decodeSysEx()

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

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 length of the input buffer.
inFlipHeaderBits	True for Korg and other who store MSB in reverse order

Returns

The length of the output buffer.

See also

encodeSysEx

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

Definition at line 87 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 shift    = inFlipHeaderBits ? 6 - byteIndex : byteIndex;
            const byte msb      = byte(((msbStorage >> shift) & 1) << 7);
            byteIndex--;
            outData[count++] = msb | body;
        }
    }
    return count;
}