mirror of https://github.com/AxioDL/amuse.git
352 lines
9.4 KiB
C++
352 lines
9.4 KiB
C++
#include "amuse/SongState.hpp"
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#include "amuse/Common.hpp"
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#include "amuse/Sequencer.hpp"
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namespace amuse
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{
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static uint32_t DecodeRLE(const unsigned char*& data)
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{
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uint32_t ret = 0;
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while (true)
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{
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uint32_t thisPart = *data & 0x7f;
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if (*data & 0x80)
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{
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++data;
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thisPart = thisPart * 256 + *data;
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if (thisPart == 0)
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return -1;
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}
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if (thisPart == 32767)
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{
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ret += 32767;
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data += 2;
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continue;
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}
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ret += thisPart;
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data += 1;
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break;
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}
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return ret;
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}
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static int32_t DecodeContinuousRLE(const unsigned char*& data)
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{
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int32_t ret = int32_t(DecodeRLE(data));
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if (ret >= 16384)
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return ret - 32767;
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return ret;
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}
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static uint32_t DecodeTimeRLE(const unsigned char*& data)
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{
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uint32_t ret = 0;
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while (true)
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{
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uint16_t thisPart = SBig(*reinterpret_cast<const uint16_t*>(data));
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if (thisPart == 0xffff)
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{
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ret += 65535;
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data += 4;
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continue;
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}
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ret += thisPart;
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data += 2;
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break;
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}
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return ret;
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}
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void SongState::Header::swapBig()
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{
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m_version = SBig(m_version);
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m_chanIdxOff = SBig(m_chanIdxOff);
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m_chanMapOff = SBig(m_chanMapOff);
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m_tempoTableOff = SBig(m_tempoTableOff);
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m_initialTempo = SBig(m_initialTempo);
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m_unkOff = SBig(m_unkOff);
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for (int i=0 ; i<64 ; ++i)
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m_chanOffs[i] = SBig(m_chanOffs[i]);
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}
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void SongState::ChanHeader::swapBig()
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{
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m_startTick = SBig(m_startTick);
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m_unk1 = SBig(m_unk1);
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m_unk2 = SBig(m_unk2);
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m_dataIndex = SBig(m_dataIndex);
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m_unk3 = SBig(m_unk3);
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m_startTick2 = SBig(m_startTick2);
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m_unk4 = SBig(m_unk4);
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m_unk5 = SBig(m_unk5);
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m_unk6 = SBig(m_unk6);
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m_unk7 = SBig(m_unk7);
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}
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void SongState::TempoChange::swapBig()
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{
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m_tick = SBig(m_tick);
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m_tempo = SBig(m_tempo);
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}
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void SongState::Channel::Header::swapBig()
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{
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m_type = SBig(m_type);
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m_pitchOff = SBig(m_pitchOff);
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m_modOff = SBig(m_modOff);
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}
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SongState::Channel::Channel(SongState& parent, uint8_t midiChan, uint32_t startTick,
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const unsigned char* song, const unsigned char* chan)
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: m_parent(parent), m_midiChan(midiChan), m_startTick(startTick), m_dataBase(chan + 12)
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{
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m_data = m_dataBase;
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Header header = *reinterpret_cast<const Header*>(chan);
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header.swapBig();
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if (header.m_type != 8)
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{
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m_data = nullptr;
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return;
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}
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if (header.m_pitchOff)
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m_pitchWheelData = song + header.m_pitchOff;
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if (header.m_modOff)
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m_modWheelData = song + header.m_modOff;
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m_waitCountdown = startTick;
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m_lastPitchTick = startTick;
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m_lastModTick = startTick;
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m_waitCountdown += int32_t(DecodeTimeRLE(m_data));
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}
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void SongState::initialize(const unsigned char* ptr)
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{
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m_header = *reinterpret_cast<const Header*>(ptr);
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m_header.swapBig();
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/* Initialize all channels */
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for (int i=0 ; i<64 ; ++i)
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{
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if (m_header.m_chanOffs[i])
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{
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ChanHeader cHeader = *reinterpret_cast<const ChanHeader*>(ptr + m_header.m_chanOffs[i]);
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cHeader.swapBig();
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const uint32_t* chanIdx = reinterpret_cast<const uint32_t*>(ptr + m_header.m_chanIdxOff);
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const uint8_t* chanMap = reinterpret_cast<const uint8_t*>(ptr + m_header.m_chanMapOff);
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m_channels[i].emplace(*this, chanMap[i], cHeader.m_startTick, ptr,
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ptr + SBig(chanIdx[cHeader.m_dataIndex]));
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}
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else
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m_channels[i] = std::experimental::nullopt;
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}
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/* Initialize tempo */
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if (m_header.m_tempoTableOff)
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m_tempoPtr = reinterpret_cast<const TempoChange*>(ptr + m_header.m_tempoTableOff);
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else
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m_tempoPtr = nullptr;
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m_tempo = m_header.m_initialTempo;
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m_curTick = 0;
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m_songState = SongPlayState::Playing;
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}
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bool SongState::Channel::advance(Sequencer& seq, int32_t ticks)
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{
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if (!m_data)
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return true;
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int32_t endTick = m_parent.m_curTick + ticks;
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/* Update continuous pitch data */
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if (m_pitchWheelData)
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{
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int32_t pitchTick = m_parent.m_curTick;
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int32_t remPitchTicks = ticks;
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while (pitchTick < endTick)
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{
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/* See if there's an upcoming pitch change in this interval */
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const unsigned char* ptr = m_pitchWheelData;
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uint32_t deltaTicks = DecodeRLE(ptr);
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if (deltaTicks != -1)
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{
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uint32_t nextTick = m_lastPitchTick + deltaTicks;
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if (pitchTick + remPitchTicks > nextTick)
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{
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/* Update pitch */
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int32_t pitchDelta = DecodeContinuousRLE(ptr);
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m_lastPitchVal += pitchDelta;
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m_pitchWheelData = ptr;
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m_lastPitchTick = nextTick;
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remPitchTicks -= (nextTick - pitchTick);
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pitchTick = nextTick;
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seq.setPitchWheel(m_midiChan, clamp(-1.f, m_lastPitchVal / 8192.f, 1.f));
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continue;
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}
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remPitchTicks -= (nextTick - pitchTick);
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pitchTick = nextTick;
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}
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else
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break;
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}
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}
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/* Update continuous modulation data */
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if (m_modWheelData)
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{
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int32_t modTick = m_parent.m_curTick;
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int32_t remModTicks = ticks;
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while (modTick < endTick)
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{
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/* See if there's an upcoming modulation change in this interval */
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const unsigned char* ptr = m_modWheelData;
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uint32_t deltaTicks = DecodeRLE(ptr);
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if (deltaTicks != -1)
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{
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uint32_t nextTick = m_lastModTick + deltaTicks;
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if (modTick + remModTicks > nextTick)
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{
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/* Update modulation */
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int32_t modDelta = DecodeContinuousRLE(ptr);
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m_lastModVal += modDelta;
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m_modWheelData = ptr;
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m_lastModTick = nextTick;
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remModTicks -= (nextTick - modTick);
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modTick = nextTick;
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seq.setCtrlValue(m_midiChan, 1, clamp(0, (m_lastModVal + 8192) * 128 / 16384, 127));
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continue;
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}
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remModTicks -= (nextTick - modTick);
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modTick = nextTick;
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}
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else
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break;
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}
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}
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/* Stop finished notes */
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for (int i=0 ; i<128 ; ++i)
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{
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if (m_remNoteLengths[i])
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{
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if (m_remNoteLengths[i] <= ticks)
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{
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seq.keyOff(m_midiChan, i, 0);
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m_remNoteLengths[i] = 0;
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}
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else
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m_remNoteLengths[i] -= ticks;
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}
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}
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/* Loop through as many commands as we can for this time period */
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while (true)
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{
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/* Advance wait timer if active, returning if waiting */
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if (m_waitCountdown)
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{
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m_waitCountdown -= ticks;
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ticks = 0;
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if (m_waitCountdown > 0)
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return false;
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}
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/* Load next command */
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if (*reinterpret_cast<const uint16_t*>(m_data) == 0xffff)
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{
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/* End of channel */
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m_data = nullptr;
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return true;
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}
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else if (m_data[0] & 0x80)
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{
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/* Control change */
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uint8_t val = m_data[0] & 0x7f;
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uint8_t ctrl = m_data[1] & 0x7f;
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seq.setCtrlValue(m_midiChan, ctrl, val);
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m_data += 2;
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}
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else
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{
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/* Note */
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uint8_t note = m_data[0] & 0x7f;
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uint8_t vel = m_data[1] & 0x7f;
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uint16_t length = SBig(*reinterpret_cast<const uint16_t*>(m_data + 2));
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seq.keyOn(m_midiChan, note, vel);
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m_remNoteLengths[note] = length;
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m_data += 4;
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}
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/* Set next delta-time */
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m_waitCountdown += int32_t(DecodeTimeRLE(m_data));
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}
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return false;
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}
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bool SongState::advance(Sequencer& seq, double dt)
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{
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/* Stopped */
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if (m_songState == SongPlayState::Stopped)
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return true;
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bool done = false;
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m_curDt += dt;
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while (m_curDt > 0.0)
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{
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done = true;
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/* Compute ticks to compute based on current tempo */
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double ticksPerSecond = m_tempo * 384 / 60;
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int32_t remTicks = std::ceil(m_curDt * ticksPerSecond);
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if (!remTicks)
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break;
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/* See if there's an upcoming tempo change in this interval */
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if (m_tempoPtr && m_tempoPtr->m_tick != 0xffffffff)
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{
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TempoChange change = *m_tempoPtr;
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change.swapBig();
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if (m_curTick + remTicks > change.m_tick)
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remTicks = change.m_tick - m_curTick;
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if (remTicks <= 0)
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{
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/* Turn over tempo */
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m_tempo = change.m_tempo;
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++m_tempoPtr;
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continue;
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}
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}
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/* Advance all channels */
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for (std::experimental::optional<Channel>& chan : m_channels)
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if (chan)
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done &= chan->advance(seq, remTicks);
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m_curTick += remTicks;
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if (m_tempo == 0)
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m_curDt = 0.0;
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else
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m_curDt -= remTicks / ticksPerSecond;
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}
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if (done)
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m_songState = SongPlayState::Stopped;
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return done;
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}
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}
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