1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #import <Foundation/Foundation.h> 18 19 /** 20 * A MIDI channel number. 21 * 22 * Note that the first channel is '1'. 23 */ 24 typedef uint8_t MIDIChannel; 25 typedef uint8_t MIDIByte; 26 27 typedef NS_ENUM(MIDIByte, MIDIMessageType) { 28 // Channel messages 29 MIDIMessageNoteOff = 0x08, 30 MIDIMessageNoteOn = 0x09, 31 MIDIMessageKeyPressure = 0x0A, 32 MIDIMessageControlChange = 0x0B, 33 MIDIMessageProgramChange = 0x0C, 34 MIDIMessageChannelPressure = 0x0D, 35 MIDIMessagePitchBend = 0x0E, 36 37 // System messages 38 MIDIMessageSysEx = 0xF0, 39 MIDIMessageQuarterFrame = 0xF1, 40 MIDIMessageSongPosition = 0xF2, 41 MIDIMessageSongSelect = 0xF3, 42 MIDIMessageTuneRequest = 0xF6, 43 MIDIMessageSysExEnd = 0xF7, 44 MIDIMessageTimingClock = 0xF8, 45 MIDIMessageStart = 0xFA, 46 MIDIMessageContinue = 0xFB, 47 MIDIMessageStop = 0xFC, 48 MIDIMessageActiveSensing = 0xFE, 49 MIDIMessageReset = 0xFF, 50 }; 51 52 extern const MIDIChannel kMIDINoChannel; 53 54 #pragma mark Message Parsing 55 56 /** Returns the MIDIMessageType for a given status byte. */ 57 MIDIMessageType MIDIMessageTypeFromStatus(MIDIByte status); 58 59 /** 60 * Returns the MIDIChannel for a given status byte, or kMIDINoChannel if the status byte does not 61 * describe a channel message. 62 */ 63 MIDIChannel MIDIChannelFromStatus(MIDIByte status); 64 65 /** 66 * Returns the body portion from a complete MIDI message (i.e., without leading or trailing data). 67 */ 68 NSData *MIDIMessageBody(NSData *message); 69 70 #pragma mark Message Building 71 72 /** Returns the MIDI status byte for a message type sent to a particular channel. */ 73 MIDIByte MIDIStatusByte(MIDIMessageType type, MIDIChannel channel); 74 75 /** Creates a complete MIDI message packet for a given message type, channel, and its body. */ 76 NSData *MIDIMessageCreate(MIDIMessageType type, MIDIChannel channel, NSData *body); 77 78 /** Creates a complete MIDI message packet for a simple message containing one data byte. */ 79 NSData *MIDIMessageCreateSimple1(MIDIMessageType type, MIDIChannel channel, MIDIByte first); 80 81 /** Creates a complete MIDI message packet for a simple message containing two data bytes. */ 82 NSData *MIDIMessageCreateSimple2(MIDIMessageType type, 83 MIDIChannel channel, 84 MIDIByte first, 85 MIDIByte second); 86
