JUCE/modules/juce_audio_basics/midi/ump/juce_UMPConverters.h

/*
  ==============================================================================

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  ==============================================================================
*/

/** @cond */
namespace juce::universal_midi_packets
{
    /**
        Allows conversion from bytestream- or Universal MIDI Packet-formatted
        messages to MIDI 1.0 messages in UMP format.

        @tags{Audio}
    */
    struct ToUMP1Converter
    {
        template <typename Fn>
        void convert (const BytesOnGroup& m, Fn&& fn)
        {
            Conversion::toMidi1 (m, std::forward<Fn> (fn));
        }

        template <typename Fn>
        void convert (const View& v, Fn&& fn)
        {
            Conversion::midi2ToMidi1DefaultTranslation (v, std::forward<Fn> (fn));
        }
    };

    /**
        Allows conversion from bytestream- or Universal MIDI Packet-formatted
        messages to MIDI 2.0 messages in UMP format.

        @tags{Audio}
    */
    struct ToUMP2Converter
    {
        template <typename Fn>
        void convert (const BytesOnGroup& m, Fn&& fn)
        {
            Conversion::toMidi1 (m, [&] (const View& v)
            {
                translator.dispatch (v, fn);
            });
        }

        template <typename Fn>
        void convert (const View& v, Fn&& fn)
        {
            translator.dispatch (v, std::forward<Fn> (fn));
        }

        void reset()
        {
            translator.reset();
        }

        Midi1ToMidi2DefaultTranslator translator;
    };

    /**
        Allows conversion from bytestream- or Universal MIDI Packet-formatted
        messages to UMP format.

        The packet protocol can be selected using the constructor parameter.

        @tags{Audio}
    */
    class GenericUMPConverter
    {
        template <typename This, typename... Args>
        static void visit (This& t, Args&&... args)
        {
            if (t.mode == PacketProtocol::MIDI_1_0)
                convertImpl (std::get<0> (t.converters), std::forward<Args> (args)...);
            else
                convertImpl (std::get<1> (t.converters), std::forward<Args> (args)...);
        }

    public:
        explicit GenericUMPConverter (PacketProtocol m)
            : mode (m) {}

        void reset()
        {
            std::get<1> (converters).reset();
        }

        template <typename Converter, typename Fn>
        static void convertImpl (Converter& converter, const BytesOnGroup& m, Fn&& fn)
        {
            converter.convert (m, std::forward<Fn> (fn));
        }

        template <typename Converter, typename Fn>
        static void convertImpl (Converter& converter, const View& m, Fn&& fn)
        {
            converter.convert (m, std::forward<Fn> (fn));
        }

        template <typename Converter, typename Fn>
        static void convertImpl (Converter& converter, Iterator b, Iterator e, Fn&& fn)
        {
            std::for_each (b, e, [&] (const auto& v)
            {
                convertImpl (converter, v, fn);
            });
        }

        template <typename Fn>
        void convert (const BytesOnGroup& m, Fn&& fn)
        {
            visit (*this, m, std::forward<Fn> (fn));
        }

        template <typename Fn>
        void convert (const View& v, Fn&& fn)
        {
            visit (*this, v, std::forward<Fn> (fn));
        }

        template <typename Fn>
        void convert (Iterator begin, Iterator end, Fn&& fn)
        {
            visit (*this, begin, end, std::forward<Fn> (fn));
        }

        PacketProtocol getProtocol() const noexcept { return mode; }

    private:
        std::tuple<ToUMP1Converter, ToUMP2Converter> converters;
        const PacketProtocol mode{};
    };

    /**
        Allows conversion from bytestream- or Universal MIDI Packet-formatted
        messages to bytestream format.

        @tags{Audio}
    */
    struct ToBytestreamConverter
    {
        explicit ToBytestreamConverter (int storageSize)
            : translator (storageSize) {}

        template <typename Fn>
        void convert (const MidiMessage& m, Fn&& fn)
        {
            fn (m);
        }

        template <typename Fn>
        void convert (const View& v, double time, Fn&& fn)
        {
            Conversion::midi2ToMidi1DefaultTranslation (v, [&] (const View& midi1)
            {
                translator.dispatch (midi1, time, fn);
            });
        }

        void reset() { translator.reset(); }

        SingleGroupMidi1ToBytestreamTranslator translator;
    };
} // namespace juce::universal_midi_packets
/** @endcond */