dumpsequence.java

java处理声音文件

/*
 *	DumpSequence.java
 *
 *	Displays the content of a MIDI file.
 *	This file is part of the JavaSound Examples.
 */

/*
 *  Copyright (c) 1999, 2000 by Matthias Pfisterer <[e-mail]>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published
 *   by the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public
 *   License along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

import	java.io.File;
import	java.io.IOException;

import	javax.sound.midi.MidiSystem;
import	javax.sound.midi.InvalidMidiDataException;
import	javax.sound.midi.Sequence;
import	javax.sound.midi.Track;
import	javax.sound.midi.MidiEvent;
import	javax.sound.midi.MidiMessage;
import	javax.sound.midi.ShortMessage;
import	javax.sound.midi.MetaMessage;
import	javax.sound.midi.SysexMessage;
import	javax.sound.midi.Receiver;




public class DumpSequence
{
	private static String[]	sm_astrKeyNames = {"C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"};

	private static Receiver		sm_receiver = new DumpReceiver(System.out, true);




	public static void main(String[] args)
	{
		/*
		 *	We check that there is exactely one command-line
		 *	argument. If not, we display the usage message and
		 *	exit.
		 */
		if (args.length != 1)
		{
			System.out.println("DumpSequence: usage:");
			System.out.println("\tjava DumpSequence <midifile>");
			System.exit(1);
		}
		/*
		 *	Now, that we're shure there is an argument, we take it as
		 *	the filename of the soundfile we want to play.
		 */
		String	strFilename = args[0];
		File	midiFile = new File(strFilename);

		/*
		 *	We try to get a Sequence object, which the content
		 *	of the MIDI file.
		 */
		Sequence	sequence = null;
		try
		{
			sequence = MidiSystem.getSequence(midiFile);
		}
		catch (InvalidMidiDataException e)
		{
			e.printStackTrace();
			System.exit(1);
		}
		catch (IOException e)
		{
			e.printStackTrace();
			System.exit(1);
		}

		/*
		 *	And now, we output the data.
		 */
		if (sequence == null)
		{
			System.out.println("Cannot retrieve Sequence.");
		}
		else
		{
			System.out.println("---------------------------------------------------------------------------");
			System.out.println("File: " + strFilename);
			System.out.println("---------------------------------------------------------------------------");
			System.out.println("Length: " + sequence.getTickLength() + " ticks");
			System.out.println("Duration: " + sequence.getMicrosecondLength() + " microseconds");
			System.out.println("---------------------------------------------------------------------------");
			float	fDivisionType = sequence.getDivisionType();
			String	strDivisionType = null;
			if (fDivisionType == Sequence.PPQ)
			{
				strDivisionType = "PPQ";
			}
			else if (fDivisionType == Sequence.SMPTE_24)
			{
				strDivisionType = "SMPTE, 24 frames per second";
			}
			else if (fDivisionType == Sequence.SMPTE_25)
			{
				strDivisionType = "SMPTE, 25 frames per second";
			}
			else if (fDivisionType == Sequence.SMPTE_30DROP)
			{
				strDivisionType = "SMPTE, 29.97 frames per second";
			}
			else if (fDivisionType == Sequence.SMPTE_30)
			{
				strDivisionType = "SMPTE, 30 frames per second";
			}

			System.out.println("DivisionType: " + strDivisionType);

			String	strResolutionType = null;
			if (sequence.getDivisionType() == Sequence.PPQ)
			{
				strResolutionType = " ticks per beat";
			}
			else
			{
				strResolutionType = " ticks per frame";
			}
			System.out.println("Resolution: " + sequence.getResolution() + strResolutionType);
			System.out.println("---------------------------------------------------------------------------");
			Track[]	tracks = sequence.getTracks();
			for (int nTrack = 0; nTrack < tracks.length; nTrack++)
			{
				System.out.println("Track " + nTrack + ":");
				System.out.println("-----------------------");
				Track	track = tracks[nTrack];
				for (int nEvent = 0; nEvent < track.size(); nEvent++)
				{
					MidiEvent	event = track.get(nEvent);
					output(event);
				}
				System.out.println("---------------------------------------------------------------------------");
			}
			// TODO: getPatchList()
		}
	}


	public static void output(MidiEvent event)
	{
		MidiMessage	message = event.getMessage();
		long		lTicks = event.getTick();
		sm_receiver.send(message, lTicks);
	}
}



/*** DumpSequence.java ***/