Diff: USBDevice/USBMIDI/MIDIMessage.h

Revision:

0:7610d342c76e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice/USBMIDI/MIDIMessage.h	Sun Jan 08 17:28:24 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