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winamp/Src/external_dependencies/openmpt-trunk/soundlib/Load_dsym.cpp

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/*
* Load_dsym.cpp
* -------------
* Purpose: Digital Symphony module loader
* Notes : Based on information from the DSym_Info file and sigma-delta decompression code from TimPlayer.
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#include "stdafx.h"
#include "Loaders.h"
#include "BitReader.h"
OPENMPT_NAMESPACE_BEGIN
struct DSymFileHeader
{
char magic[8];
uint8le version; // 0 / 1
uint8le numChannels; // 1...8
uint16le numOrders; // 0...4096
uint16le numTracks; // 0...4096
uint16le infoLenLo;
uint8le infoLenHi;
bool Validate() const
{
return !std::memcmp(magic, "\x02\x01\x13\x13\x14\x12\x01\x0B", 8)
&& version <= 1
&& numChannels >= 1 && numChannels <= 8
&& numOrders <= 4096
&& numTracks <= 4096;
}
uint64 GetHeaderMinimumAdditionalSize() const
{
return 72u;
}
};
MPT_BINARY_STRUCT(DSymFileHeader, 17)
static std::vector<std::byte> DecompressDSymLZW(FileReader &file, uint32 size)
{
BitReader bitFile(file);
const auto startPos = bitFile.GetPosition();
// In the best case, 13 bits decode 8192 bytes, a ratio of approximately 1:5042.
// Too much for reserving memory in case of malformed files, just choose an arbitrary but realistic upper limit.
std::vector<std::byte> output;
output.reserve(std::min(size, std::min(mpt::saturate_cast<uint32>(file.BytesLeft()), Util::MaxValueOfType(size) / 50u) * 50u));
static constexpr uint16 lzwBits = 13, MaxNodes = 1 << lzwBits;
static constexpr uint16 ResetDict = 256, EndOfStream = 257;
struct LZWEntry
{
uint16 prev;
std::byte value;
};
std::vector<LZWEntry> dictionary(MaxNodes);
std::vector<std::byte> match(MaxNodes);
// Initialize dictionary
for(int i = 0; i < 256; i++)
{
dictionary[i].prev = MaxNodes;
dictionary[i].value = static_cast<std::byte>(i);
}
uint8 codeSize = 9;
uint16 prevCode = 0;
uint16 nextIndex = 257;
while(true)
{
// Read next code
const auto newCode = static_cast<uint16>(bitFile.ReadBits(codeSize));
if(newCode == EndOfStream || newCode > nextIndex || output.size() >= size)
break;
// Reset dictionary
if(newCode == ResetDict)
{
codeSize = 9;
prevCode = 0;
nextIndex = 257;
continue;
}
// Output
auto code = (newCode < nextIndex) ? newCode : prevCode;
auto writeOffset = MaxNodes;
do
{
match[--writeOffset] = dictionary[code].value;
code = dictionary[code].prev;
} while(code < MaxNodes);
output.insert(output.end(), match.begin() + writeOffset, match.end());
// Handling for KwKwK problem
if(newCode == nextIndex)
output.push_back(match[writeOffset]);
// Add to dictionary
if(nextIndex < MaxNodes)
{
// Special case for FULLEFFECT, NARCOSIS and NEWDANCE, which end with a dictionary size of 512
// right before the end-of-stream token, but the code size is expected to be 9
if(output.size() >= size)
continue;
dictionary[nextIndex].value = match[writeOffset];
dictionary[nextIndex].prev = prevCode;
nextIndex++;
if(nextIndex != MaxNodes && nextIndex == (1u << codeSize))
codeSize++;
}
prevCode = newCode;
}
MPT_ASSERT(output.size() == size);
// Align length to 4 bytes
file.Seek(startPos + ((bitFile.GetPosition() - startPos + 3u) & ~FileReader::off_t(3)));
return output;
}
static std::vector<std::byte> DecompressDSymSigmaDelta(FileReader &file, uint32 size)
{
const uint8 maxRunLength = std::max(file.ReadUint8(), uint8(1));
BitReader bitFile(file);
const auto startPos = bitFile.GetPosition();
// In the best case, sigma-delta compression represents each sample point as one bit.
// As a result, if we have a file length of n, we know that the sample can be at most n*8 sample points long.
LimitMax(size, std::min(mpt::saturate_cast<uint32>(file.BytesLeft()), Util::MaxValueOfType(size) / 8u) * 8u);
std::vector<std::byte> output(size);
uint32 pos = 0;
uint8 runLength = maxRunLength;
uint8 numBits = 8;
uint8 accum = static_cast<uint8>(bitFile.ReadBits(numBits));
output[pos++] = mpt::byte_cast<std::byte>(accum);
while(pos < size)
{
const uint32 value = bitFile.ReadBits(numBits);
// Increase bit width
if(value == 0)
{
if(numBits >= 9)
break;
numBits++;
runLength = maxRunLength;
continue;
}
if(value & 1)
accum -= static_cast<uint8>(value >> 1);
else
accum += static_cast<uint8>(value >> 1);
output[pos++] = mpt::byte_cast<std::byte>(accum);
// Reset run length if high bit is set
if((value >> (numBits - 1u)) != 0)
{
runLength = maxRunLength;
continue;
}
// Decrease bit width
if(--runLength == 0)
{
if(numBits > 1)
numBits--;
runLength = maxRunLength;
}
}
// Align length to 4 bytes
file.Seek(startPos + ((bitFile.GetPosition() - startPos + 3u) & ~FileReader::off_t(3)));
return output;
}
static bool ReadDSymChunk(FileReader &file, std::vector<std::byte> &data, uint32 size)
{
const uint8 packingType = file.ReadUint8();
if(packingType > 1)
return false;
if(packingType)
{
try
{
data = DecompressDSymLZW(file, size);
} catch(const BitReader::eof &)
{
return false;
}
} else
{
if(!file.CanRead(size))
return false;
file.ReadVector(data, size);
}
return data.size() >= size;
}
CSoundFile::ProbeResult CSoundFile::ProbeFileHeaderDSym(MemoryFileReader file, const uint64 *pfilesize)
{
DSymFileHeader fileHeader;
if(!file.ReadStruct(fileHeader))
return ProbeWantMoreData;
if(!fileHeader.Validate())
return ProbeFailure;
return ProbeAdditionalSize(file, pfilesize, fileHeader.GetHeaderMinimumAdditionalSize());
}
bool CSoundFile::ReadDSym(FileReader &file, ModLoadingFlags loadFlags)
{
DSymFileHeader fileHeader;
file.Rewind();
if(!file.ReadStruct(fileHeader) || !fileHeader.Validate())
return false;
if(!file.CanRead(mpt::saturate_cast<FileReader::off_t>(fileHeader.GetHeaderMinimumAdditionalSize())))
return false;
if(loadFlags == onlyVerifyHeader)
return true;
InitializeGlobals(MOD_TYPE_MOD);
m_SongFlags.set(SONG_IMPORTED | SONG_AMIGALIMITS);
m_SongFlags.reset(SONG_ISAMIGA);
m_nChannels = fileHeader.numChannels;
m_nSamples = 63;
for(CHANNELINDEX chn = 0; chn < m_nChannels; chn++)
{
InitChannel(chn);
ChnSettings[chn].nPan = (((chn & 3) == 1) || ((chn & 3) == 2)) ? 64 : 192;
}
uint8 sampleNameLength[64] = {};
for(SAMPLEINDEX smp = 1; smp <= m_nSamples; smp++)
{
Samples[smp].Initialize(MOD_TYPE_MOD);
sampleNameLength[smp] = file.ReadUint8();
if(!(sampleNameLength[smp] & 0x80))
Samples[smp].nLength = file.ReadUint24LE() << 1;
}
file.ReadSizedString<uint8le, mpt::String::spacePadded>(m_songName);
const auto allowedCommands = file.ReadArray<uint8, 8>();
std::vector<std::byte> sequenceData;
if(fileHeader.numOrders)
{
const uint32 sequenceSize = fileHeader.numOrders * fileHeader.numChannels * 2u;
if(!ReadDSymChunk(file, sequenceData, sequenceSize))
return false;
}
const auto sequence = mpt::as_span(reinterpret_cast<uint16le *>(sequenceData.data()), sequenceData.size() / 2u);
std::vector<std::byte> trackData;
trackData.reserve(fileHeader.numTracks * 256u);
// For some reason, patterns are stored in 512K chunks
for(uint16 offset = 0; offset < fileHeader.numTracks; offset += 2000)
{
const uint32 chunkSize = std::min(fileHeader.numTracks - offset, 2000) * 256;
std::vector<std::byte> chunk;
if(!ReadDSymChunk(file, chunk, chunkSize))
return false;
trackData.insert(trackData.end(), chunk.begin(), chunk.end());
}
const auto tracks = mpt::byte_cast<mpt::span<uint8>>(mpt::as_span(trackData));
Order().resize(fileHeader.numOrders);
for(ORDERINDEX pat = 0; pat < fileHeader.numOrders; pat++)
{
Order()[pat] = pat;
if(!(loadFlags & loadPatternData) || !Patterns.Insert(pat, 64))
continue;
for(CHANNELINDEX chn = 0; chn < m_nChannels; chn++)
{
const uint16 track = sequence[pat * m_nChannels + chn];
if(track >= fileHeader.numTracks)
continue;
ModCommand *m = Patterns[pat].GetpModCommand(0, chn);
for(ROWINDEX row = 0; row < 64; row++, m += m_nChannels)
{
const auto data = tracks.subspan(track * 256 + row * 4, 4);
m->note = data[0] & 0x3F;
if(m->note)
m->note += 47 + NOTE_MIN;
else
m->note = NOTE_NONE;
m->instr = (data[0] >> 6) | ((data[1] & 0x0F) << 2);
const uint8 command = (data[1] >> 6) | ((data[2] & 0x0F) << 2);
const uint16 param = (data[2] >> 4) | (data[3] << 4);
if(!(allowedCommands[command >> 3u] & (1u << (command & 7u))))
continue;
if(command == 0 && param == 0)
continue;
m->command = command;
m->param = static_cast<uint8>(param);
m->vol = static_cast<ModCommand::VOL>(param >> 8);
switch(command)
{
case 0x00: // 00 xyz Normal play or Arpeggio + Volume Slide Up
case 0x01: // 01 xyy Slide Up + Volume Slide Up
case 0x02: // 01 xyy Slide Up + Volume Slide Up
case 0x20: // 20 xyz Normal play or Arpeggio + Volume Slide Down
case 0x21: // 21 xyy Slide Up + Volume Slide Down
case 0x22: // 22 xyy Slide Down + Volume Slide Down
m->command &= 0x0F;
ConvertModCommand(*m);
if(m->vol)
m->volcmd = (command < 0x20) ? VOLCMD_VOLSLIDEUP : VOLCMD_VOLSLIDEDOWN;
break;
case 0x03: // 03 xyy Tone Portamento
case 0x04: // 04 xyz Vibrato
case 0x05: // 05 xyz Tone Portamento + Volume Slide
case 0x06: // 06 xyz Vibrato + Volume Slide
case 0x07: // 07 xyz Tremolo
case 0x0C: // 0C xyy Set Volume
ConvertModCommand(*m);
break;
case 0x09: // 09 xxx Set Sample Offset
m->command = CMD_OFFSET;
m->param = static_cast<ModCommand::PARAM>(param >> 1);
if(param >= 0x200)
{
m->volcmd = VOLCMD_OFFSET;
m->vol >>= 1;
}
break;
case 0x0A: // 0A xyz Volume Slide + Fine Slide Up
case 0x2A: // 2A xyz Volume Slide + Fine Slide Down
if(param < 0xFF)
{
m->command &= 0x0F;
ConvertModCommand(*m);
} else
{
m->command = CMD_MODCMDEX;
m->param = static_cast<ModCommand::PARAM>(((command < 0x20) ? 0x10 : 0x20) | (param >> 8));
if(param & 0xF0)
{
m->volcmd = VOLCMD_VOLSLIDEUP;
m->vol = static_cast<ModCommand::VOL>((param >> 4) & 0x0F);
} else
{
m->volcmd = VOLCMD_VOLSLIDEDOWN;
m->vol = static_cast<ModCommand::VOL>(param & 0x0F);
}
}
break;
case 0x0B: // 0B xxx Position Jump
case 0x0F: // 0F xxx Set Speed
m->command = (command == 0x0B) ? CMD_POSITIONJUMP : CMD_SPEED;
m->param = mpt::saturate_cast<ModCommand::PARAM>(param);
break;
case 0x0D: // 0D xyy Pattern Break (not BCD-encoded like in MOD)
m->command = CMD_PATTERNBREAK;
if(m->param > 63)
m->param = 0;
break;
case 0x10: // 10 xxy Filter Control (not implemented in Digital Symphony)
case 0x13: // 13 xxy Glissando Control
case 0x14: // 14 xxy Set Vibrato Waveform
case 0x15: // 15 xxy Set Fine Tune
case 0x17: // 17 xxy Set Tremolo Waveform
case 0x1F: // 1F xxy Invert Loop
m->command = CMD_MODCMDEX;
m->param = (command << 4) | (m->param & 0x0F);
break;
case 0x16: // 16 xxx Jump to Loop
case 0x19: // 19 xxx Retrig Note
case 0x1C: // 1C xxx Note Cut
case 0x1D: // 1D xxx Note Delay
case 0x1E: // 1E xxx Pattern Delay
m->command = CMD_MODCMDEX;
m->param = (command << 4) | static_cast<ModCommand::PARAM>(std::min(param, uint16(0x0F)));
break;
case 0x11: // 11 xyy Fine Slide Up + Fine Volume Slide Up
case 0x12: // 12 xyy Fine Slide Down + Fine Volume Slide Up
case 0x1A: // 1A xyy Fine Slide Up + Fine Volume Slide Down
case 0x1B: // 1B xyy Fine Slide Down + Fine Volume Slide Down
m->command = CMD_MODCMDEX;
if(m->param & 0xFF)
{
m->param = static_cast<ModCommand::PARAM>(((command == 0x11 || command == 0x1A) ? 0x10 : 0x20) | (param & 0x0F));
if(param & 0xF00)
m->volcmd = (command >= 0x1A) ? VOLCMD_FINEVOLDOWN : VOLCMD_FINEVOLUP;
} else
{
m->param = static_cast<ModCommand::PARAM>(((command >= 0x1A) ? 0xB0 : 0xA0) | (param >> 8));
}
break;
case 0x2F: // 2F xxx Set Tempo
if(param > 0)
{
m->command = CMD_TEMPO;
m->param = mpt::saturate_cast<ModCommand::PARAM>(std::max(8, param + 4) / 8);
#ifdef MODPLUG_TRACKER
m->param = std::max(m->param, ModCommand::PARAM(0x20));
#endif
} else
{
m->command = CMD_NONE;
}
break;
case 0x2B: // 2B xyy Line Jump
m->command = CMD_PATTERNBREAK;
for(CHANNELINDEX brkChn = 0; brkChn < m_nChannels; brkChn++)
{
ModCommand &cmd = *(m - chn + brkChn);
if(cmd.command != CMD_NONE)
continue;
cmd.command = CMD_POSITIONJUMP;
cmd.param = mpt::saturate_cast<ModCommand::PARAM>(pat);
}
break;
case 0x30: // 30 xxy Set Stereo
m->command = CMD_PANNING8;
if(param & 7)
{
static constexpr uint8 panning[8] = {0x00, 0x00, 0x2B, 0x56, 0x80, 0xAA, 0xD4, 0xFF};
m->param = panning[param & 7];
} else if((param >> 4) != 0x80)
{
m->param = static_cast<ModCommand::PARAM>(param >> 4);
if(m->param < 0x80)
m->param += 0x80;
else
m->param = 0xFF - m->param;
} else
{
m->command = CMD_NONE;
}
break;
case 0x32: // 32 xxx Unset Sample Repeat
m->command = CMD_NONE;
m->param = 0;
if(m->note == NOTE_NONE)
m->note = NOTE_KEYOFF;
else
m->command = CMD_KEYOFF;
break;
case 0x31: // 31 xxx Song Upcall
default:
m->command = CMD_NONE;
break;
}
}
}
}
for(SAMPLEINDEX smp = 1; smp <= m_nSamples; smp++)
{
file.ReadString<mpt::String::maybeNullTerminated>(m_szNames[smp], sampleNameLength[smp] & 0x3F);
if(sampleNameLength[smp] & 0x80)
continue;
ModSample &mptSmp = Samples[smp];
mptSmp.nSustainStart = file.ReadUint24LE() << 1;
if(const auto loopLen = file.ReadUint24LE() << 1; loopLen > 2)
{
mptSmp.nSustainEnd = mptSmp.nSustainStart + loopLen;
mptSmp.uFlags.set(CHN_SUSTAINLOOP);
}
mptSmp.nVolume = std::min(file.ReadUint8(), uint8(64)) * 4u;
mptSmp.nFineTune = MOD2XMFineTune(file.ReadUint8());
mptSmp.Set16BitCuePoints();
if(!mptSmp.nLength)
continue;
const uint8 packingType = file.ReadUint8();
switch(packingType)
{
case 0: // Modified u-Law
if(loadFlags & loadSampleData)
{
std::vector<std::byte> sampleData;
if(!file.CanRead(mptSmp.nLength))
return false;
file.ReadVector(sampleData, mptSmp.nLength);
for(auto &b : sampleData)
{
uint8 v = mpt::byte_cast<uint8>(b);
v = (v << 7) | (static_cast<uint8>(~v) >> 1);
b = mpt::byte_cast<std::byte>(v);
}
FileReader sampleDataFile = FileReader(mpt::as_span(sampleData));
SampleIO(
SampleIO::_16bit,
SampleIO::mono,
SampleIO::littleEndian,
SampleIO::uLaw)
.ReadSample(mptSmp, sampleDataFile);
} else
{
file.Skip(mptSmp.nLength);
}
break;
case 1: // 13-bit LZW applied to linear sample data differences
{
std::vector<std::byte> sampleData;
try
{
sampleData = DecompressDSymLZW(file, mptSmp.nLength);
} catch(const BitReader::eof &)
{
return false;
}
if(!(loadFlags & loadSampleData))
break;
FileReader sampleDataFile = FileReader(mpt::as_span(sampleData));
SampleIO(
SampleIO::_8bit,
SampleIO::mono,
SampleIO::littleEndian,
SampleIO::deltaPCM)
.ReadSample(mptSmp, sampleDataFile);
}
break;
case 2: // 8-bit signed
case 3: // 16-bit signed
if(loadFlags & loadSampleData)
{
SampleIO(
(packingType == 2) ? SampleIO::_8bit : SampleIO::_16bit,
SampleIO::mono,
SampleIO::littleEndian,
SampleIO::signedPCM)
.ReadSample(mptSmp, file);
} else
{
file.Skip(mptSmp.nLength * (packingType - 1));
}
break;
case 4: // Sigma-Delta compression applied to linear sample differences
case 5: // Sigma-Delta compression applied to logarithmic sample differences
{
std::vector<std::byte> sampleData;
try
{
sampleData = DecompressDSymSigmaDelta(file, mptSmp.nLength);
} catch(const BitReader::eof &)
{
return false;
}
if(!(loadFlags & loadSampleData))
break;
if(packingType == 5)
{
static constexpr uint8 xorMask[] = {0x00, 0x7F};
for(auto &b : sampleData)
{
uint8 v = mpt::byte_cast<uint8>(b);
v ^= xorMask[v >> 7];
b = mpt::byte_cast<std::byte>(v);
}
}
FileReader sampleDataFile = FileReader(mpt::as_span(sampleData));
SampleIO(
(packingType == 5) ? SampleIO::_16bit : SampleIO::_8bit,
SampleIO::mono,
SampleIO::littleEndian,
(packingType == 5) ? SampleIO::uLaw : SampleIO::unsignedPCM)
.ReadSample(mptSmp, sampleDataFile);
}
break;
default:
return false;
}
}
if(const uint32 infoLen = fileHeader.infoLenLo | (fileHeader.infoLenHi << 16); infoLen > 0)
{
std::vector<std::byte> infoData;
if(!ReadDSymChunk(file, infoData, infoLen))
return false;
FileReader infoChunk = FileReader(mpt::as_span(infoData));
m_songMessage.Read(infoChunk, infoLen, SongMessage::leLF);
}
m_modFormat.formatName = MPT_UFORMAT("Digital Symphony v{}")(fileHeader.version);
m_modFormat.type = U_("dsym"); // RISC OS doesn't use file extensions but this is a common abbreviation used for this tracker
m_modFormat.madeWithTracker = U_("Digital Symphony");
m_modFormat.charset = mpt::Charset::RISC_OS;
return true;
}
OPENMPT_NAMESPACE_END
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