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Functor-based MIDI command receiving

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This commit is contained in:
Jack Andersen
2016-05-20 12:57:34 -10:00
parent 7756fcaf76
commit df61d6678b
7 changed files with 194 additions and 130 deletions
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149
lib/audiodev/MIDIDecoder.cpp
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@@ -7,112 +7,118 @@ namespace boo
static inline uint8_t clamp7(uint8_t val) {return std::max(0, std::min(127, int(val)));}
bool MIDIDecoder::ReadController::readByte(uint8_t& a)
bool MIDIDecoder::_readContinuedValue(std::vector<uint8_t>::const_iterator& it,
std::vector<uint8_t>::const_iterator end,
uint32_t& valOut)
{
return m_in.receive(&a, 1) != 0;
}
bool MIDIDecoder::ReadController::read2Bytes(uint8_t& a, uint8_t& b)
{
uint8_t buf[2];
int len = m_in.receive(buf, 2);
a = buf[0];
b = buf[1];
return len > 1;
}
bool MIDIDecoder::ReadController::readBuffer(void* buf, size_t len)
{
return m_in.receive(buf, len) == len;
}
uint32_t MIDIDecoder::_readContinuedValue(uint8_t a)
{
uint32_t ret = a & 0x7f;
uint8_t a = *it++;
valOut = a & 0x7f;
if (a & 0x80)
{
ret <<= 7;
bool good = m_readControl.readByte(a);
if (!good)
return ret;
ret |= a & 0x7f;
if (it == end)
return false;
valOut <<= 7;
a = *it++;
valOut |= a & 0x7f;
if (a & 0x80)
{
ret <<= 7;
good = m_readControl.readByte(a);
if (!good)
return ret;
ret |= a & 0x7f;
if (it == end)
return false;
valOut <<= 7;
a = *it++;
valOut |= a & 0x7f;
}
}
return ret;
return true;
}
bool MIDIDecoder::receiveBytes()
std::vector<uint8_t>::const_iterator
MIDIDecoder::receiveBytes(std::vector<uint8_t>::const_iterator begin,
std::vector<uint8_t>::const_iterator end)
{
uint8_t a, b;
bool good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
std::vector<uint8_t>::const_iterator it = begin;
if (it == end)
return begin;
uint8_t a = *it++;
uint8_t b;
if (a & 0x80)
m_status = a;
else
b = a;
uint8_t chan = m_status & 0xf;
switch (Status(m_status & 0xf0))
{
case Status::NoteOff:
{
good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
if (it == end)
return begin;
a = *it++;
if (it == end)
return begin;
b = *it++;
m_out.noteOff(chan, clamp7(a), clamp7(b));
break;
}
case Status::NoteOn:
{
good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
if (it == end)
return begin;
a = *it++;
if (it == end)
return begin;
b = *it++;
m_out.noteOn(chan, clamp7(a), clamp7(b));
break;
}
case Status::NotePressure:
{
good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
if (it == end)
return begin;
a = *it++;
if (it == end)
return begin;
b = *it++;
m_out.notePressure(chan, clamp7(a), clamp7(b));
break;
}
case Status::ControlChange:
{
good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
if (it == end)
return begin;
a = *it++;
if (it == end)
return begin;
b = *it++;
m_out.controlChange(chan, clamp7(a), clamp7(b));
break;
}
case Status::ProgramChange:
{
m_out.programChange(chan, clamp7(b));
if (it == end)
return begin;
a = *it++;
m_out.programChange(chan, clamp7(a));
break;
}
case Status::ChannelPressure:
{
m_out.channelPressure(chan, clamp7(b));
if (it == end)
return begin;
a = *it++;
m_out.channelPressure(chan, clamp7(a));
break;
}
case Status::PitchBend:
{
good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
if (it == end)
return begin;
a = *it++;
if (it == end)
return begin;
b = *it++;
m_out.pitchBend(chan, clamp7(b) * 128 + clamp7(a));
break;
}
@@ -122,32 +128,37 @@ bool MIDIDecoder::receiveBytes()
{
case Status::SysEx:
{
uint32_t len = _readContinuedValue(a);
std::unique_ptr<uint8_t[]> buf(new uint8_t[len]);
if (!m_readControl.readBuffer(buf.get(), len))
return false;
m_out.sysex(buf.get(), len);
uint32_t len;
if (!_readContinuedValue(it, end, len) || end - it < len)
return begin;
m_out.sysex(&*it, len);
break;
}
case Status::TimecodeQuarterFrame:
{
good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
if (it == end)
return begin;
a = *it++;
m_out.timeCodeQuarterFrame(a >> 4 & 0x7, a & 0xf);
break;
}
case Status::SongPositionPointer:
{
good = m_readControl.read2Bytes(a, b);
if (!good)
return false;
if (it == end)
return begin;
a = *it++;
if (it == end)
return begin;
b = *it++;
m_out.songPositionPointer(clamp7(b) * 128 + clamp7(a));
break;
}
case Status::SongSelect:
{
m_out.songSelect(clamp7(b));
if (it == end)
return begin;
a = *it++;
m_out.songSelect(clamp7(a));
break;
}
case Status::TuneRequest:
@@ -175,7 +186,7 @@ bool MIDIDecoder::receiveBytes()
default: break;
}
return true;
return it;
}
}