amf_delay_s.c

ADI SHARC DSP 音频算法标准模块库

// Copyright(c) 2005 Analog Devices, Inc. All Rights Reserved.
// This software is proprietary and confidential to Analog Devices, Inc. and its licensors.

// File    : $Id: //depot/development/visualaudio/modules/2.5.0/SHARC/Source/AMF_Delay_S.c#3 $ 
// Part of : VisualAudio V2.5.0 
// Updated : $Date: 2006/10/12 $ by $Author: Fernando $



#include "AMF_Delay_S.h"


void AMF_Delay_S_Render(AMF_Delay_S * restrict instance,float * restrict * buffers,int tickSize);


// NOTE: The C version of this function is for reference only (it is
//       intended just to show the general algorithm that the module
//       uses), and it may not have been fully tested
#if 0

SEG_MOD_FAST_CODE  void AMF_Delay_S_Render(AMF_Delay_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;
    float *in = buffers[0]; // Don't use restrict because we say they can alias (see .h file)
    float *out = buffers[1];
    float *bufPtr;
    int bufferLen = 2*delay;
        
    // weird kludge to get the compiler to actually set the B0 register...
    bufPtr = delayBuffer;
    bufPtr = __builtin_circptr(bufPtr, writeIndex, delayBuffer, bufferLen);        

    // the asm does this loop in SIMD
    for (i=0; i<2*tickSize; i++) {
        tmp = *bufPtr;
        *bufPtr = in[i];
        bufPtr = __builtin_circptr(bufPtr, 1, delayBuffer, bufferLen);        
         out[i] = tmp;
    }    
       instance->delayWritePtr = bufPtr;
}

#endif



SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassDelay_S = {

    /* Flags */
    0,

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

    /* 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)
    
};