MPEG-4 aacPlus v2 Decoders for Xtensa HiFi Audio DSP

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Tensilica’s MPEG-4 aacPlus v2 Decoder Application PackagesCoding Technologies logo

The MPEG-4 aacPlusTM v2 Decoder packagse for the Xtensa HiFi Audio DSPs implements 24-bit MPEG-4 aacPlus v2 decoding compliant with ISO/IEC 14496-3 and the 3GPP specification for Enhanced aacPlus, supporting AAC, PS (Parametric Stereo), and Spectral Band Replication (SBRTM) in mono and stereo configurations or in a multi-channel configuration supporting up to 7.1 channels.

The decoders are a fixed-point implementation written in C and available in either object or source code. Included documentation describes how to incorporate the decoder into a system. Using this package, system developers can integrate an MPEG-4 aacPlus v2 decoder into an SOC without the need for additional optimizations or software development. The same Xtensa HiFi Audio DSPs are used for other Tensilica audio codecs, enabling the development of highly optimized multi-standard audio SOC designs.

Feature Summary

  • Support for Parametric Stereo and Spectral Band Replication
  • Compliant with ISO/IEC 14496-3 and the 3GPP specifications for Enhanced aacPlus
  • One version for stereo (2-channel); another version for multi-channel up to 7.1 channels

Specifications for Stereo without LOAS


Decoder
Clock Rate*
Code Size (ROM)
Table Size (ROM)
RAM**
I/O Buffer RAM
48 Kbps, 48 KHz 19 MHz 71 Kbytes 33 Kbytes 52 Kbytes 18 Kbytes
64 Kbps, 48 KHz 20 MHz 71 Kbytes 33 Kbytes 52 Kbytes 18 Kbytes

* Average MHz (clock rate) required for single-cycle memory.
** RAM includes persistent, stack and scratch.

aacPlus and SBR are trademarks of Coding Technologies and Coding Technologies reserves all rights to these names.

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