| /* |
| * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.media.sound; |
| |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import javax.sound.midi.InvalidMidiDataException; |
| import javax.sound.midi.MetaMessage; |
| import javax.sound.midi.MidiEvent; |
| import javax.sound.midi.MidiMessage; |
| import javax.sound.midi.MidiSystem; |
| import javax.sound.midi.MidiUnavailableException; |
| import javax.sound.midi.Receiver; |
| import javax.sound.midi.Sequence; |
| import javax.sound.midi.Track; |
| import javax.sound.sampled.AudioFileFormat.Type; |
| import javax.sound.sampled.AudioFormat; |
| import javax.sound.sampled.AudioInputStream; |
| import javax.sound.sampled.UnsupportedAudioFileException; |
| |
| /** |
| * MIDI File Audio Renderer/Reader. |
| * |
| * @author Karl Helgason |
| */ |
| public final class SoftMidiAudioFileReader extends SunFileReader { |
| |
| private static final Type MIDI = new Type("MIDI", "mid"); |
| |
| private static final AudioFormat format = new AudioFormat(44100, 16, 2, |
| true, false); |
| |
| private static StandardFileFormat getAudioFileFormat(final Sequence seq) { |
| long totallen = seq.getMicrosecondLength() / 1000000; |
| long len = (long) (format.getFrameRate() * (totallen + 4)); |
| return new StandardFileFormat(MIDI, format, len); |
| } |
| |
| private AudioInputStream getAudioInputStream(final Sequence seq) |
| throws InvalidMidiDataException { |
| AudioSynthesizer synth = new SoftSynthesizer(); |
| AudioInputStream stream; |
| Receiver recv; |
| try { |
| stream = synth.openStream(format, null); |
| recv = synth.getReceiver(); |
| } catch (MidiUnavailableException e) { |
| throw new InvalidMidiDataException(e.toString()); |
| } |
| float divtype = seq.getDivisionType(); |
| Track[] tracks = seq.getTracks(); |
| int[] trackspos = new int[tracks.length]; |
| int mpq = 500000; |
| int seqres = seq.getResolution(); |
| long lasttick = 0; |
| long curtime = 0; |
| while (true) { |
| MidiEvent selevent = null; |
| int seltrack = -1; |
| for (int i = 0; i < tracks.length; i++) { |
| int trackpos = trackspos[i]; |
| Track track = tracks[i]; |
| if (trackpos < track.size()) { |
| MidiEvent event = track.get(trackpos); |
| if (selevent == null || event.getTick() < selevent.getTick()) { |
| selevent = event; |
| seltrack = i; |
| } |
| } |
| } |
| if (seltrack == -1) |
| break; |
| trackspos[seltrack]++; |
| long tick = selevent.getTick(); |
| if (divtype == Sequence.PPQ) |
| curtime += ((tick - lasttick) * mpq) / seqres; |
| else |
| curtime = (long) ((tick * 1000000.0 * divtype) / seqres); |
| lasttick = tick; |
| MidiMessage msg = selevent.getMessage(); |
| if (msg instanceof MetaMessage) { |
| if (divtype == Sequence.PPQ) { |
| if (((MetaMessage) msg).getType() == 0x51) { |
| byte[] data = ((MetaMessage) msg).getData(); |
| if (data.length < 3) { |
| throw new InvalidMidiDataException(); |
| } |
| mpq = ((data[0] & 0xff) << 16) |
| | ((data[1] & 0xff) << 8) | (data[2] & 0xff); |
| } |
| } |
| } else { |
| recv.send(msg, curtime); |
| } |
| } |
| |
| long totallen = curtime / 1000000; |
| long len = (long) (stream.getFormat().getFrameRate() * (totallen + 4)); |
| stream = new AudioInputStream(stream, stream.getFormat(), len); |
| return stream; |
| } |
| |
| @Override |
| public AudioInputStream getAudioInputStream(final InputStream stream) |
| throws UnsupportedAudioFileException, IOException { |
| stream.mark(200); |
| try { |
| return getAudioInputStream(MidiSystem.getSequence(stream)); |
| } catch (InvalidMidiDataException | EOFException ignored) { |
| // stream is unsupported or the header is less than was expected |
| stream.reset(); |
| throw new UnsupportedAudioFileException(); |
| } |
| } |
| |
| @Override |
| StandardFileFormat getAudioFileFormatImpl(final InputStream stream) |
| throws UnsupportedAudioFileException, IOException { |
| try { |
| return getAudioFileFormat(MidiSystem.getSequence(stream)); |
| } catch (final InvalidMidiDataException ignored) { |
| throw new UnsupportedAudioFileException(); |
| } |
| } |
| } |