Piper is a protocol for audio analysis and feature extraction. That is, the task of processing sampled audio data to produce descriptive output (measurements or semantic observations).
Piper defines a data schema and API that can be used for remote audio feature extraction services, or for feature extractors loaded directly into a host application.
Piper is intended to be used
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as a programmatic interface for audio analysis and feature extraction methods for web applications and servers
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to make Vamp plugins, and feature extractors written in other languages such as Javascript, available through a service API or as loadable modules
The Piper schema is language- and serialisation-independent and the API is transport-independent. We provide initial implementations using JSON in Javascript and C++, and using Cap'n Proto in C++.
This repository contains the basic Piper schema. Implementations and utilities can be found in neighbouring repositories.
The basic Piper schema is now in "shipping" state: it may be extended in future, but always in ways that retain compatibility with existing systems.
Piper was made by Lucas Thompson and Chris Cannam at the Centre for Digital Music, Queen Mary, University of London.
Copyright (c) 2015-2017 Queen Mary, University of London, provided under a BSD-style licence. See the file COPYING for details.