130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
/* packet-g723.c
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* Routines for G.723 dissection
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* Copyright 2005, Anders Broman <anders.broman[at]ericsson.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*
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* References:
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/rtp_pt.h>
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void proto_reg_handoff_g723(void);
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void proto_register_g723(void);
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/* Initialize the protocol and registered fields */
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static int proto_g723 = -1;
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static int hf_g723_frame_size_and_codec = -1;
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static int hf_g723_lpc_B5_B0 = -1;
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/* Initialize the subtree pointers */
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static int ett_g723 = -1;
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/* RFC 3551
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The least significant two bits of the first
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octet in the frame determine the frame size and codec type:
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bits content octets/frame
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00 high-rate speech (6.3 kb/s) 24
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01 low-rate speech (5.3 kb/s) 20
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10 SID frame 4
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11 reserved
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*/
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static const value_string g723_frame_size_and_codec_type_value[] = {
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{0, "High-rate speech (6.3 kb/s)"},
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{1, "Low-rate speech (5.3 kb/s)"}, /* Not coded */
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{2, "SID frame"},
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{3, "Reserved"},
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{ 0, NULL }
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};
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/* Dissection */
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static int
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dissect_g723(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int offset = 0;
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guint octet;
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proto_item *ti;
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proto_tree *g723_tree;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "G.723.1");
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if (tree) {
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ti = proto_tree_add_item(tree, proto_g723, tvb, 0, -1, ENC_NA);
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g723_tree = proto_item_add_subtree(ti, ett_g723);
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octet = tvb_get_guint8(tvb,offset);
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proto_tree_add_item(g723_tree, hf_g723_frame_size_and_codec, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(g723_tree, hf_g723_lpc_B5_B0, tvb, offset, 1, ENC_BIG_ENDIAN);
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if ((octet & 0x1) == 1 ) /* Low rate */
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return tvb_captured_length(tvb);
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}/* if tree */
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return tvb_captured_length(tvb);
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}
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void
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proto_reg_handoff_g723(void)
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{
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dissector_handle_t g723_handle;
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g723_handle = create_dissector_handle(dissect_g723, proto_g723);
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dissector_add_uint("rtp.pt", PT_G723, g723_handle);
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}
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void
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proto_register_g723(void)
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{
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static hf_register_info hf[] = {
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{ &hf_g723_frame_size_and_codec,
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{ "Frame size and codec type", "g723.frame_size_and_codec",
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FT_UINT8, BASE_HEX, VALS(g723_frame_size_and_codec_type_value), 0x03,
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"RATEFLAG_B0", HFILL }
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},
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{ &hf_g723_lpc_B5_B0,
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{ "LPC_B5...LPC_B0", "g723.lpc.b5b0",
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FT_UINT8, BASE_HEX, NULL, 0xfc,
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NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_g723,
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};
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proto_g723 = proto_register_protocol("G.723","G.723", "g723");
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proto_register_field_array(proto_g723, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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