intの配列からモノラルのwavを作る

wavexport.hpp

#pragma once
#include <vector>
#include <iostream>
#include <fstream>

namespace wav
{
	struct Header
	{
		char riff[4] = { 'R', 'I', 'F', 'F' };
		unsigned long fileSize;		// 36足す
		char wave[4] = { 'W', 'A', 'V', 'E' };

		char format[4] = { 'f', 'm', 't', ' ' };
		unsigned long formatSize = 16;
		unsigned short formatCode = 1;		// 16bit pcm
		unsigned short numChannels = 1;		// mono
		unsigned long samplingRate = 44100;
		unsigned long bytePerSec = 44100 * 2;
		unsigned short blockSize = 2;
		unsigned short bitsPerSample = 16;

		char data[4] = { 'd', 'a', 't', 'a' };
		unsigned long dataSize;
	};

	class Wave
	{
	public:
		Wave() {}

		void SaveMono(const std::wstring& path, const std::vector<int>& stream)
		{
			Header header;
			header.dataSize = stream.size() * sizeof(int);
			header.fileSize = header.dataSize + 36;

			std::ofstream ofst;
			ofst.open(path, std::ios::out | std::ios::binary);
			ofst.write((char*)&header, 44);
			
			for (int i = 0; i < stream.size(); ++i)
			{
				short d = (short)(stream[i] >> 8);
				ofst.write((char*)&d, 2);
			}

			ofst.close();
		}
	};
}