Wednesday – 11:00-11:45
Convention Ctr - Exhibit Hall 4A

2 – CLAM: An OO Framework for Developing Audio and Music Applications

Xavier Amatriain
Music Technology Group - UPF

CLAM (C++ Library for Audio and Music) is a framework for developing cross-platform applications and research works in the audio and music domain. The framework offers general infrastructure and services that dramatically improve development speed and final code quality, thus enhancing re-usability and portability.

In the CLAM framework data types as well as processing and flow control entities are objects that respond to a well-defined and clean interface. For doing so we have had to fight against a well established idea in the DSP community: well structured code compromises run-time performance.

CLAM is unique and different to other existing solutions in many senses: it is more OO, it is written in C++, it is cross-platform, it is Free Software and it is efficient.

For implementing CLAM services the multiparadigm nature of the C++ programming language has been exploited. OO techniques have been combined with template metaprogramming, static dispatching or C-like macros to reduce the programmer's effort.

The demo will consist of the execution of some sample applications such as:

• Spectral Delay: Real-time multiband delay
• Rapidd: A real-time application that may be used in live performances
• Analysis/Synthesis: an offline application for spectral analysis, synthesis and transformations.
• Salto: A real-time midi-controlled sax synthesizer

Some of CLAM's main features will also be illustrated:

• Platform abstraction for audio and midi i/o, multithreading and application development.
• Generic implementation of data classes with the ability to dynamically instantiate attributes and derive a common interface.
• XML serialization of any data object.
• Debugging tools.
• Synchronous flow for data vs. asynchronous flux for controls