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Overview

Vorbis is an audio compression format comparable to other formats used to store and play digital music, such as MP3 or AAC. It is different from these other formats because it is completely free, open, and the developers of the standard claim it is unpatented.

Benefits

Codecs are Fully Compliant: Bit exact thorough testing against standard and test vectors Codecs are Certified: E.g. codecs went through Dolby, Microsoft certification Robustness - no hanging: Codecs are thoroughly tested including floating inverted bits tests Error resilience: Dependent on standard, codecs fill gaps introduced by transmission errors Codecs developed in-house: Issues that may arise are quickly handled by Virage Logic s in-house DSP experts Tested using a large suite of bitstreams: From standard holder, in-house generated, live generated, from customers, etc.

Features

Implements the Vorbis audio decoder Supports typical and comprehensive profiles Supports all allowed bit rates Up to 255 channels decode Bit-depth of 16 bits per sample Block sizes:64 - 8192 samples Typical profile: 2 channels, 2048 block size Comprehensive profile: 8 channels, 8192 block size Includes Ogg container format reader

Deliverables

Datasheet lists features and characteristics Full C source code for ease of integration and further differentiation Test harness (runs out of box on FPGA or simulator) Run on ARC s XCAM cycle-accurate simulation models Quick and easy performance and I/O measurements Optimize core configuration: cache sizes & configuration, ICCM/DCCM size, busses, etc. Reference Design for multi-codec use cases available Integrated into ARC s Media Software Framework and MQX RTOS Codecs allow multiple instances to be run in parallel Documentation: Datasheet, Release Notes, Getting Started Guide, Reference Document, Code examples All Codecs developed, delivered and supported by Virage Logic staff

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