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AUv3: stop asking the host to release a parameter name it never owned #540

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Merged
defiantnerd merged 1 commit into from
Sep 13, 2026
Merged

AUv3: stop asking the host to release a parameter name it never owned #540

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8 changes: 6 additions & 2 deletions src/detail/auv3/auv3_parameters.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -92,9 +92,13 @@ ParameterTreeResult createParameterTree(const clap_plugin_t *plugin, const clap_

// Determine AU parameter unit
AudioUnitParameterUnit unit = kAudioUnitParameterUnit_Generic;
// no CFName flags here: CFNameRelease hands the host ownership of the CFStringRef, and
// the AUv3 to v2 bridge fills that field from the AUParameter's displayName without a
// matching retain, so an honouring host over-releases a string it never owned. The AUv2
// wrapper can set the pair because it CFRetains the string itself; here there is no such
// hook. HasCFNameString goes too, since it only means anything alongside that contract.
AudioUnitParameterOptions flags =
kAudioUnitParameterFlag_IsReadable | kAudioUnitParameterFlag_IsHighResolution |
kAudioUnitParameterFlag_HasCFNameString | kAudioUnitParameterFlag_CFNameRelease;
kAudioUnitParameterFlag_IsReadable | kAudioUnitParameterFlag_IsHighResolution;

bool isStepped = (info.flags & CLAP_PARAM_IS_STEPPED) != 0;
bool isHidden = (info.flags & CLAP_PARAM_IS_HIDDEN) != 0;
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