile" },
{ 122, "High 4:2:2 profile" },
{ 144, "High 4:4:4 profile" },
{ 0, NULL }
};
void
dissect_h264_profile(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
{
proto_item *item;
proto_tree *h264_profile_tree;
gint offset = 0;
item = proto_tree_add_item(tree, hf_h264_profile, tvb, offset, -1, FALSE);
h264_profile_tree = proto_item_add_subtree(item, ett_h264_profile);
proto_tree_add_item(h264_profile_tree, hf_h264_profile_idc, tvb, offset, 1, FALSE);
offset++;
proto_tree_add_item(h264_profile_tree, hf_h264_constraint_set0_flag, tvb, offset, 1, FALSE);
proto_tree_add_item(h264_profile_tree, hf_h264_constraint_set1_flag, tvb, offset, 1, FALSE);
proto_tree_add_item(h264_profile_tree, hf_h264_constraint_set2_flag, tvb, offset, 1, FALSE);
proto_tree_add_item(h264_profile_tree, hf_h264_constraint_set3_flag, tvb, offset, 1, FALSE);
proto_tree_add_item(h264_profile_tree, hf_h264_reserved_zero_4bits, tvb, offset, 1, FALSE);
offset++;
/* A level to which the bitstream conforms shall be indicated by the syntax element level_idc as follows.
* If level_idc is equal to 9, the indicated level is level 1b.
* Otherwise (level_idc is not equal to 9), level_idc shall be set equal to a value of ten times the level number
* specified in Table A-1.
*/
proto_tree_add_item(h264_profile_tree, hf_h264_level_idc, tvb, offset, 1, FALSE);
}
/* Code to actually dissect the packets */
static void
dissect_h264(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
int offset = 0;
proto_item *item, *ti;
proto_tree *h264_tree, *h264_nal_tree;
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "H264");
if (tree) {
item = proto_tree_add_item(tree, proto_h264, tvb, 0, -1, FALSE);
h264_tree = proto_item_add_subtree(item, ett_h264);
ti = proto_tree_add_text(h264_tree, tvb, offset, 1, "NAL unit header or first byte of the payload");
h264_nal_tree = proto_item_add_subtree(item, ett_h264_nal);
/* +---------------+
* |0|1|2|3|4|5|6|7|
* +-+-+-+-+-+-+-+-+
* |F|NRI| Type |
* +---------------+
*/
/* F: 1 bit
* forbidden_zero_bit. A value of 0 indicates that the NAL unit type
* octet and payload should not contain bit errors or other syntax
* violations. A value of 1 indicates that the NAL unit type octet
* and payload may contain bit errors or other syntax violations.
*/
proto_tree_add_item(h264_nal_tree, hf_h264_nal_f_bit, tvb, offset, 1, FALSE);
proto_tree_add_item(h264_nal_tree, hf_h264_nal_nri, tvb, offset, 1, FALSE);
proto_tree_add_item(h264_nal_tree, hf_h264_nal_unit_type, tvb, offset, 1, FALSE);
offset++;
proto_tree_add_text(h264_tree, tvb, offset, -1, "H264 bitstream");
}/* if tree */
}
/* Register the protocol with Wireshark */
/* If this dissector uses sub-dissector registration add a registration routine.
This format is required because a script is used to find these routines and
create the code that calls these routines.
*/
void
proto_reg_handoff_h264(void)
{
dissector_handle_t h264_handle;
static int h264_prefs_initialized = FALSE;
h264_handle = create_dissector_handle(dissect_h264, proto_h264);
if (!h264_prefs_initialized) {
h264_prefs_initialized = TRUE;
}
else {
if ( dynamic_payload_type > 95 )
dissector_delete("rtp.pt", dynamic_payload_type, h264_handle);
}
dynamic_payload_type = temp_dynamic_payload_type;
if ( dynamic_payload_type > 95 ){
dissector_add("rtp.pt", dynamic_payload_type, h264_handle);
}
dissector_add_string("rtp_dyn_payload_type","H264", h264_handle);
}
/* this format is require because a script is used to build the C function
that calls all the protocol registration.
*/
void
proto_register_h264(void)
{
module_t *h264_module;
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_h264_nal_f_bit,
{ "F bit", "h264.f",
FT_BOOLEAN, 8, TFS(&h264_f_bit_vals), 0x80,
"F bit", HFILL }
},
{ &hf_h264_nal_nri,
{ "Nal_ref_idc (NRI)", "h264.nal_nri",
FT_UINT8, BASE_DEC, NULL, 0x60,
"NRI", HFILL }
},
{ &hf_h264_nal_unit_type,
{ "NAL unit type", "h264.nal_unit_hdr",
FT_UINT8, BASE_DEC, VALS(h264_nal_unit_type_values), 0x1f,
"NAL unit type", HFILL }
},
{ &hf_h264_profile,
{ "Profile", "h264.profile",
FT_BYTES, BASE_NONE, NULL, 0x0,
"Profile", HFILL }
},
{ &hf_h264_profile_idc,
{ "Profile_idc", "h264.profile_idc",
FT_UINT8, BASE_DEC, VALS(h264_profile_idc_values), 0x0,
"Profile_idc", HFILL }
},
{ &hf_h264_constraint_set0_flag,
{ "Constraint_set0_flag", "h264.constraint_set0_flag",
FT_UINT8, BASE_DEC, NULL, 0x01,
"Constraint_set0_flag", HFILL }
},
{ &hf_h264_constraint_set1_flag,
{ "Constraint_set1_flag", "h264.constraint_set1_flag",
FT_UINT8, BASE_DEC, NULL, 0x02,
"Constraint_set1_flag", HFILL }
},
{ &hf_h264_constraint_set2_flag,
{ "Constraint_set1_flag", "h264.constraint_set2_flag",
FT_UINT8, BASE_DEC, NULL, 0x04,
"NRI", HFILL }
},
{ &hf_h264_constraint_set3_flag,
{ "Constraint_set3_flag", "h264.constraint_set3_flag",
FT_UINT8, BASE_DEC, NULL, 0x08,
"Constraint_set3_flag", HFILL }
},
{ &hf_h264_reserved_zero_4bits,
{ "Reserved_zero_4bits", "h264.reserved_zero_4bits",
FT_UINT8, BASE_DEC, NULL, 0xf0,
"Reserved_zero_4bits", HFILL }
},
{ &hf_h264_level_idc,
{ "Level_id", "h264.level_id",
FT_UINT8, BASE_DEC, NULL, 0x0,
"Level_id", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_h264,
&ett_h264_profile,
&ett_h264_nal,
};
/* Register the protocol name and description */
proto_h264 = proto_register_protocol("H.264","H264", "h264");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_h264, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register a configuration option for port */
h264_module = prefs_register_protocol(proto_h264, proto_reg_handoff_h264);
prefs_register_uint_preference(h264_module, "dynamic.payload.type",
"H264 dynamic payload type",
"The dynamic payload type which will be interpreted as H264",
10,
&temp_dynamic_payload_type);
register_dissector("h264", dissect_h264, proto_h264);
}
|
