115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
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// _____________
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// _________________
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// _____/~\___________/\_
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// ______/\_/\_________/\____
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// ______/\___/\_______/\______
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// _____/\_____/\_____/\_______
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// ____/\_______/\___/\________
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// __/\_________/\_/\________
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// /\___________/~\_______
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// ___________________
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// _____________
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//
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//***************************************************************************//
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//* *//
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//* Project : Neural Audio *//
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//* File : PeakConverter.c *//
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//* Description : Peak converter with rise time / fall time *//
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//* Author(s) : Jeff Thompson *//
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//* *//
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//* Copyright (c) Neural Audio Corp. 2008 *//
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//* *//
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//***************************************************************************//
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#include "Neural_THX_Encoders.h"
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#include <math.h>
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//***************************************************************************//
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//* PeakConverter_INIT *//
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//***************************************************************************//
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int PeakConverter_INIT(float RiseTime, //in msec
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float FallTime, //in msec
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float MinValue,
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float MaxValue,
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unsigned int SampleRate,
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PeakConverter_Struct * pParams)
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{
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if(SampleRate == 0)
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return UNSUPPORTED_SAMPLERATE;
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if(MaxValue-MinValue <= 0.0f)
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return UNSUPPORTED_PARAMETER;
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if(RiseTime > 0)
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pParams->RiseSlew = (MaxValue-MinValue) / (RiseTime * 0.001f * (float)SampleRate);
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else
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pParams->RiseSlew = (MaxValue-MinValue);
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pParams->RiseTime = RiseTime;
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if(FallTime > 0)
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pParams->FallSlew = -(MaxValue-MinValue) / (FallTime * 0.001f * (float)SampleRate);
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else
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pParams->FallSlew = -(MaxValue-MinValue);
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pParams->FallTime = FallTime;
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pParams->MinValue = MinValue;
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pParams->MaxValue = MaxValue;
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pParams->PrevValue = 0.0f;
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pParams->SampleRate = SampleRate;
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return NRLSUR_OK;
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}
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//***************************************************************************//
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//* PeakConverter(...) *//
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//***************************************************************************//
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int PeakConverter(float * PtrIn,
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float * PtrOut,
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float RiseTime, //in msec
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float FallTime, //in msec
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float MinValue,
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float MaxValue,
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unsigned int Framesize,
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unsigned int SampleRate,
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PeakConverter_Struct * pParams)
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{
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int n;
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int RetVal;
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float fTemp;
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if(SampleRate == 0)
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return UNSUPPORTED_SAMPLERATE;
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if(RiseTime < 0.0f)
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RiseTime = 0.0f;
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if(RiseTime > 5000.0f)
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RiseTime = 5000.0f;
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if(FallTime < 0.0f)
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FallTime = 0.0f;
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if(FallTime > 5000.0f)
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FallTime = 5000.0f;
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//If parameters have changed, then re-initialize
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if( RiseTime != pParams->RiseTime ||
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FallTime != pParams->FallTime ||
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MinValue != pParams->MinValue ||
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MaxValue != pParams->MaxValue ||
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SampleRate != pParams->SampleRate ) {
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RetVal = PeakConverter_INIT(RiseTime,FallTime,MinValue,MaxValue,SampleRate,pParams);
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if(RetVal != NRLSUR_OK)
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return RetVal;
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}
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//-----------------------------------------------------------//
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// Perform peak converter processing //
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//-----------------------------------------------------------//
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for(n = 0; n < (int)Framesize; n++){
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fTemp = PtrIn[n] - pParams->PrevValue;
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if(fTemp > pParams->RiseSlew)
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fTemp = pParams->RiseSlew;
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if(fTemp < pParams->FallSlew)
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fTemp = pParams->FallSlew;
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PtrOut[n] = pParams->PrevValue + fTemp;
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pParams->PrevValue = PtrOut[n];
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}
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return NRLSUR_OK;
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}
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