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