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wireshark/epan/dissectors/packet-mp4ves.c

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/*
* 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
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* References:
* http://www.ietf.org/rfc/rfc3016.txt?number=3016
*/
#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;
/* 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
*/
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;
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 },
{ "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 */
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, 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);
}
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, create_dissector_handle(ftr->content_pdu, proto_mp4ves));
}
}else{
if ( dynamic_payload_type > 95 )
dissector_delete_uint("rtp.pt", dynamic_payload_type, mp4ves_handle);
}
dynamic_payload_type = global_dynamic_payload_type;
if ( dynamic_payload_type > 95 ){
dissector_add_uint("rtp.pt", dynamic_payload_type, mp4ves_handle);
}
}
/*
* Editor modelines - http://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:
*/
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