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/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2005 The ScummVM project
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * $Header: /cvsroot/scummvm/scummvm/scumm/imuse_internal.h,v 2005/10/18 02:11:21 sev Exp $


#include "common/scummsys.h"
#include "scumm/instrument.h"
#include "sound/mididrv.h"

class MidiParser;
class OSystem;

namespace Scumm {

// Unremark this statement to activate some of
// the most common iMuse diagnostic messages.
// #define IMUSE_DEBUG

struct ParameterFader;
struct DeferredCommand;
struct ImTrigger;
struct SustainingNotes;
struct CommandQueue;
struct IsNoteCmdData;
class  Player;
struct Part;
class  IMuseInternal;

// Some entities also referenced
class ScummEngine;

// Some constants

#define TICKS_PER_BEAT 480

#define TRIGGER_ID 0
#define COMMAND_ID 1

#define MDPG_TAG "MDpg"

//  Helper functions

inline int clamp(int val, int min, int max) {
      if (val < min)
            return min;
      if (val > max)
            return max;
      return val;

inline int transpose_clamp(int a, int b, int c) {
      if (b > a)
            a += (b - a + 11) / 12 * 12;
      if (c < a)
            a -= (a - c + 11) / 12 * 12;
      return a;

// Entity declarations

struct HookDatas {
      byte _jump[2];
      byte _transpose;
      byte _part_onoff[16];
      byte _part_volume[16];
      byte _part_program[16];
      byte _part_transpose[16];

      int query_param(int param, byte chan);
      int set(byte cls, byte value, byte chan);
      HookDatas() { memset(this, 0, sizeof(HookDatas)); }

struct ParameterFader {
      enum {
            pfVolume = 1,
            pfTranspose = 3,
            pfSpeed = 4

      int param;
      int start;
      int end;
      uint32 total_time;
      uint32 current_time;

      ParameterFader() { param = 0; }
      void init() { param = 0; }

struct DeferredCommand {
      uint32 time_left;
      int a, b, c, d, e, f;
      DeferredCommand() { memset(this, 0, sizeof(DeferredCommand)); }

struct ImTrigger {
      int sound;
      byte id;
      uint16 expire;
      int command [8];
      ImTrigger() { memset(this, 0, sizeof(ImTrigger)); }

struct CommandQueue {
      uint16 array[8];
      CommandQueue() { memset(this, 0, sizeof(CommandQueue)); }

class Player : public MidiDriver {
      // Moved from IMuseInternal.
      // This is only used by one player at a time.
      static uint16 _active_notes[128];

      MidiDriver *_midi;
      MidiParser *_parser;
      bool _passThrough; // Only respond to EOT, all else direct to MidiDriver

      Part *_parts;
      bool _active;
      bool _scanning;
      int _id;
      byte _priority;
      byte _volume;
      int8 _pan;
      int8 _transpose;
      int8 _detune;
      byte _vol_eff;

      uint _track_index;
      uint _loop_to_beat;
      uint _loop_from_beat;
      uint _loop_counter;
      uint _loop_to_tick;
      uint _loop_from_tick;
      byte _speed;
      bool _abort;

      // This does not get used by us! It is only
      // here for save/load purposes, and gets
      // passed on to the MidiParser during
      // fixAfterLoad().
      uint32 _music_tick;

      HookDatas _hook;
      ParameterFader _parameterFaders[4];

      bool _isMT32;
      bool _isMIDI;

      // Player part
      void hook_clear();
      void uninit_parts();
      byte *parse_midi(byte *s);
      void part_set_transpose(uint8 chan, byte relative, int8 b);
      void parse_sysex(byte *p, uint len);
      void maybe_jump(byte cmd, uint track, uint beat, uint tick);
      void maybe_set_transpose(byte *data);
      void maybe_part_onoff(byte *data);
      void maybe_set_volume(byte *data);
      void maybe_set_program(byte *data);
      void maybe_set_transpose_part(byte *data);
      void turn_off_pedals();
      int  query_part_param(int param, byte chan);
      void turn_off_parts();
      void play_active_notes();

      void transitionParameters();

      static void decode_sysex_bytes(const byte *src, byte *dst, int len);

      // Sequencer part
      int start_seq_sound(int sound, bool reset_vars = true);
      int query_param(int param);

      IMuseInternal *_se;
      uint _vol_chan;

      virtual ~Player();

      int    addParameterFader(int param, int target, int time);
      void clear();
      void clearLoop();
      void fixAfterLoad();
      Part * getActivePart(uint8 part);
      uint getBeatIndex();
      int8 getDetune() const { return _detune; }
      byte getEffectiveVolume() const { return _vol_eff; }
      int getID() const { return _id; }
      MidiDriver *getMidiDriver() const { return _midi; }
      int getParam(int param, byte chan);
      int8 getPan() const { return _pan; }
      Part * getPart(uint8 part);
      byte getPriority() const { return _priority; }
      uint getTicksPerBeat() const { return TICKS_PER_BEAT; }
      int8 getTranspose() const { return _transpose; }
      byte getVolume() const { return _volume; }
      bool isActive() const { return _active; }
      bool isFadingOut() const;
      bool isMIDI() const { return _isMIDI; }
      bool isMT32() const { return _isMT32; }
      bool jump(uint track, uint beat, uint tick);
      void onTimer();
      void removePart(Part *part);
      int scan(uint totrack, uint tobeat, uint totick);
      int save_or_load(Serializer *ser);
      int setHook(byte cls, byte value, byte chan) { return _hook.set(cls, value, chan); }
      void setDetune(int detune);
      bool setLoop(uint count, uint tobeat, uint totick, uint frombeat, uint fromtick);
      void setPan(int pan);
      void setPriority(int pri);
      void setSpeed(byte speed);
      int setTranspose(byte relative, int b);
      int setVolume(byte vol);
      bool startSound(int sound, MidiDriver *midi, bool passThrough);
      int getMusicTimer() const;

      // MidiDriver interface
      int open() { return 0; }
      void close() { }
      void send(uint32 b);
      const char *getErrorName(int error_code) { return "Unknown"; }
      void sysEx(byte *msg, uint16 length);
      void metaEvent(byte type, byte *data, uint16 length);
      void setTimerCallback(void *timer_param, void(*timer_proc)(void *)) { }
      uint32 getBaseTempo();
      MidiChannel *allocateChannel() { return 0; }
      MidiChannel *getPercussionChannel() { return 0; }

struct Part {
      int _slot;
      Part *_next, *_prev;
      MidiChannel *_mc;
      Player *_player;
      int16 _pitchbend;
      byte _pitchbend_factor;
      int8 _transpose, _transpose_eff;
      byte _vol, _vol_eff;
      int8 _detune, _detune_eff;
      int8 _pan, _pan_eff;
      bool _on;
      byte _modwheel;
      bool _pedal;
      int8 _pri;
      byte _pri_eff;
      byte _chan;
      byte _effect_level;
      byte _chorus;
      byte _percussion;
      byte _bank;

      // New abstract instrument definition
      Instrument _instrument;
      bool _unassigned_instrument; // For diagnostic reporting purposes only

      // MidiChannel interface
      // (We don't currently derive from MidiChannel,
      //  but if we ever do, this will make it easy.)
      void noteOff(byte note);
      void noteOn(byte note, byte velocity);
      void programChange(byte value);
      void pitchBend(int16 value);
      void modulationWheel(byte value);
      void volume(byte value);
      void pitchBendFactor(byte value);
      void sustain(bool value);
      void effectLevel(byte value);
      void chorusLevel(byte value);
      void allNotesOff();

      void set_param(byte param, int value) { }
      void init();
      void setup(Player *player);
      void uninit();
      void off();
      void set_instrument(uint b);
      void set_instrument(byte *data);
      void load_global_instrument(byte b);

      void set_transpose(int8 transpose);
      void set_detune(int8 detune);
      void set_pri(int8 pri);
      void set_pan(int8 pan);

      void set_onoff(bool on);
      void fix_after_load();

      void sendAll();
      void sendPitchBend();
      bool clearToTransmit();

      Part() {

// WARNING: This is the internal variant of the IMUSE class.
// imuse.h contains a public version of the same class.
// the public version, only contains a set of methods.
class IMuseInternal {
      friend class Player;

      bool _native_mt32;
      bool _enable_gs;
      bool _sc55;
      MidiDriver *_midi_adlib;
      MidiDriver *_midi_native;

      byte **_base_sounds;

      bool _paused;
      bool _initialized;

      int _tempoFactor;

      int  _player_limit;       // Limits how many simultaneous music tracks are played
      bool _recycle_players;    // Can we stop a player in order to start another one?
      bool _direct_passthrough; // Pass data direct to MidiDriver (no interactivity)

      uint _queue_end, _queue_pos, _queue_sound;
      byte _queue_adding;

      byte _queue_marker;
      byte _queue_cleared;
      byte _master_volume; // Master volume. 0-255
      byte _music_volume; // Global music volume. 0-255

      uint16 _trigger_count;
      ImTrigger _snm_triggers[16]; // Sam & Max triggers
      uint16 _snm_trigger_index;

      uint16 _channel_volume[8];
      uint16 _channel_volume_eff[8]; // No Save
      uint16 _volchan_table[8];

      Player _players[8];
      Part _parts[32];

      Instrument _global_adlib_instruments[32];
      CommandQueue _cmd_queue[64];
      DeferredCommand _deferredCommands[4];

      byte *findStartOfSound(int sound);
      bool isMT32(int sound);
      bool isMIDI(int sound);
      int get_queue_sound_status(int sound) const;
      void handle_marker(uint id, byte data);
      int get_channel_volume(uint a);
      void initMidiDriver(MidiDriver *midi);
      void initGM(MidiDriver *midi);
      void initMT32(MidiDriver *midi);
      void init_players();
      void init_parts();
      void init_queue();

      void sequencer_timers(MidiDriver *midi);

      MidiDriver *getBestMidiDriver(int sound);
      Player *allocate_player(byte priority);
      Part *allocate_part(byte pri, MidiDriver *midi);

      int32 ImSetTrigger(int sound, int id, int a, int b, int c, int d, int e, int f, int g, int h);
      int32 ImClearTrigger(int sound, int id);
      int32 ImFireAllTriggers(int sound);

      void addDeferredCommand(int time, int a, int b, int c, int d, int e, int f);
      void handleDeferredCommands(MidiDriver *midi);

      int enqueue_command(int a, int b, int c, int d, int e, int f, int g);
      int enqueue_trigger(int sound, int marker);
      int query_queue(int param);
      Player *findActivePlayer(int id);

      int get_volchan_entry(uint a);
      int set_volchan_entry(uint a, uint b);
      int set_channel_volume(uint chan, uint vol);
      void update_volumes();
      void reset_tick();

      int set_volchan(int sound, int volchan);

      void fix_parts_after_load();
      void fix_players_after_load(ScummEngine *scumm);

      static int saveReference(void *me_ref, byte type, void *ref);
      static void *loadReference(void *me_ref, byte type, int ref);

      static void midiTimerCallback(void *data);


      int initialize(OSystem *syst, MidiDriver *nativeMidiDriver, MidiDriver *adlibMidiDriver);
      void reallocateMidiChannels(MidiDriver *midi);
      void setGlobalAdlibInstrument(byte slot, byte *data);
      void copyGlobalAdlibInstrument(byte slot, Instrument *dest);
      bool isNativeMT32() { return _native_mt32; }

      // IMuse interface

      void on_timer(MidiDriver *midi);
      void pause(bool paused);
      int terminate1();
      int terminate2();
      int save_or_load(Serializer *ser, ScummEngine *scumm);
      int setMusicVolume(uint vol);
      int setImuseMasterVolume(uint vol);
      bool startSound(int sound);
      int stopSound(int sound);
      int stopAllSounds();
      int getSoundStatus(int sound, bool ignoreFadeouts = true) const;
      int getMusicTimer() const;
      int32 doCommand (int a, int b, int c, int d, int e, int f, int g, int h);
      int32 doCommand (int numargs, int args[]);
      int clear_queue();
      void setBase(byte **base);
      uint32 property(int prop, uint32 value);

      static IMuseInternal *create(OSystem *syst, MidiDriver *nativeMidiDriver, MidiDriver *adlibMidiDriver);

} // End of namespace Scumm


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