mirror of
https://github.com/juce-framework/JUCE.git
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297 lines
11 KiB
C++
297 lines
11 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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enum class SysexExtractorCallbackKind
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{
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notSysex,
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ongoingSysex,
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lastSysex,
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};
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class BytestreamSysexExtractor
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{
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public:
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void reset()
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{
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state = RunningStatus{};
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}
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template <typename Callback>
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void push (Span<const std::byte> bytes, Callback&& callback)
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{
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for (const auto pair : enumerate (bytes))
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{
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const auto index = pair.index;
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const auto byte = pair.value;
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state = std::invoke ([&]() -> State
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{
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if (auto* inSysex = std::get_if<InSysex> (&state))
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{
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if (byte == std::byte { 0xf0 })
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{
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callback (SysexExtractorCallbackKind::lastSysex,
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Span { bytes.data() + index - inSysex->numBytes, inSysex->numBytes });
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return InSysex { 1 };
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}
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if (byte == std::byte { 0xf7 })
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{
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callback (SysexExtractorCallbackKind::lastSysex,
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Span { bytes.data() + index - inSysex->numBytes, inSysex->numBytes + 1 });
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return RunningStatus{};
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}
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if (isRealtimeMessage (byte))
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{
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callback (SysexExtractorCallbackKind::ongoingSysex,
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Span { bytes.data() + index - inSysex->numBytes, inSysex->numBytes });
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callback (SysexExtractorCallbackKind::notSysex,
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Span { bytes.data() + index, 1 });
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return InSysex{};
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}
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if (isStatusByte (byte))
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{
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callback (SysexExtractorCallbackKind::lastSysex,
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Span { bytes.data() + index - inSysex->numBytes, inSysex->numBytes });
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return RunningStatus { 1, { byte } };
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}
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return InSysex { inSysex->numBytes + 1 };
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}
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if (auto* runningStatus = std::get_if<RunningStatus> (&state))
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{
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if (byte == std::byte { 0xf0 })
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return InSysex { 1 };
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const auto nextRunningStatus = std::invoke ([&]
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{
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if (isRealtimeMessage (byte))
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{
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callback (SysexExtractorCallbackKind::notSysex,
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Span { bytes.data() + index, 1 });
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return *runningStatus;
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}
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if (isInitialByte (byte))
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return RunningStatus{}.withAppendedByte (byte);
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if (0 < runningStatus->size && runningStatus->size < runningStatus->data.size())
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return runningStatus->withAppendedByte (byte);
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// If we get to this branch, we're trying to process a non-status byte
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// without having seen any previous status byte, so ignore the current byte
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return RunningStatus{};
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});
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if (const auto completeMessage = nextRunningStatus.getCompleteMessage(); ! completeMessage.empty())
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{
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callback (SysexExtractorCallbackKind::notSysex,
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completeMessage);
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return RunningStatus{}.withAppendedByte (nextRunningStatus.data[0]);
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}
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return nextRunningStatus;
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}
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// Can only happen if the variant is valueless by exception, which indicates a much
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// more severe problem!
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std::terminate();
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});
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}
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if (auto* inSysex = std::get_if<InSysex> (&state))
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{
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callback (SysexExtractorCallbackKind::ongoingSysex,
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Span { bytes.data() + bytes.size() - inSysex->numBytes, inSysex->numBytes });
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state = InSysex{};
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}
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}
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private:
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static bool isRealtimeMessage (std::byte byte) { return std::byte (0xf8) <= byte && byte <= std::byte (0xfe); }
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static bool isStatusByte (std::byte byte) { return std::byte (0x80) <= byte; }
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static bool isInitialByte (std::byte byte) { return isStatusByte (byte) && byte != std::byte (0xf7); }
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struct InSysex
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{
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size_t numBytes{};
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};
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struct RunningStatus
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{
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// These constructors are required to work around a bug in GCC 7
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RunningStatus() {}
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RunningStatus (uint8_t sizeIn, std::array<std::byte, 3> dataIn)
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: size (sizeIn), data (dataIn) {}
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uint8_t size{};
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std::array<std::byte, 3> data{};
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Span<const std::byte> getCompleteMessage() const
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{
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if (size == 0)
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return {};
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const auto expectedSize = MidiMessage::getMessageLengthFromFirstByte ((uint8_t) data[0]);
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return Span { data.data(), size == expectedSize ? size : (size_t) 0 };
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}
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void appendByte (std::byte x)
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{
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jassert (size < data.size());
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data[size++] = x;
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}
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RunningStatus withAppendedByte (std::byte x) const
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{
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auto result = *this;
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result.appendByte (x);
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return result;
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}
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};
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using State = std::variant<RunningStatus, InSysex>;
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State state;
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};
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//==============================================================================
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/**
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Helper class that takes chunks of incoming midi bytes, packages them into
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messages, and dispatches them to a midi callback.
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@tags{Audio}
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*/
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class MidiDataConcatenator
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{
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public:
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MidiDataConcatenator (int initialBufferSize)
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{
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pendingSysexData.reserve ((size_t) initialBufferSize);
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}
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MidiDataConcatenator (MidiDataConcatenator&&) noexcept = default;
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MidiDataConcatenator& operator= (MidiDataConcatenator&&) noexcept = default;
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void reset()
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{
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extractor.reset();
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pendingSysexData.clear();
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pendingSysexTime = 0;
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}
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template <typename UserDataType, typename CallbackType>
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void pushMidiData (Span<const std::byte> bytes,
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double time,
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UserDataType* input,
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CallbackType& callback)
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{
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extractor.push (bytes, [&] (SysexExtractorCallbackKind kind, Span<const std::byte> bytesThisTime)
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{
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switch (kind)
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{
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case SysexExtractorCallbackKind::notSysex:
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callback.handleIncomingMidiMessage (input,
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MidiMessage (bytesThisTime.data(),
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(int) bytesThisTime.size(),
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time));
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return;
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case SysexExtractorCallbackKind::ongoingSysex:
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{
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if (pendingSysexData.empty())
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pendingSysexTime = time;
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pendingSysexData.insert (pendingSysexData.end(), bytesThisTime.begin(), bytesThisTime.end());
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return;
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}
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case SysexExtractorCallbackKind::lastSysex:
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{
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pendingSysexData.insert (pendingSysexData.end(), bytesThisTime.begin(), bytesThisTime.end());
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if (pendingSysexData.empty())
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{
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jassertfalse;
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return;
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}
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if (pendingSysexData.back() == std::byte { 0xf7 })
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{
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callback.handleIncomingMidiMessage (input,
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MidiMessage (pendingSysexData.data(),
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(int) pendingSysexData.size(),
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pendingSysexTime));
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}
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else
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{
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callback.handlePartialSysexMessage (input,
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unalignedPointerCast<const uint8*> (pendingSysexData.data()),
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(int) pendingSysexData.size(),
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pendingSysexTime);
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}
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pendingSysexData.clear();
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return;
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}
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}
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});
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}
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template <typename UserDataType, typename CallbackType>
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void pushMidiData (const void* inputData,
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int numBytes,
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double time,
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UserDataType* input,
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CallbackType& callback)
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{
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pushMidiData ({ static_cast<const std::byte*> (inputData), (size_t) numBytes }, time, input, callback);
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}
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private:
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BytestreamSysexExtractor extractor;
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std::vector<std::byte> pendingSysexData;
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double pendingSysexTime = 0;
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JUCE_DECLARE_NON_COPYABLE (MidiDataConcatenator)
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};
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} // namespace juce
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