packet-slimp3.c

   1 /* packet-slimp3.c
   2  * Routines for SliMP3 protocol dissection
   3  *
   4  * Ashok Narayanan <ashokn@cisco.com>
   5  *
   6  * Adds support for the data packet protocol for the SliMP3
   7  * See www.slimdevices.com for details.
   8  *
   9  * $Id: packet-slimp3.c,v 1.1 2001/12/27 05:24:20 ashokn Exp $
  10  *
  11  * Ethereal - Network traffic analyzer
  12  * By Gerald Combs <gerald@ethereal.com>
  13  * Copyright 1998 Gerald Combs
  14  *
  15  * This program is free software; you can redistribute it and/or
  16  * modify it under the terms of the GNU General Public License
  17  * as published by the Free Software Foundation; either version 2
  18  * of the License, or (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #ifdef HAVE_SYS_TYPES_H
  35 # include <sys/types.h>
  36 #endif
  37
  38 #ifdef HAVE_NETINET_IN_H
  39 # include <netinet/in.h>
  40 #endif
  41
  42 #include <glib.h>
  43 #include "packet.h"
  44 #include "conversation.h"
  45
  46 static int proto_slimp3 = -1;
  47 static int hf_slimp3_opcode = -1;
  48 static int hf_slimp3_ir = -1;
  49 static int hf_slimp3_display = -1;
  50 static int hf_slimp3_control = -1;
  51 static int hf_slimp3_hello = -1;
  52 static int hf_slimp3_i2c = -1;
  53 static int hf_slimp3_data_request = -1;
  54 static int hf_slimp3_data = -1;
  55 static int hf_slimp3_discover_request = -1;
  56 static int hf_slimp3_discover_response = -1;
  57
  58 static gint ett_slimp3 = -1;
  59
  60 static dissector_handle_t slimp3_handle;
  61
  62 #define UDP_PORT_SLIMP3    1069
  63
  64 #define SLIMP3_IR       'i'
  65 #define SLIMP3_CONTROL  's'
  66 #define SLIMP3_HELLO    'h'
  67 #define SLIMP3_DATA     'm'
  68 #define SLIMP3_DATA_REQ 'r'
  69 #define SLIMP3_DISPLAY  'l'
  70 #define SLIMP3_I2C      '2'
  71 #define SLIMP3_DISC_REQ 'd'
  72 #define SLIMP3_DISC_RSP 'D'
  73
  74 static const value_string slimp3_opcode_vals[] = {
  75   { SLIMP3_IR,       "Infrared Remote Code" },
  76   { SLIMP3_CONTROL,  "Stream Control" },
  77   { SLIMP3_DATA,     "MPEG Data" },
  78   { SLIMP3_DATA_REQ, "Data Request" },
  79   { SLIMP3_HELLO,    "Hello" },
  80   { SLIMP3_DISPLAY,  "Display" },
  81   { SLIMP3_I2C,      "I2C" },
  82   { SLIMP3_DISC_REQ, "Discovery Request" },
  83   { SLIMP3_DISC_RSP, "Discovery Response" },
  84   { 0,               NULL }
  85 };
  86
  87 static const value_string slimp3_ir_codes_jvc[] = {
  88     { 0xf786, "One" },
  89     { 0xf746, "Two" },
  90     { 0xf7c6, "Three" },
  91     { 0xf726, "Four" },
  92     { 0xf7a6, "Five" },
  93     { 0xf766, "Six" },
  94     { 0xf7e6, "Seven" },
  95     { 0xf716, "Eight" },
  96     { 0xf796, "Nine" },
  97     { 0xf776, "Ten" },
  98
  99     { 0xf7f6, "Picture-In-Picture" },
 100     /* { 0xf7XX, "Enter" }, */
 101     { 0xf70e, "Back" },
 102     { 0xf732, "Play" },
 103     { 0xf76e, "Forward" },
 104     { 0xf743, "Record" },
 105     { 0xf7c2, "Stop" },
 106     { 0xf7b2, "Pause" },
 107     /* { 0xf7XX, "TV/Video" }, */
 108     { 0xf703, "Display" },
 109     { 0xf7b3, "Sleep" },
 110     { 0xf7b6, "Guide" },
 111     { 0xf70b, "Up" },
 112     { 0xf74b, "Left" },
 113     { 0xf7cb, "Right" },
 114     { 0xf78b, "Down" },
 115     { 0xf783, "Menu" },
 116     { 0xf72b, "OK" },
 117     { 0xf778, "Volume Up" },
 118     { 0xf7f8, "Volume Down" },
 119     { 0xf70d, "Channel Up" },
 120     { 0xf78d, "Channel Down" },
 121     /* { 0xf7XX, "Mute" },  */
 122     { 0xf7ab, "Recall" },
 123     { 0xf702, "Power" },
 124 };
 125
 126 static const value_string slimp3_display_commands[] = {
 127     {  0x1, "Clear Display"},
 128     {  0x2, "Cursor to 1st Line Home"},
 129
 130     {  0x4, "Mode: Decrement Address, Shift Cursor"},
 131     {  0x5, "Mode: Decrement Address, Shift Display"},
 132     {  0x6, "Mode: Increment Address, Shift Cursor"},
 133     {  0x7, "Mode: Increment Address, Shift Display"},
 134
 135     {  0x8, "Display Off"},
 136     {  0xd, "Display On, With Blinking"},
 137     {  0xe, "Display On, With Cursor"},
 138     {  0xf, "Display On, With Cursor And Blinking"},
 139
 140     { 0x10, "Move Cursor Left"},
 141     { 0x14, "Move Cursor Right"},
 142     { 0x18, "Shift Display Left"},
 143     { 0x1b, "Shift Display Right"},
 144
 145     { 0x30, "Set (8-bit)"},
 146     { 0x20, "Set (4-bit)"},
 147
 148     { 0xa0, "Cursor to Top Right"},
 149     { 0xc0, "Cursor to 2nd Line Home"},
 150
 151     {    0, NULL},
 152 };
 153
 154 static const value_string slimp3_display_fset8[] = {
 155     { 0x0, "Brightness 100%"},
 156     { 0x1, "Brightness 75%"},
 157     { 0x2, "Brightness 50%"},
 158     { 0x3, "Brightness 25%"},
 159
 160     {   0, NULL },
 161 };
 162
 163 static const value_string slimp3_stream_control[] = {
 164     { 1, "Reset buffer, Start New Stream"},
 165     { 2, "Pause Playback"},
 166     { 4, "Resume Playback"},
 167     {   0, NULL },
 168 };
 169
 170 static void
 171 dissect_slimp3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 172 {
 173     proto_tree  *slimp3_tree = NULL;
 174     proto_tree  *el_tree = NULL;
 175     proto_item  *ti = NULL;
 176     conversation_t  *conversation;
 177     gint                i1;
 178     gint                offset = 0;
 179     guint16             opcode;
 180     guint16         error;
 181     guint32      i;
 182     guint8       subcode;
 183     char addc_str[101];
 184     char *addc_strp;
 185
 186
 187     if (check_col(pinfo->cinfo, COL_PROTOCOL))
 188         col_set_str(pinfo->cinfo, COL_PROTOCOL, "SliMP3");
 189
 190     opcode = tvb_get_guint8(tvb, offset);
 191
 192     if (check_col(pinfo->cinfo, COL_INFO)) {
 193
 194         col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
 195                      val_to_str(opcode, slimp3_opcode_vals, "Unknown (%c)"));
 196
 197     }
 198
 199     addc_strp = addc_str;
 200     if (tree) {
 201
 202         ti = proto_tree_add_item(tree, proto_slimp3, tvb, offset,
 203                                  tvb_length_remaining(tvb, offset), FALSE);
 204         slimp3_tree = proto_item_add_subtree(ti, ett_slimp3);
 205
 206         proto_tree_add_uint(slimp3_tree, hf_slimp3_opcode, tvb,
 207                             offset, 1, opcode);
 208     }
 209     switch (opcode) {
 210
 211     case SLIMP3_IR:
 212         if (tree) {
 213             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_ir, tvb, offset+8, 4, FALSE);
 214
 215             i1 = tvb_get_ntohl(tvb, offset+2);
 216             proto_tree_add_text(slimp3_tree, tvb, offset+2, 4, "Uptime: %u sec (%u ticks)",
 217                                 i1/625000, i1);
 218             proto_tree_add_text(slimp3_tree, tvb, offset+6, 1, "Code identifier: 0x%0x: %s",
 219                                 tvb_get_guint8(tvb, offset+6),
 220                                 tvb_get_guint8(tvb, offset+6)==0xff ? "JVC DVD Player" : "Unknown");
 221             proto_tree_add_text(slimp3_tree, tvb, offset+7, 1, "Code bits: %d",
 222                                 tvb_get_guint8(tvb, offset+7));
 223
 224             i1 = tvb_get_ntohl(tvb, offset+8);
 225             /* Is this a standard JVC remote code? */
 226             if (tvb_get_guint8(tvb, offset+6) == 0xff &&
 227                 tvb_get_guint8(tvb, offset+7) == 16) {
 228
 229                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4,
 230                                     "Infrared Code: %s: 0x%0x",
 231                                     val_to_str(i1, slimp3_ir_codes_jvc, "Unknown"),
 232                                     tvb_get_ntohl(tvb, offset+8));
 233             } else {
 234                 /* Unknown code; just write it */
 235                 proto_tree_add_text(slimp3_tree, tvb, offset+8, 4, "Infrared Code: 0x%0x",
 236                                     tvb_get_ntohl(tvb, offset+8));
 237             }
 238         }
 239         if (check_col(pinfo->cinfo, COL_INFO)) {
 240             i1 = tvb_get_ntohl(tvb, offset+8);
 241             if (tvb_get_guint8(tvb, offset+6) == 0xff &&
 242                 tvb_get_guint8(tvb, offset+7) == 16) {
 243                 col_append_fstr(pinfo->cinfo, COL_INFO, ", JVC: %s",
 244                                 val_to_str(i1, slimp3_ir_codes_jvc, "Unknown (0x%0x)"));
 245             } else {
 246                 /* Unknown code; just write it */
 247                 col_append_fstr(pinfo->cinfo, COL_INFO, ", 0x%0x", i1);
 248             }
 249         }
 250         break;
 251
 252     case SLIMP3_DISPLAY:
 253         if (tree) {
 254             int in_str;
 255
 256             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_display,
 257                                        tvb, offset, 1, FALSE);
 258
 259             /* Loop through the commands */
 260             i1 = 18;
 261             in_str = 0;
 262             while (i1 < tvb_length_remaining(tvb, offset)) {
 263                 switch(tvb_get_guint8(tvb, offset + i1)) {
 264                 case 0:
 265                     in_str = 0;
 266                     proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 267                                         "Delay (%d ms)", tvb_get_guint8(tvb, offset + i1 + 1));
 268                     i1 += 2;
 269                     break;
 270                 case 3:
 271                     if (ti && in_str) {
 272                         proto_item_append_text(ti, "%c",
 273                                                tvb_get_guint8(tvb, offset + i1 + 1));
 274                     } else {
 275                         ti = proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 276                                                  "String: %c",
 277                                                  tvb_get_guint8(tvb, offset + i1 + 1));
 278                         in_str = 1;
 279                     }
 280                     i1 += 2;
 281                     break;
 282
 283                 case 2:
 284                     in_str = 0;
 285                     ti = proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 286                                              "Command: %s",
 287                                              val_to_str(tvb_get_guint8(tvb, offset + i1 + 1),
 288                                                         slimp3_display_commands,
 289                                                         "Unknown (0x%0x)"));
 290                     if ((tvb_get_guint8(tvb, offset + i1 + 1) & 0xf0) == 0x30) {
 291                         proto_item_append_text(ti, ": %s",
 292                                                val_to_str(tvb_get_guint8(tvb, offset + i1 + 2),
 293                                                           slimp3_display_fset8,
 294                                                           "Unknown (0x%0x)"));
 295                         i1 += 2 ;
 296                     }
 297                     i1 += 2;
 298                     break;
 299
 300                 default:
 301                     proto_tree_add_text(slimp3_tree, tvb, offset + i1, 2,
 302                                         "Unknown 0x%0x, 0x%0x",
 303                                         tvb_get_guint8(tvb, offset + i1),
 304                                         tvb_get_guint8(tvb, offset + i1 + 1));
 305                     i1 += 2;
 306                     break;
 307                 }
 308             }
 309         }
 310
 311         if (check_col(pinfo->cinfo, COL_INFO)) {
 312             i1 = 18;
 313             addc_strp = addc_str;
 314             while (i1 < tvb_length_remaining(tvb, offset)) {
 315                 switch(tvb_get_guint8(tvb, offset + i1)) {
 316                 case 0: *addc_strp++ = '.'; break;
 317                 case 2: *addc_strp++ = '|';
 318                     if ((tvb_get_guint8(tvb, offset + i1 + 1) & 0xf0) == 0x30) i1+=2;
 319                     break;
 320                 case 3:
 321                     if (addc_strp==addc_str ||
 322                         *(addc_strp-1)!=' ' ||
 323                         tvb_get_guint8(tvb, offset + i1 + 1) != ' ')
 324                         *addc_strp++ = tvb_get_guint8(tvb, offset + i1 + 1);
 325                 }
 326                 i1+=2;
 327             }
 328             *addc_strp = 0;
 329             if (addc_strp - addc_str > 0)
 330             col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", addc_str);
 331         }
 332
 333         break;
 334
 335     case SLIMP3_CONTROL:
 336         if (tree) {
 337             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_control,
 338                                        tvb, offset+1, 1, FALSE);
 339             proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Command: %s",
 340                                 val_to_str(tvb_get_guint8(tvb, offset+1),
 341                                            slimp3_stream_control, "Unknown (0x%0x)"));
 342         }
 343
 344         if (check_col(pinfo->cinfo, COL_INFO)) {
 345             col_append_fstr(pinfo->cinfo, COL_INFO, ", %s",
 346                             val_to_str(tvb_get_guint8(tvb, offset+1),
 347                                        slimp3_stream_control, "Unknown (0x%0x)"));
 348         }
 349         break;
 350
 351     case SLIMP3_HELLO:
 352         if (tree) {
 353             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_hello,
 354                                        tvb, offset+1, 1, FALSE);
 355             if (pinfo->destport == UDP_PORT_SLIMP3) {
 356                 guint8 fw_ver = 0;
 357                 /* Hello response; client->server */
 358                 proto_tree_add_text(slimp3_tree, tvb, offset, 1, "Hello Response (Client --> Server)");
 359                 proto_tree_add_text(slimp3_tree, tvb, offset+1, 1, "Device ID: %d",
 360                                     tvb_get_guint8(tvb, offset+1));
 361                 fw_ver = tvb_get_guint8(tvb, offset+2);
 362                 proto_tree_add_text(slimp3_tree, tvb, offset+2, 1, "Firmware Revision: %d.%d (0x%0x)",
 363                                     fw_ver>>4, fw_ver & 0xf, fw_ver);
 364             } else {
 365                 /* Hello request; server->client */
 366                 proto_tree_add_text(slimp3_tree, tvb, offset, 1, "Hello Request (Server --> Client)");
 367             }
 368         }
 369         break;
 370
 371     case SLIMP3_I2C:
 372         if (tree) {
 373             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_i2c,
 374                                        tvb, offset, 1, FALSE);
 375             if (pinfo->destport == UDP_PORT_SLIMP3) {
 376                 /* Hello response; client->server */
 377                 proto_tree_add_text(slimp3_tree, tvb, offset, tvb_length_remaining(tvb, offset),
 378                                     "I2C Response (Client --> Server)");
 379             } else {
 380                 /* Hello request; server->client */
 381                 proto_tree_add_text(slimp3_tree, tvb, offset, tvb_length_remaining(tvb, offset),
 382                                     "I2C Request (Server --> Client)");
 383             }
 384         }
 385
 386         if (check_col(pinfo->cinfo, COL_INFO)) {
 387             if (pinfo->destport == UDP_PORT_SLIMP3) {
 388                 col_append_fstr(pinfo->cinfo, COL_INFO, ", Response");
 389             } else {
 390                 col_append_fstr(pinfo->cinfo, COL_INFO, ", Request");
 391             }
 392         }
 393         break;
 394
 395     case SLIMP3_DATA_REQ:
 396         if (tree) {
 397             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_data_request,
 398                                        tvb, offset, 1, FALSE);
 399             proto_tree_add_text(slimp3_tree, tvb, offset+2, 2,
 400                                 "Requested offset: %d bytes.",
 401                                 tvb_get_ntohs(tvb, offset+2)*2);
 402         }
 403
 404         if (check_col(pinfo->cinfo, COL_INFO)) {
 405             col_append_fstr(pinfo->cinfo, COL_INFO, ", Offset: %d bytes",
 406                             tvb_get_ntohs(tvb, offset+2)*2);
 407         }
 408         break;
 409
 410     case SLIMP3_DATA:
 411         if (tree) {
 412             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_data,
 413                                        tvb, offset, 1, FALSE);
 414             proto_tree_add_text(slimp3_tree, tvb, offset, tvb_length_remaining(tvb, offset),
 415                                 "Length: %d bytes", tvb_length_remaining(tvb, offset+18));
 416             proto_tree_add_text(slimp3_tree, tvb, offset+2, 2,
 417                                 "Buffer offset: %d bytes.",
 418                                 tvb_get_ntohs(tvb, offset+2) * 2);
 419         }
 420
 421         if (check_col(pinfo->cinfo, COL_INFO)) {
 422             col_append_fstr(pinfo->cinfo, COL_INFO, ", Length: %d bytes, Offset: %d bytes.",
 423                             tvb_length_remaining(tvb, offset+18),
 424                             tvb_get_ntohs(tvb, offset+2) * 2);
 425         }
 426         break;
 427
 428     case SLIMP3_DISC_REQ:
 429         if (tree) {
 430             guint8 fw_ver;
 431             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_discover_request,
 432                                        tvb, offset, 1, FALSE);
 433             proto_tree_add_text(slimp3_tree, tvb, offset+1, 1,
 434                                 "Device ID: %d.", tvb_get_guint8(tvb, offset+1));
 435             fw_ver = tvb_get_guint8(tvb, offset+2);
 436             proto_tree_add_text(slimp3_tree, tvb, offset+2, 1, "Firmware Revision: %d.%d (0x%0x)",
 437                                 fw_ver>>4, fw_ver & 0xf, fw_ver);
 438         }
 439
 440         if (check_col(pinfo->cinfo, COL_INFO)) {
 441             guint8 fw_ver = tvb_get_guint8(tvb, offset+2);
 442             col_append_fstr(pinfo->cinfo, COL_INFO, ", Device ID: %d. Firmware: %d.%d",
 443                             tvb_get_guint8(tvb, offset+1), fw_ver>>4, fw_ver & 0xf);
 444         }
 445         break;
 446
 447     case SLIMP3_DISC_RSP:
 448         if (tree) {
 449             guint8 fw_ver;
 450             proto_tree_add_item_hidden(slimp3_tree, hf_slimp3_discover_response,
 451                                        tvb, offset, 1, FALSE);
 452             proto_tree_add_text(slimp3_tree, tvb, offset+2, 4,
 453                                 "Server Address: %s.",
 454                                 ip_to_str(tvb_get_ptr(tvb, offset+2, 4)));
 455             proto_tree_add_text(slimp3_tree, tvb, offset+6, 2,
 456                                 "Server Port: %d", tvb_get_ntohs(tvb, offset + 6));
 457         }
 458
 459         if (check_col(pinfo->cinfo, COL_INFO)) {
 460             guint8 fw_ver = tvb_get_guint8(tvb, offset+2);
 461             col_append_fstr(pinfo->cinfo, COL_INFO, ", Server Address: %s. Server Port: %d",
 462                             ip_to_str(tvb_get_ptr(tvb, offset+2, 4)),
 463                             tvb_get_ntohs(tvb, offset + 6));
 464         }
 465         break;
 466
 467     default:
 468         if (tree) {
 469             proto_tree_add_text(slimp3_tree, tvb, offset, tvb_length_remaining(tvb, offset),
 470                                 "Data (%d bytes)", tvb_length_remaining(tvb, offset));
 471         }
 472         break;
 473
 474     }
 475 }
 476
 477 void
 478 proto_register_slimp3(void)
 479 {
 480   static hf_register_info hf[] = {
 481     { &hf_slimp3_opcode,
 482       { "Opcode",             "slimp3.opcode",
 483         FT_UINT8, BASE_DEC, VALS(slimp3_opcode_vals), 0x0,
 484         "SLIMP3 message type", HFILL }},
 485
 486     { &hf_slimp3_ir,
 487       { "Infrared",           "slimp3.ir",
 488         FT_UINT32, BASE_HEX, NULL, 0x0,
 489         "SLIMP3 Infrared command", HFILL }},
 490
 491     { &hf_slimp3_control,
 492       { "Control Packet",   "slimp3.control",
 493         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 494         "SLIMP3 control", HFILL }},
 495
 496     { &hf_slimp3_display,
 497       { "Display",                    "slimp3.display",
 498         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 499         "SLIMP3 display", HFILL }},
 500
 501     { &hf_slimp3_hello,
 502       { "Hello",                      "slimp3.hello",
 503         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 504         "SLIMP3 hello", HFILL }},
 505
 506     { &hf_slimp3_i2c,
 507       { "I2C",                "slimp3.i2c",
 508         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 509         "SLIMP3 I2C", HFILL }},
 510
 511     { &hf_slimp3_data,
 512       { "Data",              "slimp3.data",
 513         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 514         "SLIMP3 Data", HFILL }},
 515
 516     { &hf_slimp3_data_request,
 517       { "Data Request",      "slimp3.data_req",
 518         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 519         "SLIMP3 Data Request", HFILL }},
 520
 521     { &hf_slimp3_discover_request,
 522       { "Discovery Request", "slimp3.discovery_req",
 523         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 524         "SLIMP3 Discovery Request", HFILL }},
 525
 526     { &hf_slimp3_discover_response,
 527       { "Discovery Response", "slimp3.discovery_response",
 528         FT_BOOLEAN, BASE_DEC, NULL, 0x0,
 529         "SLIMP3 Discovery Response", HFILL }},
 530
 531   };
 532   static gint *ett[] = {
 533     &ett_slimp3,
 534   };
 535
 536   proto_slimp3 = proto_register_protocol("SliMP3 Communication Protocol",
 537                                        "SliMP3", "slimp3");
 538   proto_register_field_array(proto_slimp3, hf, array_length(hf));
 539   proto_register_subtree_array(ett, array_length(ett));
 540
 541   slimp3_handle = create_dissector_handle(dissect_slimp3, proto_slimp3);
 542 }
 543
 544 void
 545 proto_reg_handoff_slimp3(void)
 546 {
 547   dissector_add("udp.port", UDP_PORT_SLIMP3, slimp3_handle);
 548 }