root/include/sound/seq_midi_emul.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __SOUND_SEQ_MIDI_EMUL_H
   3 #define __SOUND_SEQ_MIDI_EMUL_H
   4 
   5 /*
   6  *  Midi channel definition for optional channel management.
   7  *
   8  *  Copyright (C) 1999 Steve Ratcliffe
   9  */
  10 
  11 #include <sound/seq_kernel.h>
  12 
  13 /*
  14  * This structure is used to keep track of the current state on each
  15  * channel.  All drivers for hardware that does not understand midi
  16  * directly will probably need to use this structure.
  17  */
  18 struct snd_midi_channel {
  19         void *private;          /* A back pointer to driver data */
  20         int  number;            /* The channel number */
  21         int  client;            /* The client associated with this channel */
  22         int  port;              /* The port associated with this channel */
  23 
  24         unsigned char midi_mode;        /* GM, GS, XG etc */
  25         unsigned int 
  26                 drum_channel:1,         /* Drum channel */
  27                 param_type:1            /* RPN/NRPN */
  28                 ;
  29 
  30         unsigned char midi_aftertouch;  /* Aftertouch (key pressure) */
  31         unsigned char midi_pressure;    /* Channel pressure */
  32         unsigned char midi_program;     /* Instrument number */
  33         short midi_pitchbend;           /* Pitch bend amount */
  34 
  35         unsigned char control[128];     /* Current value of all controls */
  36         unsigned char note[128];        /* Current status for all notes */
  37 
  38         short gm_rpn_pitch_bend_range;  /* Pitch bend range */
  39         short gm_rpn_fine_tuning;       /* Master fine tuning */
  40         short gm_rpn_coarse_tuning;     /* Master coarse tuning */
  41 
  42 };
  43 
  44 /*
  45  * A structure that represets a set of channels bound to a port.  There
  46  * would usually be 16 channels per port.  But fewer could be used for
  47  * particular cases.
  48  * The channel set consists of information describing the client and
  49  * port for this midi synth and an array of snd_midi_channel structures.
  50  * A driver that had no need for snd_midi_channel could still use the
  51  * channel set type if it wished with the channel array null.
  52  */
  53 struct snd_midi_channel_set {
  54         void *private_data;             /* Driver data */
  55         int  client;                    /* Client for this port */
  56         int  port;                      /* The port number */
  57 
  58         int  max_channels;              /* Size of the channels array */
  59         struct snd_midi_channel *channels;
  60 
  61         unsigned char midi_mode;        /* MIDI operating mode */
  62         unsigned char gs_master_volume; /* SYSEX master volume: 0-127 */
  63         unsigned char gs_chorus_mode;
  64         unsigned char gs_reverb_mode;
  65 
  66 };
  67 
  68 struct snd_midi_op {
  69         void (*note_on)(void *private_data, int note, int vel, struct snd_midi_channel *chan);
  70         void (*note_off)(void *private_data,int note, int vel, struct snd_midi_channel *chan); /* release note */
  71         void (*key_press)(void *private_data, int note, int vel, struct snd_midi_channel *chan);
  72         void (*note_terminate)(void *private_data, int note, struct snd_midi_channel *chan); /* terminate note immediately */
  73         void (*control)(void *private_data, int type, struct snd_midi_channel *chan);
  74         void (*nrpn)(void *private_data, struct snd_midi_channel *chan,
  75                      struct snd_midi_channel_set *chset);
  76         void (*sysex)(void *private_data, unsigned char *buf, int len, int parsed,
  77                       struct snd_midi_channel_set *chset);
  78 };
  79 
  80 /*
  81  * These defines are used so that pitchbend, aftertouch etc, can be
  82  * distinguished from controller values.
  83  */
  84 /* 0-127 controller values */
  85 #define MIDI_CTL_PITCHBEND      0x80
  86 #define MIDI_CTL_AFTERTOUCH     0x81
  87 #define MIDI_CTL_CHAN_PRESSURE  0x82
  88 
  89 /*
  90  * These names exist to allow symbolic access to the controls array.
  91  * The usage is eg: chan->gm_bank_select.  Another implementation would
  92  * be really have these members in the struct, and not the array.
  93  */
  94 #define gm_bank_select          control[0]
  95 #define gm_modulation           control[1]
  96 #define gm_breath               control[2]
  97 #define gm_foot_pedal           control[4]
  98 #define gm_portamento_time      control[5]
  99 #define gm_data_entry           control[6]
 100 #define gm_volume               control[7]
 101 #define gm_balance              control[8]
 102 #define gm_pan                  control[10]
 103 #define gm_expression           control[11]
 104 #define gm_effect_control1      control[12]
 105 #define gm_effect_control2      control[13]
 106 #define gm_slider1              control[16]
 107 #define gm_slider2              control[17]
 108 #define gm_slider3              control[18]
 109 #define gm_slider4              control[19]
 110 
 111 #define gm_bank_select_lsb      control[32]
 112 #define gm_modulation_wheel_lsb control[33]
 113 #define gm_breath_lsb           control[34]
 114 #define gm_foot_pedal_lsb       control[36]
 115 #define gm_portamento_time_lsb  control[37]
 116 #define gm_data_entry_lsb       control[38]
 117 #define gm_volume_lsb           control[39]
 118 #define gm_balance_lsb          control[40]
 119 #define gm_pan_lsb              control[42]
 120 #define gm_expression_lsb       control[43]
 121 #define gm_effect_control1_lsb  control[44]
 122 #define gm_effect_control2_lsb  control[45]
 123 
 124 #define gm_sustain              control[MIDI_CTL_SUSTAIN]
 125 #define gm_hold                 gm_sustain
 126 #define gm_portamento           control[MIDI_CTL_PORTAMENTO]
 127 #define gm_sostenuto            control[MIDI_CTL_SOSTENUTO]
 128 
 129 /*
 130  * These macros give the complete value of the controls that consist
 131  * of coarse and fine pairs.  Of course the fine controls are seldom used
 132  * but there is no harm in being complete.
 133  */
 134 #define SNDRV_GM_BANK_SELECT(cp)                (((cp)->control[0]<<7)|((cp)->control[32]))
 135 #define SNDRV_GM_MODULATION_WHEEL(cp)   (((cp)->control[1]<<7)|((cp)->control[33]))
 136 #define SNDRV_GM_BREATH(cp)             (((cp)->control[2]<<7)|((cp)->control[34]))
 137 #define SNDRV_GM_FOOT_PEDAL(cp)         (((cp)->control[4]<<7)|((cp)->control[36]))
 138 #define SNDRV_GM_PORTAMENTO_TIME(cp)    (((cp)->control[5]<<7)|((cp)->control[37]))
 139 #define SNDRV_GM_DATA_ENTRY(cp)         (((cp)->control[6]<<7)|((cp)->control[38]))
 140 #define SNDRV_GM_VOLUME(cp)             (((cp)->control[7]<<7)|((cp)->control[39]))
 141 #define SNDRV_GM_BALANCE(cp)            (((cp)->control[8]<<7)|((cp)->control[40]))
 142 #define SNDRV_GM_PAN(cp)                        (((cp)->control[10]<<7)|((cp)->control[42]))
 143 #define SNDRV_GM_EXPRESSION(cp)         (((cp)->control[11]<<7)|((cp)->control[43]))
 144 
 145 
 146 /* MIDI mode */
 147 #define SNDRV_MIDI_MODE_NONE    0       /* Generic midi */
 148 #define SNDRV_MIDI_MODE_GM      1
 149 #define SNDRV_MIDI_MODE_GS      2
 150 #define SNDRV_MIDI_MODE_XG      3
 151 #define SNDRV_MIDI_MODE_MT32    4
 152 
 153 /* MIDI note state */
 154 #define SNDRV_MIDI_NOTE_OFF             0x00
 155 #define SNDRV_MIDI_NOTE_ON              0x01
 156 #define SNDRV_MIDI_NOTE_RELEASED                0x02
 157 #define SNDRV_MIDI_NOTE_SOSTENUTO               0x04
 158  
 159 #define SNDRV_MIDI_PARAM_TYPE_REGISTERED                0
 160 #define SNDRV_MIDI_PARAM_TYPE_NONREGISTERED     1
 161 
 162 /* SYSEX parse flag */
 163 enum {
 164         SNDRV_MIDI_SYSEX_NOT_PARSED = 0,
 165         SNDRV_MIDI_SYSEX_GM_ON, 
 166         SNDRV_MIDI_SYSEX_GS_ON, 
 167         SNDRV_MIDI_SYSEX_GS_RESET,      
 168         SNDRV_MIDI_SYSEX_GS_CHORUS_MODE,
 169         SNDRV_MIDI_SYSEX_GS_REVERB_MODE,
 170         SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME,
 171         SNDRV_MIDI_SYSEX_GS_PROGRAM,
 172         SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL,
 173         SNDRV_MIDI_SYSEX_XG_ON, 
 174 };
 175 
 176 /* Prototypes for midi_process.c */
 177 void snd_midi_process_event(struct snd_midi_op *ops, struct snd_seq_event *ev,
 178                             struct snd_midi_channel_set *chanset);
 179 void snd_midi_channel_set_clear(struct snd_midi_channel_set *chset);
 180 struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n);
 181 void snd_midi_channel_free_set(struct snd_midi_channel_set *chset);
 182 
 183 #endif /* __SOUND_SEQ_MIDI_EMUL_H */