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75 lines
1.8 KiB
75 lines
1.8 KiB
/*
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* Copyright 2010 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.levien.synthesizer.core.model;
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/**
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* A simple counter to keep track of the logical time in synthesis.
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*/
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public class SynthesisTime {
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/**
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* Creates a new timer with a 0 time delta.
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*/
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public SynthesisTime() {
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deltaTime_ = 0.0;
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absoluteTime_ = 0.0;
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}
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/**
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* Returns how much time will elapse next time advance() is called.
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* @return the time delta in seconds.
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*/
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public double getDeltaTime() {
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return deltaTime_;
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}
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/**
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* Returns the absolute time that has elapsed since creation or last reset().
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* @return the time in seconds.
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*/
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public double getAbsoluteTime() {
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return absoluteTime_;
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}
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/**
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* Sets the "sample rate" of the synthesizer, which is the inverse of the time delta.
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* @param sampleRate - samples per second (in Hz).
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*/
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public void setSampleRate(double sampleRate) {
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if (sampleRate == 0.0) {
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deltaTime_ = 0.0;
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} else {
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deltaTime_ = 1.0 / sampleRate;
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}
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}
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/**
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* Resets the absolute time to zero.
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*/
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public void reset() {
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absoluteTime_ = 0.0;
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}
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/**
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* Advances the absolute time by the time delta.
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*/
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public void advance() {
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absoluteTime_ += deltaTime_;
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}
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private double deltaTime_;
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private double absoluteTime_;
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}
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