Android解析midi文件

package com.buaa.read; import java.io.File; import java.io.FileInputStream; import java.nio.ByteBuffer; import java.util.ArrayList; import java.util.List; public class ReadMidi { /** * 获取midi信息 * * @param midiFile * @throws Exception */ public void readDateFIle(File midiFile) throws Exception { FileInputStream stream = new FileInputStream(midiFile); byte[] data = new byte[stream.available()]; stream.read(data); ByteBuffer byteBuffer = ByteBuffer.wrap(data); // 调用获取MTHD信息方法得到头部信息 HeaderChunks headerChunks = this.readHeaderChunks(byteBuffer); List<TrackChunk> trackChunklist = this.readTreackChunks(byteBuffer, headerChunks); this.outInforMidi(headerChunks, trackChunklist); } public void outInforMidi(HeaderChunks headerChunks, List<TrackChunk> trackChunklist) { System.out.println("-------------MThd-----------------"); System.out.println("头块类型:" + new String(headerChunks.getMidiId())); System.out.println("头块长度:" + headerChunks.getLength()); System.out.println("格式:" + headerChunks.getFormat()); System.out.println("音轨数:" + headerChunks.getTrackNumber()); System.out.println("分区:" + headerChunks.getMidiTimeSet()); for (int i = 0; i < trackChunklist.size(); i++) { System.out.println("-------------MTrk-----------------"); System.out.println("音轨块" + i + ":" + new String(trackChunklist.get(i).getMidiId())); System.out.println("音轨数据长度:" + trackChunklist.get(i).getLength()); System.out.println("音轨数据:" + trackChunklist.get(i).getData()); } } /** * 获取头部信息MThd * * @param buffer * @return */ public HeaderChunks readHeaderChunks(ByteBuffer buffer) { HeaderChunks headerChunks = new HeaderChunks(); for (int i = 0; i < headerChunks.getMidiId().length; i++) { headerChunks.getMidiId()[i] = (byte) (buffer.get()); } headerChunks.setLength(buffer.getInt()); headerChunks.setFormat(buffer.getShort()); headerChunks.setTrackNumber(buffer.getShort()); headerChunks.setMidiTimeSet(buffer.getShort()); return headerChunks; } /** * 获取MTrk信息块 * * @param buffer * @param headerChunks * @return */ public List<TrackChunk> readTreackChunks(ByteBuffer buffer, HeaderChunks headerChunks) { ArrayList<TrackChunk> trackChunklist = new ArrayList<TrackChunk>(); TrackChunk trackChunk; for (int i = 0; i < headerChunks.getTrackNumber(); i++) { trackChunk = new TrackChunk(); for (int j = 0; j < trackChunk.getMidiId().length; j++) { trackChunk.getMidiId()[j] = (byte) (buffer.get()); } trackChunk.setLength(buffer.getInt()); byte[] data = new byte[trackChunk.getLength()]; buffer.get(data); System.out.println(data[0]); trackChunk.setData(data); trackChunklist.add(trackChunk); } return trackChunklist; } }