juce_UMPDispatcher.h

/*
  ==============================================================================
 
   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited
 
   JUCE is an open source library subject to commercial or open-source
   licensing.
 
   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.
 
   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.
 
  ==============================================================================
*/
 
#ifndef DOXYGEN
 
namespace juce::universal_midi_packets
{

class Dispatcher
{
public:
    void reset() { currentPacketLen = 0; }

    template <typename PacketCallbackFunction>
    void dispatch (const uint32_t* begin,
                   const uint32_t* end,
                   double timeStamp,
                   PacketCallbackFunction&& callback)
    {
        std::for_each (begin, end, [&] (uint32_t word)
        {
            nextPacket[currentPacketLen++] = word;
 
            if (currentPacketLen == Utils::getNumWordsForMessageType (nextPacket.front()))
            {
                callback (View (nextPacket.data()), timeStamp);
                currentPacketLen = 0;
            }
        });
    }
 
private:
    std::array<uint32_t, 4> nextPacket;
    size_t currentPacketLen = 0;
};
 
//==============================================================================
class BytestreamToUMPDispatcher
{
public:
    explicit BytestreamToUMPDispatcher (PacketProtocol pp, int storageSize)
        : concatenator (storageSize),
          converter (pp)
    {}
 
    void reset()
    {
        concatenator.reset();
        converter.reset();
    }

    template <typename PacketCallbackFunction>
    void dispatch (const uint8_t* begin,
                   const uint8_t* end,
                   double timestamp,
                   PacketCallbackFunction&& callback)
    {
        using CallbackPtr = decltype (std::addressof (callback));
 
       #if JUCE_MINGW
        #define JUCE_MINGW_HIDDEN_VISIBILITY __attribute__ ((visibility ("hidden")))
       #else
        #define JUCE_MINGW_HIDDEN_VISIBILITY
       #endif
 
        struct JUCE_MINGW_HIDDEN_VISIBILITY Callback
        {
            Callback (BytestreamToUMPDispatcher& d, CallbackPtr c)
                : dispatch (d), callbackPtr (c) {}
 
            void handleIncomingMidiMessage (void*, const MidiMessage& msg) const
            {
                Conversion::toMidi1 (BytestreamMidiView (&msg), [&] (const View& view)
                {
                    dispatch.converter.convert (view, *callbackPtr);
                });
            }
 
            void handlePartialSysexMessage (void*, const uint8_t*, int, double) const {}
 
            BytestreamToUMPDispatcher& dispatch;
            CallbackPtr callbackPtr = nullptr;
        };
 
       #undef JUCE_MINGW_HIDDEN_VISIBILITY
 
        Callback inputCallback { *this, &callback };
        concatenator.pushMidiData (begin, int (end - begin), timestamp, (void*) nullptr, inputCallback);
    }
 
private:
    MidiDataConcatenator concatenator;
    GenericUMPConverter converter;
};
 
//==============================================================================
class ToBytestreamDispatcher
{
public:
    explicit ToBytestreamDispatcher (int storageSize)
        : converter (storageSize) {}

    void reset()
    {
        dispatcher.reset();
        converter.reset();
    }

    template <typename BytestreamMessageCallback>
    void dispatch (const uint32_t* begin,
                   const uint32_t* end,
                   double timestamp,
                   BytestreamMessageCallback&& callback)
    {
        dispatcher.dispatch (begin, end, timestamp, [&] (const View& view, double time)
        {
            converter.convert (view, time, callback);
        });
    }
 
private:
    Dispatcher dispatcher;
    ToBytestreamConverter converter;
};
 
} // namespace juce::universal_midi_packets
 
#endif