playmidi.h

SDL_mixer 是一个基于 SDL 的混音器

/*

    TiMidity -- Experimental MIDI to WAVE converter
    Copyright (C) 1995 Tuukka Toivonen <[e-mail]>

    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
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    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., 675 Mass Ave, Cambridge, MA 02139, USA.

   playmidi.h

   */

typedef struct {
  int32 time;
  uint8 channel, type, a, b;
} MidiEvent;

/* Midi events */
#define ME_NONE 	0
#define ME_NOTEON	1
#define ME_NOTEOFF	2
#define ME_KEYPRESSURE	3
#define ME_MAINVOLUME	4
#define ME_PAN		5
#define ME_SUSTAIN	6
#define ME_EXPRESSION	7
#define ME_PITCHWHEEL	8
#define ME_PROGRAM	9
#define ME_TEMPO	10
#define ME_PITCH_SENS	11

#define ME_ALL_SOUNDS_OFF	12
#define ME_RESET_CONTROLLERS	13
#define ME_ALL_NOTES_OFF	14
#define ME_TONE_BANK	15

#define ME_LYRIC	16
#define ME_TONE_KIT	17
#define ME_MASTERVOLUME	18
#define ME_CHANNEL_PRESSURE 19

#define ME_HARMONICCONTENT	71
#define ME_RELEASETIME		72
#define ME_ATTACKTIME		73
#define ME_BRIGHTNESS		74

#define ME_REVERBERATION	91
#define ME_CHORUSDEPTH		93

#define ME_EOT		99


#define SFX_BANKTYPE	64

typedef struct {
  int
    bank, program, volume, sustain, panning, pitchbend, expression, 
    mono, /* one note only on this channel -- not implemented yet */
    /* new stuff */
    variationbank, reverberation, chorusdepth, harmoniccontent,
    releasetime, attacktime, brightness, kit, sfx,
    /* end new */
    pitchsens;
  FLOAT_T
    pitchfactor; /* precomputed pitch bend factor to save some fdiv's */
  char transpose;
  char *name;
} Channel;

/* Causes the instrument's default panning to be used. */
#define NO_PANNING -1
/* envelope points */
#define MAXPOINT 7

typedef struct {
  uint8
    status, channel, note, velocity, clone_type;
  Sample *sample;
  Sample *left_sample;
  Sample *right_sample;
  int32 clone_voice;
  int32
    orig_frequency, frequency,
    sample_offset, loop_start, loop_end;
  int32
    envelope_volume, modulation_volume;
  int32
    envelope_target, modulation_target;
  int32
    tremolo_sweep, tremolo_sweep_position, tremolo_phase,
    lfo_sweep, lfo_sweep_position, lfo_phase,
    vibrato_sweep, vibrato_sweep_position, vibrato_depth, vibrato_delay,
    starttime, echo_delay_count;
  int32
    echo_delay,
    sample_increment,
    envelope_increment,
    modulation_increment,
    tremolo_phase_increment,
    lfo_phase_increment;
  
  final_volume_t left_mix, right_mix, lr_mix, rr_mix, ce_mix, lfe_mix;

  FLOAT_T
    left_amp, right_amp, lr_amp, rr_amp, ce_amp, lfe_amp,
    volume, tremolo_volume, lfo_volume;
  int32
    vibrato_sample_increment[VIBRATO_SAMPLE_INCREMENTS];
  int32
    envelope_rate[MAXPOINT], envelope_offset[MAXPOINT];
  int32
    vibrato_phase, vibrato_control_ratio, vibrato_control_counter,
    envelope_stage, modulation_stage, control_counter,
    modulation_delay, modulation_counter, panning, panned;
} Voice;

/* Voice status options: */
#define VOICE_FREE 0
#define VOICE_ON 1
#define VOICE_SUSTAINED 2
#define VOICE_OFF 3
#define VOICE_DIE 4

/* Voice panned options: */
#define PANNED_MYSTERY 0
#define PANNED_LEFT 1
#define PANNED_RIGHT 2
#define PANNED_CENTER 3
/* Anything but PANNED_MYSTERY only uses the left volume */

/* Envelope stages: */
#define ATTACK 0
#define HOLD 1
#define DECAY 2
#define RELEASE 3
#define RELEASEB 4
#define RELEASEC 5
#define DELAY 6

extern Channel channel[16];
extern Voice voice[MAX_VOICES];
extern signed char drumvolume[MAXCHAN][MAXNOTE];
extern signed char drumpanpot[MAXCHAN][MAXNOTE];
extern signed char drumreverberation[MAXCHAN][MAXNOTE];
extern signed char drumchorusdepth[MAXCHAN][MAXNOTE];

extern int32 control_ratio, amp_with_poly, amplification;
extern int32 drumchannels;
extern int adjust_panning_immediately;
extern int voices;

#define ISDRUMCHANNEL(c) ((drumchannels & (1<<(c))))

extern int GM_System_On;
extern int XG_System_On;
extern int GS_System_On;

extern int XG_System_reverb_type;
extern int XG_System_chorus_type;
extern int XG_System_variation_type;

extern int play_midi(MidiEvent *el, int32 events, int32 samples);
extern int play_midi_file(char *fn);
extern void dumb_pass_playing_list(int number_of_files, char *list_of_files[]);