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284 lines
8.8 KiB
284 lines
8.8 KiB
/*
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* Copyright 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.levien.synthesizer.core.midi;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* MessageInputProcessor takes Midi messages from an input stream and dispatches them to a
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* MidiListener.
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* @see MidiListener
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*/
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public class MessageInputProcessor {
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/**
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* Creates a new MessageInputProcessor.
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*/
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public MessageInputProcessor() {
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previousCode_ = 0;
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}
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/**
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* Reads one Midi message from input and dispatches any events to a listener.
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*/
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public void process(InputStream input, MidiListener listener) throws IOException {
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previousCode_ = process(input, previousCode_, listener);
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}
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/**
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* Reads one Midi message from input and dispatches any events to a listener.
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* @param input - The stream to read from.
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* @param previousCode - The previous message code in the stream, for "running status" encoding.
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* @param listener - The object to handle the event.
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*/
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public static int process(InputStream input,
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int previousCode,
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MidiListener listener) throws IOException {
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if (!input.markSupported()) {
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throw new IOException("process() requires an InputStream that supports mark().");
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}
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input.mark(1);
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int code = MidiUtil.readByte(input);
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if ((code & 0x80) == 0 && previousCode != 0) {
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code = previousCode;
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input.reset();
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}
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if (code == 0xFF) {
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processMetaMessage(input, listener);
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} else if (code == 0xFE) {
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listener.onActiveSensing();
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} else if (code == 0xF8) {
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listener.onTimingClock();
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} else if (code == 0xF0 || code == 0xF7) {
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processSysExMessage(input, listener);
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} else if ((code & 0x80) == 0x80 && (code & 0xF0) != 0xF0) {
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processControlMessage(input, code, listener);
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} else {
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throw new IOException("Invalid midi event code " + code + ".");
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}
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return code;
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}
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/**
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* Processes control messages.
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* @param input - The stream to read from.
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* @param code - The code of the event, which has the type and the channel.
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* @param listener - The object to handle the event.
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*/
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private static void processControlMessage(InputStream input,
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int code,
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MidiListener listener) throws IOException {
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int type = (code & 0xF0);
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int channel = (code & 0x0F);
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switch (type) {
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case 0x80: {
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int note = MidiUtil.readByte(input);
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int velocity = MidiUtil.readByte(input);
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listener.onNoteOff(channel, note, velocity);
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break;
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}
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case 0x90: {
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int note = MidiUtil.readByte(input);
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int velocity = MidiUtil.readByte(input);
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listener.onNoteOn(channel, note, velocity);
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break;
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}
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case 0xA0: {
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int note = MidiUtil.readByte(input);
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int aftertouch = MidiUtil.readByte(input);
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listener.onNoteAftertouch(channel, note, aftertouch);
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break;
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}
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case 0xB0: {
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int control = MidiUtil.readByte(input);
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int value = MidiUtil.readByte(input);
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listener.onController(channel, control, value);
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break;
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}
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case 0xC0: {
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int program = MidiUtil.readByte(input);
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listener.onProgramChange(channel, program);
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break;
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}
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case 0xD0: {
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int aftertouch = MidiUtil.readByte(input);
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listener.onChannelAftertouch(channel, aftertouch);
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break;
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}
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case 0xE0: {
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int value = MidiUtil.readWord(input);
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listener.onPitchBend(channel, value);
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break;
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}
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default: {
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throw new IOException("Invalid midi control message type " + type + ".");
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}
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}
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}
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/**
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* Processes meta messages.
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* @param input - The stream to read from.
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* @param listener - The object to handle the event.
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*/
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private static void processMetaMessage(InputStream input,
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MidiListener listener) throws IOException {
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int type = MidiUtil.readByte(input);
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int size = MidiUtil.readVarInt(input);
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switch (type) {
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case 0x00: {
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if (size != 2) {
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throw new IOException("Invalid length for sequence meta event " + size + ".");
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}
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listener.onSequenceNumber(MidiUtil.readWord(input));
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break;
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}
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case 0x01: {
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byte[] text = new byte[size];
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MidiUtil.readBytes(input, size, text);
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listener.onText(text);
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break;
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}
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case 0x02: {
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byte[] text = new byte[size];
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MidiUtil.readBytes(input, size, text);
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listener.onCopyrightNotice(text);
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break;
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}
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case 0x03: {
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byte[] text = new byte[size];
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MidiUtil.readBytes(input, size, text);
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listener.onSequenceName(text);
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break;
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}
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case 0x04: {
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byte[] text = new byte[size];
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MidiUtil.readBytes(input, size, text);
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listener.onInstrumentName(text);
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break;
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}
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case 0x05: {
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byte[] text = new byte[size];
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MidiUtil.readBytes(input, size, text);
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listener.onLyrics(text);
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break;
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}
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case 0x06: {
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byte[] text = new byte[size];
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MidiUtil.readBytes(input, size, text);
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listener.onMarker(text);
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break;
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}
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case 0x07: {
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byte[] text = new byte[size];
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MidiUtil.readBytes(input, size, text);
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listener.onCuePoint(text);
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break;
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}
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case 0x20: {
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if (size != 1) {
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throw new IOException("Invalid length for midi channel prefix " + size + ".");
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}
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listener.onChannelPrefix(MidiUtil.readByte(input));
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break;
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}
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case 0x21: {
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byte[] data = new byte[size];
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MidiUtil.readBytes(input, size, data);
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listener.onPort(data);
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break;
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}
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case 0x2F: {
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if (size != 0) {
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throw new IOException("Invalid length for end of track " + size + ".");
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}
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listener.onEndOfTrack();
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break;
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}
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case 0x51: {
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if (size != 3) {
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throw new IOException("Invalid length for set tempo event " + size + ".");
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}
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// Stupid 3-byte value.
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int w = MidiUtil.readWord(input);
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int b = MidiUtil.readByte(input);
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int mspqn = (w << 8) | b;
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listener.onSetTempo(mspqn);
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break;
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}
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case 0x54: {
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if (size != 5) {
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throw new IOException("Invalid length for smpte offset event " + size + ".");
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}
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byte[] data = new byte[size];
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MidiUtil.readBytes(input, size, data);
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listener.onSmpteOffset(data);
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break;
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}
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case 0x58: {
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if (size != 4) {
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throw new IOException("Invalid length for time signature event " + size + ".");
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}
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int numerator = MidiUtil.readByte(input);
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int denominator = MidiUtil.readByte(input);
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int metronomePulse = MidiUtil.readByte(input);
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int thirtySecondNotesPerQuarterNote = MidiUtil.readByte(input);
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listener.onTimeSignature(numerator,
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denominator,
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metronomePulse,
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thirtySecondNotesPerQuarterNote);
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break;
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}
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case 0x59: {
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if (size != 2) {
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throw new IOException("Invalid length for key signature event " + size + ".");
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}
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int key = MidiUtil.readByte(input);
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boolean isMinor = (MidiUtil.readByte(input) != 0);
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listener.onKeySignature(key, isMinor);
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break;
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}
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case 0x7F: {
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byte[] data = new byte[size];
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MidiUtil.readBytes(input, size, data);
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listener.onSequencerSpecificEvent(data);
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break;
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}
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default: {
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throw new IOException("Invalid midi meta message type " + type + ".");
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}
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}
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}
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/**
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* Processes SysEx messages.
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* @param input - The stream to read from.
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* @param listener - The object to handle the event.
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*/
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private static void processSysExMessage(InputStream input,
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MidiListener listener) throws IOException {
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int size = MidiUtil.readVarInt(input);
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byte[] data = new byte[size];
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MidiUtil.readBytes(input, size, data);
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listener.onSysEx(data);
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}
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// The most recent code seen in the stream, used for "running status" encoding.
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int previousCode_;
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}
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