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/*
* Load_ice.cpp
* ------------
* Purpose: ST26 (SoundTracker 2.6 / Ice Tracker) loader
* Notes : The only real difference to other SoundTracker formats is the way patterns are stored:
* Every pattern consists of four independent, re-usable tracks.
* 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 "MODTools.h"
OPENMPT_NAMESPACE_BEGIN
CSoundFile::ProbeResult CSoundFile::ProbeFileHeaderICE(MemoryFileReader file, const uint64 *pfilesize)
{
if(!file.CanRead(1464 + 4))
return ProbeWantMoreData;
file.Seek(1464);
char magic[4];
file.ReadArray(magic);
if(!IsMagic(magic, "MTN\0") && !IsMagic(magic, "IT10"))
return ProbeFailure;
file.Seek(20);
uint32 invalidBytes = 0;
for(SAMPLEINDEX smp = 1; smp <= 31; smp++)
{
MODSampleHeader sampleHeader;
file.ReadStruct(sampleHeader);
invalidBytes += sampleHeader.GetInvalidByteScore();
if(invalidBytes > MODSampleHeader::INVALID_BYTE_THRESHOLD)
return ProbeFailure;
}
const auto [numOrders, numTracks] = file.ReadArray<uint8, 2>();
if(numOrders > 128)
{
return ProbeFailure;
}
std::array<uint8, 128 * 4> tracks;
file.ReadArray(tracks);
for(auto track : tracks)
{
if(track > numTracks)
return ProbeFailure;
}
MPT_UNREFERENCED_PARAMETER(pfilesize);
return ProbeSuccess;
}
bool CSoundFile::ReadICE(FileReader &file, ModLoadingFlags loadFlags)
{
char magic[4];
if(!file.Seek(1464) || !file.ReadArray(magic))
{
return false;
}
if(IsMagic(magic, "MTN\0"))
{
InitializeGlobals(MOD_TYPE_MOD, 4);
m_modFormat.formatName = UL_("MnemoTroN SoundTracker");
m_modFormat.type = UL_("st26");
m_modFormat.madeWithTracker = UL_("SoundTracker 2.6");
m_modFormat.charset = mpt::Charset::Amiga_no_C1;
} else if(IsMagic(magic, "IT10"))
{
InitializeGlobals(MOD_TYPE_MOD, 4);
m_modFormat.formatName = UL_("Ice Tracker");
m_modFormat.type = UL_("ice");
m_modFormat.madeWithTracker = UL_("Ice Tracker 1.0 / 1.1");
m_modFormat.charset = mpt::Charset::Amiga_no_C1;
} else
{
return false;
}
// Reading song title
file.Seek(0);
file.ReadString<mpt::String::spacePadded>(m_songName, 20);
// Load Samples
m_nSamples = 31;
uint32 invalidBytes = 0;
for(SAMPLEINDEX smp = 1; smp <= 31; smp++)
{
MODSampleHeader sampleHeader;
file.ReadStruct(sampleHeader);
invalidBytes += ReadMODSample(sampleHeader, Samples[smp], m_szNames[smp], true);
if(invalidBytes > MODSampleHeader::INVALID_BYTE_THRESHOLD)
return false;
}
const auto [numOrders, numTracks] = file.ReadArray<uint8, 2>();
if(numOrders > 128)
return false;
std::array<uint8, 128 * 4> tracks;
file.ReadArray(tracks);
for(auto track : tracks)
{
if(track > numTracks)
return false;
}
if(loadFlags == onlyVerifyHeader)
return true;
// Now we can be pretty sure that this is a valid ICE file. Set up default song settings.
SetupMODPanning(true);
Order().SetDefaultSpeed(6);
Order().SetDefaultTempoInt(125);
m_nMinPeriod = 14 * 4;
m_nMaxPeriod = 3424 * 4;
m_nSamplePreAmp = 64;
m_SongFlags.set(SONG_PT_MODE | SONG_IMPORTED | SONG_FORMAT_NO_VOLCOL);
m_playBehaviour.reset(kMODOneShotLoops);
m_playBehaviour.set(kMODIgnorePanning);
m_playBehaviour.set(kMODSampleSwap); // untested
// Reading patterns
Order().resize(numOrders);
uint8 speed = 0;
if(loadFlags & loadPatternData)
Patterns.ResizeArray(numOrders);
for(PATTERNINDEX pat = 0; pat < numOrders; pat++)
{
Order()[pat] = pat;
if(!(loadFlags & loadPatternData) || !Patterns.Insert(pat, 64))
break;
for(CHANNELINDEX chn = 0; chn < 4; chn++)
{
file.Seek(1468 + tracks[pat * 4 + chn] * 64u * 4u);
ModCommand *m = Patterns[pat].GetpModCommand(0, chn);
for(ROWINDEX row = 0; row < 64; row++, m += 4)
{
const auto [command, param] = ReadMODPatternEntry(file, *m);
if((command || param)
&& !(command == 0x0E && param >= 0x10) // Exx only sets filter
&& !(command >= 0x05 && command <= 0x09)) // These don't exist in ST2.6
{
ConvertModCommand(*m, command, param);
} else
{
m->command = CMD_NONE;
}
}
}
// Handle speed command with both nibbles set - this enables auto-swing (alternates between the two nibbles)
auto m = Patterns[pat].begin();
for(ROWINDEX row = 0; row < 64; row++)
{
for(CHANNELINDEX chn = 0; chn < 4; chn++, m++)
{
if(m->command == CMD_SPEED || m->command == CMD_TEMPO)
{
m->command = CMD_SPEED;
if(m->param & 0xF0)
{
if((m->param >> 4) != (m->param & 0x0F) && (m->param & 0x0F) != 0)
{
// Both nibbles set
speed = m->param;
}
m->param >>= 4;
}
}
}
if(speed)
{
speed = mpt::rotr(speed, 4);
Patterns[pat].WriteEffect(EffectWriter(CMD_SPEED, speed & 0x0F).Row(row));
}
}
}
// Reading samples
if(loadFlags & loadSampleData)
{
file.Seek(1468 + numTracks * 64u * 4u);
for(SAMPLEINDEX smp = 1; smp <= 31; smp++) if(Samples[smp].nLength)
{
SampleIO(
SampleIO::_8bit,
SampleIO::mono,
SampleIO::littleEndian,
SampleIO::signedPCM)
.ReadSample(Samples[smp], file);
}
}
return true;
}
OPENMPT_NAMESPACE_END
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