amf_delayallpassoffchip_s.c

ADI SHARC DSP 音频算法标准模块库

// Copyright(c) 2005 Analog Devices, Inc. All Rights Reserved. ADI Confidential.

#include "AMF_DelayAllpassOffChip_S.h"

void AMF_DelayAllpassOffChip_S_Render(AMF_DelayAllpassOffChip_S * restrict instance,float * restrict * buffers,int tickSize);

#if 0

#pragma optimize_for_speed
SEG_MOD_FAST_CODE  void AMF_DelayAllpassOffChip_S_Render(AMF_DelayAllpassOffChip_S * restrict instance,float * restrict * buffers,int tickSize) {
    int delay = instance->delay;		// delay in samples
    float *delayBuffer = &instance->delayBuffer[0];		// delay buffer
    int writeIndex = instance->delayWritePtr-delayBuffer;			// delay index
    int i;
    float tmp;
    AMF_Signal *in = buffers[0]; 
    AMF_Signal *out = buffers[1]; 
    float pm *readBufPtr;
	float pm *writePtr;
    float coef = instance->coef;
    float *tmpbuf = buffers[2];
    int delayLength = delay*2;

    // bring the data from delayBuffer on chip
	// weird kludge to get the compiler to actually set the B0 register...
	readBufPtr = (float pm *)((int)delayBuffer);
	readBufPtr = (float pm *)__builtin_circptr(readBufPtr, writeIndex, (float pm *)((int)delayBuffer), delayLength);

#pragma loop_count(8,256,8)
#pragma no_alias		
    for (i=0; i<2*tickSize; i++) {
		tmpbuf[i] = *readBufPtr;
		readBufPtr = (float pm *)__builtin_circptr(readBufPtr, 1, (float pm *)((int)delayBuffer), delayLength);		 
    } 

#pragma loop_count(8,256,8)
    for (i=0; i<2*tickSize; i++) {
		tmp = tmpbuf[i] + coef*in[i];
        tmpbuf[i] = in[i] - coef*tmp; // make sure we read in[] before writing out[], to allow aliasing
        out[i] = tmp;
    }

    // write data to off chip memory
	// weird kludge to get the compiler to actually set the B0 register...
	writePtr = (float pm *)((int)delayBuffer);
	writePtr = (float pm *)__builtin_circptr(writePtr, writeIndex, (float pm *)((int)delayBuffer), delayLength);	

#pragma loop_count(8,256,8)
#pragma no_alias
	for (i=0; i<2*tickSize; i++) {
		*writePtr = tmpbuf[i];
		writePtr = (float pm *)__builtin_circptr(writePtr, 1, (float pm *)((int)delayBuffer), delayLength);
    }    

    instance->delayWritePtr = (float *)writePtr;
}
#endif 

SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassDelayAllpassOffChip_S = {
    
    /* Flags */
	0,

	/** Reference to render function. */
	(AMF_RenderFunction)AMF_DelayAllpassOffChip_S_Render,  // render function 

    /* Default bypass */
	(void *)0,

	/* Input descriptor - 1 input, and it is stereo. */
	1, AMF_StereoPin(0),

	/* Output descriptor - 1 output, and it is stereo. */
    1, AMF_StereoPin(0),
};