static void findTimeSigEvents (MidiFile& midiFile, StringPairArray& midiMetadata) { MidiMessageSequence timeSigEvents; midiFile.findAllTimeSigEvents (timeSigEvents); const int numTimeSigEvents = timeSigEvents.getNumEvents(); MemoryOutputStream timeSigSequence; for (int i = 0; i < numTimeSigEvents; ++i) { int numerator, denominator; timeSigEvents.getEventPointer(i)->message.getTimeSignatureInfo (numerator, denominator); String timeSigString; timeSigString << numerator << '/' << denominator; if (i == 0) midiMetadata.set (CoreAudioFormat::timeSig, timeSigString); if (numTimeSigEvents > 1) timeSigSequence << timeSigString << ',' << timeSigEvents.getEventTime (i) << ';'; } if (timeSigSequence.getDataSize() > 0) midiMetadata.set ("time signature sequence", timeSigSequence.toUTF8()); }
static void findKeySigEvents (MidiFile& midiFile, StringPairArray& midiMetadata) { MidiMessageSequence keySigEvents; midiFile.findAllKeySigEvents (keySigEvents); const int numKeySigEvents = keySigEvents.getNumEvents(); MemoryOutputStream keySigSequence; for (int i = 0; i < numKeySigEvents; ++i) { const MidiMessage& message (keySigEvents.getEventPointer (i)->message); const int key = jlimit (0, 14, message.getKeySignatureNumberOfSharpsOrFlats() + 7); const bool isMajor = message.isKeySignatureMajorKey(); static const char* majorKeys[] = { "Cb", "Gb", "Db", "Ab", "Eb", "Bb", "F", "C", "G", "D", "A", "E", "B", "F#", "C#" }; static const char* minorKeys[] = { "Ab", "Eb", "Bb", "F", "C", "G", "D", "A", "E", "B", "F#", "C#", "G#", "D#", "A#" }; String keySigString (isMajor ? majorKeys[key] : minorKeys[key]); if (! isMajor) keySigString << 'm'; if (i == 0) midiMetadata.set (CoreAudioFormat::keySig, keySigString); if (numKeySigEvents > 1) keySigSequence << keySigString << ',' << keySigEvents.getEventTime (i) << ';'; } if (keySigSequence.getDataSize() > 0) midiMetadata.set ("key signature sequence", keySigSequence.toUTF8()); }
static void findTempoEvents (MidiFile& midiFile, StringPairArray& midiMetadata) { MidiMessageSequence tempoEvents; midiFile.findAllTempoEvents (tempoEvents); const int numTempoEvents = tempoEvents.getNumEvents(); MemoryOutputStream tempoSequence; for (int i = 0; i < numTempoEvents; ++i) { const double tempo = getTempoFromTempoMetaEvent (tempoEvents.getEventPointer (i)); if (tempo > 0.0) { if (i == 0) midiMetadata.set (CoreAudioFormat::tempo, String (tempo)); if (numTempoEvents > 1) tempoSequence << String (tempo) << ',' << tempoEvents.getEventTime (i) << ';'; } } if (tempoSequence.getDataSize() > 0) midiMetadata.set ("tempo sequence", tempoSequence.toUTF8()); }
//============================================================================== void MidiSequencePlugin::processBlock (AudioSampleBuffer& buffer, MidiBuffer& midiMessages) { MidiSequencePluginBase::processBlock(buffer, midiMessages); MidiMessageSequence sourceMidi = *midiSequence; std::vector<int> doneTheseControllers; if (transport->isPlaying () && getBoolValue(PROP_SEQENABLED, true)) { const int blockSize = buffer.getNumSamples (); MidiBuffer* midiBuffer = midiBuffers.getUnchecked (0); const int frameCounter = transport->getPositionInFrames (); const int framesPerBeat = transport->getFramesPerBeat (); const int nextBlockFrameNumber = frameCounter + blockSize; const int seqIndex = getLoopRepeatIndex(); const double beatCount = getLoopBeatPosition(); const double frameLenBeatCount = (nextBlockFrameNumber - frameCounter) / (double)framesPerBeat; double frameEndBeatCount = beatCount + frameLenBeatCount; if (frameEndBeatCount > getLengthInBeats()) frameEndBeatCount -= getLengthInBeats(); // loop for each controller we need to interpolate MidiMessage* lastCtrlEvent = NULL; do { lastCtrlEvent = NULL; // hunt for a controller event before now int i; for (i = 0; i < sourceMidi.getNumEvents (); i++) { int timeStampInSeq = roundFloatToInt (sourceMidi.getEventTime (i) * framesPerBeat); int timeStamp = timeStampInSeq + (seqIndex * getLengthInBeats() * framesPerBeat); MidiMessage* midiMessage = &sourceMidi.getEventPointer (i)->message; if (timeStamp >= nextBlockFrameNumber || !midiMessage) break; // event is after now, leave //if (midiMessage->isController() && (std::find(doneTheseControllers.begin(), doneTheseControllers.end(), midiMessage->getControllerNumber()) == doneTheseControllers.end())) // lastCtrlEvent = midiMessage; } // hunt for a matching event after that one if (lastCtrlEvent) { // store the controller number so we know which controllers we've done doneTheseControllers.push_back(lastCtrlEvent->getControllerNumber()); MidiMessage* nextCtrlEvent = NULL; for (; i < sourceMidi.getNumEvents (); i++) { MidiMessage* midiMessage = &sourceMidi.getEventPointer (i)->message; if (midiMessage->isController() && midiMessage->getControllerNumber() == lastCtrlEvent->getControllerNumber()) { nextCtrlEvent = midiMessage; break; } } // render an interpolated event!... if (nextCtrlEvent) { double bt = nextCtrlEvent->getTimeStamp(); double at = lastCtrlEvent->getTimeStamp(); double deltaBeats = bt - at; int a = lastCtrlEvent->getControllerValue(); int b = nextCtrlEvent->getControllerValue(); double now = beatCount + (frameEndBeatCount - beatCount) / 2.0; double interpRemainBeats = deltaBeats - (now - at); if (deltaBeats > 0) { double nextPart = interpRemainBeats / deltaBeats; nextPart = 1 - nextPart; double interpdVal = a + nextPart * (b - a); MidiMessage interpy = MidiMessage::controllerEvent(lastCtrlEvent->getChannel(), lastCtrlEvent->getControllerNumber(), static_cast<int>(interpdVal)); midiBuffer->addEvent (interpy, (nextBlockFrameNumber - frameCounter) / 2); } else { DBG ("Negative delta beats when rendering automation!!"); } } } // now we also need to do that again if there are multiple events per frame AND we are interpolating multiple times per frame // (at the moment only interpolating once per audio frame) } while (lastCtrlEvent != NULL); } }