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Diffstat (limited to 'src/com/jsyn/util/soundfile/AudioFileParser.java')
-rw-r--r-- | src/com/jsyn/util/soundfile/AudioFileParser.java | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/com/jsyn/util/soundfile/AudioFileParser.java b/src/com/jsyn/util/soundfile/AudioFileParser.java new file mode 100644 index 0000000..e7bb066 --- /dev/null +++ b/src/com/jsyn/util/soundfile/AudioFileParser.java @@ -0,0 +1,129 @@ +/* + * 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); + } +} |