From Michal Labedzki:

Add support for AVDTP/A2DP/VDP and SBC

Part of 
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7893

svn path=/trunk/; revision=45921

1 files changed, 348 insertions, 0 deletions

diff --git a/epan/dissectors/packet-sbc.c b/epan/dissectors/packet-sbc.c
new file mode 100644
index 0000000000..b279f79527
--- /dev/null
+++ b/epan/dissectors/packet-sbc.c
@@ -0,0 +1,348 @@
+/* packet-sbc.c
+ * Routines for Bluetooth SBC dissection
+ *
+ * Copyright 2012, Michal Labedzki for Tieto Corporation
+ *
+ * $Id$
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/expert.h>
+#include <epan/prefs.h>
+
+#define CHANNELS_MONO          0x00
+#define CHANNELS_JOINT_STEREO  0x03
+
+#define FREQUENCY_16000        0x00
+#define FREQUENCY_32000        0x01
+#define FREQUENCY_44100        0x02
+#define FREQUENCY_48000        0x03
+
+static int proto_sbc = -1;
+
+static int hf_sbc_fragmented                                               = -1;
+static int hf_sbc_starting_packet                                          = -1;
+static int hf_sbc_last_packet                                              = -1;
+static int hf_sbc_rfa                                                      = -1;
+static int hf_sbc_number_of_frames                                         = -1;
+
+static int hf_sbc_syncword                                                 = -1;
+static int hf_sbc_sampling_frequency                                       = -1;
+static int hf_sbc_blocks                                                   = -1;
+static int hf_sbc_channel_mode                                             = -1;
+static int hf_sbc_allocation_method                                        = -1;
+static int hf_sbc_subbands                                                 = -1;
+static int hf_sbc_bitpool                                                  = -1;
+static int hf_sbc_crc_check                                                = -1;
+
+static int hf_sbc_data                                                     = -1;
+
+static gint ett_sbc             = -1;
+static gint ett_sbc_list        = -1;
+
+static dissector_handle_t data_handle;
+
+extern value_string_ext media_codec_audio_type_vals_ext;
+
+static const value_string sampling_frequency_vals[] = {
+    { 0x00,  "16 kHz"},
+    { 0x01,  "32 kHz"},
+    { 0x02,  "44.1 kHz"},
+    { 0x03,  "48 kHz"},
+    { 0, NULL }
+};
+
+static const value_string blocks_vals[] = {
+    { 0x00,  "4"},
+    { 0x01,  "8"},
+    { 0x02,  "12"},
+    { 0x03,  "16"},
+    { 0, NULL }
+};
+
+static const value_string channel_mode_vals[] = {
+    { 0x00,  "Mono"},
+    { 0x01,  "Dual Channel"},
+    { 0x02,  "Stereo"},
+    { 0x03,  "Joint Stereo"},
+    { 0, NULL }
+};
+
+static const value_string allocation_method_vals[] = {
+    { 0x00,  "Loudness"},
+    { 0x01,  "SNR"},
+    { 0, NULL }
+};
+
+static const value_string subbands_vals[] = {
+    { 0x00,  "4"},
+    { 0x01,  "8"},
+    { 0, NULL }
+};
+
+
+static gint
+dissect_sbc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+    proto_item  *ti;
+    proto_tree  *sbc_tree;
+    proto_item  *pitem;
+    proto_item  *ritem;
+    proto_tree  *rtree;
+    gint        offset = 0;
+    guint8      number_of_frames;
+    guint8      syncword;
+    guint8      byte;
+    guint8      blocks;
+    guint8      channels;
+    guint8      subbands;
+    guint8      bitpool;
+    guint       frequency;
+    guint8      sbc_blocks;
+    gint        sbc_channels;
+    guint8      sbc_subbands;
+    gint        val;
+    gint        counter = 1;
+    gint        frame_length;
+    gint        expected_speed_data;
+
+    col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBC");
+
+    ti = proto_tree_add_item(tree, proto_sbc, tvb, offset, -1, ENC_NA);
+    sbc_tree = proto_item_add_subtree(ti, ett_sbc);
+
+    proto_tree_add_item(sbc_tree, hf_sbc_fragmented,       tvb, offset, 1, ENC_BIG_ENDIAN);
+    proto_tree_add_item(sbc_tree, hf_sbc_starting_packet,  tvb, offset, 1, ENC_BIG_ENDIAN);
+    proto_tree_add_item(sbc_tree, hf_sbc_last_packet,      tvb, offset, 1, ENC_BIG_ENDIAN);
+    proto_tree_add_item(sbc_tree, hf_sbc_rfa,              tvb, offset, 1, ENC_BIG_ENDIAN);
+    proto_tree_add_item(sbc_tree, hf_sbc_number_of_frames, tvb, offset, 1, ENC_BIG_ENDIAN);
+    number_of_frames = tvb_get_guint8(tvb, offset) & 0x0F;
+    offset += 1;
+
+    while (tvb_length_remaining(tvb, offset)) {
+        byte = tvb_get_guint8(tvb, offset + 1);
+        frequency = (byte & 0xC0) >> 6;
+        blocks = (byte & 0x30) >> 4;
+        channels = (byte & 0x0C)>> 2;
+        subbands = byte & 0x01;
+
+        bitpool = tvb_get_guint8(tvb, offset + 2);
+
+        if (channels == CHANNELS_MONO)
+            sbc_channels = 1;
+        else
+            sbc_channels = 2;
+
+        switch (frequency) {
+            case FREQUENCY_16000:
+                frequency = 16000;
+                break;
+            case FREQUENCY_32000:
+                frequency = 32000;
+                break;
+            case FREQUENCY_44100:
+                frequency = 44100;
+                break;
+            case FREQUENCY_48000:
+                frequency = 48000;
+                break;
+            default:
+                frequency = 0;
+        }
+
+        sbc_subbands = 4 * (subbands + 1);
+        sbc_blocks = 4 * (blocks + 1);
+
+        frame_length = (4 * sbc_subbands * sbc_channels) / 8;
+        if (sbc_channels == 1)
+            val = sbc_blocks * sbc_channels * bitpool;
+        else
+            val = (((channels == CHANNELS_JOINT_STEREO) ? 1 : 0) * sbc_subbands + sbc_blocks * bitpool);
+
+        frame_length += val / 8;
+        if (val % 8)
+            frame_length += 1;
+
+        expected_speed_data = (frame_length * frequency) / (sbc_subbands * sbc_blocks);
+
+        ritem = proto_tree_add_text(sbc_tree, tvb, offset, 4 + frame_length,
+                "Frame: %3u/%3u", counter, number_of_frames);
+        rtree = proto_item_add_subtree(ritem, ett_sbc_list);
+
+        pitem = proto_tree_add_item(rtree, hf_sbc_syncword, tvb, offset, 1, ENC_BIG_ENDIAN);
+        syncword = tvb_get_guint8(tvb, offset);
+        if (syncword != 0x9C) {
+            expert_add_info_format(pinfo, pitem, PI_PROTOCOL, PI_WARN,
+                    "Unexpected syncword");
+        }
+        offset += 1;
+
+        proto_tree_add_item(ritem, hf_sbc_sampling_frequency, tvb, offset, 1, ENC_BIG_ENDIAN);
+        proto_tree_add_item(ritem, hf_sbc_blocks,             tvb, offset, 1, ENC_BIG_ENDIAN);
+        proto_tree_add_item(ritem, hf_sbc_channel_mode,       tvb, offset, 1, ENC_BIG_ENDIAN);
+        proto_tree_add_item(ritem, hf_sbc_allocation_method,  tvb, offset, 1, ENC_BIG_ENDIAN);
+        proto_tree_add_item(ritem, hf_sbc_subbands,           tvb, offset, 1, ENC_BIG_ENDIAN);
+        offset += 1;
+
+        proto_tree_add_item(ritem, hf_sbc_bitpool,            tvb, offset, 1, ENC_BIG_ENDIAN);
+        offset += 1;
+
+        proto_tree_add_item(ritem, hf_sbc_crc_check,          tvb, offset, 1, ENC_BIG_ENDIAN);
+        offset += 1;
+
+        proto_tree_add_item(ritem, hf_sbc_data,  tvb, offset, frame_length, ENC_BIG_ENDIAN);
+        offset += frame_length;
+
+/* TODO: expert_info for invalid CRC*/
+
+        pitem = proto_tree_add_text(ritem, tvb, offset, 0, "Expected speed data: %u KiB/s", expected_speed_data / 1024);
+        PROTO_ITEM_SET_GENERATED(pitem);
+
+        counter += 1;
+    }
+
+/* TODO: more precise dissection: blocks, channels, subbands, padding  */
+
+    col_append_fstr(pinfo->cinfo, COL_INFO, " Frames=%u", number_of_frames);
+
+    return offset;
+}
+
+void
+proto_register_sbc(void)
+{
+    module_t *module;
+
+    static hf_register_info hf[] = {
+        { &hf_sbc_fragmented,
+            { "Fragmented",                      "sbc.fragmented",
+            FT_BOOLEAN, 8, NULL, 0x80,
+            NULL, HFILL }
+        },
+        { &hf_sbc_starting_packet,
+            { "Starting Packet",                 "sbc.starting_packet",
+            FT_BOOLEAN, 8, NULL, 0x40,
+            NULL, HFILL }
+        },
+        { &hf_sbc_last_packet,
+            { "Last Packet",                     "sbc.last_packet",
+            FT_BOOLEAN, 8, NULL, 0x20,
+            NULL, HFILL }
+        },
+        { &hf_sbc_rfa,
+            { "RFA",                             "sbc.rfa",
+            FT_BOOLEAN, 8, NULL, 0x10,
+            NULL, HFILL }
+        },
+        { &hf_sbc_number_of_frames,
+            { "Number of Frames",                "sbc.number_of_frames",
+            FT_UINT8, BASE_DEC, NULL, 0x0F,
+            NULL, HFILL }
+        },
+        { &hf_sbc_syncword,
+            { "Sync Word",                       "sbc.syncword",
+            FT_UINT8, BASE_HEX, NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_sbc_sampling_frequency,
+            { "Sampling Frequency",              "sbc.sampling_frequency",
+            FT_UINT8, BASE_HEX, VALS(sampling_frequency_vals), 0xC0,
+            NULL, HFILL }
+        },
+        { &hf_sbc_blocks,
+            { "Blocks",                          "sbc.blocks",
+            FT_UINT8, BASE_HEX, VALS(blocks_vals), 0x30,
+            NULL, HFILL }
+        },
+        { &hf_sbc_channel_mode,
+            { "Channel Mode",                    "sbc.channel_mode",
+            FT_UINT8, BASE_HEX, VALS(channel_mode_vals), 0x0C,
+            NULL, HFILL }
+        },
+        { &hf_sbc_allocation_method,
+            { "Allocation Method",               "sbc.allocation_method",
+            FT_UINT8, BASE_HEX, VALS(allocation_method_vals), 0x02,
+            NULL, HFILL }
+        },
+        { &hf_sbc_subbands,
+            { "Subbands",                        "sbc.subbands",
+            FT_UINT8, BASE_HEX, VALS(subbands_vals), 0x01,
+            NULL, HFILL }
+        },
+        { &hf_sbc_bitpool,
+            { "Bitpool",                         "sbc.bitpool",
+            FT_UINT8, BASE_DEC, NULL, 0x00,
+            NULL, HFILL }
+        },
+        { &hf_sbc_crc_check,
+            { "CRC Check",                       "sbc.crc_check",
+            FT_UINT8, BASE_HEX, NULL, 0x00,
+            NULL, HFILL }
+        },
+
+        { &hf_sbc_data,
+            { "Data",                            "sbc.data",
+            FT_NONE, BASE_NONE, NULL, 0x00,
+            NULL, HFILL }
+        },
+    };
+
+    static gint *ett[] = {
+        &ett_sbc,
+        &ett_sbc_list,
+    };
+
+    proto_sbc = proto_register_protocol("Bluetooth SBC Codec", "SBC", "sbc");
+
+    proto_register_field_array(proto_sbc, hf, array_length(hf));
+    proto_register_subtree_array(ett, array_length(ett));
+
+    new_register_dissector("sbc", dissect_sbc, proto_sbc);
+
+    module = prefs_register_protocol(proto_sbc, NULL);
+    prefs_register_static_text_preference(module, "a2dp.version",
+            "Bluetooth Audio Codec SBC version based on A2DP 1.3",
+            "Version of codec supported by this dissector.");
+}
+
+void
+proto_reg_handoff_sbc(void)
+{
+    dissector_handle_t sbc_handle;
+
+    sbc_handle = find_dissector("sbc");
+    data_handle   = find_dissector("data");
+}
+
+/*
+ * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */