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# Copyright 2023 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
# This file contains Emboss packet definitions for extensions to the Bluetooth
# Host-Controller interface. These extensions are not standardized through the
# Bluetooth SIG.
#
# NOTE: The definitions below are incomplete. They get added as needed.
# This list will grow as we support more vendor features.
import "hci_common.emb" as hci
[$default byte_order: "LittleEndian"]
[(cpp) namespace: "pw::bluetooth::vendor::android_hci"]
# ========================= HCI packet headers ==========================
struct AndroidCommandHeader:
-- HCI Vendor Command packet header.
let hdr_size = hci.CommandHeader.$size_in_bytes
0 [+hdr_size] hci.CommandHeader header
$next [+1] UInt sub_opcode
# ======================= Android HCI extensions ========================
# Documentation: https://source.android.com/devices/bluetooth/hci_requirements
enum Capability:
[maximum_bits: 8]
NOT_CAPABLE = 0x00
CAPABLE = 0x01
bits AudioCodecSupportMask:
0 [+1] Flag sbc
1 [+1] Flag aac
2 [+1] Flag aptx
3 [+1] Flag aptx_hd
4 [+1] Flag ldac
enum A2dpCodecType:
[maximum_bits: 8]
SBC = 0x01
AAC = 0x02
APTX = 0x04
APTX_HD = 0x08
LDAC = 0x10
struct A2dpScmsTEnable:
0 [+1] hci.GenericEnableParam enabled
$next [+1] UInt header
enum A2dpSamplingFrequency:
[maximum_bits: 8]
HZ_44100 = 0x01
HZ_48000 = 0x02
HZ_88200 = 0x04
HZ_96000 = 0x08
enum A2dpBitsPerSample:
[maximum_bits: 8]
BITS_PER_SAMPLE_16 = 0x01
BITS_PER_SAMPLE_24 = 0x02
BITS_PER_SAMPLE_32 = 0x04
enum A2dpChannelMode:
[maximum_bits: 8]
MONO = 0x01
STEREO = 0x02
enum SbcSamplingFrequency:
[maximum_bits: 4]
HZ_48000 = 0x01
HZ_44100 = 0x02
HZ_32000 = 0x04
HZ_16000 = 0x08
enum SbcChannelMode:
[maximum_bits: 4]
JOINT_STEREO = 0x01
STEREO = 0x02
DUAL_CHANNEL = 0x04
MONO = 0x08
enum SbcBlockLen:
[maximum_bits: 4]
BLOCK_LEN_16 = 0x01
BLOCK_LEN_12 = 0x02
BLOCK_LEN_8 = 0x04
BLOCK_LEN_4 = 0x08
enum SbcSubBands:
[maximum_bits: 2]
SUBBANDS_8 = 0x01
SUBBANDS_4 = 0x02
enum SbcAllocationMethod:
[maximum_bits: 2]
LOUNDNESS = 0x01
SNR = 0x02
enum AacEnableVariableBitRate:
-- 1-octet boolean "enable"/"disable" parameter for AAC variable bitrate
[maximum_bits: 8]
DISABLE = 0x00
ENABLE = 0x80
enum LdacBitrateIndex:
-- Values 0x03 - 0x7E are reserved
-- Values 0x80 - 0xFF are reserved
[maximum_bits: 8]
HIGH = 0x00
MID = 0x01
LOW = 0x02
ADAPTIVE_BITRATE = 0x7F
bits LdacChannelMode:
-- Bitmask values for LDAC Channel Mode
0 [+1] Flag stereo
1 [+1] Flag dual
2 [+1] Flag mono
struct SbcCodecInformation:
0 [+1] bits:
0 [+2] SbcAllocationMethod allocation_method
$next [+2] SbcSubBands subbands
$next [+4] SbcBlockLen block_length
$next [+1] UInt min_bitpool_value
$next [+1] UInt max_bitpool_value
$next [+1] bits:
0 [+4] SbcChannelMode channel_mode
$next [+4] SbcSamplingFrequency sampling_frequency
$next [+28] UInt:8[28] reserved
struct AacCodecInformation:
0 [+1] UInt object_type
$next [+1] AacEnableVariableBitRate variable_bit_rate
$next [+30] UInt:8[30] reserved
struct LdacCodecInformation:
0 [+4] UInt vendor_id
-- Must always be set to kLdacVendorId
$next [+2] UInt codec_id
-- Must always be set to kLdacCodecId
-- All other values are reserved
$next [+1] LdacBitrateIndex bitrate_index
-- See enum class LdacBitrateIndex in this file for possible values
$next [+1] bits:
0 [+3] LdacChannelMode ldac_channel_mode
-- Bitmask: LDAC channel mode (see LdacChannelMode for bitmask values)
$next [+24] UInt:8[24] reserved
# ============ Commands ============
struct StartA2dpOffloadCommand:
let vendor_size = AndroidCommandHeader.$size_in_bytes
0 [+vendor_size] AndroidCommandHeader vendor_command
$next [+4] bits:
0 [+8] A2dpCodecType codec_type
-- See enum class A2dpCodecType in this file for possible values
$next [+2] UInt max_latency
-- Max latency allowed in ms. A value of zero disables flush.
$next [+2] A2dpScmsTEnable scms_t_enable
$next [+4] bits:
0 [+8] A2dpSamplingFrequency sampling_frequency
-- See enum class A2dpSamplingFrequency in this file for possible values
$next [+1] A2dpBitsPerSample bits_per_sample
-- See enum class A2dpBitsPerSample in this file for possible values
$next [+1] A2dpChannelMode channel_mode
-- See enum class A2dpChannelMode in this file for possible values
$next [+4] UInt encoded_audio_bitrate
-- The encoded audio bitrate in bits per second
-- 0x00000000 - The audio bitrate is not specified / unused
-- 0x00000001 - 0x00FFFFFF - Encoded audio bitrate in bits per second
-- 0x01000000 - 0xFFFFFFFF - Reserved
[requires: 0x00000000 <= this <= 0x00FFFFFF]
$next [+2] UInt connection_handle
-- Connection handle of A2DP connection being configured (only the lower 12-bits are meaningful)
-- Range: 0x0000 to 0x0EFF
[requires: 0x0000 <= this <= 0x0EFF]
$next [+2] UInt l2cap_channel_id
-- L2CAP channel ID to be used for this A2DP connection
$next [+2] UInt l2cap_mtu_size
-- Maximum size of L2CAP MTU containing encoded audio packets
if codec_type == A2dpCodecType.SBC:
28 [+32] SbcCodecInformation sbc_codec_information
if codec_type == A2dpCodecType.AAC:
28 [+32] AacCodecInformation aac_codec_information
if codec_type == A2dpCodecType.LDAC:
28 [+32] LdacCodecInformation ldac_codec_information
if codec_type == A2dpCodecType.APTX || codec_type == A2dpCodecType.APTX_HD:
28 [+32] UInt:8[32] reserved
struct StopA2dpOffloadCommand:
let vendor_size = AndroidCommandHeader.$size_in_bytes
0 [+vendor_size] AndroidCommandHeader vendor_command
struct LEMultiAdvtEnableCommand:
-- LE multi-advertising enable command.
let vendor_size = AndroidCommandHeader.$size_in_bytes
0 [+vendor_size] AndroidCommandHeader vendor_command
$next [+1] hci.GenericEnableParam enable
$next [+1] UInt advertising_handle
struct LEGetVendorCapabilitiesCommand:
let hdr_size = hci.CommandHeader.$size_in_bytes
0 [+hdr_size] hci.CommandHeader header
# ============ Events ============
struct LEMultiAdvtStateChangeSubevent:
-- LE multi-advertising state change subevent.
0 [+hci.VendorDebugEvent.$size_in_bytes] hci.VendorDebugEvent vendor_event
$next [+1] UInt advertising_handle
-- Handle used to identify an advertising set.
$next [+1] hci.StatusCode status
-- Reason for state change. Currently will always be 0x00.
-- 0x00: Connection received.
$next [+2] UInt connection_handle
-- Handle used to identify the connection that caused the state change (i.e.
-- advertising instance to be disabled). Value will be 0xFFFF if invalid.
struct LEGetVendorCapabilitiesCommandCompleteEvent:
let hdr_size = hci.CommandCompleteEvent.$size_in_bytes
0 [+hdr_size] hci.CommandCompleteEvent command_complete
$next [+1] hci.StatusCode status
$next [+1] UInt max_advt_instances
-- Number of advertisement instances supported
-- Deprecated in Google feature spec v0.98 and higher
$next [+1] Capability offloaded_resolution_of_private_address
-- BT chip capability of RPA
-- Deprecated in Google feature spec v0.98 and higher
$next [+2] UInt total_scan_results_storage
-- Storage for scan results in bytes
$next [+1] UInt max_irk_list_sz
-- Number of IRK entries supported in the firmware
$next [+1] Capability filtering_support
-- Support for filtering in the controller
$next [+1] UInt max_filter
-- Number of filters supported
$next [+1] Capability activity_energy_info_support
-- Supports reporting of activity and energy information
$next [+2] bits version_supported:
-- Specifies the version of the Google feature spec supported
0 [+8] UInt major_number
$next [+8] UInt minor_number
$next [+2] UInt total_num_of_advt_tracked
-- Total number of advertisers tracked for OnLost/OnFound purposes
$next [+1] Capability extended_scan_support
-- Supports extended scan window and interval
$next [+1] Capability debug_logging_supported
-- Supports logging of binary debug information from controller
$next [+1] Capability le_address_generation_offloading_support
-- Deprecated in Google feature spec v0.98 and higher
$next [+4] bits:
0 [+5] AudioCodecSupportMask a2dp_source_offload_capability_mask
$next [+1] Capability bluetooth_quality_report_support
-- Supports reporting of Bluetooth Quality events
$next [+4] bits:
0 [+5] AudioCodecSupportMask dynamic_audio_buffer_support
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