diff options
author | Anders Broman <anders.broman@ericsson.com> | 2008-06-04 20:34:42 +0000 |
---|---|---|
committer | Anders Broman <anders.broman@ericsson.com> | 2008-06-04 20:34:42 +0000 |
commit | 8b2750fbadb006f856d216f92b26781318a706fc (patch) | |
tree | 9fafe5f17d5f827d13688d7a7688f17ff366332a /epan/dissectors/packet-mp4ves.c | |
parent | f6ab1892e69b00964a1760c9a29767ac604e91a6 (diff) |
A basic mp4v-es dissector.
svn path=/trunk/; revision=25427
Diffstat (limited to 'epan/dissectors/packet-mp4ves.c')
-rw-r--r-- | epan/dissectors/packet-mp4ves.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/epan/dissectors/packet-mp4ves.c b/epan/dissectors/packet-mp4ves.c new file mode 100644 index 0000000000..0e3c991723 --- /dev/null +++ b/epan/dissectors/packet-mp4ves.c @@ -0,0 +1,301 @@ +/* + * packet-mp4ves.c + * Routines for MPEG4 dissection + * Copyright 2007-2008, Anders Broman <anders.broman[at]ericsson.com> + * + * $Id$ + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * References: + * http://www.ietf.org/rfc/rfc3016.txt?number=3016 + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <glib.h> + +#include <epan/packet.h> +#include <epan/proto.h> + +#include "prefs.h" + +/* 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; + +/* Initialize the subtree pointers */ +static int ett_mp4ves = -1; +static int ett_mp4ves_config = -1; + +/* The dynamic payload type which will be dissected as MP4V-ES */ + +static guint dynamic_payload_type = 0; +static guint temp_dynamic_payload_type = 0; + + +static const range_string mp4ves_startcode_vals[] = { + { 0, 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 } +}; + + +#if 0 +To be called from packet-sdp.c +void +dissect_mp4ves_config(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + proto_item *item; + proto_tree *mp4ves_tree; + int bit_offset = 0; + guint32 dword; + + item = proto_tree_add_item(tree, hf_mp4ves_config, tvb, 0, -1, FALSE); + mp4ves_tree = proto_item_add_subtree(item, ett_mp4ves_config); + + /* Get start code prefix */ + dword = tvb_get_bits32(tvb,bit_offset, 24, FALSE); + if (dword == 1){ + + }else{ + /* No start code prefix */ + return; + } + + proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE); + bit_offset = bit_offset+24; + + /* We are byte aligned no stuffing */ + dword = tvb_get_bits8(tvb,bit_offset, 8); + proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE); + + +} +#endif + +void +dissect_mp4ves(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + int offset = 0; + 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. + + + */ + 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; + } + proto_tree_add_bits_item(tree, hf_mp4ves_start_code_prefix, tvb, bit_offset, 24, FALSE); + bit_offset = bit_offset+24; + dword = tvb_get_bits8(tvb,bit_offset, 8); + proto_tree_add_bits_item(tree, hf_mp4ves_start_code, tvb, bit_offset, 8, FALSE); + bit_offset = bit_offset+8; + switch(dword){ + /* vop_start_code */ + case 0xb6: + /* vop_coding_type 2 bits */ + proto_tree_add_bits_item(tree, hf_mp4ves_vop_coding_type, tvb, bit_offset, 2, FALSE); + break; + default: + break; + } + } + +} + +void +proto_reg_handoff_mp4ves(void) +{ + dissector_handle_t mp4ves_handle; + static int mp4ves_prefs_initialized = FALSE; + + mp4ves_handle = create_dissector_handle(dissect_mp4ves, proto_mp4ves); + + if (!mp4ves_prefs_initialized) { + mp4ves_prefs_initialized = TRUE; + }else{ + if ( dynamic_payload_type > 95 ) + dissector_delete("rtp.pt", dynamic_payload_type, mp4ves_handle); + } + dynamic_payload_type = temp_dynamic_payload_type; + + if ( dynamic_payload_type > 95 ){ + dissector_add("rtp.pt", dynamic_payload_type, mp4ves_handle); + } + + dissector_add_string("rtp_dyn_payload_type","MP4V-ES", mp4ves_handle); + +} + +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_UINT32, 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 } + }, + }; + +/* 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, + &temp_dynamic_payload_type); + +}
\ No newline at end of file |