/* packet-mpeg-pat.c * Routines for MPEG2 (ISO/ISO 13818-1) Program Associate Table (PAT) dissection * Copyright 2012, Guy Martin * * Wireshark - Network traffic analyzer * By Gerald Combs * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include "packet-mpeg-sect.h" void proto_register_mpeg_pat(void); void proto_reg_handoff_mpeg_pat(void); static int proto_mpeg_pat = -1; static int hf_mpeg_pat_transport_stream_id = -1; static int hf_mpeg_pat_reserved = -1; static int hf_mpeg_pat_version_number = -1; static int hf_mpeg_pat_current_next_indicator = -1; static int hf_mpeg_pat_section_number = -1; static int hf_mpeg_pat_last_section_number = -1; static int hf_mpeg_pat_program_number = -1; static int hf_mpeg_pat_program_reserved = -1; static int hf_mpeg_pat_program_map_pid = -1; static gint ett_mpeg_pat = -1; static gint ett_mpeg_pat_prog = -1; #define MPEG_PAT_RESERVED_MASK 0xC0 #define MPEG_PAT_VERSION_NUMBER_MASK 0x3E #define MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK 0x01 #define MPEG_PAT_PROGRAM_RESERVED_MASK 0xE000 #define MPEG_PAT_PROGRAM_MAP_PID_MASK 0x1FFF static const true_false_string mpeg_pat_cur_next_vals = { "Currently applicable", "Not yet applicable" }; static int dissect_mpeg_pat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { guint offset = 0, length = 0; guint16 prog_num, prog_pid; proto_item *ti; proto_tree *mpeg_pat_tree; proto_tree *mpeg_pat_prog_tree; /* The TVB should start right after the section_length in the Section packet */ col_set_str(pinfo->cinfo, COL_INFO, "Program Association Table (PAT)"); ti = proto_tree_add_item(tree, proto_mpeg_pat, tvb, offset, -1, ENC_NA); mpeg_pat_tree = proto_item_add_subtree(ti, ett_mpeg_pat); offset += packet_mpeg_sect_header(tvb, offset, mpeg_pat_tree, &length, NULL); length -= 4; proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_reserved, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_version_number, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN); offset += 1; proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_section_number, tvb, offset, 1, ENC_BIG_ENDIAN); offset += 1; proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN); offset += 1; if (offset >= length) return offset; /* Parse all the programs */ while (offset < length) { prog_num = tvb_get_ntohs(tvb, offset); prog_pid = tvb_get_ntohs(tvb, offset + 2) & MPEG_PAT_PROGRAM_MAP_PID_MASK; mpeg_pat_prog_tree = proto_tree_add_subtree_format(mpeg_pat_tree, tvb, offset, 4, ett_mpeg_pat_prog, NULL, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid); proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_number, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_reserved, tvb, offset, 2, ENC_BIG_ENDIAN); proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_map_pid, tvb, offset, 2, ENC_BIG_ENDIAN); offset += 2; } offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pat_tree, 0, offset); proto_item_set_len(ti, offset); return tvb_captured_length(tvb); } void proto_register_mpeg_pat(void) { static hf_register_info hf[] = { { &hf_mpeg_pat_transport_stream_id, { "Transport Stream ID", "mpeg_pat.tsid", FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_mpeg_pat_reserved, { "Reserved", "mpeg_pat.reserved", FT_UINT8, BASE_HEX, NULL, MPEG_PAT_RESERVED_MASK, NULL, HFILL } }, { &hf_mpeg_pat_version_number, { "Version Number", "mpeg_pat.version", FT_UINT8, BASE_HEX, NULL, MPEG_PAT_VERSION_NUMBER_MASK, NULL, HFILL } }, { &hf_mpeg_pat_current_next_indicator, { "Current/Next Indicator", "mpeg_pat.cur_next_ind", FT_BOOLEAN, 8, TFS(&mpeg_pat_cur_next_vals), MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL } }, { &hf_mpeg_pat_section_number, { "Section Number", "mpeg_pat.sect_num", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_mpeg_pat_last_section_number, { "Last Section Number", "mpeg_pat.last_sect_num", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL } }, { &hf_mpeg_pat_program_number, { "Program Number", "mpeg_pat.prog_num", FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL } }, { &hf_mpeg_pat_program_reserved, { "Reserved", "mpeg_pat.prog_reserved", FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_RESERVED_MASK, NULL, HFILL } }, { &hf_mpeg_pat_program_map_pid, { "Program Map PID", "mpeg_pat.prog_map_pid", FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_MAP_PID_MASK, NULL, HFILL } }, }; static gint *ett[] = { &ett_mpeg_pat, &ett_mpeg_pat_prog }; proto_mpeg_pat = proto_register_protocol("MPEG2 Program Association Table", "MPEG PAT", "mpeg_pat"); proto_register_field_array(proto_mpeg_pat, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_mpeg_pat(void) { dissector_handle_t mpeg_pat_handle; mpeg_pat_handle = create_dissector_handle(dissect_mpeg_pat, proto_mpeg_pat); dissector_add_uint("mpeg_sect.tid", MPEG_PAT_TID, mpeg_pat_handle); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */