diff options
author | Anders Broman <anders.broman@ericsson.com> | 2012-11-05 11:42:10 +0000 |
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committer | Anders Broman <anders.broman@ericsson.com> | 2012-11-05 11:42:10 +0000 |
commit | 892ff116c97cb48bcf19e1972f65b912168f0abf (patch) | |
tree | d420f5534f84e24602e64c35c4cddfd239aea964 /epan/dissectors/packet-sbc.c | |
parent | 45953625a5c9238300ef706aa8b816b935b4621f (diff) |
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
Diffstat (limited to 'epan/dissectors/packet-sbc.c')
-rw-r--r-- | epan/dissectors/packet-sbc.c | 348 |
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: + */ |