amf_readbackbuffer.c

ADI SHARC DSP 音频算法标准模块库

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

// File    : $Id: //depot/development/visualaudio/modules/2.5.0/SHARC/Source/AMF_ReadbackBuffer.c#5 $ 
// Part of : VisualAudio V2.5.0 
// Updated : $Date: 2006/10/12 $ by $Author: Fernando $

#include "AMF_ReadbackBuffer.h"

void AMF_ReadbackBuffer_Render(AMF_ReadbackBuffer * restrict instance,float * restrict * buffers,int tickSize);

SEG_MOD_FAST_CODE  void AMF_ReadbackBuffer_Render(AMF_ReadbackBuffer * restrict instance,float * restrict * buffers,int tickSize) {
    int i;

    float *in = buffers[0];
    int bufferLen = instance->bufferLen;
    int activeBuffer = instance->buffer[bufferLen*2];

    float *buf = instance->buffer+(bufferLen*activeBuffer);
    int writeIndex = instance->bufferWriteIndex;
    int target = writeIndex+tickSize;

    if (target > bufferLen) 
    { 
        target = bufferLen;
    }
    
    for (i=0; writeIndex < target;)
    {
        buf[writeIndex++] = in[i++];
    }
    if (writeIndex >= bufferLen)
    {
        writeIndex = 0;
        instance->buffer[bufferLen*2] = activeBuffer ^ 1;
    }

    
    instance->bufferWriteIndex = writeIndex;
}

SEG_MOD_SLOW_CONST const AMF_ModuleClass AMFClassReadbackBuffer = {
    
    /* Flags */
    0,
     
    /* Render function */
    (AMF_RenderFunction)AMF_ReadbackBuffer_Render,  // render function 
    
    /* Default bypass */
    (void *)0,
    
    /* Input descriptor - one input. */
    1, 0,

    /* Output descriptor - 1 output, and it is mono. */
    0
};