internal unsafe void SaveAsWaveFile(string filePath)
{
const int chunkSize = 4096;
FileStream file = null;
IntPtr data = IntPtr.Zero;
try
{
// Create the file
file = new FileStream(filePath, FileMode.Create, FileAccess.Write);
// Alocate memory for the PCM data buffer
data = Marshal.AllocHGlobal(chunkSize);
// Create a holding buffer that the PCM data will be copied into
byte[] buffer = new byte[chunkSize];
uint totalSize = 0;
uint bytesRead = 0;
// Get the length of the sound in PCM bytes
this.LengthUnit = TimeUnits.PcmByte;
uint pcmLength = this.FmodLength;
// Create the WAV structures
FmtChunk fmtChunk = new FmtChunk();
DataChunk dataChunk = new DataChunk();
WavHeader wavHeader = new WavHeader();
RiffChunk riffChunk = new RiffChunk();
fmtChunk.Chunk = new RiffChunk();
fmtChunk.Chunk.Id = new char[4] { 'f', 'm', 't', ' ' };
fmtChunk.Chunk.Size = Marshal.SizeOf(fmtChunk) - Marshal.SizeOf(riffChunk);
fmtChunk.FormatTag = 1;
fmtChunk.NumberOfChannels = (ushort)this.NumberOfChannels;
fmtChunk.SamplesPerSecond = (uint)this.DefaultSettings.Frequency;
fmtChunk.AverageBytesPerSecond = (uint)(this.DefaultSettings.Frequency * this.NumberOfChannels * this.NumberOfBitsPerSample / 8);
fmtChunk.BlockSize = (ushort)(1 * this.NumberOfChannels * this.NumberOfBitsPerSample / 8);
fmtChunk.NumberOfBitsPerSample = (ushort)this.NumberOfBitsPerSample;
dataChunk.Chunk = new RiffChunk();
dataChunk.Chunk.Id = new char[4] { 'd', 'a', 't', 'a' };
dataChunk.Chunk.Size = (int)pcmLength;
wavHeader.Chunk = new RiffChunk();
wavHeader.Chunk.Id = new char[4] { 'R', 'I', 'F', 'F' };
wavHeader.Chunk.Size = (int)(Marshal.SizeOf(fmtChunk) + Marshal.SizeOf(riffChunk) + pcmLength);
wavHeader.RiffType = new char[4] { 'W', 'A', 'V', 'E' };
// Write out the WAV header.
IntPtr wavHeaderPtr = Marshal.AllocHGlobal(Marshal.SizeOf(wavHeader));
IntPtr fmtChunkPtr = Marshal.AllocHGlobal(Marshal.SizeOf(fmtChunk));
IntPtr dataChunkPtr = Marshal.AllocHGlobal(Marshal.SizeOf(dataChunk));
byte[] wavHeaderBytes = new byte[Marshal.SizeOf(wavHeader)];
byte[] fmtChunkBytes = new byte[Marshal.SizeOf(fmtChunk)];
byte[] dataChunkBytes = new byte[Marshal.SizeOf(dataChunk)];
Marshal.StructureToPtr(wavHeader, wavHeaderPtr, false);
Marshal.Copy(wavHeaderPtr, wavHeaderBytes, 0, Marshal.SizeOf(wavHeader));
Marshal.StructureToPtr(fmtChunk, fmtChunkPtr, false);
Marshal.Copy(fmtChunkPtr, fmtChunkBytes, 0, Marshal.SizeOf(fmtChunk));
Marshal.StructureToPtr(dataChunk, dataChunkPtr, false);
Marshal.Copy(dataChunkPtr, dataChunkBytes, 0, Marshal.SizeOf(dataChunk));
file.Write(wavHeaderBytes, 0, Marshal.SizeOf(wavHeader));
file.Write(fmtChunkBytes, 0, Marshal.SizeOf(fmtChunk));
file.Write(dataChunkBytes, 0, Marshal.SizeOf(dataChunk));
do
{
// Read PCM data from the sound
bytesRead = Read(data, chunkSize);
// Copy the PCM data into the buffer
Marshal.Copy(data, buffer, 0, chunkSize);
// Write the PCM data to the FileStream
file.Write(buffer, 0, (int)bytesRead);
// Increment totalRead
totalSize += bytesRead;
}
while (currentResult == Result.Ok && bytesRead == chunkSize);
//file.Close();
}
catch (Exception ex)
{
throw new ApplicationException("There was an error saving this sound to " + filePath + " : " + currentResult.ToString() + ":" + ex.Message, ex);
}
finally
{
// Always free the data pointer
if (data != IntPtr.Zero) Marshal.FreeHGlobal(data);
// Always close the file
if (file != null) file.Close();
}
}