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-rw-r--r--epan/dissectors/packet-mp4ves.c301
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diff --git a/epan/dissectors/packet-mp4ves.c b/epan/dissectors/packet-mp4ves.c
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+++ b/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>
+ *
+ * $Id$
+ *
+ * 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
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-30 15:29:56 +0000