g711si3000loopback_main.c

Audio compression on embedded board

/*********************************************************************
*                                                                    *
*                       Software License Agreement                   *
*                                                                    *
*   The software supplied herewith by Microchip Technology           *
*   Incorporated (the "Company") for its dsPIC controller            *
*   is intended and supplied to you, the Company's customer,         *
*   for use solely and exclusively on Microchip dsPIC                *
*   products. The software is owned by the Company and/or its        *
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*   the terms and conditions of this license.                        *
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*   THIS SOFTWARE IS PROVIDED IN AN "AS IS" CONDITION.  NO           *
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*   BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND    *
*   FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE     *
*   COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,  *
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#include <p33Fxxxx.h>
#include "G711Lib_common.h"
#include "G711Lib_Si3000.h"

_FOSCSEL(FNOSC_PRIPLL);
_FOSC(FCKSM_CSDCMD & OSCIOFNC_OFF & POSCMD_EC);
_FWDT(FWDTEN_OFF);

/*-----------------------------------------------------------------------------
                                  Global Variables
------------------------------------------------------------------------------*/
// User defined ping pong
short buffer1[NUMOFSAMPLESPERBLOCK];        //sampleIpBuffer.
short buffer2[NUMOFSAMPLESPERBLOCK];    	//sampleOpBuffer.
short expandbuffer1[NUMOFSAMPLESPERBLOCK];	//sampleExpIpBuffer
short expandbuffer2[NUMOFSAMPLESPERBLOCK];	//sampleExpOpBuffer
short buffer11[NUMOFSAMPLESPERBLOCK];   	//sampleComprsIpBuffer.
short buffer12[NUMOFSAMPLESPERBLOCK];		//sampleComprsOpBuffer.
long slen = NUMOFSAMPLESPERBLOCK;
short  *temp, *temp1;

/*-----------------------------------------------------------------------------
                                  Macro instantiation
------------------------------------------------------------------------------*/
G711SI3000INIT                     //Macro to instantiate SI3000 structure
CODECSETUP                         //Macro to instantiate CODECSETUP structure

/******************************************************************************
**
**  FunctionName: G711SI3000LoopBack_Main ( )
**
**  Description:  Wrapper.
**
******************************************************************************/
int main ( void )
{
  /* PLLFBD: Oscillator PLL Divisor Control Register set for 12.288 Mhz*/
  CLKDIV = 0x00C0;
  PLLFBD = 62;                                //Fcy = Fosc/2;
     
  /* Initialize DCI and SI3000 Registers */
  libSi3000Init ();

  /* Start sampling speech data from SI3000 codec.Sampling of speech is stopped
     when number of samples played equals recordsize value specified in 
     CODECSETUP structure. */
  libSi3000StartSampling ( buffer1, buffer2,expandbuffer1,expandbuffer2,
                                    buffer11, buffer12 );
  libStartPlay ();                        //Enables the user to play speech.

  if ( codecdata.law == 1 )
  {
    /*-------------------------------------------------------------------------
                                 A LAW
    -------------------------------------------------------------------------*/
    while (1)
    {
      /*If one Block of RAW speech data has been loaded in one of the ping pong
        buffers then start compressing that buffer*/
      if ( 1 == codecdata.fBlockdone )
      {
        /* A Law Compress */
        alaw_compress(slen ,codecdata.sampleOpBuffer ,\
                                  codecdata.sampleComprsIpBuffer);

        libBufManagerEncoder ();
        codecdata.fCompressdone = 0x01;
      }

      if( codecdata.fCompressdone == 0x01 )
      {
        /* A Law Expand */
	    alaw_expand( slen,codecdata.sampleComprsOpBuffer,\
			        codecdata.sampleExpandIpBuffer );

        /* Rewind the sample buffer poniter */
        while ( codecdata.fBlockplayed != 0x00 );
        libBufManagerDecoder ();
	codecdata.fCompressdone  = 0x00;
      }
      
      /* Check if the total number of blocks specified by #define RECORDSIZE
       in G711Lib_common.h have been played */

      if (  codecdata.recordSize == codecdata.loadblockCount )
         codecdata.loadblockCount=0;
        
    }
  }
  else
  {
    /*-------------------------------------------------------------------------
                                 U LAW
    --------------------------------------------------------------------------*/
    while (1)
    {
      /*If one Block of RAW speech data has been loaded in one of the ping pong
       buffers then start compressing that buffer*/
      if ( 1 == codecdata.fBlockdone )
      {
        /* A Law Compress */
        ulaw_compress( slen ,codecdata.sampleOpBuffer , \
			          codecdata.sampleComprsIpBuffer );

        libBufManagerEncoder ();
        codecdata.fCompressdone = 0x01;
      }

      if( codecdata.fCompressdone == 0x01 )
      {
        /* U Law Expand */
        ulaw_expand( slen,codecdata.sampleComprsOpBuffer,
			        codecdata.sampleExpandIpBuffer );

        /* Rewind the sample buffer poniter */
        while ( codecdata.fBlockplayed != 0x00 );
        libBufManagerDecoder ();
	codecdata.fCompressdone  = 0x00;
      }

      /* Check if the total number of blocks specified by #define RECORDSIZE
       in G711Lib_common.h have been played */
      if (  codecdata.recordSize == codecdata.loadblockCount )
      codecdata.loadblockCount=0; 
            
    }
  }
  while( 1 );
}

/*-----------------------------------------------------------------------------
               END OF FILE: RealTimeG711SI3000LoopBack_Main.c 
-----------------------------------------------------------------------------*/