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Linux蓝牙之宽带语音(WBS)

  • 2026-07-02 08:22:45
Linux蓝牙之宽带语音(WBS)

Linux蓝牙之宽带语音(WBS)

1. 概述

1.1 什么是WBS

WBS(Wideband Speech,宽带语音)是蓝牙技术联盟(SIG)定义的一种高质量语音传输技术,也称为蓝牙宽带语音或HD Voice。它使用 mSBC 编码 在 eSCO(增强同步连接)链路上提供16kHz采样率的语音传输,相比传统的窄带语音(NBS,8kHz采样率)显著提升了通话质量。

1.2 技术背景

特性
窄带语音(NBS)
宽带语音(WBS)
采样率
8kHz
16kHz
频率范围
300Hz-3400Hz
50Hz-7000Hz
编码算法
CVSD
mSBC
语音质量
MOS 3.0-3.5
MOS 3.5-4.0
蓝牙版本
Bluetooth 1.x+
Bluetooth 2.1+(HFP 1.6+)

1.3 应用场景

  • • 蓝牙免提通话(HFP):车载蓝牙、蓝牙耳机
  • • VoIP通话:通过蓝牙设备进行网络语音通话
  • • 语音助手:Siri、Google Assistant、Alexa等
  • • 助听设备:高质量音频传输

2. 技术原理

2.1 mSBC编码

mSBC(modified Sub-Band Coding)是WBS的核心编码算法:

输入PCM音频(16kHz, 16bit)
        ↓
    子带分解(4个子带)
        ↓
    自适应量化
        ↓
    比特分配
        ↓
输出mSBC比特流(60字节/帧)

2.2 SCO/eSCO传输

WBS使用透明模式(Transparent Mode)的eSCO链路传输:

┌─────────────────────────────────────────────────────────┐
│                    eSCO链路参数                          │
├─────────────────────────────────────────────────────────┤
│  参数              │  T1配置        │  T2配置           │
├─────────────────────────────────────────────────────────┤
│  包类型            │  EV3           │  2EV3             │
│  最大延迟          │  8ms           │  13ms             │
│  重传次数          │  2次           │  2次              │
│  空中传输速率      │  64kbps        │  64kbps           │
│  带宽需求          │  80kbps        │  80kbps           │
└─────────────────────────────────────────────────────────┘

2.3 USB Alternate Settings

对于USB蓝牙适配器,WBS需要选择合适的 Alternate Settings(不重新枚举设备的情况下,动态切换不同的配置方案,例如改变端点的数量、类型、数据包大小或带宽需求):

┌─────────────────────────────────────────────────────────┐
│               USB Alternate Settings                     │
├─────────────────────────────────────────────────────────┤
│  ALT    │  包大小    │  间隔      │  用途               │
├─────────────────────────────────────────────────────────┤
│  ALT1   │  17字节    │  1ms       │  NB语音/兼容        │
│  ALT3   │  25字节    │  7.5ms     │  WBS备选            │
│  ALT6   │  63字节    │  7.5ms     │  WBS首选            │
└─────────────────────────────────────────────────────────┘

3. Linux内核实现

下面我们来看看在linux中关于 WBS 的实现。

基于内核v7.1.0-rc6

3.1 代码架构

┌─────────────────────────────────────────────────────────┐
│                    用户空间                              │
│  ┌─────────────────────────────────────────────────────┐│
│  │  BlueZ / PulseAudio / PipeWire                      ││
│  └─────────────────────────────────────────────────────┘│
└────────────────────────┬────────────────────────────────┘
                         │ MGMT API
┌────────────────────────┴────────────────────────────────┐
│                    内核空间                              │
│  ┌─────────────────────────────────────────────────────┐│
│  │  net/bluetooth/mgmt.c                               ││
│  │  - set_wideband_speech()                            ││
│  └─────────────────────────────────────────────────────┘│
│  ┌─────────────────────────────────────────────────────┐│
│  │  net/bluetooth/hci_conn.c                           ││
│  │  - hci_setup_sync() / esco_param_msbc[]             ││
│  └─────────────────────────────────────────────────────┘│
│  ┌─────────────────────────────────────────────────────┐│
│  │  net/bluetooth/sco.c                                ││
│  │  - SCO连接管理                                       ││
│  └─────────────────────────────────────────────────────┘│
│  ┌─────────────────────────────────────────────────────┐│
│  │  drivers/bluetooth/                                 ││
│  │  - btintel.c / btusb.c / btrtl.c / hci_qca.c       ││
│  └─────────────────────────────────────────────────────┘│
└─────────────────────────────────────────────────────────┘

3.2 关键数据结构

/* WBS eSCO参数定义 - net/bluetooth/hci_conn.c:65-68 */
static
 conststruct sco_param esco_param_msbc[] = {
    { EDR_ESCO_MASK & ~ESCO_2EV3, 0x000d, 0x02 }, /* T2 */
    { EDR_ESCO_MASK | ESCO_EV3,   0x0008, 0x02 }, /* T1 */
};

/* 空中模式定义 - include/net/bluetooth/hci_core.h:2508 */

#define SCO_AIRMODE_TRANSP     0x0003  /* 透明模式,用于mSBC */

#define SCO_AIRMODE_CVSD       0x0000  /* CVSD模式,用于NB语音 */

4. 支持流程分析

4.1 硬件支持检测

驱动程序在初始化时检测硬件是否支持WBS,并设置相应的quirk标志:

/* Intel设备 - drivers/bluetooth/btintel.c:3556-3559 */
if
 (!btintel_test_flag(hdev, INTEL_ROM_LEGACY_NO_WBS_SUPPORT))
    hci_set_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);

/* USB设备 - drivers/bluetooth/btusb.c:4341-4342 */

if
 (id->driver_info & BTUSB_WIDEBAND_SPEECH)
    hci_set_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);

/* Realtek设备 - drivers/bluetooth/btrtl.c:1310-1320 */

switch
 (btrtl_dev->project_id) {
case
 CHIP_ID_8822C:
case
 CHIP_ID_8852A:
case
 CHIP_ID_8852B:
case
 CHIP_ID_8852C:
case
 CHIP_ID_8851B:
case
 CHIP_ID_8922A:
case
 CHIP_ID_8852BT:
case
 CHIP_ID_8761C:
    hci_set_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);
    break
;
}

/* Qualcomm设备 - drivers/bluetooth/hci_qca.c:2553-2555 */

if
 (data->capabilities & QCA_CAP_WIDEBAND_SPEECH)
    hci_set_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);

4.2 用户空间配置

用户空间通过MGMT API控制WBS功能:

/* net/bluetooth/mgmt.c:4402-4449 */
static
 int set_wideband_speech(struct sock *sk, struct hci_dev *hdev,
                               void
 *data, u16 len)

{
struct mgmt_mode *cp =
 data;
    int
 err;
    bool
 changed = false;

    /* 检查硬件是否支持WBS */

    if
 (!hci_test_quirk(hdev, HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED))
        return
 mgmt_cmd_status(sk, hdev->id,
                               MGMT_OP_SET_WIDEBAND_SPEECH,
                               MGMT_STATUS_NOT_SUPPORTED);

    /* 验证参数 */

    if
 (cp->val != 0x00 && cp->val != 0x01)
        return
 mgmt_cmd_status(sk, hdev->id,
                               MGMT_OP_SET_WIDEBAND_SPEECH,
                               MGMT_STATUS_INVALID_PARAMS);

    hci_dev_lock(hdev);

    /* 设备已上电时不允许更改 */

    if
 (hdev_is_powered(hdev) &&
        !!cp->val != hci_dev_test_flag(hdev,
                                       HCI_WIDEBAND_SPEECH_ENABLED)) {
        err = mgmt_cmd_status(sk, hdev->id,
                              MGMT_OP_SET_WIDEBAND_SPEECH,
                              MGMT_STATUS_REJECTED);
        goto
 unlock;
    }

    /* 设置或清除WBS启用标志 */

    if
 (cp->val)
        changed = !hci_dev_test_and_set_flag(hdev,
                                             HCI_WIDEBAND_SPEECH_ENABLED);
    else

        changed = hci_dev_test_and_clear_flag(hdev,
                                             HCI_WIDEBAND_SPEECH_ENABLED);

    err = send_settings_rsp(sk, MGMT_OP_SET_WIDEBAND_SPEECH, hdev);
    if
 (err < 0)
        goto
 unlock;

    if
 (changed)
        err = new_settings(hdev, sk);

unlock:
    hci_dev_unlock(hdev);
    return
 err;
}

4.3 SCO连接建立

建立WBS SCO连接时选择mSBC参数:

/* net/bluetooth/hci_conn.c:407-457 */
static
 bool hci_setup_sync_conn(struct hci_conn *conn, __u16 handle)
{
struct hci_dev *hdev =
 conn->hdev;
struct hci_cp_setup_sync_conn cp;

    const
struct sco_param *param;

    conn->state = BT_CONNECT;
    conn->out = true;
    conn->attempt++;

    cp.handle = cpu_to_le16(handle);
    cp.tx_bandwidth = cpu_to_le32(0x00001f40);
    cp.rx_bandwidth = cpu_to_le32(0x00001f40);
    cp.voice_setting = cpu_to_le16(conn->setting);

    /* 根据空中模式选择参数 */

    switch
 (conn->setting & SCO_AIRMODE_MASK) {
    case
 SCO_AIRMODE_TRANSP:  /* WBS模式 */
        if
 (!find_next_esco_param(conn, esco_param_msbc,
                                  ARRAY_SIZE(esco_param_msbc)))
            return
 false;
        param = &esco_param_msbc[conn->attempt - 1];
        break
;
    case
 SCO_AIRMODE_CVSD:    /* NB模式 */
        if
 (conn->parent && lmp_esco_capable(conn->parent)) {
            if
 (!find_next_esco_param(conn, esco_param_cvsd,
                                      ARRAY_SIZE(esco_param_cvsd)))
                return
 false;
            param = &esco_param_cvsd[conn->attempt - 1];
        } else {
            if
 (conn->attempt > ARRAY_SIZE(sco_param_cvsd))
                return
 false;
            param = &sco_param_cvsd[conn->attempt - 1];
        }
        break
;
    default
:
        return
 false;
    }

    cp.retrans_effort = param->retrans_effort;
    cp.pkt_type = __cpu_to_le16(param->pkt_type);
    cp.max_latency = __cpu_to_le16(param->max_latency);

    if
 (hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp) < 0)
        return
 false;

    return
 true;
}

4.4 USB Alternate Setting选择

USB蓝牙适配器在WBS连接时选择合适的alternate setting:

/* drivers/bluetooth/btusb.c:2415-2433 */
} else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
    /* Bluetooth USB spec recommends alt 6 (63 bytes), but
     * many adapters do not support it.  Alt 1 appears to
     * work for all adapters that do not have alt 6, and
     * which work with WBS at all.  Some devices prefer
     * alt 3 (HCI payload >= 60 Bytes let air packet
     * data satisfy 60 bytes), requiring
     * MTU >= 3 (packets) * 25 (size) - 3 (headers) = 72
     * see also Core spec 5, vol 4, B 2.1.1 & Table 2.1.
     */

    if
 (btusb_find_altsetting(data, 6))
        new_alts = 6;
    else
 if (btusb_find_altsetting(data, 3) &&
             hdev->sco_mtu >= 72 &&
             test_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags))
        new_alts = 3;
    else

        new_alts = 1;
}

4.5 HCI命令配置

配置错误数据报告以支持WBS:

/* net/bluetooth/hci_sync.c:4813-4832 */
static
 int hci_set_err_data_report_sync(struct hci_dev *hdev)
{
struct hci_cp_write_def_err_data_reporting cp;

    bool
 enabled = hci_dev_test_flag(hdev, HCI_WIDEBAND_SPEECH_ENABLED);

    /* 检查命令支持和特性支持 */

    if
 (!(hdev->commands[18] & 0x08) ||
        !(hdev->features[0][6] & LMP_ERR_DATA_REPORTING) ||
        hci_test_quirk(hdev, HCI_QUIRK_BROKEN_ERR_DATA_REPORTING))
        return
 0;

    if
 (enabled == hdev->err_data_reporting)
        return
 0;

    memset
(&cp, 0, sizeof(cp));
    cp.err_data_reporting = enabled ? ERR_DATA_REPORTING_ENABLED :
                           ERR_DATA_REPORTING_DISABLED;

    return
 __hci_cmd_sync_status(hdev, HCI_OP_WRITE_DEF_ERR_DATA_REPORTING,
                                sizeof
(cp), &cp, HCI_CMD_TIMEOUT);
}

5. 完整流程图

Intel设备

USB设备

Realtek设备

Qualcomm设备

不支持

支持

不支持

val=0或1

其他值

WBS

NB

T2

T1

支持

不支持

支持

不支持

蓝牙驱动初始化
检测硬件WBS支持
设置HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED
不设置quirk
hci_register_dev
用户空间查询WBS支持
检查quirk标志
返回MGMT_SETTING_WIDEBAND_SPEECH
返回不支持
用户空间发送SET_WIDEBAND_SPEECH
验证参数
设置HCI_WIDEBAND_SPEECH_ENABLED
返回INVALID_PARAMS
发送settings_rsp
通知设置变更
建立SCO连接
选择air_mode
SCO_AIRMODE_TRANSP
SCO_AIRMODE_CVSD
选择eSCO参数
尝试参数
2EV3, max_latency=13ms
EV3, max_latency=8ms
发送SETUP_SYNC_CONN
USB适配器?
选择alternate setting
建立连接
查找ALT6
使用ALT6
查找ALT3且MTU>=72
使用ALT3
使用ALT1
配置错误数据报告
WBS连接建立完成

6. 参考资料

  • • Bluetooth Core Specification 5.0
  • • HFP Specification 1.8
  • • Linux Bluetooth Subsystem
  • • BlueZ User Space

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  1. CONNECT:[ UseTime:0.000617s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000662s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003035s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000565s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000525s ]
  6. SELECT * FROM `set` [ RunTime:0.009051s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000663s ]
  8. SELECT * FROM `article` WHERE `id` = 499788 LIMIT 1 [ RunTime:0.032861s ]
  9. UPDATE `article` SET `lasttime` = 1783032286 WHERE `id` = 499788 [ RunTime:0.033356s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.008879s ]
  11. SELECT * FROM `article` WHERE `id` < 499788 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.025410s ]
  12. SELECT * FROM `article` WHERE `id` > 499788 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.024734s ]
  13. SELECT * FROM `article` WHERE `id` < 499788 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015500s ]
  14. SELECT * FROM `article` WHERE `id` < 499788 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009079s ]
  15. SELECT * FROM `article` WHERE `id` < 499788 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000984s ]
0.242417s