/* * packet-mp4ves.c * Routines for MPEG4 dissection * Copyright 2007-2008, Anders Broman * * $Id$ * * Wireshark - 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. * * References: * http://www.ietf.org/rfc/rfc3016.txt?number=3016 */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include #include #include "prefs.h" /* Initialize the protocol and registered fields */ static int proto_mp4ves = -1; static int hf_mp4ves_config = -1; static int hf_mp4ves_start_code_prefix = -1; static int hf_mp4ves_start_code = -1; static int hf_mp4ves_vop_coding_type = -1; /* Initialize the subtree pointers */ static int ett_mp4ves = -1; static int ett_mp4ves_config = -1; /* The dynamic payload type which will be dissected as MP4V-ES */ static guint global_dynamic_payload_type = 0; /* 14496-2, Annex G, Table G-1. Table G-1 FLC table for profile_and_level_indication Profile/Level Code */ static const value_string mp4ves_level_indication_vals[] = { { 0, "Reserved" }, { 1, "Simple Profile/Level 1" }, { 2, "Simple Profile/Level 2" }, { 3, "Reserved" }, { 4, "Reserved" }, { 5, "Reserved" }, { 6, "Reserved" }, { 7, "Reserved" }, { 8, "Simple Profile/Level 0" }, { 9, "Simple Profile/Level 0b" }, /* Reserved 00001001 - 00010000 */ { 0x11, "Simple Scalable Profile/Level 1" }, { 0x12, "Simple Scalable Profile/Level 2" }, /* Reserved 00010011 - 00100000 */ { 0x21, "Core Profile/Level 1" }, { 0x22, "Core Profile/Level 2" }, /* Reserved 00100011 - 00110001 */ { 0x32, "Main Profile/Level 2" }, { 0x33, "Main Profile/Level 3" }, { 0x34, "Main Profile/Level 4" }, /* Reserved 00110101 - 01000001 */ { 0x42, "N-bit Profile/Level 2" }, /* Reserved 01000011 - 01010000 */ { 0x51, "Scalable Texture Profile/Level 1" }, /* Reserved 01010010 - 01100000 */ { 0x61, "Simple Face Animation Profile/Level 1" }, { 0x62, "Simple Face Animation Profile/Level 2" }, { 0x63, "Simple FBA Profile/Level 1" }, { 0x64, "Simple FBA Profile/Level 2" }, /* Reserved 01100101 - 01110000 */ { 0x71, "Basic Animated Texture Profile/Level 1" }, { 0x72, "Basic Animated Texture Profile/Level 2" }, /* Reserved 01110011 - 10000000 */ { 0x81, "Hybrid Profile/Level 1" }, { 0x82, "Hybrid Profile/Level 2" }, /* Reserved 10000011 - 10010000 */ { 0x91, "Advanced Real Time Simple Profile/Level 1" }, { 0x92, "Advanced Real Time Simple Profile/Level 2" }, { 0x93, "Advanced Real Time Simple Profile/Level 3" }, { 0x94, "Advanced Real Time Simple Profile/Level 4" }, /* Reserved 10010101 - 10100000 */ { 0xa1, "Core Scalable Profile/Level 1" }, { 0xa2, "Core Scalable Profile/Level 2" }, { 0xa3, "Core Scalable Profile/Level 3" }, /* Reserved 10100100 - 10110000 */ { 0xb1, "Advanced Coding Efficiency Profile/Level 1" }, { 0xb2, "Advanced Coding Efficiency Profile/Level 2" }, { 0xb3, "Advanced Coding Efficiency Profile/Level 3" }, { 0xb4, "Advanced Coding Efficiency Profile/Level 4" }, /* Reserved 10110101 - 11000000 */ { 0xc1, "Advanced Core Profile/Level 1" }, { 0xc2, "Advanced Core Profile/Level 2" }, /* Reserved 11000011 - 11010000 */ { 0xd1, "Advanced Scalable Texture/Level 1" }, { 0xd2, "Advanced Scalable Texture/Level 2" }, { 0xd3, "Advanced Scalable Texture/Level 3" }, /* Reserved 11010100 - 11100000 */ { 0xe1, "Simple Studio Profile/Level 1" }, { 0xe2, "Simple Studio Profile/Level 2" }, { 0xe3, "Simple Studio Profile/Level 3" }, { 0xe4, "Simple Studio Profile/Level 4" }, { 0xe5, "Core Studio Profile/Level 1" }, { 0xe6, "Core Studio Profile/Level 2" }, { 0xe7, "Core Studio Profile/Level 3" }, { 0xe8, "Core Studio Profile/Level 4" }, /* Reserved 11101001 - 11101111 */ { 0xf0, "Advanced Simple Profile/Level 0" }, { 0xf1, "Advanced Simple Profile/Level 1" }, { 0xf2, "Advanced Simple Profile/Level 2" }, { 0xf3, "Advanced Simple Profile/Level 3" }, { 0xf4, "Advanced Simple Profile/Level 4" }, { 0xf5, "Advanced Simple Profile/Level 5" }, /* Reserved 11110110 - 11110111 */ { 0xf8, "Fine Granularity Scalable Profile/Level 0" }, { 0xf9, "Fine Granularity Scalable Profile/Level 1" }, { 0xfa, "Fine Granularity Scalable Profile/Level 2" }, { 0xfb, "Fine Granularity Scalable Profile/Level 3" }, { 0xfc, "Fine Granularity Scalable Profile/Level 4" }, { 0xfd, "Fine Granularity Scalable Profile/Level 5" }, { 0xfe, "Reserved" }, { 0xff, "Reserved for Escape" }, { 0, NULL }, }; static const range_string mp4ves_startcode_vals[] = { { 0, 0x1f, "video_object_start_code" }, { 0x20, 0x2f, "video_object_layer_start_code" }, { 0x30, 0xaf, "reserved" }, { 0xb0, 0xb0, "visual_object_sequence_start_code" }, { 0xb1, 0xb1, "visual_object_sequence_end_code" }, { 0xb2, 0xb2, "user_data_start_code" }, { 0xb3, 0xb3, "group_of_vop_start_code" }, { 0xb4, 0xb4, "video_session_error_code" }, { 0xb5, 0xb5, "visual_object_start_code" }, { 0xb6, 0xb6, "vop_start_code" }, { 0xb7, 0xb9, "reserved" }, { 0xba, 0xba, "fba_object_start_code" }, { 0xbb, 0xbb, "fba_object_plane_start_code" }, { 0xbc, 0xbc, "mesh_object_start_code" }, { 0xbd, 0xbd, "mesh_object_plane_start_code" }, { 0xbe, 0xbe, "still_texture_object_start_code" }, { 0xbf, 0xbf, "texture_spatial_layer_start_code" }, { 0xc0, 0xc0, "texture_snr_layer_start_code" }, { 0xc1, 0xc1, "texture_tile_start_code" }, { 0xc2, 0xc2, "texture_shape_layer_start_code" }, { 0xc3, 0xc3, "stuffing_start_code" }, { 0xc4, 0xc5, "reserved" }, { 0xc6, 0xcf, "System start codes" }, /* NOTE System start codes are defined in ISO/IEC 14496-1:1999 */ { 0, 0, NULL } }; static const value_string mp4ves_vop_coding_type_vals[] = { { 0, "intra-coded (I)" }, { 1, "predictive-coded (P)" }, { 2, "bidirectionally-predictive-coded (B)" }, { 3, "sprite (S)" }, { 0, NULL } }; /* * FLC table for video_object_type indication */ static const value_string mp4ves_video_object_type_vals[] = { { 0x0, "Reserved" }, { 0x1, "Simple Object Type" }, { 0x2, "Simple Scalable Object Type" }, { 0x3, "Core Object Type" }, { 0x4, "Main Object Type" }, { 0x5, "N-bit Object Type" }, { 0x6, "Basic Anim. 2D Texture" }, { 0x7, "Anim. 2D Mesh" }, { 0x8, "Simple Face" }, { 0x9, "Still Scalable Texture" }, { 0xa, "Advanced Real Time Simple" }, { 0xb, "Core Scalable" }, { 0xc, "Advanced Coding Efficiency" }, { 0xd, "Advanced Scalable Texture" }, { 0xe, "Simple FBA" }, { 0, NULL } }; #if 0 To be called from packet-sdp.c void dissect_mp4ves_config(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_item *item; proto_tree *mp4ves_tree; int bit_offset = 0; guint32 dword; item = proto_tree_add_item(tree, hf_mp4ves_config, tvb, 0, -1, FALSE); mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves_config); /* Get start code prefix */ dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE); if (dword == 1){ }else{ /* No start code prefix */ return; } proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE); bit_offset = bit_offset+24; /* We are byte aligned no stuffing */ dword = tvb_get_bits8(tvb,bit_offset, 8); proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE); } #endif void dissect_mp4ves(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { int bit_offset = 0; proto_item *item; proto_tree *mp4ves_tree; guint32 dword; /* Make entries in Protocol column and Info column on summary display */ if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "MP4V-ES"); if (tree) { item = proto_tree_add_item(tree, proto_mp4ves, tvb, 0, -1, FALSE); mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves); /* +------+------+------+------+ (a) | RTP | VS | VO | VOL | |header|header|header|header| +------+------+------+------+ +------+------+------+------+------------+ (b) | RTP | VS | VO | VOL |Video Packet| |header|header|header|header| | +------+------+------+------+------------+ +------+-----+------------------+ (c) | RTP | GOV |Video Object Plane| |header| | | +------+-----+------------------+ +------+------+------------+ +------+------+------------+ (d) | RTP | VOP |Video Packet| | RTP | VP |Video Packet| |header|header| (1) | |header|header| (2) | +------+------+------------+ +------+------+------------+ +------+------+------------+------+------------+------+------------+ (e) | RTP | VP |Video Packet| VP |Video Packet| VP |Video Packet| |header|header| (1) |header| (2) |header| (3) | +------+------+------------+------+------------+------+------------+ +------+------+------------+ +------+------------+ (f) | RTP | VOP |VOP fragment| | RTP |VOP fragment| |header|header| (1) | |header| (2) | ___ +------+------+------------+ +------+------------+ Figure 2 - Examples of RTP packetized MPEG-4 Visual bitstream So a valid packet should start with VS - Visual Object Sequence Header GOV - Group_of_VideoObjectPlane VOP - Video Object Plane VP - Video Plane Otherwies it's a VOP fragment. visual_object_sequence_start_code: The visual_object_sequence_start_code is the bit string '000001B0' in hexadecimal. It initiates a visual session. group_of_vop_start_code: The group_of_vop_start_code is the bit string '000001B3' in hexadecimal. It identifies the beginning of a GOV header. vop_start_code: This is the bit string '000001B6' in hexadecimal. */ dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE); if (dword != 1){ /* if it's not 23 zeros followed by 1 it isn't a start code */ proto_tree_add_text(tree, tvb, bit_offset>>3, -1, "Data"); return; } proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE); bit_offset = bit_offset+24; dword = tvb_get_bits8(tvb,bit_offset, 8); proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE); bit_offset = bit_offset+8; switch(dword){ /* vop_start_code */ case 0xb6: /* vop_coding_type 2 bits */ proto_tree_add_bits_item(tree, hf_mp4ves_vop_coding_type, tvb, bit_offset, 2, FALSE); break; default: break; } } } /* * Parameter name profileAndLevel * Parameter description This is a nonCollapsing GenericParameter * Parameter identifier value 0 * Parameter status Mandatory * Parameter type unsignedMax. Shall be in the range 0..255. * H245: * unsignedMax INTEGER(0..65535), -- Look for max */ static int dissect_mp4ves_par_profile(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree _U_) { int offset = 0; guint16 lvl; const gchar *p = NULL; asn1_ctx_t *actx; actx = get_asn1_ctx(pinfo->private_data); DISSECTOR_ASSERT(actx); lvl = tvb_get_ntohs(tvb, offset); p = match_strval(lvl, VALS(mp4ves_level_indication_vals)); if (p) { proto_item_append_text(actx->created_item, " - profileAndLevel %s", p); } offset += 2; return offset; } static int dissect_mp4ves_par_video_object_type(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree _U_) { int offset = 0; guint16 lvl; const gchar *p = NULL; asn1_ctx_t *actx; actx = get_asn1_ctx(pinfo->private_data); DISSECTOR_ASSERT(actx); lvl = tvb_get_ntohs(tvb, offset); p = match_strval(lvl, VALS(mp4ves_video_object_type_vals)); if (p) { proto_item_append_text(actx->created_item, " - video_object_type %s", p); } offset += 2; return offset; } typedef struct _mp4ves_capability_t { const gchar *id; const gchar *name; new_dissector_t content_pdu; } mp4ves_capability_t; static mp4ves_capability_t mp4ves_capability_tab[] = { /* ITU-T H.245 capabilities ISO/IEC 14496-2(m*/ { "GenericCapability/0.0.8.245.1.0.0/nonCollapsing/0", "profileAndLevel", dissect_mp4ves_par_profile }, { "GenericCapability/0.0.8.245.1.0.0/nonCollapsing/1", "object", dissect_mp4ves_par_video_object_type }, { NULL, NULL, NULL }, }; static mp4ves_capability_t *find_cap(const gchar *id) { mp4ves_capability_t *ftr = NULL; mp4ves_capability_t *f; for (f=mp4ves_capability_tab; f->id; f++) { if (!strcmp(id, f->id)) { ftr = f; break; } } return ftr; } static void dissect_mp4ves_name(tvbuff_t *tvb _U_, packet_info *pinfo, proto_tree *tree) { asn1_ctx_t *actx; mp4ves_capability_t *ftr = NULL; actx = get_asn1_ctx(pinfo->private_data); DISSECTOR_ASSERT(actx); if (tree) { ftr = find_cap(pinfo->match_string); if (ftr) { proto_item_append_text(actx->created_item, " - %s", ftr->name); proto_item_append_text(proto_item_get_parent(proto_tree_get_parent(tree)), ": %s", ftr->name); } else { proto_item_append_text(actx->created_item, " - unknown(%s)", pinfo->match_string); } } } void proto_reg_handoff_mp4ves(void) { static dissector_handle_t mp4ves_handle; static guint dynamic_payload_type; static gboolean mp4ves_prefs_initialized = FALSE; if (!mp4ves_prefs_initialized) { dissector_handle_t mp4ves_name_handle; mp4ves_capability_t *ftr; mp4ves_handle = find_dissector("mp4ves"); dissector_add_string("rtp_dyn_payload_type","MP4V-ES", mp4ves_handle); mp4ves_prefs_initialized = TRUE; mp4ves_name_handle = create_dissector_handle(dissect_mp4ves_name, proto_mp4ves); for (ftr=mp4ves_capability_tab; ftr->id; ftr++) { if (ftr->name) dissector_add_string("h245.gef.name", ftr->id, mp4ves_name_handle); if (ftr->content_pdu) dissector_add_string("h245.gef.content", ftr->id, new_create_dissector_handle(ftr->content_pdu, proto_mp4ves)); } }else{ if ( dynamic_payload_type > 95 ) dissector_delete("rtp.pt", dynamic_payload_type, mp4ves_handle); } dynamic_payload_type = global_dynamic_payload_type; if ( dynamic_payload_type > 95 ){ dissector_add("rtp.pt", dynamic_payload_type, mp4ves_handle); } } void proto_register_mp4ves(void) { /* Setup list of header fields See Section 1.6.1 for details*/ static hf_register_info hf[] = { { &hf_mp4ves_config, { "Configuration", "mp4ves.configuration", FT_BYTES, BASE_NONE, NULL, 0x0, "Configuration", HFILL } }, { &hf_mp4ves_start_code_prefix, { "start code prefix", "mp4ves.start_code_prefix", FT_UINT32, BASE_HEX, NULL, 0x0, "start code prefix", HFILL } }, { &hf_mp4ves_start_code, { "Start code", "mp4ves.start_code", FT_UINT32, BASE_HEX, RVALS(&mp4ves_startcode_vals), 0x0, "Start code", HFILL } }, { &hf_mp4ves_vop_coding_type, { "vop_coding_type", "mp4ves.vop_coding_type", FT_UINT8, BASE_DEC, VALS(mp4ves_vop_coding_type_vals), 0x0, "Start code", HFILL } }, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_mp4ves, &ett_mp4ves_config, }; module_t *mp4ves_module; /* Register the protocol name and description */ proto_mp4ves = proto_register_protocol("MP4V-ES","MP4V-ES", "mp4v-es"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_mp4ves, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); /* Register a configuration option for port */ register_dissector("mp4ves", dissect_mp4ves, proto_mp4ves); /* Register a configuration option for port */ mp4ves_module = prefs_register_protocol(proto_mp4ves, proto_reg_handoff_mp4ves); prefs_register_uint_preference(mp4ves_module, "dynamic.payload.type", "MP4V-ES dynamic payload type", "The dynamic payload type which will be interpreted as MP4V-ES", 10, &global_dynamic_payload_type); }