Padding transform

[iver56]

This transform takes a fraction of the end or the start of the audio and treats that part as padding. We can implement several modes:

• [x] constant (zero)
• [ ] wrap
• [ ] reflect

[iver56]

This idea has been implemented in audiomentations recently:

https://github.com/iver56/audiomentations/blob/master/audiomentations/augmentations/padding.py

To get a deeper understanding of this, it's also useful to run the demo script in audiomentations and listen to the outputs

This issue is about implementing it in pytorch for torch-audiomentations :)