XMA audio format
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XMA is the native Xbox 360 compressed audio format, based on the WMA Pro architecture. XMA provides sound quality higher than ADPCM at even better compression ratios, typically 6:1–12:1.
[edit] Implementation
The Xbox 360 system Southbridge contains a full silicon implementation of the XMA decompression algorithm, including support for multichannel XMA sources. XMA is processed by the south bridge into standard PCM format in RAM. All other sound processing (sample rate conversion, filtering, effects, mixing, and multispeaker encoding) happens on the Xenon CPU. The lowest-level Xbox 360 audio software layer is XAudio, a new API designed for optimal digital signal processing. The Xbox Audio Creation Tool XACT API from XNA is also supported, along with new features such as conditional events, improved parameter control, and a more flexible 3D audio model.
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