TiMidity -- Experimental MIDI to WAVE converter

Copyright (C) 1995 Tuukka Toivonen <toivonen@clinet.fi>

This program is free software; you can redistribute it and/or modify

it under the terms of the Perl Artistic License, available in COPYING.

*/

#ifndef TIMIDITY_H

#define TIMIDITY_H

#ifdef __cplusplus

extern "C" {

#endif

typedef Sint16 sample_t;

typedef Sint32 final_volume_t;

#define VIBRATO_SAMPLE_INCREMENTS 32

/* Maximum polyphony. */

/* #define MAX_VOICES 48 */

#define MAX_VOICES 256

#define MAXCHAN 16

/* #define MAXCHAN 64 */

#define MAXBANK 128

typedef struct {

Sint32

loop_start, loop_end, data_length,

Sint32

envelope_rate[6], envelope_offset[6];

float

volume;

sample_t *data;

Sint32

tremolo_sweep_increment, tremolo_phase_increment,

vibrato_sweep_increment, vibrato_control_ratio;

Uint8

tremolo_depth, vibrato_depth,

modes;

Sint8

panning, note_to_use;

} Sample;

typedef struct {

int

bank, program, volume, sustain, panning, pitchbend, expression,

mono, /* one note only on this channel -- not implemented yet */

pitchsens;

/* chorus, reverb... Coming soon to a 300-MHz, eight-way superscalar

processor near you */

float

pitchfactor; /* precomputed pitch bend factor to save some fdiv's */

} Channel;

typedef struct {

Uint8

status, channel, note, velocity;

Sample *sample;

Sint32

orig_frequency, frequency,

sample_offset, sample_increment,

envelope_volume, envelope_target, envelope_increment,

tremolo_sweep, tremolo_sweep_position,

tremolo_phase, tremolo_phase_increment,

vibrato_sweep, vibrato_sweep_position;

final_volume_t left_mix, right_mix;

float

left_amp, right_amp, tremolo_volume;

Sint32

vibrato_sample_increment[VIBRATO_SAMPLE_INCREMENTS];

int

vibrato_phase, vibrato_control_ratio, vibrato_control_counter,

envelope_stage, control_counter, panning, panned;

typedef struct {

int samples;

Sample *sample;

} Instrument;

/* Shared data */

typedef struct {

char *name;

int note, amp, pan, strip_loop, strip_envelope, strip_tail;

} ToneBankElement;

typedef struct {

ToneBankElement *tone;

Instrument *instrument[128];

} ToneBank;

typedef struct {

Sint32 time;

Uint8 channel, type, a, b;

} MidiEvent;

typedef struct {

MidiEvent event;

void *next;

} MidiEventList;

typedef struct {

int playing;

SDL_RWops *rw;

Sint32 rate;

Sint32 encoding;

float master_volume;

Sint32 amplification;

ToneBank *tonebank[MAXBANK];

ToneBank *drumset[MAXBANK];

Instrument *default_instrument;

int default_program;

void (*write)(void *dp, Sint32 *lp, Sint32 c);

int buffer_size;

sample_t *resample_buffer;

Sint32 *common_buffer;

Sint32 *buffer_pointer;

/* These would both fit into 32 bits, but they are often added in

large multiples, so it's simpler to have two roomy ints */

/* samples per MIDI delta-t */

Sint32 sample_increment;

Sint32 sample_correction;

Channel channel[MAXCHAN];

Voice voice[MAX_VOICES];

int voices;

Sint32 drumchannels;

Sint32 buffered_count;

Sint32 control_ratio;

Sint32 lost_notes;

Sint32 cut_notes;

Sint32 samples;

MidiEvent *events;

MidiEvent *current_event;

MidiEventList *evlist;

Sint32 current_sample;

Sint32 event_count;

Sint32 at;

Sint32 groomed_event_count;

} MidiSong;

/* Some of these are not defined in timidity.c but are here for convenience */

extern int Timidity_Init(void);

extern int Timidity_Init_NoConfig(void);

extern void Timidity_SetVolume(MidiSong *song, int volume);

extern int Timidity_PlaySome(MidiSong *song, void *stream, Sint32 len);

extern MidiSong *Timidity_LoadSong(SDL_RWops *rw, SDL_AudioSpec *audio);

extern void Timidity_Seek(MidiSong *song, Uint32 ms);

extern Uint32 Timidity_GetSongLength(MidiSong *song); /* returns millseconds */

extern void Timidity_Exit(void);

#ifdef __cplusplus

}

#endif

#endif /* TIMIDITY_H */