ECP-0029: Linux DVB Auto-Discovery (Adapters and Channels)

Status: Draft

Problem

Linux DVB tuners should participate with minimal manual configuration. Requiring users to type linux-dvb and then fill out adapter, DVR, and channel options adds friction and hides available tuners from the "what can I watch right now" view.

Decision

On Linux only:

Auto-discover local DVB adapters by enumerating /dev/dvb/adapter*.
If a channels.conf is available, auto-expose each channel as a selectable stream in the main Channels list without requiring Add Stream input.
Support an explicit channels.conf override via EVERY_CHANNEL_DVB_CHANNELS_CONF to keep discovery deterministic and testable.

No scanning is introduced here. Auto-discovered channels come only from an existing channels.conf.

Details

Stream IDs use StreamKey { source: linux-dvb, device_id: adapterX:dvrY, channel: <name> } and remain a source-scope fallback until broadcast-scope IDs exist.
Tuning is performed via a dvbv5-zap command embedded into the linux-dvb:// URL (same mechanism as the Linux DVB picker).

Consequences

Linux nodes show their tuner channels "by default" when they already have a channels.conf, improving discoverability.
Non-Linux builds remain unchanged (no /dev/dvb, no auto-listed Linux DVB streams).

Alternatives Considered

Full frequency scan (dvbv5-scan) on first run: rejected for now because it is slow, region-dependent, and hard to test deterministically.
ioctl-based tuning: deferred until we can validate behavior across real hardware.

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