A2B: Add initial WAV streaming support

include/icsneo/communication/message/callback/streamoutput/a2bwavoutput.h

@@ -0,0 +1,47 @@
+#ifndef __A2BWAVOUTPUT_H_
+#define __A2BWAVOUTPUT_H_
+
+#ifdef __cplusplus
+
+#include "icsneo/communication/message/callback/streamoutput/streamoutput.h"
+#include "icsneo/communication/message/a2bmessage.h"
+#include <memory>
+#include <functional>
+
+namespace icsneo {
+
+class A2BWAVOutput : public StreamOutput {
+public:
+	A2BWAVOutput(const char* filename, uint32_t sampleRate = A2BPCM_SAMPLERATE_44100) 
+		: wavSampleRate(sampleRate), StreamOutput(filename) {}
+
+	A2BWAVOutput(std::unique_ptr<std::ostream>&& os, uint32_t sampleRate = A2BPCM_SAMPLERATE_44100) 
+		: wavSampleRate(sampleRate), StreamOutput(std::move(os)) {}
+
+	void writeHeader(const std::shared_ptr<A2BMessage>& firstMsg) const;
+
+	bool callIfMatch(const std::shared_ptr<Message>& message) const override;
+
+	void close() const;
+
+	~A2BWAVOutput() {
+		if(!closed) {
+			close();
+		}
+	}
+
+protected:
+
+	bool writeSamples(const std::shared_ptr<A2BMessage>& msg, A2BMessage::A2BDirection dir) const;
+
+	uint32_t wavSampleRate;
+	mutable uint32_t streamStartPos;
+	mutable bool firstMessageFlag = true;
+	mutable bool closed = false;
+};
+
+}
+
+#endif // __cplusplus
+
+#endif