diff options
Diffstat (limited to 'epan/dissectors/packet-rfc2190.c')
| -rw-r--r-- | epan/dissectors/packet-rfc2190.c | 590 |
1 files changed, 590 insertions, 0 deletions
diff --git a/epan/dissectors/packet-rfc2190.c b/epan/dissectors/packet-rfc2190.c new file mode 100644 index 00000000..f0037962 --- /dev/null +++ b/epan/dissectors/packet-rfc2190.c @@ -0,0 +1,590 @@ +/* packet-rfc2190.c + * + * Routines for RFC2190-encapsulated H.263 dissection + * + * Copyright 2003 Niklas Ogren <niklas.ogren@7l.se> + * Seven Levels Consultants AB + * + * Copyright 2008 Richard van der Hoff, MX Telecom + * <richardv@mxtelecom.com> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +/* + * This dissector tries to dissect the H.263 protocol according to + * RFC 2190, https://www.ietf.org/rfc/rfc2190 + */ + +#include "config.h" + +#include <epan/packet.h> + +#include <epan/rtp_pt.h> +#include <epan/iax2_codec_type.h> + +#include "packet-h263.h" + +void proto_register_rfc2190(void); +void proto_reg_handoff_rfc2190(void); + +/* 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_modeA = -1; +static int hf_rfc2190_unrestricted_motion_vector_modeA = -1; +static int hf_rfc2190_syntax_based_arithmetic_modeA = -1; +static int hf_rfc2190_advanced_prediction_modeA = -1; +static int hf_rfc2190_r_modeA = -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_picture_coding_type_modeB = -1; +static int hf_rfc2190_unrestricted_motion_vector_modeB = -1; +static int hf_rfc2190_syntax_based_arithmetic_modeB = -1; +static int hf_rfc2190_advanced_prediction_modeB = -1; +static int hf_rfc2190_r_modeB = -1; +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 dissector_handle_t rfc2190_handle; + + +static int +dissect_rfc2190( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_ ) +{ + proto_item *ti = NULL; + proto_tree *rfc2190_tree = NULL; + int offset = 0; + unsigned int rfc2190_version = 0; + tvbuff_t *next_tvb; + int hdr_len = 0; + + rfc2190_version = (tvb_get_guint8( tvb, offset ) & 0xc0 ) >> 6; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "H.263 "); + + /* Three formats (mode A, mode B and mode C) are defined for H.263 + * payload header. In mode A, an H.263 payload header of four bytes is + * present before actual compressed H.263 video bitstream in a packet. + * It allows fragmentation at GOB boundaries. In mode B, an eight byte + * H.263 payload header is used and each packet starts at MB boundaries + * without the PB-frames option. Finally, a twelve byte H.263 payload + * header is defined in mode C to support fragmentation at MB boundaries + * for frames that are coded with the PB-frames option. + */ + if( rfc2190_version == 0x00) { + col_append_str( pinfo->cinfo, COL_INFO, "MODE A "); + hdr_len = 4; + } + else if( rfc2190_version == 0x02) { + col_append_str( pinfo->cinfo, COL_INFO, "MODE B "); + hdr_len = 8; + } + else if( rfc2190_version == 0x03) { + col_append_str( pinfo->cinfo, COL_INFO, "MODE C "); + hdr_len = 12; + } + + if ( tree ) { + ti = proto_tree_add_item( tree, proto_rfc2190, tvb, offset, hdr_len, ENC_NA ); + rfc2190_tree = proto_item_add_subtree( ti, ett_rfc2190 ); + + /* FBIT 1st octet, 1 bit */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_ftype, tvb, offset, 1, ENC_BIG_ENDIAN ); + /* PBIT 1st octet, 1 bit */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_pbframes, tvb, offset, 1, ENC_BIG_ENDIAN ); + /* SBIT 1st octet, 3 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_sbit, tvb, offset, 1, ENC_BIG_ENDIAN ); + /* EBIT 1st octet, 3 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_ebit, tvb, offset, 1, ENC_BIG_ENDIAN ); + offset++; + + /* SRC 2nd octet, 3 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_srcformat, tvb, offset, 1, ENC_BIG_ENDIAN ); + + if(rfc2190_version == 0x00) { /* MODE A */ + /* I flag, 1 bit */ + proto_tree_add_item(rfc2190_tree, hf_rfc2190_picture_coding_type_modeA, tvb, offset, 1, ENC_BIG_ENDIAN); + /* U flag, 1 bit */ + proto_tree_add_item(rfc2190_tree, hf_rfc2190_unrestricted_motion_vector_modeA, tvb, offset, 1, ENC_BIG_ENDIAN); + /* S flag, 1 bit */ + proto_tree_add_item(rfc2190_tree, hf_rfc2190_syntax_based_arithmetic_modeA, tvb, offset, 1, ENC_BIG_ENDIAN); + /* A flag, 1 bit */ + proto_tree_add_item(rfc2190_tree, hf_rfc2190_advanced_prediction_modeA, tvb, offset, 1, ENC_BIG_ENDIAN); + + /* Reserved 2nd octet, 1 bit + 3rd octet 3 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_r_modeA, tvb, offset, 2, ENC_BIG_ENDIAN); + + offset++; + + /* DBQ 3 octet, 2 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_dbq, tvb, offset, 1, ENC_BIG_ENDIAN ); + /* TRB 3 octet, 3 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_trb, tvb, offset, 1, ENC_BIG_ENDIAN ); + offset++; + + /* TR 4 octet, 8 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_tr, tvb, offset, 1, ENC_NA ); + + offset++; + + } else { /* MODE B or MODE C */ + /* QUANT 2 octet, 5 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_quant, tvb, offset, 1, ENC_NA); + + offset++; + + /* GOBN 3 octet, 5 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_gobn, tvb, offset, 1, ENC_NA); + /* MBA 3 octet, 3 bits + 4 octet 6 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_mba, tvb, offset, 2, ENC_BIG_ENDIAN ); + + offset++; + + /* Reserved 4th octet, 2 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_r_modeB, tvb, offset, 1, ENC_NA); + + offset++; + + /* I flag, 1 bit */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_picture_coding_type_modeB, tvb, offset, 1, ENC_BIG_ENDIAN); + /* U flag, 1 bit */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_unrestricted_motion_vector_modeB, tvb, offset, 1, ENC_BIG_ENDIAN); + /* S flag, 1 bit */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_syntax_based_arithmetic_modeB, tvb, offset, 1, ENC_BIG_ENDIAN); + /* A flag, 1 bit */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_advanced_prediction_modeB, tvb, offset, 1, ENC_BIG_ENDIAN); + + /* HMV1 5th octet, 4 bits + 6th octet 3 bits*/ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_hmv1, tvb, offset, 2, ENC_BIG_ENDIAN); + + offset++; + + /* VMV1 6th octet, 5 bits + 7th octet 2 bits*/ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_vmv1, tvb, offset, 2, ENC_BIG_ENDIAN); + + offset++; + + /* HMV2 7th octet, 6 bits + 8th octet 1 bit*/ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_hmv2, tvb, offset, 2, ENC_BIG_ENDIAN); + + offset++; + + /* VMV2 8th octet, 7 bits*/ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_vmv2, tvb, offset, 1, ENC_NA); + + offset++; + + if(rfc2190_version == 0x03) { /* MODE C */ + /* Reserved 9th to 11th octet, 8 + 8 + 3 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_rr, tvb, offset, 3, ENC_BIG_ENDIAN); + + offset+=2; + + /* DBQ 11th octet, 2 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_dbq, tvb, offset, 1, ENC_BIG_ENDIAN ); + /* TRB 11th octet, 3 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_trb, tvb, offset, 1, ENC_BIG_ENDIAN ); + + offset++; + + /* TR 12th octet, 8 bits */ + proto_tree_add_item( rfc2190_tree, hf_rfc2190_tr, tvb, offset, 1, ENC_NA ); + + 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_remaining( tvb, offset); + call_dissector(h263_handle,next_tvb,pinfo,tree); + return tvb_captured_length(tvb); +} + +void +proto_reg_handoff_rfc2190(void) +{ + dissector_add_uint("rtp.pt", PT_H263, rfc2190_handle); + dissector_add_uint("iax2.codec", AST_FORMAT_H263, rfc2190_handle); + + h263_handle = find_dissector_add_dependency("h263data", proto_rfc2190); +} + + +void +proto_register_rfc2190(void) +{ + static hf_register_info hf[] = { + { + &hf_rfc2190_ftype, + { + "F", + "rfc2190.ftype", + FT_BOOLEAN, + 8, + NULL, + 0x80, + "Indicates the mode of the payload header (MODE A or B/C)", HFILL + } + }, + { + &hf_rfc2190_pbframes, + { + "p/b frame", + "rfc2190.pbframes", + FT_BOOLEAN, + 8, + NULL, + 0x40, + "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, + 0x38, + "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, + 0x7, + "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), + 0xe0, + "Source format specifies the resolution of the current picture.", HFILL + } + }, + { + &hf_rfc2190_picture_coding_type_modeA, + { + "Inter-coded frame", + "rfc2190.picture_coding_type", + FT_BOOLEAN, + 8, + NULL, + 0x10, + "Picture coding type, intra-coded (false) or inter-coded (true)", HFILL + } + }, + { + &hf_rfc2190_unrestricted_motion_vector_modeA, + { + "Motion vector", + "rfc2190.unrestricted_motion_vector", + FT_BOOLEAN, + 8, + NULL, + 0x08, + "Unrestricted Motion Vector option for current picture", HFILL + } + }, + { + &hf_rfc2190_syntax_based_arithmetic_modeA, + { + "Syntax-based arithmetic coding", + "rfc2190.syntax_based_arithmetic", + FT_BOOLEAN, + 8, + NULL, + 0x04, + "Syntax-based Arithmetic Coding option for current picture", HFILL + } + }, + { + &hf_rfc2190_advanced_prediction_modeA, + { + "Advanced prediction option", + "rfc2190.advanced_prediction", + FT_BOOLEAN, + 8, + NULL, + 0x02, + "Advanced Prediction option for current picture", HFILL + } + }, + { + &hf_rfc2190_picture_coding_type_modeB, + { + "Inter-coded frame", + "rfc2190.picture_coding_type", + FT_BOOLEAN, + 8, + NULL, + 0x80, + "Picture coding type, intra-coded (false) or inter-coded (true)", HFILL + } + }, + { + &hf_rfc2190_unrestricted_motion_vector_modeB, + { + "Motion vector", + "rfc2190.unrestricted_motion_vector", + FT_BOOLEAN, + 8, + NULL, + 0x40, + "Unrestricted Motion Vector option for current picture", HFILL + } + }, + { + &hf_rfc2190_syntax_based_arithmetic_modeB, + { + "Syntax-based arithmetic coding", + "rfc2190.syntax_based_arithmetic", + FT_BOOLEAN, + 8, + NULL, + 0x20, + "Syntax-based Arithmetic Coding option for current picture", HFILL + } + }, + { + &hf_rfc2190_advanced_prediction_modeB, + { + "Advanced prediction option", + "rfc2190.advanced_prediction", + FT_BOOLEAN, + 8, + NULL, + 0x10, + "Advanced Prediction option for current picture", HFILL + } + }, + { + &hf_rfc2190_dbq, + { + "Differential quantization parameter", + "rfc2190.dbq", + FT_UINT8, + BASE_DEC, + NULL, + 0x18, + "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, + 0x07, + "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, + 0x1F, + "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, + 0xF8, + "GOB number in effect at the start of the packet.", HFILL + } + }, + { + &hf_rfc2190_mba, + { + "Macroblock address", + "rfc2190.mba", + FT_UINT16, + BASE_DEC, + NULL, + 0x3FE0, + "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_UINT16, + BASE_DEC, + NULL, + 0x0FE0, + "Horizontal motion vector predictor for the first MB in this packet", HFILL + } + }, + { + &hf_rfc2190_vmv1, + { + "Vertical motion vector 1", + "rfc2190.vmv1", + FT_UINT16, + BASE_DEC, + NULL, + 0x01FC, + "Vertical motion vector predictor for the first MB in this packet", HFILL + } + }, + { + &hf_rfc2190_hmv2, + { + "Horizontal motion vector 2", + "rfc2190.hmv2", + FT_UINT16, + BASE_DEC, + NULL, + 0x03F8, + "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, + 0x7F, + "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_modeA, + { + "Reserved field", + "rfc2190.r", + FT_UINT16, + BASE_DEC, + NULL, + 0x01E0, + "Reserved field that should contain zeroes", HFILL + } + }, + { + &hf_rfc2190_r_modeB, + { + "Reserved field", + "rfc2190.r", + FT_UINT8, + BASE_DEC, + NULL, + 0x03, + "Reserved field that should contain zeroes", HFILL + } + }, + { + &hf_rfc2190_rr, + { + "Reserved field 2", + "rfc2190.rr", + FT_UINT24, + BASE_DEC, + NULL, + 0x07FFFF, + "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)", + "H.263 (RFC2190)", "rfc2190"); + + proto_register_field_array(proto_rfc2190, hf, array_length(hf)); + rfc2190_handle = register_dissector("rfc2190", dissect_rfc2190, proto_rfc2190); +} + +/* + * Editor modelines - https://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: + */ |