1 files changed, 195 insertions, 0 deletions

diff --git a/include/sound/seq_midi_emul.h b/include/sound/seq_midi_emul.h
new file mode 100644
index 000000000000..e58ca45bc73b
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+++ b/include/sound/seq_midi_emul.h
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+#ifndef __SOUND_SEQ_MIDI_EMUL_H
+#define __SOUND_SEQ_MIDI_EMUL_H
+
+/*
+ *  Midi channel definition for optional channel management.
+ *
+ *  Copyright (C) 1999 Steve Ratcliffe
+ *
+ *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include "seq_kernel.h"
+
+/*
+ * This structure is used to keep track of the current state on each
+ * channel.  All drivers for hardware that does not understand midi
+ * directly will probably need to use this structure.
+ */
+typedef struct snd_midi_channel {
+        void *private;          /* A back pointer to driver data */
+        int  number;            /* The channel number */
+        int  client;            /* The client associated with this channel */
+        int  port;              /* The port associated with this channel */
+
+        unsigned char midi_mode;        /* GM, GS, XG etc */
+        unsigned int 
+                drum_channel:1,         /* Drum channel */
+                param_type:1            /* RPN/NRPN */
+                ;
+
+        unsigned char midi_aftertouch;  /* Aftertouch (key pressure) */
+        unsigned char midi_pressure;    /* Channel pressure */
+        unsigned char midi_program;     /* Instrument number */
+        short midi_pitchbend;           /* Pitch bend amount */
+
+        unsigned char control[128];     /* Current value of all controls */
+        unsigned char note[128];        /* Current status for all notes */
+
+        short gm_rpn_pitch_bend_range;  /* Pitch bend range */
+        short gm_rpn_fine_tuning;       /* Master fine tuning */
+        short gm_rpn_coarse_tuning;     /* Master coarse tuning */
+
+} snd_midi_channel_t;
+
+/*
+ * A structure that represets a set of channels bound to a port.  There
+ * would usually be 16 channels per port.  But fewer could be used for
+ * particular cases.
+ * The channel set consists of information describing the client and
+ * port for this midi synth and an array of snd_midi_channel_t structures.
+ * A driver that had no need for snd_midi_channel_t could still use the
+ * channel set type if it wished with the channel array null.
+ */
+typedef struct snd_midi_channel_set {
+        void *private_data;             /* Driver data */
+        int  client;                    /* Client for this port */
+        int  port;                      /* The port number */
+
+        int  max_channels;              /* Size of the channels array */
+        snd_midi_channel_t *channels;
+
+        unsigned char midi_mode;        /* MIDI operating mode */
+        unsigned char gs_master_volume; /* SYSEX master volume: 0-127 */
+        unsigned char gs_chorus_mode;
+        unsigned char gs_reverb_mode;
+
+} snd_midi_channel_set_t;
+
+typedef struct snd_seq_midi_op {
+        void (*note_on)(void *private_data, int note, int vel, snd_midi_channel_t *chan);
+        void (*note_off)(void *private_data,int note, int vel, snd_midi_channel_t *chan); /* release note */
+        void (*key_press)(void *private_data, int note, int vel, snd_midi_channel_t *chan);
+        void (*note_terminate)(void *private_data, int note, snd_midi_channel_t *chan); /* terminate note immediately */
+        void (*control)(void *private_data, int type, snd_midi_channel_t *chan);
+        void (*nrpn)(void *private_data, snd_midi_channel_t *chan, snd_midi_channel_set_t *chset);
+        void (*sysex)(void *private_data, unsigned char *buf, int len, int parsed, snd_midi_channel_set_t *chset);
+} snd_midi_op_t;
+
+/*
+ * These defines are used so that pitchbend, aftertouch etc, can be
+ * distinguished from controller values.
+ */
+/* 0-127 controller values */
+#define MIDI_CTL_PITCHBEND      0x80
+#define MIDI_CTL_AFTERTOUCH     0x81
+#define MIDI_CTL_CHAN_PRESSURE  0x82
+
+/*
+ * These names exist to allow symbolic access to the controls array.
+ * The usage is eg: chan->gm_bank_select.  Another implementation would
+ * be really have these members in the struct, and not the array.
+ */
+#define gm_bank_select          control[0]
+#define gm_modulation           control[1]
+#define gm_breath               control[2]
+#define gm_foot_pedal           control[4]
+#define gm_portamento_time      control[5]
+#define gm_data_entry           control[6]
+#define gm_volume               control[7]
+#define gm_balance              control[8]
+#define gm_pan                  control[10]
+#define gm_expression           control[11]
+#define gm_effect_control1      control[12]
+#define gm_effect_control2      control[13]
+#define gm_slider1              control[16]
+#define gm_slider2              control[17]
+#define gm_slider3              control[18]
+#define gm_slider4              control[19]
+
+#define gm_bank_select_lsb      control[32]
+#define gm_modulation_wheel_lsb control[33]
+#define gm_breath_lsb           control[34]
+#define gm_foot_pedal_lsb       control[36]
+#define gm_portamento_time_lsb  control[37]
+#define gm_data_entry_lsb       control[38]
+#define gm_volume_lsb           control[39]
+#define gm_balance_lsb          control[40]
+#define gm_pan_lsb              control[42]
+#define gm_expression_lsb       control[43]
+#define gm_effect_control1_lsb  control[44]
+#define gm_effect_control2_lsb  control[45]
+
+#define gm_sustain              control[MIDI_CTL_SUSTAIN]
+#define gm_hold                 gm_sustain
+#define gm_portamento           control[MIDI_CTL_PORTAMENTO]
+#define gm_sostenuto            control[MIDI_CTL_SOSTENUTO]
+
+/*
+ * These macros give the complete value of the controls that consist
+ * of coarse and fine pairs.  Of course the fine controls are seldom used
+ * but there is no harm in being complete.
+ */
+#define SNDRV_GM_BANK_SELECT(cp)                (((cp)->control[0]<<7)|((cp)->control[32]))
+#define SNDRV_GM_MODULATION_WHEEL(cp)   (((cp)->control[1]<<7)|((cp)->control[33]))
+#define SNDRV_GM_BREATH(cp)             (((cp)->control[2]<<7)|((cp)->control[34]))
+#define SNDRV_GM_FOOT_PEDAL(cp)         (((cp)->control[4]<<7)|((cp)->control[36]))
+#define SNDRV_GM_PORTAMENTO_TIME(cp)    (((cp)->control[5]<<7)|((cp)->control[37]))
+#define SNDRV_GM_DATA_ENTRY(cp)         (((cp)->control[6]<<7)|((cp)->control[38]))
+#define SNDRV_GM_VOLUME(cp)             (((cp)->control[7]<<7)|((cp)->control[39]))
+#define SNDRV_GM_BALANCE(cp)            (((cp)->control[8]<<7)|((cp)->control[40]))
+#define SNDRV_GM_PAN(cp)                        (((cp)->control[10]<<7)|((cp)->control[42]))
+#define SNDRV_GM_EXPRESSION(cp)         (((cp)->control[11]<<7)|((cp)->control[43]))
+
+
+/* MIDI mode */
+#define SNDRV_MIDI_MODE_NONE    0       /* Generic midi */
+#define SNDRV_MIDI_MODE_GM      1
+#define SNDRV_MIDI_MODE_GS      2
+#define SNDRV_MIDI_MODE_XG      3
+#define SNDRV_MIDI_MODE_MT32    4
+
+/* MIDI note state */
+#define SNDRV_MIDI_NOTE_OFF             0x00
+#define SNDRV_MIDI_NOTE_ON              0x01
+#define SNDRV_MIDI_NOTE_RELEASED                0x02
+#define SNDRV_MIDI_NOTE_SOSTENUTO               0x04
+ 
+#define SNDRV_MIDI_PARAM_TYPE_REGISTERED                0
+#define SNDRV_MIDI_PARAM_TYPE_NONREGISTERED     1
+
+/* SYSEX parse flag */
+enum {
+        SNDRV_MIDI_SYSEX_NOT_PARSED = 0,
+        SNDRV_MIDI_SYSEX_GM_ON, 
+        SNDRV_MIDI_SYSEX_GS_ON, 
+        SNDRV_MIDI_SYSEX_GS_RESET,      
+        SNDRV_MIDI_SYSEX_GS_CHORUS_MODE,
+        SNDRV_MIDI_SYSEX_GS_REVERB_MODE,
+        SNDRV_MIDI_SYSEX_GS_MASTER_VOLUME,
+        SNDRV_MIDI_SYSEX_GS_PROGRAM,
+        SNDRV_MIDI_SYSEX_GS_DRUM_CHANNEL,
+        SNDRV_MIDI_SYSEX_XG_ON, 
+};
+
+/* Prototypes for midi_process.c */
+void snd_midi_process_event(snd_midi_op_t *ops, snd_seq_event_t *ev,
+                            snd_midi_channel_set_t *chanset);
+void snd_midi_channel_set_clear(snd_midi_channel_set_t *chset);
+snd_midi_channel_set_t *snd_midi_channel_alloc_set(int n);
+void snd_midi_channel_free_set(snd_midi_channel_set_t *chset);
+
+#endif /* __SOUND_SEQ_MIDI_EMUL_H */