MusicKit  0.0.0
delayai.h
00001 /* Copyright 1993-1996 by J.O. Smith (jos@ccrma.stanford.edu).  All rights reserved. */
00002 
00003 #define GOLDEN_MEAN 1.61
00004 
00005 typedef struct _delayaiVars {
00006     pp output;      
00007     pp input;
00008     pp delayInput;  /* Must be in the range [0-1.0).  It is
00009                     * scaled by the delay length and subtracted
00010                     * from the write pointer. */
00011     MKWavetable delayMemory;
00012     int length;    /* Length of delay line (may be < delayMemory size) */
00013     int xnM1;      /* length-1 (an optimization) */
00014     int ynM1;      /* length-1 (an optimization) */
00015     int writeIndex;/* Delay memory write index */
00016     int readIndex; /* Delay memory read index */
00017     word apCoef;   /* allPass coefficient, calculated from fractional delay */
00018     double prev_delay; /* optimization */  
00019 } delayaiVars;
00020 
00021 
00022 extern void init_delayai(delayaiVars *a);
00023 extern void delayai(delayaiVars *a);
00024 
00025