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MPEG-4 AAC-LC Decoder

Product Details

This library for the SHARC processor is an implementation of the MPEG-4 AAC-LC (Low Complexity Advanced Audio Coding) decoder, which is conformant to the standard defined by ISO/IEC in MPEG-4 Audio. This version will support multi-channel audio (up to 6 output channels).

Features

  • Transport Stream: External parsing for ADTS, ADIF, and MP4 file format. Parsers are supplied by ADI.
  • Output Status: Sample rate, number of output channels, etc.
  • Fast Forward / Rewind: Resynchronization function provided to allow the user to seek to and continue playback from random access points.
  • Extended Test Vector Testing: Compliant with ISO/IEC test vectors and additional test vectors with unusual content.
  • Error Codes: Reports up to 9 unique error codes, such as input buffer underflow and non-supported streams.
  • Software Quality Standard: A report on the level of MISRA-C compliance for this module is available upon request.
  • Target Processor: Code compatible across the SHARC ADSP-213xx and ADSP-214xx processors
  • Conformance Standard: ISO/IEC 14496-3 (MPEG-4) AAC Profile at Level 5
  • Reference Code Revision: ISO/IEC 14496-5:2001, March 2006
  • Framework dependencies: None
  • Release format: Object code module with C source wrapper
  • Input format: Supports streams with MPEG-2 AAC-LC profile (ISO/IEC 13818-7) and MPEG-4 AAC-LC audio object (ISO/IEC 14496-3: 2005)
  • Bit Rate: All bit rates specified by standard
  • Output format: Supports up to 6 channels of 32-bit floating point (IEEE-754) PCM (normalized to within the range of -1.0 and +1.0), with configurable output buffer location (separate non-interleaved channel buffers)
  • Sample Rate: All sample frequencies (up to 96 kHz) specified by the standard ISO/IEC 14496-3
  • Multi-threading: Fully re-entrant and multi-instancing capable

Product Downloads

System Requirements

  • Windows XP Professional SP3 (32-bit only).
  • Windows Vista Business/Enterprise/Ultimate SP2 (32-bit only). It is recommended to install the software in a non-UAC-protected location.
  • Windows 7 Professional/Enterprise/Ultimate (32 and 64-bit). It is recommended to install the software in a non-UAC-protected location.
  • Minimum of 2 GHz single core processor, 3.3 GHz dual core is recommended.
  • Minimum of 1 GB memory (RAM), 4 GB is recommended.
  • Minimum of 2 GB hard disk (HDD) space is required.

Related Software 

Related Hardware

Performance Metrics

MIPS summary:

SHARC Processor Code memory (KiB) Data RAM (KiB) Constant Data Tables (KiB) MIPS
Average Peak
ADSP-21364 62.1 87.9 30.5 22.0 24.4
ADSP-21469 / 21479 / 21489 45.3 87.9 30.5 22.0 24.4

  • MIPS measured using a 5.1 vector (SCE+2*CPE+LFE+CCE(D)) with bit rate 373kpbs, Fs=48 kHz, internal memory code and data layout, on a SHARC ADSP-214xx processor.
  • "Data RAM" for one instance, includes Stack, Scratch, Instance/State, Minimum Input and Output Single Buffers.
  • Input buffer size is 4.5KiB and output buffer size is 24KiB for decoding 6 audio channels.
  • Reduced code size for ADSP-21469 is due to the short-word instruction mode available for this processor family.

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Availability and Licensing

Each module supports the Analog Devices, Inc. (ADI) Blackfin or SHARC Processor family and is a licensed product that is available in object code format. Recipients must sign or accept a license agreement with ADI prior to being shipped or downloading the modules identified in the license agreement.

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