MPEG-4 AAC-BSAC Decoder

Bit Slice Arithmetic Coding (BSAC) slices the quantized spectrum into layers and each layer is arithmetic coded. BSAC can be used in audio coding for bit-rate scalability during the encoding or ...More

MPEG-4 AAC-BSAC Decoder

Product Description

Bit Slice Arithmetic Coding (BSAC) slices the quantized spectrum into layers and each layer is arithmetic coded. BSAC can be used in audio coding for bit-rate scalability during the encoding or decoding process.

The concept of BSAC was standardized for MPEG-4 AAC by ISO/IEC 14496-3 subpart 4. The difference between MPEG-4 BSAC and the standard AAC is that the quantized values are arithmetically coded. A group of slices is called a layer and the layers can be decoded independently. Few layers are sufficient to be decoded to produce reasonably good quality audio. This gives QoS scalability and is very important in error-prone media like wireless. MPEG-4 BSAC is adopted by the Multimedia standard T-DMB.

Features

  • Fast Forward / Rewind: API supports seek forward or backward to desired position in a CBR streams.
  • Extended Test Vector Testing: Compliant with ISO test vectors and customer supplied vectors.
  • Optional tools support: IS, MS,TNS PNS supported
  • eMedia Support: Runs live on eMedia platform with H264 Baseline Profile video using vectors captured in Korean public T-DMB transmissions. Tested extensively in live environment.
  • Live Play Support: Available on ADSP BF533 EZ-KIT-lite under VDSP ++4.5
  • API: Supports 'Pull' style API

Functions

  • Code base origin: ISO Reference code for MPEG4 AAC-BSAC Decoder and ADI's MPEG4 AAC Decoder on Blackfin.
  • Release Status: Production
  • Framework dependencies: Requires MPEG4-SL layer for proper scalability
  • Release format: Object code module with C source wrapper
  • Input format: Supports MPEG4 AAC-BSAC Streams compliant with the ISO/IEC 14496-3:2005(E) standard and ISO/IEC 14496-4:2004
  • Output format: Supports mono and two channels (Stereo) 16-bit PCM Non Interleaved (left, left,....... left, right, right ...right) format
  • Sample Rate: All sample frequency specified by the standard ISO/IEC 14496-3
  • Bit Rate: All bit rates specified by standard (only CBR)
  • Performance (typical): 14.8 MHz for 64 kbit/s bit rate @ 48 kHz sampling rate
  • Video formats supported: NTSC and PAL (720x576 25fps)

Performance Metrics

MIPS summary:

Memory With Instruction and Data Cache enabled

Instruction Memory (KB) Data Memory (KB)
On-chip Off-chip On-chip Off-chip
30.6 4.4 58 8.629

MIPS Requirement: MIPS required for the above configuration for a 48Khz vector for various bitrates

Bit Rate (kbps) Average MIPS Peak MIPS
64 14.8 19.2
48 12.8 15.9
  • The MIPS performance was measured using worst case SQAM test vectors & expressed as Average and Peak figures.
  • Integrators will need to budget their MIPS based on their system requirements.

Applications

  • Mobile TV
  • Multi-media Co-processor
  • Industrial Control
  • Instrumentation

Requirements

Availability and Licensing

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

Contact your ADI Sales Rep to request this code. If you need to find a Sales Rep in your area, please visit the Sales & Distributor Map/Listing.