include/sound/seq_midi_emul.h

Source file repositories/reference/linux-study-clean/include/sound/seq_midi_emul.h

File Facts

System
Linux kernel
Corpus path
include/sound/seq_midi_emul.h
Extension
.h
Size
6785 bytes
Lines
185
Domain
Driver Families
Bucket
include/sound
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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 */

};

/*
 * 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 structures.
 * A driver that had no need for snd_midi_channel could still use the
 * channel set type if it wished with the channel array null.
 */
struct snd_midi_channel_set {
	void *private_data;		/* Driver data */
	int  client;			/* Client for this port */
	int  port;			/* The port number */

	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;

	int  max_channels;		/* Size of the channels array */
	struct snd_midi_channel channels[] __counted_by(max_channels);

};

struct snd_midi_op {
	void (*note_on)(void *private_data, int note, int vel, struct snd_midi_channel *chan);
	void (*note_off)(void *private_data,int note, int vel, struct snd_midi_channel *chan); /* release note */
	void (*key_press)(void *private_data, int note, int vel, struct snd_midi_channel *chan);
	void (*note_terminate)(void *private_data, int note, struct snd_midi_channel *chan); /* terminate note immediately */
	void (*control)(void *private_data, int type, struct snd_midi_channel *chan);
	void (*nrpn)(void *private_data, struct snd_midi_channel *chan,
		     struct snd_midi_channel_set *chset);
	void (*sysex)(void *private_data, unsigned char *buf, int len, int parsed,
		      struct snd_midi_channel_set *chset);
};

/*
 * 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]

Annotation

Implementation Notes