/* packet-rfc2190.c * * Routines for RFC2190-encapsulated H.263 dissection * * Copyright 2003 Niklas Ogren * Seven Levels Consultants AB * * Copyright 2008 Richard van der Hoff, MX Telecom * * * $Id$ * * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* * This dissector tries to dissect the H.263 protocol according to * RFC 2190, http://www.ietf.org/rfc/rfc2190.txt */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "packet-h263.h" /* H.263 header fields */ static int proto_rfc2190 = -1; /* Mode A header */ static int hf_rfc2190_ftype = -1; static int hf_rfc2190_pbframes = -1; static int hf_rfc2190_sbit = -1; static int hf_rfc2190_ebit = -1; static int hf_rfc2190_srcformat = -1; static int hf_rfc2190_picture_coding_type = -1; static int hf_rfc2190_unrestricted_motion_vector = -1; static int hf_rfc2190_syntax_based_arithmetic = -1; static int hf_rfc2190_advanced_prediction = -1; static int hf_rfc2190_r = -1; static int hf_rfc2190_rr = -1; static int hf_rfc2190_dbq = -1; static int hf_rfc2190_trb = -1; static int hf_rfc2190_tr = -1; /* Additional fields for Mode B or C header */ static int hf_rfc2190_quant = -1; static int hf_rfc2190_gobn = -1; static int hf_rfc2190_mba = -1; static int hf_rfc2190_hmv1 = -1; static int hf_rfc2190_vmv1 = -1; static int hf_rfc2190_hmv2 = -1; static int hf_rfc2190_vmv2 = -1; static gint ett_rfc2190 = -1; static dissector_handle_t h263_handle; static void dissect_rfc2190( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) { proto_item *ti = NULL; proto_tree *rfc2190_tree = NULL; unsigned int offset = 0; unsigned int rfc2190_version = 0; tvbuff_t *next_tvb; rfc2190_version = (tvb_get_guint8( tvb, offset ) & 0xc0 ) >> 6; col_set_str(pinfo->cinfo, COL_PROTOCOL, "H.263 "); if( rfc2190_version == 0x00) { col_append_str( pinfo->cinfo, COL_INFO, "MODE A "); } else if( rfc2190_version == 0x02) { col_append_str( pinfo->cinfo, COL_INFO, "MODE B "); } else if( rfc2190_version == 0x03) { col_append_str( pinfo->cinfo, COL_INFO, "MODE C "); } if ( tree ) { ti = proto_tree_add_item( tree, proto_rfc2190, tvb, offset, -1, FALSE ); rfc2190_tree = proto_item_add_subtree( ti, ett_rfc2190 ); /* FBIT 1st octet, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_ftype, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x80 ); /* PBIT 1st octet, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_pbframes, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x40 ); /* SBIT 1st octet, 3 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_sbit, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x38 ) >> 3 ); /* EBIT 1st octet, 3 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_ebit, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x7 ); offset++; /* SRC 2nd octet, 3 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_srcformat, tvb, offset, 1, tvb_get_guint8( tvb, offset ) >> 5 ); if(rfc2190_version == 0x00) { /* MODE A */ /* I flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_picture_coding_type, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x10 ); /* U flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_unrestricted_motion_vector, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x08 ); /* S flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_syntax_based_arithmetic, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x04 ); /* A flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_advanced_prediction, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x02 ); /* Reserved 2nd octect, 1 bit + 3rd octect 3 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_r, tvb, offset, 2, ( ( tvb_get_guint8( tvb, offset ) & 0x1 ) << 3 ) + ( ( tvb_get_guint8( tvb, offset + 1 ) & 0xe0 ) >> 5 ) ); offset++; /* DBQ 3 octect, 2 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_dbq, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x18 ) >> 3 ); /* TRB 3 octect, 3 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_trb, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x07 ) ); offset++; /* TR 4 octect, 8 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_tr, tvb, offset, 1, tvb_get_guint8( tvb, offset ) ); offset++; } else { /* MODE B or MODE C */ /* QUANT 2 octect, 5 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_quant, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x1f ); offset++; /* GOBN 3 octect, 5 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_gobn, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0xf8 ) >> 3); /* MBA 3 octect, 3 bits + 4 octect 6 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_mba, tvb, offset, 2, ( ( tvb_get_guint8( tvb, offset ) & 0x7 ) << 6 ) + ( ( tvb_get_guint8( tvb, offset + 1 ) & 0xfc ) >> 2 ) ); offset++; /* Reserved 4th octect, 2 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_r, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x3 ) ); offset++; /* I flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_picture_coding_type, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x80 ); /* U flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_unrestricted_motion_vector, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x40 ); /* S flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_syntax_based_arithmetic, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x20 ); /* A flag, 1 bit */ proto_tree_add_boolean( rfc2190_tree, hf_rfc2190_advanced_prediction, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x10 ); /* HMV1 5th octect, 4 bits + 6th octect 3 bits*/ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_hmv1, tvb, offset, 2,( ( tvb_get_guint8( tvb, offset ) & 0xf ) << 3 ) + ( ( tvb_get_guint8( tvb, offset+1 ) & 0xe0 ) >> 5) ); offset++; /* VMV1 6th octect, 5 bits + 7th octect 2 bits*/ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_vmv1, tvb, offset, 2,( ( tvb_get_guint8( tvb, offset ) & 0x1f ) << 2 ) + ( ( tvb_get_guint8( tvb, offset+1 ) & 0xc0 ) >> 6) ); offset++; /* HMV2 7th octect, 6 bits + 8th octect 1 bit*/ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_hmv2, tvb, offset, 2,( ( tvb_get_guint8( tvb, offset ) & 0x3f ) << 1 ) + ( ( tvb_get_guint8( tvb, offset+1 ) & 0xf0 ) >> 7) ); offset++; /* VMV2 8th octect, 7 bits*/ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_vmv2, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x7f ); offset++; if(rfc2190_version == 0x03) { /* MODE C */ /* Reserved 9th to 11th octect, 8 + 8 + 3 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_rr, tvb, offset, 3, ( tvb_get_guint8( tvb, offset ) << 11 ) + ( tvb_get_guint8( tvb, offset + 1 ) << 3 ) + ( ( tvb_get_guint8( tvb, offset + 2 ) & 0xe0 ) >> 5 ) ); offset+=2; /* DBQ 11th octect, 2 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_dbq, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x18 ) >>3 ); /* TRB 11th octect, 3 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_trb, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x07 ); offset++; /* TR 12th octect, 8 bits */ proto_tree_add_uint( rfc2190_tree, hf_rfc2190_tr, tvb, offset, 1, tvb_get_guint8( tvb, offset ) ); offset++; } /* end mode c */ } /* end not mode a */ } else { switch(rfc2190_version) { case 0x00: /* MODE A */ offset += 4; break; case 0x01: /* MODE B */ offset += 8; break; case 0x02: /* MODE C */ offset += 12; break; } } /* The rest of the packet is the H.263 stream */ next_tvb = tvb_new_subset( tvb, offset, tvb_length(tvb) - offset, tvb_reported_length(tvb) - offset); call_dissector(h263_handle,next_tvb,pinfo,tree); } void proto_reg_handoff_rfc2190(void) { dissector_handle_t rfc2190_handle; rfc2190_handle = find_dissector("rfc2190"); dissector_add_uint("rtp.pt", PT_H263, rfc2190_handle); dissector_add_uint("iax2.codec", AST_FORMAT_H263, rfc2190_handle); h263_handle = find_dissector("h263data"); } void proto_register_rfc2190(void) { static hf_register_info hf[] = { { &hf_rfc2190_ftype, { "F", "rfc2190.ftype", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Indicates the mode of the payload header (MODE A or B/C)", HFILL } }, { &hf_rfc2190_pbframes, { "p/b frame", "rfc2190.pbframes", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Optional PB-frames mode as defined by H.263 (MODE C)", HFILL } }, { &hf_rfc2190_sbit, { "Start bit position", "rfc2190.sbit", FT_UINT8, BASE_DEC, NULL, 0x0, "Start bit position specifies number of most significant bits that shall be ignored in the first data byte.", HFILL } }, { &hf_rfc2190_ebit, { "End bit position", "rfc2190.ebit", FT_UINT8, BASE_DEC, NULL, 0x0, "End bit position specifies number of least significant bits that shall be ignored in the last data byte.", HFILL } }, { &hf_rfc2190_srcformat, { "SRC format", "rfc2190.srcformat", FT_UINT8, BASE_DEC, VALS(h263_srcformat_vals), 0x0, "Source format specifies the resolution of the current picture.", HFILL } }, { &hf_rfc2190_picture_coding_type, { "Inter-coded frame", "rfc2190.picture_coding_type", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Picture coding type, intra-coded (false) or inter-coded (true)", HFILL } }, { &hf_rfc2190_unrestricted_motion_vector, { "Motion vector", "rfc2190.unrestricted_motion_vector", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Unrestricted Motion Vector option for current picture", HFILL } }, { &hf_rfc2190_syntax_based_arithmetic, { "Syntax-based arithmetic coding", "rfc2190.syntax_based_arithmetic", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Syntax-based Arithmetic Coding option for current picture", HFILL } }, { &hf_rfc2190_advanced_prediction, { "Advanced prediction option", "rfc2190.advanced_prediction", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Advanced Prediction option for current picture", HFILL } }, { &hf_rfc2190_dbq, { "Differential quantization parameter", "rfc2190.dbq", FT_UINT8, BASE_DEC, NULL, 0x0, "Differential quantization parameter used to calculate quantizer for the B frame based on quantizer for the P frame, when PB-frames option is used.", HFILL } }, { &hf_rfc2190_trb, { "Temporal Reference for B frames", "rfc2190.trb", FT_UINT8, BASE_DEC, NULL, 0x0, "Temporal Reference for the B frame as defined by H.263", HFILL } }, { &hf_rfc2190_tr, { "Temporal Reference for P frames", "rfc2190.tr", FT_UINT8, BASE_DEC, NULL, 0x0, "Temporal Reference for the P frame as defined by H.263", HFILL } }, { &hf_rfc2190_quant, { "Quantizer", "rfc2190.quant", FT_UINT8, BASE_DEC, NULL, 0x0, "Quantization value for the first MB coded at the starting of the packet.", HFILL } }, { &hf_rfc2190_gobn, { "GOB Number", "rfc2190.gobn", FT_UINT8, BASE_DEC, NULL, 0x0, "GOB number in effect at the start of the packet.", HFILL } }, { &hf_rfc2190_mba, { "Macroblock address", "rfc2190.mba", FT_UINT16, BASE_DEC, NULL, 0x0, "The address within the GOB of the first MB in the packet, counting from zero in scan order.", HFILL } }, { &hf_rfc2190_hmv1, { "Horizontal motion vector 1", "rfc2190.hmv1", FT_UINT8, BASE_DEC, NULL, 0x0, "Horizontal motion vector predictor for the first MB in this packet", HFILL } }, { &hf_rfc2190_vmv1, { "Vertical motion vector 1", "rfc2190.vmv1", FT_UINT8, BASE_DEC, NULL, 0x0, "Vertical motion vector predictor for the first MB in this packet", HFILL } }, { &hf_rfc2190_hmv2, { "Horizontal motion vector 2", "rfc2190.hmv2", FT_UINT8, BASE_DEC, NULL, 0x0, "Horizontal motion vector predictor for block number 3 in the first MB in this packet when four motion vectors are used with the advanced prediction option.", HFILL } }, { &hf_rfc2190_vmv2, { "Vertical motion vector 2", "rfc2190.vmv2", FT_UINT8, BASE_DEC, NULL, 0x0, "Vertical motion vector predictor for block number 3 in the first MB in this packet when four motion vectors are used with the advanced prediction option.", HFILL } }, { &hf_rfc2190_r, { "Reserved field", "rfc2190.r", FT_UINT8, BASE_DEC, NULL, 0x0, "Reserved field that should contain zeroes", HFILL } }, { &hf_rfc2190_rr, { "Reserved field 2", "rfc2190.rr", FT_UINT16, BASE_DEC, NULL, 0x0, "Reserved field that should contain zeroes", HFILL } }, }; static gint *ett[] = { &ett_rfc2190, }; proto_register_subtree_array(ett, array_length(ett)); proto_rfc2190 = proto_register_protocol("H.263 RTP Payload header (RFC2190)", "RFC2190", "rfc2190"); proto_register_field_array(proto_rfc2190, hf, array_length(hf)); register_dissector("rfc2190", dissect_rfc2190, proto_rfc2190); }