关于在deepin V23上启用小米四单元耳机蓝牙LDAC模式的尝试- Community

[Exchange and share] 关于在deepin V23上启用小米四单元耳机蓝牙LDAC模式的尝试

deepin 23 438 views · 12 replies ·

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deepin

2024-10-08 16:11

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1、连接蓝牙耳机，连不上的时候可以先试试在系统监视器里搜索pulseaudio，右键结束进程，系统会自动重新开启pulseaudio进程

2、sudo nano /etc/pulse/daemon.conf 找到

; default-sample-format = s24le                     #默认采样位深度
default-sample-rate = 176400                        #默认采样频率
alternate-sample-rate = 96000                       #次选采样频率
; default-sample-channels = 2; default-channel-map = front-left,front-right

第一、二、三行前面的分号去掉，Ctrl+O保存，Ctrl+X退出，重执行步骤1重启pulseaudio

后面的数值可以动一动，一般为44100/48000的倍数，耳机支持LDAC的可以用96000来开启LDAC，我的小米四单元就是靠这个开启的，分号注释掉这三行默认就只能44100

3、可以用命令 pacmd list-sinks | grep sample 查看当前声卡的情况

sample spec: s16le 2ch 96000Hz                     #本机声卡
sample spec: float32le 2ch 96000Hz                 #蓝牙接收器

也可以用命令 pacmd list-sinks 查看声卡的详细情况

* index: 1
        name: 
        driver: 
        flags: HARDWARE HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
        state: RUNNING
        suspend cause: (none)
        priority: 9050
        volume: front-left: 10485 /  16% / -28.65 dB,   front-right: 10485 /  16% / -28.65 dB
                balance 0.00
        base volume: 65536 / 100% / 0.00 dB
        volume steps: 128
        muted: no
        current latency: 38.74 ms
        max request: 6 KiB
        max rewind: 0 KiB
        monitor source: 3
        sample spec: float32le 2ch 96000Hz
        channel map: front-left,front-right
                     立体声
        used by: 1
        linked by: 1
        fixed latency: 33.00 ms
        card: 2 
        module: 22
        properties:
                bluetooth.protocol = "a2dp_sink"
                bluetooth.codec = "ldac_sq"
                device.description = "Mi Quad Driver In-Ear Headphones"
                device.string = "9C:97:89:1D:8E:75"
                device.api = "bluez"
                device.class = "sound"
                device.bus = "bluetooth"
                device.form_factor = "headset"
                bluez.path = "/org/bluez/hci0/dev_9C_97_89_1D_8E_75"
                bluez.class = "0x240404"
                bluez.alias = "Mi Quad Driver In-Ear Headphones"
                device.icon_name = "audio-headset-bluetooth"
                device.intended_roles = "phone"
        ports:
                headset-output: 耳机 (priority 0, latency offset 0 usec, available: yes)
                        properties:

        active port:

4、如果出现断开后蓝牙耳机无法再连接的情况，把步骤2中这三行分号加上注释掉，然后执行步骤1重启pulseaudio，控制中心忽略掉耳机后再重连耳机，连接上后再执行步骤2更改输出模式。

5、上述操作的原因个人猜测：耳机初连时需要SBC握手？握手成功后更改pulseaudio默认/次选采样率到96KHz，pulseaudio和耳机只有采用LDAC才能达到这个采样率进而开启LDAC模式

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