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Codecs that share an A2DP endpoint (e.g. aac + aac_eld) previously used an asymmetric pattern: one codec (the "owner") had fill_caps and quietly advertised the union of all siblings' capability bits; companions had fill_caps = NULL. This caused a bug: when aac_eld is absent from bluez5.codecs, the "aac" endpoint still advertised the ELD object-type bit because a2dp_codec_aac's fill_caps emitted it unconditionally (gated only by eld_supported(), never by enabled_codecs). A remote could then select ELD; SetConfiguration resolved the transport to a2dp_codec_aac (the only fill_caps holder for "aac") Refactor to a symmetric, composable model: - Add bool endpoint_companion to struct media_codec (default false = owner). Companion codec objects set this flag instead of fill_caps = NULL. - Add combine_caps() function to struct media_codec. Owners that share an endpoint implement this to union two capability blobs of the same codec_id. - Each codec's fill_caps now describes only its own bits. AAC LC advertises only LC object types; AAC ELD advertises only the ELD type (or returns -ENOTSUP when FDK-AAC lacks ELD support). - Bump SPA_VERSION_BLUEZ5_CODEC_MEDIA 16 -> 17. On the monitor side (bluez5-dbus.c): - New media_codec_fill_endpoint_caps() helper fills the owner's caps then walks enabled companions on the same endpoint and merges each via combine_caps. All five endpoint-registration fill_caps call sites are routed through this helper. - endpoint_should_be_registered() gates on !endpoint_companion (not on fill_caps != NULL), so companions correctly skip endpoint registration. - media_endpoint_to_codec() now filters by is_media_codec_enabled and prefers owners as a tiebreaker. - New media_endpoint_to_codec_for_config() resolves SetConfiguration by calling each enabled candidate's validate_config against the negotiated config bytes. This ensures that an "aac" endpoint carrying ELD bytes is mapped to a2dp_codec_aac_eld (not a2dp_codec_aac). - AAC validate_config and codec_init are id-gated so a stale ELD config can never be decoded by the LC codec object. Assisted-by: Claude Opus 4.7 |
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