Fix ALSA hardware volume detection for CARD=<name> and bare sysdefault devices - #279
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Fix ALSA hardware volume detection for CARD=<name> and bare sysdefault devices#279OnFreund wants to merge 1 commit into
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parse_alsa_card() only matched PortAudio's hw:N,M numeric card form, so devices selected via --audio-device using the plughw:/dmix: CARD=<name> convention (needed to reach ALSA's plug/dmix conversion layer, since raw hw:N,M often fails to open for playback) silently fell back to software volume even when a real hardware mixer existed. Also handle PortAudio's bare "sysdefault"/"default" enumeration, which carries no card info at all: cross-reference aplay -L's fully-qualified hints (e.g. sysdefault:CARD=vc4hdmi) to recover the card, backing off to software volume only when the match is ambiguous (multiple cards each exposing their own default hint) rather than guessing. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
parse_alsa_card()insendspin/alsa_volume.pyonly recognized PortAudio's numerichw:N,Mcard annotation. Devices selected via--audio-deviceusing theplughw:CARD=<name>,DEV=<n>/dmix:CARD=<name>,DEV=<n>convention — often needed because rawhw:N,Mbypasses ALSA'splug/dmixconversion layer and fails to open for playback at all — weren't recognized, so hardware volume control silently fell back to software volume even when a real mixer element existed.parse_alsa_card()now also extracts the card's string name from aCARD=<name>pattern, andfind_mixer_element()/AlsaVolumeController/async_check_alsa_available()were generalized to acceptint | strcard identifiers. Confirmed via theamixersource that-cresolves either a numeric index or a card name throughsnd_card_get_index()internally, so passing the name straight through works.sysdefault/defaultdevice enumeration (no card info at all in the name), which turned up in real-world testing on an ODROID-N2. Since the string carries no card identity, this cross-referencesaplay -L's fully-qualified hints (e.g.sysdefault:CARD=ODROIDN2) to recover the card, and only resolves when exactly one hint matches — on a system with multiple cards each exposing their own default hint, it backs off to software volume rather than guessing which one is meant.Test plan
uv run ruff check --fix .uv run ruff format .uv run mypy sendspin— no issuesuv run pytest tests/ -q— 150 passed (11 new tests coveringCARD=<name>parsing, the plughw/dmix discovery flow, and the bare-sysdefault resolution including the ambiguous multi-card and no-hint cases)🤖 Generated with Claude Code