116 lines
4.2 KiB
C++
116 lines
4.2 KiB
C++
/*!
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* @file MIDI.cpp
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* Project Arduino MIDI Library
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* @brief MIDI Library for the Arduino
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* @author Francois Best
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* @date 24/02/11
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* @license MIT - Copyright (c) 2015 Francois Best
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* 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
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* all copies or 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
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* 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
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* THE SOFTWARE.
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*/
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#include "MIDI.h"
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// -----------------------------------------------------------------------------
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BEGIN_MIDI_NAMESPACE
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/*! \brief Encode System Exclusive messages.
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SysEx messages are encoded to guarantee transmission of data bytes higher than
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127 without breaking the MIDI protocol. Use this static method to convert the
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data you want to send.
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\param inData The data to encode.
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\param outSysEx The output buffer where to store the encoded message.
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\param inLength The lenght of the input buffer.
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\param inFlipHeaderBits True for Korg and other who store MSB in reverse order
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\return The lenght of the encoded output buffer.
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@see decodeSysEx
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Code inspired from Ruin & Wesen's SysEx encoder/decoder - http://ruinwesen.com
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*/
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unsigned encodeSysEx(const byte* inData,
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byte* outSysEx,
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unsigned inLength,
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bool inFlipHeaderBits)
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{
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unsigned outLength = 0; // Num bytes in output array.
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byte count = 0; // Num 7bytes in a block.
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outSysEx[0] = 0;
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for (unsigned i = 0; i < inLength; ++i)
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{
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const byte data = inData[i];
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const byte msb = data >> 7;
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const byte body = data & 0x7f;
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outSysEx[0] |= (msb << (inFlipHeaderBits ? count : (6 - count)));
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outSysEx[1 + count] = body;
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if (count++ == 6)
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{
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outSysEx += 8;
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outLength += 8;
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outSysEx[0] = 0;
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count = 0;
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}
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}
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return outLength + count + (count != 0 ? 1 : 0);
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}
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/*! \brief Decode System Exclusive messages.
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SysEx messages are encoded to guarantee transmission of data bytes higher than
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127 without breaking the MIDI protocol. Use this static method to reassemble
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your received message.
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\param inSysEx The SysEx data received from MIDI in.
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\param outData The output buffer where to store the decrypted message.
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\param inLength The lenght of the input buffer.
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\param inFlipHeaderBits True for Korg and other who store MSB in reverse order
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\return The lenght of the output buffer.
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@see encodeSysEx @see getSysExArrayLength
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Code inspired from Ruin & Wesen's SysEx encoder/decoder - http://ruinwesen.com
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*/
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unsigned decodeSysEx(const byte* inSysEx,
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byte* outData,
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unsigned inLength,
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bool inFlipHeaderBits)
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{
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unsigned count = 0;
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byte msbStorage = 0;
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byte byteIndex = 0;
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for (unsigned i = 0; i < inLength; ++i)
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{
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if ((i % 8) == 0)
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{
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msbStorage = inSysEx[i];
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byteIndex = 6;
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}
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else
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{
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const byte body = inSysEx[i];
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const byte shift = inFlipHeaderBits ? 6 - byteIndex : byteIndex;
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const byte msb = byte(((msbStorage >> shift) & 1) << 7);
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byteIndex--;
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outData[count++] = msb | body;
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}
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}
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return count;
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}
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END_MIDI_NAMESPACE
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