diff options
Diffstat (limited to 'backends')
| -rw-r--r-- | backends/midi/coremidi.cpp | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/backends/midi/coremidi.cpp b/backends/midi/coremidi.cpp index f60b84cc5d..19378b7ca2 100644 --- a/backends/midi/coremidi.cpp +++ b/backends/midi/coremidi.cpp @@ -108,23 +108,44 @@ void MidiDriver_CoreMIDI::send(uint32 b) { assert(mOutPort != NULL); assert(mDest != NULL); + // Extract the MIDI data byte status_byte = (b & 0x000000FF); byte first_byte = (b & 0x0000FF00) >> 8; byte second_byte = (b & 0x00FF0000) >> 16; + // Generate a single MIDI packet with that data MIDIPacketList packetList; MIDIPacket *packet = &packetList.packet[0]; packetList.numPackets = 1; packet->timeStamp = 0; - packet->length = 3; packet->data[0] = status_byte; packet->data[1] = first_byte; packet->data[2] = second_byte; - MIDISend(mOutPort, mDest, &packetList); + // Compute the correct length of the MIDI command. This is important, + // else things may screw up badly... + switch (status_byte & 0xF0) { + case 0x80: // Note Off + case 0x90: // Note On + case 0xA0: // Polyphonic Aftertouch + case 0xB0: // Controller Change + case 0xE0: // Pitch Bending + packet->length = 3; + break; + case 0xC0: // Programm Change + case 0xD0: // Monophonic Aftertouch + packet->length = 2; + break; + default: + warning("CoreMIDI driver encountered unsupported status byte: 0x%02x", status_byte); + packet->length = 3; + break; + } + // Finally send it out to the synthesizer. + MIDISend(mOutPort, mDest, &packetList); } void MidiDriver_CoreMIDI::sysEx(byte *msg, uint16 length) { |