asound.h

unxi下共享内存的使用

	int frag;			/* current fragment */
	int count;			/* number of bytes in queue/buffer */
	int free;			/* bytes in queue still free */
	int underrun;			/* count of underruns (playback) from last status */
	int overrun;			/* count of overruns (capture) from last status */
	int overrange;			/* count of ADC (capture) overrange detections from last status */
	char reserved[64];		/* must be filled with zero */
} snd_pcm_channel_status_t;

typedef struct {
	volatile int status;		/* RO: status - SND_PCM_STATUS_XXXX */
	volatile int frag_io;		/* RO: index to the fragment under I/O operation */
	int frags;			/* RO: fragments */
	int frag_size;			/* RO: fragment size */
	int voices;			/* RO: number of voices, -1 = interleaved */
	volatile unsigned int block;	/* RO: block number */
	volatile unsigned int expblock; /* RW: expected block number for wakeup */
	int res[9];			/* reserved */
} snd_pcm_mmap_io_status_t;

typedef struct {
	unsigned int number;		/* RO: fragment number */
	off_t addr;			/* RO: fragment address */
	int voice;			/* RO: voice number, -1 = interleaved */
	volatile char data;		/* RW: non-zero - contains valid data */
	volatile char io;		/* RO: non-zero - I/O operation (don't change data) */
	char res[2];			/* reserved */
} snd_pcm_mmap_fragment_t;

typedef struct {
	snd_pcm_mmap_io_status_t status;
	snd_pcm_mmap_fragment_t fragments[128];
} snd_pcm_mmap_control_t;

#define SND_PCM_IOCTL_PVERSION		_IOR ('A', 0x00, int)
#define SND_PCM_IOCTL_INFO		_IOR ('A', 0x01, snd_pcm_info_t)
#define SND_PCM_IOCTL_CHANNEL_INFO	_IOR ('A', 0x02, snd_pcm_channel_info_t)
#define SND_PCM_IOCTL_CHANNEL_PARAMS	_IOW ('A', 0x10, snd_pcm_channel_params_t)
#define SND_PCM_IOCTL_CHANNEL_SETUP	_IOR ('A', 0x20, snd_pcm_channel_setup_t)
#define SND_PCM_IOCTL_CHANNEL_STATUS	_IOR ('A', 0x21, snd_pcm_channel_status_t)
#define SND_PCM_IOCTL_CHANNEL_PREPARE	_IO  ('A', 0x30)
#define SND_PCM_IOCTL_CHANNEL_GO	_IO  ('A', 0x31)
#define SND_PCM_IOCTL_CHANNEL_FLUSH	_IO  ('A', 0x32)
#define SND_PCM_IOCTL_SYNC_GO		_IOW ('A', 0x33, snd_pcm_sync_t)
#define SND_PCM_IOCTL_CHANNEL_DRAIN	_IO  ('A', 0x34)
#define SND_PCM_IOCTL_CHANNEL_PAUSE	_IOW ('A', 0x35, int)

/*
 *  Loopback interface
 */

#define SND_PCM_LB_VERSION		SND_PROTOCOL_VERSION(1, 0, 0)

#define SND_PCM_LB_STREAM_MODE_RAW	0
#define SND_PCM_LB_STREAM_MODE_PACKET	1

#define SND_PCM_LB_TYPE_DATA		0	/* sample data */
#define SND_PCM_LB_TYPE_FORMAT		1	/* format change */
#define SND_PCM_LB_TYPE_POSITION	2	/* position change (in bytes) */
#define SND_PCM_LB_TYPE_SILENCE		3	/* silence (no data) */

typedef struct snd_pcm_loopback_header {
	int size;			/* block size in bytes */
	int type;			/* block type (SND_PCM_LB_TYPE_*) */
} snd_pcm_loopback_header_t;

typedef struct snd_pcm_loopback_status {
	snd_pcm_channel_status_t status; /* channel status */
	unsigned int lost;		/* bytes lost */
} snd_pcm_loopback_status_t;

#define SND_PCM_LB_IOCTL_PVERSION	_IOR ('L', 0x00, int)
#define SND_PCM_LB_IOCTL_STREAM_MODE	_IOW ('L', 0x01, int)
#define SND_PCM_LB_IOCTL_FORMAT		_IOR ('L', 0x02, snd_pcm_format_t)
#define SND_PCM_LB_IOCTL_STATUS		_IOR ('L', 0x03, snd_pcm_loopback_status_t)

/*
 *  Interface compatible with Open Sound System API
 */

#ifdef __SND_OSS_COMPAT__

#define SND_PCM_AFMT_QUERY		0
#define SND_PCM_AFMT_MU_LAW		(1<<0)
#define SND_PCM_AFMT_A_LAW		(1<<1)
#define SND_PCM_AFMT_IMA_ADPCM		(1<<2)
#define SND_PCM_AFMT_U8			(1<<3)
#define SND_PCM_AFMT_S16_LE		(1<<4)
#define SND_PCM_AFMT_S16_BE		(1<<5)
#define SND_PCM_AFMT_S8			(1<<6)
#define SND_PCM_AFMT_U16_LE		(1<<7)
#define SND_PCM_AFMT_U16_BE		(1<<8)
#define SND_PCM_AFMT_MPEG		(1<<9)

#define SND_PCM_ENABLE_CAPTURE		0x00000001
#define SND_PCM_ENABLE_PLAYBACK		0x00000002

#define SND_PCM_CAP_REVISION		0x000000ff
#define SND_PCM_CAP_DUPLEX		0x00000100
#define SND_PCM_CAP_REALTIME		0x00000200
#define SND_PCM_CAP_BATCH		0x00000400
#define SND_PCM_CAP_COPROC		0x00000800
#define SND_PCM_CAP_TRIGGER		0x00001000
#define SND_PCM_CAP_MMAP		0x00002000

#define SND_PCM_AFP_NORMAL		0
#define SND_PCM_AFP_NETWORK		1
#define SND_PCM_AFP_CPUINTENS		2

struct snd_pcm_buffer_info {
	int fragments;		/* # of available fragments (partially used ones not counted) */
	int fragstotal;		/* Total # of fragments allocated */
	int fragsize;		/* Size of a fragment in bytes */
	int bytes;		/* Available space in bytes (includes partially used fragments) */
};

struct snd_pcm_count_info {
	int bytes;		/* Total # of bytes processed */
	int blocks;		/* # of fragment transitions since last time */
	int ptr;		/* Current DMA pointer value */
};

struct snd_pcm_buffer_description {
	unsigned char *buffer;
	int size;
};

#define SND_PCM_IOCTL_OSS_RESET		_IO  ('P', 0)
#define SND_PCM_IOCTL_OSS_SYNC		_IO  ('P', 1)
#define SND_PCM_IOCTL_OSS_RATE		_IOWR('P', 2, int)
#define SND_PCM_IOCTL_OSS_GETRATE	_IOR ('P', 2, int)
#define SND_PCM_IOCTL_OSS_STEREO	_IOWR('P', 3, int)
#define SND_PCM_IOCTL_OSS_GETBLKSIZE	_IOWR('P', 4, int)
#define SND_PCM_IOCTL_OSS_FORMAT	_IOWR('P', 5, int)
#define SND_PCM_IOCTL_OSS_GETFORMAT	_IOR ('P', 5, int)
#define SND_PCM_IOCTL_OSS_CHANNELS	_IOWR('P', 6, int)
#define SND_PCM_IOCTL_OSS_GETCHANNELS	_IOR ('P', 6, int)
#define SND_PCM_IOCTL_OSS_FILTER	_IOWR('P', 7, int)
#define SND_PCM_IOCTL_OSS_GETFILTER	_IOR ('P', 7, int)
#define SND_PCM_IOCTL_OSS_POST		_IO  ('P', 8 )
#define SND_PCM_IOCTL_OSS_SUBDIVIDE	_IOWR('P', 9, int)
#define SND_PCM_IOCTL_OSS_SETFRAGMENT	_IOWR('P', 10, int)
#define SND_PCM_IOCTL_OSS_GETFORMATS	_IOR ('P', 11, int)
#define SND_PCM_IOCTL_OSS_GETPBKSPACE	_IOR ('P', 12, struct snd_pcm_buffer_info)
#define SND_PCM_IOCTL_OSS_GETRECSPACE	_IOR ('P', 13, struct snd_pcm_buffer_info)
#define SND_PCM_IOCTL_OSS_NONBLOCK	_IO  ('P', 14)
#define SND_PCM_IOCTL_OSS_GETCAPS	_IOR ('P', 15, int)
#define SND_PCM_IOCTL_OSS_GETTRIGGER	_IOR ('P', 16, int)
#define SND_PCM_IOCTL_OSS_SETTRIGGER	_IOW ('P', 16, int)
#define SND_PCM_IOCTL_OSS_GETRECPTR	_IOR ('P', 17, struct snd_pcm_count_info)
#define SND_PCM_IOCTL_OSS_GETPBKPTR	_IOR ('P', 18, struct snd_pcm_count_info)
#define SND_PCM_IOCTL_OSS_MAPRECBUFFER	_IOR ('P', 19, struct snd_pcm_buffer_description)
#define SND_PCM_IOCTL_OSS_MAPPBKBUFFER	_IOR ('P', 20, struct snd_pcm_buffer_description)
#define SND_PCM_IOCTL_OSS_SYNCRO	_IO  ('P', 21)
#define SND_PCM_IOCTL_OSS_DUPLEX	_IO  ('P', 22)
#define SND_PCM_IOCTL_OSS_GETODELAY	_IOR ('P', 23, int)
#define SND_PCM_IOCTL_OSS_PROFILE	_IOW ('P', 23, int)

#endif				/* __SND_OSS_COMPAT__ */

/*****************************************************************************
 *                                                                           *
 *                            MIDI v1.0 interface                            *
 *                                                                           *
 *****************************************************************************/

#define SND_MIDI_CHANNELS		16
#define SND_MIDI_GM_DRUM_CHANNEL	(10-1)

/*
 *  MIDI commands
 */

#define SND_MCMD_NOTE_OFF		0x80
#define SND_MCMD_NOTE_ON		0x90
#define SND_MCMD_NOTE_PRESSURE		0xa0
#define SND_MCMD_CONTROL		0xb0
#define SND_MCMD_PGM_CHANGE		0xc0
#define SND_MCMD_CHANNEL_PRESSURE	0xd0
#define SND_MCMD_BENDER			0xe0

#define SND_MCMD_COMMON_SYSEX		0xf0
#define SND_MCMD_COMMON_MTC_QUARTER	0xf1
#define SND_MCMD_COMMON_SONG_POS	0xf2
#define SND_MCMD_COMMON_SONG_SELECT	0xf3
#define SND_MCMD_COMMON_TUNE_REQUEST	0xf6
#define SND_MCMD_COMMON_SYSEX_END	0xf7
#define SND_MCMD_COMMON_CLOCK		0xf8
#define SND_MCMD_COMMON_START		0xfa
#define SND_MCMD_COMMON_CONTINUE	0xfb
#define SND_MCMD_COMMON_STOP		0xfc
#define SND_MCMD_COMMON_SENSING		0xfe
#define SND_MCMD_COMMON_RESET		0xff

/*
 *  MIDI controllers
 */

#define SND_MCTL_MSB_BANK		0x00
#define SND_MCTL_MSB_MODWHEEL         	0x01
#define SND_MCTL_MSB_BREATH           	0x02
#define SND_MCTL_MSB_FOOT             	0x04
#define SND_MCTL_MSB_PORTNAMENTO_TIME 	0x05
#define SND_MCTL_MSB_DATA_ENTRY		0x06
#define SND_MCTL_MSB_MAIN_VOLUME      	0x07
#define SND_MCTL_MSB_BALANCE          	0x08
#define SND_MCTL_MSB_PAN              	0x0a
#define SND_MCTL_MSB_EXPRESSION       	0x0b
#define SND_MCTL_MSB_EFFECT1		0x0c
#define SND_MCTL_MSB_EFFECT2		0x0d
#define SND_MCTL_MSB_GENERAL_PURPOSE1 	0x10
#define SND_MCTL_MSB_GENERAL_PURPOSE2 	0x11
#define SND_MCTL_MSB_GENERAL_PURPOSE3 	0x12
#define SND_MCTL_MSB_GENERAL_PURPOSE4 	0x13
#define SND_MCTL_LSB_BANK		0x20
#define SND_MCTL_LSB_MODWHEEL        	0x21
#define SND_MCTL_LSB_BREATH           	0x22
#define SND_MCTL_LSB_FOOT             	0x24
#define SND_MCTL_LSB_PORTNAMENTO_TIME 	0x25
#define SND_MCTL_LSB_DATA_ENTRY		0x26
#define SND_MCTL_LSB_MAIN_VOLUME      	0x27
#define SND_MCTL_LSB_BALANCE          	0x28
#define SND_MCTL_LSB_PAN              	0x2a
#define SND_MCTL_LSB_EXPRESSION       	0x2b
#define SND_MCTL_LSB_EFFECT1		0x2c
#define SND_MCTL_LSB_EFFECT2		0x2d
#define SND_MCTL_LSB_GENERAL_PURPOSE1 	0x30
#define SND_MCTL_LSB_GENERAL_PURPOSE2 	0x31
#define SND_MCTL_LSB_GENERAL_PURPOSE3 	0x32
#define SND_MCTL_LSB_GENERAL_PURPOSE4 	0x33
#define SND_MCTL_SUSTAIN              	0x40
#define SND_MCTL_PORTAMENTO           	0x41
#define SND_MCTL_SUSTENUTO            	0x42
#define SND_MCTL_SOFT_PEDAL           	0x43
#define SND_MCTL_LEGATO_FOOTSWITCH	0x44
#define SND_MCTL_HOLD2                	0x45
#define SND_MCTL_SC1_SOUND_VARIATION	0x46
#define SND_MCTL_SC2_TIMBRE		0x47
#define SND_MCTL_SC3_RELEASE_TIME	0x48
#define SND_MCTL_SC4_ATTACK_TIME	0x49
#define SND_MCTL_SC5_BRIGHTNESS		0x4a
#define SND_MCTL_SC6			0x4b
#define SND_MCTL_SC7			0x4c
#define SND_MCTL_SC8			0x4d
#define SND_MCTL_SC9			0x4e
#define SND_MCTL_SC10			0x4f
#define SND_MCTL_GENERAL_PURPOSE5     	0x50
#define SND_MCTL_GENERAL_PURPOSE6     	0x51
#define SND_MCTL_GENERAL_PURPOSE7     	0x52
#define SND_MCTL_GENERAL_PURPOSE8     	0x53
#define SND_MCTL_PORNAMENTO_CONTROL	0x54
#define SND_MCTL_E1_REVERB_DEPTH	0x5b
#define SND_MCTL_E2_TREMOLO_DEPTH	0x5c
#define SND_MCTL_E3_CHORUS_DEPTH	0x5d
#define SND_MCTL_E4_DETUNE_DEPTH	0x5e
#define SND_MCTL_E5_PHASER_DEPTH	0x5f
#define SND_MCTL_DATA_INCREMENT       	0x60
#define SND_MCTL_DATA_DECREMENT       	0x61
#define SND_MCTL_NONREG_PARM_NUM_LSB  	0x62
#define SND_MCTL_NONREG_PARM_NUM_MSB  	0x63
#define SND_MCTL_REGIST_PARM_NUM_LSB  	0x64
#define SND_MCTL_REGIST_PARM_NUM_MSB	0x65
#define SND_MCTL_ALL_SOUNDS_OFF		0x78
#define SND_MCTL_RESET_CONTROLLERS	0x79
#define SND_MCTL_LOCAL_CONTROL_SWITCH	0x7a
#define SND_MCTL_ALL_NOTES_OFF		0x7b
#define SND_MCTL_OMNI_OFF		0x7c
#define SND_MCTL_OMNI_ON		0x7d
#define SND_MCTL_MONO1			0x7e
#define SND_MCTL_MONO2			0x7f

/*
 *  Raw MIDI section - /dev/snd/midi??
 */

#define SND_RAWMIDI_VERSION		SND_PROTOCOL_VERSION(1, 0, 0)

#define SND_RAWMIDI_CHANNEL_OUTPUT	0
#define SND_RAWMIDI_CHANNEL_INPUT	1

#define SND_RAWMIDI_INFO_OUTPUT		0x00000001
#define SND_RAWMIDI_INFO_INPUT		0x00000002
#define SND_RAWMIDI_INFO_DUPLEX		0x00000004

typedef struct snd_rawmidi_info {
	unsigned int type;		/* soundcard type */
	unsigned int flags;		/* SND_RAWMIDI_INFO_XXXX */
	unsigned char id[64];		/* ID of this raw midi device (user selectable) */
	unsigned char name[80];		/* name of this raw midi device */
	unsigned char reserved[64];	/* reserved for future use */
} snd_rawmidi_info_t;

typedef struct snd_rawmidi_params {
	int channel;		/* Requested channel */
	int size;		/* I/O requested queue size in bytes */
	int min;		/* I minimum number of bytes fragments for wakeup */
	int max;		/* O maximum number of bytes in queue for wakeup */
	int room;		/* minumum number of bytes writeable for wakeup */
	unsigned char reserved[16];	/* reserved for future use */
} snd_rawmidi_params_t;

typedef struct snd_rawmidi_status {
	int channel;		/* Requested channel */
	int size;		/* I/O real queue size */
	int count;		/* I/O number of bytes readable/writeable without blocking */
	int queue;		/* O number of bytes in queue */
	int pad;		/* O not used yet */
	int free;		/* I bytes in buffer still free */
	int overrun;		/* I count of overruns from last status (in bytes) */
	unsigned char reserved[16];	/* reserved for future use */
} snd_rawmidi_status_t;

#define SND_RAWMIDI_IOCTL_PVERSION	_IOR ('W', 0x00, int)
#define SND_RAWMIDI_IOCTL_INFO		_IOR ('W', 0x01, snd_rawmidi_info_t)
#define SND_RAWMIDI_IOCTL_CHANNEL_PARAMS _IOW ('W', 0x10, snd_rawmidi_params_t)
#define SND_RAWMIDI_IOCTL_CHANNEL_STATUS _IOWR('W', 0x20, snd_rawmidi_status_t)
#define SND_RAWMIDI_IOCTL_CHANNEL_DRAIN	_IOW ('W', 0x30, int)
#define SND_RAWMIDI_IOCTL_CHANNEL_FLUSH _IOW ('W', 0x31, int)

/*
 *  Timer section - /dev/snd/timer
 */

#define SND_TIMER_VERSION		SND_PROTOCOL_VERSION(1, 0, 0)

#define SND_TIMER_TYPE_GLOBAL		(0<<28)
#define SND_TIMER_TYPE_SOUNDCARD	(1<<28)
#define SND_TIMER_TYPE_PCM		(2<<28)
#define SND_TIMER_TYPE_MAX		(7<<28)

/* type */
#define SND_TIMER_TYPE(tmr)		(((tmr) >> 28) & 0x3f)
/* global number */
#define SND_TIMER_GLOBAL_MAX		0x000003ff
#define SND_TIMER_GLOBAL(tmr)		((tmr) & SND_TIMER_GLOBAL_MAX)
#define SND_TIMER_GLOBAL_SYSTEM		0	/* system timer number */
/* soundcard number */
#define SND_TIMER_SOUNDCARD_CARD_MAX	(SND_CARDS-1)
#define SND_TIMER_SOUNDCARD_CARD_SHIFT	22
#define SND_TIMER_SOUNDCARD_CARD(tmr)	(((tmr) >> SND_TIMER_SOUNDCARD_CARD_SHIFT) & SND_TIMER_SOUNDCARD_CARD_MAX)
#define SND_TIMER_SOUNDCARD_DEV_MAX	0x003fffff
#define SND_TIMER_SOUNDCARD_DEV(tmr)	((tmr) & SND_TIMER_SOUNDCARD_DEV_MAX)
#define SND_TIMER_SOUNDCARD(card,dev)	(SND_TIMER_TYPE_SOUNDCARD|(((card)&SND_TIMER_SOUNDCARD_CARD_MAX)<<SND_TIMER_SOUNDCARD_CARD_SHIFT)|((dev)&SND_