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juce_UMPMidi1ToMidi2DefaultTranslator.cpp
/*
==============================================================================
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.
==============================================================================
*/
namespace juce::universal_midi_packets
{
PacketX2 Midi1ToMidi2DefaultTranslator::processNoteOnOrOff (const HelperValues helpers)
{
const auto velocity = helpers.byte2;
const auto needsConversion = (helpers.byte0 & std::byte { 0xf0 }) == std::byte { 0x90 } && velocity == std::byte { 0 };
const auto firstByte = needsConversion ? (std::byte { 0x80 } | (helpers.byte0 & std::byte { 0xf }))
: helpers.byte0;
return PacketX2
{
Utils::bytesToWord (helpers.typeAndGroup, firstByte, helpers.byte1, std::byte { 0 }),
(uint32_t) (Conversion::scaleTo16 (uint8_t (velocity)) << 0x10)
};
}
PacketX2 Midi1ToMidi2DefaultTranslator::processPolyPressure (const HelperValues helpers)
{
return PacketX2
{
Utils::bytesToWord (helpers.typeAndGroup, helpers.byte0, helpers.byte1, std::byte { 0 }),
Conversion::scaleTo32 (uint8_t (helpers.byte2))
};
}
bool Midi1ToMidi2DefaultTranslator::processControlChange (const HelperValues helpers,
PacketX2& packet)
{
const auto statusAndChannel = helpers.byte0;
const auto cc = uint8_t (helpers.byte1);
const auto shouldAccumulate = [&]
{
switch (cc)
{
case 6:
case 38:
case 98:
case 99:
case 100:
case 101:
return true;
}
return false;
}();
const auto group = (uint8_t) (helpers.typeAndGroup & std::byte { 0xf });
const auto channel = (uint8_t) (statusAndChannel & std::byte { 0xf });
const auto byte = helpers.byte2;
if (shouldAccumulate)
{
auto& accumulator = groupAccumulators[group][channel];
if (accumulator.addByte (cc, byte))
{
const auto& bytes = accumulator.getBytes();
const auto bank = bytes[0];
const auto index = bytes[1];
const auto msb = bytes[2];
const auto lsb = bytes[3];
const auto value = uint16_t ((uint16_t (msb & std::byte { 0x7f }) << 7) | uint16_t (lsb & std::byte { 0x7f }));
const auto newStatus = (uint8_t) (accumulator.getKind() == PnKind::nrpn ? 0x3 : 0x2);
packet = PacketX2
{
Utils::bytesToWord (helpers.typeAndGroup, std::byte ((newStatus << 0x4) | channel), bank, index),
Conversion::scaleTo32 (value)
};
return true;
}
return false;
}
if (cc == 0)
{
groupBanks[group][channel].setMsb (uint8_t (byte));
return false;
}
if (cc == 32)
{
groupBanks[group][channel].setLsb (uint8_t (byte));
return false;
}
packet = PacketX2
{
Utils::bytesToWord (helpers.typeAndGroup, statusAndChannel, std::byte { cc }, std::byte { 0 }),
Conversion::scaleTo32 (uint8_t (helpers.byte2))
};
return true;
}
PacketX2 Midi1ToMidi2DefaultTranslator::processProgramChange (const HelperValues helpers) const
{
const auto group = (uint8_t) (helpers.typeAndGroup & std::byte { 0xf });
const auto channel = (uint8_t) (helpers.byte0 & std::byte { 0xf });
const auto bank = groupBanks[group][channel];
const auto valid = bank.isValid();
return PacketX2
{
Utils::bytesToWord (helpers.typeAndGroup,
helpers.byte0,
std::byte { 0 },
valid ? std::byte { 1 } : std::byte { 0 }),
Utils::bytesToWord (helpers.byte1,
std::byte { 0 },
valid ? std::byte { bank.getMsb() } : std::byte { 0 },
valid ? std::byte { bank.getLsb() } : std::byte { 0 })
};
}
PacketX2 Midi1ToMidi2DefaultTranslator::processChannelPressure (const HelperValues helpers)
{
return PacketX2
{
Utils::bytesToWord (helpers.typeAndGroup, helpers.byte0, std::byte { 0 }, std::byte { 0 }),
Conversion::scaleTo32 (uint8_t (helpers.byte1))
};
}
PacketX2 Midi1ToMidi2DefaultTranslator::processPitchBend (const HelperValues helpers)
{
const auto lsb = helpers.byte1;
const auto msb = helpers.byte2;
const auto value = uint16_t (uint16_t (msb) << 7 | uint16_t (lsb));
return PacketX2
{
Utils::bytesToWord (helpers.typeAndGroup, helpers.byte0, std::byte { 0 }, std::byte { 0 }),
Conversion::scaleTo32 (value)
};
}
bool Midi1ToMidi2DefaultTranslator::PnAccumulator::addByte (uint8_t cc, std::byte byte)
{
const auto isStart = cc == 99 || cc == 101;
if (isStart)
{
kind = cc == 99 ? PnKind::nrpn : PnKind::rpn;
index = 0;
}
bytes[index] = byte;
const auto shouldContinue = [&]
{
switch (index)
{
case 0: return isStart;
case 1: return kind == PnKind::nrpn ? cc == 98 : cc == 100;
case 2: return cc == 6;
case 3: return cc == 38;
}
return false;
}();
index = shouldContinue ? index + 1 : 0;
if (index != bytes.size())
return false;
index = 0;
return true;
}
} // namespace juce::universal_midi_packets
juce::universal_midi_packets::Conversion::scaleTo32
static uint32_t scaleTo32(uint8_t word7Bit)
Definition juce_UMPConversion.h:170
juce::universal_midi_packets::Conversion::scaleTo16
static uint16_t scaleTo16(uint8_t word7Bit)
Definition juce_UMPConversion.h:152
juce::universal_midi_packets::Utils::bytesToWord
static constexpr uint32_t bytesToWord(std::byte a, std::byte b, std::byte c, std::byte d)
Definition juce_UMPUtils.h:36