void MIDIOutputCallbackHelper::AddMIDIEvent(UInt8 status,
UInt8 channel,
UInt8 data1,
UInt8 data2,
UInt32 inStartFrame)
{
MIDIMessageInfoStruct info = {status, channel, data1, data2, inStartFrame};
mMIDIMessageList.push_back(info);
}
void MIDIOutputCallbackHelper::FireAtTimeStamp(const AudioTimeStamp &inTimeStamp)
{
if (!mMIDIMessageList.empty())
{
if (mMIDICallbackStruct.midiOutputCallback)
{
// synthesize the packet list and call the MIDIOutputCallback
// iterate through the vector and get each item
MIDIPacketList *pktlist = PacketList();
MIDIPacket *pkt = MIDIPacketListInit(pktlist);
for (MIDIMessageList::iterator iter = mMIDIMessageList.begin(); iter != mMIDIMessageList.end(); iter++)
{
const MIDIMessageInfoStruct & item = *iter;
Byte midiStatusByte = item.status + item.channel;
const Byte data[3] = { midiStatusByte, item.data1, item.data2 };
UInt32 midiDataCount = ((item.status == 0xC || item.status == 0xD) ? 2 : 3);
pkt = MIDIPacketListAdd (pktlist,
kSizeofMIDIBuffer,
pkt,
item.startFrame,
midiDataCount,
data);
if (!pkt)
{
// send what we have and then clear the buffer and then go through this again
// issue the callback with what we got
OSStatus result = (*mMIDICallbackStruct.midiOutputCallback) (mMIDICallbackStruct.userData, &inTimeStamp, 0, pktlist);
if (result != noErr)
printf("error calling output callback: %d", (int) result);
// clear stuff we've already processed, and fire again
mMIDIMessageList.erase (mMIDIMessageList.begin(), iter);
FireAtTimeStamp(inTimeStamp);
return;
}
}
// fire callback
OSStatus result = (*mMIDICallbackStruct.midiOutputCallback) (mMIDICallbackStruct.userData, &inTimeStamp, 0, pktlist);
if (result != noErr)
printf("error calling output callback: %d", (int) result);
}
mMIDIMessageList.clear();
}
}
void MIDIOutputCallbackHelper::FireAtTimeStamp(const AudioTimeStamp &inTimeStamp) {
if (!mMIDIMessageList.empty() && mMIDICallbackStruct.midiOutputCallback != 0) {
// synthesize the packet list and call the MIDIOutputCallback
// iterate through the vector and get each item
std::vector<MIDIMessageInfoStruct>::iterator myIterator;
MIDIPacketList *pktlist = PacketList();
for (myIterator = mMIDIMessageList.begin(); myIterator != mMIDIMessageList.end(); myIterator++) {
MIDIMessageInfoStruct item = *myIterator;
MIDIPacket *pkt = MIDIPacketListInit(pktlist);
bool tooBig = false;
Byte midiStatusByte = (item.status << 4) | item.channel;
Byte data[3] = { midiStatusByte, item.data1, item.data2 };
if ((pkt = MIDIPacketListAdd(pktlist, sizeof(mBuffersAllocated), pkt, item.startFrame, 4, const_cast<Byte*>(data))) == NULL)
tooBig = true;
if (tooBig) { // send what we have and then clear the buffer and send again
// issue the callback with what we got
OSStatus result = mMIDICallbackStruct.midiOutputCallback(mMIDICallbackStruct.userData, &inTimeStamp, 0, pktlist);
if (result != noErr)
printf("error calling output callback: %d", (int) result);
// clear stuff we've already processed, and fire again
mMIDIMessageList.erase(mMIDIMessageList.begin(), myIterator);
this->FireAtTimeStamp(inTimeStamp);
return;
}
}
// fire callback
OSStatus result = mMIDICallbackStruct.midiOutputCallback(mMIDICallbackStruct.userData, &inTimeStamp, 0, pktlist);
if (result != noErr)
printf("error calling output callback: %d", (int) result);
mMIDIMessageList.clear();
}
}