A2B: Add A2B message initial support

include/icsneo/communication/message/a2bmessage.h

@@ -0,0 +1,140 @@
+#ifndef __A2BMESSAGE_H_
+#define __A2BMESSAGE_H_
+
+#ifdef __cplusplus
+
+#include "icsneo/communication/message/message.h"
+
+#define A2BMESSAGE_UPSTREAM 1
+#define A2BMESSAGE_DOWNSTREAM 0
+
+#define A2BPCM_L16 16
+#define A2BPCM_L24 24
+
+#define A2BPCM_SAMPLERATE_44100 44100
+#define A2BPCM_SAMPLERATE_48000 48000
+
+namespace icsneo
+{
+
+typedef uint32_t A2BPCMSample;
+typedef std::vector<A2BPCMSample> ChannelBuffer;
+
+class A2BMessage : public Frame
+{
+public:
+	enum class A2BDirection : uint8_t
+	{
+		DownStream = 0,
+		UpStream = 1
+	};
+
+	A2BMessage() = delete;
+
+	A2BMessage(uint8_t bitDepth, uint8_t bytesPerSample, uint8_t numChannels, bool monitor) : 
+		mBitDepth(bitDepth), 
+		mBytesPerSample(bytesPerSample),
+		mMonitor(monitor)
+	{
+		downstream.resize(numChannels);
+		upstream.resize(numChannels);
+	}
+
+	void addSample(A2BPCMSample &&sample, A2BDirection dir, uint8_t channel)
+	{
+		if(dir == A2BDirection::DownStream)
+		{
+			downstream[channel].push_back(std::move(sample));
+		}
+		else
+		{
+			upstream[channel].push_back(std::move(sample));
+		}
+		totalSamples++;
+	}
+
+	const A2BPCMSample *getSamples(A2BDirection dir, uint8_t channel) const
+	{
+		if(channel >= getNumChannels())
+		{
+			return nullptr;
+		}
+
+		if(dir == A2BDirection::DownStream)
+		{
+			return downstream[channel].data();
+		}
+		return upstream[channel].data();
+	}
+
+	std::optional<A2BPCMSample> getSample(A2BDirection dir, uint8_t channel, uint32_t sampleIndex) const
+	{
+		const A2BPCMSample *samples = getSamples(dir, channel);
+		auto numSamplesInChannel = getNumSamplesInChannel(dir, channel);
+
+		if(
+			samples == nullptr ||
+			sampleIndex >= numSamplesInChannel.value_or(0)
+		)
+		{
+			return std::nullopt;
+		}
+
+		return samples[sampleIndex];
+	}
+
+	std::optional<std::size_t> getNumSamplesInChannel(A2BDirection dir, uint8_t channel) const
+	{
+		if(channel >= getNumChannels())
+		{
+			return std::nullopt;
+		}
+
+		if(dir == A2BDirection::DownStream)
+		{
+			return downstream[channel].size();
+		}
+
+		return upstream[channel].size();
+	}
+
+	size_t getNumSamples() const
+	{
+		return totalSamples;
+	}
+
+	uint8_t getNumChannels() const
+	{
+		return static_cast<uint8_t>(downstream.size());
+	}
+
+	uint8_t getBitDepth() const
+	{
+		return mBitDepth;
+	}
+
+	uint8_t getBytesPerSample() const
+	{
+		return mBytesPerSample;
+	}
+
+	bool isMonitor() const
+	{
+		return mMonitor;
+	}
+
+private:
+	std::vector<ChannelBuffer> downstream;
+	std::vector<ChannelBuffer> upstream;
+	size_t totalSamples = 0;
+	
+	uint8_t mBitDepth;
+	uint8_t mBytesPerSample;
+	bool mMonitor;
+};
+
+}
+
+#endif // __cplusplus
+
+#endif