Convert an ulaw byte array to a wav array

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Hi,

i'm trying to convert a raw 8k,8bit,mono ulaw byte array to a 16k,16bit,mono wav array.
It works if i write the byte array to a .raw file and use pysox like this:

```python
tfm = sox.Transformer()
tfm.set_input_format(rate=8000, channels=1, encoding="u-law",bits=8)
tfm.set_output_format(channels=1, rate=16000,bits=16)

def convert(data):
f = open("randomfilename.raw", "wb")
f.write(data)
f.close()
return (tfm.build_array(input_filepath="randomfilename.raw"))
```

But pysox has the capabilities to use build_array with an input_array parameter, but I dont know how to convert my byte array, so that it works.

Could you please help me?

Start with the issue's Python example and inspect pysox's Transformer.build_array API, especially its input_array parameter and input format handling. Determine whether raw 8 kHz, 8-bit mono u-law bytes can be passed directly, and consider the conversion complete when the result is a 16 kHz, 16-bit mono WAV array without writing a temporary raw file.

Written by the indexing model from the issue text.