2012-11-05 11:42:10 +00:00
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/* packet-sbc.c
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* Routines for Bluetooth SBC dissection
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*
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* Copyright 2012, Michal Labedzki for Tieto Corporation
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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#define CHANNELS_MONO 0x00
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#define CHANNELS_JOINT_STEREO 0x03
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#define FREQUENCY_16000 0x00
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#define FREQUENCY_32000 0x01
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#define FREQUENCY_44100 0x02
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#define FREQUENCY_48000 0x03
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static int proto_sbc = -1;
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static int hf_sbc_fragmented = -1;
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static int hf_sbc_starting_packet = -1;
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static int hf_sbc_last_packet = -1;
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static int hf_sbc_rfa = -1;
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static int hf_sbc_number_of_frames = -1;
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static int hf_sbc_syncword = -1;
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static int hf_sbc_sampling_frequency = -1;
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static int hf_sbc_blocks = -1;
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static int hf_sbc_channel_mode = -1;
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static int hf_sbc_allocation_method = -1;
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static int hf_sbc_subbands = -1;
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static int hf_sbc_bitpool = -1;
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static int hf_sbc_crc_check = -1;
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static int hf_sbc_data = -1;
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static gint ett_sbc = -1;
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static gint ett_sbc_list = -1;
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2013-05-27 23:21:11 +00:00
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static expert_field ei_sbc_syncword = EI_INIT;
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2012-11-05 11:42:10 +00:00
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static dissector_handle_t data_handle;
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extern value_string_ext media_codec_audio_type_vals_ext;
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static const value_string sampling_frequency_vals[] = {
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{ 0x00, "16 kHz"},
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{ 0x01, "32 kHz"},
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{ 0x02, "44.1 kHz"},
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{ 0x03, "48 kHz"},
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{ 0, NULL }
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};
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static const value_string blocks_vals[] = {
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{ 0x00, "4"},
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{ 0x01, "8"},
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{ 0x02, "12"},
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{ 0x03, "16"},
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{ 0, NULL }
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};
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static const value_string channel_mode_vals[] = {
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{ 0x00, "Mono"},
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{ 0x01, "Dual Channel"},
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{ 0x02, "Stereo"},
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{ 0x03, "Joint Stereo"},
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{ 0, NULL }
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};
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static const value_string allocation_method_vals[] = {
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{ 0x00, "Loudness"},
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{ 0x01, "SNR"},
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{ 0, NULL }
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};
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static const value_string subbands_vals[] = {
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{ 0x00, "4"},
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{ 0x01, "8"},
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{ 0, NULL }
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};
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static gint
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dissect_sbc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_item *ti;
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proto_tree *sbc_tree;
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proto_item *pitem;
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proto_item *ritem;
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proto_tree *rtree;
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gint offset = 0;
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guint8 number_of_frames;
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guint8 syncword;
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guint8 byte;
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guint8 blocks;
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guint8 channels;
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guint8 subbands;
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guint8 bitpool;
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guint frequency;
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guint8 sbc_blocks;
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gint sbc_channels;
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guint8 sbc_subbands;
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gint val;
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gint counter = 1;
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gint frame_length;
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gint expected_speed_data;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SBC");
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ti = proto_tree_add_item(tree, proto_sbc, tvb, offset, -1, ENC_NA);
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sbc_tree = proto_item_add_subtree(ti, ett_sbc);
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proto_tree_add_item(sbc_tree, hf_sbc_fragmented, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(sbc_tree, hf_sbc_starting_packet, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(sbc_tree, hf_sbc_last_packet, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(sbc_tree, hf_sbc_rfa, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(sbc_tree, hf_sbc_number_of_frames, tvb, offset, 1, ENC_BIG_ENDIAN);
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number_of_frames = tvb_get_guint8(tvb, offset) & 0x0F;
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offset += 1;
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2013-04-02 21:13:02 +00:00
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while (tvb_length_remaining(tvb, offset) > 0) {
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2012-11-05 11:42:10 +00:00
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byte = tvb_get_guint8(tvb, offset + 1);
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frequency = (byte & 0xC0) >> 6;
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blocks = (byte & 0x30) >> 4;
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channels = (byte & 0x0C)>> 2;
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subbands = byte & 0x01;
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bitpool = tvb_get_guint8(tvb, offset + 2);
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if (channels == CHANNELS_MONO)
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sbc_channels = 1;
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else
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sbc_channels = 2;
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switch (frequency) {
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case FREQUENCY_16000:
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frequency = 16000;
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break;
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case FREQUENCY_32000:
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frequency = 32000;
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break;
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case FREQUENCY_44100:
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frequency = 44100;
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break;
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case FREQUENCY_48000:
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frequency = 48000;
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break;
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default:
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frequency = 0;
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}
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sbc_subbands = 4 * (subbands + 1);
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sbc_blocks = 4 * (blocks + 1);
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frame_length = (4 * sbc_subbands * sbc_channels) / 8;
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if (sbc_channels == 1)
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val = sbc_blocks * sbc_channels * bitpool;
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else
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val = (((channels == CHANNELS_JOINT_STEREO) ? 1 : 0) * sbc_subbands + sbc_blocks * bitpool);
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frame_length += val / 8;
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if (val % 8)
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frame_length += 1;
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expected_speed_data = (frame_length * frequency) / (sbc_subbands * sbc_blocks);
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ritem = proto_tree_add_text(sbc_tree, tvb, offset, 4 + frame_length,
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"Frame: %3u/%3u", counter, number_of_frames);
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rtree = proto_item_add_subtree(ritem, ett_sbc_list);
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pitem = proto_tree_add_item(rtree, hf_sbc_syncword, tvb, offset, 1, ENC_BIG_ENDIAN);
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syncword = tvb_get_guint8(tvb, offset);
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if (syncword != 0x9C) {
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2013-05-27 23:21:11 +00:00
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expert_add_info(pinfo, pitem, &ei_sbc_syncword);
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2012-11-05 11:42:10 +00:00
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}
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offset += 1;
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proto_tree_add_item(ritem, hf_sbc_sampling_frequency, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(ritem, hf_sbc_blocks, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(ritem, hf_sbc_channel_mode, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(ritem, hf_sbc_allocation_method, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(ritem, hf_sbc_subbands, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(ritem, hf_sbc_bitpool, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(ritem, hf_sbc_crc_check, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(ritem, hf_sbc_data, tvb, offset, frame_length, ENC_BIG_ENDIAN);
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offset += frame_length;
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/* TODO: expert_info for invalid CRC*/
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pitem = proto_tree_add_text(ritem, tvb, offset, 0, "Expected speed data: %u KiB/s", expected_speed_data / 1024);
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PROTO_ITEM_SET_GENERATED(pitem);
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counter += 1;
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}
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/* TODO: more precise dissection: blocks, channels, subbands, padding */
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col_append_fstr(pinfo->cinfo, COL_INFO, " Frames=%u", number_of_frames);
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return offset;
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}
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void
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proto_register_sbc(void)
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{
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module_t *module;
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2013-05-27 23:21:11 +00:00
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expert_module_t* expert_sbc;
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2012-11-05 11:42:10 +00:00
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static hf_register_info hf[] = {
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{ &hf_sbc_fragmented,
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{ "Fragmented", "sbc.fragmented",
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FT_BOOLEAN, 8, NULL, 0x80,
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NULL, HFILL }
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},
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{ &hf_sbc_starting_packet,
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{ "Starting Packet", "sbc.starting_packet",
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FT_BOOLEAN, 8, NULL, 0x40,
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NULL, HFILL }
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},
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{ &hf_sbc_last_packet,
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{ "Last Packet", "sbc.last_packet",
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FT_BOOLEAN, 8, NULL, 0x20,
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NULL, HFILL }
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},
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{ &hf_sbc_rfa,
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{ "RFA", "sbc.rfa",
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FT_BOOLEAN, 8, NULL, 0x10,
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NULL, HFILL }
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},
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{ &hf_sbc_number_of_frames,
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{ "Number of Frames", "sbc.number_of_frames",
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FT_UINT8, BASE_DEC, NULL, 0x0F,
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NULL, HFILL }
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},
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{ &hf_sbc_syncword,
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{ "Sync Word", "sbc.syncword",
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FT_UINT8, BASE_HEX, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_sbc_sampling_frequency,
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{ "Sampling Frequency", "sbc.sampling_frequency",
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FT_UINT8, BASE_HEX, VALS(sampling_frequency_vals), 0xC0,
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NULL, HFILL }
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},
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{ &hf_sbc_blocks,
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{ "Blocks", "sbc.blocks",
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FT_UINT8, BASE_HEX, VALS(blocks_vals), 0x30,
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NULL, HFILL }
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},
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{ &hf_sbc_channel_mode,
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{ "Channel Mode", "sbc.channel_mode",
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FT_UINT8, BASE_HEX, VALS(channel_mode_vals), 0x0C,
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NULL, HFILL }
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},
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{ &hf_sbc_allocation_method,
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{ "Allocation Method", "sbc.allocation_method",
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FT_UINT8, BASE_HEX, VALS(allocation_method_vals), 0x02,
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NULL, HFILL }
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},
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{ &hf_sbc_subbands,
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{ "Subbands", "sbc.subbands",
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FT_UINT8, BASE_HEX, VALS(subbands_vals), 0x01,
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NULL, HFILL }
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},
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{ &hf_sbc_bitpool,
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{ "Bitpool", "sbc.bitpool",
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FT_UINT8, BASE_DEC, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_sbc_crc_check,
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{ "CRC Check", "sbc.crc_check",
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FT_UINT8, BASE_HEX, NULL, 0x00,
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NULL, HFILL }
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},
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{ &hf_sbc_data,
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{ "Data", "sbc.data",
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FT_NONE, BASE_NONE, NULL, 0x00,
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NULL, HFILL }
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},
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};
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static gint *ett[] = {
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&ett_sbc,
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&ett_sbc_list,
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};
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2013-05-27 23:21:11 +00:00
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static ei_register_info ei[] = {
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{ &ei_sbc_syncword, { "sbc.syncword.unexpected", PI_PROTOCOL, PI_WARN, "Unexpected syncword", EXPFILL }},
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};
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2012-11-05 11:42:10 +00:00
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proto_sbc = proto_register_protocol("Bluetooth SBC Codec", "SBC", "sbc");
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proto_register_field_array(proto_sbc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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2013-05-27 23:21:11 +00:00
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expert_sbc = expert_register_protocol(proto_sbc);
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expert_register_field_array(expert_sbc, ei, array_length(ei));
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2012-11-05 11:42:10 +00:00
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new_register_dissector("sbc", dissect_sbc, proto_sbc);
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module = prefs_register_protocol(proto_sbc, NULL);
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prefs_register_static_text_preference(module, "a2dp.version",
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"Bluetooth Audio Codec SBC version based on A2DP 1.3",
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"Version of codec supported by this dissector.");
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}
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void
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proto_reg_handoff_sbc(void)
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{
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data_handle = find_dissector("data");
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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