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Diffstat (limited to 'src/main/java/com/jsyn/midi/MidiConstants.java')
| -rw-r--r-- | src/main/java/com/jsyn/midi/MidiConstants.java | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/main/java/com/jsyn/midi/MidiConstants.java b/src/main/java/com/jsyn/midi/MidiConstants.java new file mode 100644 index 0000000..8c92119 --- /dev/null +++ b/src/main/java/com/jsyn/midi/MidiConstants.java @@ -0,0 +1,84 @@ +/* + * 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; + +/** + * Constants that define the MIDI standard. + * + * @author Phil Burk (C) 2010 Mobileer Inc + */ +public class MidiConstants { + + public static final int MAX_CHANNELS = 16; + // Basic commands. + public static final int NOTE_OFF = 0x80; + public static final int NOTE_ON = 0x90; + public static final int POLYPHONIC_AFTERTOUCH = 0xA0; + public static final int CONTROL_CHANGE = 0xB0; + public static final int PROGRAM_CHANGE = 0xC0; + public static final int CHANNEL_AFTERTOUCH = 0xD0; + public static final int CHANNEL_PRESSURE = CHANNEL_AFTERTOUCH; + public static final int PITCH_BEND = 0xE0; + public static final int SYSTEM_COMMON = 0xF0; + + public static final int PITCH_BEND_CENTER = 0x2000; + + public static final int CONTROLLER_BANK_SELECT = 0; + public static final int CONTROLLER_MOD_WHEEL = 1; + public static final int CONTROLLER_BREATH = 2; + public static final int CONTROLLER_DATA_ENTRY = 6; + public static final int CONTROLLER_VOLUME = 7; + public static final int CONTROLLER_PAN = 10; + + public static final int CONTROLLER_LSB_OFFSET = 32; + public static final int CONTROLLER_DATA_ENTRY_LSB = CONTROLLER_DATA_ENTRY + CONTROLLER_LSB_OFFSET; + + public static final int CONTROLLER_TIMBRE = 74; // Often used by MPE for Y axis control. + + public static final int CONTROLLER_DATA_INCREMENT = 96; + public static final int CONTROLLER_DATA_DECREMENT = 97; + public static final int CONTROLLER_NRPN_LSB = 98; + public static final int CONTROLLER_NRPN_MSB = 99; + public static final int CONTROLLER_RPN_LSB = 100; + public static final int CONTROLLER_RPN_MSB = 101; + + public static final int RPN_BEND_RANGE = 0; + public static final int RPN_FINE_TUNING = 1; + + public static final String PITCH_NAMES[] = { + "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B" + }; + + /** + * Calculate frequency in Hertz based on MIDI pitch. Middle C is 60.0. You can use fractional + * pitches so 60.5 would give you a pitch half way between C and C#. + */ + static final double CONCERT_A_FREQUENCY = 440.0; + static final double CONCERT_A_PITCH = 69.0; + + public static double convertPitchToFrequency(double pitch) { + return CONCERT_A_FREQUENCY * Math.pow(2.0, ((pitch - CONCERT_A_PITCH) / 12.0)); + } + + /** + * Calculate MIDI pitch based on frequency in Hertz. Middle C is 60.0. + */ + public static double convertFrequencyToPitch(double frequency) { + return CONCERT_A_PITCH + (12 * Math.log(frequency / CONCERT_A_FREQUENCY) / Math.log(2.0)); + } + +} |