1505 lines
40 KiB
C
1505 lines
40 KiB
C
/* packet-h263.c
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*
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* Routines for ITU-T Recommendation H.263 dissection
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*
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* Copyright 2003 Niklas Ögren <niklas.ogren@7l.se>
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* Seven Levels Consultants AB
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied structure from packet-h261.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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* This dissector tries to dissect the H.263 protocol according to
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* ITU-T Recommendations and RFC 2190 and
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* http://www.ietf.org/rfc/rfc4629.txt?number=4629
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <stdio.h>
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#include <string.h>
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#include <epan/emem.h>
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#include <epan/rtp_pt.h>
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#include <epan/iax2_codec_type.h>
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static void dissect_h263_data( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree );
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/* H.263 header fields */
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static int proto_h263 = -1;
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static int proto_h263P = -1;
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static int proto_h263_data = -1;
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/* Mode A header */
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static int hf_h263_ftype = -1;
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static int hf_h263_pbframes = -1;
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static int hf_h263_sbit = -1;
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static int hf_h263_ebit = -1;
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static int hf_h263_srcformat = -1;
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static int hf_h263_picture_coding_type = -1;
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static int hf_h263_unrestricted_motion_vector = -1;
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static int hf_h263_syntax_based_arithmetic = -1;
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static int hf_h263_advanced_prediction = -1;
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static int hf_h263_r = -1;
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static int hf_h263_rr = -1;
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static int hf_h263_dbq = -1;
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static int hf_h263_trb = -1;
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static int hf_h263_tr = -1;
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/* Additional fields for Mode B or C header */
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static int hf_h263_quant = -1;
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static int hf_h263_gobn = -1;
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static int hf_h263_mba = -1;
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static int hf_h263_hmv1 = -1;
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static int hf_h263_vmv1 = -1;
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static int hf_h263_hmv2 = -1;
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static int hf_h263_vmv2 = -1;
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/* Fields for the data section */
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static int hf_h263_psc = -1;
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static int hf_h263_gbsc = -1;
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static int hf_h263_TR =-1;
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static int hf_h263_split_screen_indicator = -1;
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static int hf_h263_document_camera_indicator = -1;
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static int hf_h263_full_picture_freeze_release = -1;
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static int hf_h263_source_format = -1;
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static int hf_h263_payload_picture_coding_type = -1;
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static int hf_h263_opt_unres_motion_vector_mode = -1;
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static int hf_h263_syntax_based_arithmetic_coding_mode = -1;
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static int hf_h263_optional_advanced_prediction_mode = -1;
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static int hf_h263_PB_frames_mode = -1;
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static int hf_h263_data = -1;
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static int hf_h263_payload = -1;
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static int hf_h263_GN = -1;
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static int hf_h263_UFEP = -1;
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static int hf_h263_opptype = -1;
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/* H.263 RFC 4629 fields */
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static int hf_h263P_payload = -1;
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static int hf_h263P_rr = -1;
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static int hf_h263P_pbit = -1;
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static int hf_h263P_vbit = -1;
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static int hf_h263P_plen = -1;
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static int hf_h263P_pebit = -1;
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static int hf_h263P_tid = -1;
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static int hf_h263P_trun = -1;
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static int hf_h263P_s = -1;
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static int hf_h263P_extra_hdr = -1;
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static int hf_h263P_PSC = -1;
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static int hf_h263P_TR = -1;
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/* Source format types */
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#define H263_SRCFORMAT_FORB 0 /* forbidden */
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#define H263_SRCFORMAT_SQCIF 1
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#define H263_SRCFORMAT_QCIF 2
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#define H263_SRCFORMAT_CIF 3
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#define H263_SRCFORMAT_4CIF 4
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#define H263_SRCFORMAT_16CIF 5
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#define H263_PLUSPTYPE 7
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static const value_string srcformat_vals[] =
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{
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{ H263_SRCFORMAT_FORB, "forbidden" },
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{ H263_SRCFORMAT_SQCIF, "sub-QCIF 128x96" },
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{ H263_SRCFORMAT_QCIF, "QCIF 176x144" },
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{ H263_SRCFORMAT_CIF, "CIF 352x288" },
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{ H263_SRCFORMAT_4CIF, "4CIF 704x576" },
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{ H263_SRCFORMAT_16CIF, "16CIF 1408x1152" },
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{ 6, "Reserved",},
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{ H263_PLUSPTYPE, "extended PTYPE" },
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{ 0, NULL },
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};
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static const value_string h263_ufep_vals[] =
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{
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{ 0, "Only MPPTYPE included" },
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{ 1, "All extended PTYPE fields are included" },
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{ 0, NULL },
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};
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static const true_false_string on_off_flg = {
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"On",
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"Off"
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};
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static const true_false_string picture_coding_type_flg = {
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"INTER (P-picture)",
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"INTRA (I-picture)"
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};
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static const value_string picture_coding_type_vals[] =
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{
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{ 0, "I-Frame" },
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{ 1, "P-frame" },
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{ 0, NULL },
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};
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static const true_false_string PB_frames_mode_flg = {
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"PB-frame",
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"Normal I- or P-picture"
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};
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/* H.263 fields defining a sub tree */
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static gint ett_h263 = -1;
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static gint ett_h263_payload = -1;
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static gint ett_h263_optype = -1;
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/* H.263-1998 fields defining a sub tree */
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static gint ett_h263P = -1;
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static gint ett_h263P_extra_hdr = -1;
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static gint ett_h263P_payload = -1;
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static gint ett_h263P_data = -1;
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static void
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dissect_h263( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
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{
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proto_item *ti = NULL;
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proto_tree *h263_tree = NULL;
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unsigned int offset = 0;
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unsigned int h263_version = 0;
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tvbuff_t *next_tvb;
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h263_version = (tvb_get_guint8( tvb, offset ) & 0xc0 ) >> 6;
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if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) {
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "H.263 " );
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}
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if( h263_version == 0x00) {
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if ( check_col( pinfo->cinfo, COL_INFO) ) {
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col_append_str( pinfo->cinfo, COL_INFO, "MODE A ");
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}
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}
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else if( h263_version == 0x02) {
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if ( check_col( pinfo->cinfo, COL_INFO) ) {
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col_append_str( pinfo->cinfo, COL_INFO, "MODE B ");
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}
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}
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else if( h263_version == 0x03) {
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if ( check_col( pinfo->cinfo, COL_INFO) ) {
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col_append_str( pinfo->cinfo, COL_INFO, "MODE C ");
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}
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}
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if ( tree ) {
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ti = proto_tree_add_item( tree, proto_h263, tvb, offset, -1, FALSE );
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h263_tree = proto_item_add_subtree( ti, ett_h263 );
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/* FBIT 1st octet, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_ftype, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x80 );
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/* PBIT 1st octet, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_pbframes, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x40 );
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/* SBIT 1st octet, 3 bits */
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proto_tree_add_uint( h263_tree, hf_h263_sbit, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x38 ) >> 3 );
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/* EBIT 1st octet, 3 bits */
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proto_tree_add_uint( h263_tree, hf_h263_ebit, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x7 );
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offset++;
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/* SRC 2nd octet, 3 bits */
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proto_tree_add_uint( h263_tree, hf_h263_srcformat, tvb, offset, 1, tvb_get_guint8( tvb, offset ) >> 5 );
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if(h263_version == 0x00) { /* MODE A */
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/* I flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_picture_coding_type, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x10 );
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/* U flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_unrestricted_motion_vector, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x08 );
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/* S flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_syntax_based_arithmetic, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x04 );
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/* A flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_advanced_prediction, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x02 );
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/* Reserved 2nd octect, 1 bit + 3rd octect 3 bits */
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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 ) );
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offset++;
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/* DBQ 3 octect, 2 bits */
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proto_tree_add_uint( h263_tree, hf_h263_dbq, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x18 ) >> 3 );
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/* TRB 3 octect, 3 bits */
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proto_tree_add_uint( h263_tree, hf_h263_trb, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x07 ) );
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offset++;
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/* TR 4 octect, 8 bits */
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proto_tree_add_uint( h263_tree, hf_h263_tr, tvb, offset, 1, tvb_get_guint8( tvb, offset ) );
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offset++;
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} else { /* MODE B or MODE C */
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/* QUANT 2 octect, 5 bits */
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proto_tree_add_uint( h263_tree, hf_h263_quant, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x1f );
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offset++;
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/* GOBN 3 octect, 5 bits */
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proto_tree_add_uint( h263_tree, hf_h263_gobn, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0xf8 ) >> 3);
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/* MBA 3 octect, 3 bits + 4 octect 6 bits */
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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 ) );
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offset++;
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/* Reserved 4th octect, 2 bits */
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proto_tree_add_uint( h263_tree, hf_h263_r, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x3 ) );
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offset++;
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/* I flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_picture_coding_type, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x80 );
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/* U flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_unrestricted_motion_vector, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x40 );
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/* S flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_syntax_based_arithmetic, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x20 );
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/* A flag, 1 bit */
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proto_tree_add_boolean( h263_tree, hf_h263_advanced_prediction, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x10 );
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/* HMV1 5th octect, 4 bits + 6th octect 3 bits*/
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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) );
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offset++;
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/* VMV1 6th octect, 5 bits + 7th octect 2 bits*/
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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) );
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offset++;
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/* HMV2 7th octect, 6 bits + 8th octect 1 bit*/
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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) );
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offset++;
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/* VMV2 8th octect, 7 bits*/
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proto_tree_add_uint( h263_tree, hf_h263_vmv2, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x7f );
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offset++;
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if(h263_version == 0x03) { /* MODE C */
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/* Reserved 9th to 11th octect, 8 + 8 + 3 bits */
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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 ) );
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offset+=2;
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/* DBQ 11th octect, 2 bits */
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proto_tree_add_uint( h263_tree, hf_h263_dbq, tvb, offset, 1, ( tvb_get_guint8( tvb, offset ) & 0x18 ) >>3 );
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/* TRB 11th octect, 3 bits */
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proto_tree_add_uint( h263_tree, hf_h263_trb, tvb, offset, 1, tvb_get_guint8( tvb, offset ) & 0x07 );
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offset++;
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/* TR 12th octect, 8 bits */
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proto_tree_add_uint( h263_tree, hf_h263_tr, tvb, offset, 1, tvb_get_guint8( tvb, offset ) );
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offset++;
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} /* end mode c */
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} /* end not mode a */
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/* The rest of the packet is the H.263 stream */
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next_tvb = tvb_new_subset( tvb, offset, tvb_length(tvb) - offset, tvb_reported_length(tvb) - offset);
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dissect_h263_data( next_tvb, pinfo, h263_tree );
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}
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}
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#define cVALS(x) (const value_string*)(x)
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|
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proto_item *
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h263_proto_tree_add_bits(proto_tree *tree, int hf_index, tvbuff_t *tvb, gint bit_offset, gint no_of_bits)
|
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{
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gint offset;
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guint length;
|
||
char *str;
|
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header_field_info *hfinfo;
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guint32 value = 0;
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int bit;
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guint32 mask, tmp;
|
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gboolean is_bytealigned = FALSE;
|
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guint8 mask8 = 0xff;
|
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guint16 mask16 = 0xffff;
|
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guint32 mask24 = 0xffffff;
|
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guint32 mask32 = 0xffffffff;
|
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guint8 shift;
|
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int i;
|
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const char *format = NULL;
|
||
|
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if((bit_offset&0x7)==0)
|
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is_bytealigned = TRUE;
|
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|
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hfinfo = proto_registrar_get_nth(hf_index);
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|
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offset = bit_offset>>3;
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length = ((bit_offset&0x7)+no_of_bits)>>3;
|
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length = length +1;
|
||
|
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if (no_of_bits < 2){
|
||
/* Single bit */
|
||
mask8 = mask8 >>(bit_offset&0x7);
|
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value = tvb_get_guint8(tvb,offset) & mask8;
|
||
mask = 0x80;
|
||
shift = 8-((bit_offset + no_of_bits)&0x7);
|
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value = value >> shift;
|
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mask = mask >> shift;
|
||
}else if(no_of_bits < 9){
|
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/* One or 2 bytes */
|
||
if(length == 1){
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/* Spans 1 byte */
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mask8 = mask8>>(bit_offset&0x7);
|
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value = tvb_get_guint8(tvb,offset)&mask8;
|
||
mask = 0x80;
|
||
}else{
|
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/* Spans 2 bytes */
|
||
mask16 = mask16>>(bit_offset&0x7);
|
||
value = tvb_get_ntohs(tvb,offset) & mask16;
|
||
mask = 0x8000;
|
||
}
|
||
shift = 8-((bit_offset + no_of_bits)&0x7);
|
||
value = value >> shift;
|
||
mask = mask >> shift;
|
||
|
||
}else if (no_of_bits < 17){
|
||
/* 2 or 3 bytes */
|
||
if(length == 2){
|
||
/* Spans 2 bytes */
|
||
mask16 = mask16>>(bit_offset&0x7);
|
||
value = tvb_get_ntohs(tvb,offset) & mask16;
|
||
mask = 0x8000;
|
||
}else{
|
||
/* Spans 3 bytes */
|
||
mask24 = mask24>>(bit_offset&0x7);
|
||
value = tvb_get_ntoh24(tvb,offset) & mask24;
|
||
mask = 0x800000;
|
||
}
|
||
shift = 8-((bit_offset + no_of_bits)&0x7);
|
||
|
||
value = value >> shift;
|
||
mask = mask >> shift;
|
||
|
||
}else if (no_of_bits < 25){
|
||
/* 3 or 4 bytes */
|
||
if(length == 3){
|
||
/* Spans 3 bytes */
|
||
mask24 = mask24>>(bit_offset&0x7);
|
||
value = tvb_get_ntoh24(tvb,offset) & mask24;
|
||
mask = 0x800000;
|
||
}else{
|
||
/* Spans 4 bytes */
|
||
mask32 = mask32>>(bit_offset&0x7);
|
||
value = tvb_get_ntohl(tvb,offset) & mask32;
|
||
mask = 0x80000000;
|
||
}
|
||
shift = 8-((bit_offset + no_of_bits)&0x7);
|
||
|
||
value = value >> shift;
|
||
mask = mask >> shift;
|
||
|
||
}else if (no_of_bits < 33){
|
||
/* 4 or 5 bytes */
|
||
if(length == 4){
|
||
/* Spans 4 bytes */
|
||
mask32 = mask32>>(bit_offset&0x7);
|
||
value = tvb_get_ntohl(tvb,offset) & mask32;
|
||
mask = 0x80000000;
|
||
}else{
|
||
/* Spans 5 bytes
|
||
* Does not handle unaligned bits over 24
|
||
*/
|
||
DISSECTOR_ASSERT_NOT_REACHED();
|
||
}
|
||
shift = 8-((bit_offset + no_of_bits)&0x7);
|
||
|
||
value = value >> shift;
|
||
mask = mask >> shift;
|
||
|
||
}else{
|
||
g_assert_not_reached();
|
||
}
|
||
|
||
/* prepare the string */
|
||
str=ep_alloc(256);
|
||
g_snprintf(str, 256, "");
|
||
for(bit=0;bit<((int)(bit_offset&0x07));bit++){
|
||
if(bit&&(!(bit%4))){
|
||
strcat(str, " ");
|
||
}
|
||
strcat(str,".");
|
||
mask = mask>>1;
|
||
}
|
||
/* read the bits for the int */
|
||
for(i=0;i<no_of_bits;i++){
|
||
if(bit&&(!(bit%4))){
|
||
strcat(str, " ");
|
||
}
|
||
if(bit&&(!(bit%8))){
|
||
strcat(str, " ");
|
||
}
|
||
bit++;
|
||
tmp = value & mask;
|
||
if(tmp != 0){
|
||
strcat(str, "1");
|
||
} else {
|
||
strcat(str, "0");
|
||
}
|
||
mask = mask>>1;
|
||
}
|
||
for(;bit%8;bit++){
|
||
if(bit&&(!(bit%4))){
|
||
strcat(str, " ");
|
||
}
|
||
strcat(str,".");
|
||
}
|
||
|
||
|
||
strcat(str," = ");
|
||
strcat(str,hfinfo->name);
|
||
if (no_of_bits== 1){
|
||
/* Boolean field */
|
||
if (hfinfo->strings) {
|
||
const true_false_string *tfstring = &tfs_true_false;
|
||
tfstring = (const struct true_false_string*) hfinfo->strings;
|
||
|
||
return proto_tree_add_boolean_format(tree, hf_index, tvb, offset, length, value,
|
||
"%s: %s",
|
||
str,
|
||
value ? tfstring->true_string : tfstring->false_string);
|
||
}
|
||
|
||
}
|
||
/* 2 - 32 bits field */
|
||
|
||
if (hfinfo->strings) {
|
||
return proto_tree_add_uint_format(tree, hf_index, tvb, offset, length, value,
|
||
"%s: %s",
|
||
str,
|
||
val_to_str(value, cVALS(hfinfo->strings), "Unknown"), value);
|
||
}
|
||
switch(hfinfo->display){
|
||
case BASE_DEC:
|
||
return proto_tree_add_uint_format(tree, hf_index, tvb, offset, length, value,
|
||
"%s: %u",
|
||
str,
|
||
value);
|
||
break;
|
||
case BASE_HEX:
|
||
return proto_tree_add_uint_format(tree, hf_index, tvb, offset, length, value,
|
||
"%s: %x",
|
||
str,
|
||
value);
|
||
break;
|
||
default:
|
||
DISSECTOR_ASSERT_NOT_REACHED();
|
||
return NULL;
|
||
;
|
||
}
|
||
|
||
}
|
||
|
||
/*
|
||
* Length is used for the "Extra header" otherwise set to -1.
|
||
*/
|
||
int
|
||
dissect_h263_picture_layer( tvbuff_t *tvb, proto_tree *tree, gint offset, gint length, gboolean is_rfc4626)
|
||
{
|
||
proto_tree *h263_opptype_tree = NULL;
|
||
proto_item *opptype_item = NULL;
|
||
unsigned int offset_in_bits = offset << 3;
|
||
guint8 source_format;
|
||
guint16 ufep;
|
||
|
||
if(is_rfc4626){
|
||
/* PC 1000 00xx */
|
||
h263_proto_tree_add_bits(tree, hf_h263_psc, tvb, offset_in_bits, 6);
|
||
offset_in_bits = offset_in_bits +6;
|
||
|
||
}else{
|
||
/* Check for PSC, PSC is a word of 22 bits.
|
||
* Its value is 0000 0000 0000 0000' 1000 00xx xxxx xxxx.
|
||
*/
|
||
h263_proto_tree_add_bits(tree, hf_h263_psc, tvb, offset_in_bits, 22);
|
||
offset_in_bits = offset_in_bits +22;
|
||
|
||
}
|
||
h263_proto_tree_add_bits(tree, hf_h263_TR, tvb, offset_in_bits, 8);
|
||
offset_in_bits = offset_in_bits +8;
|
||
/*
|
||
* Bit 1: Always "1", in order to avoid start code emulation.
|
||
* Bit 2: Always "0", for distinction with Recommendation H.261.
|
||
*/
|
||
offset_in_bits = offset_in_bits +2;
|
||
/* Bit 3: Split screen indicator, "0" off, "1" on. */
|
||
h263_proto_tree_add_bits( tree, hf_h263_split_screen_indicator, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
/* Bit 4: Document camera indicator, */
|
||
h263_proto_tree_add_bits( tree, hf_h263_document_camera_indicator, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
/* Bit 5: Full Picture Freeze Release, "0" off, "1" on. */
|
||
h263_proto_tree_add_bits( tree, hf_h263_full_picture_freeze_release, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
/* Bits 6-8: Source Format, "000" forbidden, "001" sub-QCIF, "010" QCIF, "011" CIF,
|
||
* "100" 4CIF, "101" 16CIF, "110" reserved, "111" extended PTYPE.
|
||
*/
|
||
h263_proto_tree_add_bits( tree, hf_h263_source_format, tvb, offset_in_bits, 3);
|
||
offset_in_bits = offset_in_bits +3;
|
||
source_format = (tvb_get_guint8(tvb,(offset_in_bits>>3)& 0x1c)>>2);
|
||
if (source_format != H263_PLUSPTYPE){
|
||
/* Not extended PTYPE */
|
||
/* Bit 9: Picture Coding Type, "0" INTRA (I-picture), "1" INTER (P-picture). */
|
||
h263_proto_tree_add_bits( tree, hf_h263_payload_picture_coding_type, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
/* Bit 10: Optional Unrestricted Motion Vector mode (see Annex D), "0" off, "1" on. */
|
||
h263_proto_tree_add_bits( tree, hf_h263_opt_unres_motion_vector_mode, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
/* Bit 11: Optional Syntax-based Arithmetic Coding mode (see Annex E), "0" off, "1" on.*/
|
||
h263_proto_tree_add_bits( tree, hf_h263_syntax_based_arithmetic_coding_mode, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
/* Bit 12: Optional Advanced Prediction mode (see Annex F), "0" off, "1" on.*/
|
||
h263_proto_tree_add_bits( tree, hf_h263_optional_advanced_prediction_mode, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
/* Bit 13: Optional PB-frames mode (see Annex G), "0" normal I- or P-picture, "1" PB-frame.*/
|
||
h263_proto_tree_add_bits( tree, hf_h263_PB_frames_mode, tvb, offset_in_bits, 1);
|
||
offset_in_bits++;
|
||
}else{
|
||
/* Extended PTYPE
|
||
* Update Full Extended PTYPE (UFEP) (3 bits)
|
||
*/
|
||
ufep = (tvb_get_ntohs(tvb,offset)&0x0380)>>7;
|
||
/* .... ..xx x... .... */
|
||
h263_proto_tree_add_bits( tree, hf_h263_UFEP, tvb, offset_in_bits, 3);
|
||
offset_in_bits = offset_in_bits +3;
|
||
if(ufep==1){
|
||
/* The Optional Part of PLUSPTYPE (OPPTYPE) (18 bits)
|
||
*/
|
||
/* .xxx xxxx xxxx xxxx xxx. .... */
|
||
opptype_item = h263_proto_tree_add_bits( tree, hf_h263_opptype, tvb, offset_in_bits, 18);
|
||
h263_opptype_tree = proto_item_add_subtree( opptype_item, ett_h263_optype );
|
||
/*
|
||
* If UFEP is "001", then the following bits are present in PLUSPTYPE:
|
||
* Bits 1-3 Source Format, "000" reserved, "001" sub-QCIF, "010" QCIF, "011" CIF,
|
||
* "100" 4CIF, "101" 16CIF, "110" custom source format, "111" reserved;
|
||
*/
|
||
h263_proto_tree_add_bits( h263_opptype_tree, hf_h263_source_format, tvb, offset_in_bits, 3);
|
||
offset_in_bits = offset_in_bits +3;
|
||
offset_in_bits = offset_in_bits +15;/* 18-3 */
|
||
/*
|
||
* Bit 4 Optional Custom PCF, "0" CIF PCF, "1" custom PCF;
|
||
* Bit 5 Optional Unrestricted Motion Vector (UMV) mode (see Annex D), "0" off, "1" on;
|
||
* Bit 6 Optional Syntax-based Arithmetic Coding (SAC) mode (see Annex E), "0" off, "1" on;
|
||
* Bit 7 Optional Advanced Prediction (AP) mode (see Annex F), "0" off, "1" on;
|
||
* Bit 8 Optional Advanced INTRA Coding (AIC) mode (see Annex I), "0" off, "1" on;
|
||
* Bit 9 Optional Deblocking Filter (DF) mode (see Annex J), "0" off, "1" on;
|
||
* Bit 10 Optional Slice Structured (SS) mode (see Annex K), "0" off, "1" on;
|
||
* Bit 11 Optional Reference Picture Selection (RPS) mode (see Annex N), "0" off, "1" on;
|
||
* Bit 12 Optional Independent Segment Decoding (ISD) mode (see Annex R), "0" off,"1" on;
|
||
* Bit 13 Optional Alternative INTER VLC (AIV) mode (see Annex S), "0" off, "1" on;
|
||
* Bit 14 Optional Modified Quantization (MQ) mode (see Annex T), "0" off, "1" on;
|
||
* Bit 15 Equal to "1" to prevent start code emulation;
|
||
* Bit 16 Reserved, shall be equal to "0";
|
||
* Bit 17 Reserved, shall be equal to "0";
|
||
* Bit 18 Reserved, shall be equal to "0".
|
||
*/
|
||
}
|
||
/*
|
||
* 5.1.4.3 The mandatory part of PLUSPTYPE when PLUSPTYPE present (MPPTYPE) (9 bits)
|
||
* Regardless of the value of UFEP, the following 9 bits are also present in PLUSPTYPE:
|
||
* – Bits 1-3 Picture Type Code:
|
||
* "000" I-picture (INTRA);
|
||
* "001" P-picture (INTER);
|
||
* "010" Improved PB-frame (see Annex M);
|
||
* "011" B-picture (see Annex O);
|
||
* "100" EI-picture (see Annex O);
|
||
* "101" EP-picture (see Annex O);
|
||
* "110" Reserved;
|
||
* "111" Reserved;
|
||
* – Bit 4 Optional Reference Picture Resampling (RPR) mode (see Annex P), "0" off, "1" on;
|
||
* – Bit 5 Optional Reduced-Resolution Update (RRU) mode (see Annex Q), "0" off, "1" on;
|
||
* – Bit 6 Rounding Type (RTYPE) (see 6.1.2);
|
||
* – Bit 7 Reserved, shall be equal to "0";
|
||
* – Bit 8 Reserved, shall be equal to "0";
|
||
* – Bit 9 Equal to "1" to prevent start code emulation.
|
||
*/
|
||
offset_in_bits = offset_in_bits +9;
|
||
}
|
||
|
||
return offset_in_bits>>3;
|
||
|
||
}
|
||
|
||
/* RFC 4629 */
|
||
static void
|
||
dissect_h263P( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
|
||
{
|
||
proto_item *ti = NULL;
|
||
proto_item *data_item = NULL;
|
||
proto_item *extra_hdr_item = NULL;
|
||
proto_tree *h263P_tree = NULL;
|
||
proto_tree *h263P_extr_hdr_tree = NULL;
|
||
proto_tree *h263P_data_tree = NULL;
|
||
unsigned int offset = 0;
|
||
unsigned int start_offset = 0;
|
||
guint16 data16, plen;
|
||
guint8 octet;
|
||
|
||
/*
|
||
tvbuff_t *next_tvb;
|
||
*/
|
||
|
||
if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) {
|
||
col_set_str( pinfo->cinfo, COL_PROTOCOL, "H.263 RFC4629 " );
|
||
}
|
||
|
||
if ( tree ) {
|
||
ti = proto_tree_add_item( tree, proto_h263P, tvb, offset, -1, FALSE );
|
||
h263P_tree = proto_item_add_subtree( ti, ett_h263P );
|
||
/* Add it as hidden to make a filter of h263 possible here as well */
|
||
proto_tree_add_item_hidden( tree, proto_h263, tvb, offset, -1, FALSE );
|
||
|
||
data16 = tvb_get_ntohs(tvb,offset);
|
||
proto_tree_add_item( h263P_tree, hf_h263P_rr, tvb, offset, 2, FALSE );
|
||
proto_tree_add_item( h263P_tree, hf_h263P_pbit, tvb, offset, 2, FALSE );
|
||
proto_tree_add_item( h263P_tree, hf_h263P_vbit, tvb, offset, 2, FALSE );
|
||
proto_tree_add_item( h263P_tree, hf_h263P_plen, tvb, offset, 2, FALSE );
|
||
proto_tree_add_item( h263P_tree, hf_h263P_pebit, tvb, offset, 2, FALSE );
|
||
offset = offset +2;
|
||
/*
|
||
* V: 1 bit
|
||
*
|
||
* Indicates the presence of an 8-bit field containing information
|
||
* for Video Redundancy Coding (VRC), which follows immediately after
|
||
* the initial 16 bits of the payload header, if present. For syntax
|
||
* and semantics of that 8-bit VRC field, see Section 5.2.
|
||
*/
|
||
|
||
if ((data16&0x0200)==0x0200){
|
||
/* V bit = 1
|
||
* The format of the VRC header extension is as follows:
|
||
*
|
||
* 0 1 2 3 4 5 6 7
|
||
* +-+-+-+-+-+-+-+-+
|
||
* | TID | Trun |S|
|
||
* +-+-+-+-+-+-+-+-+
|
||
*
|
||
* TID: 3 bits
|
||
*
|
||
* Thread ID. Up to 7 threads are allowed. Each frame of H.263+ VRC
|
||
* data will use as reference information only sync frames or frames
|
||
* within the same thread. By convention, thread 0 is expected to be
|
||
* the "canonical" thread, which is the thread from which the sync frame
|
||
* should ideally be used. In the case of corruption or loss of the
|
||
* thread 0 representation, a representation of the sync frame with a
|
||
* higher thread number can be used by the decoder. Lower thread
|
||
* numbers are expected to contain representations of the sync frames
|
||
* equal to or better than higher thread numbers in the absence of data
|
||
* corruption or loss. See [Vredun] for a detailed discussion of VRC.
|
||
*
|
||
* Trun: 4 bits
|
||
*
|
||
* Monotonically increasing (modulo 16) 4-bit number counting the packet
|
||
* number within each thread.
|
||
*
|
||
* S: 1 bit
|
||
*
|
||
* A bit that indicates that the packet content is for a sync frame.
|
||
* :
|
||
*/
|
||
proto_tree_add_item( h263P_tree, hf_h263P_tid, tvb, offset, 1, FALSE );
|
||
proto_tree_add_item( h263P_tree, hf_h263P_trun, tvb, offset, 1, FALSE );
|
||
proto_tree_add_item( h263P_tree, hf_h263P_s, tvb, offset, 1, FALSE );
|
||
offset++;
|
||
}
|
||
|
||
/* Length, in bytes, of the extra picture header. */
|
||
plen = (data16 & 0x01f8) >> 3;
|
||
if (plen != 0){
|
||
start_offset = offset;
|
||
extra_hdr_item = proto_tree_add_item( h263P_tree, hf_h263P_extra_hdr, tvb, offset, plen, FALSE );
|
||
h263P_extr_hdr_tree = proto_item_add_subtree( extra_hdr_item, ett_h263P_extra_hdr );
|
||
|
||
dissect_h263_picture_layer( tvb, h263P_extr_hdr_tree, offset, plen, TRUE);
|
||
|
||
offset = start_offset + plen;
|
||
}
|
||
if ((data16&0x0400)!=0){
|
||
/* P bit = 1 */
|
||
data_item = proto_tree_add_item( h263P_tree, hf_h263P_payload, tvb, offset, -1, FALSE );
|
||
h263P_data_tree = proto_item_add_subtree( data_item, ett_h263P_data );
|
||
octet = tvb_get_guint8(tvb,offset);
|
||
if((octet&0xfc)==0x80){
|
||
/* Check for PSC, PSC is a word of 22 bits. Its value is 0000 0000 0000 0000' 1000 00xx xxxx xxxx.
|
||
* Here without the first two 0 bytes of the PSC
|
||
*/
|
||
if ( check_col( pinfo->cinfo, COL_INFO) )
|
||
col_append_str( pinfo->cinfo, COL_INFO, "(PSC) ");
|
||
|
||
offset = dissect_h263_picture_layer( tvb, h263P_data_tree, offset, -1, TRUE);
|
||
return;
|
||
}else{
|
||
/*
|
||
if ( check_col( pinfo->cinfo, COL_INFO) )
|
||
col_append_str( pinfo->cinfo, COL_INFO, "(GBSC) ");
|
||
*/
|
||
return;
|
||
}
|
||
}
|
||
proto_tree_add_item( h263P_tree, hf_h263P_payload, tvb, offset, -1, FALSE );
|
||
}
|
||
}
|
||
/*
|
||
TODO: Add these?
|
||
End Of Sequence (EOS) (22 bits)
|
||
A codeword of 22 bits. Its value is 0000 0000 0000 0000 1 11111.
|
||
|
||
Group of Block Start Code (GBSC) (17 bits)
|
||
A word of 17 bits. Its value is 0000 0000 0000 0000 1.
|
||
|
||
End Of Sub-Bitstream code (EOSBS) (23 bits)
|
||
The EOSBS code is a codeword of 23 bits. Its value is 0000 0000 0000 0000 1 11110 0.
|
||
|
||
Slice Start Code (SSC) (17 bits)
|
||
A word of 17 bits. Its value is 0000 0000 0000 0000 1.
|
||
*/
|
||
static void dissect_h263_data( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
|
||
{
|
||
guint offset = 0;
|
||
proto_item *h263_payload_item = NULL;
|
||
proto_tree *h263_payload_tree = NULL;
|
||
guint32 data;
|
||
|
||
if ( check_col( pinfo->cinfo, COL_INFO) ) {
|
||
col_append_str( pinfo->cinfo, COL_INFO, "H263 payload ");
|
||
}
|
||
|
||
if( tree ) {
|
||
h263_payload_item = proto_tree_add_item( tree, hf_h263_payload, tvb, offset, -1, FALSE );
|
||
h263_payload_tree = proto_item_add_subtree( h263_payload_item, ett_h263_payload );
|
||
}
|
||
|
||
/* Check for PSC, PSC is a word of 22 bits. Its value is 0000 0000 0000 0000' 1000 00xx xxxx xxxx. */
|
||
data = tvb_get_ntohl(tvb, offset);
|
||
|
||
if (( data & 0xffff8000) == 0x00008000 ) { /* PSC or Group of Block Start Code (GBSC) found */
|
||
if (( data & 0x00007c00) == 0 ) { /* PSC found */
|
||
if ( check_col( pinfo->cinfo, COL_INFO) )
|
||
col_append_str( pinfo->cinfo, COL_INFO, "(PSC) ");
|
||
if( tree ) {
|
||
offset = dissect_h263_picture_layer( tvb, h263_payload_tree, offset, -1, FALSE);
|
||
}
|
||
} else { /* GBSC found */
|
||
if ( check_col( pinfo->cinfo, COL_INFO) )
|
||
col_append_str( pinfo->cinfo, COL_INFO, "(GBSC) ");
|
||
if( tree ) {
|
||
/* Group of Block Start Code (GBSC) (17 bits)
|
||
* A word of 17 bits. Its value is 0000 0000 0000 0000 1. GOB start codes may be byte aligned. This
|
||
* can be achieved by inserting GSTUF before the start code such that the first bit of the start code is
|
||
* the first (most significant) bit of a byte.
|
||
*
|
||
*/
|
||
proto_tree_add_uint(h263_payload_tree, hf_h263_gbsc,tvb, offset,3,data);
|
||
proto_tree_add_uint(h263_payload_tree, hf_h263_GN, tvb, offset,3,data);
|
||
/* GN is followed by (optionally) GBSI, then
|
||
* GFID and GQUANT, but decoding them requires
|
||
* knowing the value of CPM in the picture
|
||
* header */
|
||
offset = offset + 2;
|
||
}
|
||
}
|
||
}
|
||
if( tree )
|
||
proto_tree_add_item( h263_payload_tree, hf_h263_data, tvb, offset, -1, FALSE );
|
||
}
|
||
|
||
void
|
||
proto_register_h263(void)
|
||
{
|
||
static hf_register_info hf[] =
|
||
{
|
||
{
|
||
&hf_h263_ftype,
|
||
{
|
||
"F",
|
||
"h263.ftype",
|
||
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_payload,
|
||
{
|
||
"H.263 payload",
|
||
"h263.payload",
|
||
FT_NONE,
|
||
BASE_NONE,
|
||
NULL,
|
||
0x0,
|
||
"The actual H.263 data", 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
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_psc,
|
||
{
|
||
"H.263 Picture start Code",
|
||
"h263.psc",
|
||
FT_UINT32,
|
||
BASE_HEX,
|
||
NULL,
|
||
0xfffffc00,
|
||
"Picture start Code, PSC", HFILL
|
||
}
|
||
},
|
||
{ &hf_h263_gbsc,
|
||
{
|
||
"H.263 Group of Block Start Code",
|
||
"h263.gbsc",
|
||
FT_UINT32,
|
||
BASE_HEX,
|
||
NULL,
|
||
0xffff8000,
|
||
"Group of Block Start Code", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_TR,
|
||
{
|
||
"H.263 Temporal Reference",
|
||
"h263.tr2",
|
||
FT_UINT32,
|
||
BASE_HEX,
|
||
NULL,
|
||
0x000003fc,
|
||
"Temporal Reference, TR", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_split_screen_indicator,
|
||
{
|
||
"H.263 Split screen indicator",
|
||
"h263.split_screen_indicator",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&on_off_flg),
|
||
0x80,
|
||
"Split screen indicator", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_document_camera_indicator,
|
||
{
|
||
"H.263 Document camera indicator",
|
||
"h263.document_camera_indicator",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&on_off_flg),
|
||
0x40,
|
||
"Document camera indicator", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_full_picture_freeze_release,
|
||
{
|
||
"H.263 Full Picture Freeze Release",
|
||
"h263.split_screen_indicator",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&on_off_flg),
|
||
0x20,
|
||
"Full Picture Freeze Release", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_source_format,
|
||
{
|
||
"H.263 Source Format",
|
||
"h263.split_screen_indicator",
|
||
FT_UINT8,
|
||
BASE_HEX,
|
||
VALS(srcformat_vals),
|
||
0x1c,
|
||
"Source Format", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_UFEP,
|
||
{
|
||
"H.263 Update Full Extended PTYPE",
|
||
"h263.ufep",
|
||
FT_UINT16,
|
||
BASE_DEC,
|
||
VALS(h263_ufep_vals),
|
||
0x0380,
|
||
"Update Full Extended PTYPE", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_opptype,
|
||
{
|
||
"H.263 Optional Part of PLUSPTYPE",
|
||
"h263.opptype",
|
||
FT_UINT24,
|
||
BASE_DEC,
|
||
NULL,
|
||
0x7fffe0,
|
||
"Optional Part of PLUSPTYPE", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_payload_picture_coding_type,
|
||
{
|
||
"H.263 Picture Coding Type",
|
||
"h263.picture_coding_type",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&picture_coding_type_flg),
|
||
0x02,
|
||
"Picture Coding Typet", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_opt_unres_motion_vector_mode,
|
||
{
|
||
"H.263 Optional Unrestricted Motion Vector mode",
|
||
"h263.opt_unres_motion_vector_mode",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&on_off_flg),
|
||
0x01,
|
||
"Optional Unrestricted Motion Vector mode", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_syntax_based_arithmetic_coding_mode,
|
||
{
|
||
"H.263 Optional Syntax-based Arithmetic Coding mode",
|
||
"h263.syntax_based_arithmetic_coding_mode",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&on_off_flg),
|
||
0x80,
|
||
"Optional Syntax-based Arithmetic Coding mode", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_optional_advanced_prediction_mode,
|
||
{
|
||
"H.263 Optional Advanced Prediction mode",
|
||
"h263.optional_advanced_prediction_mode",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&on_off_flg),
|
||
0x40,
|
||
"Optional Advanced Prediction mode", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_PB_frames_mode,
|
||
{
|
||
"H.263 Optional PB-frames mode",
|
||
"h263.PB_frames_mode",
|
||
FT_BOOLEAN,
|
||
8,
|
||
TFS(&PB_frames_mode_flg),
|
||
0x20,
|
||
"Optional PB-frames mode", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263_GN,
|
||
{
|
||
"H.263 Group Number",
|
||
"h263.gn",
|
||
FT_UINT32,
|
||
BASE_DEC,
|
||
NULL,
|
||
0x00007c00,
|
||
"Group Number, GN", HFILL
|
||
}
|
||
},
|
||
};
|
||
|
||
static gint *ett[] =
|
||
{
|
||
&ett_h263,
|
||
&ett_h263_payload,
|
||
&ett_h263_optype,
|
||
};
|
||
|
||
|
||
proto_h263 = proto_register_protocol("ITU-T Recommendation H.263 RTP Payload header (RFC2190)",
|
||
"H.263", "h263");
|
||
proto_h263_data = proto_register_protocol("ITU-T Recommendation H.263",
|
||
"H.263 data", "h263data");
|
||
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);
|
||
register_dissector("h263data", dissect_h263_data, proto_h263_data);
|
||
}
|
||
|
||
void
|
||
proto_register_h263P(void)
|
||
{
|
||
static hf_register_info hf[] =
|
||
{
|
||
{
|
||
&hf_h263P_payload,
|
||
{
|
||
"H.263 RFC4629 payload",
|
||
"h263P.payload",
|
||
FT_NONE,
|
||
BASE_NONE,
|
||
NULL,
|
||
0x0,
|
||
"The actual H.263 RFC4629 data", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_rr,
|
||
{
|
||
"Reserved",
|
||
"h263P.rr",
|
||
FT_UINT16,
|
||
BASE_DEC,
|
||
NULL,
|
||
0xf800,
|
||
"Reserved SHALL be zero", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_pbit,
|
||
{
|
||
"P",
|
||
"h263P.p",
|
||
FT_BOOLEAN,
|
||
16,
|
||
NULL,
|
||
0x0400,
|
||
"Indicates (GOB/Slice) start or (EOS or EOSBS)", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_vbit,
|
||
{
|
||
"V",
|
||
"h263P.v",
|
||
FT_BOOLEAN,
|
||
16,
|
||
NULL,
|
||
0x0200,
|
||
"presence of Video Redundancy Coding (VRC) field", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_plen,
|
||
{
|
||
"PLEN",
|
||
"h263P.plen",
|
||
FT_UINT16,
|
||
BASE_DEC,
|
||
NULL,
|
||
0x01f8,
|
||
"Length, in bytes, of the extra picture header", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_pebit,
|
||
{
|
||
"PEBIT",
|
||
"h263P.pebit",
|
||
FT_UINT16,
|
||
BASE_DEC,
|
||
NULL,
|
||
0x0003,
|
||
"number of bits that shall be ignored in the last byte of the picture header", HFILL
|
||
}
|
||
},
|
||
|
||
|
||
{
|
||
&hf_h263P_tid,
|
||
{
|
||
"Thread ID",
|
||
"h263P.tid",
|
||
FT_UINT8,
|
||
BASE_DEC,
|
||
NULL,
|
||
0xe0,
|
||
"Thread ID", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_trun,
|
||
{
|
||
"Trun",
|
||
"h263P.trun",
|
||
FT_UINT8,
|
||
BASE_DEC,
|
||
NULL,
|
||
0x1e,
|
||
"Monotonically increasing (modulo 16) 4-bit number counting the packet number within each thread", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_s,
|
||
{
|
||
"S",
|
||
"h263P.s",
|
||
FT_UINT8,
|
||
BASE_DEC,
|
||
NULL,
|
||
0x01,
|
||
"Indicates that the packet content is for a sync frame", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_extra_hdr,
|
||
{
|
||
"Extra picture header",
|
||
"h263P.extra_hdr",
|
||
FT_BYTES,
|
||
BASE_NONE,
|
||
NULL,
|
||
0x0,
|
||
"Extra picture header", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_PSC,
|
||
{
|
||
"H.263 PSC",
|
||
"h263P.PSC",
|
||
FT_UINT16,
|
||
BASE_HEX,
|
||
NULL,
|
||
0xfc00,
|
||
"Picture Start Code(PSC)", HFILL
|
||
}
|
||
},
|
||
{
|
||
&hf_h263P_TR,
|
||
{
|
||
"H.263 Temporal Reference",
|
||
"h263P.tr",
|
||
FT_UINT16,
|
||
BASE_HEX,
|
||
NULL,
|
||
0x03fc,
|
||
"Temporal Reference, TR", HFILL
|
||
}
|
||
},
|
||
|
||
};
|
||
|
||
static gint *ett[] =
|
||
{
|
||
&ett_h263P,
|
||
&ett_h263P_extra_hdr,
|
||
&ett_h263P_payload,
|
||
&ett_h263P_data,
|
||
};
|
||
|
||
|
||
proto_h263P = proto_register_protocol("ITU-T Recommendation H.263 RTP Payload header (RFC4629)",
|
||
"H263P", "h263p");
|
||
|
||
proto_register_field_array(proto_h263P, hf, array_length(hf));
|
||
proto_register_subtree_array(ett, array_length(ett));
|
||
|
||
register_dissector("h263P", dissect_h263P, proto_h263P);
|
||
|
||
}
|
||
|
||
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);
|
||
}
|
||
|
||
void
|
||
proto_reg_handoff_h263P(void)
|
||
{
|
||
dissector_handle_t h263P_handle;
|
||
|
||
h263P_handle = find_dissector("h263P");
|
||
dissector_add_string("rtp_dyn_payload_type","H263-1998", h263P_handle);
|
||
dissector_add_string("rtp_dyn_payload_type","H263-2000", h263P_handle);
|
||
}
|