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Diffstat (limited to 'epan/dissectors/packet-h263.c')
| -rw-r--r-- | epan/dissectors/packet-h263.c | 541 |
1 files changed, 541 insertions, 0 deletions
diff --git a/epan/dissectors/packet-h263.c b/epan/dissectors/packet-h263.c new file mode 100644 index 0000000000..e0feaf106a --- /dev/null +++ b/epan/dissectors/packet-h263.c @@ -0,0 +1,541 @@ +/* packet-h263.c + * + * Routines for ITU-T Recommendation H.263 dissection + * + * Copyright 2003 Niklas Ögren <niklas.ogren@7l.se> + * Seven Levels Consultants AB + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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 <glib.h> +#include <epan/packet.h> + +#include <stdio.h> +#include <string.h> + +#include "rtp_pt.h" +#include "iax2_codec_type.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)); + register_dissector("h263", dissect_h263, proto_h263); +} + +void +proto_reg_handoff_h263(void) +{ + dissector_handle_t h263_handle; + + h263_handle = find_dissector("h263"); + dissector_add("rtp.pt", PT_H263, h263_handle); + dissector_add("iax2.codec", AST_FORMAT_H263, h263_handle); +} |