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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-10 20:34:10 +0000 |
commit | e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc (patch) | |
tree | 68cb5ef9081156392f1dd62a00c6ccc1451b93df /epan/dissectors/packet-mp4ves.c | |
parent | Initial commit. (diff) | |
download | wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.tar.xz wireshark-e4ba6dbc3f1e76890b22773807ea37fe8fa2b1bc.zip |
Adding upstream version 4.2.2.upstream/4.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'epan/dissectors/packet-mp4ves.c')
-rw-r--r-- | epan/dissectors/packet-mp4ves.c | 1046 |
1 files changed, 1046 insertions, 0 deletions
diff --git a/epan/dissectors/packet-mp4ves.c b/epan/dissectors/packet-mp4ves.c new file mode 100644 index 00000000..0f22c09a --- /dev/null +++ b/epan/dissectors/packet-mp4ves.c @@ -0,0 +1,1046 @@ +/* + * packet-mp4ves.c + * Routines for MPEG4 dissection + * Copyright 2007-2008, Anders Broman <anders.broman[at]ericsson.com> + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * SPDX-License-Identifier: GPL-2.0-or-later + * + * References: + * https://tools.ietf.org/html/rfc3016 + */ + +#include "config.h" + + +#include <epan/packet.h> +#include <epan/expert.h> +#include <epan/asn1.h> + +#include <epan/prefs.h> + +#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 = -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; +static int hf_mp4ves_profile_and_level_indication = -1; +static int hf_mp4ves_is_visual_object_identifier = -1; +static int hf_mp4ves_visual_object_type = -1; +static int hf_mp4ves_video_signal_type = -1; +static int hf_mp4ves_stuffing = -1; +static int hf_mp4ves_video_object_type_indication = -1; +static int hf_mp4ves_random_accessible_vol = -1; +static int hf_mp4ves_is_object_layer_identifier = -1; +static int hf_mp4ves_aspect_ratio_info = -1; +static int hf_mp4ves_vol_control_parameters = -1; +static int hf_mp4ves_video_object_layer_shape = -1; +static int hf_mp4ves_user_data = -1; +static int hf_mp4ves_data = -1; + +/* Initialize the subtree pointers */ +static int ett_mp4ves = -1; +static int ett_mp4ves_config = -1; + +static expert_field ei_mp4ves_config_too_short = EI_INIT; +static expert_field ei_mp4ves_not_dissected_bits = EI_INIT; + +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: + */ |