/// <summary>
/// 合并Wave文件
/// </summary>
/// <param name="inputWaveFiles">需要合并的Wave文件数组</param>
/// <param name="outputWaveFile">合并后的Wave文件</param>
public static void MergeWav(string[] inputWaveFiles, string outputWaveFile)
{
if (inputWaveFiles.Length < 1)
{
return;
}
FileStream fsInput = new FileStream(inputWaveFiles[0], FileMode.Open, FileAccess.Read);
FileStream fsOutput = new FileStream(outputWaveFile, FileMode.Create, FileAccess.Write);
byte[] buffer = new byte[2048];
int total = 0;
int count;
while ((count = fsInput.Read(buffer, 0, buffer.Length)) > 0)
{
fsOutput.Write(buffer, 0, count);
total += count;
}
fsInput.Close();
for (int i = 1; i < inputWaveFiles.Length; i++)
{
string file = inputWaveFiles[i];
WaveHeaderInfo header = ResolveHeader(file);
FileStream dataInputStream = header.DataInputStream;
while ((count = dataInputStream.Read(buffer, 0, buffer.Length)) > 0)
{
fsOutput.Write(buffer, 0, count);
total += count;
}
dataInputStream.Close();
}
fsOutput.Flush();
fsOutput.Close();
WaveHeaderInfo outputHeader = ResolveHeader(outputWaveFile);
outputHeader.DataInputStream.Close();
FileStream fs = new FileStream(outputWaveFile, FileMode.Open, FileAccess.ReadWrite);
fs.Seek(4, SeekOrigin.Begin);
byte[] fileLen = IntToBytes(total + outputHeader.DataOffset - 8);
fs.Write(fileLen, 0, 4);
fs.Seek(outputHeader.DataSizeOffset, SeekOrigin.Begin);
byte[] dataLen = IntToBytes(total);
fs.Write(dataLen, 0, 4);
fs.Close();
}
/// <summary>
/// 解析头部，并获得文件指针指向数据开始位置的InputStreram
/// </summary>
/// <param name="wavFile">文件全路径名称</param>
/// <returns></returns>
private static WaveHeaderInfo ResolveHeader(string wavFile)
{
FileStream fs = new FileStream(wavFile, FileMode.Open, FileAccess.Read);
byte[] byte4 = new byte[4];
byte[] buffer = new byte[2048];
int readCount = 0;
WaveHeaderInfo waveHeader = new WaveHeaderInfo();
fs.Read(byte4, 0, byte4.Length); //RIFF
fs.Read(byte4, 0, byte4.Length);
readCount += 8;
waveHeader.FileSizeOffset = 4;
waveHeader.FileSize = BytesToInt(byte4);
fs.Read(byte4, 0, byte4.Length); //WAVE
fs.Read(byte4, 0, byte4.Length); //fmt
fs.Read(byte4, 0, byte4.Length);
readCount += 12;
int fmtLen = BytesToInt(byte4);
fs.Read(buffer, 0, fmtLen);
readCount += fmtLen;
fs.Read(byte4, 0, byte4.Length); //data or fact
readCount += 4;
if (IsFmt(byte4, 0))
{
//包含fmt段
fs.Read(byte4, 0, byte4.Length);
int factLen = BytesToInt(byte4);
fs.Read(buffer, 0, factLen);
fs.Read(byte4, 0, byte4.Length); //data
readCount += 8 + factLen;
}
fs.Read(byte4, 0, byte4.Length); //data size
int dataLen = BytesToInt(byte4);
waveHeader.DataSize = dataLen;
waveHeader.DataSizeOffset = readCount;
readCount += 4;
waveHeader.DataOffset = readCount;
waveHeader.DataInputStream = fs;
return(waveHeader);
}
