libarrayfilldecoderinputpm.c

Audio compression on embedded board

/*********************************************************************
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*   The software supplied herewith by Microchip Technology           *
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/******************************************************************************
**
**  Filename:     libarrayFillDecoderInputPM.c
**
**  System:       RISC
**
**  Platform:     dsPIC33F
**
**  Description:  This file contains only libarrayFillG711ExpanderInputPM() API.
**                This API fills the user defined ping pong buffers with speech
**                samples from array in .c file created using PCRU.
**
******************************************************************************/

#include <p33Fxxxx.h>
#include "G711Lib_common.h"

/******************************************************************************
**
**  FunctionName: libarrayFillDecoderInputPM ( )
**
**  Description:  This API is called in the Main for moving data from array
**                in .s file created using PCRU the to the user defined ping
**                pong buffers.It accesses members of the codecsetup structure.
**                It has no outputs.
******************************************************************************/
void libarrayFillDecoderInputPM (void)
{
  short u, *temp;

  for (u = 0; ( u < codecdata.numOfSamplesPerBlock ) &&
              (codecdata.sampleCount < codecdata.arraysizeinbytes); u++) 
  {
    /* Read the samples to input buffer and Remove the Sign Extension*/
    *codecdata.sampleComprsIpBuffer++ = (( short )libTblByteRead ( ) & 0x00FF);

    /* Increament the number of samples Expanded */
    codecdata.sampleCount++;
  }

  /* ping-pong house keeping */
  if(codecdata.sampleCount >= codecdata.arraysizeinbytes) 
  {
    /* Input buffer pointing back to the last value */
    codecdata.sampleComprsIpBuffer--;
  }
  else
  {
    codecdata.sampleComprsIpBuffer -= (codecdata.numOfSamplesPerBlock );
    temp = codecdata.sampleComprsIpBuffer;
    codecdata.sampleComprsIpBuffer = codecdata.sampleComprsOpBuffer;
    codecdata.sampleComprsOpBuffer = temp;

    /* Set this flag to indicate that one buffer has been filed to its capacity
       and is ready for use */
    codecdata.fBlockdone = 0x01;
  }
}

/*-----------------------------------------------------------------------------
                  END OF FILE : libarrayFillDecoderInputPM.c
-----------------------------------------------------------------------------*/