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MidiStateTracker micro-optimization 

This replaces 128 multiplications in each inner loop with
a single bit-shift.
This commit is contained in:
Robin Gareus 2023-06-30 16:38:46 +02:00
parent b51cf0ed95
commit 45b2791341
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 25 additions and 17 deletions
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42
libs/ardour/midi_state_tracker.cc
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@ -49,38 +49,42 @@ MidiNoteTracker::reset ()
void
MidiNoteTracker::add (uint8_t note, uint8_t chn)
{
if (_active_notes[note+128 * chn] == 0) {
const int coff = chn << 7;
if (_active_notes[note + coff] == 0) {
++_on;
}
++_active_notes[note + 128 * chn];
++_active_notes[note + coff];
if (_active_notes[note+128 * chn] > 1) {
//cerr << this << " note " << (int) note << '/' << (int) chn << " was already on, now at " << (int) _active_notes[note+128*chn] << endl;
#if 0
if (_active_notes[note + coff] > 1) {
cerr << this << " note " << (int) note << '/' << (int) chn << " was already on, now at " << (int) _active_notes[note + coff] << endl;
}
#endif
DEBUG_TRACE (PBD::DEBUG::MidiTrackers, string_compose ("%1 ON %2/%3 voices %5 total on %4\n",
this, (int) note, (int) chn, _on,
(int) _active_notes[note+128 * chn]));
(int) _active_notes[note + coff]));
}
void
MidiNoteTracker::remove (uint8_t note, uint8_t chn)
{
switch (_active_notes[note + 128 * chn]) {
const int coff = chn << 7;
switch (_active_notes[note + coff]) {
case 0:
break;
case 1:
--_on;
_active_notes [note + 128 * chn] = 0;
_active_notes [note + coff] = 0;
break;
default:
--_active_notes [note + 128 * chn];
--_active_notes [note + coff];
break;
}
DEBUG_TRACE (PBD::DEBUG::MidiTrackers, string_compose ("%1 OFF %2/%3 current voices = %5 total on %4\n",
this, (int) note, (int) chn, _on,
(int) _active_notes[note+128 * chn]));
(int) _active_notes[note + coff]));
}
void
@ -131,15 +135,16 @@ MidiNoteTracker::push_notes (MidiBuffer &dst, samplepos_t time, bool reset, int
}
for (int channel = 0; channel < 16; ++channel) {
const int coff = channel << 7;
for (int note = 0; note < 128; ++note) {
while (_active_notes[note + 128 * channel]) {
while (_active_notes[note + coff]) {
uint8_t buffer[3] = { ((uint8_t) (cmd | channel)), uint8_t (note), (uint8_t) velocity };
Evoral::Event<MidiBuffer::TimeType> ev (Evoral::MIDI_EVENT, time, 3, buffer, false);
/* note that we do not care about failure from
push_back() ... should we warn someone ?
*/
dst.push_back (ev);
_active_notes[note + 128 * channel]--;
_active_notes[note + coff]--;
DEBUG_TRACE (PBD::DEBUG::MidiTrackers, string_compose ("%1: MB-push note %2/%3 at %4\n", this, (int) note, (int) channel, time));
}
}
@ -161,8 +166,9 @@ MidiNoteTracker::resolve_notes (Evoral::EventSink<samplepos_t> &dst, samplepos_t
}
for (int channel = 0; channel < 16; ++channel) {
const int coff = channel << 7;
for (int note = 0; note < 128; ++note) {
while (_active_notes[note + 128 * channel]) {
while (_active_notes[note + coff]) {
buf[0] = MIDI_CMD_NOTE_OFF|channel;
buf[1] = note;
buf[2] = 0;
@ -170,7 +176,7 @@ MidiNoteTracker::resolve_notes (Evoral::EventSink<samplepos_t> &dst, samplepos_t
write() ... should we warn someone ?
*/
dst.write (time, Evoral::MIDI_EVENT, 3, buf);
_active_notes[note + 128 * channel]--;
_active_notes[note + coff]--;
DEBUG_TRACE (PBD::DEBUG::MidiTrackers, string_compose ("%1: EVS-resolved note %2/%3 at %4\n",
this, (int) note, (int) channel, time));
}
@ -192,8 +198,9 @@ MidiNoteTracker::resolve_notes (MidiSource& src, const MidiSource::WriterLock& l
/* NOTE: the src must be locked */
for (int channel = 0; channel < 16; ++channel) {
const int coff = channel << 7;
for (int note = 0; note < 128; ++note) {
while (_active_notes[note + 128 * channel]) {
while (_active_notes[note + coff]) {
Evoral::Event<Temporal::Beats> ev (Evoral::MIDI_EVENT, time, 3, 0, true);
ev.set_type (MIDI_CMD_NOTE_OFF);
ev.set_channel (channel);
@ -202,7 +209,7 @@ MidiNoteTracker::resolve_notes (MidiSource& src, const MidiSource::WriterLock& l
src.append_event_beats (lock, ev);
DEBUG_TRACE (PBD::DEBUG::MidiTrackers, string_compose ("%1: MS-resolved note %2/%3 at %4\n",
this, (int) note, (int) channel, time));
_active_notes[note + 128 * channel]--;
_active_notes[note + coff]--;
/* don't stack events up at the same time */
time += Temporal::Beats::one_tick();
}
@ -217,10 +224,11 @@ MidiNoteTracker::dump (ostream& o)
{
o << "****** NOTES\n";
for (int c = 0; c < 16; ++c) {
const int coff = c << 7;
for (int x = 0; x < 128; ++x) {
if (_active_notes[c * 128 + x]) {
if (_active_notes[coff + x]) {
o << "Channel " << c+1 << " Note " << x << " is on ("
<< (int) _active_notes[c*128+x] << " times)\n";
<< (int) _active_notes[coff+x] << " times)\n";
}
}
}