//==============================================================================
void StepSequencer::runSeq(MidiBuffer & midiMessages, int bufferSize, double sampleRate)
{
// get GUI params
seqStepSpeed = 4.0f / params.seqStepSpeed.get(); // internally working with 1/4 = 1.0f
seqStepLength = jmin(4.0f / params.seqStepLength.get(), seqStepSpeed);
seqNumSteps = static_cast<int>(params.seqNumSteps.get());
if (params.seqDottedLength.getStep() == eOnOffToggle::eOn)
{
seqStepSpeed *= 1.5f;
seqStepLength *= 1.5f;
}
if (params.seqTriplets.getStep() == eOnOffToggle::eOn)
{
seqStepSpeed *= 2.0f / 3.0f;
seqStepLength *= 2.0f / 3.0f;
}
if (params.seqPlaySyncHost.getStep() == eOnOffToggle::eOn)
{
seqHostSync(midiMessages);
}
else if (params.seqPlayNoHost.getStep() == eOnOffToggle::eOn)
{
seqNoHostSync(midiMessages, bufferSize, sampleRate);
}
else
{
stopSeq(midiMessages);
}
}
/**
* Called while stepSequencer is synced with host.
*/
void StepSequencer::seqHostSync(MidiBuffer& midiMessages)
{
AudioPlayHead::CurrentPositionInfo hostPlayHead = params.positionInfo[params.getAudioIndex()];
double currPos = hostPlayHead.ppqPosition;
// if host ist playing
// NOTE: in Cubase 5 hostPlayHead.isPlaying even before actual playhead starts playing,
// at the beginning currPos can be negative
if (hostPlayHead.isPlaying && (currPos >= 0.0))
{
// if currPos passes stopNoteTime
if (currPos >= stopNoteTime)
{
if (seqNoteIsPlaying)
{
sendMidiNoteOffMessage(midiMessages, 0);
}
}
// if currPos passes seqNextStep or (currPos < lastPlayHeadPosition) implies loop or rewind
if ((currPos >= seqNextStep) || (currPos < lastPlayHeadPosition))
{
// stop note if could not stopped before playing seqNote (important for seqNoteLength == seqStepSpeed)
if (seqNoteIsPlaying)
{
sendMidiNoteOffMessage(midiMessages, 0);
}
// calculate note to play
currSeqNote = jmax(0, static_cast<int>(currPos / static_cast<double>(seqStepSpeed)) % seqNumSteps);
currSeqNote = jmin(currSeqNote, 7);
// if play upDown -> for all odd periods, play in reverse order (down sequence)
if (params.seqPlayMode.getStep() == eSeqPlayModes::eUpDown)
{
int upDownSeq = jmax(0, static_cast<int>(currPos / static_cast<double>(seqNumSteps) / static_cast<double>(seqStepSpeed)) % 2);
if (upDownSeq == 1)
{
currSeqNote = seqNumSteps - 1 - currSeqNote;
}
}
// if is not playing a note then prepare sending midi noteOn message
if (!seqNoteIsPlaying)
{
// set note to play as random
if (params.seqPlayMode.getStep() == eSeqPlayModes::eRandom)
{
setStepRandom(currSeqNote);
}
// if any note changed or is muted then send noteOff message to that note
midiNoteChanged(midiMessages);
// send midimessage into midibuffer
sendMidiNoteOnMessage(midiMessages, 0);
// calculate next stopNoteTime
stopNoteTime = currPos + seqStepLength;
}
}
// calculate next seqNextStep and save lastPlayHeadPosition
double offset = static_cast<double>(seqStepSpeed) - fmod(jmax(0.0, currPos), static_cast<double>(seqStepSpeed));
seqNextStep = jmax(0.0, currPos) + offset;
lastPlayHeadPosition = currPos;
seqStopped = false;
}
else
{
// if host is not playing then stop sequencer and reset variables
stopSeq(midiMessages);
}
}
void startStopSeq(bool gui)
{
clock::isRunning() ? stopSeq(gui) : startSeq(gui);
}