34 lines
1.6 KiB
C#
34 lines
1.6 KiB
C#
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using System.Runtime.InteropServices;
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// [UnmanagedCallersOnly] static methods for vc_callbacks.on_event/on_level — true native
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// function pointers, not GC-tracked delegates (avoids the classic P/Invoke pitfall where a
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// delegate is collected by the GC sometime after the call that registered it returns; see
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// docs/tech-stack.md §2). vc_callbacks.user is a GCHandle-wrapped VoiceCatClient (allocated in
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// VoiceCatClient's constructor, freed in Dispose) — these methods must be static, so they
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// resolve back to the right client instance via that handle rather than closing over state.
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namespace VoiceCat.Interop;
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internal static unsafe class NativeCallbacks
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{
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[UnmanagedCallersOnly]
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internal static void OnEvent(IntPtr userContext, VcEventNative* ev)
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{
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if (userContext == IntPtr.Zero) return;
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if (GCHandle.FromIntPtr(userContext).Target is not VoiceCatClient client) return;
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// CRITICAL (voicecat.h's vc_event doc comment): ev->Text is owned by the core and
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// valid ONLY for the duration of this callback. Convert to a managed string NOW,
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// before returning — never store/queue the raw VcEventNative across the callback
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// boundary, or Text will be a dangling pointer by the time it's read.
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client.EnqueueEvent(VoiceCatEvent.FromNative(*ev));
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}
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[UnmanagedCallersOnly]
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internal static void OnLevel(IntPtr userContext, uint streamId, float rms)
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{
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if (userContext == IntPtr.Zero) return;
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if (GCHandle.FromIntPtr(userContext).Target is not VoiceCatClient client) return;
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client.EnqueueLevel(streamId, rms);
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}
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}
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