我使用 HiFiBerry AMP2 将 2 个传统扬声器连接到 Raspberry Pi 3。这在 Volumio 上工作得很好。现在我想更进一步：我不想使用 Volumio，而是想使用 Raspberry PI 作为我的 Echo Dot 的扬声器，这样我就可以使用语音控制在该设置上播放 TuneIn 广播。
我选择使用 Raspberry OS 32 位 Bullseye + PulseAudio v34，并使用了几个博客和教程才到达现在的位置，但我卡在了最后一步。
有效的方法：
- HiFiBerry AMP2 运行良好 - 已通过 Volumio 测试
- 我可以用 mplayer 播放一首歌曲
- 我的手机可以连接到 Pi 并显示它可以用于音频但是：当手机通过蓝牙连接并且我播放 Spotify 时，我在扬声器上听不到它的声音，只是一片寂静。
以下是有关我的设置的一些信息：
当电话接通时，我看到 2 个来源，均已暂停：
pactl list cards
Card #0
Name: alsa_card.platform-soc_sound
Driver: module-alsa-card.c
Owner Module: 7
Properties:
alsa.card = "1"
alsa.card_name = "snd_rpi_hifiberry_dacplus"
alsa.long_card_name = "snd_rpi_hifiberry_dacplus"
alsa.driver_name = "snd_soc_hifiberry_dacplus"
device.bus_path = "platform-soc:sound"
sysfs.path = "/devices/platform/soc/soc:sound/sound/card1"
device.form_factor = "internal"
device.string = "1"
device.description = "Built-in Audio"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card"
Profiles:
output:stereo-fallback: Stereo Output (sinks: 1, sources: 0, priority: 5100, available: yes)
output:multichannel-output: Multichannel Output (sinks: 1, sources: 0, priority: 100, available: yes)
off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
Active Profile: output:stereo-fallback
Ports:
analog-output: Analog Output (type: Analog, priority: 9900, latency offset: 0 usec, availability unknown)
Part of profile(s): output:stereo-fallback
Card #3
Name: bluez_card.F4_12_B9_FA_D2_E1
Driver: module-bluez5-device.c
Owner Module: 30
Properties:
device.description = "MyPhone"
device.string = "A4:75:B9:64:A0:B7"
device.api = "bluez"
device.class = "sound"
device.bus = "bluetooth"
device.form_factor = "phone"
bluez.path = "/org/bluez/hci0/dev_F4_12_B9_FA_D2_E1"
bluez.class = "0x5a020c"
bluez.alias = "MyPhone"
device.icon_name = "audio-card-bluetooth"
Profiles:
a2dp_source: High Fidelity Capture (A2DP Source) (sinks: 0, sources: 1, priority: 20, available: yes)
headset_audio_gateway: Headset Audio Gateway (HSP/HFP) (sinks: 1, sources: 1, priority: 10, available: yes)
off: Off (sinks: 0, sources: 0, priority: 0, available: yes)
Active Profile: a2dp_source
Ports:
phone-output: Phone (type: Phone, priority: 0, latency offset: 0 usec, availability unknown)
Part of profile(s): headset_audio_gateway
phone-input: Phone (type: Phone, priority: 0, latency offset: 0 usec, availability unknown)
Part of profile(s): a2dp_source, headset_audio_gateway
pactl list sources
Source #0
State: SUSPENDED
Name: alsa_output.platform-soc_sound.stereo-fallback.monitor
Description: Monitor of Built-in Audio Stereo
Driver: module-alsa-card.c
Sample Specification: s16le 2ch 44100Hz
Channel Map: front-left,front-right
Owner Module: 7
Mute: no
Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
Base Volume: 65536 / 100% / 0.00 dB
Monitor of Sink: alsa_output.platform-soc_sound.stereo-fallback
Latency: 0 usec, configured 0 usec
Flags: DECIBEL_VOLUME LATENCY
Properties:
device.description = "Monitor of Built-in Audio Stereo"
device.class = "monitor"
alsa.card = "1"
alsa.card_name = "snd_rpi_hifiberry_dacplus"
alsa.long_card_name = "snd_rpi_hifiberry_dacplus"
alsa.driver_name = "snd_soc_hifiberry_dacplus"
device.bus_path = "platform-soc:sound"
sysfs.path = "/devices/platform/soc/soc:sound/sound/card1"
device.form_factor = "internal"
device.string = "1"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card"
Formats:
pcm
Source #4
State: SUSPENDED
Name: bluez_source.F4_12_B9_FA_D2_E1.a2dp_source
Description: MyPhone
Driver: module-bluez5-device.c
Sample Specification: s16le 2ch 44100Hz
Channel Map: front-left,front-right
Owner Module: 30
Mute: no
Volume: front-left: 65536 / 100% / 0.00 dB, front-right: 65536 / 100% / 0.00 dB
balance 0.00
Base Volume: 65536 / 100% / 0.00 dB
Monitor of Sink: n/a
Latency: 0 usec, configured 0 usec
Flags: HARDWARE DECIBEL_VOLUME LATENCY
Properties:
bluetooth.protocol = "a2dp_source"
device.description = "MyPhone"
device.string = "A4:75:B9:64:A0:B7"
device.api = "bluez"
device.class = "sound"
device.bus = "bluetooth"
device.form_factor = "phone"
bluez.path = "/org/bluez/hci0/dev_F4_12_B9_FA_D2_E1"
bluez.class = "0x5a020c"
bluez.alias = "MyPhone"
device.icon_name = "audio-card-bluetooth"
Ports:
phone-input: Phone (type: Phone, priority: 0, availability unknown)
Active Port: phone-input
Formats:
pcm
pactl list sinks
Sink #0
State: SUSPENDED
Name: alsa_output.platform-soc_sound.stereo-fallback
Description: Built-in Audio Stereo
Driver: module-alsa-card.c
Sample Specification: s16le 2ch 44100Hz
Channel Map: front-left,front-right
Owner Module: 7
Mute: no
Volume: front-left: 13107 / 20% / -41.94 dB, front-right: 13107 / 20% / -41.94 dB
balance 0.00
Base Volume: 65536 / 100% / 0.00 dB
Monitor Source: alsa_output.platform-soc_sound.stereo-fallback.monitor
Latency: 0 usec, configured 0 usec
Flags: HARDWARE DECIBEL_VOLUME LATENCY
Properties:
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "HiFiBerry DAC+ HiFi pcm512x-hifi-0"
alsa.id = "HiFiBerry DAC+ HiFi pcm512x-hifi-0"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "1"
alsa.card_name = "snd_rpi_hifiberry_dacplus"
alsa.long_card_name = "snd_rpi_hifiberry_dacplus"
alsa.driver_name = "snd_soc_hifiberry_dacplus"
device.bus_path = "platform-soc:sound"
sysfs.path = "/devices/platform/soc/soc:sound/sound/card1"
device.form_factor = "internal"
device.string = "hw:1"
device.buffering.buffer_size = "10576"
device.buffering.fragment_size = "2644"
device.access_mode = "mmap"
device.profile.name = "stereo-fallback"
device.profile.description = "Stereo"
device.description = "Built-in Audio Stereo"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card"
Ports:
analog-output: Analog Output (type: Analog, priority: 9900, availability unknown)
Active Port: analog-output
Formats:
pcm
aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: vc4hdmi [vc4-hdmi], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi
pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0
我注意到：
- 我很惊讶地看到来源也提到了 HiFiBerry
- 许多博客都提到了 a2dp 配置文件，但我只看到 a2dp_source 配置文件
- 为什么是源 #4？我尝试连接/断开连接几次。我应该做一些清理吗？
我尝试过但没有效果的方法：
- 我尝试将源直接连接到接收器：pactl load-module module-loopback source=bluez_source.F4_12_B9_FA_D2_E1.a2dp_source sink=alsa_output.platform-soc_sound.stereo-fallback
- 我在 /etc/pulse/default.pa 文件中设置了默认源和接收器
关于我能做什么，还有其他建议吗？感觉我快到了，但还没有……
谢谢！