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Fix MIDI timestamp calculations when you loop AND have time track...

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... At least it fixes the gross problem; but there seems to be a small
accumulation of error still each time around the loop, that I don't understand
yet.
This commit is contained in:
Paul Licameli
2017-08-24 19:44:35 -04:00
parent 85b2f80545
commit 4a0a7efd84
2 changed files with 45 additions and 23 deletions
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48
src/AudioIO.cpp
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@@ -214,7 +214,8 @@
special "event" of sending all notes off. After that, we destroy
the iterator and use PrepareMidiIterator() to set up a NEW one.
At each iteration, time must advance by (mT1 - mT0), so the
accumulated time is held in mMidiLoopOffset.
accumulated complete loop time (in "unwarped," track time) is computed
by MidiLoopOffset().
\todo run through all functions called from audio and portaudio threads
to verify they are thread-safe. Note that synchronization of the style:
@@ -2144,7 +2145,7 @@ bool AudioIO::StartPortMidiStream()
if (mLastPmError == pmNoError) {
mMidiStreamActive = true;
mMidiPaused = false;
mMidiLoopOffset = 0;
mMidiLoopPasses = 0;
mMidiOutputComplete = false;
PrepareMidiIterator();
@@ -3804,6 +3805,19 @@ void AudioIO::SetListener(AudioIOListener* listener)
static Alg_update gAllNotesOff; // special event for loop ending
// the fields of this event are never used, only the address is important
double AudioIO::UncorrectedMidiEventTime()
{
double time;
if (mTimeTrack)
time =
mTimeTrack->ComputeWarpedLength(mT0, mNextEventTime - MidiLoopOffset())
+ mT0 + (mMidiLoopPasses * mWarpedLength);
else
time = mNextEventTime;
return time + PauseTime();
}
void AudioIO::OutputEvent()
{
int channel = (mNextEvent->chan) & 0xF; // must be in [0..15]
@@ -3811,13 +3825,10 @@ void AudioIO::OutputEvent()
int data1 = -1;
int data2 = -1;
double eventTime;
if (mTimeTrack)
eventTime = mTimeTrack->ComputeWarpedLength(mT0, mNextEventTime) + mT0;
else
eventTime = mNextEventTime;
double eventTime = UncorrectedMidiEventTime();
// 0.0005 is for rounding
double time = eventTime + PauseTime() + 0.0005 -
double time = eventTime + 0.0005 -
((mMidiLatency + mSynthLatency) * 0.001);
time += 1; // MidiTime() has a 1s offset
@@ -3833,8 +3844,8 @@ void AudioIO::OutputEvent()
AllNotesOff();
if (mPlayMode == gAudioIO->PLAY_LOOPED) {
// jump back to beginning of loop
mMidiLoopOffset += (mT1 - mT0);
PrepareMidiIterator(false, mMidiLoopOffset);
++mMidiLoopPasses;
PrepareMidiIterator(false, MidiLoopOffset());
} else {
mNextEvent = NULL;
}
@@ -3958,18 +3969,19 @@ void AudioIO::GetNextEvent()
mNextEvent = NULL;
return;
}
auto midiLoopOffset = MidiLoopOffset();
mNextEvent = mIterator->next(&mNextIsNoteOn,
(void **) &mNextEventTrack,
&nextOffset, mT1 + mMidiLoopOffset);
&nextOffset, mT1 + midiLoopOffset);
mNextEventTime = mT1 + mMidiLoopOffset + 1;
mNextEventTime = mT1 + midiLoopOffset + 1;
if (mNextEvent) {
mNextEventTime = (mNextIsNoteOn ? mNextEvent->time :
mNextEvent->get_end_time()) + nextOffset;;
}
if (mNextEventTime > (mT1 + mMidiLoopOffset)){ // terminate playback at mT1
if (mNextEventTime > (mT1 + midiLoopOffset)){ // terminate playback at mT1
mNextEvent = &gAllNotesOff;
mNextEventTime = mT1 + mMidiLoopOffset - ALG_EPS;
mNextEventTime = mT1 + midiLoopOffset - ALG_EPS;
mNextIsNoteOn = true; // do not look at duration
mIterator->end();
mIterator.reset(); // debugging aid
@@ -4000,12 +4012,10 @@ void AudioIO::FillMidiBuffers()
break;
}
SetHasSolo(hasSolo);
// Compute the current track time differently depending upon
// whether audio playback is in effect:
double time = AudioTime() - PauseTime();
double time = AudioTime();
while (mNextEvent &&
(mTimeTrack ? (mTimeTrack->ComputeWarpedLength(mT0, mNextEventTime) + mT0) : mNextEventTime)
< time + ((MIDI_SLEEP + mSynthLatency) * 0.001)) {
UncorrectedMidiEventTime() <
time + ((MIDI_SLEEP + mSynthLatency) * 0.001)) {
OutputEvent();
GetNextEvent();
}