159 lines
5.3 KiB
C++
159 lines
5.3 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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MidiMessageCollector::MidiMessageCollector()
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{
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}
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MidiMessageCollector::~MidiMessageCollector()
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{
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}
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//==============================================================================
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void MidiMessageCollector::reset (const double newSampleRate)
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{
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jassert (newSampleRate > 0);
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const ScopedLock sl (midiCallbackLock);
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#if JUCE_DEBUG
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hasCalledReset = true;
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#endif
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sampleRate = newSampleRate;
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incomingMessages.clear();
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lastCallbackTime = Time::getMillisecondCounterHiRes();
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}
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void MidiMessageCollector::addMessageToQueue (const MidiMessage& message)
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{
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#if JUCE_DEBUG
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jassert (hasCalledReset); // you need to call reset() to set the correct sample rate before using this object
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#endif
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// the messages that come in here need to be time-stamped correctly - see MidiInput
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// for details of what the number should be.
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jassert (message.getTimeStamp() != 0);
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const ScopedLock sl (midiCallbackLock);
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auto sampleNumber = (int) ((message.getTimeStamp() - 0.001 * lastCallbackTime) * sampleRate);
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incomingMessages.addEvent (message, sampleNumber);
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// if the messages don't get used for over a second, we'd better
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// get rid of any old ones to avoid the queue getting too big
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if (sampleNumber > sampleRate)
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incomingMessages.clear (0, sampleNumber - (int) sampleRate);
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}
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void MidiMessageCollector::removeNextBlockOfMessages (MidiBuffer& destBuffer,
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const int numSamples)
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{
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#if JUCE_DEBUG
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jassert (hasCalledReset); // you need to call reset() to set the correct sample rate before using this object
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#endif
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jassert (numSamples > 0);
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auto timeNow = Time::getMillisecondCounterHiRes();
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auto msElapsed = timeNow - lastCallbackTime;
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const ScopedLock sl (midiCallbackLock);
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lastCallbackTime = timeNow;
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if (! incomingMessages.isEmpty())
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{
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int numSourceSamples = jmax (1, roundToInt (msElapsed * 0.001 * sampleRate));
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int startSample = 0;
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int scale = 1 << 16;
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const uint8* midiData;
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int numBytes, samplePosition;
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MidiBuffer::Iterator iter (incomingMessages);
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if (numSourceSamples > numSamples)
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{
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// if our list of events is longer than the buffer we're being
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// asked for, scale them down to squeeze them all in..
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const int maxBlockLengthToUse = numSamples << 5;
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if (numSourceSamples > maxBlockLengthToUse)
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{
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startSample = numSourceSamples - maxBlockLengthToUse;
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numSourceSamples = maxBlockLengthToUse;
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iter.setNextSamplePosition (startSample);
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}
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scale = (numSamples << 10) / numSourceSamples;
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while (iter.getNextEvent (midiData, numBytes, samplePosition))
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{
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samplePosition = ((samplePosition - startSample) * scale) >> 10;
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destBuffer.addEvent (midiData, numBytes,
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jlimit (0, numSamples - 1, samplePosition));
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}
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}
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else
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{
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// if our event list is shorter than the number we need, put them
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// towards the end of the buffer
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startSample = numSamples - numSourceSamples;
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while (iter.getNextEvent (midiData, numBytes, samplePosition))
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{
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destBuffer.addEvent (midiData, numBytes,
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jlimit (0, numSamples - 1, samplePosition + startSample));
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}
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}
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incomingMessages.clear();
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}
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}
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//==============================================================================
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void MidiMessageCollector::handleNoteOn (MidiKeyboardState*, int midiChannel, int midiNoteNumber, float velocity)
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{
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MidiMessage m (MidiMessage::noteOn (midiChannel, midiNoteNumber, velocity));
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m.setTimeStamp (Time::getMillisecondCounterHiRes() * 0.001);
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addMessageToQueue (m);
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}
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void MidiMessageCollector::handleNoteOff (MidiKeyboardState*, int midiChannel, int midiNoteNumber, float velocity)
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{
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MidiMessage m (MidiMessage::noteOff (midiChannel, midiNoteNumber, velocity));
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m.setTimeStamp (Time::getMillisecondCounterHiRes() * 0.001);
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addMessageToQueue (m);
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}
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void MidiMessageCollector::handleIncomingMidiMessage (MidiInput*, const MidiMessage& message)
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{
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addMessageToQueue (message);
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}
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} // namespace juce
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