/*
 * Sndfile.h
 * ---------
 * Purpose: Core class of the playback engine. Every song is represented by a CSoundFile object.
 * Notes  : (currently none)
 * Authors: Olivier Lapicque
 *          OpenMPT Devs
 * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
 */


#pragma once

#include "SoundFilePlayConfig.h"
#include "MixerSettings.h"
#include "../common/misc_util.h"
#include "../common/mptRandom.h"
#include <vector>
#include <bitset>
#include <set>
#include "Snd_defs.h"
#include "tuning.h"
#include "MIDIMacros.h"
#ifdef MODPLUG_TRACKER
#include "../mptrack/MIDIMapping.h"
#endif // MODPLUG_TRACKER

#include "Mixer.h"
#include "Resampler.h"
#ifndef NO_REVERB
#include "../sounddsp/Reverb.h"
#endif
#ifndef NO_AGC
#include "../sounddsp/AGC.h"
#endif
#ifndef NO_DSP
#include "../sounddsp/DSP.h"
#endif
#ifndef NO_EQ
#include "../sounddsp/EQ.h"
#endif

#include "modcommand.h"
#include "ModSample.h"
#include "ModInstrument.h"
#include "ModChannel.h"
#include "plugins/PluginStructs.h"
#include "RowVisitor.h"
#include "Message.h"
#include "pattern.h"
#include "patternContainer.h"
#include "ModSequence.h"


OPENMPT_NAMESPACE_BEGIN


class FileReader;
// -----------------------------------------------------------------------------
// MODULAR ModInstrument FIELD ACCESS : body content in InstrumentExtensions.cpp
// -----------------------------------------------------------------------------
#ifndef MODPLUG_NO_FILESAVE
void WriteInstrumentHeaderStructOrField(ModInstrument * input, FILE * file, uint32 only_this_code = -1 /* -1 for all */, uint16 fixedsize = 0);
#endif // !MODPLUG_NO_FILESAVE
bool ReadInstrumentHeaderField(ModInstrument * input, uint32 fcode, uint16 fsize, FileReader &file);
// --------------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------------

typedef void (* LPSNDMIXHOOKPROC)(int *, unsigned long, unsigned long); // buffer, samples, channels


#ifdef LIBOPENMPT_BUILD
#ifndef NO_PLUGINS
class CVstPluginManager;
#endif
#endif


typedef std::bitset<kMaxPlayBehaviours> PlayBehaviourSet;

#ifdef MODPLUG_TRACKER

// For WAV export (writing pattern positions to file)
struct PatternCuePoint
{
	uint64     offset;			// offset in the file (in samples)
	ORDERINDEX order;			// which order is this?
	bool       processed;		// has this point been processed by the main WAV render function yet?
};

#endif // MODPLUG_TRACKER


// Return values for GetLength()
struct GetLengthType
{
	double duration;		// total time in seconds
	ROWINDEX lastRow;		// last parsed row (if no target is specified, this is the first row that is parsed twice, i.e. not the *last* played order)
	ROWINDEX endRow;		// last row before module loops (UNDEFINED if a target is specified)
	ROWINDEX startRow;		// first row of parsed subsong
	ORDERINDEX lastOrder;	// last parsed order (see lastRow remark)
	ORDERINDEX endOrder;	// last order before module loops (UNDEFINED if a target is specified)
	ORDERINDEX startOrder;	// first order of parsed subsong
	bool targetReached;		// true if the specified order/row combination or duration has been reached while going through the module

	GetLengthType()
		: duration(0.0)
		, lastRow(ROWINDEX_INVALID), endRow(ROWINDEX_INVALID), startRow(0)
		, lastOrder(ORDERINDEX_INVALID), endOrder(ORDERINDEX_INVALID), startOrder(0)
		, targetReached(false) { }
};


// Target seek mode for GetLength()
struct GetLengthTarget
{
	ROWINDEX startRow;
	ORDERINDEX startOrder;
	SEQUENCEINDEX sequence;

	union
	{
		double time;
		struct
		{
			ROWINDEX row;
			ORDERINDEX order;
		} pos;
	};

	enum Mode
	{
		NoTarget,		// Don't seek, i.e. return complete length of the first subsong.
		GetAllSubsongs,	// Same as NoTarget (i.e. get complete length), but returns the length of all sub songs
		SeekPosition,	// Seek to given pattern position.
		SeekSeconds,	// Seek to given time.
	} mode;

	// Don't seek, i.e. return complete module length.
	GetLengthTarget(bool allSongs = false)
	{
		mode = allSongs ? GetAllSubsongs : NoTarget;
		sequence = SEQUENCEINDEX_INVALID;
		startOrder = 0;
		startRow = 0;
	}

	// Seek to given pattern position if position is valid.
	GetLengthTarget(ORDERINDEX order, ROWINDEX row)
	{
		mode = NoTarget;
		sequence = SEQUENCEINDEX_INVALID;
		startOrder = 0;
		startRow = 0;
		if(order != ORDERINDEX_INVALID && row != ROWINDEX_INVALID)
		{
			mode = SeekPosition;
			pos.row = row;
			pos.order = order;
		}
	}

	// Seek to given time if t is valid (i.e. not negative).
	GetLengthTarget(double t)
	{
		mode = NoTarget;
		sequence = SEQUENCEINDEX_INVALID;
		startOrder = 0;
		startRow = 0;
		if(t >= 0.0)
		{
			mode = SeekSeconds;
			time = t;
		}
	}

	// Set start position from which seeking should begin.
	GetLengthTarget &StartPos(SEQUENCEINDEX seq, ORDERINDEX order, ROWINDEX row)
	{
		sequence = seq;
		startOrder = order;
		startRow = row;
		return *this;
	}
};


// Reset mode for GetLength()
enum enmGetLengthResetMode
{
	// Never adjust global variables / mod parameters
	eNoAdjust			= 0x00,
	// Mod parameters (such as global volume, speed, tempo, etc...) will always be memorized if the target was reached (i.e. they won't be reset to the previous values).  If target couldn't be reached, they are reset to their default values.
	eAdjust				= 0x01,
	// Same as above, but global variables will only be memorized if the target could be reached. This does *NOT* influence the visited rows vector - it will *ALWAYS* be adjusted in this mode.
	eAdjustOnSuccess	= 0x02 | eAdjust,
	// Same as previous option, but will also try to emulate sample playback so that voices from previous patterns will sound when continuing playback at the target position.
	eAdjustSamplePositions = 0x04 | eAdjustOnSuccess,
};


// Delete samples assigned to instrument
enum deleteInstrumentSamples
{
	deleteAssociatedSamples,
	doNoDeleteAssociatedSamples,
};


class CTuningCollection;
struct CModSpecifications;
#ifdef MODPLUG_TRACKER
class CModDoc;
#endif // MODPLUG_TRACKER


/////////////////////////////////////////////////////////////////////////
// File edit history

#define HISTORY_TIMER_PRECISION	18.2f

//================
struct FileHistory
//================
{
	// Date when the file was loaded in the the tracker or created.
	tm loadDate;
	// Time the file was open in the editor, in 1/18.2th seconds (frequency of a standard DOS timer, to keep compatibility with Impulse Tracker easy).
	uint32 openTime;
	// Return the date as a (possibly truncated if not enough precision is available) ISO 8601 formatted date.
	mpt::ustring AsISO8601() const;
};


struct TimingInfo
{
	double InputLatency; // seconds
	double OutputLatency; // seconds
	int64 StreamFrames;
	uint64 SystemTimestamp; // nanoseconds
	double Speed;
	TimingInfo()
		: InputLatency(0.0)
		, OutputLatency(0.0)
		, StreamFrames(0)
		, SystemTimestamp(0)
		, Speed(1.0)
	{
		return;
	}
};


class IAudioReadTarget
{
protected:
	virtual ~IAudioReadTarget() { }
public:
	virtual void DataCallback(int *MixSoundBuffer, std::size_t channels, std::size_t countChunk) = 0;
};


//==============
class CSoundFile
//==============
{
	friend class GetLengthMemory;

public: //Misc
#ifdef MODPLUG_TRACKER
	void ChangeModTypeTo(const MODTYPE& newType);
#endif // MODPLUG_TRACKER

	// Returns value in seconds. If given position won't be played at all, returns -1.
	// If updateVars is true, the state of various playback variables will be updated according to the playback position.
	// If updateSamplePos is also true, the sample positions of samples still playing from previous patterns will be kept in sync.
	double GetPlaybackTimeAt(ORDERINDEX ord, ROWINDEX row, bool updateVars, bool updateSamplePos);

	//Tuning-->
public:
#ifdef MODPLUG_TRACKER
	static bool LoadStaticTunings();
	bool SaveStaticTunings();
	static void DeleteStaticdata();
	static CTuningCollection& GetLocalTunings() {return *s_pTuningsSharedLocal;}
#endif
	void LoadBuiltInTunings();
	void UnloadBuiltInTunings();
	CTuningCollection& GetBuiltInTunings() {return *m_pTuningsBuiltIn;}
	static CTuning *GetDefaultTuning() {return nullptr;}
	CTuningCollection& GetTuneSpecificTunings() {return *m_pTuningsTuneSpecific;}

	std::string GetNoteName(const ModCommand::NOTE note, const INSTRUMENTINDEX inst) const;
	static std::string GetNoteName(const ModCommand::NOTE note);
#ifdef MODPLUG_TRACKER
	static const char (*m_NoteNames)[4];
	static void SetDefaultNoteNames();
#endif

private:
	CTuningCollection* m_pTuningsTuneSpecific;
#ifdef MODPLUG_TRACKER
	static CTuningCollection* s_pTuningsSharedLocal;
#endif
	CTuningCollection* m_pTuningsBuiltIn;
	//<--Tuning

#ifdef MODPLUG_TRACKER
public:
	CMIDIMapper& GetMIDIMapper() {return m_MIDIMapper;}
	const CMIDIMapper& GetMIDIMapper() const {return m_MIDIMapper;}
private:
	CMIDIMapper m_MIDIMapper;

#endif // MODPLUG_TRACKER

private: //Misc private methods.
	static void SetModSpecsPointer(const CModSpecifications*& pModSpecs, const MODTYPE type);

private: //Misc data
	const CModSpecifications *m_pModSpecs;

private:
	// Interleaved Front Mix Buffer (Also room for interleaved rear mix)
	mixsample_t MixSoundBuffer[MIXBUFFERSIZE * 4];
	mixsample_t MixRearBuffer[MIXBUFFERSIZE * 2];
	// Non-interleaved plugin processing buffer
	float MixFloatBuffer[2][MIXBUFFERSIZE];
	mixsample_t gnDryLOfsVol;
	mixsample_t gnDryROfsVol;

public:
	MixerSettings m_MixerSettings;
	CResampler m_Resampler;
#ifndef NO_REVERB
	CReverb m_Reverb;
#endif
#ifndef NO_DSP
	CSurround m_Surround;
	CMegaBass m_MegaBass;
#endif
#ifndef NO_EQ
	CQuadEQ m_EQ;
#endif
#ifndef NO_AGC
	CAGC m_AGC;
#endif

	typedef uint32 samplecount_t;	// Number of rendered samples

public:	// for Editing
#ifdef MODPLUG_TRACKER
	CModDoc *m_pModDoc;		// Can be a null pointer for example when previewing samples from the treeview.
#endif // MODPLUG_TRACKER
	Enum<MODTYPE> m_nType;
private:
	MODCONTAINERTYPE m_ContainerType;
public:
	CHANNELINDEX m_nChannels;
	SAMPLEINDEX m_nSamples;
	INSTRUMENTINDEX m_nInstruments;
	uint32 m_nDefaultSpeed, m_nDefaultGlobalVolume;
	TEMPO m_nDefaultTempo;
	FlagSet<SongFlags> m_SongFlags;
	CHANNELINDEX m_nMixChannels;
private:
	CHANNELINDEX m_nMixStat;
public:
	ROWINDEX m_nDefaultRowsPerBeat, m_nDefaultRowsPerMeasure;	// default rows per beat and measure for this module
	TempoMode m_nTempoMode;

#ifdef MODPLUG_TRACKER
	// Lock playback between two orders. Lock is active if lock start != ORDERINDEX_INVALID).
	ORDERINDEX m_lockOrderStart, m_lockOrderEnd;
#endif // MODPLUG_TRACKER

	uint32 m_nSamplePreAmp, m_nVSTiVolume;
	bool IsGlobalVolumeUnset() const { return IsFirstTick(); }
#ifndef MODPLUG_TRACKER
	uint32 m_nFreqFactor; // Pitch shift factor (65536 = no pitch shifting). Only used in libopenmpt (openmpt::ext::interactive::set_pitch_factor)
	uint32 m_nTempoFactor; // Tempo factor (65536 = no tempo adjustment). Only used in libopenmpt (openmpt::ext::interactive::set_tempo_factor)
#endif

	// Row swing factors for modern tempo mode
	TempoSwing m_tempoSwing;

	// Min Period = highest possible frequency, Max Period = lowest possible frequency for current format
	// Note: Period is an Amiga metric that is inverse to frequency.
	// Periods in MPT are 4 times as fine as Amiga periods because of extra fine frequency slides (introduced in the S3M format).
	int32 m_nMinPeriod, m_nMaxPeriod;

	ResamplingMode m_nResampling;	// Resampling mode (if overriding the globally set resampling)
	int32 m_nRepeatCount;	// -1 means repeat infinitely.
	ORDERINDEX m_nMaxOrderPosition;
	ModChannelSettings ChnSettings[MAX_BASECHANNELS];	// Initial channels settings
	CPatternContainer Patterns;							// Patterns
	ModSequenceSet Order;								// Modsequences. Order[x] returns an index of a pattern located at order x of the current sequence.
protected:
	ModSample Samples[MAX_SAMPLES];						// Sample Headers
public:
	ModInstrument *Instruments[MAX_INSTRUMENTS];		// Instrument Headers
	MIDIMacroConfig m_MidiCfg;							// MIDI Macro config table
#ifndef NO_PLUGINS
	SNDMIXPLUGIN m_MixPlugins[MAX_MIXPLUGINS];			// Mix plugins
#endif
	char m_szNames[MAX_SAMPLES][MAX_SAMPLENAME];		// Sample names

	uint32 m_dwCreatedWithVersion;
	uint32 m_dwLastSavedWithVersion;

	PlayBehaviourSet m_playBehaviour;

protected:

	mpt::fast_prng m_PRNG;
	inline mpt::fast_prng & AccessPRNG() const { return const_cast<CSoundFile*>(this)->m_PRNG; }
	inline mpt::fast_prng & AccessPRNG() { return m_PRNG; }

protected:
	// Mix level stuff
	CSoundFilePlayConfig m_PlayConfig;
	MixLevels m_nMixLevels;

public:
	struct PlayState
	{
		friend class CSoundFile;
	protected:
		samplecount_t m_nBufferCount;
		double m_dBufferDiff;
	public:
		samplecount_t m_lTotalSampleCount;

	public:
		uint32 m_nTickCount;
	protected:
		uint32 m_nPatternDelay, m_nFrameDelay;	// m_nPatternDelay = pattern delay (rows), m_nFrameDelay = fine pattern delay (ticks)
		uint32 m_nSamplesPerTick;
	public:
		ROWINDEX m_nCurrentRowsPerBeat, m_nCurrentRowsPerMeasure;	// current rows per beat and measure for this module
		uint32 m_nMusicSpeed;	// Current speed
		TEMPO m_nMusicTempo;	// Current tempo

		// Playback position
		ROWINDEX m_nRow;
		ROWINDEX m_nNextRow;
	protected:
		ROWINDEX m_nNextPatStartRow; // for FT2's E60 bug
	public:
		PATTERNINDEX m_nPattern;
		ORDERINDEX m_nCurrentOrder, m_nNextOrder, m_nSeqOverride;

		// Global volume
	public:
		int32 m_nGlobalVolume;
	protected:
		int32 m_nSamplesToGlobalVolRampDest, m_nGlobalVolumeRampAmount,
			m_nGlobalVolumeDestination;
		int32 m_lHighResRampingGlobalVolume;

	public:
		bool m_bPositionChanged;		// Report to plugins that we jumped around in the module

	public:
		CHANNELINDEX ChnMix[MAX_CHANNELS];					// Channels to be mixed
		ModChannel Chn[MAX_CHANNELS];						// Mixing channels... First m_nChannel channels are master channels (i.e. they are never NNA channels)!

	protected:
		bool m_bPatternTransitionOccurred;

	public:
		PlayState &operator= (const PlayState &other) { memcpy(this, &other, sizeof(PlayState)); return *this; }
	};

	PlayState m_PlayState;
protected:
	// For handling backwards jumps and stuff to prevent infinite loops when counting the mod length or rendering to wav.
	RowVisitor visitedSongRows;

public:
#ifdef MODPLUG_TRACKER
	std::bitset<MAX_BASECHANNELS> m_bChannelMuteTogglePending;

	std::vector<PatternCuePoint> m_PatternCuePoints;	// For WAV export (writing pattern positions to file)
#endif // MODPLUG_TRACKER

public:
#ifdef LIBOPENMPT_BUILD
#ifndef NO_PLUGINS
	MPT_SHARED_PTR<CVstPluginManager> m_PluginManager;
#endif
#endif

public:

	std::string m_songName;
	mpt::ustring m_songArtist;

	// Song message
	SongMessage m_songMessage;
	std::string m_madeWithTracker;

protected:
	std::vector<FileHistory> m_FileHistory;	// File edit history
public:
	std::vector<FileHistory> &GetFileHistory() { return m_FileHistory; }
	const std::vector<FileHistory> &GetFileHistory() const { return m_FileHistory; }

#ifdef MPT_EXTERNAL_SAMPLES
	// MPTM external on-disk sample paths
protected:
	std::vector<mpt::PathString> m_samplePaths;

public:
	void SetSamplePath(SAMPLEINDEX smp, const mpt::PathString &filename) { if(m_samplePaths.size() < smp) m_samplePaths.resize(smp); m_samplePaths[smp - 1] = filename; }
	void ResetSamplePath(SAMPLEINDEX smp) { if(m_samplePaths.size() >= smp) m_samplePaths[smp - 1] = mpt::PathString(); Samples[smp].uFlags.reset(SMP_KEEPONDISK | SMP_MODIFIED);}
	mpt::PathString GetSamplePath(SAMPLEINDEX smp) const { if(m_samplePaths.size() >= smp) return m_samplePaths[smp - 1]; else return mpt::PathString(); }
	bool SampleHasPath(SAMPLEINDEX smp) const { if(m_samplePaths.size() >= smp) return !m_samplePaths[smp - 1].empty(); else return false; }
	bool IsExternalSampleMissing(SAMPLEINDEX smp) const { return Samples[smp].uFlags[SMP_KEEPONDISK] && Samples[smp].pSample == nullptr; }

	bool LoadExternalSample(SAMPLEINDEX smp, const mpt::PathString &filename);
#endif // MPT_EXTERNAL_SAMPLES

	bool m_bIsRendering;
	TimingInfo m_TimingInfo; // only valid if !m_bIsRendering

private:
	// logging
	ILog *m_pCustomLog;

public:
	CSoundFile();
	~CSoundFile();

public:
	// logging
	void SetCustomLog(ILog *pLog) { m_pCustomLog = pLog; }
	void AddToLog(LogLevel level, const mpt::ustring &text) const;
	/*MPT_DEPRECATED*/ void AddToLog(const AnyStringLocale &text) const { AddToLog(LogInformation, mpt::ToUnicode(text)); }

public:

	enum ModLoadingFlags
	{
		onlyVerifyHeader	= 0x00,
		loadPatternData		= 0x01,	// If unset, advise loaders to not process any pattern data (if possible)
		loadSampleData		= 0x02,	// If unset, advise loaders to not process any sample data (if possible)
		loadPluginData		= 0x04,	// If unset, plugins are not instanciated.
		// Shortcuts
		loadCompleteModule	= loadSampleData | loadPatternData | loadPluginData,
		loadNoPatternOrPluginData	= loadSampleData,
	};

#ifdef MODPLUG_TRACKER
	// Get parent CModDoc. Can be nullptr if previewing from tree view, and is always nullptr if we're not actually compiling OpenMPT.
	CModDoc *GetpModDoc() const { return m_pModDoc; }

	bool Create(FileReader file, ModLoadingFlags loadFlags = loadCompleteModule, CModDoc *pModDoc = nullptr);
#else
	bool Create(FileReader file, ModLoadingFlags loadFlags);
#endif // MODPLUG_TRACKER

	bool Destroy();
	Enum<MODTYPE> GetType() const { return m_nType; }

	MODCONTAINERTYPE GetContainerType() const { return m_ContainerType; }

	// rough heuristic, could be improved
	mpt::Charset GetCharset() const { return GetCharsetFromModType(GetType()); }
	mpt::Charset GetCharsetLocaleOrModule() const
	{
		#if defined(MODPLUG_TRACKER)
			return mpt::CharsetLocale;
		#else // MODPLUG_TRACKER
			return GetCharset();
		#endif // MODPLUG_TRACKER
	}

	void SetPreAmp(uint32 vol);
	uint32 GetPreAmp() const { return m_MixerSettings.m_nPreAmp; }

	void SetMixLevels(MixLevels levels);
	MixLevels GetMixLevels() const { return m_nMixLevels; }
	const CSoundFilePlayConfig &GetPlayConfig() const { return m_PlayConfig; }

	INSTRUMENTINDEX GetNumInstruments() const { return m_nInstruments; }
	SAMPLEINDEX GetNumSamples() const { return m_nSamples; }
	PATTERNINDEX GetCurrentPattern() const { return m_PlayState.m_nPattern; }
	ORDERINDEX GetCurrentOrder() const { return m_PlayState.m_nCurrentOrder; }
	CHANNELINDEX GetNumChannels() const { return m_nChannels; }

#ifndef NO_PLUGINS
	IMixPlugin* GetInstrumentPlugin(INSTRUMENTINDEX instr);
#endif
	const CModSpecifications& GetModSpecifications() const {return *m_pModSpecs;}
	static const CModSpecifications& GetModSpecifications(const MODTYPE type);

#ifdef MODPLUG_TRACKER
	void PatternTranstionChnSolo(const CHANNELINDEX chnIndex);
	void PatternTransitionChnUnmuteAll();
#endif // MODPLUG_TRACKER

	double GetCurrentBPM() const;
	void DontLoopPattern(PATTERNINDEX nPat, ROWINDEX nRow = 0);		//rewbs.playSongFromCursor
	CHANNELINDEX GetMixStat() const { return m_nMixStat; }
	void ResetMixStat() { m_nMixStat = 0; }
	void ResetPlayPos();
	void SetCurrentOrder(ORDERINDEX nOrder);
	std::string GetTitle() const { return m_songName; }
	bool SetTitle(const std::string &newTitle); // Return true if title was changed.
	const char *GetSampleName(SAMPLEINDEX nSample) const;
	const char *GetInstrumentName(INSTRUMENTINDEX nInstr) const;
	uint32 GetMusicSpeed() const { return m_PlayState.m_nMusicSpeed; }
	TEMPO GetMusicTempo() const { return m_PlayState.m_nMusicTempo; }
	bool IsFirstTick() const { return (m_PlayState.m_lTotalSampleCount == 0); }

	//Get modlength in various cases: total length, length to
	//specific order&row etc. Return value is in seconds.
	std::vector<GetLengthType> GetLength(enmGetLengthResetMode adjustMode, GetLengthTarget target = GetLengthTarget());

	void InitializeVisitedRows() { visitedSongRows.Initialize(true); }

public:
	//Returns song length in seconds.
	double GetSongTime() { return GetLength(eNoAdjust).back().duration; }

	void RecalculateSamplesPerTick();
	double GetRowDuration(TEMPO tempo, uint32 speed) const;
	uint32 GetTickDuration(PlayState &playState) const;

	// A repeat count value of -1 means infinite loop
	void SetRepeatCount(int n) { m_nRepeatCount = n; }
	int GetRepeatCount() const { return m_nRepeatCount; }
	bool IsPaused() const {	return m_SongFlags[SONG_PAUSED | SONG_STEP]; }	// Added SONG_STEP as it seems to be desirable in most cases to check for this as well.
	void LoopPattern(PATTERNINDEX nPat, ROWINDEX nRow = 0);

	bool InitChannel(CHANNELINDEX nChn);

	// Module Loaders
	bool ReadXM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadS3M(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadMod(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadM15(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadICE(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadPT36(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadMed(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadMTM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadSTM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadIT(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadITProject(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool Read669(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadUlt(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadWav(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadDSM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadFAR(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadAMS(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadAMS2(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadMDL(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadOKT(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadDMF(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadPTM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadDBM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadAMF_Asylum(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadAMF_DSMI(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadMT2(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadPSM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadPSM16(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadUMX(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadMO3(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadGDM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadIMF(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadAM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadJ2B(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadDIGI(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadPLM(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadMID(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);
	bool ReadSFX(FileReader &file, ModLoadingFlags loadFlags = loadCompleteModule);

	static std::vector<const char *> GetSupportedExtensions(bool otherFormats);
	static mpt::Charset GetCharsetFromModType(MODTYPE modtype);
	static const char * ModTypeToString(MODTYPE modtype);
	static std::string ModContainerTypeToString(MODCONTAINERTYPE containertype);
	static std::string ModTypeToTracker(MODTYPE modtype);
	static std::string ModContainerTypeToTracker(MODCONTAINERTYPE containertype);

	void UpgradeModule();

	// Save Functions
#ifndef MODPLUG_NO_FILESAVE
	bool SaveXM(const mpt::PathString &filename, bool compatibilityExport = false);
	bool SaveS3M(const mpt::PathString &filename) const;
	bool SaveMod(const mpt::PathString &filename) const;
	bool SaveIT(const mpt::PathString &filename, bool compatibilityExport = false);
	uint32 SaveMixPlugins(FILE *f=NULL, bool bUpdate=true);
	void WriteInstrumentPropertyForAllInstruments(uint32 code,  uint16 size, FILE* f, INSTRUMENTINDEX nInstruments) const;
	void SaveExtendedInstrumentProperties(INSTRUMENTINDEX nInstruments, FILE* f) const;
	void SaveExtendedSongProperties(FILE* f) const;
#endif // MODPLUG_NO_FILESAVE
	void LoadExtendedSongProperties(FileReader &file, bool ignoreChannelCount, bool* pInterpretMptMade = nullptr);
	void LoadMPTMProperties(FileReader &file, uint16 cwtv);

	std::string GetSchismTrackerVersion(uint16 cwtv);

	// Reads extended instrument properties(XM/IT/MPTM).
	// If no errors occur and song extension tag is found, returns pointer to the beginning
	// of the tag, else returns NULL.
	void LoadExtendedInstrumentProperties(FileReader &file, bool *pInterpretMptMade = nullptr);

	void SetDefaultPlaybackBehaviour(MODTYPE type);
	static PlayBehaviourSet GetSupportedPlaybackBehaviour(MODTYPE type);
	static PlayBehaviourSet GetDefaultPlaybackBehaviour(MODTYPE type);

	// MOD Convert function
	MODTYPE GetBestSaveFormat() const;
	static void ConvertModCommand(ModCommand &m);
	static void S3MConvert(ModCommand &m, bool fromIT);
	void S3MSaveConvert(uint8 &command, uint8 &param, bool toIT, bool compatibilityExport = false) const;
	void ModSaveCommand(uint8 &command, uint8 &param, const bool toXM, const bool compatibilityExport = false) const;
	static void ReadMODPatternEntry(FileReader &file, ModCommand &m);
	static void ReadMODPatternEntry(const uint8 (&data)[4], ModCommand &m);

	void SetupMODPanning(bool bForceSetup = false); // Setup LRRL panning, max channel volume

public:
	// Real-time sound functions
	void SuspendPlugins();
	void ResumePlugins();
	void StopAllVsti();
	void RecalculateGainForAllPlugs();
	void ResetChannels();
	samplecount_t Read(samplecount_t count, IAudioReadTarget &target);
private:
	void CreateStereoMix(int count);
public:
	bool FadeSong(uint32 msec);
private:
	void ProcessDSP(std::size_t countChunk);
	void ProcessPlugins(uint32 nCount);
public:
	samplecount_t GetTotalSampleCount() const { return m_PlayState.m_lTotalSampleCount; }
	bool HasPositionChanged() { bool b = m_PlayState.m_bPositionChanged; m_PlayState.m_bPositionChanged = false; return b; }
	bool IsRenderingToDisc() const { return m_bIsRendering; }

	void PrecomputeSampleLoops(bool updateChannels = false);

public:
	// Mixer Config
	void SetMixerSettings(const MixerSettings &mixersettings);
	void SetResamplerSettings(const CResamplerSettings &resamplersettings);
	void InitPlayer(bool bReset=false);
	void SetDspEffects(uint32 DSPMask);
	uint32 GetSampleRate() const { return m_MixerSettings.gdwMixingFreq; }
#ifndef NO_EQ
	void SetEQGains(const uint32 *pGains, uint32 nBands, const uint32 *pFreqs=NULL, bool bReset=false)	{ m_EQ.SetEQGains(pGains, nBands, pFreqs, bReset, m_MixerSettings.gdwMixingFreq); } // 0=-12dB, 32=+12dB
#endif // NO_EQ
public:
	bool ReadNote();
	bool ProcessRow();
	bool ProcessEffects();
	CHANNELINDEX GetNNAChannel(CHANNELINDEX nChn) const;
	CHANNELINDEX CheckNNA(CHANNELINDEX nChn, uint32 instr, int note, bool forceCut);
	void NoteChange(ModChannel *pChn, int note, bool bPorta = false, bool bResetEnv = true, bool bManual = false) const;
	void InstrumentChange(ModChannel *pChn, uint32 instr, bool bPorta = false, bool bUpdVol = true, bool bResetEnv = true) const;
	void ApplyInstrumentPanning(ModChannel *pChn, const ModInstrument *instr, const ModSample *smp) const;
	uint32 CalculateXParam(PATTERNINDEX pat, ROWINDEX row, CHANNELINDEX chn, bool *isExtended = nullptr) const;

	// Channel Effects
	void KeyOff(ModChannel *pChn) const;
	// Global Effects
	void SetTempo(TEMPO param, bool setAsNonModcommand = false);
	void SetSpeed(uint32 param);

protected:
	// Global variable initializer for loader functions
	void SetType(MODTYPE type);
	void InitializeGlobals(MODTYPE type = MOD_TYPE_NONE);
	void InitializeChannels();

	// Channel effect processing
	int GetVibratoDelta(int type, int position) const;

	void ProcessVolumeSwing(ModChannel *pChn, int &vol) const;
	void ProcessPanningSwing(ModChannel *pChn) const;
	void ProcessTremolo(ModChannel *pChn, int &vol) const;
	void ProcessTremor(CHANNELINDEX nChn, int &vol);

	bool IsEnvelopeProcessed(const ModChannel *pChn, EnvelopeType env) const;
	void ProcessVolumeEnvelope(ModChannel *pChn, int &vol) const;
	void ProcessPanningEnvelope(ModChannel *pChn) const;
	void ProcessPitchFilterEnvelope(ModChannel *pChn, int &period) const;

	void IncrementEnvelopePosition(ModChannel *pChn, EnvelopeType envType) const;
	void IncrementEnvelopePositions(ModChannel *pChn) const;

	void ProcessInstrumentFade(ModChannel *pChn, int &vol) const;

	void ProcessPitchPanSeparation(ModChannel *pChn) const;
	void ProcessPanbrello(ModChannel *pChn) const;

	void ProcessArpeggio(CHANNELINDEX nChn, int &period, CTuning::NOTEINDEXTYPE &arpeggioSteps);
	void ProcessVibrato(CHANNELINDEX nChn, int &period, CTuning::RATIOTYPE &vibratoFactor);
	void ProcessSampleAutoVibrato(ModChannel *pChn, int &period, CTuning::RATIOTYPE &vibratoFactor, int &nPeriodFrac) const;

	void ProcessRamping(ModChannel *pChn) const;

	uint32 GetChannelIncrement(ModChannel *pChn, uint32 period, int periodFrac) const;

protected:
	// Type of panning command
	enum PanningType
	{
		Pan4bit = 4,
		Pan6bit = 6,
		Pan8bit = 8,
	};
	// Channel Effects
	void UpdateS3MEffectMemory(ModChannel *pChn, ModCommand::PARAM param) const;
	void PortamentoUp(CHANNELINDEX nChn, ModCommand::PARAM param, const bool doFinePortamentoAsRegular = false);
	void PortamentoDown(CHANNELINDEX nChn, ModCommand::PARAM param, const bool doFinePortamentoAsRegular = false);
	void MidiPortamento(CHANNELINDEX nChn, int param, bool doFineSlides);
	void FinePortamentoUp(ModChannel *pChn, ModCommand::PARAM param) const;
	void FinePortamentoDown(ModChannel *pChn, ModCommand::PARAM param) const;
	void ExtraFinePortamentoUp(ModChannel *pChn, ModCommand::PARAM param) const;
	void ExtraFinePortamentoDown(ModChannel *pChn, ModCommand::PARAM param) const;
	void PortamentoMPT(ModChannel*, int);
	void PortamentoFineMPT(ModChannel*, int);
	void PortamentoExtraFineMPT(ModChannel*, int);
	void NoteSlide(ModChannel *pChn, uint32 param, bool slideUp, bool retrig) const;
	void TonePortamento(ModChannel *pChn, uint32 param) const;
	void Vibrato(ModChannel *pChn, uint32 param) const;
	void FineVibrato(ModChannel *pChn, uint32 param) const;
	void VolumeSlide(ModChannel *pChn, ModCommand::PARAM param);
	void PanningSlide(ModChannel *pChn, ModCommand::PARAM param, bool memory = true);
	void ChannelVolSlide(ModChannel *pChn, ModCommand::PARAM param) const;
	void FineVolumeUp(ModChannel *pChn, ModCommand::PARAM param, bool volCol) const;
	void FineVolumeDown(ModChannel *pChn, ModCommand::PARAM param, bool volCol) const;
	void Tremolo(ModChannel *pChn, uint32 param) const;
	void Panbrello(ModChannel *pChn, uint32 param) const;
	void Panning(ModChannel *pChn, uint32 param, PanningType panBits) const;
	void RetrigNote(CHANNELINDEX nChn, int param, int offset = 0);
	void SampleOffset(ModChannel &chn, SmpLength param) const;
	void ReverseSampleOffset(ModChannel &chn, ModCommand::PARAM param) const;
	void NoteCut(CHANNELINDEX nChn, uint32 nTick, bool cutSample);
	ROWINDEX PatternLoop(ModChannel *, uint32 param);
	void ExtendedMODCommands(CHANNELINDEX nChn, ModCommand::PARAM param);
	void ExtendedS3MCommands(CHANNELINDEX nChn, ModCommand::PARAM param);
	void ExtendedChannelEffect(ModChannel *, uint32 param);
	void InvertLoop(ModChannel* pChn);
	ROWINDEX PatternBreak(PlayState &state, CHANNELINDEX chn, uint8 param) const;
	void GlobalVolSlide(ModCommand::PARAM param, uint8 &nOldGlobalVolSlide);

	void ProcessMacroOnChannel(CHANNELINDEX nChn);
	void ProcessMIDIMacro(CHANNELINDEX nChn, bool isSmooth, const char *macro, uint8 param = 0, PLUGINDEX plugin = 0);
	float CalculateSmoothParamChange(float currentValue, float param) const;
	uint32 SendMIDIData(CHANNELINDEX nChn, bool isSmooth, const unsigned char *macro, uint32 macroLen, PLUGINDEX plugin);
	void SendMIDINote(CHANNELINDEX chn, uint16 note, uint16 volume);

	void SetupChannelFilter(ModChannel *pChn, bool bReset, int flt_modifier = 256) const;
	// Low-Level effect processing
	void DoFreqSlide(ModChannel *pChn, int32 nFreqSlide) const;
	void UpdateTimeSignature();

public:
	uint32 GetNumTicksOnCurrentRow() const
	{
		return (m_PlayState.m_nMusicSpeed  + m_PlayState.m_nFrameDelay) * std::max(m_PlayState.m_nPatternDelay, static_cast<uint32>(1));
	}

	bool DestroySample(SAMPLEINDEX nSample);
	bool DestroySampleThreadsafe(SAMPLEINDEX nSample);

	// Find an unused sample slot. If it is going to be assigned to an instrument, targetInstrument should be specified.
	// SAMPLEINDEX_INVLAID is returned if no free sample slot could be found.
	SAMPLEINDEX GetNextFreeSample(INSTRUMENTINDEX targetInstrument = INSTRUMENTINDEX_INVALID, SAMPLEINDEX start = 1) const;
	// Find an unused instrument slot.
	// INSTRUMENTINDEX_INVALID is returned if no free instrument slot could be found.
	INSTRUMENTINDEX GetNextFreeInstrument(INSTRUMENTINDEX start = 1) const;
	// Check whether a given sample is used by a given instrument.
	bool IsSampleReferencedByInstrument(SAMPLEINDEX sample, INSTRUMENTINDEX instr) const;

	ModInstrument *AllocateInstrument(INSTRUMENTINDEX instr, SAMPLEINDEX assignedSample = 0);
	bool DestroyInstrument(INSTRUMENTINDEX nInstr, deleteInstrumentSamples removeSamples);
	bool RemoveInstrumentSamples(INSTRUMENTINDEX nInstr, SAMPLEINDEX keepSample = SAMPLEINDEX_INVALID);
	SAMPLEINDEX DetectUnusedSamples(std::vector<bool> &sampleUsed) const;
	SAMPLEINDEX RemoveSelectedSamples(const std::vector<bool> &keepSamples);

	// Set the autovibrato settings for all samples associated to the given instrument.
	void PropagateXMAutoVibrato(INSTRUMENTINDEX ins, uint8 type, uint8 sweep, uint8 depth, uint8 rate);

	// Samples file I/O
	bool ReadSampleFromFile(SAMPLEINDEX nSample, FileReader &file, bool mayNormalize = false, bool includeInstrumentFormats = true);
	bool ReadWAVSample(SAMPLEINDEX nSample, FileReader &file, bool mayNormalize = false, FileReader *wsmpChunk = nullptr);
	bool ReadPATSample(SAMPLEINDEX nSample, FileReader &file);
	bool ReadS3ISample(SAMPLEINDEX nSample, FileReader &file);
	bool ReadAIFFSample(SAMPLEINDEX nSample, FileReader &file, bool mayNormalize = false);
	bool ReadAUSample(SAMPLEINDEX nSample, FileReader &file, bool mayNormalize = false);
	bool ReadXISample(SAMPLEINDEX nSample, FileReader &file);
	bool ReadITSSample(SAMPLEINDEX nSample, FileReader &file, bool rewind = true);
	bool ReadITISample(SAMPLEINDEX nSample, FileReader &file);
	bool ReadIFFSample(SAMPLEINDEX nInstr, FileReader &file);
	bool ReadFLACSample(SAMPLEINDEX sample, FileReader &file);
	bool ReadOpusSample(SAMPLEINDEX sample, FileReader &file);
	bool ReadVorbisSample(SAMPLEINDEX sample, FileReader &file);
	bool ReadMP3Sample(SAMPLEINDEX sample, FileReader &file, bool mo3Decode = false);
	bool ReadMediaFoundationSample(SAMPLEINDEX sample, FileReader &file, bool mo3Decode = false);
#ifdef MODPLUG_TRACKER
	static std::vector<FileType> GetMediaFoundationFileTypes();
#endif // MODPLUG_TRACKER
#ifndef MODPLUG_NO_FILESAVE
	bool SaveWAVSample(SAMPLEINDEX nSample, const mpt::PathString &filename) const;
	bool SaveRAWSample(SAMPLEINDEX nSample, const mpt::PathString &filename) const;
	bool SaveFLACSample(SAMPLEINDEX nSample, const mpt::PathString &filename) const;
#endif
	static bool CanReadMP3();
	static bool CanReadVorbis();

	// Instrument file I/O
	bool ReadInstrumentFromFile(INSTRUMENTINDEX nInstr, FileReader &file, bool mayNormalize=false);
	bool ReadXIInstrument(INSTRUMENTINDEX nInstr, FileReader &file);
	bool ReadITIInstrument(INSTRUMENTINDEX nInstr, FileReader &file);
	bool ReadPATInstrument(INSTRUMENTINDEX nInstr, FileReader &file);
	bool ReadSampleAsInstrument(INSTRUMENTINDEX nInstr, FileReader &file, bool mayNormalize=false);
#ifndef MODPLUG_NO_FILESAVE
	bool SaveXIInstrument(INSTRUMENTINDEX nInstr, const mpt::PathString &filename) const;
	bool SaveITIInstrument(INSTRUMENTINDEX nInstr, const mpt::PathString &filename, bool compress, bool allowExternal) const;
#endif

	// I/O from another sound file
	bool ReadInstrumentFromSong(INSTRUMENTINDEX targetInstr, const CSoundFile &srcSong, INSTRUMENTINDEX sourceInstr);
	bool ReadSampleFromSong(SAMPLEINDEX targetSample, const CSoundFile &srcSong, SAMPLEINDEX sourceSample);

	// Period/Note functions
	uint32 GetNoteFromPeriod(uint32 period, int32 nFineTune = 0, uint32 nC5Speed = 0) const;
	uint32 GetPeriodFromNote(uint32 note, int32 nFineTune, uint32 nC5Speed) const;
	uint32 GetFreqFromPeriod(uint32 period, uint32 c5speed, int32 nPeriodFrac = 0) const;
	// Misc functions
	ModSample &GetSample(SAMPLEINDEX sample) { MPT_ASSERT(sample <= m_nSamples && sample < CountOf(Samples)); return Samples[sample]; }
	const ModSample &GetSample(SAMPLEINDEX sample) const { MPT_ASSERT(sample <= m_nSamples && sample < CountOf(Samples)); return Samples[sample]; }

	uint32 MapMidiInstrument(uint32 dwProgram, uint32 nChannel, uint32 nNote);
	size_t ITInstrToMPT(FileReader &file, ModInstrument &ins, uint16 trkvers);
	void LoadMixPlugins(FileReader &file);
#ifndef NO_PLUGINS
	static void ReadMixPluginChunk(FileReader &file, SNDMIXPLUGIN &plugin);
	void ProcessMidiOut(CHANNELINDEX nChn);
#endif // NO_PLUGINS

	uint32 CutOffToFrequency(uint32 nCutOff, int flt_modifier = 256) const; // [0-127] => [1-10KHz]
	void ProcessGlobalVolume(long countChunk);
	void ProcessStereoSeparation(long countChunk);

private:
	PLUGINDEX GetChannelPlugin(CHANNELINDEX nChn, PluginMutePriority respectMutes) const;
	PLUGINDEX GetActiveInstrumentPlugin(CHANNELINDEX, PluginMutePriority respectMutes) const;
	IMixPlugin *GetChannelInstrumentPlugin(CHANNELINDEX chn) const;

	void HandlePatternTransitionEvents();

public:
	PLUGINDEX GetBestPlugin(CHANNELINDEX nChn, PluginPriority priority, PluginMutePriority respectMutes) const;
	uint8 GetBestMidiChannel(CHANNELINDEX nChn) const;

};


#ifndef NO_PLUGINS
inline IMixPlugin* CSoundFile::GetInstrumentPlugin(INSTRUMENTINDEX instr)
//-----------------------------------------------------------------------
{
	if(instr > 0 && instr < MAX_INSTRUMENTS && Instruments[instr] && Instruments[instr]->nMixPlug && Instruments[instr]->nMixPlug <= MAX_MIXPLUGINS)
		return m_MixPlugins[Instruments[instr]->nMixPlug - 1].pMixPlugin;
	else
		return nullptr;
}
#endif // NO_PLUGINS


///////////////////////////////////////////////////////////
// Low-level Mixing functions

#define SCRATCH_BUFFER_SIZE 64 //Used for plug's final processing (cleanup)
#define FADESONGDELAY		100

#define MOD2XMFineTune(k)	((int)( (signed char)((k)<<4) ))
#define XM2MODFineTune(k)	((int)( (k>>4)&0x0f ))

// Read instrument property with 'code' and 'size' from 'file' to instrument 'pIns'.
void ReadInstrumentExtensionField(ModInstrument* pIns, const uint32 code, const uint16 size, FileReader &file);

// Read instrument property with 'code' from 'file' to instrument 'pIns'.
void ReadExtendedInstrumentProperty(ModInstrument* pIns, const uint32 code, FileReader &file);

// Read extended instrument properties from 'file' to instrument 'pIns'.
void ReadExtendedInstrumentProperties(ModInstrument* pIns, FileReader &file);


OPENMPT_NAMESPACE_END
