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continue with tweaks to VST timeinfo, such that the again demo plugin appears to work exactly as expected

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This commit is contained in:
Paul Davis 2014-01-15 22:28:01 -05:00
parent 1c01ac5bc8
commit 0b9199163d
1 changed files with 72 additions and 22 deletions
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94
libs/ardour/session_vst.cc
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@ -131,66 +131,116 @@ intptr_t Session::vst_callback (
// (see valid masks above), as some items may require extensive
// conversions
_timeInfo.flags = 0;
std::cerr << "VST get time callback, value = " << std::hex << value << std::dec << std::endl;
if (session) {
framepos_t now = session->transport_frame();
std::cerr << "\t@ " << now << std::endl;
_timeInfo.samplePos = now;
_timeInfo.sampleRate = session->frame_rate();
const TempoMetric& tm (session->tempo_map().metric_at (now));
if (value & (kVstTempoValid)) {
const Tempo& t (tm.tempo());
_timeInfo.tempo = t.beats_per_minute ();
_timeInfo.flags |= (kVstTempoValid);
std::cerr << "\ttempo makes " << std::hex << _timeInfo.flags << std::dec << std::endl;
}
if (value & (kVstTimeSigValid)) {
const Meter& m (tm.meter());
_timeInfo.timeSigNumerator = m.divisions_per_bar ();
_timeInfo.timeSigDenominator = m.note_divisor ();
_timeInfo.flags |= (kVstTimeSigValid);
std::cerr << "\ttimedig makes " << std::hex << _timeInfo.flags << std::dec << std::endl;
}
if (value & (kVstPpqPosValid)) {
if ((value & (kVstPpqPosValid)) || (value & (kVstBarsValid))) {
Timecode::BBT_Time bbt;
try {
session->tempo_map().bbt_time_rt (now, bbt);
/* Note that this assumes constant
meter/tempo throughout the session. We
can do better than this, because
progressive rock fans demand it.
/* PPQ = pulse per quarter
VST's "pulse" is our "division".
8 divisions per bar, 1 division = quarter, so 8 quarters per bar, ppq = 1
8 divisions per bar, 1 division = eighth, so 4 quarters per bar, ppq = 2
4 divisions per bar, 1 division = quarter, so 4 quarters per bar, ppq = 1
4 divisions per bar, 1 division = half, so 8 quarters per bar, ppq = 0.5
4 divisions per bar, 1 division = fifth, so (4 * 5/4) quarters per bar, ppq = 5/4
general: divs_per_bar / (note_type / 4.0)
*/
double ppq_scaling = tm.meter().note_divisor() / 4.0;
/* Note that this assumes constant meter/tempo throughout the session. Stupid VST
*/
double ppqBar = double(bbt.bars - 1) * tm.meter().divisions_per_bar();
double ppqBeat = double(bbt.beats - 1);
double ppqTick = double(bbt.ticks) / Timecode::BBT_Time::ticks_per_beat;
// PPQ Pos
_timeInfo.ppqPos = ppqBar + ppqBeat + ppqTick;
_timeInfo.flags |= (kVstPpqPosValid);
std::cerr << "\tppq makes " << std::hex << _timeInfo.flags << std::dec << std::endl;
ppqBar *= ppq_scaling;
ppqBeat *= ppq_scaling;
ppqTick *= ppq_scaling;
if (value & (kVstPpqPosValid)) {
_timeInfo.ppqPos = ppqBar + ppqBeat + ppqTick;
_timeInfo.flags |= (kVstPpqPosValid);
}
if (value & (kVstBarsValid)) {
_timeInfo.barStartPos = ppqBar;
_timeInfo.flags |= (kVstPpqPosValid);
}
} catch (...) {
/* relax */
}
}
// Bars
// _timeInfo.barStartPos = ppqBar;
// _timeInfo.flags |= kVstBarsValid;
if (value & (kVstSmpteValid)) {
Timecode::Time t;
session->timecode_time (now, t);
_timeInfo.smpteOffset = (t.hours * t.rate * 60.0 * 60.0) +
(t.minutes * t.rate * 60.0) +
(t.seconds * t.rate) +
(t.frames) +
(t.subframes);
_timeInfo.smpteOffset *= 80.0; /* VST spec is 1/80th frames */
if (session->timecode_drop_frames()) {
if (session->timecode_frames_per_second() == 30.0) {
_timeInfo.smpteFrameRate = 5;
} else {
_timeInfo.smpteFrameRate = 4; /* 29.97 assumed, thanks VST */
}
} else {
if (session->timecode_frames_per_second() == 24.0) {
_timeInfo.smpteFrameRate = 0;
} else if (session->timecode_frames_per_second() == 24.975) {
_timeInfo.smpteFrameRate = 2;
} else if (session->timecode_frames_per_second() == 25.0) {
_timeInfo.smpteFrameRate = 1;
} else {
_timeInfo.smpteFrameRate = 3; /* 30 fps */
}
}
_timeInfo.flags |= (kVstSmpteValid);
}
if (session->transport_speed() != 0.0f) {
_timeInfo.flags |= kVstTransportPlaying;
_timeInfo.flags |= (kVstTransportPlaying);
}
if (session->get_play_loop()) {
}
} else {
_timeInfo.samplePos = 0;
_timeInfo.sampleRate = AudioEngine::instance()->sample_rate();
}
std::cerr << "\ttimeinfo valid = " << std::hex << _timeInfo.flags << std::dec << std::endl;
return (long)&_timeInfo;
return (intptr_t) &_timeInfo;
case audioMasterProcessEvents:
SHOW_CALLBACK ("amc: audioMasterProcessEvents\n");