You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
123 lines
3.2 KiB
123 lines
3.2 KiB
/*
|
|
* Copyright 2010 Google Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.levien.synthesizer.core.model.modules;
|
|
|
|
import java.util.Arrays;
|
|
|
|
import com.levien.synthesizer.core.model.CachedSignalProvider;
|
|
import com.levien.synthesizer.core.model.SignalProvider;
|
|
import com.levien.synthesizer.core.model.SynthesisTime;
|
|
|
|
/**
|
|
* Delay is a module for recording sampled sound and playing it back later. It has 3 modes.
|
|
* In regular mode, it outputs its input, attenuated by half.
|
|
* In record mode, it also captures sound until it is stopped or the MAX_BUFFER_SIZE is reached.
|
|
* In play mode, it plays back its output mixed with the recorded buffer in a loop.
|
|
*/
|
|
public class Delay extends CachedSignalProvider {
|
|
public Delay(SignalProvider source, SignalProvider mix) {
|
|
source_ = source;
|
|
mix_ = mix;
|
|
buffer_ = new double[MAX_BUFFER_SIZE];
|
|
current_ = 0;
|
|
bufferSize_ = MAX_BUFFER_SIZE;
|
|
Arrays.fill(buffer_, 0.0);
|
|
playing_ = false;
|
|
recording_ = false;
|
|
}
|
|
|
|
@Override
|
|
protected synchronized double computeValue(SynthesisTime time) {
|
|
double input = source_.getValue(time);
|
|
double mix = mix_.getValue(time);
|
|
if (playing_) {
|
|
double output = mix * buffer_[current_] + (1.0 - mix) * input;
|
|
current_ = (current_ + 1) % bufferSize_;
|
|
return output;
|
|
} else {
|
|
if (recording_) {
|
|
buffer_[bufferSize_++] = input;
|
|
if (bufferSize_ >= MAX_BUFFER_SIZE) {
|
|
stopRecording();
|
|
}
|
|
}
|
|
return (1.0 - mix) * input;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Resets the buffer and changes to record mode.
|
|
*/
|
|
public synchronized void startRecording() {
|
|
playing_ = false;
|
|
recording_ = true;
|
|
current_ = 0;
|
|
bufferSize_ = 0;
|
|
}
|
|
|
|
/**
|
|
* Stops recording, but doesn't start playing.
|
|
*/
|
|
public synchronized void stopRecording() {
|
|
recording_ = false;
|
|
current_ = 0;
|
|
}
|
|
|
|
/**
|
|
* Starts playing what's recorded.
|
|
*/
|
|
public synchronized void startPlaying() {
|
|
playing_ = true;
|
|
recording_ = false;
|
|
current_ = 0;
|
|
}
|
|
|
|
/**
|
|
* Stops playing and recording.
|
|
*/
|
|
public synchronized void stopPlaying() {
|
|
playing_ = false;
|
|
recording_ = false;
|
|
current_ = 0;
|
|
}
|
|
|
|
/**
|
|
* Returns whether the module is in playing mode.
|
|
*/
|
|
public synchronized boolean isPlaying() {
|
|
return playing_;
|
|
}
|
|
|
|
/**
|
|
* Returns whether the module is in record mode.
|
|
*/
|
|
public synchronized boolean isRecording() {
|
|
return recording_;
|
|
}
|
|
|
|
private SignalProvider source_;
|
|
private SignalProvider mix_;
|
|
|
|
private double[] buffer_;
|
|
private int bufferSize_;
|
|
private int current_;
|
|
|
|
private boolean playing_;
|
|
private boolean recording_;
|
|
|
|
private final static int MAX_BUFFER_SIZE = 10;
|
|
}
|
|
|