Line data    Source code

       1             : #include "USBMIDI_Parser.hpp"
       2             : #include <Settings/SettingsWrapper.hpp>
       3             : 
       4             : BEGIN_CS_NAMESPACE
       5             : 
       6             : // http://www.usb.org/developers/docs/devclass_docs/midi10.pdf
       7          28 : MIDI_read_t USBMIDI_Parser::parse(uint8_t *packet) {
       8          28 :     DEBUG("MIDIUSB packet:\t" << hex << packet[0] << ' ' << packet[1] << ' '
       9             :                               << packet[2] << ' ' << packet[3] << dec);
      10          28 :     this->CN = (uint8_t)packet[0] >> 4;
      11          28 :     uint8_t CIN = (uint8_t)packet[0] << 4; // MIDI USB code index number
      12             : 
      13          28 :     if (CIN >= NOTE_OFF && CIN <= PITCH_BEND) {
      14             :         // 2- or 3-byte MIDI event
      15             : 
      16             :         // uint8_t type = packet[1] & 0xF0;
      17             :         // if (CIN != type) // invalid MIDI USB packet
      18             :         //    return NO_MESSAGE;
      19           4 :         midimsg.header = packet[1];
      20           4 :         midimsg.data1 = packet[2];
      21           4 :         midimsg.data2 = packet[3];
      22           4 :         midimsg.CN = this->CN;
      23           4 :         return CHANNEL_MESSAGE;
      24             :     }
      25             : 
      26             : #if !IGNORE_SYSEX
      27          24 :     else if (CIN == 0x40) {
      28             :         // SysEx starts or continues (3 bytes)
      29          10 :         if (packet[1] == SysExStart)
      30           6 :             startSysEx(CN); // start a new message
      31             :                             // (overwrite previous unfinished message)
      32           4 :         else if (!receivingSysEx(CN)) { // If we haven't received a SysExStart
      33           0 :             DEBUGREF(F("Error: No SysExStart received"));
      34           0 :             return NO_MESSAGE; // ignore the data
      35             :         }
      36          10 :         addSysExByte(CN, packet[1]) && // add three data bytes to buffer
      37          10 :             addSysExByte(CN, packet[2]) && addSysExByte(CN, packet[3]);
      38          10 :         return NO_MESSAGE; // SysEx is not finished yet
      39             :     }
      40             : 
      41          14 :     else if (CIN == 0x50) {
      42             :         // SysEx ends with following single byte
      43             :         // (or Single-byte System Common Message, not implemented)
      44           3 :         if (packet[1] != SysExEnd) { // System Common (not implemented)
      45           0 :             return NO_MESSAGE;
      46           3 :         } else if (!receivingSysEx(CN)) { // If we haven't received a SysExStart
      47           1 :             DEBUGFN(F("Error: No SysExStart received"));
      48           1 :             return NO_MESSAGE; // ignore the data
      49             :         }
      50           2 :         if (addSysExByte(CN, SysExEnd)) {
      51           2 :             endSysEx(CN);
      52           2 :             return SYSEX_MESSAGE;
      53             :         } else
      54           0 :             return NO_MESSAGE; // Buffer full, ignore message
      55             :     }
      56             : 
      57          11 :     else if (CIN == 0x60) {
      58             :         // SysEx ends with following two bytes
      59           4 :         if (packet[1] == SysExStart)
      60           1 :             startSysEx(CN); // start a new message
      61             :         // (overwrite previous unfinished message)
      62           3 :         else if (!receivingSysEx(CN)) { // If we haven't received a SysExStart
      63           1 :             DEBUGFN(F("Error: No SysExStart received"));
      64           1 :             return NO_MESSAGE; // ignore the data
      65             :         }
      66             :         if ( // add two data bytes to buffer
      67           3 :             addSysExByte(CN, packet[1]) && addSysExByte(CN, SysExEnd)) {
      68           3 :             endSysEx(CN);
      69           3 :             return SYSEX_MESSAGE;
      70             :         } else
      71           0 :             return NO_MESSAGE; // Buffer full, ignore message
      72             :     }
      73             : 
      74           7 :     else if (CIN == 0x70) {
      75             :         // SysEx ends with following three bytes
      76           5 :         if (packet[1] == SysExStart)
      77           1 :             startSysEx(CN); // start a new message
      78             :                             // (overwrite previous unfinished message)
      79           4 :         else if (!receivingSysEx(CN)) { // If we haven't received a SysExStart
      80           2 :             DEBUGFN(F("Error: No SysExStart received"));
      81           2 :             return NO_MESSAGE; // ignore the data
      82             :         }
      83             :         if ( // add three data bytes to buffer
      84           3 :             addSysExByte(CN, packet[1]) && addSysExByte(CN, packet[2]) &&
      85           3 :             addSysExByte(CN, SysExEnd)) {
      86           3 :             endSysEx(CN);
      87           3 :             return SYSEX_MESSAGE;
      88             :         } else
      89           0 :             return NO_MESSAGE; // Buffer full, ignore message
      90             :     }
      91             : #endif // IGNORE_SYSEX
      92             : 
      93             :     /*
      94             :     else if (CIN == 0x00) // Miscellaneous function codes. Reserved for future extensions. (not implemented)
      95             :       ;
      96             :     else if (CIN == 0x10) // Cable events. Reserved for future expansion. (not implemented)
      97             :       ;
      98             :     else if (CIN == 0x20) // Two-byte System Common message (not implemented)
      99             :       ;
     100             :     else if (CIN == 0x30) // Three-byte System Common message (not implemented)
     101             :       ;
     102             :   */
     103           2 :     else if (CIN == 0xF0) // Single Byte
     104           2 :         return static_cast<MIDI_read_t>(packet[1]);
     105             : 
     106           0 :     return NO_MESSAGE;
     107          28 : }
     108             : 
     109             : END_CS_NAMESPACE