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wireshark/packet-mpeg1.c

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/* packet-mpeg1.c
*
* Routines for RFC 2250 MPEG-1 dissection
*
* $Id: packet-mpeg1.c,v 1.10 2003/08/23 06:36:46 guy Exp $
*
* Copyright 2001,
* Francisco Javier Cabello Torres, <fjcabello@vtools.es>
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* 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.
*/
/*
* This dissector tries to dissect the MPEG-1 video streams.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <epan/packet.h>
#include <stdio.h>
#include <string.h>
#include "rtp_pt.h"
#define RTP_MPG_MBZ(word) ( word >> 11)
#define RTP_MPG_T(word) ( (word >> 10) & 1 )
#define RTP_MPG_TR(word) ( word & 0x3ff )
#define RTP_MPG_AN(octet) ( octet >> 7)
#define RTP_MPG_N(octet) ( (octet >> 6) & 1 )
#define RTP_MPG_S(octet) ( (octet >> 5) & 1 )
#define RTP_MPG_B(octet) ( (octet >> 4) & 1 )
#define RTP_MPG_E(octet) ( (octet >> 3) & 1 )
#define RTP_MPG_P(octet) ( octet & 7 )
#define RTP_MPG_FBV(octet) ( (octet >> 7) & 1 )
#define RTP_MPG_BFC(octet) ( (octet >> 4) & 7 )
#define RTP_MPG_FFV(octet) ( (octet >> 3) & 1 )
#define RTP_MPG_FFC(octet) ( octet & 7 )
/* MPEG1 header fields */
static int proto_mpg = -1;
static int hf_rtp_mpg_mbz = -1;
static int hf_rtp_mpg_T = -1;
static int hf_rtp_mpg_tr = -1;
static int hf_rtp_mpg_an = -1;
static int hf_rtp_mpg_n = -1;
static int hf_rtp_mpg_s = -1;
static int hf_rtp_mpg_b = -1;
static int hf_rtp_mpg_e = -1;
static int hf_rtp_mpg_p = -1;
static int hf_rtp_mpg_fbv = -1;
static int hf_rtp_mpg_bfc = -1;
static int hf_rtp_mpg_ffv = -1;
static int hf_rtp_mpg_ffc = -1;
static int hf_rtp_mpg_data = -1;
/* MPEG-1 fields defining a sub tree */
static gint ett_mpg = -1;
static const value_string rtp_mpg_picture_types_vals[] =
{
{ 0, "Forbidden" },
{ 1, "I-Picture" },
{ 2, "P-Picture" },
{ 3, "B-Picture" },
{ 4, "D-Picture" },
{ 5, "reserved" },
{ 6, "reserved" },
{ 7, "reserved" },
{ 0, NULL },
};
static void
dissect_mpeg1( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
{
proto_item *ti = NULL;
proto_tree *mpg_tree = NULL;
unsigned int offset = 0;
guint8 octet;
guint16 word;
guint16 mpg_mbz;
guint16 mpg_T;
guint16 mpg_tr;
guint16 mpg_an;
guint16 mpg_n;
gboolean mpg_s;
gboolean mpg_b;
gboolean mpg_e;
guint16 mpg_p;
guint16 mpg_fbv;
guint16 mpg_bfc;
guint16 mpg_ffv;
guint16 mpg_ffc;
if ( check_col( pinfo->cinfo, COL_PROTOCOL ) )
{
col_set_str( pinfo->cinfo, COL_PROTOCOL, "MPEG-1" );
}
if ( check_col( pinfo->cinfo, COL_INFO) )
{
col_set_str( pinfo->cinfo, COL_INFO, "MPEG-1 message");
}
/* Get MPEG-1 fields */
word = tvb_get_guint8( tvb, offset );
word = (word << 8) | tvb_get_guint8( tvb, offset +1 );
mpg_mbz = RTP_MPG_MBZ(word);
mpg_T = RTP_MPG_T(word);
mpg_tr = RTP_MPG_TR(word);
octet = tvb_get_guint8( tvb, offset + 2 );
mpg_an = RTP_MPG_AN(octet);
mpg_n = RTP_MPG_N(octet);
mpg_s = RTP_MPG_S(octet);
mpg_b = RTP_MPG_B(octet);
mpg_e = RTP_MPG_E(octet);
mpg_p = RTP_MPG_P(octet);
octet = tvb_get_guint8( tvb, offset + 3 );
mpg_fbv = RTP_MPG_FBV(octet);
mpg_bfc = RTP_MPG_BFC(octet);
mpg_ffv = RTP_MPG_FFV(octet);
mpg_ffc = RTP_MPG_FFC(octet);
if ( tree )
{
ti = proto_tree_add_item( tree, proto_mpg, tvb, offset, -1, FALSE );
mpg_tree = proto_item_add_subtree( ti, ett_mpg );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_mbz, tvb, offset, 1, mpg_mbz );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_T , tvb, offset, 1, mpg_T );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_tr , tvb, offset, 2, mpg_tr );
offset += 2;
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_an, tvb, offset, 1, mpg_an );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_n , tvb, offset, 1, mpg_n );
proto_tree_add_boolean( mpg_tree, hf_rtp_mpg_s , tvb, offset, 1, mpg_s );
proto_tree_add_boolean( mpg_tree, hf_rtp_mpg_b , tvb, offset, 1, mpg_b );
proto_tree_add_boolean( mpg_tree, hf_rtp_mpg_e , tvb, offset, 1, mpg_e );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_p, tvb , offset, 1, mpg_p );
offset += 1;
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_fbv, tvb, offset, 1, mpg_fbv );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_bfc, tvb, offset, 1, mpg_bfc );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_ffv, tvb, offset, 1, mpg_ffv );
proto_tree_add_uint( mpg_tree, hf_rtp_mpg_ffc, tvb, offset, 1, mpg_ffc );
offset += 1;
/* The rest of the packet is the MPEG-1 stream */
proto_tree_add_item( mpg_tree, hf_rtp_mpg_data, tvb, offset, -1, FALSE );
}
}
void
proto_register_mpeg1(void)
{
static hf_register_info hf[] =
{
{
&hf_rtp_mpg_mbz,
{
"MBZ",
"rtp.payload_mpeg_mbz",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_T,
{
"T",
"rtp.payload_mpeg_T",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_tr,
{
"Temporal Reference",
"rtp.payload_mpeg_tr",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_an,
{
"AN",
"rtp.payload_mpeg_an",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_n,
{
"New Picture Header",
"rtp.payload_mpeg_n",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_s,
{
"Sequence Header",
"rtp.payload_mpeg_s",
FT_BOOLEAN,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_b,
{
"Beginning-of-slice",
"rtp.payload_mpeg_b",
FT_BOOLEAN,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_e,
{
"End-of-slice",
"rtp.payload_mpeg_an",
FT_BOOLEAN,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_p,
{
"Picture type",
"rtp.payload_mpeg_p",
FT_UINT16,
BASE_DEC,
VALS(rtp_mpg_picture_types_vals),
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_fbv,
{
"FBV",
"rtp.payload_mpeg_fbv",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_bfc,
{
"BFC",
"rtp.payload_mpeg_bfc",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_ffv,
{
"FFV",
"rtp.payload_mpeg_ffv",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_ffc,
{
"FFC",
"rtp.payload_mpeg_ffc",
FT_UINT16,
BASE_DEC,
NULL,
0x0,
"", HFILL
}
},
{
&hf_rtp_mpg_data,
{
"MPEG-1 stream",
"mpeg1.stream",
FT_BYTES,
BASE_NONE,
NULL,
0x0,
"", HFILL
}
},
};
static gint *ett[] =
{
&ett_mpg,
};
proto_mpg = proto_register_protocol("RFC 2250 MPEG1","MPEG1","mpeg1");
proto_register_field_array(proto_mpg, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_mpeg1(void)
{
dissector_handle_t mpeg1_handle;
mpeg1_handle = create_dissector_handle(dissect_mpeg1, proto_mpg);
dissector_add("rtp.pt", PT_MPV, mpeg1_handle);
}
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