Sampling Rate: The MPEG4 AAC Encoder supports sampling frequency from 8kHz to 96 kHz as specified by the standard.

Bit Rate: The MPEG4 AAC Encoder supports all bit rates specified by the standard.

DESCRIPTION

The Adaptive Digital Technologies MPEG4-AAC (LC/LTP) Decoder decodes MPEG4 AAC bit streams. The AAC decoder supports MPEG4 audio decoding for ADIF (audio data interchange format) and ADTS (audio data transport stream) encoded data.

FEATURES

• MPEG4 AAC Low complexity (LC) Object type of the standard for up to 2 channels (stereo).
• MPEG4 AAC Long Term Prediction (LTP) Object type of the standard for up to 2 channels (stereo).
• Supports both ADIF (Audio Data Interchange Format) and ADTS (Audio Data Transport Stream) encoded data.
• Compliant with XDAIS specification.
• Data memory can be allocated at run-time.

AVAILABILITY

ADT MPEG4 AAC Decoder is available on the TMS320C5000™ DSP Platform

C55x™DSP Generation

SPECIFICATIONS

MIPS (Peak) CPU Resource and Memory Resource Requirements

• C55x
  

CYCLES INFORMATION –Profiled on TMS320C5510

Configuration	Test File Parameters	MIPS(MAX)	MIPS(AVG)
MPEG4_AAC_LC_Low Mem	64kbps_44.1khz	9.41	8.65
MPEG4_AAC_LC_Low MIPS	64kbps_44.1khz	7.01	6.33
MPEG4_AAC_LTP_Low Mem	64kbps_44.1khz	9.41	8.57
MPEG4_AAC_LTP_Low MIPS	64kbps_44.1khz	7.02	6.22

 

MEMORY STATISTICS

All Memory usage is given in units of kilobytes.

Configuration	Program Memeory	Constants	Scratch	Instance
MPEG4_AAC_LC_Low Mem	15.27	10.22	8.00	7.48
MPEG4_AAC_LC_Low MIPS	14.61	25.42	8.00	7.48
MPEG4_AAC_LTP_Low Mem	21.46	11.35	12.00	17.48
MPEG4_AAC_LTP_Low MIPS	21.19	25.44	12.00	17.48

API FUNCTIONS

DECODE_create (…) creates an instance of the DECODE algorithm and returns a handle to the object

DECODE_decode (…) processes the decoder

DECODE_delete (…) deletes the instance of the dynamically created object referenced to by the handle