This application report introduces and describes an MP3/AAC audio player for use with theTMS320C54x digital signal processor (DSP) devices. This audio player is based on ReferenceFramework Level 3 (RF3). Reference Framework for eXpressDSP Software is a startwarefor developing applications that use DSP/BIOS and the TMS320 DSP AlgorithmStandard.The main challenge of this application is to use LIO-based drivers for bitstream input andpulse code modulation (PCM) output. There is a large variety of input/output (I/O) devices.This approach provides great code reusability. As a result, developers can adapt this applicationfor their own systems with minimum efforts.This document also describes a number of DSP/BIOS techniques for decompressionapplications.MP3: ISO-MPEG Audio Layer-3 standard (ISO/IEC 11172-3, 13818-3)AAC: ISO-MPEG2 Advanced Audio Coding standard (ISO/IEC 13818-7)……