private byte[] MakeWaveHader(int data_count, int channels, int rate, int bps)
{
var data_size = data_count * (bps / 8) * channels;
var file_size = data_size + 36;
var riff = new RiffHeader();
riff.riff_head = GetBytes("RIFF");
riff.file_size = (uint)file_size;
riff.riff_type = GetBytes("WAVE");
var fmt = new RiffFormatChunk();
fmt.chunkID = GetBytes("fmt ");
fmt.chunkSize = 16;
fmt.wFormatTag = 1;
fmt.wChannels = (ushort)channels;
fmt.dwSamplesPerSec = (uint)rate;
fmt.dwAvgBytesPerSec = (uint)(rate * (bps / 8) * channels);
fmt.wBlockAlign = (ushort)((bps / 8) * channels);
fmt.wBitsPerSample = (ushort)bps;
var data = new RiffDataChunk();
data.head = GetBytes("data");
data.size = (uint)data_size;
var size = Marshal.SizeOf(riff) + Marshal.SizeOf(fmt) + Marshal.SizeOf(data);
var riff_ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(riff, riff_ptr, false);
var fmt_ptr = new IntPtr(riff_ptr.ToInt32() + Marshal.SizeOf(riff));
Marshal.StructureToPtr(fmt, fmt_ptr, false);
var data_ptr = new IntPtr(fmt_ptr.ToInt32() + Marshal.SizeOf(fmt));
Marshal.StructureToPtr(data, data_ptr, false);
var header = new byte[size];
Marshal.Copy(riff_ptr, header, 0, size);
Marshal.FreeHGlobal(riff_ptr);
// Marshal.FreeHGlobal(fmt_ptr); //riff_ptrを開放すると同時に開放されるので不要
// Marshal.FreeHGlobal(data_ptr); //riff_ptrを開放すると同時に開放されるので不要
return(header);
}
public static RiffHeader GetRiffHeader(Stream stream)
{
var id = new byte[4];
stream.Read(id, 0, id.Length);
while (Encoding.ASCII.GetString(id) != "RIFF")
{
stream.Position -= 3;
stream.Read(id, 0, id.Length);
}
stream.Position -= 4;
var header = new RiffHeader();
var rawData = new byte[12];
stream.Read(rawData, 0, rawData.Length);
header.ID = Encoding.ASCII.GetString(rawData.Take(4).ToArray());
header.Size = BitConverter.ToUInt32(rawData.Skip(4).Take(4).ToArray(), 0);
header.Format = Encoding.ASCII.GetString(rawData.Skip(8).ToArray());
return(header);
}
/// <summary>
/// Creates a RIFF object with data from the given RIFF-compatable stream.
/// </summary>
/// <param name="input">a stream containing RIFF data</param>
public RIFF(Stream input)
{
if (!input.CanRead)
{
throw new ArgumentException("The RIFF parser requires a readable stream.", "input");
}
long initial = input.Position;
int headerLength = Marshal.SizeOf(typeof(RiffHeader));
int innerHeaderLength = Marshal.SizeOf(typeof(RiffBlockHeader));
byte[] data = new byte[headerLength];
input.Read(data, 0, headerLength);
header = Reinterpret.Memory <RiffHeader>(data);
blocks = new List <RiffBlock>();
while (input.Position - initial < header.HeaderBlockHeader.Length + innerHeaderLength)
{
blocks.Add(new RiffBlock(input));
}
}
/* #region Private Methods */
private void ReadHeader()
{
//See here: http://soundfile.sapp.org/doc/WaveFormat/
var firstBytes = new byte[36];
this.FileStream.Read(firstBytes, 0, 36);
this.FileStream.Seek(0, SeekOrigin.Begin);
var riffHeader = ReadASCII(4);
var chunkLen = ReadUInt32();
var format = ReadASCII(4);
var subChunk1Id = ReadASCII(4);
var subChunk1Size = ReadUInt32();
var audioFmt = ReadUInt16();
var numChannels = ReadUInt16();
var sampleRate = ReadUInt32();
var byteRate = ReadUInt32(); //== SampleRate * NumChannels * BitsPerSample / 8
var blockAlign = ReadUInt16();
var bitsPerSample = ReadUInt16();
var retval = new RiffHeader()
{
Bytes = firstBytes,
RIFFHeader = riffHeader,
ChunkLength = chunkLen,
Format = format,
AudioFormat = audioFmt,
NumChannels = numChannels,
SampleRate = sampleRate,
ByteRate = byteRate,
BlockAlign = blockAlign,
BitsPerSample = bitsPerSample
};
this.RiffHeader = retval;
}
public WaveFile(string fileName)
{
var stream = File.OpenRead(fileName);
RiffHeader = RiffHeader.GetRiffHeader(stream);
var pos = stream.Position;
FormatChunk = FormatChunk.GetFormatChunk(stream);
stream.Position = pos + FormatChunk.Size + 8;
DataChunk = DataChunk.GetDataChunk(stream);
//if (stream.Length < 12 + 8 + FormatChunk.Size + 8 + DataChunk.Size) throw new InvalidDataException("The Wave file format is invalid.")
Data = new short[DataChunk.Size / 2];
byte[] bytes = new byte[DataChunk.Size];
stream.Read(bytes, 0, bytes.Length);
stream.Dispose();
for (int i = 0; i < Data.Length; i++)
{
Data[i] = BitConverter.ToInt16(new byte[2] {
bytes[2 * i], bytes[2 * i + 1]
}, 0);
}
}
/// <summary>
/// Creates an empty RIFF container file.
/// </summary>
/// <param name="type">a fourcc typecode to embed in the header</param>
public RIFF(string type)
{
header = new RiffHeader(Reinterpret.FourCC(type, ByteOrder.BigEndian));
blocks = new List <RiffBlock>();
}
