echo.c

Using DSP/BIOS I/O in Multichannel Systems

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#include <std.h>
#include <log.h>
#include <pip.h>
#include <swi.h>
#include <trc.h>
#include "dss.h"

#define		BYTES_PER_WORD		4 
#define  	NUM_CHANNELS		2
#define		CHANNEL0			0
#define		CHANNEL1			1

extern far LOG_Obj 	trace; 	   	/* application printf() log */ 
extern far PIP_Obj	rxPip0;
extern far PIP_Obj	rxPip1;
extern far PIP_Obj	txPip0;
extern far PIP_Obj	txPip1;

extern Void doLoad(int load);

typedef struct dataChannel {
	PIP_Obj		*rxPip;
	PIP_Obj		*txPip;
	Int			procLoad;
} dataChannel;

dataChannel		audioChannel[NUM_CHANNELS];

/* The following external objects are defined in the config file audio.cdb */

Bool getInputBuf(PIP_Obj *aPip, Ptr *bufAddr, Uns **bufSize)
{
    if (aPip->readerNumFrames == 0) {
		LOG_error("getInputBuf: no frames on inPip 0x%x", (Arg)aPip);
		return(FALSE);
    } 
    else {
    	LOG_message("getInputBuf calling PIP_get for PIP 0x%x", (Arg)aPip);
		PIP_get(aPip);
    }
    *bufAddr = aPip->readerAddr;
    *bufSize = &aPip->readerSize;
    return(TRUE);
}

Bool getOutputBuf(PIP_Obj *aPip, Ptr *bufAddr, Uns **bufSize)
{
    if (aPip->writerNumFrames == 0) {
		LOG_error("getOutputBuf: no frames on outPip 0x%x", (Arg)aPip);
		return(FALSE);
    } 
    else {
    	LOG_message("getOutputBuf calling PIP_alloc for PIP 0x%x", (Arg)aPip);
		PIP_alloc(aPip);
    }
    *bufAddr = aPip->writerAddr;
    *bufSize = &aPip->writerSize;
    return(TRUE);
}

void completeProcessing(PIP_Obj *inPip, PIP_Obj *outPip)
{
	/* return the input buffer to the pipe from which it came; put the */
	/* output buffer into the output pipe; these actions will cause the */
	/* appropriate callbacks to execute, which will cause the next stage */
	/* of processing to take over */
    LOG_message("completeProcessing calling PIP_free for PIP 0x%x", (Arg)inPip);
    PIP_free(inPip);
    LOG_message("completeProcessing calling PIP_put for PIP 0x%x", (Arg)outPip);
    PIP_put(outPip);
}

void
processChannelBuf(int channelNum)
{ 
	Ptr			inBufAddr;
	Uns			*inBufSize;
	Ptr			outBufAddr;
	Uns			*outBufSize;
    
    /* the input processing takes input buffers from the rxPip, and outputs */
    /* buffers to the xferPip; need to get pointers to and sizes of the input */
    /* buffer and the output buffer */
	if (!getInputBuf(audioChannel[channelNum].rxPip, 
					 &inBufAddr, 
					 &inBufSize)) {
		return;
	}

	if (!getOutputBuf(audioChannel[channelNum].txPip, 
					  &outBufAddr, 
					  &outBufSize)) {
		return;
	}
	
	/* processing of input buffer data goes here; for this example, the */
	/* buffer is simply being copied from input to output; here the load */
	/* is simulated by calling a load function */
	doLoad(audioChannel[channelNum].procLoad);
	memcpy(outBufAddr, (const void *)inBufAddr, *inBufSize*BYTES_PER_WORD);
	*outBufSize = *inBufSize;
	
	/* transfer the output buffer to the next stage of processing */
	completeProcessing(audioChannel[channelNum].rxPip, 
				 	   audioChannel[channelNum].txPip);	
}

Void initializeChannelData(void)
{
	dataChannel		*pChannel;
	
	/* initialize the channel 0 values */
	pChannel = &audioChannel[CHANNEL0];
	pChannel->rxPip = &rxPip0;
	pChannel->txPip = &txPip0;
	pChannel->procLoad = 0;
	
	/* initialize the channel 0 values */
	pChannel = &audioChannel[CHANNEL1];
	pChannel->rxPip = &rxPip1;
	pChannel->txPip = &txPip1;
	pChannel->procLoad = 0;	
}

Void main()
{  
	initializeChannelData();
   	DSS_init();
}