Add hw: and plughw: devices for true bit-perfect playback
ALSA Backend Changes:
- Include hw:X,Y and plughw:X,Y devices from CPAL enumeration
- These devices bypass ALL ALSA plugins (dmix, resampling, etc.)
- Parse aplay -l to build card number → description map
- hw: devices get friendly names: "Cambridge Audio USB Audio 2.0 (Direct Hardware - Bit-perfect)"
Why This Matters:
- front:CARD=C20,DEV=0 → Has dmix plugin → resamples to 44.1kHz
- iec958:CARD=C20,DEV=0 → Has plugins → resamples to 44.1kHz
- hw:4,0 → Direct hardware access → TRUE bit-perfect → 96kHz playback
Device Description Examples:
- hw:4,0 → "Cambridge Audio USB Audio 2.0 (Direct Hardware - Bit-perfect)"
- plughw:4,0 → "Cambridge Audio USB Audio 2.0 (Plugin Hardware)"
Blacklist Updates:
- Filter surround*, usbstream, pipewire, pulse, bare sysdefault
- Keep hw:, plughw:, default, sysdefault:CARD=, front:CARD=, hdmi:CARD=, iec958:CARD=
User should now select hw:4,0 device for true bit-perfect playback that
changes sample rate to match the track (96kHz, 192kHz, etc.)
vicrodh
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