MPEG-4 HE-AAC v2 is the combination of Advanced Audio Coding (AAC), Spectral Band Replication (SBR) and Parametric Stereo (PS), standardized as the High-Efficiency v2 profile in MPEG-4 (HE AAC v2). SBR is a unique bandwidth extension technique which enables audio codecs to deliver the same quality at a significant bit rate reduction. PS is a coding tool that is able to capture a stereo signal as a monaural downmixed signal plus a limited number of parameters requiring low-overhead.
The HE-AAC v2 Encoder has been highly optimised to run on the Analog Devices' Blackfin processor family. It is a self-contained software module that is fully compliant with ISO/IEC 14496-3 MPEG-4 specification and rigorously tested and field-proven in commercial application. Through appropriate initialization, encoding can be made to perform in HE-AAC v2 mode (AAC+SBR+PS), or in HE-AAC v1 mode (AAC+SBR).
It contains a standard C-callable 'push' API with the added flexibility using 'pull' (or 'poll') by adding light wrapper code. The code has been implemented using Instruction and Data cache, and has no dependencies on processor peripherals and registers, adding greater system flexibility and ease of use.