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wireshark/epan/dissectors/packet-mpeg-pmt.c
Michael Mann f4b0abc729 Dissectors don't need a journey of self discovery. 
They already know who they are when they register themselves.  Saving the
handle then to avoid finding it later.
Not sure if this will increase unnecessary register_dissector functions
(instead of using create_dissector_handle in proto_reg_handoff function)
when other dissectors copy/paste, but it should make startup time
a few microseconds better.

Change-Id: I3839be791b32b84887ac51a6a65fb5733e9f1f43
Reviewed-on: https://code.wireshark.org/review/19481
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
2016-12-31 07:31:42 +00:00

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/* packet-mpeg-pmt.c
* Routines for MPEG2 (ISO/ISO 13818-1) Program Map Table (PMT) dissection
* Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-mpeg-sect.h"
#include "packet-mpeg-descriptor.h"
void proto_register_mpeg_pmt(void);
void proto_reg_handoff_mpeg_pmt(void);
static int proto_mpeg_pmt = -1;
static int hf_mpeg_pmt_program_number = -1;
static int hf_mpeg_pmt_reserved1 = -1;
static int hf_mpeg_pmt_version_number = -1;
static int hf_mpeg_pmt_current_next_indicator = -1;
static int hf_mpeg_pmt_section_number = -1;
static int hf_mpeg_pmt_last_section_number = -1;
static int hf_mpeg_pmt_reserved2 = -1;
static int hf_mpeg_pmt_pcr_pid = -1;
static int hf_mpeg_pmt_reserved3 = -1;
static int hf_mpeg_pmt_program_info_length = -1;
static int hf_mpeg_pmt_stream_type = -1;
static int hf_mpeg_pmt_stream_reserved1 = -1;
static int hf_mpeg_pmt_stream_elementary_pid = -1;
static int hf_mpeg_pmt_stream_reserved2 = -1;
static int hf_mpeg_pmt_stream_es_info_length = -1;
static gint ett_mpeg_pmt = -1;
static gint ett_mpeg_pmt_stream = -1;
static dissector_handle_t mpeg_pmt_handle;
#define MPEG_PMT_RESERVED1_MASK 0xC0
#define MPEG_PMT_VERSION_NUMBER_MASK 0x3E
#define MPEG_PMT_CURRENT_NEXT_INDICATOR_MASK 0x01
#define MPEG_PMT_RESERVED2_MASK 0xE000
#define MPEG_PMT_PCR_PID_MASK 0x1FFF
#define MPEG_PMT_RESERVED3_MASK 0xF000
#define MPEG_PMT_PROGRAM_INFO_LENGTH_MASK 0x0FFF
#define MPEG_PMT_STREAM_RESERVED1_MASK 0xE000
#define MPEG_PMT_STREAM_ELEMENTARY_PID_MASK 0x1FFF
#define MPEG_PMT_STREAM_RESERVED2_MASK 0xF000
#define MPEG_PMT_STREAM_ES_INFO_LENGTH_MASK 0x0FFF
static const value_string mpeg_pmt_cur_next_vals[] = {
{ 0x0, "Not yet applicable" },
{ 0x1, "Currently applicable" },
{ 0x0, NULL }
};
static const value_string mpeg_pmt_stream_type_vals[] = {
{ 0x00, "ITU-T | ISO/IEC Reserved" },
{ 0x01, "ISO/IEC 11172 Video" },
{ 0x02, "ITU-T Rec. H.262 | ISO/IEC 13818-2 Video or ISO/IEC 11172-2 constrained parameter video stream" },
{ 0x03, "ISO/IEC 11172 Audio" },
{ 0x04, "ISO/IEC 13818-3 Audio" },
{ 0x05, "ITU-T Rec. H.222.0 | ISO/IEC 13818-1 private_sections" },
{ 0x06, "ITU-T Rec. H.222.0 | ISO/IEC 13818-1 PES packets containing private data" },
{ 0x07, "ISO/IEC 13522 MHEG" },
{ 0x08, "ITU-T Rec. H.222.0 | ISO/IEC 13818-1 Annex A DSM-CC" },
{ 0x09, "ITU-T Rec. H.222.1" },
{ 0x0A, "ISO/IEC 13818-6 type A" },
{ 0x0B, "ISO/IEC 13818-6 type B" },
{ 0x0C, "ISO/IEC 13818-6 type C" },
{ 0x0D, "ISO/IEC 13818-6 type D" },
{ 0x0E, "ITU-T Rec. H.222.0 | ISO/IEC 13818-1 auxiliary" },
{ 0x0F, "ISO/IEC 13818-7 Audio with ADTS transport syntax" },
{ 0x10, "ISO/IEC 14496-2 Visual" },
{ 0x11, "ISO/IEC 14496-3 Audio with the LATM transport syntax as defined in ISO/IEC 14496-3 / AMD 1" },
{ 0x12, "ISO/IEC 14496-1 SL-packetized stream or FlexMux stream carried in PES packets" },
{ 0x13, "ISO/IEC 14496-1 SL-packetized stream or FlexMux stream carried in ISO/IEC14496_sections" },
{ 0x14, "ISO/IEC 13818-6 Synchronized Download Protocol" },
{ 0x15, "Metadata carried in PES packets" },
{ 0x16, "Metadata carried in metadata sections" },
{ 0x17, "Metadata carried in ISO/IEC 13818-6 Data Carousel" },
{ 0x18, "Metadata carried in ISO/IEC 13818-6 Object Carousel" },
{ 0x19, "Metadata carried in ISO/IEC 13818-6 Synchronized Download Protocol" },
{ 0x1A, "IPMP stream (defined in ISO/IEC 13818-11, MPEG-2 IPMP)" },
{ 0x1B, "AVC video stream as defined in ITU-T Rec. H.264 | ISO/IEC 14496-10 Video" },
{ 0x24, "ITU-T Rec. H.265 and ISO/IEC 23008-2 (Ultra HD video) in a packetized stream" },
{ 0x7F, "IPMP stream" },
{ 0x81, "ATSC A/52 Audio" },
{ 0x86, "SCTE-35 Splice Information" },
{ 0xA1, "ETV-AM BIF Data Stream" },
{ 0xC0, "ETV-AM EISS Signaling" },
{ 0x00, NULL }
};
value_string_ext mpeg_pmt_stream_type_vals_ext = VALUE_STRING_EXT_INIT(mpeg_pmt_stream_type_vals);
static int
dissect_mpeg_pmt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
guint offset = 0, length = 0;
guint prog_info_len, es_info_len;
guint16 pid;
proto_item *ti;
proto_tree *mpeg_pmt_tree;
proto_tree *mpeg_pmt_stream_tree;
/* The TVB should start right after the section_length in the Section packet */
col_set_str(pinfo->cinfo, COL_INFO, "Program Map Table (PMT)");
ti = proto_tree_add_item(tree, proto_mpeg_pmt, tvb, offset, -1, ENC_NA);
mpeg_pmt_tree = proto_item_add_subtree(ti, ett_mpeg_pmt);
offset += packet_mpeg_sect_header(tvb, offset, mpeg_pmt_tree, &length, NULL);
length -= 4;
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_program_number, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_reserved1, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_reserved2, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_pcr_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
prog_info_len = tvb_get_ntohs(tvb, offset) & MPEG_PMT_PROGRAM_INFO_LENGTH_MASK;
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_reserved3, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pmt_tree, hf_mpeg_pmt_program_info_length, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, prog_info_len, mpeg_pmt_tree);
while (offset < length) {
pid = tvb_get_ntohs(tvb, offset + 1) & MPEG_PMT_STREAM_ELEMENTARY_PID_MASK;
es_info_len = tvb_get_ntohs(tvb, offset + 3) & MPEG_PMT_STREAM_ES_INFO_LENGTH_MASK;
mpeg_pmt_stream_tree = proto_tree_add_subtree_format(mpeg_pmt_tree, tvb, offset, 5 + es_info_len,
ett_mpeg_pmt_stream, NULL, "Stream PID=0x%04hx", pid);
proto_tree_add_item(mpeg_pmt_stream_tree, hf_mpeg_pmt_stream_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mpeg_pmt_stream_tree, hf_mpeg_pmt_stream_reserved1, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pmt_stream_tree, hf_mpeg_pmt_stream_elementary_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(mpeg_pmt_stream_tree, hf_mpeg_pmt_stream_reserved2, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pmt_stream_tree, hf_mpeg_pmt_stream_es_info_length, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, es_info_len, mpeg_pmt_stream_tree);
}
offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pmt_tree, 0, offset);
proto_item_set_len(ti, offset);
return offset;
}
void
proto_register_mpeg_pmt(void)
{
static hf_register_info hf[] = {
{ &hf_mpeg_pmt_program_number, {
"Program Number", "mpeg_pmt.pg_num",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_mpeg_pmt_reserved1, {
"Reserved", "mpeg_pmt.reserved1",
FT_UINT8, BASE_HEX, NULL, MPEG_PMT_RESERVED1_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_version_number, {
"Version Number", "mpeg_pmt.version",
FT_UINT8, BASE_HEX, NULL, MPEG_PMT_VERSION_NUMBER_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_current_next_indicator, {
"Current/Next Indicator", "mpeg_pmt.cur_next_ind",
FT_UINT8, BASE_HEX, VALS(mpeg_pmt_cur_next_vals), MPEG_PMT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_section_number, {
"Section Number", "mpeg_pmt.sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_mpeg_pmt_last_section_number, {
"Last Section Number", "mpeg_pmt.last_sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_mpeg_pmt_reserved2, {
"Reserved", "mpeg_pmt.reserved2",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_RESERVED2_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_pcr_pid, {
"PCR PID", "mpeg_pmt.pcr_pid",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_PCR_PID_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_reserved3, {
"Reserved", "mpeg_pmt.reserved3",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_RESERVED3_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_program_info_length, {
"Program Info Length", "mpeg_pmt.prog_info_len",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_PROGRAM_INFO_LENGTH_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_stream_type, {
"Stream type", "mpeg_pmt.stream.type",
FT_UINT8, BASE_HEX | BASE_EXT_STRING, &mpeg_pmt_stream_type_vals_ext, 0, NULL, HFILL
} },
{ &hf_mpeg_pmt_stream_reserved1, {
"Reserved", "mpeg_pmt.stream.reserved1",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_STREAM_RESERVED1_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_stream_elementary_pid, {
"Elementary PID", "mpeg_pmt.stream.elementary_pid",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_STREAM_ELEMENTARY_PID_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_stream_reserved2, {
"Reserved", "mpeg_pmt.stream.reserved2",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_STREAM_RESERVED2_MASK, NULL, HFILL
} },
{ &hf_mpeg_pmt_stream_es_info_length, {
"ES Info Length", "mpeg_pmt.stream.es_info_len",
FT_UINT16, BASE_HEX, NULL, MPEG_PMT_STREAM_ES_INFO_LENGTH_MASK, NULL, HFILL
} },
};
static gint *ett[] = {
&ett_mpeg_pmt,
&ett_mpeg_pmt_stream,
};
proto_mpeg_pmt = proto_register_protocol("MPEG2 Program Map Table", "MPEG PMT", "mpeg_pmt");
proto_register_field_array(proto_mpeg_pmt, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
mpeg_pmt_handle = register_dissector("mpeg_pmt", dissect_mpeg_pmt, proto_mpeg_pmt);
}
void
proto_reg_handoff_mpeg_pmt(void)
{
dissector_add_uint("mpeg_sect.tid", MPEG_PMT_TID, mpeg_pmt_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:
*/
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