--- /dev/null
+/* packet-2dparityfec.c
+ * Mark Lewis <mlewis@altera.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.
+ */
+
+/*
+** RTP Payload dissector for packets as specified in:
+** Pro-MPEG Code of Practice #3 release 2
+**
+** This protocol defines a format for FEC data embedded within RTP packets with
+** a payload type of 96 (0x60). The format of the FEC packets, which reside within
+** the RTP payload, is as follows...
+**
+** +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+** | SNBase low bits | Length Recovery |
+** +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+** |E| PT recovery | Mask |
+** +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+** | TS recovery |
+** +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+** |X|D|type |index| Offset | NA |SNBase ext bits|
+** +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+** | |
+** : FEC Payload :
+** | |
+** +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+**
+** For more information on this protocol see...
+** http://www.pro-mpeg.org/publications/pdf/Vid-on-IP-CoP3-r2.pdf
+**
+**
+** Notes:
+**
+** This protocol always resides in RTP packets with payload type 96. However,
+** type 96 is dynamic and may refer to other protocols. As Pro-MPEG FEC must
+** function in the absence of a control channel, and because this data is
+** likely to be transmitted within closed networks, no automatic mechanism
+** exists for specifying the existance of Pro-MPEG FEC on payload type 96.
+** This dissector is thus disabled by default. Dissection of this protocol
+** may be enabled from the 2dparityfec panel under Preferences->Protocols.
+**
+** Mark Lewis - 20th June 2006
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <epan/packet.h>
+#include <epan/prefs.h>
+
+/* forward reference */
+void proto_register_2dparityfec(void);
+void proto_reg_handoff_2dparityfec(void);
+
+static gboolean dissect_fec = FALSE;
+
+static int proto_2dparityfec = -1;
+static int fec_rtp_payload_type = 96;
+static gint ett_2dparityfec = -1;
+
+static int hf_2dparityfec_snbase_low = -1;
+static int hf_2dparityfec_length_recovery = -1;
+static int hf_2dparityfec_rfc2733_ext = -1;
+static int hf_2dparityfec_pt_recovery = -1;
+static int hf_2dparityfec_mask = -1;
+static int hf_2dparityfec_ts_recovery = -1;
+static int hf_2dparityfec_ts_pro_mpeg_ext = -1;
+static int hf_2dparityfec_row_flag = -1;
+static int hf_2dparityfec_type = -1;
+static int hf_2dparityfec_index = -1;
+static int hf_2dparityfec_offset = -1;
+static int hf_2dparityfec_na = -1;
+static int hf_2dparityfec_snbase_ext = -1;
+static int hf_2dparityfec_payload = -1;
+
+static const value_string fec_type_names[] = {
+ {0, "XOR"},
+ {1, "Hamming"},
+ {2, "Reed-Solomon"}};
+
+static void dissect_2dparityfec(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ guint8 OffsetField;
+ guint8 NAField;
+ guint32 SNBase;
+ guint8 D;
+
+ /* Extract SNBase */
+ SNBase = (guint32)tvb_get_guint8(tvb, 0)<<8;
+ SNBase |= (guint32)tvb_get_guint8(tvb, 1);
+ SNBase |= (guint32)tvb_get_guint8(tvb, 15)<<16;
+
+ /* Extract D */
+ D = (tvb_get_guint8(tvb, 12)>>6) & 0x1;
+
+ /* Extract Offset and NA */
+ OffsetField = tvb_get_guint8(tvb, 13);
+ NAField = tvb_get_guint8(tvb, 14);
+
+ if(check_col(pinfo->cinfo, COL_PROTOCOL))
+ {
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "2dFEC");
+ }
+
+ /* Configure the info column */
+ if(check_col(pinfo->cinfo, COL_INFO))
+ {
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ if(D)
+ {
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Row FEC - SNBase=%u, Offset=%u, NA=%u",
+ SNBase, OffsetField, NAField);
+ }
+ else
+ {
+ col_add_fstr(pinfo->cinfo, COL_INFO, "Column FEC - SNBase=%u, Offset=%u, NA=%u",
+ SNBase, OffsetField, NAField);
+ }
+ }
+
+ if(tree)
+ {
+ /* we are being asked for details */
+ proto_item *ti = NULL;
+ proto_tree *tree_2dparityfec = NULL;
+ gint offset = 0;
+
+ ti = proto_tree_add_item(tree, proto_2dparityfec, tvb, 0, -1, FALSE);
+ tree_2dparityfec = proto_item_add_subtree(ti, ett_2dparityfec);
+
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_snbase_low, tvb, offset, 2, FALSE); offset += 2;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_length_recovery, tvb, offset, 2, FALSE); offset += 2;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_rfc2733_ext, tvb, offset, 1, FALSE);
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_pt_recovery, tvb, offset, 1, FALSE); offset += 1;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_mask, tvb, offset, 3, FALSE); offset += 3;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_ts_recovery, tvb, offset, 4, FALSE); offset += 4;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_ts_pro_mpeg_ext, tvb, offset, 1, FALSE);
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_row_flag, tvb, offset, 1, FALSE);
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_type, tvb, offset, 1, FALSE);
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_index, tvb, offset, 1, FALSE); offset += 1;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_offset, tvb, offset, 1, FALSE); offset += 1;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_na, tvb, offset, 1, FALSE); offset += 1;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_snbase_ext, tvb, offset, 1, FALSE); offset += 1;
+ proto_tree_add_item(tree_2dparityfec, hf_2dparityfec_payload, tvb, offset, -1, FALSE);
+ }
+}
+
+/* Payload type definitions */
+static hf_register_info hf[] = {
+ {&hf_2dparityfec_snbase_low,
+ { "SNBase low",
+ "2dparityfec.snbase_low",
+ FT_UINT16,
+ BASE_DEC,
+ NULL,
+ 0x0,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_length_recovery,
+ { "Length recovery",
+ "2dparityfec.lr",
+ FT_UINT16,
+ BASE_HEX,
+ NULL,
+ 0x0,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_rfc2733_ext,
+ { "RFC2733 Extension (E)",
+ "2dparityfec.e",
+ FT_BOOLEAN,
+ 8,
+ NULL,
+ 0x80,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_pt_recovery,
+ { "Payload Type recovery",
+ "2dparityfec.ptr",
+ FT_UINT8,
+ BASE_HEX,
+ NULL,
+ 0x7f,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_mask,
+ { "Mask",
+ "2dparityfec.mask",
+ /*FT_UINT32*/FT_UINT24,
+ BASE_HEX,
+ NULL,
+ /*0x00ffffff*/0x0,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_ts_recovery,
+ { "Timestamp recovery",
+ "2dparityfec.tsr",
+ FT_UINT32,
+ BASE_HEX,
+ NULL,
+ 0x0,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_ts_pro_mpeg_ext,
+ { "Pro-MPEG Extension (X)",
+ "2dparityfec.x",
+ FT_BOOLEAN,
+ 8,
+ NULL,
+ 0x80,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_row_flag,
+ { "Row FEC (D)",
+ "2dparityfec.d",
+ FT_BOOLEAN,
+ 8,
+ NULL,
+ 0x40,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_type,
+ { "Type",
+ "2dparityfec.type",
+ FT_UINT8,
+ BASE_DEC,
+ VALS(fec_type_names),
+ 0x38,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_index,
+ { "Index",
+ "2dparityfec.index",
+ FT_UINT8,
+ BASE_DEC,
+ NULL,
+ 0x07,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_offset,
+ { "Offset",
+ "2dparityfec.offset",
+ FT_UINT8,
+ BASE_DEC,
+ NULL,
+ 0x0,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_na,
+ { "NA",
+ "2dparityfec.na",
+ FT_UINT8,
+ BASE_DEC,
+ NULL,
+ 0x0,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_snbase_ext,
+ { "SNBase ext",
+ "2dparityfec.snbase_ext",
+ FT_UINT8,
+ BASE_DEC,
+ NULL,
+ 0x0,
+ "",
+ HFILL} },
+
+ {&hf_2dparityfec_payload,
+ { "FEC Payload",
+ "2dparityfec.payload",
+ FT_BYTES,
+ BASE_HEX,
+ NULL,
+ 0x0,
+ "",
+ HFILL} }
+
+
+};
+
+/* Setup protocol subtree array */
+static gint *ett[] = {
+ &ett_2dparityfec,
+};
+
+void proto_register_2dparityfec(void)
+{
+ module_t *module_2dparityfec;
+
+ proto_register_field_array(proto_2dparityfec, hf, array_length(hf));
+ proto_register_subtree_array(ett, array_length(ett));
+
+ if(proto_2dparityfec == -1) {
+ proto_2dparityfec = proto_register_protocol(
+ "Pro-MPEG Code of Practice #3 release 2 FEC Protocol", /* name */
+ "2dparityfec", /* short name */
+ "2dparityfec"); /* abbrev */
+ }
+
+ module_2dparityfec = prefs_register_protocol(proto_2dparityfec,
+ proto_reg_handoff_2dparityfec);
+
+ prefs_register_bool_preference(module_2dparityfec, "enable",
+ "Decode Pro-MPEG FEC on RTP dynamic payload type 96",
+ "Enable this option to recognise all traffic on RTP dynamic payload type 96 (0x60) "
+ "as FEC data corresponding to Pro-MPEG Code of Practice #3 release 2",
+ &dissect_fec);
+
+}
+
+void proto_reg_handoff_2dparityfec(void)
+{
+ static dissector_handle_t handle_2dparityfec = NULL;
+
+ if (!handle_2dparityfec) {
+ handle_2dparityfec = create_dissector_handle(dissect_2dparityfec,
+ proto_2dparityfec);
+ }
+
+ if (dissect_fec) {
+ dissector_add("rtp.pt", fec_rtp_payload_type, handle_2dparityfec);
+ } else {
+ dissector_delete("rtp.pt", fec_rtp_payload_type, handle_2dparityfec);
+ }
+}
git.samba.org / obnox / wireshark / wip.git / commitdiff