我使用的是 Ubuntu 20.04 LTS，有一对 Jabra Active Elite 75t 耳塞。
当我通过蓝牙连接它们时，在 A2DP 配置文件中它们被添加为接收器，而不是源。作为源，它们仅在 HSP/HFP 配置文件中可用，该配置文件的音质较差。
如何配置 Pulseaudio 以在 A2DP 配置文件中添加麦克风输入？
输出自pactl list cards
Card #1
Name: bluez_card.70_BF_92_D0_E0_B1
Driver: module-bluez5-device.c
Owner Module: 24
Properties:
device.description = "Jabra Elite Active 75t"
device.string = "70:BF:92:D0:E0:B1"
device.api = "bluez"
device.class = "sound"
device.bus = "bluetooth"
device.form_factor = "headset"
bluez.path = "/org/bluez/hci0/dev_70_BF_92_D0_E0_B1"
bluez.class = "0x240404"
bluez.alias = "Jabra Elite Active 75t"
device.icon_name = "audio-headset-bluetooth"
device.intended_roles = "phone"
Profiles:
headset_head_unit: Headset Head Unit (HSP/HFP) (sinks: 1, sources: 1, priority: 30, available: yes)
a2dp_sink: High Fidelity Playback (A2DP Sink) (sinks: 1, sources: 0, priority: 40, available: yes)
off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
Active Profile: a2dp_sink
Ports:
headset-output: Headset (priority: 0, latency offset: 0 usec)
Part of profile(s): headset_head_unit, a2dp_sink
headset-input: Headset (priority: 0, latency offset: 0 usec)
Part of profile(s): headset_head_unit
bluetoothd日志：
Jun 02 17:37:51 mptop4 bluetoothd[13144]: Starting SDP server
Jun 02 17:37:51 mptop4 bluetoothd[13144]: Bluetooth management interface 1.14 initialized
Jun 02 17:37:51 mptop4 bluetoothd[13144]: Endpoint registered: sender=:1.148 path=/MediaEndpoint/A2DPSink/sbc
Jun 02 17:37:51 mptop4 bluetoothd[13144]: Endpoint registered: sender=:1.148 path=/MediaEndpoint/A2DPSource/sbc
Jun 02 17:38:31 mptop4 bluetoothd[13144]: /org/bluez/hci0/dev_70_BF_92_D0_E0_B1/sep1/fd0: fd(51) ready