INT32 MIDI_Utils_StartDevice(MacMidiDeviceHandle* handle) {
OSStatus err = noErr;
if (!handle || !handle->h.deviceHandle) {
ERROR0("ERROR: MIDI_Utils_StartDevice: handle or native is NULL\n");
return MIDI_INVALID_HANDLE;
}
// Clears all the events from the queue.
MIDI_QueueClear(handle->h.queue);
if (!handle->isStarted) {
/* set the flag that we can now receive messages */
handle->isStarted = TRUE;
if (handle->direction == MIDI_IN) {
// The handle->h.platformData field contains the (pthread_cond_t*)
// associated with the source of the MIDI input stream, and is
// used in the CoreMIDI's callback to signal the arrival of new
// data.
//
// Similarly, handle->h.queue is used in the CoreMDID's callback
// to dispatch the incoming messages to the appropriate queue.
//
err = MIDIPortConnectSource(inPort, (MIDIEndpointRef) (intptr_t) (handle->h.deviceHandle), (void*) handle);
} else if (handle->direction == MIDI_OUT) {
// Unschedules previous-sent packets.
err = MIDIFlushOutput((MIDIEndpointRef) (intptr_t) handle->h.deviceHandle);
}
MIDI_CHECK_ERROR;
}
return MIDI_SUCCESS; /* don't fail */
}
INT32 MIDI_Utils_StopDevice(MacMidiDeviceHandle* handle) {
OSStatus err = noErr;
if (!handle || !handle->h.deviceHandle) {
ERROR0("ERROR: MIDI_Utils_StopDevice: handle or native handle is NULL\n");
return MIDI_INVALID_HANDLE;
}
if (handle->isStarted) {
/* set the flag that we don't want to receive messages anymore */
handle->isStarted = FALSE;
if (handle->direction == MIDI_IN) {
err = MIDIPortDisconnectSource(inPort, (MIDIEndpointRef) (intptr_t) (handle->h.deviceHandle));
} else if (handle->direction == MIDI_OUT) {
// Unschedules previously-sent packets.
err = MIDIFlushOutput((MIDIEndpointRef) (intptr_t) handle->h.deviceHandle);
}
MIDI_CHECK_ERROR;
}
return MIDI_SUCCESS;
}
JNIEXPORT jint JNICALL Java_com_apple_audio_midi_MIDIEndpoint_MIDIFlushOutput
(JNIEnv *, jclass, jint dest)
{
return (jint)MIDIFlushOutput((MIDIEndpointRef)dest);
}