USBDevice stack
Dependents: erg USBSerial_HelloWorld Slingshot SuperScanner ... more
Diff: USBMIDI/MIDIMessage.h
- Revision:
- 0:140cdf8e2d60
diff -r 000000000000 -r 140cdf8e2d60 USBMIDI/MIDIMessage.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/USBMIDI/MIDIMessage.h Wed May 30 18:28:11 2012 +0000 @@ -0,0 +1,250 @@ +/* Copyright (c) 2010-2011 mbed.org, MIT License +* +* Permission is hereby granted, free of charge, to any person obtaining a copy of this software +* and associated documentation files (the "Software"), to deal in the Software without +* restriction, including without limitation the rights to use, copy, modify, merge, publish, +* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the +* Software is furnished to do so, subject to the following conditions: +* +* The above copyright notice and this permission notice shall be included in all copies or +* substantial portions of the Software. +* +* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING +* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, +* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. +*/ + +#ifndef MIDIMESSAGE_H +#define MIDIMESSAGE_H + +#include "mbed.h" + +// MIDI Message Format +// +// [ msg(4) | channel(4) ] [ 0 | n(7) ] [ 0 | m(7) ] +// +// MIDI Data Messages (Channel Specific) +// +// Message msg n m +// --------------------------------------------- +// Note Off 0x8 Key Velocity +// Note On 0x9 Key Velocity +// Polyphonic Aftertouch 0xA Key Pressure +// Control Change 0xB Controller Value +// Program Change 0xC Program - +// Channel Aftertouch 0xD Pressure - +// Pitch Wheel 0xE LSB MSB + +#define CABLE_NUM (0<<4) + +/** A MIDI message container */ +class MIDIMessage { +public: + MIDIMessage() {} + + MIDIMessage(uint8_t *buf) { + *((uint32_t *)data) = *((uint32_t *)buf); + } + + // create messages + + /** Create a NoteOff message + * @param key Key ID + * @param velocity Key velocity (0-127, default = 127) + * @param channel Key channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage NoteOff(int key, int velocity = 127, int channel = 0) { + MIDIMessage msg; + msg.data[0] = CABLE_NUM | 0x08; + msg.data[1] = 0x80 | (channel & 0x0F); + msg.data[2] = key & 0x7F; + msg.data[3] = velocity & 0x7F; + return msg; + } + + /** Create a NoteOn message + * @param key Key ID + * @param velocity Key velocity (0-127, default = 127) + * @param channel Key channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage NoteOn(int key, int velocity = 127, int channel = 0) { + MIDIMessage msg; + msg.data[0] = CABLE_NUM | 0x09; + msg.data[1] = 0x90 | (channel & 0x0F); + msg.data[2] = key & 0x7F; + msg.data[3] = velocity & 0x7F; + return msg; + } + + /** Create a PolyPhonic Aftertouch message + * @param key Key ID + * @param pressure Aftertouch pressure (0-127) + * @param channel Key channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage PolyphonicAftertouch(int key, int pressure, int channel = 0) { + MIDIMessage msg; + msg.data[0] = CABLE_NUM | 0x0A; + msg.data[1] = 0xA0 | (channel & 0x0F); + msg.data[2] = key & 0x7F; + msg.data[3] = pressure & 0x7F; + return msg; + } + + /** Create a Control Change message + * @param control Controller ID + * @param value Controller value (0-127) + * @param channel Controller channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage ControlChange(int control, int value, int channel = 0) { + MIDIMessage msg; + msg.data[0] = CABLE_NUM | 0x0B; + msg.data[1] = 0xB0 | (channel & 0x0F); + msg.data[2] = control & 0x7F; + msg.data[3] = value & 0x7F; + return msg; + } + + /** Create a Program Change message + * @param program Program ID + * @param channel Channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage ProgramChange(int program, int channel = 0) { + MIDIMessage msg; + msg.data[0] = CABLE_NUM | 0x0C; + msg.data[1] = 0xC0 | (channel & 0x0F); + msg.data[2] = program & 0x7F; + msg.data[3] = 0x00; + return msg; + } + + /** Create a Channel Aftertouch message + * @param pressure Pressure + * @param channel Key channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage ChannelAftertouch(int pressure, int channel = 0) { + MIDIMessage msg; + msg.data[0] = CABLE_NUM | 0x0D; + msg.data[1] = 0xD0 | (channel & 0x0F); + msg.data[2] = pressure & 0x7F; + msg.data[3] = 0x00; + return msg; + } + + /** Create a Pitch Wheel message + * @param pitch Pitch (-8192 - 8191, default = 0) + * @param channel Channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage PitchWheel(int pitch = 0, int channel = 0) { + MIDIMessage msg; + int p = pitch + 8192; // 0 - 16383, 8192 is center + msg.data[0] = CABLE_NUM | 0x0E; + msg.data[1] = 0xE0 | (channel & 0x0F); + msg.data[2] = p & 0x7F; + msg.data[3] = (p >> 7) & 0x7F; + return msg; + } + + /** Create an All Notes Off message + * @param channel Channel (0-15, default 0) + * @returns A MIDIMessage + */ + static MIDIMessage AllNotesOff(int channel = 0) { + return ControlChange(123, 0, channel); + } + + // decode messages + + /** MIDI Message Types */ + enum MIDIMessageType { + ErrorType, + NoteOffType, + NoteOnType, + PolyphonicAftertouchType, + ControlChangeType, + ProgramChangeType, + ChannelAftertouchType, + PitchWheelType, + AllNotesOffType + }; + + /** Read the message type + * @returns MIDIMessageType + */ + MIDIMessageType type() { + switch((data[1] >> 4) & 0xF) { + case 0x8: return NoteOffType; + case 0x9: return NoteOnType; + case 0xA: return PolyphonicAftertouchType; + case 0xB: + if(controller() < 120) { // standard controllers + return ControlChangeType; + } else if(controller() == 123) { + return AllNotesOffType; + } else { + return ErrorType; // unsupported atm + } + case 0xC: return ProgramChangeType; + case 0xD: return ChannelAftertouchType; + case 0xE: return PitchWheelType; + default: return ErrorType; + } + } + + /** Read the channel number */ + int channel() { + return (data[1] & 0x0F); + } + + /** Read the key ID */ + int key() { + return (data[2] & 0x7F); + } + + /** Read the velocity */ + int velocity() { + return (data[3] & 0x7F); + } + + /** Read the controller value */ + int value() { + return (data[3] & 0x7F); + } + + /** Read the aftertouch pressure */ + int pressure() { + if(type() == PolyphonicAftertouchType) { + return (data[3] & 0x7F); + } else { + return (data[2] & 0x7F); + } + } + + /** Read the controller number */ + int controller() { + return (data[2] & 0x7F); + } + + /** Read the program number */ + int program() { + return (data[2] & 0x7F); + } + + /** Read the pitch value */ + int pitch() { + int p = ((data[3] & 0x7F) << 7) | (data[2] & 0x7F); + return p - 8192; // 0 - 16383, 8192 is center + } + + uint8_t data[4]; +}; + +#endif