/* packet-mpeg1.c * * Routines for RFC 2250 MPEG-1 dissection * * $Id: packet-mpeg1.c,v 1.7 2002/02/01 04:34:15 gram Exp $ * * Copyright 2001, * Francisco Javier Cabello Torres, * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* * This dissector tries to dissect the MPEG-1 video streams. * * This dissector is called by the RTP dissector */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #ifdef HAVE_SYS_TYPES_H # include #endif #ifdef HAVE_NETINET_IN_H # include #endif #include #include #define RTP_MPG_MBZ(word) ( word >> 11) #define RTP_MPG_T(word) ( (word >> 10) & 1 ) #define RTP_MPG_TR(word) ( word & 0x3ff ) #define RTP_MPG_AN(octet) ( octet >> 7) #define RTP_MPG_N(octet) ( (octet >> 6) & 1 ) #define RTP_MPG_S(octet) ( (octet >> 5) & 1 ) #define RTP_MPG_B(octet) ( (octet >> 4) & 1 ) #define RTP_MPG_E(octet) ( (octet >> 3) & 1 ) #define RTP_MPG_P(octet) ( octet & 7 ) #define RTP_MPG_FBV(octet) ( (octet >> 7) & 1 ) #define RTP_MPG_BFC(octet) ( (octet >> 4) & 7 ) #define RTP_MPG_FFV(octet) ( (octet >> 3) & 1 ) #define RTP_MPG_FFC(octet) ( octet & 7 ) /* MPEG1 header fields */ static int proto_mpg = -1; static int hf_rtp_mpg_mbz = -1; static int hf_rtp_mpg_T = -1; static int hf_rtp_mpg_tr = -1; static int hf_rtp_mpg_an = -1; static int hf_rtp_mpg_n = -1; static int hf_rtp_mpg_s = -1; static int hf_rtp_mpg_b = -1; static int hf_rtp_mpg_e = -1; static int hf_rtp_mpg_p = -1; static int hf_rtp_mpg_fbv = -1; static int hf_rtp_mpg_bfc = -1; static int hf_rtp_mpg_ffv = -1; static int hf_rtp_mpg_ffc = -1; static int hf_rtp_mpg_data = -1; /* MPEG-1 fields defining a sub tree */ static gint ett_mpg = -1; static const value_string rtp_mpg_picture_types_vals[] = { { 0, "Forbidden" }, { 1, "I-Picture" }, { 2, "P-Picture" }, { 3, "B-Picture" }, { 4, "D-Picture" }, { 5, "reserved" }, { 6, "reserved" }, { 7, "reserved" }, { 0, NULL }, }; static void dissect_mpeg1( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) { proto_item *ti = NULL; proto_tree *mpg_tree = NULL; unsigned int offset = 0; guint8 octet; guint16 word; guint16 mpg_mbz; guint16 mpg_T; guint16 mpg_tr; guint16 mpg_an; guint16 mpg_n; gboolean mpg_s; gboolean mpg_b; gboolean mpg_e; guint16 mpg_p; guint16 mpg_fbv; guint16 mpg_bfc; guint16 mpg_ffv; guint16 mpg_ffc; if ( check_col( pinfo->cinfo, COL_PROTOCOL ) ) { col_set_str( pinfo->cinfo, COL_PROTOCOL, "MPEG-1" ); } if ( check_col( pinfo->cinfo, COL_INFO) ) { col_set_str( pinfo->cinfo, COL_INFO, "MPEG-1 message"); } /* Get MPEG-1 fields */ word = tvb_get_guint8( tvb, offset ); word = (word << 8) | tvb_get_guint8( tvb, offset +1 ); mpg_mbz = RTP_MPG_MBZ(word); mpg_T = RTP_MPG_T(word); mpg_tr = RTP_MPG_TR(word); octet = tvb_get_guint8( tvb, offset + 2 ); mpg_an = RTP_MPG_AN(octet); mpg_n = RTP_MPG_N(octet); mpg_s = RTP_MPG_S(octet); mpg_b = RTP_MPG_B(octet); mpg_e = RTP_MPG_E(octet); mpg_p = RTP_MPG_P(octet); octet = tvb_get_guint8( tvb, offset + 3 ); mpg_fbv = RTP_MPG_FBV(octet); mpg_bfc = RTP_MPG_BFC(octet); mpg_ffv = RTP_MPG_FFV(octet); mpg_ffc = RTP_MPG_FFC(octet); if ( tree ) { ti = proto_tree_add_item( tree, proto_mpg, tvb, offset, -1, FALSE ); mpg_tree = proto_item_add_subtree( ti, ett_mpg ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_mbz, tvb, offset, 1, mpg_mbz ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_T , tvb, offset, 1, mpg_T ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_tr , tvb, offset, 2, mpg_tr ); offset += 2; proto_tree_add_uint( mpg_tree, hf_rtp_mpg_an, tvb, offset, 1, mpg_an ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_n , tvb, offset, 1, mpg_n ); proto_tree_add_boolean( mpg_tree, hf_rtp_mpg_s , tvb, offset, 1, mpg_s ); proto_tree_add_boolean( mpg_tree, hf_rtp_mpg_b , tvb, offset, 1, mpg_b ); proto_tree_add_boolean( mpg_tree, hf_rtp_mpg_e , tvb, offset, 1, mpg_e ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_p, tvb , offset, 1, mpg_p ); offset += 1; proto_tree_add_uint( mpg_tree, hf_rtp_mpg_fbv, tvb, offset, 1, mpg_fbv ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_bfc, tvb, offset, 1, mpg_bfc ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_ffv, tvb, offset, 1, mpg_ffv ); proto_tree_add_uint( mpg_tree, hf_rtp_mpg_ffc, tvb, offset, 1, mpg_ffc ); offset += 1; /* The rest of the packet is the MPEG-1 stream */ proto_tree_add_item( mpg_tree, hf_rtp_mpg_data, tvb, offset, -1, FALSE ); } } void proto_register_mpeg1(void) { static hf_register_info hf[] = { { &hf_rtp_mpg_mbz, { "MBZ", "rtp.payload_mpeg_mbz", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_T, { "T", "rtp.payload_mpeg_T", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_tr, { "Temporal Reference", "rtp.payload_mpeg_tr", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_an, { "AN", "rtp.payload_mpeg_an", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_n, { "New Picture Header", "rtp.payload_mpeg_n", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_s, { "Sequence Header", "rtp.payload_mpeg_s", FT_BOOLEAN, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_b, { "Beginning-of-slice", "rtp.payload_mpeg_b", FT_BOOLEAN, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_e, { "End-of-slice", "rtp.payload_mpeg_an", FT_BOOLEAN, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_p, { "Picture type", "rtp.payload_mpeg_p", FT_UINT16, BASE_DEC, VALS(rtp_mpg_picture_types_vals), 0x0, "", HFILL } }, { &hf_rtp_mpg_fbv, { "FBV", "rtp.payload_mpeg_fbv", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_bfc, { "BFC", "rtp.payload_mpeg_bfc", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_ffv, { "FFV", "rtp.payload_mpeg_ffv", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_ffc, { "FFC", "rtp.payload_mpeg_ffc", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL } }, { &hf_rtp_mpg_data, { "MPEG-1 stream", "mpeg1.stream", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL } }, }; static gint *ett[] = { &ett_mpg, }; proto_mpg = proto_register_protocol("RFC 2250 MPEG1","MPEG1","mpeg1"); proto_register_field_array(proto_mpg, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); register_dissector("mpeg1", dissect_mpeg1, proto_mpg); }