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/*
* Copyright 2001 Phil Burk, Mobileer 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.jsyn.util.soundfile;
import java.io.IOException;
import java.util.HashMap;
import com.jsyn.data.FloatSample;
import com.jsyn.data.SampleMarker;
/**
* Base class for various types of audio specific file parsers.
*
* @author (C) 2001 Phil Burk, SoftSynth.com
*/
abstract class AudioFileParser implements ChunkHandler {
IFFParser parser;
protected byte[] byteData;
boolean ifLoadData = true; /* If true, load sound data into memory. */
long dataPosition; /*
* Number of bytes from beginning of file where sound data resides.
*/
protected int bitsPerSample;
protected int bytesPerFrame; // in the file
protected int bytesPerSample; // in the file
protected HashMap<Integer, SampleMarker> cueMap = new HashMap<Integer, SampleMarker>();
protected short samplesPerFrame;
protected double frameRate;
protected int numFrames;
protected double originalPitch = 60.0;
protected int sustainBegin = -1;
protected int sustainEnd = -1;
public AudioFileParser() {
}
/**
* @return Number of bytes from beginning of stream where sound data resides.
*/
public long getDataPosition() {
return dataPosition;
}
/**
* This can be read by another thread when load()ing a sample to determine how many bytes have
* been read so far.
*/
public synchronized long getNumBytesRead() {
IFFParser p = parser; // prevent race
if (p != null)
return p.getOffset();
else
return 0;
}
/**
* This can be read by another thread when load()ing a sample to determine how many bytes need
* to be read.
*/
public synchronized long getFileSize() {
IFFParser p = parser; // prevent race
if (p != null)
return p.getFileSize();
else
return 0;
}
protected SampleMarker findOrCreateCuePoint(int uniqueID) {
SampleMarker cuePoint = cueMap.get(uniqueID);
if (cuePoint == null) {
cuePoint = new SampleMarker();
cueMap.put(uniqueID, cuePoint);
}
return cuePoint;
}
public FloatSample load(IFFParser parser) throws IOException {
this.parser = parser;
parser.parseAfterHead(this);
return finish();
}
abstract FloatSample finish() throws IOException;
FloatSample makeSample(float[] floatData) throws IOException {
FloatSample floatSample = new FloatSample(floatData, samplesPerFrame);
floatSample.setChannelsPerFrame(samplesPerFrame);
floatSample.setFrameRate(frameRate);
floatSample.setPitch(originalPitch);
if (sustainBegin >= 0) {
floatSample.setSustainBegin(sustainBegin);
floatSample.setSustainEnd(sustainEnd);
}
for (SampleMarker marker : cueMap.values()) {
floatSample.addMarker(marker);
}
/* Set Sustain Loop by assuming first two markers are loop points. */
if (floatSample.getMarkerCount() >= 2) {
floatSample.setSustainBegin(floatSample.getMarker(0).position);
floatSample.setSustainEnd(floatSample.getMarker(1).position);
}
return floatSample;
}
protected String parseString(IFFParser parser, int textLength) throws IOException {
byte[] bar = new byte[textLength];
parser.read(bar);
return new String(bar);
}
}
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