WAV File input
Table of Contents
The WAV is very popular format to store uncompressed audio as file. Currently WaveBeans supports only files with single channel – mono. The sampling rate and bit depth can be any.
Worth to mention, wav-input doesn’t support resampling internally, so it should correspond with stream sample rate or be resampled.
Also as any stream in WaveBeans considered to be infinite and wav-file is not, to apply full API capabilities you would need to convert it using finite-converters
Syntax
To read the file it is as easy as call the function wave, currently only full URLs are supported, so in order to specify file in the local file system you would need to specify protocol file:// and then absolute path for the file. Please be aware that the name and path of the file is OS dependent and might be even case-sensitive.
wave("file:///path/to/file.wav") // for unix-like systems
wave("file://c:\\path\\to\\file.wav") // for windows systems
Using that API we can convert the file to infinite stream by defining the strategy for reading data when it’s got rolled out, in this case we’ll just fill the stream with zeros when the main stream is over:
wave("file:///path/to/file.wav", ZeroFilling())
Resampling
The wav-file can be sampled at any sample rate, you may not know beforehand what exactly it might be. For convenience that output is automatically resampled with sinc interpolation method. You can define your own by specifying the resampling function as a resampleFn parameters. To disable the implicit resampling specify resampleFn parameter as null.
Low-level API
As any other stream in the system, API mentioned above is just a wrapper around classes which handle all the logic. To create an instance with the same effect you would need to to this:
import java.net.URI
WavInput(WavFiniteInputParams(
uri = URI("file:///path/to/file.wav")
))
That input implements io.wavebeans.lib.io.FiniteStream<Sample> interface, it can be converted into infinite stream with finite-converter.