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MP2 Audio Encoder is a high-quality MPEG-1 Audio Layer II PCM encoder written based on ISO/IEC standard aiming embedded applications. This library was originally developed to encode audio in real-time on Ti c6000 platform. MP2 remains a dominant standard for DVD, Digital Audio Broadcasting (DAB) and Digital Video Broadcasting (DVB) used in digital television standards.

Performance Parameters

RAM requirements: xxkB minimum, typicall xxkB

Typical code space requirements: xxkB

Typical speed: Stereo 48KHz,128Kb/s at xx% processor load (DM648 @900MHz)

Embedded MP2 audio encoder Application Programming Interface

1. void subband_initialise ( )

This function needs to be called once before using the MP2 Audio Encoder.

2. void encode_audio (short *smp_tot_I, short *smp_next_I) 

This function encodes PCM data in to a MPEG-1 Layer II stream. Parameters of this function controls the pointers of the main PCM array. The caller does not required to adjust these pointers which will be done within the encoding process of this function.

Parameters:      smp_tot_I        -           Total PCM samples in PCM buffer

smp_next_I     -           Next free memory location of the PCM buffer 

Note:

Global PCM buffer window is defined as follows. User requires to copy PCM samples to given location by smp_next_I variable.

unsigned short pcm_data[5376];