MIDI.cpp File Reference

MIDI Library for the Arduino. More...

#include "MIDI.h"

Go to the source code of this file.

Functions
BEGIN_MIDI_NAMESPACE unsigned	encodeSysEx (const byte *inData, byte *outSysEx, unsigned inLength)
	Encode System Exclusive messages. SysEx messages are encoded to guarantee transmission of data bytes higher than 127 without breaking the MIDI protocol. Use this static method to convert the data you want to send. More...
unsigned	decodeSysEx (const byte *inSysEx, byte *outData, unsigned inLength)
	Decode System Exclusive messages. SysEx messages are encoded to guarantee transmission of data bytes higher than 127 without breaking the MIDI protocol. Use this static method to reassemble your received message. More...

Detailed Description

MIDI Library for the Arduino.

Project Arduino MIDI Library

Version

4.3

Author

Francois Best

Date

24/02/11 MIT - Copyright (c) 2015 Francois Best

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.

Definition in file MIDI.cpp.

Function Documentation

decodeSysEx()

unsigned decodeSysEx	(	const byte *	inSysEx,
		byte *	outData,
		unsigned	inLength
	)

Decode System Exclusive messages. SysEx messages are encoded to guarantee transmission of data bytes higher than 127 without breaking the MIDI protocol. Use this static method to reassemble your received message.

Parameters

inSysEx	The SysEx data received from MIDI in.
outData	The output buffer where to store the decrypted message.
inLength	The lenght of the input buffer.

Returns

The lenght of the output buffer.

See also

encodeSysEx

getSysExArrayLength Code inspired from Ruin & Wesen's SysEx encoder/decoder - http://ruinwesen.com

Definition at line 83 of file MIDI.cpp.

{
    unsigned count  = 0;
    byte msbStorage = 0;
    byte byteIndex  = 0;

    for (unsigned i = 0; i < inLength; ++i)
    {
        if ((i % 8) == 0)
        {
            msbStorage = inSysEx[i];
            byteIndex  = 6;
        }
        else
        {
            const byte body = inSysEx[i];
            const byte msb  = ((msbStorage >> byteIndex--) & 1) << 7;
            outData[count++] = msb | body;
        }
    }
    return count;
}

encodeSysEx()

BEGIN_MIDI_NAMESPACE unsigned encodeSysEx	(	const byte *	inData,
		byte *	outSysEx,
		unsigned	inLength
	)

Encode System Exclusive messages. SysEx messages are encoded to guarantee transmission of data bytes higher than 127 without breaking the MIDI protocol. Use this static method to convert the data you want to send.

Parameters

inData	The data to encode.
outSysEx	The output buffer where to store the encoded message.
inLength	The lenght of the input buffer.

Returns

The lenght of the encoded output buffer.

See also

decodeSysEx Code inspired from Ruin & Wesen's SysEx encoder/decoder - http://ruinwesen.com

Definition at line 46 of file MIDI.cpp.

{
    unsigned outLength  = 0;     // Num bytes in output array.
    byte count          = 0;     // Num 7bytes in a block.
    outSysEx[0]         = 0;

    for (unsigned i = 0; i < inLength; ++i)
    {
        const byte data = inData[i];
        const byte msb  = data >> 7;
        const byte body = data & 0x7f;

        outSysEx[0] |= (msb << (6 - count));
        outSysEx[1 + count] = body;

        if (count++ == 6)
        {
            outSysEx   += 8;
            outLength  += 8;
            outSysEx[0] = 0;
            count       = 0;
        }
    }
    return outLength + count + (count != 0 ? 1 : 0);
}