public WaveFileWriter(string filename)
{
this.filename = filename;
outStream = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
writer = new BinaryWriter(outStream);
int dataChunkLength; //
long dataChunkPosition;
WaveFileReader.ReadWaveHeader(outStream, out format, out dataChunkPosition, out dataChunkLength, null);
dataSizePos = dataChunkPosition - 4;
overwriting = true;
}
public void TestEmptyFile()
{
// arrange
var fileContents = new byte[]
{
0x52, 0x49, 0x46, 0x46, // "RIFF"
0x26, 0x00, 0x00, 0x00, // ChunkSize = 38
0x57, 0x41, 0x56, 0x45, // "WAVE"
0x66, 0x6d, 0x74, 0x20, // "fmt "
0x12, 0x00, 0x00, 0x00, // Subchunk1Size = 18
0x07, 0x00, 0x02, 0x00, // AudioFormat = 7, NumChannels = 2
0x40, 0x1f, 0x00, 0x00, // SampleRate = 8000
0x80, 0x3e, 0x00, 0x00, // ByteRate = 16000
0x02, 0x00, 0x08, 0x00, // BlockAlign = 2, BitsPerSample = 8
0x00, 0x00, // ExtraParamSize = 0
0x64, 0x61, 0x74, 0x61, // "data"
0x00, 0x00, 0x00, 0x00, // Subchunk2Size = 0
};
using (var inputStream = new MemoryStream(fileContents))
{
// act
WaveFormat wv;
long dataChunkPosition;
int dataChunkLength;
var chunks = new List <RiffChunk>();
WaveFileReader.ReadWaveHeader(inputStream, out wv, out dataChunkPosition, out dataChunkLength, chunks);
// assert
Assert.AreEqual(16000, wv.AverageBytesPerSecond);
Assert.AreEqual(8, wv.BitsPerSample);
Assert.AreEqual(2, wv.Channels);
Assert.AreEqual(8000, wv.SampleRate);
Assert.AreEqual(46, dataChunkPosition);
Assert.AreEqual(0, dataChunkLength);
Assert.AreEqual(0, chunks.Count);
}
}
private static byte[] CheckForRiff(Stream input, BinaryReader reader, byte[] headerBytes)
{
if ((headerBytes[0] == 'R') &&
(headerBytes[1] == 'I') &&
(headerBytes[2] == 'F') &&
(headerBytes[3] == 'F'))
{
// Backup 4 bytes
input.Position -= 4;
// Now start parsing
WaveFormat format;
long dataChunkPosition;
int dataChunkLength;
WaveFileReader.ReadWaveHeader(input, out format, out dataChunkPosition, out dataChunkLength, null);
// Now read the actual mp3 header
input.Position = dataChunkPosition;
headerBytes = reader.ReadBytes(4);
}
return(headerBytes);
}
