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libraries/FastLED/examples/LuminescentGrand/arduino/MIDI.cpp

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+/*!
+ *  @file       MIDI.cpp
+ *  Project     Arduino MIDI Library
+ *  @brief      MIDI Library for the Arduino
+ *  @author     Francois Best
+ *  @date       24/02/11
+ *  @license    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.
+ */
+
+#include "MIDI.h"
+
+// -----------------------------------------------------------------------------
+
+BEGIN_MIDI_NAMESPACE
+
+/*! \brief 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.
+ \param inData The data to encode.
+ \param outSysEx The output buffer where to store the encoded message.
+ \param inLength The length of the input buffer.
+ \param inFlipHeaderBits True for Korg and other who store MSB in reverse order
+ \return The length of the encoded output buffer.
+ @see decodeSysEx
+ Code inspired from Ruin & Wesen's SysEx encoder/decoder - http://ruinwesen.com
+ */
+unsigned encodeSysEx(const byte* inData,
+                     byte* outSysEx,
+                     unsigned inLength,
+                     bool inFlipHeaderBits)
+{
+    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 << (inFlipHeaderBits ? count : (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);
+}
+
+/*! \brief 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.
+ \param inSysEx The SysEx data received from MIDI in.
+ \param outData The output buffer where to store the decrypted message.
+ \param inLength The length of the input buffer.
+ \param inFlipHeaderBits True for Korg and other who store MSB in reverse order
+ \return The length of the output buffer.
+ @see encodeSysEx @see getSysExArrayLength
+ Code inspired from Ruin & Wesen's SysEx encoder/decoder - http://ruinwesen.com
+ */
+unsigned decodeSysEx(const byte* inSysEx,
+                     byte* outData,
+                     unsigned inLength,
+                     bool inFlipHeaderBits)
+{
+    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;
+}
+
+END_MIDI_NAMESPACE