AudioConvert converts generated wav file from tts to other output formats.

AudioToWav converts audio to wav for transcribe.

GetContentURIAsBase64 checks if the string is an URL, if it's an URL downloads the content in memory encodes it in base64 and returns the base64 string, otherwise returns the string by stripping base64 data headers.

SanitizeFileName sanitizes the given filename.

VerifyPath verifies that path is based in basePath.