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/*
* Copyright 2010 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.midi;
/**
* Parse the message and call the appropriate method to handle it.
*
* @author Phil Burk (C) 2010 Mobileer Inc
*/
public class MessageParser {
private int[] parameterIndices = new int[MidiConstants.MAX_CHANNELS];
private int[] parameterValues = new int[MidiConstants.MAX_CHANNELS];
private int BIT_NON_RPM = 1 << 14;
private int MASK_14BIT = (1 << 14) - 1;
public void parse(byte[] message) {
parse(message, /* offset= */ 0, message.length);
}
public void parse(byte[] message, int offset, int length) {
checkMessageLength(/* expectedLength= */ 1, length);
int status = message[offset];
int command = status & 0xF0;
int channel = status & 0x0F;
switch (command) {
case MidiConstants.NOTE_ON:
checkMessageLength(/* expectedLength= */ 3, length);
int velocity = message[offset + 2];
if (velocity == 0) {
noteOff(channel, message[offset + 1], velocity);
} else {
noteOn(channel, message[offset + 1], velocity);
}
break;
case MidiConstants.NOTE_OFF:
checkMessageLength(/* expectedLength= */ 3, length);
noteOff(channel, message[offset + 1], message[offset + 2]);
break;
case MidiConstants.POLYPHONIC_AFTERTOUCH:
checkMessageLength(/* expectedLength= */ 3, length);
polyphonicAftertouch(channel, message[offset + 1], message[offset + 2]);
break;
case MidiConstants.CHANNEL_PRESSURE:
checkMessageLength(/* expectedLength= */ 2, length);
channelPressure(channel, message[offset + 1]);
break;
case MidiConstants.CONTROL_CHANGE:
checkMessageLength(/* expectedLength= */ 3, length);
rawControlChange(channel, message[offset + 1], message[offset + 2]);
break;
case MidiConstants.PROGRAM_CHANGE:
checkMessageLength(/* expectedLength= */ 2, length);
programChange(channel, message[offset + 1]);
break;
case MidiConstants.PITCH_BEND:
checkMessageLength(/* expectedLength= */ 3, length);
int bend = (message[offset + 2] << 7) + message[offset + 1];
pitchBend(channel, bend);
break;
default:
break; // We ignore unsupported commands.
}
}
public void rawControlChange(int channel, int index, int value) {
int paramIndex;
int paramValue;
switch (index) {
case MidiConstants.CONTROLLER_DATA_ENTRY:
parameterValues[channel] = value << 7;
fireParameterChange(channel);
break;
case MidiConstants.CONTROLLER_DATA_ENTRY_LSB:
paramValue = parameterValues[channel] & ~0x7F;
paramValue |= value;
parameterValues[channel] = paramValue;
fireParameterChange(channel);
break;
case MidiConstants.CONTROLLER_NRPN_LSB:
paramIndex = parameterIndices[channel] & ~0x7F;
paramIndex |= value | BIT_NON_RPM;
parameterIndices[channel] = paramIndex;
break;
case MidiConstants.CONTROLLER_NRPN_MSB:
parameterIndices[channel] = (value << 7) | BIT_NON_RPM;
break;
case MidiConstants.CONTROLLER_RPN_LSB:
paramIndex = parameterIndices[channel] & ~0x7F;
paramIndex |= value;
parameterIndices[channel] = paramIndex;
break;
case MidiConstants.CONTROLLER_RPN_MSB:
parameterIndices[channel] = value << 7;
break;
default:
controlChange(channel, index, value);
break;
}
}
private void fireParameterChange(int channel) {
int paramIndex;
paramIndex = parameterIndices[channel];
if ((paramIndex & BIT_NON_RPM) == 0) {
registeredParameter(channel, paramIndex, parameterValues[channel]);
} else {
nonRegisteredParameter(channel, paramIndex & MASK_14BIT, parameterValues[channel]);
}
}
private void checkMessageLength(int expectedLength, int actualLength) {
if (actualLength < expectedLength) {
throw new IllegalArgumentException("Expected message of at least " + expectedLength
+ " bytes but got " + actualLength + " bytes.");
}
}
public void nonRegisteredParameter(int channel, int index14, int value14) {
}
public void registeredParameter(int channel, int index14, int value14) {
}
public void pitchBend(int channel, int bend) {
}
public void programChange(int channel, int program) {
}
public void polyphonicAftertouch(int channel, int pitch, int pressure) {
}
public void channelPressure(int channel, int pressure) {
}
public void controlChange(int channel, int index, int value) {
}
public void noteOn(int channel, int pitch, int velocity) {
}
// If a NOTE_ON with zero velocity is received then noteOff will be called.
public void noteOff(int channel, int pitch, int velocity) {
}
}
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