StimBuff: Make virtual so we can dynamic_cast in getOrCreateStimBuff

include/user/stimulusBuffer.h

@@ -39,7 +39,7 @@ public:
 		ringBufferConstraints)
 	{}
 
-	~StimulusBuffer() = default;
+	virtual ~StimulusBuffer() = default;
 
 	// Non-copyable, movable
 	StimulusBuffer(const StimulusBuffer&) = delete;

include/user/stimulusProducer.h

@@ -69,13 +69,16 @@ public:
 	void allowNextStimulusFrame()
 		{ frameAssemblyRateLimiter.release(); }
 
-	std::shared_ptr<StimulusBuffer> getAttachedStimulusBuffer(
+	virtual std::shared_ptr<StimulusBuffer> getAttachedStimulusBuffer(
 		const std::shared_ptr<device::DeviceAttachmentSpec>& spec) const;
 
 	virtual std::shared_ptr<StimulusBuffer> getOrCreateAttachedStimulusBuffer(
 		const std::shared_ptr<device::DeviceAttachmentSpec>& deviceAttachmentSpec,
 		int histbuffMs) = 0;
 
+	// Check if any attached buffer has the specified qualeIfaceApi
+	bool hasBufferWithQualeIfaceApi(const std::string& qualeIfaceApi) const;
+
 protected:
 	SpinLock frameAssemblyRateLimiter;