epan/dissectors/packet-mpeg-pat.c

   1 /* packet-mpeg-pat.c
   2  * Routines for MPEG2 (ISO/ISO 13818-1) Program Associate Table (PAT) dissection
   3  * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29
  30 #include <epan/packet.h>
  31 #include <epan/prefs.h>
  32 #include <epan/dissectors/packet-mpeg-sect.h>
  33
  34 static int proto_mpeg_pat = -1;
  35 static int hf_mpeg_pat_transport_stream_id = -1;
  36 static int hf_mpeg_pat_reserved = -1;
  37 static int hf_mpeg_pat_version_number = -1;
  38 static int hf_mpeg_pat_current_next_indicator = -1;
  39 static int hf_mpeg_pat_section_number = -1;
  40 static int hf_mpeg_pat_last_section_number = -1;
  41
  42 static int hf_mpeg_pat_program_number = -1;
  43 static int hf_mpeg_pat_program_reserved = -1;
  44 static int hf_mpeg_pat_program_map_pid = -1;
  45
  46
  47 static gint ett_mpeg_pat = -1;
  48 static gint ett_mpeg_pat_prog = -1;
  49
  50 #define MPEG_PAT_TID    0x00
  51
  52 #define MPEG_PAT_RESERVED_MASK                    0xC0
  53 #define MPEG_PAT_VERSION_NUMBER_MASK              0x3E
  54 #define MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK      0x01
  55
  56 #define MPEG_PAT_PROGRAM_RESERVED_MASK          0xE000
  57 #define MPEG_PAT_PROGRAM_MAP_PID_MASK           0x1FFF
  58
  59 static const true_false_string mpeg_pat_cur_next_vals = {
  60
  61     "Currently applicable", "Not yet applicable"
  62
  63 };
  64
  65 static void
  66 dissect_mpeg_pat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  67 {
  68
  69     guint offset = 0, length = 0;
  70     guint16 prog_num, prog_pid;
  71
  72     proto_item *ti;
  73     proto_tree *mpeg_pat_tree;
  74     proto_item *pi;
  75     proto_tree *mpeg_pat_prog_tree;
  76
  77     /* The TVB should start right after the section_length in the Section packet */
  78
  79     col_set_str(pinfo->cinfo, COL_INFO, "Program Association Table (PAT)");
  80
  81     ti = proto_tree_add_item(tree, proto_mpeg_pat, tvb, offset, -1, ENC_NA);
  82     mpeg_pat_tree = proto_item_add_subtree(ti, ett_mpeg_pat);
  83
  84     offset += packet_mpeg_sect_header(tvb, offset, mpeg_pat_tree, &length, NULL);
  85     length -= 4;
  86
  87     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
  88     offset += 2;
  89
  90     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
  91     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  92     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
  93     offset += 1;
  94
  95     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  96     offset += 1;
  97
  98     proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
  99     offset += 1;
 100
 101     if (offset >= length)
 102         return;
 103
 104
 105     /* Parse all the programs */
 106     while (offset < length) {
 107
 108         prog_num = tvb_get_ntohs(tvb, offset);
 109         prog_pid = tvb_get_ntohs(tvb, offset + 2) & MPEG_PAT_PROGRAM_MAP_PID_MASK;
 110
 111         pi = proto_tree_add_text(mpeg_pat_tree, tvb, offset, 4, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid);
 112         mpeg_pat_prog_tree = proto_item_add_subtree(pi, ett_mpeg_pat_prog);
 113
 114         proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_number, tvb, offset, 2, ENC_BIG_ENDIAN);
 115         offset += 2;
 116
 117         proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
 118         proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_map_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
 119         offset += 2;
 120
 121     }
 122
 123     offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pat_tree, 0, offset);
 124     proto_item_set_len(ti, offset);
 125 }
 126
 127
 128 void
 129 proto_register_mpeg_pat(void)
 130 {
 131
 132     static hf_register_info hf[] = {
 133
 134         { &hf_mpeg_pat_transport_stream_id, {
 135             "Transport Stream ID", "mpeg_pat.tsid",
 136             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 137         } },
 138
 139         { &hf_mpeg_pat_reserved, {
 140             "Reserved", "mpeg_pat.reserved",
 141             FT_UINT8, BASE_HEX, NULL, MPEG_PAT_RESERVED_MASK, NULL, HFILL
 142         } },
 143
 144         { &hf_mpeg_pat_version_number, {
 145             "Version Number", "mpeg_pat.version",
 146             FT_UINT8, BASE_HEX, NULL, MPEG_PAT_VERSION_NUMBER_MASK, NULL, HFILL
 147         } },
 148
 149         { &hf_mpeg_pat_current_next_indicator, {
 150             "Current/Next Indicator", "mpeg_pat.cur_next_ind",
 151             FT_BOOLEAN, 8, TFS(&mpeg_pat_cur_next_vals), MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
 152         } },
 153
 154         { &hf_mpeg_pat_section_number, {
 155             "Section Number", "mpeg_pat.sect_num",
 156             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 157         } },
 158
 159         { &hf_mpeg_pat_last_section_number, {
 160             "Last Section Number", "mpeg_pat.last_sect_num",
 161             FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
 162         } },
 163
 164         { &hf_mpeg_pat_program_number, {
 165             "Program Number", "mpeg_pat.prog_num",
 166             FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
 167         } },
 168
 169         { &hf_mpeg_pat_program_reserved, {
 170             "Reserved", "mpeg_pat.prog_reserved",
 171             FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_RESERVED_MASK, NULL, HFILL
 172         } },
 173
 174         { &hf_mpeg_pat_program_map_pid, {
 175             "Program Map PID", "mpeg_pat.prog_map_pid",
 176             FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_MAP_PID_MASK, NULL, HFILL
 177         } },
 178
 179     };
 180
 181     static gint *ett[] = {
 182         &ett_mpeg_pat,
 183         &ett_mpeg_pat_prog
 184     };
 185
 186     proto_mpeg_pat = proto_register_protocol("MPEG2 Program Association Table", "MPEG PAT", "mpeg_pat");
 187
 188     proto_register_field_array(proto_mpeg_pat, hf, array_length(hf));
 189     proto_register_subtree_array(ett, array_length(ett));
 190
 191 }
 192
 193
 194 void proto_reg_handoff_mpeg_pat(void)
 195 {
 196     dissector_handle_t mpeg_pat_handle;
 197
 198     mpeg_pat_handle = create_dissector_handle(dissect_mpeg_pat, proto_mpeg_pat);
 199     dissector_add_uint("mpeg_sect.tid", MPEG_PAT_TID, mpeg_pat_handle);
 200 }
 201
 202 /*
 203  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 204  *
 205  * Local variables:
 206  * c-basic-offset: 4
 207  * tab-width: 8
 208  * indent-tabs-mode: nil
 209  * End:
 210  *
 211  * vi: set shiftwidth=4 tabstop=8 expandtab:
 212  * :indentSize=4:tabSize=8:noTabs=true:
 213  */