forked from osmocom/wireshark
248 lines
6.8 KiB
C
248 lines
6.8 KiB
C
/* packet-amr.c
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* Routines for AMR dissection
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* Copyright 2005, Anders Broman <anders.broman[at]ericsson.com>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* References:
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* RFC 3267
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* http://www.ietf.org/rfc/rfc3267.txt?number=3267
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "prefs.h"
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/* Initialize the protocol and registered fields */
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static int proto_amr = -1;
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static int hf_amr_cmr = -1;
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static int hf_amr_reserved = -1;
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static int hf_amr_toc_f = -1;
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static int hf_amr_toc_ft = -1;
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static int hf_amr_toc_q = -1;
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/* Initialize the subtree pointers */
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static int ett_amr = -1;
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static int ett_amr_toc = -1;
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/* The dynamic payload type which will be dissected as AMR */
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static guint dynamic_payload_type = 0;
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static guint temp_dynamic_payload_type = 0;
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/* Currently only octet aligned works */
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static gboolean octet_aligned = TRUE;
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static const value_string amr_codec_mode_request_vals[] = {
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{0, "AMR 4,75 kbit/s"},
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{1, "AMR 5,15 kbit/s"},
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{2, "AMR 5,90 kbit/s"},
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{3, "AMR 6,70 kbit/s (PDC-EFR)"},
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{4, "AMR 7,40 kbit/s (TDMA-EFR)"},
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{5, "AMR 7,95 kbit/s"},
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{6, "AMR 10,2 kbit/s"},
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{7, "AMR 12,2 kbit/s (GSM-EFR)"},
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{8, "AMR SID"},
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{9, "GSM-EFR SID"},
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{10, "TDMA-EFR SID"},
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{11, "PDC-EFR SID"},
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/*
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{12-14 - - For future use
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*/
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{15, "No Data (No transmission/No reception)"},
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{ 0, NULL }
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};
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static const true_false_string toc_f_bit_vals = {
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"Followed by another speech frame",
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"Last frame in this payload"
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};
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static const true_false_string toc_q_bit_vals = {
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"Ok",
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"Severely damaged frame"
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};
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/* Code to actually dissect the packets */
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static void
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dissect_amr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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int toc_offset = 0;
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guint octet;
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/* Set up structures needed to add the protocol subtree and manage it */
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proto_item *ti,*toc_item;
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proto_tree *amr_tree, *toc_tree;
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/* Make entries in Protocol column and Info column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "AMR");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_amr, tvb, 0, -1, FALSE);
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amr_tree = proto_item_add_subtree(ti, ett_amr);
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/* add an item to the subtree, see section 1.6 for more information */
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proto_tree_add_item(amr_tree, hf_amr_cmr, tvb, offset, 1, FALSE);
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if ( !octet_aligned )
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return; /* only handle octet aligned for now */
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proto_tree_add_item(amr_tree, hf_amr_reserved, tvb, offset, 1, FALSE);
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offset++;
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toc_offset = offset;
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/* If interleaced ILL and ILP follows here */
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/* Payload Table of Contents
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* A ToC entry takes the following format in octet-aligned mode:
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*
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* 0 1 2 3 4 5 6 7
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* +-+-+-+-+-+-+-+-+
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* |F| FT |Q|P|P|
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* +-+-+-+-+-+-+-+-+
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*/
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octet = tvb_get_guint8(tvb,offset);
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toc_item = proto_tree_add_text(amr_tree, tvb, offset, -1, "Payload Table of Contents");
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toc_tree = proto_item_add_subtree(toc_item, ett_amr_toc);
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while ( ( octet& 0x80 ) == 0x80 ){
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octet = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(amr_tree, hf_amr_toc_f, tvb, offset, 1, FALSE);
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proto_tree_add_item(amr_tree, hf_amr_toc_ft, tvb, offset, 1, FALSE);
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proto_tree_add_item(amr_tree, hf_amr_toc_q, tvb, offset, 1, FALSE);
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offset++;
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}
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/* Continue adding tree items to process the packet here */
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}/* if tree */
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/* If this protocol has a sub-dissector call it here, see section 1.8 */
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}
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/* Register the protocol with Ethereal */
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/* If this dissector uses sub-dissector registration add a registration routine.
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This format is required because a script is used to find these routines and
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create the code that calls these routines.
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*/
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void
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proto_reg_handoff_amr(void)
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{
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dissector_handle_t amr_handle;
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static int amr_prefs_initialized = FALSE;
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amr_handle = create_dissector_handle(dissect_amr, proto_amr);
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if (!amr_prefs_initialized) {
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amr_prefs_initialized = TRUE;
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}
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else {
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if ( dynamic_payload_type > 95 )
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dissector_delete("rtp.pt", dynamic_payload_type, amr_handle);
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}
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dynamic_payload_type = temp_dynamic_payload_type;
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if ( dynamic_payload_type > 95 ){
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dissector_add("rtp.pt", dynamic_payload_type, amr_handle);
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}
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dissector_add_string("rtp_dyn_payload_type","amr", amr_handle);
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}
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/* this format is require because a script is used to build the C function
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that calls all the protocol registration.
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*/
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void
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proto_register_amr(void)
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{
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module_t *amr_module;
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_amr_cmr,
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{ "CMR", "amr.cmr",
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FT_UINT8, BASE_DEC, VALS(amr_codec_mode_request_vals), 0xf0,
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"codec mode request", HFILL }
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},
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{ &hf_amr_reserved,
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{ "Reserved", "amr.reserved",
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FT_UINT8, BASE_DEC, NULL, 0x0f,
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"Reserved bits", HFILL }
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},
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{ &hf_amr_toc_f,
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{ "F bit", "amr.toc.f",
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FT_BOOLEAN, 8, TFS(&toc_f_bit_vals), 0x80,
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"F bit", HFILL }
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},
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{ &hf_amr_toc_ft,
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{ "FT bits", "amr.toc.ft",
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FT_UINT8, BASE_DEC, VALS(amr_codec_mode_request_vals), 0x78,
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"FT bits", HFILL }
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},
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{ &hf_amr_toc_q,
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{ "Q bit", "amr.toc.q",
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FT_BOOLEAN, 8, TFS(&toc_q_bit_vals), 0x04,
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"Frame quality indicator bit", HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_amr,
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&ett_amr_toc,
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};
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/* Register the protocol name and description */
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proto_amr = proto_register_protocol("Adaptive Multi-Rate","AMR", "amr");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_amr, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register a configuration option for port */
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amr_module = prefs_register_protocol(proto_amr, proto_reg_handoff_amr);
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prefs_register_uint_preference(amr_module, "dynamic.payload.type",
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"AMR dynamic payload type",
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"The dynamic payload type which will be interpretyed as AMR",
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10,
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&temp_dynamic_payload_type);
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}
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