/* * packet-mp4ves.c * Routines for MPEG4 dissection * Copyright 2007-2008, Anders Broman * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later * * References: * https://tools.ietf.org/html/rfc3016 */ #include "config.h" #include #include #include #include #include "packet-mp4ves.h" void proto_register_mp4ves(void); void proto_reg_handoff_mp4ves(void); /* Initialize the protocol and registered fields */ static int proto_mp4ves; static int hf_mp4ves_config; static int hf_mp4ves_start_code_prefix; static int hf_mp4ves_start_code; static int hf_mp4ves_vop_coding_type; static int hf_mp4ves_profile_and_level_indication; static int hf_mp4ves_is_visual_object_identifier; static int hf_mp4ves_visual_object_type; static int hf_mp4ves_video_signal_type; static int hf_mp4ves_stuffing; static int hf_mp4ves_video_object_type_indication; static int hf_mp4ves_random_accessible_vol; static int hf_mp4ves_is_object_layer_identifier; static int hf_mp4ves_aspect_ratio_info; static int hf_mp4ves_vol_control_parameters; static int hf_mp4ves_video_object_layer_shape; static int hf_mp4ves_user_data; static int hf_mp4ves_data; /* Initialize the subtree pointers */ static int ett_mp4ves; static int ett_mp4ves_config; static expert_field ei_mp4ves_config_too_short; static expert_field ei_mp4ves_not_dissected_bits; static dissector_handle_t mp4ves_name_handle; static dissector_handle_t mp4ves_handle; /* 14496-2, Annex G, Table G-1. Table G-1 FLC table for profile_and_level_indication Profile/Level Code */ 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[] = { { 0x00, 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 } }; /* Visual object type */ static const value_string mp4ves_visual_object_type_vals[] = { { 0x0, "reserved" }, { 0x1, "video ID" }, { 0x2, "still texture ID" }, { 0x3, "mesh ID" }, { 0x4, "FBA ID" }, { 0x5, "3D mesh ID" }, { 0x6, "reserved" }, { 0x7, "reserved" }, { 0x8, "reserved" }, { 0x9, "reserved" }, { 0xa, "reserved" }, { 0xb, "reserved" }, { 0xc, "reserved" }, { 0xd, "reserved" }, { 0xe, "reserved" }, { 0xf, "reserved" }, { 0, NULL } }; static const value_string mp4ves_video_object_type_indication_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" }, { 0xf, "Reserved" }, /* Reserved 00001111 - 11111111 */ { 0, NULL } }; /* 6.2.2.1 User data */ static int dissect_mp4ves_user_data(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset) { int start_bit_offset; /* user_data_start_code */ proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, ENC_BIG_ENDIAN); bit_offset+=24; proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, ENC_BIG_ENDIAN); bit_offset+=8; start_bit_offset = bit_offset; /* while( next_bits() != '000 0000 0000 0000 0000 0001') { */ while ( tvb_get_bits32(tvb,bit_offset, 24, ENC_BIG_ENDIAN) != 1){ bit_offset+=8; /* user_data 8 bits */ } proto_tree_add_item(tree, hf_mp4ves_user_data, tvb, start_bit_offset>>3, (bit_offset - start_bit_offset)>>2, ENC_NA); return bit_offset; } /* next_start_code() { zero_bit while (!bytealigned()) one_bit } */ static int dissect_mp4ves_next_start_code(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset) { guint8 zero_bit; int start_bit_offset; start_bit_offset = bit_offset; zero_bit = tvb_get_bits8(tvb,bit_offset,1); if (zero_bit != 0){ /* Error */ } bit_offset++; /* zero stuffing bits */ if(bit_offset %8 == 0) return bit_offset; while(bit_offset %8 != 0){ bit_offset++; } proto_tree_add_bits_item(tree, hf_mp4ves_stuffing, tvb, start_bit_offset, bit_offset-start_bit_offset, ENC_BIG_ENDIAN); return bit_offset; } #if 0 video_signal_type() { video_signal_type if (video_signal_type) { video_format 3 uimsbf video_range 1 bslbf colour_description 1 bslbf if (colour_description) { colour_primaries 8 uimsbf transfer_characteristics 8 uimsbf matrix_coefficients 8 uimsbf } } } #endif static int dissect_mp4ves_visual_object_type(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset) { guint8 video_signal_type, colour_description; video_signal_type = tvb_get_bits8(tvb,bit_offset,1); proto_tree_add_bits_item(tree, hf_mp4ves_video_signal_type, tvb, bit_offset, 1, ENC_BIG_ENDIAN); bit_offset++; if (video_signal_type) { /* video_format 3 bits */ bit_offset+=3; /* video_range 1 bit */ bit_offset++; /* colour_description 1 bit */ colour_description = tvb_get_bits8(tvb,bit_offset,1); if (colour_description) { /* colour_primaries 8 bits */ bit_offset+=8; /* transfer_characteristics 8 bits */ bit_offset+=8; /* matrix_coefficients 8 bits*/ bit_offset+=8; } } return bit_offset; } /* * 6.2.3 Video Object Layer */ /* * Table 6-12 -- Meaning of pixel aspect ratio */ static const value_string mp4ves_aspect_ratio_info_vals[] = { { 0x0, "Forbidden" }, { 0x1, "1:1 (Square)" }, { 0x2, "12:11 (625-type for 4:3 picture)" }, { 0x3, "10:11 (525-type for 4:3 picture)" }, { 0x4, "16:11 (625-type stretched for 16:9 picture)" }, { 0x5, "40:33 (525-type stretched for 16:9 picture)" }, { 0x6, "Reserved" }, { 0x7, "Reserved" }, { 0x8, "Reserved" }, { 0x9, "Reserved" }, { 0xa, "Reserved" }, { 0xb, "Reserved" }, { 0xc, "Reserved" }, { 0xd, "Reserved" }, { 0xe, "Reserved" }, { 0xf, "Extended PAR" }, { 0, NULL } }; /* Table 6-14 Video Object Layer shape type */ static const value_string mp4ves_video_object_layer_shape_vals[] = { { 0x0, "rectangular" }, { 0x1, "binary" }, { 0x2, "binary only" }, { 0x3, "grayscale" }, { 0, NULL } }; static int dissect_mp4ves_VideoObjectLayer(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset) { guint32 dword; int current_bit_offset; guint8 octet, is_object_layer_identifier, aspect_ratio_info, vol_control_parameters, vbv_parameters; guint8 video_object_layer_shape, video_object_layer_verid = 0; /* if(next_bits() == video_object_layer_start_code) { */ dword = tvb_get_bits32(tvb,bit_offset, 24, ENC_BIG_ENDIAN); if (dword != 1){ return bit_offset; } octet = tvb_get_bits8(tvb,bit_offset+24, 8); if((octet>=0x20)&&(octet<=0x2f)){ /* Continue */ }else{ return bit_offset; } /* video_object_layer_start_code */ proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, ENC_BIG_ENDIAN); bit_offset+=24; proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, ENC_BIG_ENDIAN); bit_offset+= 8; /* short_video_header = 0 */ /* random_accessible_vol 1 */ proto_tree_add_bits_item(tree, hf_mp4ves_random_accessible_vol, tvb, bit_offset, 1, ENC_BIG_ENDIAN); bit_offset++; /* video_object_type_indication 8 */ proto_tree_add_bits_item(tree, hf_mp4ves_video_object_type_indication, tvb, bit_offset, 8, ENC_BIG_ENDIAN); bit_offset+= 8; /* is_object_layer_identifier 1 */ is_object_layer_identifier = tvb_get_bits8(tvb,bit_offset, 1); proto_tree_add_bits_item(tree, hf_mp4ves_is_object_layer_identifier, tvb, bit_offset, 1, ENC_BIG_ENDIAN); bit_offset++; if(is_object_layer_identifier) { /* video_object_layer_verid 4 uimsbf */ bit_offset+=4; /* video_object_layer_priority 3 uimsbf */ bit_offset+=3; } /* aspect_ratio_info 4 uimsbf */ aspect_ratio_info = tvb_get_bits8(tvb,bit_offset, 1); proto_tree_add_bits_item(tree, hf_mp4ves_aspect_ratio_info, tvb, bit_offset, 4, ENC_BIG_ENDIAN); if (aspect_ratio_info == 0xf /*"extended_PAR"*/ ) { /* par_width 8 uimsbf */ bit_offset+=8; /* par_height 8 uimsbf */ bit_offset+=8; } /* vol_control_parameters 1 bslbf */ /* vol_control_parameters 1 bslbf */ vol_control_parameters = tvb_get_bits8(tvb,bit_offset, 1); proto_tree_add_bits_item(tree, hf_mp4ves_vol_control_parameters, tvb, bit_offset, 1, ENC_BIG_ENDIAN); bit_offset++; current_bit_offset = bit_offset; if (vol_control_parameters) { /* chroma_format 2 uimsbf */ bit_offset+=2; /* low_delay 1 uimsbf */ bit_offset++; /* vbv_parameters 1 blsbf */ vbv_parameters = tvb_get_bits8(tvb,bit_offset, 1); bit_offset++; if (vbv_parameters) { /* first_half_bit_rate 15 uimsbf */ bit_offset+=15; /* marker_bit 1 bslbf */ bit_offset++; /* latter_half_bit_rate 15 uimsbf */ bit_offset+=15; /* marker_bit 1 bslbf */ bit_offset++; /* first_half_vbv_buffer_size 15 uimsbf */ bit_offset+=15; /* marker_bit 1 bslbf */ bit_offset++; /* latter_half_vbv_buffer_size 3 uimsbf */ bit_offset+=3; /* first_half_vbv_occupancy 11 uimsbf */ bit_offset+=11; /* marker_bit 1 blsbf */ bit_offset++; /* latter_half_vbv_occupancy 15 uimsbf */ bit_offset+=15; /* marker_bit 1 blsbf */ bit_offset++; } } if(bit_offset-current_bit_offset > 0) proto_tree_add_expert(tree, pinfo, &ei_mp4ves_not_dissected_bits, tvb, current_bit_offset>>3, (bit_offset+7)>>3); /* video_object_layer_shape 2 uimsbf */ video_object_layer_shape = tvb_get_bits8(tvb,bit_offset, 2); proto_tree_add_bits_item(tree, hf_mp4ves_video_object_layer_shape, tvb, bit_offset, 2, ENC_BIG_ENDIAN); bit_offset+=2; if (video_object_layer_shape == 3/*"grayscale"*/&& video_object_layer_verid != 1){ /* video_object_layer_shape_extension 4 uimsbf */ bit_offset+=4; } /* marker_bit 1 bslbf */ bit_offset++; /* vop_time_increment_resolution 16 uimsbf */ bit_offset+=16; /* marker_bit 1 bslbf */ bit_offset++; /* fixed_vop_rate 1 bslbf */ bit_offset++; return bit_offset; } /* Visual object */ /* VisualObject() { visual_object_start_code is_visual_object_identifier if (is_visual_object_identifier) { visual_object_verid visual_object_priority } visual_object_type if (visual_object_type == "Video ID" || visual_object_type == "still textureID") { video_signal_type() } next_start_code() while ( next_bits()== user_data_start_code){ user_data() } if (visual_object_type == "Video ID") { video_object_start_code VideoObjectLayer() } else if (visual_object_type == "still texture ID") { StillTextureObject() } else if (visual_object_type == "mesh ID") { MeshObject() } else if (visual_object_type == "FBA ID") { FBAObject() } else if (visual_object_type == "3D mesh ID") { 3D_Mesh_Object() } if (next_bits() != "0000 0000 0000 0000 0000 0001") next_start_code() } */ static int dissect_mp4ves_VisualObject(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int bit_offset) { guint8 is_visual_object_identifier, visual_object_type; guint32 dword; guint8 octet; is_visual_object_identifier = tvb_get_bits8(tvb,bit_offset,1); proto_tree_add_bits_item(tree, hf_mp4ves_is_visual_object_identifier, tvb, bit_offset, 1, ENC_BIG_ENDIAN); bit_offset++; if(is_visual_object_identifier){ /* visual_object_verid 4 bits*/ bit_offset+=4; /* visual_object_priority 3 bits*/ bit_offset+=3; } /* visual_object_type 4 bits*/ visual_object_type = tvb_get_bits8(tvb,bit_offset,4); proto_tree_add_bits_item(tree, hf_mp4ves_visual_object_type, tvb, bit_offset, 4, ENC_BIG_ENDIAN); bit_offset+=4; if ((visual_object_type == 1/*"Video ID"*/) || (visual_object_type == 2/*"still textureID"*/)) { /* video_signal_type() */ bit_offset = dissect_mp4ves_visual_object_type(tvb, pinfo, tree, bit_offset); } /* next_start_code() */ bit_offset = dissect_mp4ves_next_start_code(tvb, pinfo, tree, bit_offset); dword = tvb_get_bits32(tvb,bit_offset, 32, ENC_BIG_ENDIAN); /* while ( next_bits()== user_data_start_code){ user_data() } */ while(dword==0x1b2){ bit_offset = dissect_mp4ves_user_data(tvb, pinfo, tree, bit_offset); dword = tvb_get_bits32(tvb,bit_offset, 32, ENC_BIG_ENDIAN); } if (visual_object_type == 1/*"Video ID"*/) { /* * video_object_start_code */ dword = tvb_get_bits32(tvb,bit_offset, 24, ENC_BIG_ENDIAN); if (dword != 1){ /* no start code */ return -1; } octet = tvb_get_bits8(tvb,bit_offset+24, 8); if(octet>0x20){ /* Error */ return -1; } proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, ENC_BIG_ENDIAN); bit_offset+=24; proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, ENC_BIG_ENDIAN); bit_offset+= 8; if(tvb_reported_length_remaining(tvb,(bit_offset>>3))<=0){ proto_tree_add_expert(tree, pinfo, &ei_mp4ves_config_too_short, tvb, 0, -1); return -1; } /* VideoObjectLayer() */ bit_offset = dissect_mp4ves_VideoObjectLayer(tvb, pinfo, tree, bit_offset); } return bit_offset; } static int dissect_mp4ves_VisualObjectSequence(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int bit_offset) { guint32 dword; /*VisualObjectSequence() { do { visual_object_sequence_start_code */ /* Get start code prefix */ dword = tvb_get_bits32(tvb,bit_offset, 32, ENC_BIG_ENDIAN); if ((dword & 0x00000100) != 0x00000100){ /* No start code prefix */ return -1; } proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, ENC_BIG_ENDIAN); bit_offset+= 24; proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, ENC_BIG_ENDIAN); bit_offset+= 8; /* Expect visual_object_sequence_start_code */ if(dword != 0x1b0) return -1; /* profile_and_level_indication */ proto_tree_add_bits_item(tree, hf_mp4ves_profile_and_level_indication, tvb, bit_offset, 8, ENC_BIG_ENDIAN); bit_offset+= 8; /* while ( next_bits()== user_data_start_code){ user_data() } */ dword = tvb_get_bits32(tvb,bit_offset, 32, ENC_BIG_ENDIAN); bit_offset+= 32; if ((dword & 0x00000100) != 0x00000100){ /* No start code prefix */ return -1; } if(dword==0x1b2){ /* * user_data_start_code * XXX call user data dissection here */ return -1; } if(dword==0x1b5){ /* * VisualObject() */ bit_offset = dissect_mp4ves_VisualObject(tvb, pinfo, tree, bit_offset); } /* } while ( next_bits() != visual_object_sequence_end_code) visual_object_sequence_end_code */ return bit_offset; } static int dissect_mp4ves_config(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_item *item; proto_tree *mp4ves_tree; item = proto_tree_add_item(tree, hf_mp4ves_config, tvb, 0, -1, ENC_NA); mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves_config); dissect_mp4ves_VisualObjectSequence(tvb, pinfo, mp4ves_tree, 0); return tvb_captured_length(tvb); } static int dissect_mp4ves(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { int bit_offset = 0; proto_item *item; proto_tree *mp4ves_tree; guint32 dword; /* Make entries in Protocol column and Info column on summary display */ col_set_str(pinfo->cinfo, COL_PROTOCOL, "MP4V-ES"); if (tree) { item = proto_tree_add_item(tree, proto_mp4ves, tvb, 0, -1, ENC_NA); 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 Otherwise 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. */ if (tvb_reported_length(tvb)< 4){ /* To short to be a start code */ proto_tree_add_item(mp4ves_tree, hf_mp4ves_data, tvb, bit_offset>>3, -1, ENC_NA); return tvb_captured_length(tvb); } dword = tvb_get_bits32(tvb,bit_offset, 24, ENC_BIG_ENDIAN); if (dword != 1){ /* if it's not 23 zeros followed by 1 it isn't a start code */ proto_tree_add_item(mp4ves_tree, hf_mp4ves_data, tvb, bit_offset>>3, -1, ENC_NA); return tvb_captured_length(tvb); } dword = tvb_get_bits8(tvb,24, 8); bit_offset = bit_offset+8; switch(dword){ /* vop_start_code */ case 0xb6: proto_tree_add_bits_item(mp4ves_tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, ENC_BIG_ENDIAN); bit_offset = bit_offset+24; /* vop_coding_type 2 bits */ proto_tree_add_bits_item(mp4ves_tree, hf_mp4ves_vop_coding_type, tvb, bit_offset, 2, ENC_BIG_ENDIAN); break; case 0xb0: /* VS start code */ /*bit_offset = */dissect_mp4ves_VisualObjectSequence(tvb, pinfo, mp4ves_tree, 0); break; default: proto_tree_add_bits_item(mp4ves_tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, ENC_BIG_ENDIAN); /*bit_offset = bit_offset+24;*/ break; } } return tvb_captured_length(tvb); } /* * 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_, void *data) { int offset = 0; guint16 lvl; const gchar *p = NULL; asn1_ctx_t *actx; /* Reject the packet if data is NULL */ if (data == NULL) return 0; actx = get_asn1_ctx(data); DISSECTOR_ASSERT(actx); lvl = tvb_get_ntohs(tvb, offset); p = try_val_to_str(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_, void *data) { int offset = 0; guint16 lvl; const gchar *p = NULL; asn1_ctx_t *actx; /* Reject the packet if data is NULL */ if (data == NULL) return 0; actx = get_asn1_ctx(data); DISSECTOR_ASSERT(actx); lvl = tvb_get_ntohs(tvb, offset); p = try_val_to_str(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; } static int dissect_mp4ves_par_decoderConfigurationInformation(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data) { asn1_ctx_t *actx; /* Reject the packet if data is NULL */ if (data == NULL) return 0; actx = get_asn1_ctx(data); DISSECTOR_ASSERT(actx); dissect_mp4ves_config(tvb, pinfo, tree, data); return tvb_reported_length(tvb); } typedef struct _mp4ves_capability_t { const gchar *id; const gchar *name; 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 }, { "GenericCapability/0.0.8.245.1.0.0/nonCollapsing/2", "decoderConfigurationInformation", dissect_mp4ves_par_decoderConfigurationInformation }, { "GenericCapability/0.0.8.245.1.0.0/nonCollapsing/3", "drawingOrder", NULL }, { "GenericCapability/0.0.8.245.1.0.0/collapsing/4", "visualBackChannelHandle", NULL }, { 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 int dissect_mp4ves_name(tvbuff_t *tvb _U_, packet_info *pinfo, proto_tree *tree, void* data) { asn1_ctx_t *actx; mp4ves_capability_t *ftr; /* Reject the packet if data is NULL */ if (data == NULL) return 0; actx = get_asn1_ctx(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); } } return tvb_reported_length(tvb); } 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, NULL, HFILL } }, { &hf_mp4ves_start_code_prefix, { "start code prefix", "mp4ves.start_code_prefix", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_mp4ves_start_code, { "Start code", "mp4ves.start_code", FT_UINT8, BASE_RANGE_STRING|BASE_HEX, RVALS(mp4ves_startcode_vals), 0x0, NULL, 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 } }, {&hf_mp4ves_profile_and_level_indication, { "profile_and_level_indication", "mp4ves.profile_and_level_indication", FT_UINT8, BASE_DEC,VALS(mp4ves_level_indication_vals), 0x0, NULL, HFILL } }, { &hf_mp4ves_is_visual_object_identifier, { "visual_object_identifier", "mp4ves.visual_object_identifier", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_mp4ves_visual_object_type, { "visual_object_type", "mp4ves.visual_object_type", FT_UINT32, BASE_DEC, VALS(mp4ves_visual_object_type_vals), 0x0, NULL, HFILL } }, { &hf_mp4ves_video_signal_type, { "video_signal_type", "mp4ves.video_signal_type", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_mp4ves_stuffing, { "Stuffing", "mp4ves.stuffing", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_mp4ves_video_object_type_indication, { "video_object_type_indication", "mp4ves.video_object_type_indication", FT_UINT8, BASE_DEC, VALS(mp4ves_video_object_type_indication_vals), 0x0, NULL, HFILL } }, { &hf_mp4ves_random_accessible_vol, { "random_accessible_vol", "mp4ves.random_accessible_vol", FT_UINT8, BASE_DEC, NULL, 0x0, "video_object_type_indication", HFILL } }, { &hf_mp4ves_is_object_layer_identifier, { "is_object_layer_identifier", "mp4ves.is_object_layer_identifier", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_mp4ves_aspect_ratio_info, { "aspect_ratio_info", "mp4ves.aspect_ratio_info", FT_UINT8, BASE_DEC, VALS(mp4ves_aspect_ratio_info_vals), 0x0, NULL, HFILL } }, { &hf_mp4ves_vol_control_parameters, { "vol_control_parameters", "mp4ves.vol_control_parameters", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_mp4ves_video_object_layer_shape, { "video_object_layer_shape", "mp4ves.video_object_layer_shape", FT_UINT8, BASE_DEC, VALS(mp4ves_video_object_layer_shape_vals), 0x0, NULL, HFILL } }, { &hf_mp4ves_user_data, { "User data", "mp4ves.user_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_mp4ves_data, { "Data", "mp4ves.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_mp4ves, &ett_mp4ves_config, }; static ei_register_info ei[] = { { &ei_mp4ves_config_too_short, { "mp4ves.config_too_short", PI_MALFORMED, PI_ERROR, "Config string too short", EXPFILL }}, { &ei_mp4ves_not_dissected_bits, { "mp4ves.not_dissected_bits", PI_UNDECODED, PI_WARN, "Not dissected bits", EXPFILL }}, }; module_t *mp4ves_module; expert_module_t* expert_mp4ves; /* 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)); expert_mp4ves = expert_register_protocol(proto_mp4ves); expert_register_field_array(expert_mp4ves, ei, array_length(ei)); /* Register a configuration option for port */ mp4ves_handle = register_dissector("mp4ves", dissect_mp4ves, proto_mp4ves); register_dissector("mp4ves_config", dissect_mp4ves_config, proto_mp4ves); /* Register a configuration option for port */ mp4ves_module = prefs_register_protocol(proto_mp4ves, NULL); prefs_register_obsolete_preference(mp4ves_module, "dynamic.payload.type"); } void proto_reg_handoff_mp4ves(void) { mp4ves_capability_t *ftr; dissector_add_string("rtp_dyn_payload_type","MP4V-ES", mp4ves_handle); 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, create_dissector_handle(ftr->content_pdu, proto_mp4ves)); } dissector_add_uint_range_with_preference("rtp.pt", "", mp4ves_handle); } /* * Editor modelines - https://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 8 * tab-width: 8 * indent-tabs-mode: t * End: * * vi: set shiftwidth=8 tabstop=8 noexpandtab: * :indentSize=8:tabSize=8:noTabs=false: */