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s3mContainer.cpp
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s3mContainer.cpp
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/*
* s3mContainer.cpp
*
* Created on: Sep 11, 2017
* Author: jussi
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <arpa/inet.h>
#include "s3mContainer.hpp"
#include "ALSAPlayer.hpp"
#include <thread>
static const uint32_t SamplingRate = 48000;
s3mContainer::s3mContainer() : m_name("")
{
ALSAConfig cfg;
cfg.channels = 2;
cfg.rate = SamplingRate;
m_player.initPlayer(cfg);
m_audioBufferSize = m_player.getBuffSize();
m_audioBufferVector.resize(m_audioBufferSize);
m_playerStatusFlags = 0;
}
s3mContainer::~s3mContainer()
{
/* fuckin ugly, use smart pointers! */
for(auto it = m_instruments.begin(); it != m_instruments.end(); it++)
{
if(it->sampleData) delete[] it->sampleData;
if(it->sampleDataL) delete[] it->sampleDataL;
if(it->sampleDataR) delete[] it->sampleDataR;
}
}
double s3mContainer::loadSample(const Instrument& ins, double& s, double incRate)
{
if(s >= ins.length)
{
return 0.0;
}
double retVal = ins.sampleData[static_cast<uint32_t>(s)] - 128.0;
s += incRate;
if((ins.flags & 1) && s >= ins.loopEnd)
{
s = ins.loopBegin + fmod(s - ins.loopBegin, ins.loopEnd - ins.loopBegin);
}
return retVal;
}
bool s3mContainer::loadStereoSample(const Instrument& ins, double& s, double incRate, double& retL, double& retR)
{
if(s >= ins.length)
{
return false;
}
retL = ins.sampleDataL[static_cast<uint32_t>(s)] - 128.0;
retR = ins.sampleDataR[static_cast<uint32_t>(s)] - 128.0;
s += incRate;
if((ins.flags & 1) && s >= ins.loopEnd)
{
s = ins.loopBegin + fmod(s - ins.loopBegin, ins.loopEnd - ins.loopBegin);
}
return true;
}
static int periodic = 0;
Slot s3mContainer::readSlot(const byte*& pSlot)
{
byte curByte = *pSlot++;
Slot ret = {static_cast<uint32_t>(curByte) & 0x1F, 255, 0, 255, 0, 0};
if(curByte & 0x20)
{
ret.note = *pSlot++;
ret.instrument = *pSlot++;
}
if(curByte & 0x40)
{
ret.volume = *pSlot++;
}
if(curByte & 0x80)
{
ret.command = *pSlot++;
ret.info = *pSlot++;
}
return ret;
}
void s3mContainer::loadSong(const std::string& filename)
{
if(filename.empty())
{
std::cout << "Invalid filename. Exiting" << std::endl;
std::exit(-1);
}
FILE *fp = nullptr;
fp = fopen(filename.c_str(), "rb");
if(!fp)
{
std::cout << "Could not open file. Exiting" << std::endl;
std::exit(-1);
}
/*
* Read the stuff to the class member variables
* This is a very ugly way to do it, but come up with better yourself
*/
std::cout << "\n=== LOADING TRACK ===\n" << std::endl;
fread(m_name, 1, 29, fp);
m_name[28] = 0;
std::cout << "Track name: " << m_name << std::endl;
fread(&m_type, 1, 1, fp);
fseek(fp, 2, SEEK_CUR);
fread(&m_ordersNum, 2, 1, fp);
fread(&m_instrumentNum, 2, 1, fp);
fread(&m_patternNum, 2, 1, fp);
fread(&m_flags, 2, 1, fp);
fread(&m_cwtv, 2, 1, fp);
fread(&m_ffv, 2, 1, fp);
fread(&m_scrm, 1, 4, fp);
fread(&m_globalVolume, 1, 1, fp);
fread(&m_initialSpeed, 1, 1, fp);
fread(&m_initialTempo, 1, 1, fp);
fread(&m_masterVolume, 1, 1, fp);
fseek(fp, 10, SEEK_CUR);
fread(&m_special, 2, 1, fp);
fread(m_channelSettings, 1, 32, fp);
// sanity check
assert(memcmp(m_scrm, "SCRM", 4) == 0);
assert(m_ordersNum <= 256);
assert(m_instrumentNum <= 99);
assert(m_patternNum <= 100);
// make room for orders and read them from the file pointer initialized before
// also set every order to idle in the beginning
m_orders.resize(m_ordersNum, 255);
fread(static_cast<byte*>(&m_orders[0]), 1, m_ordersNum, fp);
// make room for parapointers and read them from the same file pointer
std::cout << "Total " << m_instrumentNum << " instruments read:\n" << std::endl;
m_instrumentPPs.resize(m_instrumentNum);
m_patternPPs.resize(m_patternNum);
fread(static_cast<uint16_t*>(&m_instrumentPPs[0]), 2, m_instrumentNum, fp);
fread(static_cast<uint16_t*>(&m_patternPPs[0]), 2, m_patternNum, fp);
m_instruments.resize(m_instrumentNum);
// read instruments to memory
for(uint32_t i=0; i < m_instrumentNum; i++)
{
Instrument& ins = m_instruments[i];
fseek(fp, m_instrumentPPs[i] *16 , SEEK_SET);
fread(&ins.type, 1 , 1, fp);
fread(ins.filename, 1, 12, fp);
fread(ins.memSeg, 3, 1, fp);
fread(&ins.length, 2, 1, fp);
fread(&ins.HIleng, 2, 1, fp);
fread(&ins.loopBegin, 2, 1, fp);
fread(&ins.HILbeg, 2, 1, fp);
fread(&ins.loopEnd, 2, 1, fp);
fread(&ins.HILend, 2, 1, fp);
fread(&ins.volume, 1, 1, fp);
fseek(fp, 1, SEEK_CUR);
fread(&ins.packFlag, 1, 1, fp);
fread(&ins.flags, 1, 1, fp);
fread(&ins.c4Speed, 1, 2, fp);
fread(&ins.c4SpeedFactor, 1, 2, fp);
fseek(fp, 12, SEEK_CUR);
fread(ins.name, 1, 28, fp);
fread(ins.scrs, 1, 4, fp);
// bad assertion; not every S3M files have this SCRS included ...
// assert(memcmp(ins.scrs, "SCRS", 4) == 0);
if(ins.type != 1)
{
continue;
}
if(ins.length > 64000)
{
ins.length = 64000;
}
if(ins.flags & 1)
{
assert(ins.loopBegin < ins.length);
assert(ins.loopEnd <= ins.length);
}
if(ins.flags & 2)
{
std::cout << ins.name << "stereo == TRUE" << std::endl;
ins.stereo = true;
uint32_t smppos = ins.memSeg[1]*0x10 + ins.memSeg[2]*0x1000 + ins.memSeg[0]*0x100000;
fseek(fp, smppos, SEEK_SET);
fseek(fp, ins.length, SEEK_CUR);
ins.sampleDataL = new byte[ins.length];
assert(ins.sampleDataL != nullptr);
fread(ins.sampleDataL, 1, ins.length, fp);
ins.sampleDataR = new byte[ins.length];
assert(ins.sampleDataR != nullptr);
fread(ins.sampleDataR, 1, ins.length, fp);
}
else
{
uint32_t smppos = ins.memSeg[1]*0x10 + ins.memSeg[2]*0x1000 + ins.memSeg[0]*0x100000;
fseek(fp, smppos, SEEK_SET);
ins.sampleData = new byte[ins.length];
assert(ins.sampleData != nullptr);
fread(ins.sampleData, 1, ins.length, fp);
}
ins.c4SpeedFactor = (229079296.0 / ins.c4Speed);
std::cout << ins.name << std::endl;
}
m_patternData.resize(m_patternNum);
m_patternEndPtr.resize(m_patternNum);
for(uint32_t i=0; i < m_patternNum; i++)
{
uint16_t length = 2;
fseek(fp, m_patternPPs[i] * 16UL, SEEK_SET);
if(m_patternPPs[i])
{
fread(&length, 1, 2, fp);
}
m_patternData[i].resize(length);
fread(static_cast<byte*>(&m_patternData[i][0]), 1, length-2, fp);
m_patternEndPtr[i] = &m_patternData[i][0] + length-2;
}
fclose(fp);
}
void s3mContainer::playSong()
{
// make channel a class instead of a struct, include the idle base not setting in the constructor of the class
Channel channel[32];
double arpeggioInterval = SamplingRate / 50.0;
double frameDuration = 2.5 * SamplingRate / m_initialTempo;
// here check if ALSA is using STEREO or MONO
//double hertzRatio = 14317056.0 / (double)SamplingRate;
double hertzRatio = 14317056.0 / static_cast<double>(SamplingRate) / 2;
double VolumeNormalizer = (m_masterVolume & 127) * m_globalVolume / 1048576.0;
double currTime = 0.0;
double NoteHzTable[16];
double inverseNoteHzTable[195];
for(int i = 0; i < 195; ++i)
{
inverseNoteHzTable[i] = exp(i * -0.0577622650466621);
}
for(int i = 0; i < 16; ++i)
{
NoteHzTable[i] = exp(i * 0.0577622650466621);
}
uint32_t currentRow = 0;
uint32_t nextOrder = 0;
// loop until the song is complete
while (1)
{
/* Load the pattern pointer */ /* Load the pattern pointer */ /* Load the pattern pointer */
if(nextOrder >= m_ordersNum)
{
nextOrder = 0;
continue;
}
uint32_t currentPattern = m_orders[nextOrder++];
if(currentPattern == 255)
{
nextOrder = 0;
continue;
}
if(currentPattern == 254)
{
continue;
}
const byte* pCurrPattern = static_cast<const byte*>(&m_patternData[currentPattern][0]);
assert(pCurrPattern != nullptr);
/* Skip to the current row */
for(uint32_t rowskip=0; rowskip < currentRow; ++rowskip, ++pCurrPattern)
{
while(*pCurrPattern != 0)
{
readSlot(pCurrPattern);
}
}
const byte* patternLoop = pCurrPattern;
uint32_t loopsRemain = 0;
uint32_t loopRow = 0;
/* Play the pattern until its end */
int rowFinishStyle = 0;
while(pCurrPattern < m_patternEndPtr[currentPattern])
{
uint32_t rowRepeatCount = 0;
for(uint32_t repeat = 0; repeat <= rowRepeatCount; repeat++)
{
for(uint32_t frame = 0; frame < m_initialSpeed; frame++)
{
const byte* rowptr = pCurrPattern;
while( *rowptr != 0)
{
if(m_playerStatusFlags == PLAYER_FLAG_QUIT)
{
return;
}
while(m_playerStatusFlags == PLAYER_FLAG_PAUSE)
{
std::this_thread::sleep_for(std::chrono::milliseconds(200));
}
Slot currSlot = readSlot(rowptr);
Channel& ch = channel[currSlot.channel];
uint32_t noteOnFrame = 0;
uint32_t noteCutFrame = 999;
uint32_t sampleOffset = 0;
uint32_t volumeSlide=0;
uint32_t pitchSlide=0;
uint32_t vibrato=0;
uint32_t portamento=0;
uint32_t arpeggio=0;
switch(currSlot.command + 64) // Parse the command
{
case 'A':
m_initialSpeed = currSlot.info;
break;
case 'B':
rowFinishStyle = 2;
currentRow = 0;
nextOrder = currSlot.info;
break;
case 'C':
rowFinishStyle = 2;
currentRow = (currSlot.info >> 4)*10 + (currSlot.info & 0x0F);
break;
case 'T':
m_initialTempo = currSlot.info;
frameDuration = 2.5* SamplingRate / m_initialTempo;
break;
case 'V':
m_globalVolume = currSlot.info;
VolumeNormalizer = (m_masterVolume & 127) * m_globalVolume / 1048576.0;
break;
case 'U':
currSlot.info |= 0x100;
case 'H':
if(currSlot.info & 0x0F)
{
ch.cacheVibratoLo = currSlot.info & 0x0F;
}
else
{
currSlot.info |= ch.cacheVibratoLo;
}
if(currSlot.info & 0xF0)
{
ch.cacheVibratoHi = currSlot.info & 0xF0;
}
else
{
currSlot.info |= ch.cacheVibratoHi;
}
vibrato = currSlot.info;
break;
case 'R':
if(currSlot.info & 0x0F)
{
ch.cacheVibratoLo = currSlot.info & 0x0F;
}
else
{
currSlot.info |= ch.cacheVibratoLo;
}
if(currSlot.info & 0xF0)
{
ch.cacheTremoloHi = currSlot.info & 0xF0;
}
else
{
currSlot.info |= ch.cacheTremoloHi;
}
break;
case 'O': // Oxx: Set sampledata offset
sampleOffset = currSlot.info * 0x100;
break;
case 'G': // Gxx: Tone portamento
if(!currSlot.info)
{
portamento = ch.cachePortamento;
}
else
{
portamento = ch.cachePortamento = currSlot.info;
}
break;
case 'K': // Kxy: H00 + Dxy
vibrato = ch.cacheVibratoLo | ch.cacheVibratoHi;
goto Dcommand;
case 'L': // Lxy: G00 + Dxy
portamento = ch.cachePortamento;
goto Dcommand;
case 'D': Dcommand: // Dxy: Volume slides
if(!currSlot.info)
{
volumeSlide = ch.cacheVolumeSlide;
}
else
{
volumeSlide = ch.cacheVolumeSlide = currSlot.info;
}
break;
case 'E': // Exy: Pitch slides down
if(!currSlot.info)
{
pitchSlide = ch.cachePitchSlide;
}
else
{
pitchSlide = ch.cachePitchSlide = currSlot.info;
}
break;
case 'F': // Fxy: Pitch slides up
if(!currSlot.info)
{
pitchSlide = ch.cachePitchSlide;
}
else
{
pitchSlide = ch.cachePitchSlide = currSlot.info;
}
pitchSlide |= 0x100;
break;
case 'J': // Jxy: Arpeggio 50Hz { n, n+x, n+y }
if(!currSlot.info)
{
arpeggio = ch.cacheArpeggio;
}
else
{
arpeggio = ch.cacheArpeggio = currSlot.info;
}
ch.arpeggio = arpeggio;
break;
case 'S':
if(frame != 0)
{
break;
}
switch(currSlot.info & 0xF0)
{
case 0xB0: // SBx: Pattern loop
if(currSlot.info == 0xB0)
{
patternLoop = pCurrPattern;
loopRow = currentRow;
}
else if(loopsRemain == 0)
{
rowFinishStyle = 1;
loopsRemain = currSlot.info & 0x0F;
}
else if(--loopsRemain > 0)
{
rowFinishStyle = 1;
}
break;
case 0xC0:
noteCutFrame = currSlot.info & 0x0F;
break;
case 0xD0:
noteOnFrame = currSlot.info & 0x0F;
break;
case 0xE0:
rowRepeatCount = currSlot.info & 0x0F;
break;
}
}
if(frame == noteOnFrame)
{
if(currSlot.note == 254)
{
noteCutFrame = frame;
}
else if(currSlot.note != 255 || currSlot.instrument != 0)
{
if(currSlot.note != 255)
{
ch.baseNote = (currSlot.note >> 4) * 12 + (currSlot.note & 0x0F);
}
if(currSlot.instrument)
{
ch.lastInstrument = currSlot.instrument - 1;
}
if(currSlot.instrument && currSlot.volume == 255)
{
ch.volume = m_instruments[ch.lastInstrument].volume;
}
ch.slideToPeriod = inverseNoteHzTable[ch.baseNote] * m_instruments[ch.lastInstrument].c4SpeedFactor;
if(!portamento)
{
ch.stablePeriod = ch.slideToPeriod;
ch.sampleOffset = sampleOffset;
}
}
if(currSlot.volume != 255)
{
ch.volume = currSlot.volume;
}
}
if(frame == noteCutFrame)
{
ch.baseNote = 255;
}
if(portamento)
{
if(ch.stablePeriod < ch.slideToPeriod)
{
if((ch.stablePeriod += portamento * 4) >= ch.slideToPeriod)
{
ch.stablePeriod = ch.slideToPeriod;
}
}
else if(ch.stablePeriod > ch.slideToPeriod)
{
if((ch.stablePeriod -= portamento * 4) <= ch.slideToPeriod)
{
ch.stablePeriod = ch.slideToPeriod;
}
}
}
ch.livePeriod = ch.stablePeriod;
if(vibrato)
{
ch.vibratoOffset += vibrato >> 4;
uint32_t vibratoStrength = vibrato & 0x0F;
if(vibrato < 0x100)
{
vibratoStrength *= 4;
}
// sin ? cos ? the multiplier is just rnd
double vibratoSkew = sin(ch.vibratoOffset * .0491);
vibratoSkew *= vibratoStrength;
ch.livePeriod = ch.stablePeriod + vibratoSkew;
}
if(pitchSlide)
{
int magnitude = pitchSlide & 0xFF;
int fine = 0;
if(magnitude >= 0xF0)
{
fine = 2;
magnitude &= 0x0F;
}
if(magnitude >= 0xE0)
{
fine = 1;
magnitude &= 0x0F;
}
if(fine < 2)
{
magnitude *=4;
}
if(pitchSlide & 0x100)
{
magnitude = -magnitude;
}
if(!fine || frame == noteOnFrame)
{
ch.livePeriod = ch.stablePeriod += magnitude;
}
}
if(volumeSlide)
{
int trig = (m_cwtv == 0x1300 || (m_flags & 0x40)) || frame >= noteOnFrame;
if((volumeSlide & 0xF0) == 0)
{
if(trig)
{
ch.volume -= volumeSlide & 0x0F;
}
}
else if((volumeSlide & 0x0F) == 0)
{
if(trig)
{
ch.volume += volumeSlide >> 4;
}
}
else if(frame == noteOnFrame)
{
if(volumeSlide & 0xF0)
{
ch.volume -= volumeSlide & 0x0F;
}
else if(volumeSlide & 0x0F)
{
ch.volume += volumeSlide >> 4;
}
}
if(ch.volume < 0)
{
ch.volume = 0;
}
if(ch.volume > 64)
{
ch.volume = 64;
}
}
if(ch.livePeriod != 0.0)
{
ch.liveHz = hertzRatio / ch.livePeriod;
}
} /* end of rowptr loop */
double frameEndsAt = currTime + frameDuration;
uint32_t numSamplesToMix = frameEndsAt - currTime;
static uint32_t mixBuffPos = 0;
for(uint32_t i = 0; i < numSamplesToMix; ++i)
{
double resL = 0.0;
double resR = 0.0;
for(int j = 0; j < 32; ++j)
{
Channel& ch = channel[j];
// sanity check if channel is idle
if(ch.baseNote == 255)
{
continue;
}
const Instrument& ins = m_instruments[ch.lastInstrument];
if(ch.sampleOffset >= ins.length)
{
ch.baseNote = 255;
continue;
}
double currHz = ch.liveHz;
if(ch.arpeggio)
{
uint32_t position = fmod(currTime / arpeggioInterval, 3.0);
currHz *= NoteHzTable[(ch.arpeggio >> (position * 4)) & 0x0F];
}
if(ins.stereo)
{
double tempL = 0.0;
double tempR = 0.0;
if(loadStereoSample(ins, ch.sampleOffset, currHz, tempL, tempR))
{
std::cout << "loaded stereo sample" << std::endl;
resL += ch.volume * tempL;
resR += ch.volume * tempR;
}
}
else
{
resL += ch.volume * loadSample(ins, ch.sampleOffset, currHz);
resR += ch.volume * loadSample(ins, ch.sampleOffset, currHz);
}
}
int normalizedL = resL * VolumeNormalizer;
int normalizedR = resR * VolumeNormalizer;
normalizedL = (normalizedL) < (-128) ? (-128) : (normalizedL);
normalizedL = (normalizedL) > (127) ? (127) : (normalizedL);
normalizedR = (normalizedR) < (-128) ? (-128) : (normalizedR);
normalizedR = (normalizedR) > (127) ? (127) : (normalizedR);
m_audioBufferVector[mixBuffPos*2] = normalizedL + 128;
m_audioBufferVector[mixBuffPos*2+1] = normalizedR + 128;
mixBuffPos++;
if(mixBuffPos >= m_audioBufferSize/2)
{
m_player.writeAudio(static_cast<byte*>(&m_audioBufferVector[0]), m_audioBufferSize/2);
mixBuffPos = 0;
periodic++;
}
currTime += 1.0;
}
} // end of frame loop
}
if(rowFinishStyle == 1)
{
pCurrPattern = patternLoop;
currentRow = loopRow;
continue;
}
if(rowFinishStyle == 2)
{
break;
}
while(*pCurrPattern != 0)
{
readSlot(pCurrPattern);
}
pCurrPattern++;
currentRow++;
} // end of pCurrPattern loop
if(rowFinishStyle == 0)
{
currentRow = 0;
}
} // end of while
}
void s3mContainer::requestQuit()
{
m_playerStatusFlags = PLAYER_FLAG_QUIT;
}
void s3mContainer::pause()
{
m_playerStatusFlags = PLAYER_FLAG_PAUSE;
}
void s3mContainer::resume()
{
m_playerStatusFlags = 0x0;
}