277 lines
8.4 KiB
C
277 lines
8.4 KiB
C
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/* Copyright (c) 2010-2011 mbed.org, MIT License
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef MIDIMESSAGE_H
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#define MIDIMESSAGE_H
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#include "mbed.h"
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#define MAX_MIDI_MESSAGE_SIZE 256 // Max message size. SysEx can be up to 65536 but 256 should be fine for most usage
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// MIDI Message Format
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//
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// [ msg(4) | channel(4) ] [ 0 | n(7) ] [ 0 | m(7) ]
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//
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// MIDI Data Messages (Channel Specific)
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//
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// Message msg n m
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// ---------------------------------------------
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// Note Off 0x8 Key Velocity
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// Note On 0x9 Key Velocity
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// Polyphonic Aftertouch 0xA Key Pressure
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// Control Change 0xB Controller Value
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// Program Change 0xC Program -
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// Channel Aftertouch 0xD Pressure -
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// Pitch Wheel 0xE LSB MSB
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#define CABLE_NUM (0<<4)
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/** A MIDI message container */
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class MIDIMessage {
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public:
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MIDIMessage() : length(4) {}
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MIDIMessage(uint8_t *buf) : length(4) {
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for (int i = 0; i < 4; i++)
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data[i] = buf[i];
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}
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// New constructor, buf is a true MIDI message (not USBMidi message) and buf_len true message length.
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MIDIMessage(uint8_t *buf, int buf_len) {
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length=buf_len+1;
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// first byte keeped for retro-compatibility
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data[0]=0;
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for (int i = 0; i < buf_len; i++)
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data[i+1] = buf[i];
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}
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// create messages
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/** Create a NoteOff message
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* @param key Key ID
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* @param velocity Key velocity (0-127, default = 127)
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* @param channel Key channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage NoteOff(int key, int velocity = 127, int channel = 0) {
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MIDIMessage msg;
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msg.data[0] = CABLE_NUM | 0x08;
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msg.data[1] = 0x80 | (channel & 0x0F);
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msg.data[2] = key & 0x7F;
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msg.data[3] = velocity & 0x7F;
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return msg;
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}
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/** Create a NoteOn message
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* @param key Key ID
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* @param velocity Key velocity (0-127, default = 127)
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* @param channel Key channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage NoteOn(int key, int velocity = 127, int channel = 0) {
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MIDIMessage msg;
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msg.data[0] = CABLE_NUM | 0x09;
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msg.data[1] = 0x90 | (channel & 0x0F);
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msg.data[2] = key & 0x7F;
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msg.data[3] = velocity & 0x7F;
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return msg;
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}
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/** Create a PolyPhonic Aftertouch message
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* @param key Key ID
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* @param pressure Aftertouch pressure (0-127)
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* @param channel Key channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage PolyphonicAftertouch(int key, int pressure, int channel = 0) {
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MIDIMessage msg;
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msg.data[0] = CABLE_NUM | 0x0A;
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msg.data[1] = 0xA0 | (channel & 0x0F);
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msg.data[2] = key & 0x7F;
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msg.data[3] = pressure & 0x7F;
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return msg;
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}
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/** Create a Control Change message
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* @param control Controller ID
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* @param value Controller value (0-127)
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* @param channel Controller channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage ControlChange(int control, int value, int channel = 0) {
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MIDIMessage msg;
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msg.data[0] = CABLE_NUM | 0x0B;
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msg.data[1] = 0xB0 | (channel & 0x0F);
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msg.data[2] = control & 0x7F;
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msg.data[3] = value & 0x7F;
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return msg;
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}
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/** Create a Program Change message
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* @param program Program ID
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* @param channel Channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage ProgramChange(int program, int channel = 0) {
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MIDIMessage msg;
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msg.data[0] = CABLE_NUM | 0x0C;
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msg.data[1] = 0xC0 | (channel & 0x0F);
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msg.data[2] = program & 0x7F;
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msg.data[3] = 0x00;
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return msg;
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}
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/** Create a Channel Aftertouch message
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* @param pressure Pressure
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* @param channel Key channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage ChannelAftertouch(int pressure, int channel = 0) {
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MIDIMessage msg;
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msg.data[0] = CABLE_NUM | 0x0D;
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msg.data[1] = 0xD0 | (channel & 0x0F);
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msg.data[2] = pressure & 0x7F;
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msg.data[3] = 0x00;
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return msg;
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}
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/** Create a Pitch Wheel message
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* @param pitch Pitch (-8192 - 8191, default = 0)
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* @param channel Channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage PitchWheel(int pitch = 0, int channel = 0) {
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MIDIMessage msg;
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int p = pitch + 8192; // 0 - 16383, 8192 is center
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msg.data[0] = CABLE_NUM | 0x0E;
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msg.data[1] = 0xE0 | (channel & 0x0F);
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msg.data[2] = p & 0x7F;
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msg.data[3] = (p >> 7) & 0x7F;
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return msg;
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}
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/** Create an All Notes Off message
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* @param channel Channel (0-15, default 0)
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* @returns A MIDIMessage
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*/
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static MIDIMessage AllNotesOff(int channel = 0) {
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return ControlChange(123, 0, channel);
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}
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/** Create a SysEx message
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* @param data SysEx data (including 0xF0 .. 0xF7)
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* @param len SysEx data length
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* @returns A MIDIMessage
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*/
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static MIDIMessage SysEx(uint8_t *data, int len) {
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MIDIMessage msg=MIDIMessage(data,len);
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return msg;
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}
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// decode messages
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/** MIDI Message Types */
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enum MIDIMessageType {
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ErrorType,
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NoteOffType,
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NoteOnType,
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PolyphonicAftertouchType,
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ControlChangeType,
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ProgramChangeType,
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ChannelAftertouchType,
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PitchWheelType,
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AllNotesOffType,
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SysExType
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};
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/** Read the message type
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* @returns MIDIMessageType
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*/
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MIDIMessageType type() {
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switch((data[1] >> 4) & 0xF) {
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case 0x8: return NoteOffType;
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case 0x9: return NoteOnType;
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case 0xA: return PolyphonicAftertouchType;
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case 0xB:
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if(controller() < 120) { // standard controllers
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return ControlChangeType;
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} else if(controller() == 123) {
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return AllNotesOffType;
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} else {
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return ErrorType; // unsupported atm
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}
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case 0xC: return ProgramChangeType;
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case 0xD: return ChannelAftertouchType;
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case 0xE: return PitchWheelType;
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case 0xF: return SysExType;
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default: return ErrorType;
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}
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}
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/** Read the channel number */
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int channel() {
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return (data[1] & 0x0F);
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}
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/** Read the key ID */
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int key() {
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return (data[2] & 0x7F);
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}
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/** Read the velocity */
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int velocity() {
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return (data[3] & 0x7F);
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}
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/** Read the controller value */
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int value() {
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return (data[3] & 0x7F);
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}
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/** Read the aftertouch pressure */
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int pressure() {
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if(type() == PolyphonicAftertouchType) {
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return (data[3] & 0x7F);
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} else {
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return (data[2] & 0x7F);
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}
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}
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/** Read the controller number */
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int controller() {
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return (data[2] & 0x7F);
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}
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/** Read the program number */
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int program() {
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return (data[2] & 0x7F);
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}
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/** Read the pitch value */
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int pitch() {
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int p = ((data[3] & 0x7F) << 7) | (data[2] & 0x7F);
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return p - 8192; // 0 - 16383, 8192 is center
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}
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uint8_t data[MAX_MIDI_MESSAGE_SIZE+1];
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uint8_t length;
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};
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#endif
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