isr.py carried a plugin architecture — AudioBackend ABC, a _backend_classes
registry, _discover_backends, available_backends/get_backend, a
preferred_backend config knob — for exactly one implementation. It was
also the source of three real bugs:
* find_device() returned None before reaching the ALSA PCM-name fallback
whenever `arecord -l` enumerated nothing, so the documented
`device = shared_mic` (dsnoop from asound.conf) case failed outright on
any host with no hardware card. The fallback is the whole point: those
PCMs never appear in `arecord -l`.
* `device = monitor` could never resolve. ALSA has no generic monitor
source and list_devices hardcoded is_monitor=False, so the keyword —
advertised in config.example.ini as the "EASY" way to capture system
audio — only ever produced "device not found". Removed; it is a
PulseAudio idea that outlived the PulseAudio backend.
* list_all_devices() deduplicated by lowercased name "in case a device
appears in multiple backends". With one backend what it actually did
was delete the second of two identical USB cards. Dedup dropped.
find_device() now always returns a device, so _resolve_device's
unreachable "Available devices:" error is gone; an unknown spec is
passed to ALSA verbatim and logged. AudioDevice loses backend/
is_monitor plus channels/sample_rate — the latter were hardcoded 2/44100
and only ever printed by --list-devices, i.e. numbers with no bearing on
what gets recorded.
--list-devices now says outright that it lists hardware cards only, which
is where the shared_mic confusion started.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
adminandClaude Opus 5
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