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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);
+ }
+}