Add a g723 dissector to dissect the first byte to find the rate and if speech is pressent or not.

svn path=/trunk/; revision=13652

1 files changed, 160 insertions, 0 deletions

diff --git a/epan/dissectors/packet-g723.c b/epan/dissectors/packet-g723.c
new file mode 100644
index 0000000000..0833ed943e
--- /dev/null
+++ b/epan/dissectors/packet-g723.c
@@ -0,0 +1,160 @@
+/* packet-g723.c
+ * Routines for G.723 dissection
+ * Copyright 2005, Anders Broman <anders.broman[at]ericsson.com>
+ *
+ * $Id$
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * 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:
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <glib.h>
+
+#ifdef NEED_SNPRINTF_H
+# include "snprintf.h"
+#endif
+
+#include <epan/packet.h>
+#include "rtp_pt.h"
+
+
+/* Initialize the protocol and registered fields */
+static int proto_g723			= -1;
+static int hf_g723_rate_flag	= -1;
+static int hf_g723_vad_flag		= -1;
+static int hf_g723_lpc_B5_B0	= -1;
+
+/* Initialize the subtree pointers */
+static int ett_g723 = -1;
+
+static const true_false_string g723_rate_flag_vals = {
+  "Low rate(5.3kb/s)",
+  "High rate(6.3kb/s)"
+};
+static const true_false_string g723_vad_flag_vals = {
+  "Non-speech",
+  "Speech"
+};
+
+
+/* Code to actually dissect the packets */
+static void
+dissect_g723(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	int offset = 0;
+	guint octet;
+
+/* Set up structures needed to add the protocol subtree and manage it */
+	proto_item *ti;
+	proto_tree *g723_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, "G.723.1");
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_g723, tvb, 0, -1, FALSE);
+
+		g723_tree = proto_item_add_subtree(ti, ett_g723);
+
+		octet = tvb_get_guint8(tvb,offset);
+		proto_tree_add_item(g723_tree, hf_g723_rate_flag, tvb, offset, 1, FALSE);
+		proto_tree_add_item(g723_tree, hf_g723_vad_flag, tvb, offset, 1, FALSE);
+		proto_tree_add_item(g723_tree, hf_g723_lpc_B5_B0, tvb, offset, 1, FALSE);
+	
+		if ((offset & 0x1) == 1 ) /* Low rate */
+			return; 
+
+
+
+
+
+	}/* if tree */
+
+}
+
+
+/* Register the protocol with Ethereal */
+/* 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_g723(void)
+{
+	dissector_handle_t g723_handle;
+	
+	g723_handle = create_dissector_handle(dissect_g723, proto_g723);
+
+	dissector_add("rtp.pt", PT_G723, g723_handle);
+
+}
+
+/* this format is require because a script is used to build the C function
+   that calls all the protocol registration.
+*/
+
+void
+proto_register_g723(void)
+{                 
+
+
+/* Setup list of header fields  See Section 1.6.1 for details*/
+	static hf_register_info hf[] = {
+		{ &hf_g723_rate_flag,
+			{ "RATEFLAG_B0",           "g723.rate.flag",
+			FT_BOOLEAN, 8, TFS(&g723_rate_flag_vals), 0x01,          
+			"RATEFLAG_B0", HFILL }
+		},
+		{ &hf_g723_vad_flag,
+			{ "VADFLAG_B0",           "g723.vad.flag",
+			FT_BOOLEAN, 8, TFS(&g723_vad_flag_vals), 0x02,          
+			"VADFLAG_B0", HFILL }
+		},
+		{ &hf_g723_lpc_B5_B0,
+			{ "LPC_B5...LPC_B0",           "g723.lpc.b5b0",
+			FT_UINT8, BASE_HEX, NULL, 0xfc,          
+			"LPC_B5...LPC_B0", HFILL }
+		},
+
+	};
+
+/* Setup protocol subtree array */
+	static gint *ett[] = {
+		&ett_g723,
+	};
+
+/* Register the protocol name and description */
+	proto_g723 = proto_register_protocol("G723","g723", "g723");
+
+/* Required function calls to register the header fields and subtrees used */
+	proto_register_field_array(proto_g723, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+}
+
+