Cannot use hardware mixer in combination with Bluealsa

[Matthijsy]

Describe the bug
I am trying to use the hardware mixer in combination with Bluealsa in my snapclient configuration. My system has a Bluetooth speaker connected, which uses bluealsa and works fine when using the software mixer. However as soon as I try the following it give an error.

snapclient -h <host> -s bluealsa --mixer hardware:'<device name>'

The error is as follows:

[Fatal] (Snapclient) Exception: assign: Bad file descriptor [system:9 at ./boost_1_85_0/boost/asio/detail/impl/reactive_descriptor_service.ipp:120 in function 'assign']
[Notice] (Snapclient) Snapclient terminated.

Environment details

• OS: Debian 12
• Snapcast version: v0.29.0
• Installed from Github releases

Attach logfile if applicable
Generate logs with snapclient --logfilter debug or snapserver --logging.filter debug if possible and paste them in the following codeblock

2025-01-01 21-09-08.075 [Info] (Snapclient) Version 0.29.0, revision 208066e5
2025-01-01 21-09-08.075 [Info] (Connection) Resolving host IP for: <redacted>
2025-01-01 21-09-08.075 [Info] (Connection) Connecting to <redacted>:1704
2025-01-01 21-09-08.076 [Notice] (Connection) Connected to <redacted>
2025-01-01 21-09-08.076 [Info] (Connection) My MAC: "<redacted>", socket: 8
2025-01-01 21-09-08.083 [Info] (Controller) ServerSettings - buffer: 1000, latency: 0, volume: 100, muted: 0
2025-01-01 21-09-08.084 [Info] (Controller) Codec: flac, sampleformat: 44100:16:2
2025-01-01 21-09-08.084 [Info] (Player) Player name: alsa, device: bluealsa, description: Bluetooth Audio Hub, idx: 4, sharing mode: unspecified, parameters: <none>
2025-01-01 21-09-08.084 [Info] (Player) Mixer mode: hardware, parameters: SRS-XB100 - A2DP
2025-01-01 21-09-08.084 [Info] (Player) Sampleformat: 44100:16:2, stream: 44100:16:2
2025-01-01 21-09-08.084 [Info] (Alsa) Using default buffer_time: 80 ms, default fragments: 4
D: bluealsa-pcm.c:1309: Getting BlueALSA PCM: PLAYBACK 00:A4:1C:20:5C:A7 a2dp
D: bluealsa-pcm.c:1062: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Setting constraints
D: bluealsa-pcm.c:532: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Initializing HW
D: bluealsa-pcm.c:567: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: FIFO buffer size: 1024 frames
D: bluealsa-pcm.c:581: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Selected HW buffer: 4 periods x 3840 bytes == 15360 bytes
D: bluealsa-pcm.c:600: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Initializing SW
D: bluealsa-pcm.c:600: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Initializing SW
D: bluealsa-pcm.c:600: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Initializing SW
D: bluealsa-pcm.c:639: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Prepared
2025-01-01 21-09-08.272 [Info] (Alsa) PCM name: bluealsa, sample rate: 44100 Hz, channels: 2, buffer time: 80000 us, periods: 4, period time: 20000 us, period frames: 882
D: bluealsa-pcm.c:600: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Initializing SW
ALSA lib bluealsa-ctl.c:205:(bluealsa_dev_fetch_battery) Couldn't get device battery status: Object does not exist at path “/org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/rfcomm”
ALSA lib bluealsa-ctl.c:205:(bluealsa_dev_fetch_battery) Couldn't get device battery status: Object does not exist at path “/org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/rfcomm”
D: bluealsa-pcm.c:392: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Stopping
D: bluealsa-pcm.c:392: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Stopping
D: bluealsa-pcm.c:592: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Freeing HW
D: bluealsa-pcm.c:443: /org/bluealsa/hci0/dev_00_A4_1C_20_5C_A7/a2dpsrc/sink: Closing
2025-01-01 21-09-08.277 [Fatal] (Snapclient) Exception: assign: Bad file descriptor [system:9 at ./boost_1_85_0/boost/asio/detail/impl/reactive_descriptor_service.ipp:120 in function 'assign']
2025-01-01 21-09-08.277 [Notice] (Snapclient) Snapclient terminated.