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hw:0,0 is an exclusive ALSA device — darkice holding it caused arecord to fail silently (stderr was /dev/null), leaving all recordings at 0 bytes with no errors in the log. asound.conf: defines a dsnoop virtual device 'shared_mic' that opens hw:0,0 once and lets multiple processes capture simultaneously. docker-compose.yml: mount asound.conf into the container as /etc/asound.conf; add ipc: host so the container shares the host IPC namespace (dsnoop uses System V shared memory which does not cross the container IPC boundary without this). config.example.ini: document the dsnoop setup and shared-device pattern. README, CLAUDE.md: document the full setup procedure.
21 lines
559 B
Plaintext
21 lines
559 B
Plaintext
# Shared ALSA capture device using dsnoop.
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# Allows multiple processes (e.g. darkice and ISR) to read from hw:0,0 simultaneously.
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#
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# Deploy:
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# sudo cp asound.conf /etc/asound.conf (host — for darkice)
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# docker-compose.yml mounts it into the recorder container automatically.
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#
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# Both darkice and ISR must use "shared_mic" as their device name instead of "hw:0,0".
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pcm.shared_mic {
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type dsnoop
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ipc_key 1024
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ipc_perm 0666
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slave {
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pcm "hw:0,0"
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channels 2
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rate 48000
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format S16_LE
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}
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}
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