gistfile1.cs

private void ReadHeader()
        {
            var reader = new BinaryReader(_stream);
            if (ReadChunk(reader) != "RIFF")
            {
                throw new Exception("Invalid file format.");
            }

            reader.ReadInt32();

            if (ReadChunk(reader) != "WAVE")
            {
                throw new Exception("Invalid file format.");
            }

            if (ReadChunk(reader) != "fmt ")
            {
                throw new Exception("Invalid file format.");
            }

            int len = reader.ReadInt32();
            if (len < 16)
            {
                throw new Exception("Invalid file format.");
            }

            Format = new WaveFormat(22050, 16, 2)
            {
                Format = (WaveFormats) reader.ReadInt16(),
                Channels = reader.ReadInt16(),
                SamplesPerSec = reader.ReadInt32(),
                AvgBytesPerSec = reader.ReadInt32(),
                BlockAlign = reader.ReadInt16(),
                BitsPerSample = reader.ReadInt16()
            };

            len -= 16;
            while (len > 0)
            {
                reader.ReadByte();
                len--;
            }

            while (_stream.Position < _stream.Length && ReadChunk(reader) != "data")
            {
            }

            if (_stream.Position >= _stream.Length)
                throw new Exception("Invalid file format.");

            _length = reader.ReadInt32();
            _position = _stream.Position;

            if (_length <= 0)
            {
                throw new Exception("Invalid WAV file.");
            }

            if (Format.Format != WaveFormats.Pcm && Format.Format != WaveFormats.Float)
            {
                throw new Exception("Only PCM files are supported.");
            }