/* packet-h263.c * * Routines for ITU-T Recommendation H.263 dissection * * Copyright 2003 Niklas Ögren * Seven Levels Consultants AB * * $Id: packet-h263.c,v 1.4 2003/08/25 21:48:44 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied structure from packet-h261.c * * 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 * ITU-T Recommendations and RFC 2190 */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include "rtp_pt.h" /* H.263 header fields */ static int proto_h263 = -1; /* Mode A header */ static int hf_h263_ftype = -1; static int hf_h263_pbframes = -1; static int hf_h263_sbit = -1; static int hf_h263_ebit = -1; static int hf_h263_srcformat = -1; static int hf_h263_picture_coding_type = -1; static int hf_h263_unrestricted_motion_vector = -1; static int hf_h263_syntax_based_arithmetic = -1; static int hf_h263_advanced_prediction = -1; static int hf_h263_r = -1; static int hf_h263_rr = -1; static int hf_h263_dbq = -1; static int hf_h263_trb = -1; static int hf_h263_tr = -1; /* Additional fields for Mode B or C header */ static int hf_h263_quant = -1; static int hf_h263_gobn = -1; static int hf_h263_mba = -1; static int hf_h263_hmv1 = -1; static int hf_h263_vmv1 = -1; static int hf_h263_hmv2 = -1; static int hf_h263_vmv2 = -1; static int hf_h263_data = -1; /* Source format types */ #define SRCFORMAT_FORB 0 /* forbidden */ #define SRCFORMAT_SQCIF 1 #define SRCFORMAT_QCIF 2 #define SRCFORMAT_CIF 3 #define SRCFORMAT_4CIF 4 #define SRCFORMAT_16CIF 5 static const value_string srcformat_vals[] = { { SRCFORMAT_FORB, "forbidden" }, { SRCFORMAT_SQCIF, "sub-QCIF 128x96" }, { SRCFORMAT_QCIF, "QCIF 176x144" }, { SRCFORMAT_CIF, "CIF 352x288" }, { SRCFORMAT_4CIF, "4CIF 704x576" }, { SRCFORMAT_16CIF, "16CIF 1408x1152" }, { 0, NULL }, }; /* H.263 fields defining a sub tree */ static gint ett_h263 = -1; static void dissect_h263( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) { proto_item *ti = NULL; proto_tree *h263_tree = NULL; unsigned int offset = 0; unsigned int h263_version = 0; h263_version = (tvb_get_guint8( tvb, offset ) & 0xc0 ) >> 6; if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) { col_set_str( pinfo->cinfo, COL_PROTOCOL, "H.263" ); } if( h263_version == 0x00) { if ( check_col( pinfo->cinfo, COL_INFO) ) { col_append_str( pinfo->cinfo, COL_INFO, " MODE A"); } } else if( h263_version == 0x02) { if ( check_col( pinfo->cinfo, COL_INFO) ) { col_append_str( pinfo->cinfo, COL_INFO, " MODE B"); } } else if( h263_version == 0x03) { if ( check_col( pinfo->cinfo, COL_INFO) ) { col_append_str( pinfo->cinfo, COL_INFO, " MODE C"); } } if ( tree ) { ti = proto_tree_add_item( tree, proto_h263, tvb, offset, -1, FALSE ); h263_tree = proto_item_add_subtree( ti, ett_h263 ); /* FBIT 1st octet, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_ftype, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x80 ); /* PBIT 1st octet, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_pbframes, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x40 ); /* SBIT 1st octet, 3 bits */ proto_tree_add_uint( h263_tree, hf_h263_sbit, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x38 ) >> 3 ); /* EBIT 1st octet, 3 bits */ proto_tree_add_uint( h263_tree, hf_h263_ebit, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x7 ); offset++; /* SRC 2nd octet, 3 bits */ proto_tree_add_uint( h263_tree, hf_h263_srcformat, tvb, offset, 1, tvb_get_guint8( tvb, offset ) >> 5 ); if(h263_version == 0x00) { /* MODE A */ /* I flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_picture_coding_type, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x10 ); /* U flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_unrestricted_motion_vector, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x08 ); /* S flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_syntax_based_arithmetic, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x04 ); /* A flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_advanced_prediction, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x02 ); /* Reserved 2nd octect, 1 bit + 3rd octect 3 bits */ proto_tree_add_uint( h263_tree, hf_h263_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( h263_tree, hf_h263_dbq, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x18 ) >> 3 ); /* TRB 3 octect, 3 bits */ proto_tree_add_uint( h263_tree, hf_h263_trb, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x07 ) ); offset++; /* TR 4 octect, 8 bits */ proto_tree_add_uint( h263_tree, hf_h263_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( h263_tree, hf_h263_quant, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x1f ); offset++; /* GOBN 3 octect, 5 bits */ proto_tree_add_uint( h263_tree, hf_h263_gobn, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0xf8 ) >> 3); /* MBA 3 octect, 3 bits + 4 octect 6 bits */ proto_tree_add_uint( h263_tree, hf_h263_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( h263_tree, hf_h263_r, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x3 ) ); offset++; /* I flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_picture_coding_type, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x80 ); /* U flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_unrestricted_motion_vector, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x40 ); /* S flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_syntax_based_arithmetic, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x20 ); /* A flag, 1 bit */ proto_tree_add_boolean( h263_tree, hf_h263_advanced_prediction, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x10 ); /* HMV1 5th octect, 4 bits + 6th octect 3 bits*/ proto_tree_add_uint( h263_tree, hf_h263_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( h263_tree, hf_h263_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( h263_tree, hf_h263_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( h263_tree, hf_h263_vmv2, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x7f ); offset++; if(h263_version == 0x03) { /* MODE C */ /* Reserved 9th to 11th octect, 8 + 8 + 3 bits */ proto_tree_add_uint( h263_tree, hf_h263_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( h263_tree, hf_h263_dbq, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x18 ) >>3 ); /* TRB 11th octect, 3 bits */ proto_tree_add_uint( h263_tree, hf_h263_trb, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x07 ); offset++; /* TR 12th octect, 8 bits */ proto_tree_add_uint( h263_tree, hf_h263_tr, tvb, offset, 1, tvb_get_guint8( tvb, offset ) ); offset++; } /* end mode c */ } /* end not mode a */ /* The rest of the packet is the H.263 stream */ proto_tree_add_item( h263_tree, hf_h263_data, tvb, offset, -1, FALSE ); } } void proto_register_h263(void) { static hf_register_info hf[] = { { &hf_h263_ftype, { "F", "h263.sbit", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Indicates the mode of the payload header (MODE A or B/C)", HFILL } }, { &hf_h263_pbframes, { "p/b frame", "h263.pbframes", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Optional PB-frames mode as defined by H.263 (MODE C)", HFILL } }, { &hf_h263_sbit, { "Start bit position", "h263.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_h263_ebit, { "End bit position", "h263.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_h263_srcformat, { "SRC format", "h263.srcformat", FT_UINT8, BASE_DEC, VALS(srcformat_vals), 0x0, "Source format specifies the resolution of the current picture.", HFILL } }, { &hf_h263_picture_coding_type, { "Inter-coded frame", "h263.picture_coding_type", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Picture coding type, intra-coded (false) or inter-coded (true)", HFILL } }, { &hf_h263_unrestricted_motion_vector, { "Motion vector", "h263.unrestricted_motion_vector", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Unrestricted Motion Vector option for current picture", HFILL } }, { &hf_h263_syntax_based_arithmetic, { "Syntax-based arithmetic coding", "h263.syntax_based_arithmetic", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Syntax-based Arithmetic Coding option for current picture", HFILL } }, { &hf_h263_advanced_prediction, { "Advanced prediction option", "h263.advanced_prediction", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Advanced Prediction option for current picture", HFILL } }, { &hf_h263_dbq, { "Differential quantization parameter", "h263.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_h263_trb, { "Temporal Reference for B frames", "h263.trb", FT_UINT8, BASE_DEC, NULL, 0x0, "Temporal Reference for the B frame as defined by H.263", HFILL } }, { &hf_h263_tr, { "Temporal Reference for P frames", "h263.tr", FT_UINT8, BASE_DEC, NULL, 0x0, "Temporal Reference for the P frame as defined by H.263", HFILL } }, { &hf_h263_quant, { "Quantizer", "h263.quant", FT_UINT8, BASE_DEC, NULL, 0x0, "Quantization value for the first MB coded at the starting of the packet.", HFILL } }, { &hf_h263_gobn, { "GOB Number", "h263.gobn", FT_UINT8, BASE_DEC, NULL, 0x0, "GOB number in effect at the start of the packet.", HFILL } }, { &hf_h263_mba, { "Macroblock address", "h263.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_h263_hmv1, { "Horizontal motion vector 1", "h263.hmv1", FT_UINT8, BASE_DEC, NULL, 0x0, "Horizontal motion vector predictor for the first MB in this packet ", HFILL } }, { &hf_h263_vmv1, { "Vertical motion vector 1", "h263.vmv1", FT_UINT8, BASE_DEC, NULL, 0x0, "Vertical motion vector predictor for the first MB in this packet ", HFILL } }, { &hf_h263_hmv2, { "Horizontal motion vector 2", "h263.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_h263_vmv2, { "Vertical motion vector 2", "h263.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_h263_r, { "Reserved field", "h263.r", FT_UINT8, BASE_DEC, NULL, 0x0, "Reserved field that houls contain zeroes", HFILL } }, { &hf_h263_rr, { "Reserved field 2", "h263.rr", FT_UINT16, BASE_DEC, NULL, 0x0, "Reserved field that should contain zeroes", HFILL } }, { &hf_h263_data, { "H.263 stream", "h263.stream", FT_BYTES, BASE_NONE, NULL, 0x0, "The H.263 stream including its Picture, GOB or Macro block start code.", HFILL } }, }; static gint *ett[] = { &ett_h263, }; proto_h263 = proto_register_protocol("ITU-T Recommendation H.263 RTP Payload header (RFC2190)", "H.263", "h263"); proto_register_field_array(proto_h263, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_h263(void) { dissector_handle_t h263_handle; h263_handle = create_dissector_handle(dissect_h263, proto_h263); dissector_add("rtp.pt", PT_H263, h263_handle); }