forked from osmocom/wireshark
0e1613fbe5
- Use 'dissector standard template format' - Remove 'once-only' ["if (!initialized) ..."] if not req'd - Misc Also: adjust some indentation svn path=/trunk/; revision=27324
1037 lines
32 KiB
C
1037 lines
32 KiB
C
/*
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* packet-mp4ves.c
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* Routines for MPEG4 dissection
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* Copyright 2007-2008, Anders Broman <anders.broman[at]ericsson.com>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* References:
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* http://www.ietf.org/rfc/rfc3016.txt?number=3016
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/proto.h>
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#include <epan/asn1.h>
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#include "prefs.h"
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/* Initialize the protocol and registered fields */
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static int proto_mp4ves = -1;
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static int hf_mp4ves_config = -1;
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static int hf_mp4ves_start_code_prefix = -1;
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static int hf_mp4ves_start_code = -1;
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static int hf_mp4ves_vop_coding_type = -1;
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static int hf_mp4ves_profile_and_level_indication = -1;
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static int hf_mp4ves_is_visual_object_identifier = -1;
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static int hf_mp4ves_visual_object_type = -1;
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static int hf_mp4ves_video_signal_type = -1;
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static int hf_mp4ves_stuffing = -1;
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static int hf_mp4ves_video_object_type_indication = -1;
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static int hf_mp4ves_random_accessible_vol = -1;
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static int hf_mp4ves_is_object_layer_identifier = -1;
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static int hf_mp4ves_aspect_ratio_info = -1;
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static int hf_mp4ves_vol_control_parameters = -1;
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static int hf_mp4ves_video_object_layer_shape = -1;
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/* Initialize the subtree pointers */
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static int ett_mp4ves = -1;
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static int ett_mp4ves_config = -1;
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/* The dynamic payload type which will be dissected as MP4V-ES */
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static guint global_dynamic_payload_type = 0;
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/*
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14496-2, Annex G, Table G-1.
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Table G-1 FLC table for profile_and_level_indication Profile/Level Code
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*/
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const value_string mp4ves_level_indication_vals[] =
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{
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{ 0, "Reserved" },
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{ 1, "Simple Profile/Level 1" },
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{ 2, "Simple Profile/Level 2" },
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{ 3, "Reserved" },
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{ 4, "Reserved" },
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{ 5, "Reserved" },
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{ 6, "Reserved" },
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{ 7, "Reserved" },
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{ 8, "Simple Profile/Level 0" },
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{ 9, "Simple Profile/Level 0b" },
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/* Reserved 00001001 - 00010000 */
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{ 0x11, "Simple Scalable Profile/Level 1" },
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{ 0x12, "Simple Scalable Profile/Level 2" },
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/* Reserved 00010011 - 00100000 */
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{ 0x21, "Core Profile/Level 1" },
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{ 0x22, "Core Profile/Level 2" },
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/* Reserved 00100011 - 00110001 */
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{ 0x32, "Main Profile/Level 2" },
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{ 0x33, "Main Profile/Level 3" },
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{ 0x34, "Main Profile/Level 4" },
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/* Reserved 00110101 - 01000001 */
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{ 0x42, "N-bit Profile/Level 2" },
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/* Reserved 01000011 - 01010000 */
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{ 0x51, "Scalable Texture Profile/Level 1" },
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/* Reserved 01010010 - 01100000 */
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{ 0x61, "Simple Face Animation Profile/Level 1" },
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{ 0x62, "Simple Face Animation Profile/Level 2" },
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{ 0x63, "Simple FBA Profile/Level 1" },
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{ 0x64, "Simple FBA Profile/Level 2" },
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/* Reserved 01100101 - 01110000 */
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{ 0x71, "Basic Animated Texture Profile/Level 1" },
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{ 0x72, "Basic Animated Texture Profile/Level 2" },
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/* Reserved 01110011 - 10000000 */
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{ 0x81, "Hybrid Profile/Level 1" },
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{ 0x82, "Hybrid Profile/Level 2" },
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/* Reserved 10000011 - 10010000 */
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{ 0x91, "Advanced Real Time Simple Profile/Level 1" },
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{ 0x92, "Advanced Real Time Simple Profile/Level 2" },
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{ 0x93, "Advanced Real Time Simple Profile/Level 3" },
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{ 0x94, "Advanced Real Time Simple Profile/Level 4" },
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/* Reserved 10010101 - 10100000 */
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{ 0xa1, "Core Scalable Profile/Level 1" },
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{ 0xa2, "Core Scalable Profile/Level 2" },
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{ 0xa3, "Core Scalable Profile/Level 3" },
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/* Reserved 10100100 - 10110000 */
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{ 0xb1, "Advanced Coding Efficiency Profile/Level 1" },
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{ 0xb2, "Advanced Coding Efficiency Profile/Level 2" },
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{ 0xb3, "Advanced Coding Efficiency Profile/Level 3" },
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{ 0xb4, "Advanced Coding Efficiency Profile/Level 4" },
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/* Reserved 10110101 - 11000000 */
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{ 0xc1, "Advanced Core Profile/Level 1" },
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{ 0xc2, "Advanced Core Profile/Level 2" },
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/* Reserved 11000011 - 11010000 */
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{ 0xd1, "Advanced Scalable Texture/Level 1" },
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{ 0xd2, "Advanced Scalable Texture/Level 2" },
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{ 0xd3, "Advanced Scalable Texture/Level 3" },
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/* Reserved 11010100 - 11100000 */
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{ 0xe1, "Simple Studio Profile/Level 1" },
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{ 0xe2, "Simple Studio Profile/Level 2" },
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{ 0xe3, "Simple Studio Profile/Level 3" },
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{ 0xe4, "Simple Studio Profile/Level 4" },
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{ 0xe5, "Core Studio Profile/Level 1" },
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{ 0xe6, "Core Studio Profile/Level 2" },
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{ 0xe7, "Core Studio Profile/Level 3" },
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{ 0xe8, "Core Studio Profile/Level 4" },
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/* Reserved 11101001 - 11101111 */
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{ 0xf0, "Advanced Simple Profile/Level 0" },
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{ 0xf1, "Advanced Simple Profile/Level 1" },
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{ 0xf2, "Advanced Simple Profile/Level 2" },
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{ 0xf3, "Advanced Simple Profile/Level 3" },
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{ 0xf4, "Advanced Simple Profile/Level 4" },
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{ 0xf5, "Advanced Simple Profile/Level 5" },
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/* Reserved 11110110 - 11110111 */
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{ 0xf8, "Fine Granularity Scalable Profile/Level 0" },
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{ 0xf9, "Fine Granularity Scalable Profile/Level 1" },
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{ 0xfa, "Fine Granularity Scalable Profile/Level 2" },
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{ 0xfb, "Fine Granularity Scalable Profile/Level 3" },
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{ 0xfc, "Fine Granularity Scalable Profile/Level 4" },
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{ 0xfd, "Fine Granularity Scalable Profile/Level 5" },
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{ 0xfe, "Reserved" },
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{ 0xff, "Reserved for Escape" },
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{ 0, NULL },
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};
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static const range_string mp4ves_startcode_vals[] = {
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{ 0x00, 0x1f, "video_object_start_code" },
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{ 0x20, 0x2f, "video_object_layer_start_code" },
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{ 0x30, 0xaf, "reserved" },
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{ 0xb0, 0xb0, "visual_object_sequence_start_code" },
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{ 0xb1, 0xb1, "visual_object_sequence_end_code" },
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{ 0xb2, 0xb2, "user_data_start_code" },
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{ 0xb3, 0xb3, "group_of_vop_start_code" },
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{ 0xb4, 0xb4, "video_session_error_code" },
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{ 0xb5, 0xb5, "visual_object_start_code" },
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{ 0xb6, 0xb6, "vop_start_code" },
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{ 0xb7, 0xb9, "reserved" },
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{ 0xba, 0xba, "fba_object_start_code" },
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{ 0xbb, 0xbb, "fba_object_plane_start_code" },
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{ 0xbc, 0xbc, "mesh_object_start_code" },
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{ 0xbd, 0xbd, "mesh_object_plane_start_code" },
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{ 0xbe, 0xbe, "still_texture_object_start_code" },
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{ 0xbf, 0xbf, "texture_spatial_layer_start_code" },
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{ 0xc0, 0xc0, "texture_snr_layer_start_code" },
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{ 0xc1, 0xc1, "texture_tile_start_code" },
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{ 0xc2, 0xc2, "texture_shape_layer_start_code" },
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{ 0xc3, 0xc3, "stuffing_start_code" },
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{ 0xc4, 0xc5, "reserved" },
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{ 0xc6, 0xcf, "System start codes" }, /* NOTE System start codes are defined in ISO/IEC 14496-1:1999 */
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{ 0, 0, NULL }
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};
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static const value_string mp4ves_vop_coding_type_vals[] = {
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{ 0, "intra-coded (I)" },
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{ 1, "predictive-coded (P)" },
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{ 2, "bidirectionally-predictive-coded (B)" },
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{ 3, "sprite (S)" },
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{ 0, NULL }
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};
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/*
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* FLC table for video_object_type indication
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*/
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static const value_string mp4ves_video_object_type_vals[] = {
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{ 0x0, "Reserved" },
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{ 0x1, "Simple Object Type" },
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{ 0x2, "Simple Scalable Object Type" },
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{ 0x3, "Core Object Type" },
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{ 0x4, "Main Object Type" },
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{ 0x5, "N-bit Object Type" },
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{ 0x6, "Basic Anim. 2D Texture" },
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{ 0x7, "Anim. 2D Mesh" },
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{ 0x8, "Simple Face" },
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{ 0x9, "Still Scalable Texture" },
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{ 0xa, "Advanced Real Time Simple" },
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{ 0xb, "Core Scalable" },
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{ 0xc, "Advanced Coding Efficiency" },
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{ 0xd, "Advanced Scalable Texture" },
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{ 0xe, "Simple FBA" },
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{ 0, NULL }
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};
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/* Visual object type */
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static const value_string mp4ves_visual_object_type_vals[] = {
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{ 0x0, "reserved" },
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{ 0x1, "video ID" },
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{ 0x2, "still texture ID" },
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{ 0x3, "mesh ID" },
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{ 0x4, "FBA ID" },
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{ 0x5, "3D mesh ID" },
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{ 0x6, "reserved" },
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{ 0x7, "reserved" },
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{ 0x8, "reserved" },
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{ 0x9, "reserved" },
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{ 0xa, "reserved" },
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{ 0xb, "reserved" },
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{ 0xc, "reserved" },
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{ 0xd, "reserved" },
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{ 0xe, "reserved" },
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{ 0xf, "reserved" },
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{ 0, NULL }
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};
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static const value_string mp4ves_video_object_type_indication_vals[] = {
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{ 0x0, "Reserved" },
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{ 0x1, "Simple Object Type" },
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{ 0x2, "Simple Scalable Object Type" },
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{ 0x3, "Core Object Type" },
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{ 0x4, "Main Object Type" },
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{ 0x5, "N-bit Object Type" },
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{ 0x6, "Basic Anim. 2D Texture" },
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{ 0x7, "Anim. 2D Mesh" },
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{ 0x8, "Simple Face" },
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{ 0x9, "Still Scalable Texture" },
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{ 0xa, "Advanced Real Time Simple" },
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{ 0xb, "Core Scalable" },
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{ 0xc, "Advanced Coding Efficiency" },
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{ 0xd, "Advanced Scalable Texture" },
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{ 0xe, "Simple FBA" },
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{ 0xf, "Reserved" },
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/* Reserved 00001111 - 11111111 */
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{ 0, NULL }
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};
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/* 6.2.2.1 User data */
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static int
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dissect_mp4ves_user_data(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset)
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{
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int start_bit_offset;
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/* user_data_start_code */
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proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE);
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bit_offset+=24;
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proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE);
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bit_offset+=8;
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start_bit_offset = bit_offset;
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/* while( next_bits() != '000 0000 0000 0000 0000 0001') { */
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while ( tvb_get_bits32(tvb,bit_offset, 24, FALSE) != 1){
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bit_offset+=8;
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/* user_data 8 bits */
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}
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proto_tree_add_text(tree, tvb, start_bit_offset>>3, (bit_offset - start_bit_offset)>>2, "User data");
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return bit_offset;
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}
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/*
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next_start_code() {
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zero_bit
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while (!bytealigned())
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one_bit
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}
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*/
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static int
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dissect_mp4ves_next_start_code(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset)
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{
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guint8 zero_bit;
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int start_bit_offset;
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start_bit_offset = bit_offset;
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zero_bit = tvb_get_bits8(tvb,bit_offset,1);
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if (zero_bit != 0){
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/* Error */
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}
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bit_offset++;
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/* zero stuffing bits */
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if(bit_offset %8 == 0)
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return bit_offset;
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while(bit_offset %8 != 0){
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bit_offset++;
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}
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proto_tree_add_bits_item(tree, hf_mp4ves_stuffing, tvb, start_bit_offset, bit_offset-start_bit_offset, FALSE);
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return bit_offset;
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}
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/*
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video_signal_type() {
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video_signal_type
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if (video_signal_type) {
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video_format 3 uimsbf
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video_range 1 bslbf
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colour_description 1 bslbf
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if (colour_description) {
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colour_primaries 8 uimsbf
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transfer_characteristics 8 uimsbf
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matrix_coefficients 8 uimsbf
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}
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}
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}
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*/
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static int
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dissect_mp4ves_visual_object_type(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset)
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{
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guint8 video_signal_type, colour_description;
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video_signal_type = tvb_get_bits8(tvb,bit_offset,1);
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proto_tree_add_bits_item(tree, hf_mp4ves_video_signal_type, tvb, bit_offset, 1, FALSE);
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bit_offset++;
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if (video_signal_type) {
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/* video_format 3 bits */
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bit_offset+=3;
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/* video_range 1 bit */
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bit_offset++;
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/* colour_description 1 bit */
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colour_description = tvb_get_bits8(tvb,bit_offset,1);
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if (colour_description) {
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/* colour_primaries 8 bits */
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bit_offset+=8;
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/* transfer_characteristics 8 bits */
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bit_offset+=8;
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/* matrix_coefficients 8 bits*/
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bit_offset+=8;
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}
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}
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return bit_offset;
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}
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/*
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* 6.2.3 Video Object Layer
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*/
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/*
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* Table 6-12 -- Meaning of pixel aspect ratio
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*/
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static const value_string mp4ves_aspect_ratio_info_vals[] = {
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{ 0x0, "reserved" },
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{ 0x0, "Forbidden" },
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{ 0x1, "1:1 (Square)" },
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{ 0x2, "12:11 (625-type for 4:3 picture)" },
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{ 0x3, "10:11 (525-type for 4:3 picture)" },
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{ 0x4, "16:11 (625-type stretched for 16:9 picture)" },
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{ 0x5, "40:33 (525-type stretched for 16:9 picture)" },
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{ 0x6, "Reserved" },
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{ 0x7, "Reserved" },
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{ 0x8, "Reserved" },
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{ 0x9, "Reserved" },
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{ 0xa, "Reserved" },
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{ 0xb, "Reserved" },
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{ 0xc, "Reserved" },
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{ 0xd, "Reserved" },
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{ 0xe, "Reserved" },
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{ 0xf, "Extended PAR" },
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{ 0, NULL }
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};
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/* Table 6-14 Video Object Layer shape type */
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static const value_string mp4ves_video_object_layer_shape_vals[] = {
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{ 0x0, "rectangular" },
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{ 0x1, "binary" },
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{ 0x2, "binary only" },
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{ 0x3, "grayscale" },
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{ 0, NULL }
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};
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static int
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dissect_mp4ves_VideoObjectLayer(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int bit_offset)
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{
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guint32 dword;
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int current_bit_offset;
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guint8 octet, is_object_layer_identifier, aspect_ratio_info, vol_control_parameters, vbv_parameters;
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guint8 video_object_layer_shape, video_object_layer_verid = 0;
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/* if(next_bits() == video_object_layer_start_code) { */
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dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE);
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if (dword != 1){
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return bit_offset;
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}
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octet = tvb_get_bits8(tvb,bit_offset+24, 8);
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if((octet>=0x20)&&(octet<=0x2f)){
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/* Continue */
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}else{
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return bit_offset;
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}
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/* video_object_layer_start_code */
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proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE);
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bit_offset+=24;
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proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE);
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bit_offset+= 8;
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/* short_video_header = 0 */
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/* random_accessible_vol 1 */
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proto_tree_add_bits_item(tree, hf_mp4ves_random_accessible_vol, tvb, bit_offset, 1, FALSE);
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bit_offset++;
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/* video_object_type_indication 8 */
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proto_tree_add_bits_item(tree, hf_mp4ves_video_object_type_indication, tvb, bit_offset, 8, FALSE);
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bit_offset+= 8;
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/* is_object_layer_identifier 1 */
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is_object_layer_identifier = tvb_get_bits8(tvb,bit_offset, 1);
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proto_tree_add_bits_item(tree, hf_mp4ves_is_object_layer_identifier, tvb, bit_offset, 1, FALSE);
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bit_offset++;
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if(is_object_layer_identifier) {
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/* video_object_layer_verid 4 uimsbf */
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bit_offset+=4;
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/* video_object_layer_priority 3 uimsbf */
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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, FALSE);
|
|
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, FALSE);
|
|
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_text(tree, tvb, current_bit_offset>>3, (bit_offset+7)>>3, "Not dissected bits");
|
|
/* 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, FALSE);
|
|
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)
|
|
{
|
|
proto_item *item;
|
|
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, FALSE);
|
|
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, FALSE);
|
|
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, FALSE);
|
|
/*
|
|
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, FALSE);
|
|
}
|
|
if (visual_object_type == 1/*"Video ID"*/) {
|
|
/*
|
|
* video_object_start_code
|
|
*/
|
|
dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE);
|
|
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, FALSE);
|
|
bit_offset+=24;
|
|
proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE);
|
|
bit_offset+= 8;
|
|
if(tvb_length_remaining(tvb,(bit_offset>>3))==0){
|
|
item = proto_tree_add_text(tree, tvb, 0, -1, "Config string to short");
|
|
PROTO_ITEM_SET_GENERATED(item);
|
|
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, FALSE);
|
|
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, FALSE);
|
|
bit_offset+= 24;
|
|
|
|
proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE);
|
|
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, FALSE);
|
|
bit_offset+= 8;
|
|
|
|
/* while ( next_bits()== user_data_start_code){
|
|
user_data()
|
|
}
|
|
*/
|
|
dword = tvb_get_bits32(tvb,bit_offset, 32, FALSE);
|
|
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;
|
|
}
|
|
|
|
void
|
|
dissect_mp4ves_config(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *mp4ves_tree;
|
|
|
|
item = proto_tree_add_item(tree, hf_mp4ves_config, tvb, 0, -1, FALSE);
|
|
mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves_config);
|
|
|
|
dissect_mp4ves_VisualObjectSequence(tvb, pinfo, tree, 0);
|
|
}
|
|
|
|
void
|
|
dissect_mp4ves(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int bit_offset = 0;
|
|
proto_item *item;
|
|
proto_tree *mp4ves_tree;
|
|
guint32 dword;
|
|
|
|
/* Make entries in Protocol column and Info column on summary display */
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MP4V-ES");
|
|
if (tree) {
|
|
item = proto_tree_add_item(tree, proto_mp4ves, tvb, 0, -1, FALSE);
|
|
mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves);
|
|
/*
|
|
+------+------+------+------+
|
|
(a) | RTP | VS | VO | VOL |
|
|
|header|header|header|header|
|
|
+------+------+------+------+
|
|
|
|
+------+------+------+------+------------+
|
|
(b) | RTP | VS | VO | VOL |Video Packet|
|
|
|header|header|header|header| |
|
|
+------+------+------+------+------------+
|
|
|
|
+------+-----+------------------+
|
|
(c) | RTP | GOV |Video Object Plane|
|
|
|header| | |
|
|
+------+-----+------------------+
|
|
|
|
+------+------+------------+ +------+------+------------+
|
|
(d) | RTP | VOP |Video Packet| | RTP | VP |Video Packet|
|
|
|header|header| (1) | |header|header| (2) |
|
|
+------+------+------------+ +------+------+------------+
|
|
|
|
+------+------+------------+------+------------+------+------------+
|
|
(e) | RTP | VP |Video Packet| VP |Video Packet| VP |Video Packet|
|
|
|header|header| (1) |header| (2) |header| (3) |
|
|
+------+------+------------+------+------------+------+------------+
|
|
|
|
+------+------+------------+ +------+------------+
|
|
(f) | RTP | VOP |VOP fragment| | RTP |VOP fragment|
|
|
|header|header| (1) | |header| (2) | ___
|
|
+------+------+------------+ +------+------------+
|
|
|
|
Figure 2 - Examples of RTP packetized MPEG-4 Visual bitstream
|
|
|
|
So a valid packet should start with
|
|
VS - Visual Object Sequence Header
|
|
GOV - Group_of_VideoObjectPlane
|
|
VOP - Video Object Plane
|
|
VP - Video Plane
|
|
Otherwies it's a VOP fragment.
|
|
|
|
visual_object_sequence_start_code: The visual_object_sequence_start_code is
|
|
the bit string '000001B0' in hexadecimal. It initiates a visual session.
|
|
|
|
group_of_vop_start_code: The group_of_vop_start_code is the bit string '000001B3' in hexadecimal. It identifies
|
|
the beginning of a GOV header.
|
|
|
|
vop_start_code: This is the bit string '000001B6' in hexadecimal.
|
|
|
|
|
|
*/
|
|
if (tvb_length(tvb)< 4){
|
|
/* To short to be a start code */
|
|
proto_tree_add_text(tree, tvb, bit_offset>>3, -1, "Data");
|
|
return;
|
|
}
|
|
dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE);
|
|
if (dword != 1){
|
|
/* if it's not 23 zeros followed by 1 it isn't a start code */
|
|
proto_tree_add_text(tree, tvb, bit_offset>>3, -1, "Data");
|
|
return;
|
|
}
|
|
dword = tvb_get_bits8(tvb,24, 8);
|
|
bit_offset = bit_offset+8;
|
|
switch(dword){
|
|
/* vop_start_code */
|
|
case 0xb6:
|
|
proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE);
|
|
bit_offset = bit_offset+24;
|
|
/* vop_coding_type 2 bits */
|
|
proto_tree_add_bits_item(tree, hf_mp4ves_vop_coding_type, tvb, bit_offset, 2, FALSE);
|
|
break;
|
|
case 0xb0:
|
|
/* VS start code */
|
|
bit_offset = dissect_mp4ves_VisualObjectSequence(tvb, pinfo, tree, 0);
|
|
break;
|
|
default:
|
|
proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE);
|
|
bit_offset = bit_offset+24;
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
/*
|
|
* Parameter name profileAndLevel
|
|
* Parameter description This is a nonCollapsing GenericParameter
|
|
* Parameter identifier value 0
|
|
* Parameter status Mandatory
|
|
* Parameter type unsignedMax. Shall be in the range 0..255.
|
|
* H245:
|
|
* unsignedMax INTEGER(0..65535), -- Look for max
|
|
*/
|
|
static int
|
|
dissect_mp4ves_par_profile(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree _U_)
|
|
{
|
|
int offset = 0;
|
|
guint16 lvl;
|
|
const gchar *p = NULL;
|
|
asn1_ctx_t *actx;
|
|
|
|
actx = get_asn1_ctx(pinfo->private_data);
|
|
DISSECTOR_ASSERT(actx);
|
|
|
|
lvl = tvb_get_ntohs(tvb, offset);
|
|
p = match_strval(lvl, VALS(mp4ves_level_indication_vals));
|
|
if (p) {
|
|
proto_item_append_text(actx->created_item, " - profileAndLevel %s", p);
|
|
}
|
|
offset += 2;
|
|
return offset;
|
|
}
|
|
static int
|
|
dissect_mp4ves_par_video_object_type(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree _U_)
|
|
{
|
|
int offset = 0;
|
|
guint16 lvl;
|
|
const gchar *p = NULL;
|
|
asn1_ctx_t *actx;
|
|
|
|
actx = get_asn1_ctx(pinfo->private_data);
|
|
DISSECTOR_ASSERT(actx);
|
|
|
|
lvl = tvb_get_ntohs(tvb, offset);
|
|
p = match_strval(lvl, VALS(mp4ves_video_object_type_vals));
|
|
if (p) {
|
|
proto_item_append_text(actx->created_item, " - video_object_type %s", p);
|
|
}
|
|
offset += 2;
|
|
return offset;
|
|
}
|
|
|
|
static int
|
|
dissect_mp4ves_par_decoderConfigurationInformation(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree _U_)
|
|
{
|
|
asn1_ctx_t *actx;
|
|
|
|
actx = get_asn1_ctx(pinfo->private_data);
|
|
DISSECTOR_ASSERT(actx);
|
|
|
|
dissect_mp4ves_config(tvb, pinfo, tree);
|
|
|
|
return tvb_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 void
|
|
dissect_mp4ves_name(tvbuff_t *tvb _U_, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
asn1_ctx_t *actx;
|
|
mp4ves_capability_t *ftr = NULL;
|
|
|
|
actx = get_asn1_ctx(pinfo->private_data);
|
|
DISSECTOR_ASSERT(actx);
|
|
if (tree) {
|
|
ftr = find_cap(pinfo->match_string);
|
|
if (ftr) {
|
|
proto_item_append_text(actx->created_item, " - %s", ftr->name);
|
|
proto_item_append_text(proto_item_get_parent(proto_tree_get_parent(tree)), ": %s", ftr->name);
|
|
} else {
|
|
proto_item_append_text(actx->created_item, " - unknown(%s)", pinfo->match_string);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_mp4ves(void);
|
|
|
|
void
|
|
proto_register_mp4ves(void)
|
|
{
|
|
|
|
|
|
/* Setup list of header fields See Section 1.6.1 for details*/
|
|
static hf_register_info hf[] = {
|
|
{ &hf_mp4ves_config,
|
|
{ "Configuration", "mp4ves.configuration",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"Configuration", HFILL }
|
|
},
|
|
{ &hf_mp4ves_start_code_prefix,
|
|
{ "start code prefix", "mp4ves.start_code_prefix",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"start code prefix", HFILL }
|
|
},
|
|
{ &hf_mp4ves_start_code,
|
|
{ "Start code", "mp4ves.start_code",
|
|
FT_UINT8, BASE_RANGE_STRING|BASE_HEX, RVALS(&mp4ves_startcode_vals), 0x0,
|
|
"Start code", HFILL }
|
|
},
|
|
{ &hf_mp4ves_vop_coding_type,
|
|
{ "vop_coding_type", "mp4ves.vop_coding_type",
|
|
FT_UINT8, BASE_DEC, VALS(mp4ves_vop_coding_type_vals), 0x0,
|
|
"Start code", HFILL }
|
|
},
|
|
{&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,
|
|
"profile_and_level_indication", HFILL }
|
|
},
|
|
{ &hf_mp4ves_is_visual_object_identifier,
|
|
{ "visual_object_identifier", "mp4ves.visual_object_identifier",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"visual_object_identifier", HFILL }
|
|
},
|
|
{ &hf_mp4ves_visual_object_type,
|
|
{ "visual_object_type", "mp4ves.visual_object_type",
|
|
FT_UINT32, BASE_DEC, VALS(mp4ves_visual_object_type_vals), 0x0,
|
|
"visual_object_type", HFILL }
|
|
},
|
|
{ &hf_mp4ves_video_signal_type,
|
|
{ "video_signal_type", "mp4ves.video_signal_type",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"video_signal_type", HFILL }
|
|
},
|
|
{ &hf_mp4ves_stuffing,
|
|
{ "Stuffing", "mp4ves.stuffing",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Stuffing", 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,
|
|
"video_object_type_indication", 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,
|
|
"is_object_layer_identifier", HFILL }
|
|
},
|
|
{ &hf_mp4ves_aspect_ratio_info,
|
|
{ "aspect_ratio_info", "mp4ves.aspect_ratio_info",
|
|
FT_UINT8, BASE_DEC, VALS(mp4ves_aspect_ratio_info_vals), 0x0,
|
|
"aspect_ratio_info", HFILL }
|
|
},
|
|
{ &hf_mp4ves_vol_control_parameters,
|
|
{ "vol_control_parameters", "mp4ves.vol_control_parameters",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"vol_control_parameters", 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,
|
|
"video_object_layer_shape", HFILL }
|
|
},
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_mp4ves,
|
|
&ett_mp4ves_config,
|
|
};
|
|
|
|
module_t *mp4ves_module;
|
|
|
|
/* Register the protocol name and description */
|
|
proto_mp4ves = proto_register_protocol("MP4V-ES","MP4V-ES", "mp4v-es");
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_mp4ves, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
/* Register a configuration option for port */
|
|
|
|
register_dissector("mp4ves", dissect_mp4ves, proto_mp4ves);
|
|
|
|
/* Register a configuration option for port */
|
|
mp4ves_module = prefs_register_protocol(proto_mp4ves, proto_reg_handoff_mp4ves);
|
|
|
|
prefs_register_uint_preference(mp4ves_module,
|
|
"dynamic.payload.type",
|
|
"MP4V-ES dynamic payload type",
|
|
"The dynamic payload type which will be interpreted as MP4V-ES",
|
|
10,
|
|
&global_dynamic_payload_type);
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_mp4ves(void)
|
|
{
|
|
static dissector_handle_t mp4ves_handle;
|
|
static guint dynamic_payload_type;
|
|
static gboolean mp4ves_prefs_initialized = FALSE;
|
|
|
|
if (!mp4ves_prefs_initialized) {
|
|
dissector_handle_t mp4ves_name_handle;
|
|
mp4ves_capability_t *ftr;
|
|
|
|
mp4ves_handle = find_dissector("mp4ves");
|
|
dissector_add_string("rtp_dyn_payload_type","MP4V-ES", mp4ves_handle);
|
|
mp4ves_prefs_initialized = TRUE;
|
|
|
|
mp4ves_name_handle = create_dissector_handle(dissect_mp4ves_name, proto_mp4ves);
|
|
for (ftr=mp4ves_capability_tab; ftr->id; ftr++) {
|
|
if (ftr->name)
|
|
dissector_add_string("h245.gef.name", ftr->id, mp4ves_name_handle);
|
|
if (ftr->content_pdu)
|
|
dissector_add_string("h245.gef.content", ftr->id, new_create_dissector_handle(ftr->content_pdu, proto_mp4ves));
|
|
}
|
|
}else{
|
|
if ( dynamic_payload_type > 95 )
|
|
dissector_delete("rtp.pt", dynamic_payload_type, mp4ves_handle);
|
|
}
|
|
dynamic_payload_type = global_dynamic_payload_type;
|
|
|
|
if ( dynamic_payload_type > 95 ){
|
|
dissector_add("rtp.pt", dynamic_payload_type, mp4ves_handle);
|
|
}
|
|
}
|
|
|