amf_delayallpassoffchip_4coef_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_4Coef_S.h"

void AMF_DelayAllpassOffChip_4Coef_S_Render(AMF_DelayAllpassOffChip_4Coef_S * restrict instance,float * restrict * buffers,int tickSize);

#if 0
#pragma optimize_for_speed
SEG_MOD_FAST_CODE  void AMF_DelayAllpassOffChip_4Coef_S_Render(AMF_DelayAllpassOffChip_4Coef_S * restrict instance,float * restrict * buffers,int tickSize) {
    int delay = instance->delay;		// delay in samples
    int delaySize =instance->delaySize;
    float *delayBuffer = &instance->delayBuffer[0];		// delay buffer
    int writeIndex = instance->delayWritePtr-delayBuffer;			// delay index
    int i;
    float tmp;
    float *in = buffers[0]; 
    float *out = buffers[0]; 
	float pm *bufPtr;
    float *tmpbuf = buffers[2];
    float pm *readBufPtr;
    float al0, al1, al2, al3;

	// weird kludge to get the compiler to actually set the B0 register...
	readBufPtr = (float pm *)((int)delayBuffer);
	readBufPtr = (float pm *)__builtin_circptr(readBufPtr, writeIndex-delay*2, (float pm *)((int)delayBuffer), delaySize*2);
#pragma loop_count(8,256,8)
#pragma no_alias		
    for (i=0; i<2*tickSize; i++) {
		out[i] = *readBufPtr;
		readBufPtr = (float pm *)__builtin_circptr(readBufPtr, 1, (float pm *)((int)delayBuffer), delaySize*2);		
    } 

    // do the sum at the front of the delay
    al2 = instance->AL2;
    al3 = instance->AL3;
#pragma loop_count(8,256,8)
#pragma no_alias		
#pragma SIMD_for
    for (i=0; i<2*tickSize; i++) {
        tmpbuf[i] = al2*in[i] + al3*out[i];
    }

	// weird kludge to get the compiler to actually set the B0 register...
	bufPtr = (float pm *)((int)delayBuffer);
	bufPtr = (float pm *)__builtin_circptr(bufPtr, writeIndex, (float pm *)((int)delayBuffer), delaySize*2);	

#pragma loop_count(8,256,8)
#pragma no_alias
	for (i=0; i<2*tickSize; i++) {
		bufPtr[0] = tmpbuf[i];
		bufPtr = (float pm *)__builtin_circptr(bufPtr, 1, (float pm *)((int)delayBuffer), delaySize*2);
    }    
    instance->delayWritePtr = (float *)bufPtr;

    // if we DMA'ed the above transfer, we could overlap this computation with it
   
    // do the sum at the output
    al0 = instance->AL0;
    al1 = instance->AL1;
#pragma loop_count(8,256,8)
#pragma no_alias		
#pragma SIMD_for
    for (i=0; i<2*tickSize; i++) {
        out[i] = al0*in[i] + al1*out[i];
    }
}
#endif 

SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassDelayAllpassOffChip_4Coef_S = {
    
    /* Flags */
	0,

	/** Reference to render function. */
	(AMF_RenderFunction)AMF_DelayAllpassOffChip_4Coef_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),
};