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| 1 | +/* RTcmix - Copyright (C) 2004 The RTcmix Development Team | |
| 2 | + See ``AUTHORS'' for a list of contributors. See ``LICENSE'' for | |
| 3 | + the license to this software and for a DISCLAIMER OF ALL WARRANTIES. | |
| 4 | +*/ | |
| 5 | + | |
| 6 | +#include "Odelay.h" | |
| 7 | +#include <stdlib.h> | |
| 8 | +#include <string.h> | |
| 9 | +#include <assert.h> | |
| 10 | +#include <stdio.h> | |
| 11 | + | |
| 12 | +Odelay::Odelay(long defaultLength) : _dline(NULL), _len(0) | |
| 13 | +{ | |
| 14 | + if (defaultLength > 0) { | |
| 15 | + _outpoint = 0; | |
| 16 | + resize(defaultLength); | |
| 17 | + clear(); | |
| 18 | + _inpoint = _len - 1; | |
| 19 | + } | |
| 20 | + else { | |
| 21 | + printf("****program error: Odelay defaultLength not > 0\n"); | |
| 22 | + assert(defaultLength > 0); // doesn't print anything in Max/MSP or console | |
| 23 | + } | |
| 24 | +} | |
| 25 | + | |
| 26 | +Odelay::~Odelay() | |
| 27 | +{ | |
| 28 | + free(_dline); | |
| 29 | +} | |
| 30 | + | |
| 31 | +void Odelay::clear() | |
| 32 | +{ | |
| 33 | + for (long i = 0; i < _len; i++) | |
| 34 | + _dline[i] = 0.0; | |
| 35 | + _lastout = 0.0; | |
| 36 | +} | |
| 37 | + | |
| 38 | +void Odelay::fill(double val) | |
| 39 | +{ | |
| 40 | + for (long i = 0; i < _len; i++) | |
| 41 | + _dline[i] = val; | |
| 42 | + _lastout = val; | |
| 43 | +} | |
| 44 | + | |
| 45 | +void Odelay::putsamp(float samp) | |
| 46 | +{ | |
| 47 | + _dline[_inpoint++] = samp; | |
| 48 | + if (_inpoint == _len) | |
| 49 | + _inpoint = 0; | |
| 50 | +} | |
| 51 | + | |
| 52 | +float Odelay::getsamp(double lagsamps) | |
| 53 | +{ | |
| 54 | + _outpoint = _inpoint - (long) lagsamps; | |
| 55 | +#ifdef AUTOEXPAND | |
| 56 | + if (lagsamps >= (double) _len) | |
| 57 | + resize((long)(lagsamps + 0.5)); | |
| 58 | +#endif | |
| 59 | + if (_len > 0) { | |
| 60 | + while (_outpoint < 0) | |
| 61 | + _outpoint += _len; | |
| 62 | + } | |
| 63 | + return _lastout = _dline[_outpoint++]; | |
| 64 | +} | |
| 65 | + | |
| 66 | +// Set output pointer <_outpoint>. | |
| 67 | + | |
| 68 | +void Odelay::setdelay(double lagsamps) | |
| 69 | +{ | |
| 70 | + _outpoint = _inpoint - (long) lagsamps; | |
| 71 | +#ifdef AUTOEXPAND | |
| 72 | + if (lagsamps >= (double) _len) | |
| 73 | + resize((long)(lagsamps + 0.5)); | |
| 74 | +#endif | |
| 75 | + if (_len > 0) { | |
| 76 | + while (_outpoint < 0) | |
| 77 | + _outpoint += _len; | |
| 78 | + } | |
| 79 | +} | |
| 80 | + | |
| 81 | +float Odelay::next(float input) | |
| 82 | +{ | |
| 83 | + _dline[_inpoint++] = input; | |
| 84 | + if (_inpoint == _len) | |
| 85 | + _inpoint = 0; | |
| 86 | + _lastout = _dline[_outpoint++]; | |
| 87 | + if (_outpoint == _len) | |
| 88 | + _outpoint = 0; | |
| 89 | + return _lastout; | |
| 90 | +} | |
| 91 | + | |
| 92 | +static float *newFloats(float *oldptr, long oldlen, long *newlen) | |
| 93 | +{ | |
| 94 | + float *ptr = NULL; | |
| 95 | + if (oldptr == NULL) { | |
| 96 | + ptr = (float *) malloc(*newlen * sizeof(float)); | |
| 97 | + } | |
| 98 | + else { | |
| 99 | + float *newptr = (float *) realloc(oldptr, *newlen * sizeof(float)); | |
| 100 | + if (newptr) { | |
| 101 | + ptr = newptr; | |
| 102 | + // Zero out new portion. | |
| 103 | + for (long n = oldlen; n < *newlen; ++n) | |
| 104 | + ptr[n] = 0.0f; | |
| 105 | + } | |
| 106 | + else { | |
| 107 | + *newlen = oldlen; // notify caller that realloc failed | |
| 108 | + ptr = oldptr; | |
| 109 | + } | |
| 110 | + } | |
| 111 | + return ptr; | |
| 112 | +} | |
| 113 | + | |
| 114 | +int Odelay::resize(long thisLength) | |
| 115 | +{ | |
| 116 | + const long oldlen = _len; | |
| 117 | + | |
| 118 | + if (thisLength == oldlen) | |
| 119 | + return oldlen; | |
| 120 | + | |
| 121 | +// For Max/MSP we rely on object to manage maxdeltime and don't take advantage | |
| 122 | +// of Doug's code to automatically resize delay lines. | |
| 123 | +#ifdef AUTOEXPAND | |
| 124 | + // Make a guess at how big the new array should be. | |
| 125 | + long newlen = (thisLength < _len * 2) ? _len * 2 : _len + thisLength; | |
| 126 | +#else | |
| 127 | + long newlen = thisLength; | |
| 128 | +#endif | |
| 129 | + _dline = ::newFloats(_dline, _len, &newlen); | |
| 130 | + if (_outpoint < 0 && newlen > 0) { | |
| 131 | + while (_outpoint < 0) | |
| 132 | + _outpoint += oldlen; | |
| 133 | + long shift = newlen - oldlen; | |
| 134 | + memcpy(&_dline[_outpoint + shift], | |
| 135 | + &_dline[_outpoint], | |
| 136 | + sizeof(float) * (oldlen - _outpoint)); | |
| 137 | + _outpoint += shift; | |
| 138 | + } | |
| 139 | + return _len = newlen; | |
| 140 | +} | |
| 141 | + | |
| 142 | +float Odelay::delay() const | |
| 143 | +{ | |
| 144 | + return (float) (_len > 0) ? abs((_outpoint - _inpoint) % _len) : 0; | |
| 145 | +} | |