server/scsynth/SC_Rate.cpp

   1 /*
   2         SuperCollider real time audio synthesis system
   3     Copyright (c) 2002 James McCartney. All rights reserved.
   4         http://www.audiosynth.com
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  19 */
  20
  21
  22 #include "SC_Rate.h"
  23 #include "SC_Constants.h"
  24 #include "SC_Prototypes.h"
  25
  26 void Rate_Init(Rate *inRate, double inSampleRate, int inBufLength)
  27 {
  28         inRate->mSampleRate = inSampleRate;
  29         inRate->mSampleDur = 1. / inRate->mSampleRate;
  30         inRate->mRadiansPerSample = twopi / inRate->mSampleRate;
  31
  32         inRate->mBufLength = inBufLength;
  33         inRate->mBufDuration = inRate->mBufLength / inRate->mSampleRate;
  34         inRate->mBufRate = 1. / inRate->mBufDuration;
  35         inRate->mSlopeFactor = 1. / inRate->mBufLength;
  36         inRate->mFilterLoops = inRate->mBufLength / 3;
  37         inRate->mFilterRemain = inRate->mBufLength % 3;
  38     if( inRate->mFilterLoops == 0. )
  39         inRate->mFilterSlope = 0.;
  40     else
  41             inRate->mFilterSlope = 1. / inRate->mFilterLoops;
  42 }