A basic mp4v-es dissector.
svn path=/trunk/; revision=25427
This commit is contained in:
Anders Broman
parent
f6ab1892e6
commit
8b2750fbad
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@ -546,6 +546,7 @@ CLEAN_DISSECTOR_SRC = \
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packet-mmse.c \
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packet-mount.c \
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packet-mp2t.c \
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packet-mp4ves.c \
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packet-mpeg1.c \
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packet-mpls.c \
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packet-mpls-echo.c \
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@ -0,0 +1,301 @@
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/*
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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 "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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/* 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 dynamic_payload_type = 0;
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static guint temp_dynamic_payload_type = 0;
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static const range_string mp4ves_startcode_vals[] = {
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{ 0, 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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#if 0
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To be called from packet-sdp.c
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void
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dissect_mp4ves_config(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *item;
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proto_tree *mp4ves_tree;
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int bit_offset = 0;
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guint32 dword;
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item = proto_tree_add_item(tree, hf_mp4ves_config, tvb, 0, -1, FALSE);
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mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves_config);
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/* Get start code prefix */
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dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE);
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if (dword == 1){
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}else{
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/* No start code prefix */
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return;
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}
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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 = bit_offset+24;
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/* We are byte aligned no stuffing */
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dword = tvb_get_bits8(tvb,bit_offset, 8);
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proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE);
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}
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#endif
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void
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dissect_mp4ves(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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int bit_offset = 0;
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proto_item *item;
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proto_tree *mp4ves_tree;
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guint32 dword;
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/* Make entries in Protocol column and Info column on summary display */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MP4V-ES");
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if (tree) {
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item = proto_tree_add_item(tree, proto_mp4ves, tvb, 0, -1, FALSE);
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mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves);
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/*
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+------+------+------+------+
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(a) | RTP | VS | VO | VOL |
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|header|header|header|header|
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+------+------+------+------+
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+------+------+------+------+------------+
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(b) | RTP | VS | VO | VOL |Video Packet|
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|header|header|header|header| |
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+------+------+------+------+------------+
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+------+-----+------------------+
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(c) | RTP | GOV |Video Object Plane|
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|header| | |
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+------+-----+------------------+
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+------+------+------------+ +------+------+------------+
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(d) | RTP | VOP |Video Packet| | RTP | VP |Video Packet|
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|header|header| (1) | |header|header| (2) |
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+------+------+------------+ +------+------+------------+
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+------+------+------------+------+------------+------+------------+
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(e) | RTP | VP |Video Packet| VP |Video Packet| VP |Video Packet|
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|header|header| (1) |header| (2) |header| (3) |
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+------+------+------------+------+------------+------+------------+
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+------+------+------------+ +------+------------+
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(f) | RTP | VOP |VOP fragment| | RTP |VOP fragment|
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|header|header| (1) | |header| (2) | ___
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+------+------+------------+ +------+------------+
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Figure 2 - Examples of RTP packetized MPEG-4 Visual bitstream
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So a valid packet should start with
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VS - Visual Object Sequence Header
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GOV - Group_of_VideoObjectPlane
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VOP - Video Object Plane
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VP - Video Plane
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Otherwies it's a VOP fragment.
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visual_object_sequence_start_code: The visual_object_sequence_start_code is
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the bit string ‘000001B0’ in hexadecimal. It initiates a visual session.
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group_of_vop_start_code: The group_of_vop_start_code is the bit string ‘000001B3’ in hexadecimal. It identifies
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the beginning of a GOV header.
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vop_start_code: This is the bit string ‘000001B6’ in hexadecimal.
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*/
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dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE);
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if (dword != 1){
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/* if it's not 23 zeros followed by 1 it isn't a start code */
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proto_tree_add_text(tree, tvb, bit_offset>>3, -1, "Data");
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return;
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}
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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 = bit_offset+24;
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dword = tvb_get_bits8(tvb,bit_offset, 8);
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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 = bit_offset+8;
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switch(dword){
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/* vop_start_code */
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case 0xb6:
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/* vop_coding_type 2 bits */
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proto_tree_add_bits_item(tree, hf_mp4ves_vop_coding_type, tvb, bit_offset, 2, FALSE);
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break;
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default:
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break;
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}
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}
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}
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void
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proto_reg_handoff_mp4ves(void)
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{
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dissector_handle_t mp4ves_handle;
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static int mp4ves_prefs_initialized = FALSE;
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mp4ves_handle = create_dissector_handle(dissect_mp4ves, proto_mp4ves);
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if (!mp4ves_prefs_initialized) {
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mp4ves_prefs_initialized = TRUE;
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}else{
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if ( dynamic_payload_type > 95 )
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dissector_delete("rtp.pt", dynamic_payload_type, mp4ves_handle);
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}
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dynamic_payload_type = temp_dynamic_payload_type;
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if ( dynamic_payload_type > 95 ){
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dissector_add("rtp.pt", dynamic_payload_type, mp4ves_handle);
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}
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dissector_add_string("rtp_dyn_payload_type","MP4V-ES", mp4ves_handle);
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}
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void
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proto_register_mp4ves(void)
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{
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_mp4ves_config,
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{ "Configuration", "mp4ves.configuration",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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"Configuration", HFILL }
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},
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{ &hf_mp4ves_start_code_prefix,
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{ "start code prefix", "mp4ves.start_code_prefix",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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"start code prefix", HFILL }
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},
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{ &hf_mp4ves_start_code,
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{ "Start code", "mp4ves.start_code",
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FT_UINT32, BASE_HEX, RVALS(&mp4ves_startcode_vals), 0x0,
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"Start code", HFILL }
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},
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{ &hf_mp4ves_vop_coding_type,
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{ "vop_coding_type", "mp4ves.vop_coding_type",
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FT_UINT8, BASE_DEC, VALS(mp4ves_vop_coding_type_vals), 0x0,
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"Start code", HFILL }
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},
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_mp4ves,
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&ett_mp4ves_config,
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};
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module_t *mp4ves_module;
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/* Register the protocol name and description */
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proto_mp4ves = proto_register_protocol("MP4V-ES","MP4V-ES", "mp4v-es");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_mp4ves, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register a configuration option for port */
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register_dissector("mp4ves", dissect_mp4ves, proto_mp4ves);
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/* Register a configuration option for port */
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mp4ves_module = prefs_register_protocol(proto_mp4ves, proto_reg_handoff_mp4ves);
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prefs_register_uint_preference(mp4ves_module, "dynamic.payload.type",
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"MP4V-ES dynamic payload type",
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"The dynamic payload type which will be interpreted as MP4V-ES",
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10,
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&temp_dynamic_payload_type);
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}
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